Combustion chamber structure and gas water heater

Abstract

This utility model belongs to the field of water heater technology, specifically disclosing a combustion chamber structure and a gas water heater. The combustion chamber structure includes a combustion chamber shell and an air jet pipe connected to each other. The combustion chamber shell has an air inlet. At least one of the combustion chamber shell and the air jet pipe has a sealing ring positioning structure, which surrounds the outer periphery of the air inlet. The sealing ring positioning structure is configured to position the sealing ring and limit its compression. The air jet pipe is connected to the combustion chamber shell by fasteners and presses against the sealing ring to block the air inlet. The air outlet of the air jet pipe is connected to the air inlet. The combustion chamber structure disclosed in this utility model enables the assembly dimensions between the air jet pipe and the combustion chamber shell to be unaffected by the initial dimensions, compression, and tightening force of the sealing element, thereby improving the sealing performance and combustion performance of the gas water heater.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to combustion chamber structure and gas water heater. Background Technology

[0002] Forced-draft gas water heaters refer to gas water heaters where the blower is located below the burner. Combustion is achieved through forced oxygen supply from the blower, resulting in more complete combustion. Since the blower needs to supply oxygen to the combustion system, the sealing performance of the combustion system significantly impacts combustion performance. Therefore, sealing strips are added during the assembly of the jet pipe and combustion chamber to ensure a tight seal. Existing technology provides a gas water heater where the sealing strip is directly adhered to the combustion chamber, and then the jet pipe is pressed onto the sealing strip and secured with screws. Due to variations in the age of the sealing strips and the tension of the fixing screws, the compression of the sealing strips varies, leading to dimensional discrepancies in the assembly of the jet pipe and combustion chamber. Furthermore, the consistent placement of the sealing strips affects the overall sealing performance of the combustion system. Utility Model Content

[0003] The first technical problem solved by this utility model is to provide a combustion chamber structure that can solve the problem that the compression of the sealing cotton strip installed in existing gas water heaters is difficult to fix, resulting in dimensional deviations in the assembly of the jet pipe and the combustion chamber, which affects the overall sealing performance of the combustion system.

[0004] The second technical problem solved by this utility model is to provide a gas water heater whose combustion chamber structure can reduce the assembly size deviation between the jet pipe and the combustion chamber, thereby improving the combustion performance of the gas water heater.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A combustion chamber structure is provided, including a combustion chamber housing and an injection pipe connected to each other. The combustion chamber housing has an air inlet. At least one of the combustion chamber housing and the injection pipe has a sealing ring positioning structure. The sealing ring positioning structure is arranged around the outer periphery of the air inlet. The sealing ring positioning structure is configured to position the sealing ring and limit the compression of the sealing ring. The injection pipe is connected to the combustion chamber housing by fasteners and presses against the sealing ring to block the air inlet. The air outlet of the injection pipe is in communication with the air inlet.

[0007] Compared with the prior art, the combustion chamber structure of this utility model has the following advantages: at least one of the combustion chamber shell and the jet pipe has a sealing ring positioning structure. The sealing ring positioning structure is arranged around the outer periphery of the air intake and is configured to position the sealing ring and limit its compression. By limiting the position of the sealing ring and restricting its compression through the sealing ring positioning structure, the compression of the sealing ring is controllable when the jet pipe is connected to the combustion chamber shell by fasteners and presses against the sealing ring. The assembly dimensions between the jet pipe and the combustion chamber shell are not affected by the initial size and compression of the sealing ring, nor by the tightening force of the fasteners, thus ensuring the assembly accuracy and sealing performance of the combustion chamber structure. Moreover, the position of the sealing ring on the outer periphery of the air intake is constrained by the sealing ring positioning structure, ensuring the consistency of the sealing ring positions on multiple different combustion chamber structures and improving the assembly reliability of the combustion chamber structure.

