A gas water heater

Abstract

This application relates to the field of smart home appliance technology, and in particular to a gas-fired water heater. The water heater includes a centrifugal fan for air delivery, a combustion chamber, and a gas delivery device for gas delivery. A square assembly interface is provided on one side of the combustion chamber, with two mounting plates and two mounting slots on the square assembly interface. The two mounting plates are arranged opposite each other, and the two mounting slots are arranged parallel to each other. The two mounting plates have rounded corners on the side closest to the combustion chamber. The volute of the centrifugal fan includes a first cover plate, a second cover plate, and an annular wall. The first and second cover plates are arranged parallel to each other, and the annular wall is located between the first and second cover plates. The two sides of the annular wall, the first cover plate, and the second cover plate form the air outlet of the centrifugal fan. The first and second cover plates match the two mounting slots, and the two sides of the annular wall match the two mounting plates. By adjusting the assembly method between the centrifugal fan and the water heater combustion chamber, the noise of the water heater is reduced.

Description

Technical Field

[0001] This application relates to the field of smart home appliance technology, and in particular to a gas-fired water heater. Background Technology

[0002] Gas water heaters are devices that provide hot water by mixing and burning air and gas in a combustion chamber and transferring the heat of combustion to the water. In existing water heaters, air is usually driven into the combustion chamber by a multi-bladed centrifugal fan. However, there is a trend in current technology to make the structure of water heaters more compact, which leads to an increasingly compact internal structure. The centrifugal fan is prone to noise due to assembly issues, which in turn affects the user experience. Summary of the Invention

[0003] In view of the above-mentioned problems in the prior art, the purpose of this application is to reduce the noise of the water heater by adjusting the assembly method of the centrifugal fan and the combustion chamber of the water heater.

[0004] To address the aforementioned problems, this application provides a gas-fired water heater, comprising a centrifugal fan for air delivery, a combustion chamber, and a gas delivery device for gas delivery. The output end of the gas delivery device is connected to the combustion chamber; A square assembly interface is provided on one side of the combustion chamber. The square assembly interface is provided with two mounting plates and two mounting slots. The two mounting plates are arranged opposite each other, and the two mounting slots are arranged parallel to each other. The two mounting plates have rounded corners on the side closest to the combustion chamber; The centrifugal fan casing includes a first cover plate, a second cover plate, and an annular wall. The first cover plate and the second cover plate are arranged in parallel, and the annular wall is disposed between the first cover plate and the second cover plate. The two sides of the ring wall are spaced apart, and the two sides of the ring wall, the first cover plate and the second cover plate form the air outlet of the centrifugal fan; The first cover plate and the second cover plate are matched with the two mounting slots, and the two sides of the annular wall are matched with the two mounting plates.

[0005] In this embodiment of the application, the two mounting plates are respectively provided with assembly holes, and the two sides of the ring wall are respectively provided with fixing mounting holes. The fixing mounting holes match the assembly holes so as to fix the centrifugal fan to the combustion chamber.

[0006] In this embodiment of the application, the top height of the first cover plate and the second cover plate near the combustion chamber is greater than the top height of the two sides of the annular wall near the combustion chamber.

[0007] In this embodiment, the first cover plate and the second cover plate are capable of extending into the combustion chamber.

[0008] In this embodiment of the application, the air outlet is a horn-shaped air outlet, and the included angle between the two sides of the ring wall is within a preset angle range.

[0009] In this embodiment of the application, the included angle between the two mounting plates is the same as the included angle between the two sides of the ring wall.

[0010] In this embodiment, the two mounting plates further include a straight mounting plate on the side away from the combustion chamber, and the straight mounting plate is connected to the rounded corner structure; The two sides of the ring wall are fixed to the linear mounting plate.

[0011] In this embodiment of the application, the end of the linear mounting plate near the air outlet is beveled.

[0012] In this embodiment of the application, the fillet radius corresponding to the rounded corner structure is within a preset radius range; the preset radius range is determined based on the impeller diameter.

[0013] In this embodiment of the application, the combustion chamber is provided with a flow equalization plate, which divides the combustion chamber into a pressure stabilizing chamber close to the centrifugal fan and a combustion chamber far away from the centrifugal fan.

