COMBUSTION CHAMBER ASSEMBLY

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of priority to Korean Patent Application No. 10-2024-0194245, filed in the Korean Intellectual Property Office on December 23, 2024, and Korean Patent Application No. 10-2025-0120550, filed in the Korean Intellectual Property Office on August 27, 2025, the entire contents of which are incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to a combustion chamber assembly.

BACKGROUND

A water heater that heats water to drain the heated water or to use it for heating generally receives fuel and burns it, and then transfers heat generated thereby to the water to achieve its intended purpose.

In a water heater, a combustion reaction occurs by using a burner to generate heat. When the combustion reaction occurs, flame and combustion gas are generated as by-products. Because a durability of the heat exchanger may be severely degraded when heat is transferred in a manner, in which the flame directly contacts the heat exchanger, through which heating water flows, heat is mainly transferred to the heating water that flows in the heat exchanger by using the combustion gas.

In this way, the water heater may include a combustion chamber assembly that includes a burner and the like. The combustion chamber assembly may include a heat exchange assembly that accommodates a burner, a mixing chamber that is coupled to the heat exchange assembly to cover the burner, and a packing member that is disposed between the heat exchange assembly and the mixing chamber.

When the heat exchange assembly and the mixing chamber are coupled to each other, positions of the heat exchange assembly and the mixing chamber need to be guided. Furthermore, when the heat exchange assembly and the mixing chamber are coupled to each other, there is a concern that the packing member disposed between the heat exchange assembly and the mixing chamber may be damaged.

Accordingly, when the heat exchange assembly and the mixing chamber are coupled to each other, a need for a structure that guides positions of the heat exchange assembly and the mixing chamber for productivity or to prevent damage to the packing member is increasing.

SUMMARY

The present disclosure has been made to solve the above-mentioned problems occurring in the prior art while advantages achieved by the prior art are maintained intact.

An aspect of the present disclosure provides a combustion chamber assembly, in which positions of a heat exchange assembly and a mixing chamber are guided when the heat exchange assembly and the mixing chamber are coupled to each other.

The technical problems to be solved by the present disclosure are not limited to the aforementioned problems, and any other technical problems not mentioned herein will be clearly understood from the following description by those skilled in the art to which the present disclosure pertains.

According to an aspect of the present disclosure, a combustion chamber assembly includes a heat exchange assembly that defines a combustion chamber configured such that a combustion reaction is performed in an interior thereof, a burner that is provided in the interior of the heat exchange assembly to form the combustion reaction in the combustion chamber, and a mixing chamber that is coupled to the burner and the heat exchange assembly, and the mixing chamber includes a burner coupling area that is coupled to the burner, an assembly coupling area that is provided on an outer side of the burner coupling area in the circumferential direction, and that is coupled to the heat exchange assembly, and a guide rib that may protrude from the burner coupling area toward the interior of the heat exchange assembly.

The heat exchange assembly may include an inner wall that defines the combustion chamber, and the guide rib may be spaced apart from the inner wall.

The guide rib may protrude toward the interior of the heat exchange assembly from an inner surface of the burner coupling area, which faces the interior of the heat exchange assembly.

The inner wall may include an inner wall surface that defines the combustion chamber, the guide rib may include a rib surface that faces the inner wall surface, and the rib surface may be spaced apart from the inner wall surface.

A plurality of guide ribs may be provided, and the plurality of guide ribs may be located at corners of the burner coupling area in the circumferential direction.

The heat exchange assembly may further include a flange area that extends from the inner wall in an outward direction of the heat exchange assembly and is coupled to the assembly coupling area, and the combustion chamber assembly may further include an outer packing member that is disposed between the flange area and the assembly coupling area.

The flange area may include a support area that supports the outer packing member, and a cover area that extends from the support area to cover one side of the outer packing member, and the cover area and the outer packing member may be spaced apart from each other.

A first spacing distance between the guide rib and the inner wall may be smaller than a second spacing distance between the cover area and the outer packing member.

A distance between an outer surface of the cover area, which faces an outer side in the circumferential direction, and the guide rib may be greater than a distance between the outer surface of the cover area and the inner wall surface of the inner wall, which defines the combustion chamber.

The combustion chamber assembly may further include an inner packing member that is located on an inner side of the outer packing member in a direction crossing the circumferential direction, and that is disposed between the flange area and the assembly coupling area.

The inner packing member may be spaced apart from the outer packing member.

