SCROLL PLATE COVER AND SCROLL COMPRESSOR

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage application of International Patent Application No. PCT/CN2023/102092, filed on Jun. 25, 2023, which claims priority to Chinese Patent Application No. 202210925352.2 and Chinese Patent Application No. 202222028684.9, filed on Jul. 29, 2022, each of which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

The present disclosure relates to a scroll cover and a scroll compressor with the scroll cover.

BACKGROUND

In a scroll compressor, especially a co-rotating scroll compressor (CRC), under the action of pressure and centrifugal force, a part of the lubricating oil may be accumulated in the space outside the oil tank of the scroll compressor, which may increase the risk of oil loss in the scroll compressor, and further adversely impact the refrigeration effect, oil circulation rate (OCR), input power and energy efficiency ratio (EER) of the scroll compressor.

SUMMARY

The present disclosure is made to solve the above technical problems and other potential technical problems.

According to an aspect of the present disclosure, a scroll cover of a scroll compressor is provided. The scroll compressor includes a scroll. The scroll cover includes a peripheral wall and a chamber formed on the inner side of the peripheral wall, the chamber being configured to accommodate the scroll. At least one discharge hole is provided in the peripheral wall, and the discharge hole penetrates the peripheral wall along the thickness direction of the peripheral wall so as to allow fluid from the scroll to be discharged from an inner side of the peripheral wall to an outer side of the peripheral wall via the discharge hole.

Specifically, multiple discharge holes are arranged in the peripheral wall and are evenly distributed at equal center angle intervals in the circumferential direction of the peripheral wall.

Optionally, multiple crescent-shaped cavities and multiple one-way flow channels are provided on the end surface of the peripheral wall, wherein each one-way flow channel corresponds to one of the cavities. The multiple cavities are evenly distributed at equal center angles in the circumferential direction of the peripheral wall. One side of each one of the cavities opens toward the chamber to allow the fluid in the chamber to flow into the one of the cavities, while the other side of the one of the cavities is in communication with the corresponding one of the one-way flow channels. One end of each one of the one-way flow channels is connected to the corresponding one of the cavities, while the other end of each one of the one-way flow channels is connected to the outer side of the peripheral wall to allow the fluid from the cavities to be discharged from the cavities to the outer side of the peripheral wall in a one-way manner.

Optionally, a first positioning pin hole and/or a second positioning pin hole and/or a counterweight hole are provided in the scroll cover. The first positioning pin hole is used for positioning the scroll in the chamber. The second positioning pin hole is used for positioning the scroll cover on a component supporting the scroll cover. The counterweight hole may be filled with a counterweight material, or the counterweight hole may be kept in a hollow state without being filled with a counterweight material.

Optionally, the scroll cover may be made from an aluminum alloy or cast iron (e.g., ductile iron).

According to another aspect of the present disclosure, a scroll compressor is provided. The scroll compressor includes: a first scroll; a second scroll, which cooperates with the first scroll to form a compression chamber, and is able to rotate with the first scroll; a flange, which is able to slidably contact and support the second scroll, and is directly or indirectly connected to the first scroll; a motor, which is able to drive the flange to rotate, and then drive the first scroll to rotate; and a scroll cover according to the previous aspect, the chamber of the scroll cover accommodating the first scroll and the second scroll.

Specifically, the first scroll is fixedly connected to the scroll cover, and the scroll cover is fixedly connected to the flange, so that when the motor drives the flange to rotate, the first scroll also rotates. The first scroll drives the second scroll to rotate.

Specifically, the first scroll is disposed above the second scroll which is disposed above the flange, and the height at which the discharge hole is located is higher than or equal to the height at which the contact surface between the flange and the second scroll is located.

Optionally, at least one additional discharge hole is provided in the flange, the additional discharge hole allowing fluid to drain from the chamber to the outer side of the flange.

Optionally, a positioning hole corresponding to the second positioning pin hole is provided on the flange, and the scroll cover is positioned relative to the flange by using positioning pins inserted in the positioning hole of the flange and the second positioning pin hole.

