ROTOR BLADE DETACHMENT DEVICE AND ROTOR BLADE DETACHMENT METHOD

Description

BACKGROUND OF THE INVENTION

Field of the Invention

The present disclosure relates to a rotor blade detachment device and a rotor blade detachment method.

Priority is claimed on Japanese Patent Application No. 2024-109828, filed on Jul. 8, 2024, the content of which is incorporated herein by reference.

Description of Related Art

An axial flow compressor, which is a type of axial flow rotary machine, includes a rotor that rotates about an axis line and a casing that covers the rotor. The rotor has a rotor shaft and a plurality of rotor blade rows attached to the rotor shaft. Each rotor blade row is arranged in an axial direction in which the axis line extends. Each of all the rotor blade rows has a disk and a plurality of rotor blades that are arranged on an outer peripheral surface of the disk in a circumferential direction with respect to the axis line.

The following Patent Document 1 discloses an axial flow compressor. A rotor shaft of the axial flow compressor has a disk for each of a plurality of rotor blade rows. All of the plurality of disks form a disk shape about an axis line. The rotor shaft is configured such that the plurality of disks are laminated in an axial direction. Each disk has an outer peripheral surface, a leading end surface, a trailing end surface, and a plurality of root grooves. The leading end surface extends from an edge of the outer peripheral surface on an axis line upstream-side to a radial inner side of the axis line. The trailing end surface extends from an edge of the outer peripheral surface on an axis line downstream-side to the radial inner side. All of the plurality of root grooves are recessed from the outer peripheral surface toward the radial inner side and extend from the trailing end surface toward a twisted direction with respect to the axial direction to penetrate the leading end surface. All of a plurality of rotor blades have a blade body extending in a radial direction and a blade root that is provided on the radial inner side of the blade body and is fitted into the root groove.

Patent Document 1 further discloses a rotor blade detachment device that detaches the rotor blade attached to the disk. The rotor blade detachment device includes an extrusion mechanism and a frame to which the extrusion mechanism is attached. This frame has two bases and a base coupling portion. The extrusion mechanism and the base coupling portion are disposed on the axis line downstream-side of the rotor blade. The two bases are disposed such that one rotor blade is located between the two bases. In addition, in this state, the extrusion mechanism is contactable with one rotor blade located between the two bases from the axis line downstream-side.

In the rotor blade detachment device in Patent Document 1, an operator drives the extrusion mechanism to push and move the rotor blade to the axis line upstream-side.

CITATION LIST

Patent Document

Patent Document 1: Japanese Unexamined Patent Application, First Publication No. 2022-181354

SUMMARY OF THE INVENTION

Meanwhile, in the detachment device for the rotor blade described in Patent Document 1, it is necessary to dispose the extrusion mechanism on the axis line downstream-side of the disk. Further, the extrusion mechanism is disposed to be lowered from above in a vertical direction. Therefore, it is necessary to open a casing of the axial flow compressor by detaching and opening an upper half portion of the casing of an axial flow rotary machine. The opening of the casing has a large effect, such as increasing the number of steps of an inspection process, and thus a technology for shortening the inspection process by not opening the casing is required.

Therefore, an object of the present disclosure is to provide a rotor blade detachment device and a rotor blade detachment method capable of detaching a rotor blade from a disk without opening a casing.

In order to solve the problem described above, according to an aspect of the present disclosure, there is provided a rotor blade detachment device that detaches a rotor blade from a disk, in which the disk has an outer peripheral surface that extends in a circumferential direction about an axis line, a first end surface that faces a first axis line side of both sides in an axial direction in which the axis line extends, a second end surface that faces a second axis line side opposite to the first axis line side, and a root groove, the root groove is recessed from the outer peripheral surface toward a radial inner side in a radial direction of the axis line, and penetrates from the second end surface to the first end surface, the rotor blade has a blade body that has a cross-section in a blade shape perpendicular to the radial direction, and extends in the radial direction, and a blade root that is provided on the radial inner side of the blade body, and is fitted into the root groove in a state of being inserted from the first axis line side toward the second axis line side, the rotor blade detachment device includes: a hook that is contactable with the rotor blade; and a drawing portion that is connected to the hook, and is configured to move the hook in a drawing direction from the second end surface toward the first end surface, the hook has a contact portion that is contactable with the rotor blade from the second axis line side in the axial direction, and an arm that extends from the contact portion in the drawing direction, and the drawing portion is connected to the arm at a position opposite to the contact portion in the drawing direction, and is configured to apply a load to the hook in the drawing direction.

According to an aspect of the present disclosure, there is provided a rotor blade detachment method of detaching a rotor blade from a disk, in which the disk has an outer peripheral surface that extends in a circumferential direction about an axis line, a first end surface that faces a first axis line side of both sides in an axial direction in which the axis line extends, a second end surface that faces a second axis line side opposite to the first axis line side, and a root groove, the root groove is recessed from the outer peripheral surface toward a radial inner side in a radial direction of the axis line, and penetrates from the second end surface to the first end surface, the rotor blade has a blade body that has a cross-section in a blade shape perpendicular to the radial direction, and extends in the radial direction, and a blade root that is provided on the radial inner side of the blade body, and is fitted into the root groove in a state of being inserted from the first axis line side toward the second axis line side, the rotor blade detachment method includes: a preparation step of preparing a rotor blade detachment device; a device disposition step of disposing the rotor blade detachment device at the disk; and a rotor blade movement step of moving the rotor blade attached to the disk by operating the rotor blade detachment device, the rotor blade detachment device prepared in the preparation step includes a hook that is contactable with the rotor blade, and a drawing portion that is connected to the hook, and is configured to move the hook in a drawing direction from the second end surface toward the first end surface, the hook has a contact portion that is contactable with the rotor blade from the second axis line side in the axial direction, and an arm that extends from the contact portion in the drawing direction, the drawing portion is connected to the arm at a position opposite to the contact portion in the drawing direction, and is configured to apply a load to the hook in the drawing direction, in the device disposition step, the hook is brought into contact with the rotor blade from the second axis line side in the axial direction, and the drawing portion is disposed on the first axis line side with respect to the rotor blade, and in the rotor blade movement step, the rotor blade is moved in the drawing direction by applying the load to the drawing portion.

With a rotor blade detachment device and a rotor blade detachment method of the present disclosure, a rotor blade can be detached from a disk without opening a casing.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic cross-sectional view of a gas turbine according to an embodiment of the present disclosure.

FIG. 2 is a detailed view of a rotor blade in a portion II in FIG. 1.

FIG. 3 is a view taken along a line III in FIG. 2.

FIG. 4 is a main portion perspective view of a rotor according to the embodiment of the present disclosure.

FIG. 5 is a plan view of a rotor blade detachment device according to a first embodiment of the present disclosure.

FIG. 6 is a flowchart showing a procedure of a rotor blade detachment method according to the first embodiment of the present disclosure.

FIG. 7 is a plan view of a main portion of the rotor and the rotor blade detachment device after a device disposition step according to the first embodiment of the present disclosure.

FIG. 8 is a plan view of a rotor blade detachment device according to a second embodiment of the present disclosure.

FIG. 9 is a flowchart showing a procedure of a rotor blade detachment method according to the second embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings.

Axial Flow Rotary Machine

First, a description of an axial flow rotary machine to which a rotor blade detachment device and a rotor blade detachment method are applied will be made with reference to FIGS. 1 to 4.

The axial flow rotary machine to which the rotor blade detachment device and the rotor blade detachment method are applied is a turbine of a gas turbine. As shown in FIG. 1, a gas turbine 1 includes a compressor 30 that compresses air A, a combustor 20 that burns fuel F in the air A compressed by the compressor 30 to generate combustion gas, and a turbine 10 that is driven by the combustion gas.

The compressor 30 has a compressor rotor 31 that rotates about an axis line Ar, a compressor casing 35 that covers the compressor rotor 31, and a plurality of stator blade rows 37. The turbine 10 has a turbine rotor 11 that rotates about the axis line Ar, a turbine casing 15 that covers the turbine rotor 11, and a plurality of stator blade rows 17. Here, a direction in which the axis line Ar extends is referred to as an axial direction Da, a circumferential direction about the axis line Ar is simply referred to as a circumferential direction Dc, and a direction perpendicular to the axis line Ar is referred to as a radial direction Dr. In addition, one side of both sides in the axial direction Da is referred to as a first axis line side Dau (axis line upstream-side), and the other side is referred to as a second axis line side Dad (axis line downstream-side). Further, a side approaching the axis line Ar in the radial direction Dr is referred to as a radial inner side Dri, and a side opposite to the radial inner side Dri is referred to as a radial outer side Dro.

The compressor 30 is disposed on the axis line upstream-side Dau of the turbine 10. The compressor rotor 31 and the turbine rotor 11 are located on the same axis line Ar and are connected to each other to form the gas turbine rotor 2. For example, a rotor of a generator GEN is connected to the gas turbine rotor 2. The gas turbine 1 further includes an intermediate casing 6. The intermediate casing 6 is disposed between the compressor casing 35 and the turbine casing 15 in the axial direction Da.

The combustor 20 is attached to the intermediate casing 6. The compressor casing 35, the intermediate casing 6, and the turbine casing 15 are connected to each other to form the gas turbine casing 5.