[0014] Due to the above technical solution, the gas-fired water heater described in this application has the following beneficial effects: By setting the assembly interface of the combustion chamber as two mounting plates and two mounting slots, and setting a rounded corner structure on the side of the mounting plate near the combustion chamber, the ring wall of the centrifugal fan is assembled with the two mounting plates. The first cover plate and the second cover plate are inserted into the mounting slot, thereby completing the assembly of the centrifugal fan and the combustion chamber. The airflow from the centrifugal fan outlet will directly enter the combustion chamber along the guide of the mounting plate and the rounded corner structure, reducing the degree of airflow turbulence at the fan outlet and reducing the airflow loss at the fan outlet, thereby improving the combustion efficiency of the water heater and reducing the noise of the water heater. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 is a schematic diagram of the internal structure of a gas water heater provided in an embodiment of this application; Figure 2 is a schematic diagram of the square assembly port in the gas water heater provided in the embodiment of this application; Figure 3 is a schematic diagram of the centrifugal fan in the gas water heater provided in the embodiment of this application; Figure 4 is a schematic diagram of the assembly of the centrifugal fan in the gas water heater provided in the embodiment of this application.

[0017] Among them, 1-centrifugal fan, 11-volute, 111-first cover plate, 112-second cover plate, 113-ring wall, 12-air outlet, 13-impeller, 14-air inlet, 2-combustion chamber, 3-square assembly port, 31-mounting plate, 311-rounded corner structure, 312-straight mounting plate, 32-mounting groove, 4-flow equalization plate. Detailed Implementation

[0018] 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 of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0019] The term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this application. In the description of this application, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this application. Furthermore, 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0020] Combination Figure 1-4This application describes a gas-fired water heater provided in an embodiment, comprising a centrifugal fan 1 for air delivery, a combustion chamber 2, and a gas delivery device for gas delivery, the output end of which is connected to the combustion chamber 2. A square assembly interface is provided on one side of the combustion chamber 2, with two mounting plates 31 and two mounting slots 32. The two mounting plates 31 are arranged opposite each other, and the two mounting slots 32 are arranged parallel to each other. The two mounting plates 31 have rounded corner structures 311 on the side closest to the combustion chamber 2. The centrifugal fan 1 has a volute... The shell 11 includes a first cover plate 111, a second cover plate 112, and an annular wall 113. The first cover plate 111 and the second cover plate 112 are arranged in parallel, and the annular wall 113 is disposed between the first cover plate 111 and the second cover plate 112. The two sides of the annular wall 113 are spaced apart, and the two sides of the annular wall 113, the first cover plate 111, and the second cover plate 112 form the air outlet 12 of the centrifugal fan 1. The first cover plate 111 and the second cover plate 112 are matched with two mounting grooves 32, and the two sides of the annular wall 113 are matched with two mounting plates 31.

[0021] In this embodiment of the application, the centrifugal fan 1 further includes an impeller 13, which is disposed inside the volute 11.

[0022] In specific embodiments of this application, the square assembly interface can be a rectangular assembly interface or a square assembly interface.

[0023] In a specific embodiment of this application, the first cover plate 111 is provided with an air inlet 14 corresponding to the center of the impeller 13.

[0024] In a specific embodiment of this application, the gas from the centrifugal fan 1 enters the impeller 13 through the air inlet 14 of the first cover plate 111. Under the drive of the high-speed rotating impeller 13 blades, it gains kinetic energy. Then, due to centrifugal action, the gas in the airflow channel between the volute 11 and the impeller 13 is converted into static pressure energy. Finally, it is discharged from the air outlet 12, thereby delivering air to the combustion chamber 2.

[0025] In a specific embodiment of this application, the surface of the annular wall 113 can be composed of any combination of curves such as line segments, circular arcs or spline curves, and ellipses.

[0026] In specific embodiments of this application, the blades of the impeller 13 can be high-pressure, low-efficiency forward-curved blades, high-efficiency, energy-saving backward-curved blades, or wear-resistant and durable radial blades.

[0027] In a specific embodiment of this application, the centrifugal fan 1 further includes a drive device for driving the rotation of the impeller 1313; specifically, the drive device includes a motor, bearings, and power transmission components such as a coupling.

[0028] In a specific embodiment of this application, the centrifugal fan 1 is a bottom-drum centrifugal fan 1 in a gas-fired water heater.