[0008] In one embodiment, the sealing ring positioning structure is a sealing groove, which is formed around the air inlet. The depth of the sealing groove is less than the height of the uncompressed sealing ring, and there is a reserved gap between the side wall of the sealing groove and the uncompressed sealing ring along the width direction of the sealing groove. The reserved gap is greater than or equal to the width deformation of the sealing ring when it is compressed to be flush with the top of the sealing groove.

[0009] In one embodiment, the sealing groove is in communication with the air inlet; or,

[0010] The sealing groove is spaced apart from the air inlet.

[0011] In one embodiment, the maximum depth of the sealing groove is H1, and the thickness of the sealing ring is H2, where H1+2mm≤H2≤2*H1. In one embodiment, the sealing ring positioning structure includes a first convex ring, which is disposed around the periphery of the air inlet. The height of the first convex ring is less than the height of the uncompressed sealing ring, and the sealing ring is fitted around the outer periphery of the first convex ring or embedded in the inner periphery of the first convex ring.

[0012] In one embodiment, the sealing ring positioning structure further includes a second convex ring, which is concentrically arranged with the first convex ring. The sealing ring is sandwiched between the second convex ring and the first convex ring, and the distance between the second convex ring and the first convex ring is greater than or equal to the width of the sealing ring when it is compressed to be flush with the top of the first convex ring; and / or,

[0013] The height of the first convex ring is H, and the thickness of the sealing ring is H2, where H3+2mm≤H2≤2*H3.

[0014] In one embodiment, the combustion chamber housing has a first mounting hole, the jet pipe has a second mounting hole corresponding to the first mounting hole, and the fastener passes through and is connected to the first mounting hole and the second mounting hole.

[0015] In one embodiment, multiple first mounting holes and multiple second mounting holes are provided, with each of the multiple first mounting holes and the multiple second mounting holes corresponding one-to-one, and the multiple first mounting holes are spaced apart around the periphery of the air inlet.

[0016] In one embodiment, the cross-sectional shape of the sealing ring perpendicular to the length direction is rectangular, or the cross-sectional shape of the sealing ring perpendicular to the length direction is circular.

[0017] The second technical problem mentioned above is solved by the following technical solution:

[0018] A gas water heater is provided, including the combustion chamber structure as described in any of the above embodiments.

[0019] Compared with the prior art, the gas water heater of this utility model has the following advantages: through the combustion chamber structure described above, the assembly dimensions between the jet pipe and the combustion chamber shell are not affected by the initial dimensions and compression of the sealing components, nor by the tightening force. The combustion chamber structure has better assembly accuracy and sealing performance, thereby improving the combustion performance of the gas water heater. Attached Figure Description

[0020] Figure 1 This is a structural disassembly diagram of the combustion chamber structure provided in an embodiment of the present utility model;

[0021] Figure 2 for Figure 1 A magnified schematic diagram of a portion of the structure in section A.

[0022] Figure 3 A front view of the combustion chamber shell provided in an embodiment of this utility model;

[0023] Figure 4 A cross-sectional view of the sealing ring positioning structure provided in the embodiment of this utility model. Figure 1 ;

[0024] Figure 5 A cross-sectional view of the sealing ring positioning structure provided in the embodiment of this utility model. Figure 2 ;

[0025] Figure 6 A cross-sectional view of the sealing ring positioning structure provided in the embodiment of this utility model. Figure 3 ;

[0026] Figure 7 A cross-sectional view of the sealing ring positioning structure provided in the embodiment of this utility model. Figure 4 ;

[0027] Figure 8 A cross-sectional view of the sealing ring positioning structure provided in the embodiment of this utility model. Figure 5 .