The flange area may include a support area that supports the outer packing member, and a cover area that extends from the support area to cover one side of the outer packing member, and the assembly coupling area may include an outer fixing rib that extends from a support surface of the assembly coupling area, which faces the support area, between the inner packing member and the outer packing member, and an inner fixing rib that extends from the support surface to an inner side of the inner packing member in the circumferential direction, and that fixes the inner packing member.

When a direction, in which the guide rib faces the interior of the heat exchange assembly is defined as one direction, a first height between one end of the guide rib, which faces the one direction, and the inner fixing rib may be greater than a second height of the cover area in the one direction.

The outer packing member may include silicon.

The inner packing member may include graphite.

The combustion chamber assembly may further include a coupling member that couples the heat exchange assembly and the mixing chamber, and the coupling member may pass through the assembly coupling area, the flange area, and the outer packing member.

The combustion chamber assembly may further include a burner packing member that is provided between the burner and the mixing chamber and that seals a space between the burner and the mixing chamber.

The burner may include a burner flange area that is coupled to the burner coupling area, and the burner packing member may be disposed on an inner side of the burner coupling area in the circumferential direction, and may contact the burner flange area.

The mixing chamber may further include a burner packing fixing rib that is disposed on an inner side of the burner coupling area in the circumferential direction, and that forms a burner packing groove for inserting the burner packing member together with the burner coupling area, and the burner packing groove may be covered by the burner flange area.

The burner packing member may include graphite.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and advantages of the present disclosure will be more apparent from the following detailed description taken in conjunction with the accompanying drawings:

FIG. 1 is a perspective view of a combustion chamber assembly according to an embodiment of the present disclosure;

FIG. 2 is an exploded perspective view of a combustion chamber assembly according to an embodiment of the present disclosure;

FIG. 3 is an exploded perspective view of a burner, a burner packing member, a mixing chamber, and a fixing member according to an embodiment of the present disclosure;

FIG. 4 is an exploded perspective view of a heat exchange assembly, a mixing chamber, to which the burner is coupled, an inner packing member, an outer packing member, and a coupling member according to an embodiment of the present disclosure;

FIG. 5 is a bottom perspective view of a mixing chamber according to an embodiment of the present disclosure;

FIG. 6 is an enlarged view of FIG. 5;

FIG. 7 is a longitudinal sectional view of the combustion chamber assembly;

FIG. 8 is an enlarged view of FIG. 7; and

FIG. 9 is a longitudinal sectional view of the combustion chamber assembly on a different plane from that of FIG. 8.

DETAILED DESCRIPTION

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In adding reference numerals in the drawings, the same reference numerals will be used throughout to designate the same or equivalent components. In describing embodiments of the present disclosure, detailed descriptions associated with well-known functions or configurations will be omitted if they may make subject matters of the present disclosure unnecessarily obscure.

In the specification, a first direction D1, a second direction D2, and a third direction D3 are referred to for convenience, and may be directions that are perpendicular to each other.

In the specification, a horizontal direction and a vertical direction are referred for convenience, and may be directions that are perpendicular to each other. However, the directions are determined relatively to a direction in which components of the combustion chamber assembly are arranged, and the upward/downward direction does not necessarily mean a vertical direction.

Additionally, terms including ordinal numbers, such as “first,” “second,” etc., used herein may be used to describe various components, but the components are not limited by the terms, and the terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope and spirit of the present disclosure, a first component may be referred to as a second component, and similarly, the second component may be referred to as the first component. The term “and/or” includes any combination of a plurality of related listed items or any one of the plurality of related listed items.

FIG. 1 is a perspective view of a combustion chamber assembly according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view of a combustion chamber assembly according to an embodiment of the present disclosure.

Referring to FIGS. 1 and 2, a combustion chamber assembly 100 may include a heat exchange assembly 200, a burner 300, and a mixing chamber 400.

The heat exchange assembly 200 may define a combustion chamber that is configured such that a combustion reaction occurs in an interior thereof. The heat exchange assembly 200 may include an insulating pipe 210 and a passage cap plate 220.

The insulating pipe 210 may be disposed on opposite sides (direction D3 or an opposite direction to D3) of a third direction of the combustion chamber, and heating water may flow therethrough. Heating water may flow in an interior of the insulating pipe 210 to insulate the combustion chamber. The insulating pipe 210 may be formed in a pipe shape.