The turbine rotor 11 has a rotor shaft 12 that extends in the axial direction Da with the axis line Ar as a center, and a plurality of rotor blade rows 13 attached to the rotor shaft 12. The plurality of rotor blade rows 13 are arranged in the axial direction Da. Each of all the rotor blade rows 13 is configured with a plurality of rotor blades arranged in the circumferential direction Dc. Any one stator blade row 17 among the plurality of stator blade rows 17 is disposed on each axis line upstream-side Dau of the plurality of rotor blade rows 13. Each of the stator blade rows 17 is provided inside the turbine casing 15. Each of all the stator blade rows 17 is configured with a plurality of stator blades arranged in the circumferential direction Dc.

The compressor rotor 31 has a rotor shaft 32 that extends in the axial direction Da with the axis line Ar as a center, and a plurality of rotor blade rows 33 attached to the rotor shaft 32. The plurality of rotor blade rows 33 are arranged in the axial direction Da. Each of all the rotor blade rows 33 is configured with a plurality of rotor blades arranged in the circumferential direction Dc. Any one stator blade row 37 among the plurality of stator blade rows 37 is disposed on each axis line downstream-side Dad of the plurality of rotor blade rows 33. Each of the stator blade rows 37 is provided inside the compressor casing 35. Each of all the stator blade rows 37 is configured with a plurality of stator blades arranged in the circumferential direction Dc.

The rotor shaft 12 of the turbine 10 has a disk 40 for each of the plurality of rotor blade rows 13. As shown in FIGS. 2 and 3, all of a plurality of disks 40 form a disk shape about the axis line Ar. The rotor shaft 12 is configured such that the plurality of disks 40 are laminated in the axial direction Da. All of a plurality of rotor blades 50 constituting the rotor blade row 13 have a blade body 51 that extends in the radial direction Dr and has a cross-section in a blade shape perpendicular to the radial direction Dr and a blade root 52 provided on the radial inner side Dri of the blade body 51.

The blade body 51 has a blade surface 51s connected by a leading edge 51f and a trailing edge 51b. The leading edge 51f is an outer edge of the blade body 51 that is located closest to the axis line upstream-side Dau in the axial direction Da in the blade body 51. The trailing edge 51b is an outer edge of the blade body 51 that is located closest to the axis line downstream-side Dad in the axial direction Da in the blade body 51. Both the leading edge 51f and the trailing edge 51b extend in the radial direction Dr.

The blade root 52 has a blade root leading end surface 53f facing the axis line upstream-side Dau, a blade root trailing end surface 53b facing the axis line downstream-side Dad, and a blade root side surface 54 connected by the blade root leading end surface 53f and the blade root trailing end surface 53b. In FIGS. 2 and 3, among the plurality of rotor blade rows 13, a first stage rotor blade row 13f on the axis line upstream-side Dau, a first stage disk 40f to which the first stage rotor blade row 13f is attached, a second stage rotor blade row 13s adjacent to the first stage rotor blade row 13f on the axis line downstream-side Dad, and a second stage disk 40s to which the second stage rotor blade row 13s is attached are shown.

The disk 40 having a disk shape has a disk-shaped body portion 41 centered on the axis line Ar and a rotor blade attachment portion 43 formed at an outer periphery of the body portion 41. The body portion 41 has an inner leading end surface 42f facing the axis line upstream-side Dau and an inner trailing end surface 42b facing the axis line downstream-side Dad. The inner trailing end surface 42b faces the inner leading end surface 42f. The inner trailing end surface 42b of the disk 40 is in contact with the inner leading end surface 42f of the other disk 40 adjacent to the disk 40 on the axis line downstream-side Dad. The rotor blade attachment portion 43 has an outer peripheral surface 44 that extends in the circumferential direction Dc about the axis line Ar, a first end surface 45f (outer leading end surface) that faces the axis line upstream-side Dau, a second end surface 45b (outer trailing end surface) that faces the axis line downstream-side Dad, and a root groove 46. The outer leading end surface 45f extends from an edge of the outer peripheral surface 44 on the axis line upstream-side Dau toward the radial inner side Dri. The outer leading end surface 45f is located on the axis line downstream-side Dad of the inner leading end surface 42f. The outer trailing end surface 45b extends an edge of the outer peripheral surface 44 on the axis line downstream-side Dad toward the radial inner side Dri. The outer trailing end surface 45b is located on the axis line upstream-side Dau of the inner trailing end surface 42b. Thus, a distance between the outer leading end surface 45f and the outer trailing end surface 45b in the axial direction Da is less than the distance between the inner leading end surface 42f and the inner trailing end surface 42b in the axial direction Da.

As shown in FIG. 4, the root groove 46 is recessed from the outer peripheral surface 44 toward the radial inner side Dri. The root groove 46 extends in a groove-through direction Dm that is inclined with respect to the axis line Ar and intersects the axis line Ar, and penetrates the rotor blade attachment portion 43. Therefore, the root groove 46 has a trailing end opening 47b that is open at the outer trailing end surface 45b and a leading end opening 47f that is open at the outer leading end surface 45f. The blade root 52 of the rotor blade 50 is fitted into the root groove 46. The root groove 46 extends in the groove-through direction Dm that is inclined with respect to the axis line Ar and intersects the axis line Ar in the present embodiment, but the present invention is not limited thereto. That is, the root groove 46 may extend in a direction parallel to the axial direction Da as the groove-through direction Dm. In other words, the axial direction Da and the groove-through direction Dm may not be parallel to each other or may be parallel to each other.

Here, between both sides in the groove-through direction Dm, a direction from the first end surface 45f toward the second end surface 45b is referred to as an inserting direction Dm1, and a direction from the second end surface 45b toward the first end surface 45f is referred to as a drawing direction Dm2. In other words, a direction in which the rotor blade 50 is inserted is referred to as an inserting direction Dm1, and a direction in which the rotor blade 50 is drawn is referred to as the drawing direction Dm2.

First Embodiment of Rotor Blade Detachment Device

A rotor blade detachment device 60 according to the present embodiment will be described with reference to FIG. 5.

The rotor blade detachment device 60 is used in a case of detaching the rotor blade 50 fixed to the disk 40 in a state in which the blade root 52 is inserted into the root groove 46. The rotor blade detachment device 60 can move the rotor blade 50 in the drawing direction Dm2 of the disk 40 to draw the rotor blade 50 from the disk 40. As shown in FIG. 5, the rotor blade detachment device 60 according to the present embodiment includes a hook 70 and a drawing portion 80.

Hook

The hook 70 is a member configured to be contacted with the rotor blade 50. In the present embodiment, only the hook 70 is contactable with the rotor blade 50. The hook 70 includes a contact portion 71, an arm 76, a base 77, and a support portion 78. Here, in the rotor blade detachment device 60 of the present embodiment, the groove-through direction Dm is a direction in which the arm 76 extends. The drawing direction Dm2 is a direction from the contact portion 71 toward the drawing portion 80 in the groove-through direction Dm. In addition, the inserting direction Dm1 is the groove-through direction Dm and is a direction from the drawing portion 80 toward the contact portion 71. In addition, a direction perpendicular to the groove-through direction Dm and in which the contact portion 71 extends is referred to as a width direction Dw.

Contact Portion

The contact portion 71 is a member configured to be contacted with the rotor blade 50 from the second axis line side Dad in the axial direction Da. The contact portion 71 of the present embodiment includes a contact portion main body 72, a first projecting portion 73, a locking portion 74, and a second projecting portion 75.

The contact portion main body 72 extends in a direction including the width direction Dw. The direction including the width direction Dw may be a direction coinciding with the width direction Dw or may be a direction intersecting the width direction Dw on the same virtual plane. The contact portion main body 72 of the present embodiment extends parallel to the blade root trailing end surface 53b, for example, to intersect with the width direction Dw. The contact portion main body 72 is formed in a rod shape that extends in a linear shape. The contact portion main body 72 is disposed on the axis line downstream-side Dad of the rotor blade 50 in a case where the rotor blade detachment device 60 is in a state of detaching the rotor blade 50 from the disk 40.

The first projecting portion 73 extends in the drawing direction Dm2 with respect to the contact portion main body 72. The first projecting portion 73 is contactable with the rotor blade 50 from the second axis line side Dad. The first projecting portion 73 is contactable with, for example, the blade root trailing end surface 53b. In the contact portion 71 of the present embodiment, only the first projecting portion 73 is contactable with the blade root trailing end surface 53b. The first projecting portion 73 is disposed at a position separated from an end portion of the contact portion main body 72 in the width direction Dw.

The locking portion 74 is connected to the end portion of the contact portion main body 72 in the width direction Dw. The locking portion 74 extends from the contact portion main body 72 in the drawing direction Dm2. The locking portion 74 extends in the radial direction Dr longer than the first projecting portion 73 with respect to the contact portion main body 72. The locking portion 74 is formed in a rod shape that extends in a linear shape in the drawing direction Dm2. In a case where the rotor blade detachment device 60 is in a state of detaching the rotor blade 50 from the disk 40, the locking portion 74 is disposed on one side of the rotor blade 50 in the width direction Dw. The locking portion 74 is disposed at a position separated from the first projecting portion 73 in the width direction Dw.