[0028] Label Explanation:

[0029] 1. Combustion chamber shell; 11. Air inlet; 12. First mounting hole; 2. Injection pipe; 21. Mounting base; 22. Second mounting hole; 3. Sealing ring; 31. Sealing groove; 32. First convex ring; 33. Second convex ring; 4. Fastener. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] like Figures 1 to 3 As shown, this embodiment of the invention first provides a combustion chamber structure, which includes a combustion chamber shell 1 and an injection pipe 2 connected to each other. The combustion chamber shell 1 has an air inlet 11. At least one of the combustion chamber shell 1 and the injection pipe 2 has a sealing ring positioning structure, which surrounds the outer periphery of the air inlet 11 and is configured to position the sealing ring 3 and limit its compression. The injection pipe 2 is connected to the combustion chamber shell 1 by fasteners 4 and presses against the sealing ring 3 to seal the air inlet 11, ensuring the airtightness of the connection between the combustion chamber shell 1 and the injection pipe 2 and preventing gas leakage around the air inlet 11. The outlet of the injection pipe 2 communicates with the air inlet 11, supplying fuel gas into the combustion chamber shell 1.

[0035] The combustion chamber structure provided in this embodiment defines the position of the sealing ring 3 by a sealing ring positioning structure and limits the compression of the sealing ring 3. This ensures that when the jet pipe 2 is connected to the combustion chamber housing 1 by the fastener 4 and presses against the sealing ring 3, the compression of the sealing ring 3 is controllable. The assembly dimensions between the jet pipe 2 and the combustion chamber housing 1 are not affected by the initial size or compression of the sealing ring 3, nor by the tightening force of the fastener 4, thus ensuring the assembly accuracy and sealing performance of the combustion chamber structure. Furthermore, the sealing ring 3 is constrained at the outer periphery of the air inlet 11 by the sealing ring positioning structure, ensuring the consistency of the sealing ring 3 positions on multiple different combustion chamber structures and improving the assembly reliability of the combustion chamber structure.

[0036] The sealing ring positioning structure can be implemented in various ways. For example, the sealing ring positioning structure is a sealing groove 31, which is formed around the periphery of the air inlet 11. The depth of the sealing groove 31 is less than the height of the uncompressed sealing ring 3, and a reserved gap exists between the sidewall of the sealing groove 31 and the uncompressed sealing ring 3 along the width direction of the sealing groove 31. Furthermore, the reserved gap is greater than or equal to the width deformation of the sealing ring 3 when compressed to be flush with the top of the sealing groove 31. Figure 4 As shown in the figure, H4 is the reserved gap between the side wall of the sealing groove 31 and the uncompressed sealing ring 3. When the sealing ring 3 is compressed to be flush with the top of the sealing groove 31, the width of the sealing ring 3 will increase. The reserved gap H4 is greater than or equal to this increase in width, ensuring that the sealing groove 31 can accommodate the sealing ring 3 when compressed to be flush with the top of the sealing groove 31. The sealing groove 31 can be formed on the combustion chamber housing 1 or on the jet pipe 2.

[0037] Specifically, in one embodiment, the sealing groove 31 is spaced apart from the air inlet 11 and surrounds the periphery of the air inlet 11. For example... Figure 4As shown, taking the sealing groove 31 formed in the combustion chamber housing 1 as an example, the outer surface of the combustion chamber housing 1 is recessed to form the sealing groove 31. This grooving method is relatively simple, and the recess on the outer surface of the combustion chamber housing 1 can be formed by applying pressure. The sealing ring 3 is embedded in the sealing groove 31 and surrounds the periphery of the air intake 11. When the jet pipe 2 is connected to the combustion chamber housing 1 by the fastener 4, the jet pipe 2 compresses the sealing ring 3 to form a good seal.

[0038] In another embodiment, such as Figure 5 As shown, the sealing groove 31 is connected to the air inlet 11. The sealing ring 3 is embedded in the sealing groove 31, and the inner circumference of the sealing ring 3 is the same as the circumference of the air inlet 11. When the jet pipe 2 is connected to the combustion chamber housing 1 by the fastener 4, the jet pipe 2 can also form a good seal by compressing the sealing ring 3.