[0029] In a specific embodiment of this application, the combustion chamber 2 is used to mix gas and air according to a preset ratio to form a combustible gas. Preferably, the gas can be natural gas, and the preset ratio can be 10 times that of natural gas and 8 times that of air.

[0030] In a specific embodiment of this application, the water heater is further provided with an igniter, which is used to ignite combustible gas; preferably, the igniter is an electronic igniter, which is connected to the controller.

[0031] In a specific embodiment of this application, the first cover plate 111 and the second cover plate 112 can respectively fill their respective mounting grooves 32; preferably, the first cover plate 111 and the second cover plate 112 are interference-fitted; that is, the length of the first cover plate 111 in the left-right direction is greater than or equal to the length of its corresponding mounting groove 32, and the thickness of the first cover plate 111 is greater than or equal to the width of its corresponding mounting groove 32; the left-right direction is a direction perpendicular to the direction of the air outlet 12 and the direction of the air inlet 14; the length of the second cover plate 112 in the left-right direction is greater than or equal to the length of its corresponding mounting groove 32, and the thickness of the second cover plate 112 is greater than or equal to the width of its corresponding mounting groove 32.

[0032] In a specific embodiment of this application, a fastener can be used to fix the centrifugal fan 1 to the square assembly interface; preferably, the fastener can be a screw, pin, bolt, etc.

[0033] In this embodiment, the assembly interface of the combustion chamber 2 is configured as two mounting plates 31 and two mounting slots 32, and a rounded corner structure 311 is provided on the side of the mounting plate 31 near the combustion chamber 2. The annular wall 113 of the centrifugal fan 1 is assembled with the two mounting plates 31, and the first cover plate 111 and the second cover plate 112 are inserted into the mounting slots 32, thereby completing the assembly of the centrifugal fan 1 and the combustion chamber 2. The airflow from the outlet 12 of the centrifugal fan 1 will directly enter the combustion chamber 2 along the guide of the mounting plate 31 and the rounded corner structure 311, reducing the degree of airflow turbulence at the fan outlet and reducing the airflow loss at the fan outlet, thereby improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0034] In this embodiment, the two mounting plates 31 are respectively provided with assembly holes, and the two sides of the annular wall 113 are respectively provided with fixing mounting holes. The fixing mounting holes match the assembly holes so as to fix the centrifugal fan 1 to the combustion chamber 2.

[0035] In a specific embodiment of this application, the distance between the two mounting plates 31 is less than the distance between the two sides of the annular wall 113. That is, the two mounting plates 31 are fixed in the middle between the two sides of the annular wall 113. As a result, the two mounting plates 31 can be directly used as part of the air outlet 12, thereby guiding the airflow of the centrifugal fan 1 air outlet 12, reducing the degree of airflow turbulence at the fan outlet, reducing the airflow loss at the fan outlet, thereby improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0036] In a specific embodiment of this application, two mounting plates 31 extend into the air outlet 12 of the centrifugal fan 1.

[0037] In this embodiment, by providing assembly holes on two mounting plates 31 and fixing mounting holes on both sides of the annular wall 113, the centrifugal fan 1 is assembled when the first cover plate 111 and the second cover plate 112 are inserted into the mounting groove 32, thereby improving the assembly stability of the centrifugal fan 1 and thus improving the reliability of the water heater.

[0038] In a specific embodiment of this application, the distance difference between the two sides of the annular wall 113 and the two mounting plates 31 is equal to the thickness of the two mounting plates 31, thereby ensuring that the two sides of the annular wall 113 are tightly fitted to the two mounting plates 31.

[0039] In this embodiment, the top height of the first cover plate 111 and the second cover plate 112 near the combustion chamber 2 is greater than the top height of both sides of the annular wall 113 near the combustion chamber 2.

[0040] In a specific embodiment of this application, the height difference between the top of the first cover plate 111 and the second cover plate 112 near the combustion chamber 2 and the top of the two sides of the annular wall 113 near the combustion chamber 2 is greater than or equal to the height of the rounded corner structure 311.

[0041] In this embodiment, the first cover plate 111 and the second cover plate 112 can extend into the combustion chamber 2.

[0042] In a specific embodiment of this application, the extension length of the first cover plate 111 and the second cover plate 112 into the combustion chamber 2 is less than or equal to a preset length, wherein the preset length can be 1 mm or 2 mm.