The passage cap plate 220 covers opposite sides (direction D2 or an opposite direction to D2) of a second direction of the combustion chamber, and may define a space, through which heating water discharged from any one of a pair of insulating pipes 210 may flow. A space of the passage cap plate 220 may communicate with the other one of the pair of insulating pipes 210, and may define a passage, through which heating water delivered from any one of the pair of insulating pipes 210 is delivered to the other one of the pair of insulating pipes 210.

The combustion chamber may be configured such that a combustion reaction occurs in an interior space of the heat exchange assembly 200. The combustion chamber may be formed such that opposite sides thereof are opened along a direction, in which combustion gas flows. As an example, although a combustion chamber, of which opposite sides in the first direction D1 are opened, is illustrated with the assumption that a direction, in which the combustion gas flows, is the first direction D1 or an opposite direction to the first direction D1, the present disclosure is not limited thereto.

As an example, in a top-down boiler, a burner 300 may be disposed in an opposite direction to the first direction D1 of the combustion chamber, and a heat exchanger may be disposed in the first direction D1 of the combustion chamber. The heat and the combustion gas generated in the burner 300 may be delivered to the insulating pipe 210 through the combustion chamber.

The burner 300 may be provided in an interior of the heat exchange assembly 200 to form a combustion reaction in the combustion chamber.

The mixing chamber 400 may be connected to the burner 300 such that air and combustion gas are mixed and supplied to the burner 300. The mixing chamber 400 may be coupled to the burner 300 and the heat exchange assembly 200. The mixing chamber 400 may be coupled to the heat exchange assembly 200 after being coupled to the burner 300. A partial area of the mixing chamber 400 may be formed to be opened.

The combustion chamber assembly 100 may include a burner packing member 310 that is configured to pack a space between the mixing chamber 400 and the burner 300, and an inner packing member 500 and an outer packing member 600 that are configured to pack a space between the mixing chamber 400 and the heat exchange assembly 200.

Furthermore, the combustion chamber assembly 100 may include a coupling member F that couples the burner 300 and the mixing chamber 400 or couples the heat exchange assembly 200 and the mixing chamber 400.

FIG. 3 is an exploded perspective view of a burner, a burner packing member, a mixing chamber, and a fixing member according to an embodiment of the present disclosure. FIG. 4 is an exploded perspective view of a heat exchange assembly, a mixing chamber, to which the burner is coupled, an inner packing member, an outer packing member, and a coupling member according to an embodiment of the present disclosure.

Referring to FIGS. 3 and 4, the burner 300 may be coupled to the mixing chamber 400. The burner 300 may be coupled to the mixing chamber 400 on a side of the mixing chamber 400 in the first direction D1.

The burner 300 may be formed in a rectangular shape when viewed in a state, in which it is spaced apart in the first direction D1. The burner 300 may be coupled to the mixing chamber 400 through a circumferential area of the burner 300.

A burner packing member 310 may be provided between the burner 300 and the mixing chamber 400. The burner packing member 310 may be disposed between the burner 300 and the mixing chamber 400 and may extend along a circumferential direction of the burner 300. The burner packing member 310 may seal a space between the burner 300 and the mixing chamber 400. The burner packing member 310 may be provided between the burner 300 and the mixing chamber 400 and may be configured to seal a space between the burner 300 and the mixing chamber 400.

More specifically, the burner 300 may include a burner flange area 301 that is coupled to the mixing chamber 400. The burner flange area 301 may be provided on an outer side of the burner 300, and may extend along a circumference of the rectangular shape. The burner packing member 310 may seal a space between the mixing chamber 400 and the burner flange area 301.

When the burner packing member 310 is disposed between the burner 300 and the mixing chamber 400 and the burner 300 and the mixing chamber 400 are completely coupled to each other as in FIG. 3, the mixing chamber 400, on which the burner 300 is mounted, may be coupled to the heat exchange assembly 200 as in FIG. 4.

In this case, an inner packing member 500 and an outer packing member 600 may be provided between the mixing chamber 400 and the heat exchange assembly 200. The inner packing member 500 and the outer packing member 600 may have shapes that extend along a circumference of a rectangular shape.

The inner packing member 500 may primarily seal an interior space of the heat exchange assembly 200, and the outer packing member 600 may secondarily seal the interior space of the heat exchange assembly 200. The inner packing member 500 may be formed of graphite. The outer packing member 600 may be formed of silicon.

FIG. 5 is a bottom perspective view of a mixing chamber according to an embodiment of the present disclosure. FIG. 6 is an enlarged view of FIG. 5.