Optionally, the scroll cover and the first scroll are integrally molded by casting.

By adopting the technical solution of the present disclosure, the above-mentioned lubricating oil accumulation can be reduced or eliminated, thereby improving the refrigeration effect, oil circulation rate (OCR), input power and energy efficiency ratio (EER) of the scroll compressor.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to facilitate the understanding of the present disclosure, the present disclosure is described in more detail below based on exemplary embodiments and in conjunction with the accompanying drawings. The same or similar reference numerals are used in the accompanying drawings to represent the same or similar components. It should be understood that the accompanying drawings are only schematic, and the sizes and scales of the components in the accompanying drawings are not necessarily accurate.

FIG. 1 is a partial longitudinal sectional view of a scroll compressor according to an exemplary embodiment of the present disclosure.

FIGS. 2A and 2B are respectively an assembled view and an exploded view of the scroll assembly in the scroll compressor shown in FIG. 1.

FIGS. 3A and 3B are perspective views of a scroll cover according to an exemplary embodiment of the present disclosure.

FIG. 4A is a longitudinal sectional view of a scroll cover according to an exemplary embodiment of the present disclosure.

FIG. 4B is a longitudinal sectional view of an assembly of a scroll cover and a driving scroll according to an exemplary embodiment of the present disclosure.

FIG. 5 is a partial longitudinal sectional view of a scroll compressor according to another exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

In a co-rotating scroll compressor, the lubricating oil between the two scrolls and between the contact surfaces of the flange and the driven scroll separates toward the outer circumference of the driving scroll and the driven scroll, and is accumulated in the space surrounded by the scroll cover, the scroll and the flange. The lubricating oil may return to the compression chamber of the driving scroll and the driven scroll, or create resistance to the rotation of the scroll, or increase the risk of oil loss in the oil pool of the compressor. This is not good to such as the refrigeration effect, oil circulation rate (OCR), input power and energy efficiency ratio (EER) of the scroll compressor.

Therefore, it is desirable to reduce or eliminate the lubricant accumulation described above.

FIG. 1 is a partial longitudinal sectional view of a scroll compressor (e.g., a co-rotating scroll compressor (CRC)) according to an exemplary embodiment of the present disclosure. FIGS. 2A and 2B are respectively an assembled view and an exploded view of a scroll assembly in the scroll compressor shown in FIG. 1.

As shown in FIGS. 1, 2A and 2B, the scroll compressor 100 mainly includes a housing 5, and a scroll cover 1, a first scroll 2, a second scroll 3, a flange 4 and a motor 6 disposed in the housing. In addition, a shield 51 may be disposed outside the first scroll 2 and the second scroll 3.

In the present exemplary embodiment, as shown in FIG. 1, the first scroll 2 is a driving scroll, while the second scroll 3 is a driven scroll. A scroll 21 is provided on the lower surface of the first scroll 2, and a scroll 32 is provided on the upper surface of the second scroll 3. The first scroll 2 is provided above the second scroll 3, and the second scroll 3 is provided above the flange 4. The second scroll 3 and the first scroll 2 cooperate with each other to form a compression chamber 22 located at the center, and the second scroll 3 can rotate along with the first scroll 2.

The scroll cover 1 includes a peripheral wall 11 and a chamber 12 formed on the inner side of the peripheral wall 11. The chamber 12 is used to accommodate the first scroll 2 and the second scroll 3. As shown in FIGS. 2A and 2B, multiple through holes 15 are provided in the outer peripheral area of the scroll cover 1, and multiple threaded holes 42 are provided in the outer peripheral area of the flange 4. The multiple threaded holes 42 can be aligned one by one with the multiple through holes 15. The lower surface 16 of the outer peripheral area (i.e., the peripheral wall 11) of the scroll cover 1 abuts against the upper surface of the outer peripheral area of the flange 4. Multiple bolts 17 are screwed into the corresponding threaded holes 42 via the corresponding through holes 15, thereby fixing the first scroll 2 to the flange 4. The upper surface 41 of the flange 4 slidably contacts and supports the second scroll 3. The motor 6 can drive the flange 4 to rotate, thereby driving the first scroll 2 to rotate. In addition, the material constituting the scroll cover 1 and surface treatment process can be appropriately selected according to actual needs. For example, it can be an aluminum alloy or a cast iron material (e.g., ductile iron). In addition, the scroll cover 1 can be integrally molded with the first scroll 2 by casting.