[0043] In this embodiment, by configuring the first cover plate 111 and the second cover plate 112 to be able to penetrate into the combustion chamber 2 through the mounting groove 32, and by making the top height of the first cover plate 111 and the second cover plate 112 near the combustion chamber 2 greater than the top height of the two sides of the annular wall 113 near the combustion chamber 2, the air outlet 12 of the centrifugal fan 1 is formed by utilizing the square assembly interface of the combustion chamber 2, thereby reducing the airflow loss at the fan outlet, thus improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0044] In this embodiment of the application, the air outlet 12 is a trumpet-shaped air outlet, and the included angle between the two sides of the annular wall 113 is within a preset angle range.

[0045] In a specific embodiment of this application, the two sides of the annular wall 113 are straight plates.

[0046] In a specific embodiment of this application, the air outlet 12 is a trumpet-shaped air outlet, indicating that the air outlet width on the side closer to the combustion chamber 2 is greater than the air outlet width on the side farther from the combustion chamber 2.

[0047] In this embodiment of the application, by setting the air outlet 12 as a trumpet-shaped air outlet and setting the included angle between the two sides of the annular wall 113 within a preset angle range, the gas flow velocity at the air outlet 12 can be reduced, thereby improving the conveying efficiency of the centrifugal fan 1.

[0048] In a specific embodiment of this application, the preset angle range can be 5-20°, preferably 8-16°, in order to improve the optimal efficiency of the centrifugal fan 1.

[0049] In this embodiment, the included angle between the two mounting plates 31 is the same as the included angle between the two sides of the annular wall 113.

[0050] In this embodiment, by making the included angle between the two mounting plates 31 the same as the included angle between the two sides of the ring wall 113, the tightness of the assembly between the mounting plates 31 and the ring wall 113 is ensured, thus avoiding airflow loss at the outlet 12 of the centrifugal fan 1 due to loose assembly and reducing the noise of the centrifugal fan 1.

[0051] In this embodiment, the two mounting plates 31 also include a straight mounting plate 312 on the side away from the combustion chamber 2, the straight mounting plate 312 being connected to the rounded corner structure 311; the two sides of the ring wall 113 are fixed to the straight mounting plate 312.

[0052] In a specific embodiment of this application, the assembly hole is provided on the linear mounting plate 312.

[0053] In a specific embodiment of this application, the length of the linear mounting plate 312 is greater than or equal to 6 mm.

[0054] In this embodiment, the centrifugal fan 1 is installed and fixed by the straight mounting plate 312, thereby determining the smooth curved surface of the rounded corner structure 311, which improves the airflow guiding effect of the air outlet 12 of the centrifugal fan 1 and reduces the noise of the centrifugal fan 1.

[0055] In this embodiment, the end of the linear mounting plate 312 near the air outlet 12 is beveled.

[0056] In a specific embodiment of this application, the end of the straight mounting plate 312 near the air outlet 12 is a beveled surface, and the straight mounting plate 312 is located between the two sides of the annular wall 113; that is, the surface of the mounting plate 31 that the airflow at the air inlet 14 first contacts is a beveled surface.

[0057] In a specific embodiment of this application, the beveled surface is inclined along the air outlet direction to guide the airflow at the air outlet 12.

[0058] In this embodiment of the application, by setting the end of the straight mounting plate 312 near the air outlet 12 as a bevel, the airflow at the air outlet 12 can be guided, thereby reducing the airflow loss at the air outlet 12 and thus reducing the airflow noise of the fan.

[0059] In this embodiment, the fillet radius corresponding to the rounded corner structure 311 is within a preset radius range; the preset radius range is determined based on the impeller 13 diameter.

[0060] In a specific embodiment of this application, the two ends of the preset radius range are a first preset radius and a second preset radius, wherein the first preset radius is determined based on the product of the impeller 13 diameter and a first preset coefficient, and the second preset radius is determined based on the product of the impeller 13 diameter and a second preset coefficient; the first preset coefficient is less than the second preset coefficient.

[0061] In a specific embodiment of this application, the first preset coefficient can be 5% or 6%.

[0062] In a specific embodiment of this application, the second preset coefficient can be 9% or 10%.