The second projecting portion 75 extends in the width direction Dw with respect to the locking portion 74. The second projecting portion 75 is contactable with the blade root side surface 54 in the width direction Dw. In the present embodiment, only the second projecting portion 75 is contactable with the blade root side surface 54. The second projecting portion 75 is disposed at a position separated from the contact portion main body 72 in the drawing direction Dm2.

Arm

The arm 76 is a member for disposing the contact portion 71 at a position of the rotor blade 50, which is close to the second end surface 45b and disposing the drawing portion 80 at a position close to the first end surface 45f, as viewed from the radial direction Dr, in a state in which the hook 70 is brought into contact with the rotor blade 50 in a state in which the rotor blade 50 is to be detached from the disk 40 by the rotor blade detachment device 60. One end portion of the arm 76 in the groove-through direction Dm is connected to the contact portion 71. The arm 76 is disposed at a position separated from the locking portion 74 in the width direction Dw. That is, the arm 76 is connected to the contact portion 71 at an end portion on a side opposite to the locking portion 74 in the width direction Dw. The arm 76 extends from the contact portion 71 in the drawing direction Dm2. The other end portion of the arm 76 in the groove-through direction Dm is connected to the base 77. The arm 76 is formed in a rod shape that extends in a linear shape in the drawing direction Dm2. The arm 76 is formed to be longer than the locking portion 74 in the drawing direction Dm2. The arm 76 is formed longer than the rotor blade 50 in the groove-through direction Dm or the axial direction Da as viewed from the radial direction Dr in a state in which the hook 70 is in contact with the rotor blade 50.

Base

The base 77 is a member that connects the hook 70 and the drawing portion 80. The base 77 is connected to the arm 76 at a position opposite to the contact portion 71 in the drawing direction Dm2. The base 77 is connected to an end portion of the arm 76. The base 77 extends in a direction perpendicular to the drawing direction Dm2. That is, the base 77 of the present embodiment extends from the arm 76 to both sides in the width direction Dw. That is, the arm 76 is connected to the middle of the base 77 in the width direction Dw. The base 77 is formed to be longer than the contact portion main body 72 as viewed in the radial direction Dr in a state in which the hook 70 is in contact with the rotor blade 50. The base 77 is disposed at a position separated from the rotor blade 50 in the drawing direction Dm2 in a state in which the hook 70 is in contact with the rotor blade 50. The base 77 includes a screw hole 77a formed by penetrating the base 77 in a screw-through direction Ds inclined with respect to the groove-through direction Dm. That is, the screw hole 77a is formed to extend in a direction inclined with respect to the arm 76. A female screw is formed at an inner peripheral surface of the screw hole 77a. The screw-through direction Ds extends in a direction that is inclined with respect to the groove-through direction Dm in the present embodiment, but the present invention is not limited thereto. That is, the screw-through direction Ds may be parallel to or may not be parallel to the groove-through direction Dm.

Support Portion

The support portion 78 is a member configured to support the rotor blade 50 in a state in which the rotor blade 50 is not movable in the drawing direction Dm2, together with the contact portion 71. The support portion 78 is contactable with the rotor blade 50 from the first axis line side Dau. By being moved at the base 77 to approach the contact portion 71, the support portion 78 supports the rotor blade 50 by pressing the rotor blade 50 against the contact portion 71 and sandwiching the rotor blade 50 with the contact portion 71. The support portion 78 of the present embodiment has a screw shaft 78a and a screw head portion 78b.

The screw shaft 78a is insertable into the screw hole 77a. The screw shaft 78a is movable at the base 77 in a state of being inserted into the screw hole 77a. The screw shaft 78a extends in a linear shape. A male screw that is screwed with the female screw of the screw hole 77a is formed at an outer peripheral surface of the screw shaft 78a. A tip of the screw shaft 78a is contactable with the blade root leading end surface 53f of the rotor blade 50.

The support portion 78 further includes the screw head portion 78b at a position opposite to the contact portion 71 in the screw-through direction Ds.

The screw head portion 78b suppresses the screw shaft 78a from falling off from the screw hole in a case where the screw shaft 78a is moved to approach the contact portion 71. The screw head portion 78b is connected to an end portion of the screw shaft 78a in the screw-through direction Ds. The screw head portion 78b is disposed on a side opposite to the contact portion 71 and the arm 76 with a base interposed therebetween in a state in which the screw shaft 78a is inserted into the screw hole. The screw head portion 78b extends concentrically with the screw shaft 78a in the radial direction Dr of the screw-through direction Ds. An outer diameter of the screw head portion 78b is larger than an outer diameter of the screw shaft 78a. A cross-sectional shape of the screw head portion 78b in the screw-through direction Ds is not limited to a circular shape. For example, the shape may be a quadrangle shape or a hexagon shape.

Drawing Portion

The drawing portion 80 is a member that moves the hook 70 in the drawing direction Dm2. The drawing portion 80 is connected to the hook 70. The drawing portion 80 is connected to the arm 76 at a position opposite to the contact portion 71 in the drawing direction Dm2. The drawing portion 80 can apply a load to the hook 70 in the drawing direction Dm2. The drawing portion 80 is attachable to and detachable from the hook 70. The drawing portion 80 of the present embodiment is indirectly connected to the arm 76 via the base 77. The drawing portion 80 includes a first frame 81 and a second frame 82.

First Frame

The first frame 81 is a member that extends to extend the arm 76 in the drawing direction Dm2. The first frame 81 extends in the drawing direction Dm2. The first frame 81 is formed in a rod shape that extends in a linear shape in the drawing direction Dm2. The first frame 81 is formed to be longer than the arm 76 in the drawing direction Dm2. A pair of first frames 81 are disposed to be separated from each other in the width direction Dw. The pair of first frames 81 is connected to both ends of the base 77 in the width direction Dw. The first frame 81 is attachably and detachably fixed to an end portion of the base 77 via a bolt (not shown).

Second Frame

The second frame 82 is a member to which a load can be applied in the drawing portion 80. The second frame 82 is connected to the first frame 81 at a position opposite to the hook 70 in the drawing direction Dm2. The second frame 82 extends in a direction perpendicular to the drawing direction Dm2 with respect to the first frame 81. That is, the second frame 82 extends in the width direction Dw with respect to the first frame 81. The second frame 82 is formed in a rod shape that extends in a linear shape in the width direction Dw. The second frame 82 is disposed at a position separated from the base 77 in the drawing direction Dm2. The second frame 82 is connected to an end portion of the first frame 81, which is opposite to an end portion connected to the base 77. The second frame 82 connects the pair of first frames 81. The second frame 82 is attachably and detachably fixed to the pair of first frames 81 via bolts. A chipping hammer 90 is contactable to the second frame 82. The chipping hammer 90 is disposed at the second frame 82 to apply an impact from the base 77 toward the second frame 82 in the drawing direction Dm2 in a state of being disposed between the pair of first frames 81 in the width direction Dw. That is, the load can be applied to the second frame 82 in the drawing direction Dm2 by the chipping hammer 90.

The chipping hammer 90 is not limited to the driving method. For example, the driving method may have a hydraulic type or an electric type.

In addition, in the present embodiment, lengths of the base 77 and the second frame 82 in the width direction Dw are formed to be more than a length of the contact portion 71 in the direction including the width direction Dw. Here, for convenience, all of these lengths are set to a width orthogonal to the drawing direction Dm2.

In addition, the length of the second frame 82 is formed to be more than the length of the base 77 in a direction perpendicular to both the drawing direction Dm2 and the width direction Dw. That is, the length of the second frame 82 is formed to be more than the length of the contact portion 71 in a direction perpendicular to both the drawing direction Dm2 and the width direction Dw.

Embodiment of Rotor Blade Detachment Method

A rotor blade detachment method S10 in the present embodiment will be described with reference to a flowchart shown in FIG. 6.

The rotor blade detachment method S10 is a method of drawing and detaching the rotor blade 50 from the disk 40 by the rotor blade detachment device 60. In the rotor blade detachment method S10, the rotor blade 50 is detached without detaching an upper half of the turbine casing 15. The rotor blade detachment method S10 in the present embodiment includes a preparation step S1, a disk rotation step S2, a device disposition step S3, and a rotor blade movement step S4. Here, an example of detaching one rotor blade 50 from the first stage disk 40f will be described.

First, the preparation step S1 is executed. In the preparation step S1, the rotor blade detachment device 60 described above is prepared.

After executing the preparation step S1, the disk rotation step S2 is executed. In the disk rotation step S2, as shown in FIG. 4, the disk 40 is rotated about the axis line Ar. In this case, the disk 40 is rotated such that an entire rotor blade 50a to be detached is located above the axis line Ar in a vertical direction. In a case where the entire rotor blade 50a to be detached is already located above the axis line Ar in the vertical direction, it is not necessary to rotate the disk 40. That is, the disk rotation step S2 may be omitted.

After executing the disk rotation step S2, the device disposition step S3 is executed. In the device disposition step S3, as shown in FIG. 7, the rotor blade detachment device 60 is disposed at the first stage disk 40f. Specifically, the device disposition step S3 includes a hook disposition step S31 and a support portion disposition step S32.