[0039] The depth of the sealing groove 31 determines the compression amount of the sealing ring 3. A suitable compression amount of the sealing ring 3 is necessary to achieve better sealing performance. The depth of the sealing groove 31 is H1, and the thickness of the uncompressed sealing ring 3 is H2. H1 + 2mm ≤ H2 ≤ 2*H1. Thus, when the sealing ring 3 is uncompressed, its thickness protrudes from the sealing groove 31 by more than 2mm, but does not exceed half the thickness of the sealing ring 3 itself. This avoids insufficient compression affecting sealing performance and also prevents the sealing ring 3 from being too thick, which would affect the sealing groove 31's limitation on the compression amount of the sealing ring 3.

[0040] The shape of the sealing groove 31 is adapted to the shape of the air inlet 11, such as... Figures 1 to 3 As shown in the figure, the air inlet 11 is a rectangular opening, and correspondingly, the sealing groove 31 is a rectangular annular groove. In other embodiments, depending on the shape of the jet pipe 2, the air inlet 11 can be a circular opening, and the sealing groove 31 is correspondingly formed as an annular groove, not limited to the figures of this embodiment. Accordingly, the shape of the sealing ring 3 is adapted to the shape of the sealing groove 31. The sealing ring 3 can be made of high-performance foam such as polyurethane or polyethylene, or high-temperature resistant polymer compounds such as fluororubber or silicone rubber, suitable for high-temperature working environments.

[0041] Regarding the sealing ring positioning structure, in other embodiments, there is another implementation where the sealing ring positioning structure includes a first convex ring 32, which is arranged around the periphery of the air inlet 11. The height of the first convex ring 32 is less than the height of the uncompressed sealing ring 3. The sealing ring 3 is sleeved on the outer periphery of the first convex ring 32 or embedded in the inner periphery of the first convex ring 32. The following description takes the sealing ring positioning structure being installed in the combustion chamber housing 1 as an example. Figure 6 As shown, the sealing ring 3 is fitted around the outer periphery of the first convex ring 32; as Figure 7As shown, the sealing ring 3 is embedded in the inner circumference of the first convex ring 32, and the first convex ring 32 can constrain the installation position of the sealing ring 3. During installation, the jet pipe 2 abuts against the top of the first convex ring 32 and compresses the sealing ring 3 to form an effective seal.

[0042] In another embodiment, to further constrain the sealing ring 3, the sealing ring positioning structure also includes a second convex ring 33, such as... Figure 8 As shown. The second convex ring 33 and the first convex ring 32 are concentrically arranged, and the distance between the second convex ring 33 and the first convex ring 32 is greater than the width of the uncompressed sealing ring 3. The sealing ring 3 is sandwiched between the second convex ring 33 and the first convex ring 32. Figure 8 The H5 shown is the value that the distance between the second convex ring 33 and the first convex ring 32 is greater than the width of the uncompressed sealing ring 3.

[0043] When the protrusion heights of the second protruding ring 33 and the first protruding ring 32 are the same, H5 is greater than or equal to the width deformation of the sealing ring 3 when it is compressed to be flush with the tops of the second protruding ring 33 and the first protruding ring 32, ensuring that the sealing ring 3 can be accommodated between the second protruding ring 33 and the first protruding ring 32 when compressed to be flush with the top. The jet pipe 2 simultaneously abuts against the tops of the first protruding ring 32 and the tops of the second protruding ring 33 to compress the sealing ring 3 and form a seal. Moreover, the second protruding ring 33 and the first protruding ring 32 with the same protrusion height increase the contact area between the jet pipe 2 and the sealing ring positioning structure, resulting in better sealing performance.

[0044] When the protrusion heights of the second protruding ring 33 and the first protruding ring 32 are not the same, the protrusion height of the second protruding ring 33 can be made smaller than the protrusion height of the first protruding ring 32, and the compression amount of the sealing ring 3 is determined by the protrusion height of the first protruding ring 32. At this time, the amount of change in the width direction of the compressed sealing ring 3 is also determined by the protrusion height of the first protruding ring 32. Figure 8 The H5 shown needs to be greater than or equal to the width deformation when the sealing ring 3 is compressed to be flush with the top of the first convex ring 32.