[0063] In a specific embodiment of this application, the diameter of the impeller 13 represents the size of the impeller 13. That is, the larger the size of the impeller 13, the larger the radius of the rounded corners, thereby ensuring the flow guiding effect.

[0064] In this embodiment, by setting the radius of the rounded corner portion within a preset radius range, the flow guiding effect of the rounded corner portion at the air outlet 12 is ensured, thereby reducing the airflow loss of the centrifugal fan 1 entering the combustion chamber 2, thus improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0065] In this embodiment of the application, a flow equalization plate 4 is provided in the combustion chamber 2, which divides the combustion chamber 2 into a pressure stabilizing chamber close to the centrifugal fan 1 and a combustion chamber far away from the centrifugal fan 1.

[0066] In a specific embodiment of this application, the flow equalization plate 4 is used to evenly distribute the airflow from the outlet 12 of the centrifugal fan 1, so that the air is evenly distributed in the combustion chamber 2.

[0067] In a specific embodiment of this application, the cavity between the flow equalization plate 4 and the outlet of the centrifugal fan 1 can be called the pressure stabilizing cavity. That is, the flow equalization plate 4 divides the combustion chamber 2 into the pressure stabilizing cavity and the combustion chamber.

[0068] In a specific embodiment of this application, the flow equalization plate 4 is provided with a plurality of evenly arranged guide holes, through which the airflow flows from the pressure stabilizing chamber into the combustion chamber.

[0069] In this embodiment of the application, by setting a flow equalization plate 4 in the combustion chamber 2, the uniformity of airflow entering the combustion chamber can be improved, thereby improving the uniformity of air-gas mixing, and thus improving the combustion efficiency and heating efficiency of the water heater.

[0070] In this embodiment, the distance between the air outlet 12 of the centrifugal fan 1 and the flow equalization plate 4 is within a preset distance range; the preset distance range is determined based on the maximum distance between the two mounting plates 31.

[0071] In a specific embodiment of this application, the distance between the air outlet 12 of the centrifugal fan 1 and the flow equalization plate 4 is within a preset distance range, indicating that the height of the pressure stabilizing cavity is within a preset height range, thereby avoiding the pressure stabilizing cavity being too large or too small, thereby reducing the airflow loss of the centrifugal fan 1 entering the combustion chamber 2, thereby improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0072] In a specific embodiment of this application, the two ends of the preset distance range are a first preset distance and a second preset distance, respectively. The first preset distance is determined based on the product of the maximum distance between the two mounting plates 31 and a third preset coefficient, and the second preset distance is determined based on the product of the maximum distance between the two mounting plates 31 and a fourth preset coefficient.

[0073] In a specific embodiment of this application, the third preset coefficient can be 0.5 or 0.6.

[0074] In a specific embodiment of this application, the fourth preset coefficient can be 0.25 or 0.3.

[0075] In a specific embodiment of this application, the larger the volume of the pressure stabilizing chamber, the greater the flow area of ​​the airflow as it moves from the outlet 12 to the flow equalization plate 4 into the combustion chamber, resulting in greater airflow loss and making it prone to abnormal noise. Conversely, the smaller the volume of the pressure stabilizing chamber, the smaller the flow area of ​​the airflow as it moves from the outlet 12 to the flow equalization plate 4 into the combustion chamber, the greater the airflow velocity, thus increasing airflow loss. Therefore, the height of the pressure stabilizing chamber is limited to a preset height range, and the preset height range matches the maximum distance between the two mounting plates 31. Specifically, the maximum distance between the two mounting plates 31 can characterize the unit airflow rate.

[0076] In specific embodiments of this application, the third preset coefficient and the fourth preset coefficient can also be determined based on the shape of the square assembly interface. Different shapes of square assembly interfaces correspond to different preset coefficients. Specifically, the preset coefficient of a rectangular outlet is less than the preset coefficient of a square outlet. For example, the third preset coefficient of a rectangular outlet is less than the third preset coefficient of a square outlet; the fourth preset coefficient of a rectangular outlet is less than the fourth preset coefficient of a square outlet.

[0077] The water heater in this embodiment can also be controlled by a voice module, which is equipped with a controller, a voice receiving module, and a voice parsing module. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the gas water heater to perform corresponding operations, thereby realizing intelligent control of the smart integrated appliance and improving the user experience.