First, the hook disposition step S31 is executed. The hook 70 is moved along the blade root side surface 54 in the inserting direction Dm1 while not coming into contact with the rotor blade 50. In a case where it is difficult to move the hook 70 without coming into contact with the rotor blade 50, one rotor blade 50 adjacent to a side of the rotor blade 50a to be detached into which the hook 70 is inserted in the circumferential direction Dc may be detached in advance, among the plurality of rotor blades 50 arranged in an annular shape. The rotor blade detachment device 60 is disposed such that the drawing portion 80 is located on the first axis line side Dau in the axial direction Da while the hook 70 is in contact with the rotor blade 50a to be detached from the axial direction Da in the second axis line side Dad. Here, a portion of the hook 70, which comes into contact with the rotor blade 50a to be detached is the contact portion 71, and more specifically, the first projecting portion 73. The first projecting portion 73 is in contact with a trailing end of the rotor blade 50. In addition, in a state in which the first projecting portion 73 is in contact with the trailing end of the rotor blade 50, the blade root side surface 54 of the rotor blade 50a to be detached is in contact with the second projecting portion 75 from the width direction Dw. In a state in which the first projecting portion 73 and the second projecting portion 75 are in contact with the rotor blade 50, the groove-through direction Dm and the extending direction of the arm 76 are parallel to each other. Therefore, the hook 70 is disposed at a position at which the rotor blade 50a to be detached can be detached.

After the hook disposition step S31 is executed, the support portion disposition step S32 is executed. After the drawing portion 80 is located on the first axis line side Dau of the rotor blade 50 in the axial direction Da while the first projecting portion 73 and the second projecting portion 75 are in contact with the rotor blade 50, the support portion 78 in which the screw shaft 78a is screwed into the screw hole 77a is rotated, so that the support portion 78 is moved to approach the rotor blade 50a to be detached in the screw-through direction Ds. The support portion 78 is moved until the tip of the screw shaft 78a comes into contact with the blade root leading end surface 53f of the rotor blade 50a to be detached. The tip of the screw shaft 78a is in contact with the rotor blade 50 in a state in which a load is applied to press against the rotor blade 50 toward the first projecting portion 73. Therefore, the rotor blade 50a to be detached is supported in a state in which the rotor blade 50a cannot be moved in the groove-through direction Dm by the first projecting portion 73 and the tip of the screw shaft 78a. Further, in the present embodiment, the second projecting portion 75 also comes into contact with the rotor blade 50, in addition to the first projecting portion 73 and the tip of the screw shaft 78a. That is, the rotor blade 50a to be detached is in contact with the rotor blade detachment device 60 at three points of the first projecting portion 73, the second projecting portion 75, and the tip of the screw shaft 78a. Therefore, the rotor blade 50 is supported in a state in which the rotor blade 50 cannot move not only in the groove-through direction Dm but also in the circumferential direction Dc. Therefore, the support portion 78 is disposed at a position at which the rotor blade 50a to be detached is not movable.

In addition, in the device disposition step S3, a falling prevention process on the rotor blade 50 or the rotor blade detachment device 60 may be performed before and after the above hook disposition step S31 and support portion disposition step S32 are executed, as necessary.

After executing the device disposition step S3, the rotor blade movement step S4 is executed. The rotor blade movement step S4 includes a movement step S5 and a determination step S6.

In the movement step S5, the chipping hammer 90 applies a load to the second frame 82 in the drawing direction Dm2, so that the rotor blade 50a to be detached is moved in the drawing direction Dm2 and is drawn from the disk 40. Specifically, first, the chipping hammer 90 is disposed in contact with the second frame 82 in a state of being disposed between the pair of first frames 81 in the width direction Dw. The chipping hammer 90 is disposed at the second frame 82 to apply a load by applying an impact in the drawing direction Dm2. After the chipping hammer 90 is disposed, the chipping hammer 90 is driven, and the load is applied to the second frame 82 in the drawing direction Dm2.

In the determination step S6, it is determined whether or not the blade root 52 of the rotor blade 50a to be detached comes out of the root groove 46 as a result of the execution of the movement step S5. Here, in a case where it is determined that the blade root 52 of the rotor blade 50a to be detached does not come out of the root groove 46, the movement step S5 is executed again.

As described above, until it is determined in the determination step S6 that the blade root 52 of the rotor blade 50a to be detached comes out of the root groove 46, the movement step S5 and the determination step S6 are repeatedly executed.

Operation and Effects

According to the rotor blade detachment device 60 and rotor blade detachment method S10 described above, the hook 70 is in contact with the rotor blade 50 from the second axis line side Dad in the axial direction Da. Specifically, in the hook disposition step S31, the first projecting portion 73 is in contact with the blade root trailing end surface 53b of the rotor blade 50, which is located on the second axis line side Dad. Further, the second projecting portion 75 is in contact with the blade root side surface 54. In this state, in the axial direction Da, the drawing portion 80 is disposed at a position opposite to the hook 70 with respect to the rotor blade 50. Thereafter, in the rotor blade movement step S4, a load is applied to the drawing portion 80 in the drawing direction Dm2 by the chipping hammer 90. Therefore, the load is applied to the drawing portion 80 in the drawing direction Dm2 in a state in which the hook 70 is in contact with the rotor blade 50, so that the rotor blade 50 is detached by being drawn in the drawing direction Dm2. Therefore, according to the present embodiment, the rotor blade 50 can be detached from the disk 40 by being drawn.

In addition, according to such a structure, an operator from the first axis line side Dau of the axial direction Da with respect to the rotor blade 50 can bring the hook 70 into contact with the rotor blade 50 from the second axis line side Dad or apply a load in the drawing direction Dm2 to the drawing portion 80. Therefore, the operator can access the rotor blade 50 from the first axis line side Dau in the axial direction Da to detach the rotor blade 50. Therefore, even in a case where the operator cannot directly access the rotor blades 50 spaced apart from each other in the axial direction Da, the rotor blades 50 can be detached without detaching an upper half portion of a casing and opening the casing. Accordingly, with the rotor blade detachment device 60 and the rotor blade detachment method S10 according to the present embodiment, it is possible to detach the rotor blade 50 without opening the casing.

In addition, in a state in which the rotor blade detachment device 60 is attached to the rotor blade 50, that is, in a state in which the hook disposition step S31 is executed, the hook 70 is fitted to the rotor blade 50. Specifically, the first projecting portion 73 and the blade root trailing end surface 53b are in contact with each other and the second projecting portion 75 and the blade root side surface 54 are in contact with each other, so that the hook 70 is fitted to the rotor blade 50. In other words, the rotor blade 50 is supported by the rotor blade detachment device 60 in the groove-through direction Dm and the circumferential direction Dc. Therefore, the movement of the rotor blade 50 in the groove-through direction Dm and the circumferential direction Dc is restricted. Therefore, according to the present embodiment, the rotor blade 50 is detached by being drawn from the disk 40 in a state in which the rotor blade 50, particularly a shape of the blade body 51, is unlikely to be damaged. In addition, since the rotor blade 50 is supported, the load is stably applied to the rotor blade 50 in the drawing direction Dm2. Therefore, according to the present embodiment, the rotor blade 50 can be easily detached from the disk 40.

According to the present embodiment, the rotor blade 50 is further supported by the support portion 78. Specifically, the rotor blade 50 comes into contact with the tip of the screw shaft 78a from the first axis line side Dau in the axial direction Da. In a state in which the rotor blade detachment device 60 is attached to the rotor blade 50, the rotor blade 50 comes into contact with the first projecting portion 73 from the second axis line side Dad and the tip of the screw shaft 78a from the first axis line side Dau in the axial direction Da. Thus, the rotor blade 50 is supported in a state of being not movable in the drawing direction Dm2. As described above, since the rotor blade 50 is in contact with the second projecting portion 75, according to the present embodiment, the rotor blade 50 is supported at three points by the rotor blade detachment device 60, and is more stably supported. Thus, the rotor blade 50 can be drawn and detached from the disk 40 in a state in which the rotor blade 50, particularly the shape of the blade body 51, is less likely to be damaged. In addition, since the rotor blade 50 is supported in a more stable state by the three-point support, the rotor blade 50 can be detached more easily.

In the present embodiment, the hook 70 has the base 77 that is connected to the arm 76 at a position opposite to the contact portion 71 in the drawing direction Dm2 and extends in a direction perpendicular to the drawing direction Dm2. The support portion 78 is moved with respect to the base 77 to approach the hook 70, specifically, the contact portion 71. When the rotor blade detachment device 60 is disposed with respect to the rotor blade 50 in this manner, the rotor blade 50 is supported by being sandwiched by the support portion 78 such that the rotor blade 50 is pressed toward the contact portion 71. In other words, the rotor blade 50 is pressed in a direction including the inserting direction Dm1 by the support portion 78, and is supported by the support portion 78 and the contact portion 71 sandwiching the rotor blade 50. The direction including the inserting direction Dm1 may be a direction coinciding with the inserting direction Dm1 or may be a direction intersecting the inserting direction Dm1 on the same virtual plane. As described above, the rotor blade 50 is supported by being sandwiched between the support portion 78 and the contact portion 71, and thus is more stably supported. Thus, the detachment of the rotor blade 50 from the disk 40 can be performed more easily.