Referring to FIGS. 5 and 6, the mixing chamber 400 may include a burner coupling area 410 coupled to the burner 300 that is coupled to the burner 300 (see FIG. 3), and an assembly coupling area 420 that is provided on an outer side of the burner coupling area 410 in the circumferential direction, and is coupled to the heat exchange assembly 200.

The burner coupling area 410 may be provided on an inner side of the assembly coupling area 420 in a circumferential direction. The burner coupling area 410 may extend along a circumference of a rectangular shape. The assembly coupling area 420 may also extend along a circumference of a rectangular shape.

The burner coupling area 410 may contact the burner flange area 301 (see FIG. 3) of the burner 300, and may be coupled to the burner 300 by the coupling member F inserted from a side of the burner 300 in the first direction D1. The burner coupling area 410 and the burner flange area 301 may face each other and may be coupled to each other by the coupling member F.

The assembly coupling area 420 may contact the heat exchange assembly 200, and may be coupled to the heat exchange assembly 200 by the coupling member F inserted from a side of the assembly coupling area 420 in an opposite direction to the first direction D1.

The mixing chamber 400 may further include a guide rib 430 that protrudes from the burner coupling area 410 toward an interior of the heat exchange assembly 200. A plurality of guide ribs 430 may be provided.

The plurality of guide ribs 430 may be located at corners of the burner coupling area 410 in a circumferential direction. As an example, four guide ribs 430 may be provided to be disposed at four corners of the mixing chamber 400.

Each of the plurality of guide ribs 430 may include a first rib area 440 and a second rib area 450. The first rib area 440 and the second rib area 450 may extend in crossing directions. The first rib area 440 and the second rib area 450 may be integrally formed.

The guide rib 430 may include a rib surface 431 that faces an outside of the mixing chamber 400 in a circumferential direction. The first rib area 440 may include a first rib surface 441, and the second rib area 450 may include a second rib surface 451.

Meanwhile, the mixing chamber 400 may include a burner packing fixing rib 402 that is disposed on an inner side of the circumferential direction of the burner coupling area 410, and that defines a burner packing groove 401 for inserting the burner packing member 310 together with the burner coupling area 410.

The burner packing groove 401 may be formed concavely on one surface of the mixing chamber 400, which faces the burner 300. The burner packing fixing rib 402 may protrude from one surface of the mixing chamber 400 toward the burner 300.

The burner packing fixing rib 402 may extend along a circumference of a rectangular shape on an inner side of the burner coupling area 410 in a circumferential direction, and the burner packing groove 401 formed between the burner packing fixing rib 402 and the burner coupling area 410 may also extend along the circumference of the rectangular shape. The burner packing member 310 may be inserted into the burner packing groove 401.

FIG. 7 is a longitudinal sectional view of the combustion chamber assembly. FIG. 8 is an enlarged view of FIG. 7. FIG. 9 is a longitudinal sectional view of the combustion chamber assembly on a different plane from that of FIG. 8.

Referring to FIGS. 7 to 9, a burner packing member 310 may be provided between the burner flange area 301 of the burner 300 and the burner coupling area 410 of the mixing chamber 400. The burner packing member 310 may be inserted into the burner packing groove 401 provided between the burner coupling area 410 of the mixing chamber 400 and the burner packing fixing rib 402 to contact the burner flange area 301.

The burner packing member 310 may be formed of a material that is compressible or heat-resistant. As an example, the burner packing member 310 may be formed of graphite. The burner packing member 310 may be fixed in position while being compressed by the burner packing fixing rib 402 and the burner coupling area 410.

The burner packing member 310 may contact the burner flange area 301, and may be covered by the burner flange area 301. The burner packing groove 401 may be covered by the burner flange area 301.

Accordingly, the burner flange area 301 may support the burner packing member 310 while being coupled to the burner coupling area 410. The burner packing member 310 may be disposed on an inner side of the burner coupling area 410 in the circumferential direction to contact the burner flange area 301, and may seal a space between the burner 300 and the mixing chamber 400.

In particular, the burner packing member 310 may improve gas-tightness between the burner 300 and the mixing chamber 400 as the burner flange area 301 and the burner coupling area 410 are coupled to each other by the coupling member F.

According to the structure, the burner packing member 310 may improve safety of the combustion chamber assembly 100 because the gas mixed in an interior of the mixing chamber 400 may be prevented from being discharged to an outside of the mixing chamber 400 while not flowing toward the burner 300.