[0045] In one embodiment, the height of the first convex ring 32 is H3, and the thickness of the uncompressed sealing ring 3 is H2, where H3 + 2mm ≤ H2 ≤ 2*H3. Thus, when the sealing ring 3 is uncompressed, its thickness protrudes beyond the first convex ring 32 by more than 2mm, but not exceeding half the thickness of the sealing ring 3 itself. This avoids both insufficient compression affecting sealing performance and excessive thickness of the sealing ring 3 affecting the first convex ring 32's limitation on the compression of the sealing ring 3.

[0046] The combustion chamber housing 1 has a first mounting hole 12, and the jet pipe 2 has a second mounting hole 22, corresponding to the first mounting hole 12. Fasteners 4 pass through and connect to both the first mounting hole 12 and the second mounting hole 22. For ease of installation, fasteners 4 are sequentially inserted from one side of the jet pipe 2 into the second mounting hole 22 and the first mounting hole 12. Fasteners 4 are screws. The second mounting hole 22 can be a smooth hole, while the first mounting hole 12 is a threaded hole.

[0047] To increase the installation reliability of fasteners 4, multiple first mounting holes 12 and multiple second mounting holes 22 are provided. The multiple first mounting holes 12 and multiple second mounting holes 22 correspond one-to-one, and the multiple first mounting holes 12 are spaced apart around the periphery of the air intake 11. Multiple fasteners 4 are respectively inserted through and connected to the first mounting holes 12 and the second mounting holes 22, forming multiple assembly connection points between the combustion chamber housing 1 and the jet pipe 2 around the periphery of the air intake 11. The jet pipe 2 exerts relatively uniform pressure on the sealing ring 3, ensuring consistent sealing of the air intake 11 throughout its entire periphery.

[0048] To better position and install the jet nozzle 2, the jet nozzle 2 has a mounting base 21, which is used to connect to the combustion chamber housing 1. The jet nozzle 2 is installed from the outside of the combustion chamber housing 1 towards the outer surface of the housing, making assembly relatively simple. A second mounting hole 22 is provided on the mounting base 21. During assembly, the sealing ring 3 can be installed in the sealing groove 31 of the combustion chamber housing 1 first, and then the jet nozzle 2 can be moved from the outside of the combustion chamber housing 1 towards the sealing ring 3 until it abuts against the outer surface of the combustion chamber housing 1 and compresses the sealing ring 3. Finally, the multiple fasteners 4 are tightened.

[0049] The cross-sectional shape of sealing ring 3 is adapted to the sealing ring positioning structure. The cross-sectional shape of sealing ring 3 perpendicular to its length direction is rectangular, such as... Figure 1 As shown, or, the cross-sectional shape of the sealing ring 3 perpendicular to the length direction is circular.

[0050] This utility model embodiment also provides a gas water heater, which includes the combustion chamber structure as described above. The combustion chamber structure includes a combustion chamber shell 1 and an air jet pipe 2 connected to each other. The combustion chamber shell 1 has an air inlet 11. At least one of the combustion chamber shell 1 and the air jet pipe 2 has a sealing ring positioning structure. The sealing ring positioning structure is arranged around the outer periphery of the air inlet 11 and is configured to position the sealing ring 3 and limit the compression of the sealing ring 3. The air jet pipe 2 is connected to the combustion chamber shell 1 by fasteners 4 and presses against the sealing ring 3 to block the air inlet 11, ensuring the sealing of the connection between the combustion chamber shell 1 and the air jet pipe 2 and preventing gas leakage around the air inlet 11. The air outlet of the air jet pipe 2 is connected to the air inlet 11, supplying gas to the combustion chamber shell 1. By positioning the sealing ring 3 using the sealing ring positioning structure and limiting its compression, the compression of the sealing ring 3 is controllable when the jet pipe 2 is connected to the combustion chamber shell 1 via the fastener 4 and presses against the sealing ring 3. The assembly dimensions between the jet pipe 2 and the combustion chamber shell 1 are not affected by the initial dimensions or compression of the sealing ring 3, nor by the tightening force of the fastener 4, thus ensuring the assembly accuracy and sealing performance of the combustion chamber structure. Furthermore, the sealing ring 3 is constrained at the outer periphery of the air inlet 11 by the sealing ring positioning structure, ensuring the consistency of the sealing ring 3 positions on multiple different combustion chamber structures, improving the assembly accuracy and sealing performance of the combustion chamber structure, and thereby improving the combustion performance of the gas water heater.