When the flange 4, the first scroll 2 and the second scroll 3 rotate, the oiling screw 7 rotates with driven by the second scroll 3, and the lubricating oil is delivered from the oil pool (not shown) at the bottom of the scroll compressor 100 to the flange 4, the first scroll 2 and the second scroll 3. Under the action of pressure and centrifugal force, a part of the lubricating oil is separated radially outward from a space between the first scroll 2 and the second scroll 3 and between the contact surface of the flange 4 and the second scroll 3, and is accumulated in the space S as shown in FIG. 1. The lubricating oil may return to the compression chamber 22, or generate resistance to the rotation of the first scroll 2 and the second scroll 3, or increase the risk of oil loss in the oil pool. This is not good for the refrigeration effect, oil circulation rate (OCR), input power, energy efficiency ratio (EER), etc. of the scroll compressor 100.

FIGS. 3A and 3B are perspective views of a scroll cover according to an exemplary embodiment of the present disclosure. FIG. 4A is a longitudinal sectional view of a scroll cover according to an exemplary embodiment of the present disclosure. FIG. 4B is a longitudinal sectional view of an assembly of a scroll cover and a driving scroll according to an exemplary embodiment of the present disclosure. Note that the cutting plane of FIG. 4A and the cutting plane of FIG. 4B are perpendicular to each other.

As shown in FIGS. 3A to 4B, in order to reduce or eliminate the situation in which the lubricating oil is accumulated in the space S described above, in an exemplary embodiment of the present disclosure, at least one discharge hole 14 (two discharge holes 14 are shown in FIGS. 3A to 4A) is provided in the peripheral wall 11 of the scroll cover 1. The discharge hole 14 penetrates the peripheral wall 11 along the thickness direction of the peripheral wall 11 so as to allow the lubricating oil from the scrolls 2 and 3 to be discharged from the inside of the peripheral wall 11 to the outer side of the peripheral wall 11 via the discharge hole 14. The lubricating oil discharged from the discharge hole 14 further flows back to the oil pool via the lubricating oil collection device and the dedicated reflux channel (not shown). When multiple discharge holes 14 are provided in the peripheral wall 11, the multiple discharge holes 14 may be evenly distributed at equal center angle intervals in the circumferential direction of the peripheral wall 11.

In addition, as shown in FIG. 3B, multiple crescent-shaped cavities 18 and multiple one-way flow channels 19 are provided on the end surface 16 of the peripheral wall 11. Each of the one-way flow channels 19 corresponds to one of the cavities 18. In the circumferential direction of the peripheral wall 11, multiple cavities 18 are evenly distributed at equal center angles. One side of the cavity 18 opens toward the chamber 12 so as to allow the fluid in the chamber 12 to flow into the cavity 18, while the other side of the cavity 18 is in communication with the one-way flow channel 19. One end of the one-way flow channel 19 is in communication with the cavity 18, while the other end of the one-way flow channel 19 is in communication with the outer side of the peripheral wall 11 so as to allow the fluid from the cavity 18 to be discharged from the cavity 18 to the outer side of the peripheral wall 11 in a one-way manner.

When the scroll compressor 100 rotates at a high speed, a part of the lubricating oil accumulated in the space S can be thrown into the crescent-shaped cavity 18 under the action of centrifugal force. In this way, a part of the lubricating oil accumulated in the space S can be discharged from the inner side of the peripheral wall 11 to the outer side of the peripheral wall 11 through the discharge hole 14 as described above, while the other part of the lubricating oil can be discharged to the outer side of the peripheral wall 11 through the one-way flow channel 19.