Further, in the present embodiment, a female screw is formed at an inner peripheral surface of the base 77, and the screw hole 77a penetrating the base 77 in the screw-through direction Ds is formed. A male screw that is screwed with the female screw of the screw hole 77a is formed at an outer peripheral surface of the screw shaft 78a. When the screw shaft 78a is inserted into the screw hole 77a, the support portion 78 is rotated, and thus the support portion 78 is moved in the screw-through direction Ds. Therefore, the tip of the screw shaft 78a can be brought into contact with the rotor blade 50 from the first axis line side Dau in the axial direction Da. In addition, specifically, the tip of the screw shaft 78a is in contact with the rotor blade 50 at the blade root leading end surface 53f. Since the support portion 78 has a structure of being moved by the screw in this manner, it is possible to easily adjust the force with which the support portion 78 acts to press the rotor blade 50.

In the present embodiment, the drawing portion 80 can apply a load to the hook 70 in the drawing direction Dm2. This is because the second frame 82 extends in a direction perpendicular to the drawing direction Dm2, that is, parallel to the base 77, and the second frame 82 can be applied with the load toward the drawing direction Dm2. The first frame 81 is formed to be longer than the arm 76 in the drawing direction Dm2. Therefore, the second frame 82 can be disposed to be spaced apart from the rotor blade 50 in the axial direction Da in a state in which the rotor blade detachment device 60 is installed on the rotor blade 50. Therefore, it is easy for the operator to perform a step of applying a load in the drawing direction Dm2 to the second frame 82. In addition, since the pair of first frames 81 are disposed to be separated from each other in the width direction Dw of the base 77, the hook 70 is stably connected to the drawing portions 80. Thus, the load in the drawing direction Dm2 is stably applied to the hook 70. Accordingly, the rotor blade 50 can be stably and easily detached.

In addition, the lengths of the base 77 and the second frame 82 of the present embodiment in the width direction Dw are formed to be more than the length of the contact portion 71 in a direction including the width direction Dw. Since the contact portion 71 is provided to be fitted to the rotor blade 50, the length of the contact portion 71 in the direction including the width direction Dw is more than a thickness of the rotor blade 50 in the circumferential direction Dc, but is not significantly more than the thickness of the rotor blade 50. Since the lengths of the base 77 and the second frame 82 in the width direction Dw are formed to be more than the length of the contact portion 71 in the direction including the width direction Dw, the drawing portion 80 can be formed to have a size that is easy to handle.

In addition, the length of the second frame 82 is formed to be more than the length of the base 77 in a direction perpendicular to both the drawing direction Dm2 and the width direction Dw. That is, the length of the second frame 82 is formed to be more than the length of the contact portion 71 in a direction perpendicular to both the drawing direction Dm2 and the width direction Dw. In other words, a thickness of the second frame 82 is formed to be more than a thickness of the contact portion 71 in a direction perpendicular to both the drawing direction Dm2 and the width direction Dw. Accordingly, the second frame 82 can be configured such that a surface with which the chipping hammer 90 can come into contact extends. Therefore, it is possible to easily apply the load in the drawing direction Dm2 to the second frame 82 by the chipping hammer 90.

In addition, in the present embodiment, the drawing portion 80 is attachable to and detachable from the hook 70. Specifically, the first frame 81 is fixed to an end portion of the base 77 via a bolt, and the second frame 82 is fixed to the first frame 81 via a bolt at a position opposite to the hook 70 in the drawing direction Dm2. By being fixed via the bolts in this manner, each of the first frame 81 and the base 77, and the first frame 81 and the second frame 82 are attachably and detachably fixed. Since the drawing portion 80 is attachable to and detachable from the hook 70, the drawing portion 80 according to a different aspect from the present embodiment can also be used. An exemplary example of the different aspect of the drawing portion is a drawing portion 80a of a second embodiment described below. Thus, the drawing portion to be used can be appropriately changed depending on a use application or the like.

In the rotor blade detachment device 60 and the rotor blade detachment method S10 according to the present embodiment, a load applied to the second frame 82 can be applied in the drawing direction Dm2 by the chipping hammer 90. That is, the chipping hammer 90 applies the load for drawing and detaching the rotor blade 50 in the drawing direction Dm2 to the second frame 82. The rotor blade 50 is detached to be drawn in the drawing direction Dm2. Accordingly, in a state of detaching the rotor blade 50, the drawing portion 80 and the operator exist on the same side of the rotor blade 50 in the drawing direction Dm2. Therefore, it is easier to determine in the determination step S6 whether or not the blade root 52 of the rotor blade 50 comes out of the root groove 46. This also contributes to prevention of the falling off of the rotor blade 50. In addition, with the chipping hammer 90, it is possible to apply a load to the second frame 82 even in a narrow space. In addition, for example, by using the chipping hammer 90 that does not depend on human power, such as a hydraulic type or an electric type, it is possible to easily apply the load to the second frame 82.

Second Embodiment of Rotor Blade Detachment Device

Next, the second embodiment of the present disclosure will be described with reference to FIG. 8. In the second embodiment, the same components as those of the first embodiment are denoted by the same reference numerals and a detailed description thereof will be omitted.

A rotor blade detachment device 60a according to the second embodiment can move the rotor blade 50 in the drawing direction Dm2 with respect to the disk 40 to draw the rotor blade 50 from the disk 40. In the second embodiment, a structure of the drawing portion 80a is significantly different from the structure of the first embodiment. As shown in FIG. 8, the rotor blade detachment device 60a of the second embodiment includes the hook 70 and the drawing portion 80a. In the hook 70, only the base 77 has a partially different structure from the structure of the first embodiment.

The base 77 in the second embodiment further includes a coupling hole 77b for connection to the drawing portion 80a. A length of the coupling hole 77b is formed to be less than the length of the base 77 in the groove-through direction Dm. That is, the coupling hole 77b is formed not to penetrate the base 77 in the groove-through direction Dm. The coupling hole 77b is formed such that a central axis of the arm 76 and a central axis of the coupling hole 77b coincide with each other in an axis-through direction. A female screw is formed at an inner peripheral surface of the coupling hole 77b.

Drawing Portion

The drawing portion 80a of the second embodiment has a structure in which another member, such as the chipping hammer 90, that applies an impact is not separately required. That is, the drawing portion 80a can apply a load to the hook 70 in the drawing direction Dm2 alone. The drawing portion 80a of the second embodiment is a member that moves the hook 70 in the drawing direction Dm2, in the same manner as the drawing portion 80 of the first embodiment. The drawing portion 80a of the second embodiment includes a support column 83, an impact portion 84, and a hammer portion 85.

Support Column

The support column 83 is a member that extends to extend the arm 76 in the drawing direction Dm2. The support column 83 extends in the drawing direction Dm2. The support column 83 is formed in a rod shape that extends in a linear shape in the drawing direction Dm2. One end portion of the support column 83 in the drawing direction Dm2 can be inserted into the coupling hole 77b. A male screw that is screwed to a female screw of the coupling hole 77b is formed at the outer peripheral surface at one end portion of the support column 83 in the drawing direction Dm2. The support column 83 is attachably and detachably fixed to the base 77 in a state in which one end portion thereof in the drawing direction Dm2 is inserted into the coupling hole 77b. In addition, in this state, the support column 83 is fixed such that a central axis of the arm 76 and a central axis of the support column 83 coincide with each other in the axis-through direction.

Impact Portion

The impact portion 84 is a member with which a load can be applied by the drawing portion 80a. The impact portion 84 is contactable with the hammer portion 85 to be described below. The hammer portion 85 can apply a load to the impact portion 84 in the drawing direction Dm2. The impact portion 84 is connected to the support column 83 at an end portion opposite to the hook 70 in the drawing direction Dm2. In other words, the impact portion 84 is connected to the support column 83 at the other end portion of the support column 83 in the drawing direction Dm2. The impact portion 84 extends in a direction perpendicular to the drawing direction Dm2 with respect to the support column 83 to increase a diameter of the support column 83 in the drawing direction Dm2. That is, the impact portion 84 extends in parallel with a direction in which the base 77 extends. In other words, the impact portion 84 extends in the width direction Dw.

A cross-sectional shape of the impact portion 84 is not limited as long as the cross-sectional shape extends in a direction perpendicular to the drawing direction Dm2. For example, the shape may be a polygonal shape or a circular shape.

In addition, the manufacturing method of the impact portion 84 is not limited. For example, the support column 83 and the impact portion 84 may be connected to each other by welding. In addition, for example, the support column 83 and the impact portion 84 may be integrally manufactured by being cut out from one material.