[0051] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0052] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A combustion chamber structure, characterized in that, The device includes a combustion chamber housing (1) and an injection pipe (2) connected to each other. The combustion chamber housing (1) has an air inlet (11). At least one of the combustion chamber housing (1) and the injection pipe (2) has a sealing ring positioning structure. The sealing ring positioning structure is arranged around the outer periphery of the air inlet (11). The sealing ring positioning structure is configured to position a sealing ring (3) and limit the compression of the sealing ring (3). The injection pipe (2) is connected to the combustion chamber housing (1) by a fastener (4) and presses against the sealing ring (3) to block the air inlet (11). The air outlet of the injection pipe (2) is connected to the air inlet (11).

2. The combustion chamber structure according to claim 1, characterized in that, The sealing ring positioning structure is a sealing groove (31), which is opened around the air inlet (11). The depth of the sealing groove (31) is less than the height of the uncompressed sealing ring (3), and there is a reserved gap between the side wall of the sealing groove (31) and the uncompressed sealing ring (3) along the width direction of the sealing groove (31). The reserved gap is greater than or equal to the width deformation of the sealing ring (3) when it is compressed to be flush with the top of the sealing groove (31).

3. The combustion chamber structure according to claim 2, characterized in that, The sealing groove (31) is connected to the air inlet (11); or, The sealing groove (31) is spaced apart from the air inlet (11).

4. The combustion chamber structure according to claim 2, characterized in that, The maximum depth of the sealing groove (31) is H1, and the thickness of the sealing ring (3) is H2, where H1+2mm≤H2≤2*H1.

5. The combustion chamber structure according to claim 1, characterized in that, The sealing ring positioning structure includes a first convex ring (32), which is arranged around the periphery of the air inlet (11). The height of the first convex ring (32) is less than the height of the uncompressed sealing ring (3). The sealing ring (3) is sleeved on the outer periphery of the first convex ring (32) or embedded in the inner periphery of the first convex ring (32).

6. The combustion chamber structure according to claim 5, characterized in that, The sealing ring positioning structure further includes a second convex ring (33), which is concentrically arranged with the first convex ring (32). The sealing ring (3) is sandwiched between the second convex ring (33) and the first convex ring (32). The distance between the second convex ring (33) and the first convex ring (32) is greater than or equal to the width of the sealing ring (3) when it is compressed to be flush with the top of the first convex ring (32); and / or, The height of the first convex ring (32) is H3, and the thickness of the sealing ring (3) is H2, where H3+2mm≤H2≤2*H3.

7. The combustion chamber structure according to claim 1, characterized in that, The combustion chamber housing (1) has a first mounting hole (12), the jet pipe (2) has a second mounting hole (22), the second mounting hole (22) corresponds to the first mounting hole (12), and the fastener (4) passes through and is connected to the first mounting hole (12) and the second mounting hole (22).

8. The combustion chamber structure according to claim 7, characterized in that, Multiple first mounting holes (12) are provided, and multiple second mounting holes (22) are provided. The multiple first mounting holes (12) and multiple second mounting holes (22) correspond one-to-one. The multiple first mounting holes (12) are arranged at intervals around the periphery of the air inlet (11).

9. The combustion chamber structure according to any one of claims 1-8, characterized in that, The sealing ring (3) has a rectangular cross-sectional shape perpendicular to its length direction, or the sealing ring (3) has a circular cross-sectional shape perpendicular to its length direction.

10. A gas-fired water heater, characterized in that, Includes the combustion chamber structure as described in any one of claims 1-9.

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