[0078] The gas-fired water heater in this embodiment has the following beneficial effects: By setting the assembly interface of the combustion chamber 2 as two mounting plates 31 and two mounting slots 32, and setting a rounded corner structure 311 on the side of the mounting plate 31 near the combustion chamber 2, the annular wall 113 of the centrifugal fan 1 is assembled with the two mounting plates 31, and the first cover plate 111 and the second cover plate 112 are inserted into the mounting slots 32, thereby completing the assembly of the centrifugal fan 1 and the combustion chamber 2. The airflow from the outlet 12 of the centrifugal fan 1 will directly enter the combustion chamber 2 along the guide of the mounting plate 31 and the rounded corner structure 311, reducing the degree of airflow turbulence at the fan outlet and reducing the airflow loss at the fan outlet, thereby improving the combustion efficiency of the water heater and reducing the noise of the water heater.

[0079] The foregoing description has fully disclosed the specific embodiments of this application. It should be noted that any modifications made by those skilled in the art to the specific embodiments of this application do not depart from the scope of the claims. Accordingly, the scope of the claims of this application is not limited to the foregoing specific embodiments.

Claims

1. A gas-fired water heater, characterized in that, It includes a centrifugal fan (1) for air transport, a combustion chamber (2), and a gas transport device for gas transport. The output end of the gas delivery device is connected to the combustion chamber (2); The combustion chamber (2) has a square assembly interface on one side, and the square assembly interface has two mounting plates (31) and two mounting slots (32). The two mounting plates (31) are arranged opposite to each other, and the two mounting slots (32) are arranged in parallel. The two mounting plates (31) are provided with rounded corner structures (311) on the side near the combustion chamber (2); The centrifugal fan (1) has a volute (11) including a first cover plate (111), a second cover plate (112) and an annular wall (113). The first cover plate (111) and the second cover plate (112) are arranged in parallel, and the annular wall (113) is disposed between the first cover plate (111) and the second cover plate (112). The two sides of the ring wall (113) are spaced apart, and the two sides of the ring wall (113), the first cover plate (111) and the second cover plate (112) form the air outlet (12) of the centrifugal fan (1); The first cover plate (111) and the second cover plate (112) are matched with the two mounting grooves (32), and the two sides of the annular wall (113) are matched with the two mounting plates (31).

2. The gas-fired water heater according to claim 1, characterized in that, The two mounting plates (31) are respectively provided with assembly holes, and the two sides of the ring wall (113) are respectively provided with fixing mounting holes. The fixing mounting holes match the assembly holes so that the centrifugal fan (1) is fixed to the combustion chamber (2).

3. The gas-fired water heater according to claim 1, characterized in that, The height of the top of the first cover plate (111) and the second cover plate (112) near the combustion chamber (2) is greater than the height of the top of the two sides of the annular wall (113) near the combustion chamber (2).

4. The gas-fired water heater according to claim 3, characterized in that, The first cover plate (111) and the second cover plate (112) can extend into the combustion chamber (2).

5. The gas-fired water heater according to claim 1, characterized in that, The air outlet (12) is a trumpet-shaped air outlet, and the included angle between the two sides of the ring wall (113) is within a preset angle range.

6. The gas-fired water heater according to claim 5, characterized in that, The included angle between the two mounting plates (31) is the same as the included angle between the two sides of the ring wall (113).

7. The gas-fired water heater according to claim 1, characterized in that, The two mounting plates (31) also include a straight mounting plate (312) on the side away from the combustion chamber (2), and the straight mounting plate (312) is connected to the rounded corner structure (311); The two sides of the ring wall (113) are fixed to the straight mounting plate (312).

8. The gas-fired water heater according to claim 1, characterized in that, The end of the straight mounting plate (312) near the air outlet (12) is beveled.

9. The gas-fired water heater according to claim 1, characterized in that, The radius of the fillet corresponding to the rounded corner structure (311) is within a preset radius range; the preset radius range is determined based on the diameter of the impeller (13).

10. The gas-fired water heater according to claim 1, characterized in that, The combustion chamber (2) is provided with a flow equalization plate (4), which divides the combustion chamber (2) into a pressure stabilizing chamber close to the centrifugal fan (1) and a combustion chamber far away from the centrifugal fan (1).

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