Hammer Portion

The hammer portion 85 is configured such that a load for moving the hook 70 in the drawing direction Dm2 can be applied to the hook 70. Specifically, the hammer portion 85 is configured to apply a load to the impact portion 84 in the drawing direction Dm2. In other words, the hammer portion 85 is configured such that the hammer portion 85 can collide with the impact portion 84 in the drawing direction Dm2 from the base 77 toward the impact portion 84. The hammer portion 85 extends in a direction perpendicular to the drawing direction Dm2 with respect to the support column 83. That is, the hammer portion 85 extends in parallel with the direction in which the base 77 extends and the direction in which the impact portion 84 extends. In other words, the hammer portion 85 extends in the width direction Dw. The hammer portion 85 is provided to be located between the base 77 and the impact portion 84 in the drawing direction Dm2. The hammer portion 85 is movable in the drawing direction Dm2 in a state in which the support column 83 is internally inserted. That is, the hammer portion 85 is configured to be movable between the base 77 and the impact portion 84 in the drawing direction Dm2. That is, the hammer portion 85 is configured such that a hammer portion main body 86, which will be described below, collides with the impact portion 84 to apply a load to the hook 70 in the drawing direction Dm2. The hammer portion 85 includes the hammer portion main body 86 and a handle portion 87.

The hammer portion main body 86 is configured to be contacted with the impact portion 84. Specifically, the hammer portion main body 86 is configured to be contacted with a surface of the impact portion 84 on the base 77 side in the drawing direction Dm2. The hammer portion main body 86 extends in the width direction Dw. The hammer portion main body 86 is formed in a rod shape that extends in a linear shape in the width direction Dw. An inserting portion 86a that penetrates the hammer portion main body 86 in the drawing direction Dm2 is formed. The support column 83 can be inserted into the inserting portion 86a. The inserting portion 86a is movable relative to the support column 83 without being boned to the support column 83 in a state in which the support column 83 is inserted.

The handle portion 87 is configured to facilitate handling of the hammer portion 85. The handle portion 87 extends in the width direction Dw. The handle portion 87 is provided at both ends of the hammer portion main body 86 in the width direction Dw. The handle portion 87 in the second embodiment is formed integrally with the hammer portion main body 86 by being cut out from one material. The handle portion 87 is formed such that a diameter thereof in the width direction Dw is less than a diameter of the hammer portion main body 86.

The hammer portion main body 86 and the handle portion 87 may be manufactured integrally as described above, or may be manufactured in other manners.

For example, each of a pair of handle portions 87 may be welded to both ends of the hammer portion main body 86 in the width direction Dw. In addition, for example, the hammer portion main body 86 and the handle portion 87 may be configured to be connected to each other by being provided with a female screw and a male screw instead of welding and being screwed with each other.

Embodiment of Rotor Blade Detachment Method

A rotor blade detachment method S100 in the second embodiment will be described with reference to a flowchart shown in FIG. 9. The same reference numerals are assigned to the same components as those in the first embodiment, and detailed description thereof will be omitted.

After executing the disk rotation step S2, a device disposition step S3A is executed. In the device disposition step S3A, the rotor blade detachment device 60a according to the second embodiment is disposed at the first stage disk 40f. Specifically, the device disposition step S3A includes a hook disposition step S31A and a support portion disposition step S32A. The hook disposition step S31A and the support portion disposition step S32A in the second embodiment are performed in the same manner as the hook disposition step S31 and the support portion disposition step S32 in the first embodiment.

After executing the device disposition step S3A, a rotor blade movement step S4A is executed. The rotor blade movement step S4A includes a movement step S5A and a determination step S6A.

In the movement step S5A, the hammer portion 85 applies a load to the impact portion 84 in the drawing direction Dm2 to move the rotor blade 50 to be detached in the drawing direction Dm2 and draw the rotor blade 50 from the disk 40. Specifically, first, the hammer portion main body 86 is disposed in a state in which the hammer portion main body 86 does not come into contact with the impact portion 84. The hammer portion 85 is moved in the drawing direction Dm2 by the handle portion 87 being moved vigorously in the drawing direction Dm2. Therefore, the hammer portion main body 86 collides with the surface of the impact portion 84 on the base 77 side in the drawing direction Dm2. Then, the load is applied to the impact portion 84 in the drawing direction Dm2.

The determination step S6A is performed in the same manner as the determination step S6 in the first embodiment. The movement step S5A and the determination step S6A are repeatedly executed until it is determined in the determination step S6A that the blade root 52 of the rotor blade 50a to be detached comes out of the root groove 46. In a case where the movement step S5A is executed again, the hammer portion main body 86 is in a state of not being in contact with the impact portion 84, by moving the hammer portion 85 in the inserting direction Dm1.

Operation and Effects

According to the rotor blade detachment device 60a and the rotor blade detachment method S100 of the second embodiment described above, the hook 70 is applied with a load in the drawing direction Dm2 by the drawing portion 80a. Specifically, the hammer portion 85 is moved in the drawing direction Dm2. The hammer portion main body 86 collides with the impact portion 84 from the base 77 side in the drawing direction Dm2. In this manner, the hook 70 is applied with the load in the drawing direction Dm2 by the drawing portion 80a. Therefore, with the rotor blade detachment device 60a and the rotor blade detachment method S100 according to the second embodiment as well, the rotor blade 50 can be detached by being drawn from the disk 40.

According to the second embodiment, the drawing portion 80a is applied with a load in the drawing direction Dm2 only by the configuration structure. In other words, in a case where the load is applied in the drawing direction Dm2, the drawing portion 80a of the second embodiment does not require elements other than the components thereof. In the movement step S5A, the hammer portion main body 86 is disposed in a state in which the hammer portion main body 86 does not come into contact with the impact portion 84. The hammer portion 85 is moved in the drawing direction Dm2 by applying a load to the handle portion 87 in the drawing direction Dm2. Therefore, the hammer portion main body 86 collides with the surface of the impact portion 84 on the base 77 side in the drawing direction Dm2. Then, the load is applied to the impact portion 84 in the drawing direction Dm2. In this step, a machine such as the chipping hammer 90 in the first embodiment is not required. Thus, according to the second embodiment, when a load in the drawing direction Dm2 is applied to the drawing portion 80a, no machine other than the components is required.

In addition, in the second embodiment, the drawing portion 80a is attachable to and detachable from the hook 70. Specifically, the base 77 has the coupling hole 77b in which a female screw is formed at an inner peripheral surface, and the support column 83 has a male screw formed at an outer peripheral surface of one end portion in the drawing direction Dm2. The end portion of the support column 83 in the drawing direction Dm2 is inserted into the coupling hole 77b, and the female screw and the male screw are screwed with each other, so that the drawing portion 80a is attachably and detachably fixed to the hook 70. Since the drawing portion 80a is attachable to and detachable from the hook 70, the drawing portion 80 according to a different aspect from the second embodiment can also be used. An exemplary example of the different aspect of the drawing portion is the drawing portion 80 of the first embodiment. Thus, it is also possible to appropriately change the drawing portion to be used depending on a use application or the like.

Other Embodiments

As described above, each of the embodiments of the present disclosure has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the scope of the present disclosure.

For example, the rotor blade detachment device 60, 60a according to one embodiment may be formed of a single material or may be formed of a combination of different materials as appropriate.

In addition, in the rotor blade detachment device 60, 60a according to one embodiment, the hook 70 may not include the base 77, and the arm 76 and the drawing portion 80, 80a may be directly connected to each other.

In addition, in the rotor blade detachment device 60 according to the first embodiment, the first frame 81 may be one instead of the pair.

In addition, the rotor blade detachment device 60, 60a according to one embodiment may not include the support portion 78.

In addition, the rotor blade detachment device 60, 60a according to one embodiment may not include the locking portion 74 and the second projecting portion 75.

The rotor blade detachment device 60, 60a and the rotor blade detachment method S10, S100 according to the present disclosure can be appropriately used to detach the one-stage rotor blade 50 from the disk 40 without opening a casing of turbine 10, but the present disclosure is not limited thereto. For example, the present disclosure may be applied to the rotor blades 50 other than the one-stage rotor blade 50 that is detached by opening the casing of the turbine 10. In addition, the rotor blade detachment device 60, 60a and the rotor blade detachment method S10, S100 are not applied to only the turbine 10, and may be applied to another axial flow rotary machine such as the compressor 30.

Appendixes

A rotor blade detachment device and a rotor blade detachment method described in each embodiment are understood as follows, for example.

(1) According to a first aspect, a rotor blade detachment device 60, 60a that detaches a rotor blade 50 from a disk 40, in which the disk 40 has an outer peripheral surface 44 that extends in a circumferential direction Dc about an axis line Ar, a first end surface 45f that faces a first axis line side Dau of both sides in an axial direction Da in which the axis line Ar extends, a second end surface 45b that faces a second axis line side Dad opposite to the first axis line side Dau, and a root groove 46, the root groove 46 is recessed from the outer peripheral surface 44 toward a radial inner side Dri in a radial direction Dr of the axis line Ar, and penetrates from the second end surface 45b to the first end surface 45f, the rotor blade 50 has a blade body 51 that has a cross-section in a blade shape perpendicular to the radial direction Dr, and extends in the radial direction Dr, and a blade root 52 that is provided on the radial inner side Dri of the blade body 51, and is fitted into the root groove 46 in a state of being inserted from the first axis line side Dau toward the second axis line side Dad, the rotor blade detachment device 60, 60a includes: a hook 70 that is contactable with the rotor blade 50; and a drawing portion 80, 80a that is connected to the hook 70, and is configured to move the hook 70 in a drawing direction Dm2 from the second end surface 45b toward the first end surface 45f, the hook 70 has a contact portion 71 that is contactable with the rotor blade 50 from the second axis line side Dad in the axial direction Da, and an arm 76 that extends from the contact portion 71 in the drawing direction Dm2, and the drawing portion 80, 80a is connected to the arm 76 at a position opposite to the contact portion 71 in the drawing direction Dm2, and is configured to apply a load to the hook 70 in the drawing direction Dm2.