Furthermore, the burner packing member 310 prevents the gas mixed in an interior of the mixing chamber 400 from being discharged to an outside of the mixing chamber 400, but the inner packing member 500 and the outer packing member 600 may additionally prevent the gas that may be discharged from the interior of the mixing chamber 400 in spite of the configuration of the burner packing member 310 from being discharged to an outside of the combustion chamber assembly 100, and may prevent combustion gas accommodated in the combustion chamber from being discharged to an outside of the combustion chamber assembly 100.

The heat exchange assembly 200 may include an inner wall 230 that defines the combustion chamber. The inner wall 230 may include an inner wall surface 231 that faces the second direction D2, an opposite direction to the second direction D2, the third direction D3, and an opposite direction to the third direction D3. The inner wall surface 231 may be a surface of the inner wall 230 that defines the combustion chamber.

The guide rib 430 may be spaced apart from two inner walls 230 that are adjacent to the guide rib 430. The rib surface 431 of the guide rib 430 may face the inner wall surface 231.

More specifically, the first rib surface 441 of the first rib area 440 shown in FIG. 6 may be spaced apart from the inner wall surface 231 that the first rib surface 441 faces. In addition, the rib surface 451 of the second rib area 450 may be spaced apart from the inner wall surface 231 that the rib surface 451 faces.

Each of the plurality of guide ribs 430 may be spaced apart from the inner wall 230 that is adjacent to the guide rib 430.

That is, the plurality of guide ribs 430 may be disposed between the four inner walls 230. When the mixing chamber 400 is not seated in a right position of the heat exchange assembly 200, at least one of the plurality of guide ribs 430 may contact the heat exchange assembly 200.

Then, because the user may perceive that the mixing chamber 400 is not seated in a right position of the heat exchange assembly 200, the mixing chamber 400 may be moved such that all of the plurality of guide ribs 430 are inserted into an interior of the heat exchange assembly 200.

Meanwhile, the heat exchange assembly 200 may include a flange area 240 that extends from the inner wall 230 in an outward direction of the heat exchange assembly 200. The flange area 240 may extend horizontally from the inner wall 230. The flange area 240 may extend, respectively, from the four inner walls 230 in the second direction D2, an opposite direction to the second direction D2, the third direction D3, and an opposite direction to the third direction D3. The flange area 240 may be a portion that is coupled to the assembly coupling area 420.

The flange area 240 may include a support area 250 that is coupled to the inner wall 230, and a cover area 260 that extends from the support area 250 toward the assembly coupling area 420.

The support area 250 may connect the inner wall 230 and the cover area 260. The outer packing member 600 and the inner packing member 500 may be seated on the support area 250. The cover area 260 may cover an outer side of the outer packing member 600.

That is, the support area 250 may support the inner packing member 500 and the outer packing member 600, and the cover area 260 may cover one side of the outer packing member 600.

In another expression, the inner packing member 500 and the outer packing member 600 may be provided between the flange area 240 and the assembly coupling area 420. The inner packing member 500 may be located on an inner side of the outer packing member 600 in a direction that is perpendicular to a circumferential direction of the outer packing member 600, and may be disposed between the flange area 240 and the assembly coupling area 420.

Meanwhile, the inner packing member 500 and the outer packing member 600 need to be spaced apart from each other. It is because when the inner packing member 500 and the outer packing member 600 contact each other, a temperature of the inner packing member 500 rises due to a temperature of an interior of the combustion chamber, so that a temperature of the outer packing member 600 may also rise.

To prevent this, the inner packing member 500 and the outer packing member 600 may be spaced apart from each other. Furthermore, the assembly coupling area 420 may include an outer fixing rib 422 and an inner fixing rib 423 as a structure for fixing spacing positions of the inner packing member 500 and the outer packing member 600.

The outer fixing rib 422 may extend from a support surface 421 that faces the support area 250 of the assembly coupling area 420 between the inner packing member 500 and the outer packing member 600.

The inner fixing rib 423 may extend from the support surface 421 to an inner side of the circumferential direction of the inner packing member 500. The inner fixing rib 423 may fix the inner packing member 500.

According to the structure, the inner fixing rib 423 and the outer fixing rib 422 may guide a position of the inner packing member 500, and the outer fixing rib 422 and the cover area 260 may guide a position of the outer packing member 600.

The outer packing member 600 may be spaced apart from the cover area 260. A distance between the outer packing member 600 and the cover area 260 may be smaller than a distance between the guide rib 430 and the inner wall 230.