In particular, the flow channel structure of the one-way flow channel 19 is designed to ensure that lubricating oil or refrigerant gas can only flow out of the one-way flow channel 19 in one direction, and cannot flow back into the cavity 18 from the outer side of the peripheral wall 11.

In addition, as shown in FIG. 2B, FIGS. 3A and 3B, the scroll cover 1 is provided with a first positioning pin hole 10 and/or a second positioning pin hole 161 and/or a counterweight hole 162.

The first positioning pin hole 10 is used together with the positioning pin 8 to position the scroll in the chamber 12.

The second positioning pin hole 161 is used together with the positioning pin 8 to position the scroll cover 1 on the component (the flange 4 in this exemplary embodiment) supporting the scroll cover 1. Specifically, a positioning hole 44 corresponding to the second positioning pin hole 161 is provided on the flange 4. The scroll cover 1 is positioned relative to the flange 4 by using the positioning pin 8 inserted in the positioning hole 44 of the flange 4 and the second positioning pin hole 161.

Furthermore, in order to improve the dynamic balance characteristics of the support scroll cover 1, the weight hole 162 may be filled with a suitable weight material, or the weight hole 162 may be kept hollow without being filled with a weight material as appropriate.

As shown in FIG. 4B, the first scroll 2 is fixedly mounted to the scroll cover 1 so as to rotate along with the scroll cover 1. A through hole 13 is provided at the top of the scroll cover 1 so as to allow refrigerant to pass therethrough.

As shown in FIGS. 1, 4A and 4B, the height at which the discharge hole 14 is located is slightly higher than or equal to the height at which the contact surface between the flange 4 and the second scroll plate 3 (i.e., the height of the upper surface 41 of the flange 4) is located. In this way, it can be ensured that the space S is in communication with the outer side of the peripheral wall 11 through the discharge hole 14.

When the flange 4, the first scroll 2, and the second scroll 3 rotate, the lubricating oil accumulated in the space S is discharged from the inner side of the peripheral wall 11 to the outer side of the peripheral wall 11 through the discharge hole 14 under the action of centrifugal force. The lubricating oil discharged to the outer side of the peripheral wall 11 flows downward under the action of gravity and the blocking effect of the shield 51, and finally flows back to the oil pool of the scroll compressor. The lubricating oil will also flow onto the motor 6 and cool the motor 6 in the process of returning to the oil pool.

The above describes the case where the discharge hole 14 is provided in the peripheral wall 11 of the scroll cover 1. In addition to the above, additional discharge holes may be provided in the flange 4, as described below with reference to FIG. 5.

FIG. 5 is a partial longitudinal sectional view of a scroll compressor according to another exemplary embodiment of the present disclosure. The embodiment shown in FIG. 5 differs from the embodiment described above in that at least one discharge hole 43 is provided in the flange 4. The upper surface 41 of the flange 4 (see FIG. 1, a portion of the upper surface 41 is used as a thrust surface) is in communication with the outer side of the bottom surface of the flange 4 through the discharge hole 43. In this way, the lubricating oil accumulated on the thrust surface is discharged to the outer side of the bottom surface of the flange 4 via the discharge hole 43. The lubricating oil discharged from the discharge hole 43 then flows back to the oil pool via the lubricating oil collection device and a dedicated return channel (not shown).

By adopting the technical solution of the above exemplary embodiment of the present disclosure, it is possible to i) prevent the lubricating oil accumulated in the space S from returning to the compression chamber 22, thereby improving the volumetric efficiency and improving the refrigeration effect of the scroll compressor; ii) improve the OCR, which can be maintained at a level of 0˜10%; iii) reduce the input power and improve the energy efficiency ratio (EER); and iv) better cool the motor 6.

Although the technical objectives, technical solutions and technical effects of the present disclosure are described in detail with reference to specific embodiments and variations, it should be understood that the above embodiments and variations are only exemplary and not restrictive. Without departing from the essential spirit and principles of the present disclosure, any modification, equivalent substitution and improvement made by those skilled in the art are included in the protection scope of the present disclosure.