According to the configuration described above, in the axial direction Da, the hook 70 is in contact with the rotor blade 50 from the second axis line side Dad. In this state, in the axial direction Da, the drawing portion 80, 80a is disposed at a position opposite to the hooks 70 with respect to the rotor blade 50. Thereafter, the drawing portion 80 is applied with a load in the drawing direction Dm2. Therefore, the load is applied to the drawing portion 80 in the drawing direction Dm2 in a state in which the hook 70 is in contact with the rotor blade 50, so that the rotor blade 50 is detached by being drawn in the drawing direction Dm2. In addition, an operator from the first axis line side Dau of the axial direction Da with respect to the rotor blade 50 can bring the hook 70 into contact with the rotor blade 50 from the second axis line side Dad, or can apply the load in the drawing direction Dm2 to the drawing portion 80. Therefore, even in a case where the operator cannot directly access the rotor blades 50 spaced apart from each other in the axial direction Da, the rotor blades 50 can be detached without detaching an upper half portion of a casing and opening the casing. Accordingly, with the present aspect, it is possible to detach the rotor blade 50 without opening a casing.

(2) According to a second aspect, in the rotor blade detachment device 60, 60a according to (1), the hook 70 further includes a support portion 78 that is contactable with the rotor blade 50 from the first axis line side Dau, and is configured to support the rotor blade 50 in a state in which the rotor blade 50 is not movable in the drawing direction Dm2, together with the contact portion 71.

According to the configuration described above, the rotor blade 50 is further supported by the support portion 78. Specifically, the rotor blade 50 comes into contact with a tip of the support portion 78 in the axial direction Da from the first axis line side Dau. In a state in which the rotor blade detachment device 60, 60a is attached to the rotor blade 50, the rotor blade 50 comes into contact with the hook 70 from the second axis line side Dad and with the support portion 78 from the first axis line side Dau in the axial direction Da. Thus, the rotor blade 50 is supported in a state of being not movable in the drawing direction Dm2. Therefore, according to the present aspect, the rotor blade 50 can be drawn and detached from the disk 40 in a state in which a shape of the rotor blade 50 is less likely to be damaged.

(3) According to a third aspect, in the rotor blade detachment device 60, 60a according to (2), the hook 70 has a base 77 that is connected to the arm 76 at the position opposite to the contact portion 71 in the drawing direction Dm2, and extends in a direction perpendicular to the drawing direction Dm2, and the support portion 78 is moved at the base 77 to approach the hook 70, and supports the rotor blade 50 by pressing the rotor blade 50 against the contact portion 71 and sandwiching the rotor blade 50 with the contact portion 71.

According to the configuration described above, the hook 70 has the base 77 that is connected to the arm 76 at the position opposite to the contact portion 71 in the drawing direction Dm2 and extends in a direction perpendicular to the drawing direction Dm2. The support portion 78 is moved toward the base 77 to approach the hook 70. When the rotor blade detachment device 60, 60a is disposed with respect to the rotor blade 50 in this manner, the rotor blade 50 is supported by being sandwiched by the support portion 78 such that the rotor blade 50 is pressed toward the contact portion 71. The rotor blade 50 is supported by being sandwiched between the support portion 78 and the contact portion 71, and thus is more stably supported. Therefore, according to the present aspect, it is possible to more easily detach the rotor blade 50 from the disk 40.

(4) According to a fourth aspect, in the rotor blade detachment device 60, 60a according to (2) or (3), the base 77 is formed with a screw hole 77a, the support portion 78 has a screw shaft 78a that is movable at the base 77 in a state of being inserted into the screw hole 77a, and the screw shaft 78a is contactable with the rotor blade 50 from the first axis line side Dau by being moved at the base 77 to approach the contact portion 71.

According to the configuration described above, the screw shaft 78a is inserted into the screw hole 77a, and thus the support portion 78 is rotated and moved at the base 77. Therefore, the support portion 78 can come into contact with the rotor blade 50 from the first axis line side Dau in the axial direction Da. Therefore, according to the present aspect, it is possible to easily adjust the force with which the support portion 78 acts to press the rotor blade 50.

(5) According to a fifth aspect, in the rotor blade detachment device 60, 60a according to (1) to (4), the drawing portion 80, 80a is attachable to and detachable from the hook 70.

According to the configuration described above, it is also possible to use a drawing portion having a different aspect from the drawing portion 80, 80a of the aspect. Therefore, the drawing portion to be used can be appropriately changed depending on a use application and the like.

(6) According to a sixth aspect, in the rotor blade detachment device 60 according to (1) to (5), the drawing portion 80 has a first frame 81 that extends in the drawing direction Dm2 to extend the arm 76 of the hook 70, and a second frame 82 that is connected to the first frame 81 at a position opposite to the hook 70 in the drawing direction Dm2, and extends in a direction perpendicular to the drawing direction Dm2 with respect to the first frame 81, and the load is applied to the second frame 82.

According to the configuration described above, the second frame 82 extends in a direction perpendicular to the drawing direction Dm2, and the load toward the drawing direction Dm2 can be applied to the second frame 82. With the first frame 81, the second frame 82 can be disposed to be spaced apart from the rotor blade 50 in the axial direction Da in a state in which the rotor blade detachment device 60 is installed at the rotor blade 50. Therefore, it is easy for the operator to perform a step of applying a load in the drawing direction Dm2 to the second frame 82. Therefore, according to the present aspect, the rotor blade 50 can be stably and easily detached.

(7) According to a seventh aspect, in the rotor blade detachment device 60 according to (1) to (6), a chipping hammer 90 applies the load to the drawing portion 80.

With the configuration described above, the chipping hammer 90 applies the load to the second frame 82 to draw and detach the rotor blade 50 in the drawing direction Dm2. Accordingly, in a state of detaching the rotor blade 50, the drawing portion 80 and the operator exist on the same side of the rotor blade 50 in the drawing direction Dm2. Therefore, it is easier to determine whether or not the rotor blade 50 comes out of the root groove 46. This also contributes to prevention of the falling off of the rotor blade 50. In addition, with the chipping hammer 90, it is possible to apply a load to the second frame 82 even in a narrow space.

(8) According to an eighth aspect, in the rotor blade detachment device 60a according to (1) to (5), the drawing portion 80a has a support column 83 that extends in a rod shape in the drawing direction Dm2 to extend the arm 76 of the hook 70, an impact portion 84 that is connected to the support column 83 at a position opposite to the hook 70 in the drawing direction Dm2, and extends in a direction perpendicular to the drawing direction Dm2 with respect to the support column 83 to increase a diameter of the support column 83, and a hammer portion 85 that extends in the direction perpendicular to the drawing direction Dm2 with respect to the support column 83, is movable in the drawing direction Dm2 in a state in which the support column 83 is internally inserted, and collides with the impact portion 84.

According to the configuration described above, the hook 70 is applied with the load in the drawing direction Dm2 by the drawing portion 80a. Specifically, the hammer portion 85 is moved in the drawing direction Dm2. Then, the hammer portion 85 collides with the impact portion 84 from the base 77 side in the drawing direction Dm2. In this manner, the hook 70 is applied with the load in the drawing direction Dm2 by the drawing portion 80. Thus, the drawing portion 80 is applied with the load in the drawing direction Dm2 only by the configuration structure. Therefore, according to the present aspect, the drawing portion 80 can detach the rotor blade 50 by drawing the rotor blade 50 in the drawing direction Dm2 without using a machine other than the components.

(9) According to a ninth aspect, in the rotor blade detachment device 60, 60a according to (1) to (8), a width of the drawing portion 80, 80a, which is orthogonal to the drawing direction Dm2, is more than a width of the contact portion 71, which is orthogonal to the drawing direction Dm2.

According to the configuration described above, the drawing portion 80, 80a is formed larger than the portion in contact with the rotor blade 50. Thus, the drawing portion 80, 80a can be formed in a size that is easy to handle. In addition, the drawing portion 80, 80a can be configured to be likely to be applied with the load in the drawing direction Dm2.