More specifically, a first spacing distance SD1 between the guide rib 430 and the inner wall 230 may be smaller than a second spacing distance SD2 between the cover area 260 and the outer packing member 600.

Here, the first spacing distance SD1 between the guide rib 430 and the inner wall 230 may be defined as a spaced distance between the rib surface 431 and the inner wall surface 231 that the rib surface 431 faces.

According to the structure, the guide rib 430 may contact the inner wall 230 easier when the mixing chamber 400 is coupled to the heat exchange assembly 200 than when the outer packing member 600 contacts the cover area 260. Accordingly, because the guide rib 430 contacts the inner wall 230 before the outer packing member 600 contacts the cover area 260, the outer packing member 600 may be prevented from being damaged by the cover area 260.

Furthermore, a distance L1 between an outer surface 261 that faces an outer side of the cover area 260 in a circumferential direction, and the guide rib 430 may be greater than a distance L2 between the outer surface 261 of the cover area 260 and the inner wall surface 231 of the inner wall 230.

According to the structure, the guide rib 430 may be configured to be inserted into an interior of the heat exchange assembly 200 when the mixing chamber 400 is coupled to the heat exchange assembly 200.

The guide rib 430 may protrude toward the heat exchange assembly 200 from an inner surface 411 of the burner coupling area 410, which faces an interior of the heat exchange assembly 200. The guide rib 430 may protrude further toward an interior of the heat exchange assembly 200 than the inner fixing rib 423.

As shown in FIG. 9, a first height H1 between one end of the guide rib 430, which faces the first direction D1, and the inner fixing rib 423 may be formed to be greater than a second height H2 of the cover area 260 in the first direction D1.

According to the structure, the guide rib 430 may contact the support area 250 first before the outer packing member 600 contacts one end of the cover area 260, even though a position of the mixing chamber 400 is misaligned when the mixing chamber 400, to which the outer packing member 600 is fixed, is coupled to the heat exchange assembly 200.

Accordingly, the outer packing member 600 may be prevented from being damaged by the cover area 260 even though a position of the mixing chamber 400 is misaligned when the mixing chamber 400, to which the outer packing member 600 is fixed, is coupled to the heat exchange assembly 200.

As described above, when a position of the mixing chamber 400 with respect to the heat exchange assembly 200 is guided by the guide rib 430, among the coupling members F, a coupling member F that couples the heat exchange assembly 200 and the mixing chamber 400 may pass through the assembly coupling area 420, the flange area 240, and the outer packing member 600 together.

Accordingly, a coupling between the heat exchange assembly 200 and the mixing chamber 400 may be completed.

According to the above-described principle, when a coupling between the mixing chamber 400 and the heat exchange assembly 200 is completed, a manufacture of the combustion chamber assembly 100 (see FIG. 1) may be completed.

According to an embodiment of the present disclosure, because a right position of the mixing chamber may be guided by the guide rib when the mixing chamber is coupled to the heat exchange assembly, productivity of the combustion chamber assembly may be improved.

Furthermore, according to an embodiment of the present disclosure, because the spacing distance between the guide rib and the inner wall is smaller than the spacing distance between the cover area and the outer packing member, the outer packing member may be prevented from being damaged when the mixing chamber is coupled to the heat exchange assembly.

Furthermore, because the guide rib may contact the support area of the heat exchange assembly before the outer packing member contacts the cover area of the heat exchange assembly when the mixing chamber is coupled to the heat exchange assembly, the outer packing member may be prevented from being damaged.

Furthermore, according to an embodiment of the present disclosure, because the burner packing member is provided between the burner and the mixing chamber, gas mixed in an interior of the mixing chamber may be prevented from being discharged between the mixing chamber and the burner.

Furthermore, according to an embodiment of the present disclosure, because gas that may be discharged from an interior of the mixing chamber may be additionally prevented from being discharged to an outside of the combustion chamber assembly in spite of a configuration of the burner packing member due to configurations of the inner packing member and the outer packing member, the combustion gas accommodated in the combustion chamber may be prevented from being discharged to an outside of the combustion chamber assembly.

The above description is merely an example of the technical idea of the present disclosure, and various modifications and variations may be made by one skilled in the art without departing from the essential characteristic of the present disclosure. Accordingly, embodiments of the present disclosure are intended not to limit but to explain the technical idea of the present disclosure, and the scope and spirit of the present disclosure is not limited by the above embodiments. The scope of protection of the present disclosure should be construed by the attached claims, and all equivalents thereof should be construed as being included within the scope of the present disclosure.