(10) According to a tenth aspect, a rotor blade detachment method S10, S100 of detaching a rotor blade 50 from a disk 40, in which the disk 40 has an outer peripheral surface 44 that extends in a circumferential direction Dc about an axis line Ar, a first end surface 45f that faces a first axis line side Dau of both sides in an axial direction Da in which the axis line Ar extends, a second end surface 45b that faces a second axis line side Dad opposite to the first axis line side Dau, and a root groove 46, the root groove 46 is recessed from the outer peripheral surface 44 toward a radial inner side Dri in a radial direction Dr of the axis line Ar, and penetrates from the second end surface 45b to the first end surface 45f, the rotor blade 50 has a blade body 51 that has a cross-section in a blade shape perpendicular to the radial direction Dr, and extends in the radial direction Dr, and a blade root 52 that is provided on the radial inner side Dri of the blade body 51, and is fitted into the root groove 46 in a state of being inserted from the first axis line side Dau toward the second axis line side Dad, the rotor blade detachment method S10, S100 includes: a preparation step of preparing a rotor blade detachment device 60, 60a; a device disposition step of disposing the rotor blade detachment device 60, 60a at the disk 40; and a rotor blade movement step of moving the rotor blade 50 attached to the disk 40 by operating the rotor blade detachment device 60, 60a, the rotor blade detachment device 60, 60a prepared in the preparation step includes a hook 70 that is contactable with the rotor blade 50, and a drawing portion 80, 80a that is connected to the hook 70, and is configured to move the hook 70 in a drawing direction Dm2 from the second end surface 45b toward the first end surface 45f, the hook 70 has a contact portion 71 that is contactable with the rotor blade 50 from the second axis line side Dad in the axial direction Da, and an arm 76 that extends from the contact portion 71 in the drawing direction Dm2, the drawing portion 80, 80a is connected to the arm 76 at a position opposite to the contact portion 71 in the drawing direction Dm2, and is configured to apply a load to the hook 70 in the drawing direction Dm2, in the device disposition step, the hook 70 is brought into contact with the rotor blade 50 from the second axis line side Dad in the axial direction Da, and the drawing portion 80, 80a is disposed on the first axis line side Dau with respect to the rotor blade 50, and in the rotor blade movement step, the rotor blade 50 is moved in the drawing direction Dm2 by applying the load to the drawing portion 80, 80a.

According to the configuration described above, in the axial direction Da, the hook 70 is in contact with the rotor blade 50 from the second axis line side Dad. In this state, in the axial direction Da, the drawing portion 80, 80a is disposed at a position opposite to the hooks 70 with respect to the rotor blade 50. Thereafter, in the rotor blade movement step, the drawing portion 80, 80a is applied with the load in the drawing direction Dm2. Therefore, the drawing portion 80, 80a is applied with the load in the drawing direction Dm2 in a state in which the hook 70 is brought into contact with the rotor blade 50, so that the rotor blade 50 is detached by being drawn in the drawing direction Dm2. In addition, the operator from the first axis line side Dau of the axial direction Da with respect to the rotor blade 50 can bring the hook 70 into contact with the rotor blade 50 from the second axis line side Dad, or can apply the load in the drawing direction Dm2 to the drawing portion 80. Therefore, even in a case where the operator cannot directly access the rotor blades 50 spaced apart from each other in the axial direction Da, the rotor blades 50 can be detached without detaching an upper half portion of a casing and opening the casing. Accordingly, with the present aspect, it is possible to detach the rotor blade 50 without opening the casing.

(11) According to an eleventh aspect, in the rotor blade detachment method S10 according to (10), the drawing portion 80 has a first frame 81 that extends in the drawing direction Dm2 to extend the arm 76 of the hook 70, and a second frame 82 that is connected to the first frame 81 at a position opposite to the hook 70 in the drawing direction Dm2, and extends in a direction perpendicular to the drawing direction Dm2 with respect to the first frame 81, the load is applied to the second frame 82, and in the rotor blade movement step, the load is applied to the second frame 82 by a chipping hammer 90 to move the rotor blade 50 in the drawing direction Dm2.

According to the configuration described above, the second frame 82 extends in a direction perpendicular to the drawing direction Dm2, and the load toward the drawing direction Dm2 can be applied to the second frame 82. With the first frame 81, the second frame 82 can be disposed to be spaced apart from the rotor blade 50 in the axial direction Da in a state in which the rotor blade detachment device 60 is installed at the rotor blade 50. Therefore, it is easy for the operator to perform a step of applying a load in the drawing direction Dm2 to the second frame 82. In addition, in the rotor blade movement step, the load for drawing and detaching the rotor blade 50 in the drawing direction Dm2 to the second frame 82 is applied by the chipping hammer 90. In a state of detaching the rotor blade 50, the drawing portion 80 and the operator exist on the same side of the rotor blade 50 in the drawing direction Dm2. Therefore, in the rotor blade movement step, it is easier to determine whether or not the rotor blade 50 comes out of the root groove 46. This also contributes to prevention of the falling off of the rotor blade 50. In addition, with the chipping hammer 90, it is possible to apply a load to the second frame 82 even in a narrow space.

(12) According to a twelfth aspect, in the rotor blade detachment method S100 according to (10), the drawing portion 80a has a support column 83 that extends in a rod shape in the drawing direction Dm2 to extend the arm 76 of the hook 70, an impact portion 84 that is connected to the support column 83 at a position opposite to the hook 70 in the drawing direction Dm2, and extends in a direction perpendicular to the drawing direction Dm2 with respect to the support column 83 to increase a diameter of the support column 83, and a hammer portion 85 that extends in the direction perpendicular to the drawing direction Dm2 with respect to the support column 83, is movable in the drawing direction Dm2 in a state in which the support column 83 is internally inserted, and collides with the impact portion 84, and in the rotor blade movement step, the load is applied to the drawing portion 80a by moving the hammer portion 85 in the drawing direction Dm2 to collide with the impact portion 84, and the rotor blade 50 is moved in the drawing direction Dm2.

According to the configuration described above, the hook 70 is applied with the load in the drawing direction Dm2 by the drawing portion 80a. Specifically, the hammer portion 85 is moved in the drawing direction Dm2. Then, in the rotor blade movement step, the hammer portion 85 collides with the impact portion 84 from the base 77 side in the drawing direction Dm2. In this manner, the hook 70 is applied with the load in the drawing direction Dm2 by the drawing portion 80a. Thus, the drawing portion 80a is applied with the load in the drawing direction Dm2 only by the configuration structure. Therefore, according to the present aspect, the drawing portion 80a can detach the rotor blade 50 by drawing the rotor blade 50 in the drawing direction Dm2 without using a machine other than the components.

With a rotor blade detachment device and a rotor blade detachment method of the present disclosure, a rotor blade can be detached from a disk without opening a casing.

While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary examples of the invention and are not to be considered as limiting. Additions, omissions, substitutions, and other modifications can be made without departing from the scope of the invention. Accordingly, the invention is not to be considered as being limited by the foregoing description and is only limited by the scope of the appended claims.

EXPLANATION OF REFERENCES

• • 1 Gas turbine
  • 2 Gas turbine rotor
  • 5 Gas turbine casing
  • 6 Intermediate casing
  • 10 Turbine
  • 11 Turbine rotor
  • 12 Rotor shaft
  • 13 Rotor blade row
  • 13f first stage rotor blade row
  • 13s second stage rotor blade row
  • 15 Turbine casing
  • 17 Stator blade row
  • 20 Combustor
  • 30 Compressor
  • 31 Compressor rotor
  • 32 Rotor shaft
  • 33 Rotor blade row
  • 33f First stage rotor blade row
  • 33s Second stage rotor blade row
  • 35 Compressor casing
  • 37 Stator blade row
  • 40 Disk
  • 40f First stage disk
  • 40s Second stage disk
  • 41 Body portion
  • 42f Inner leading end surface
  • 42b Inner trailing end surface
  • 43 Rotor blade attachment portion
  • 44 Outer peripheral surface
  • 45f First end surface (outer leading end surface)
  • 45b Second end surface (outer trailing end surface)
  • 46 Root groove
  • 47f Leading end opening
  • 47b Trailing end opening
  • 50 Rotor blade
  • 50a Rotor blade to be detached
  • 51 Blade body
  • 51f Leading edge
  • 51b Trailing edge
  • 51s Blade surface
  • 52 Blade root
  • 53f Blade root leading end surface
  • 53b blade root trailing end surface
  • 54 Blade root side surface
  • 60, 60a Rotor blade detachment device
  • 70 Hook
  • 71 Contact portion
  • 72 Contact portion main body
  • 73 First projecting portion
  • 74 Locking portion
  • 75 Second projecting portion
  • 76 Arm
  • 77 Base
  • 77a Screw hole
  • 77b Coupling hole
  • 78 Support portion
  • 78a Screw shaft
  • 78b Screw head portion
  • 80, 80a Drawing portion
  • 81 First frame
  • 82 Second frame
  • 83 Support column
  • 83a Coupling portion
  • 84 Impact portion
  • 85 Hammer portion
  • 86 Hammer portion main body
  • 86a Inserting portion
  • 87 Handle portion
  • 90 Chipping hammer
  • A Air
  • F Fuel
  • Ar Axis line
  • Da Axial direction
  • Dau First axis line side (axis line upstream-side)
  • Dad Second axis line side (axis line downstream-side)
  • Dc Circumferential direction
  • Dr Radial direction
  • Dri Radial inner side
  • Dro Radial outer side
  • Dm Groove-through direction
  • Dm1 Inserting direction
  • Dm2 Drawing direction
  • Dw Width direction
  • Ds Screw-through direction
  • S10, S100 Rotor blade detachment method
  • S1 Preparation step
  • S2 Disk rotation step
  • S3 Device disposition step
  • S31, S31A Hook disposition step
  • S32, S32A Support portion disposition step
  • S4, S4A Rotor blade movement step
  • S5, S5A Movement step
  • S6, S6A Determination step