A gas water heating apparatus

Abstract

The utility model belongs to the combustion technical field, specifically disclose a kind of gas hot water equipment. Gas hot water equipment, including the inner joint of installation at the smoke outlet and the outer joint of installation at the air inlet of shell top, inner joint includes the inner conical pipe portion of lower big upper small and the inner round pipe portion of coaxial connection on inner conical pipe portion upper end, inner conical pipe portion is arranged in air inlet, outer joint includes the outer conical pipe portion of lower big upper small and the outer round pipe portion of coaxial connection on outer conical pipe portion upper end;Outer conical pipe portion is coaxial and intervally covered in the outside of inner conical pipe portion, and it is formed with lower air duct between outer conical pipe portion and inner conical pipe portion, outer round pipe portion is coaxial and intervally covered in the outside of inner round pipe portion, upper air duct is formed between outer round pipe portion and inner round pipe portion, the air duct width d1 of upper air duct is less than or equal to the minimum air duct width d2 of lower air duct. The utility model can improve the air inlet smoothness, reduce air inlet noise.

Description

Technical Field

[0001] This utility model relates to the field of combustion technology, and in particular to a gas-fired hot water device. Background Technology

[0002] Gas water heating equipment, such as gas water heaters and gas wall-hung boilers, heats water flowing through a heat exchanger by using high-temperature flue gas generated from the combustion of gas to meet the hot water supply requirements.

[0003] To improve thermal efficiency, existing technology provides a balanced gas-fired water heater. It features an inner connector at the fan exhaust port, with an inner flue pipe connected to its top. An air inlet is located at the top of the casing, with an outer connector at its top. An outer duct is connected to the top of the outer connector. The outer connector is spaced outside the inner connector, and the outer duct is spaced outside the inner flue pipe, creating an air intake channel between the inner and outer flue pipes, and between the inner and outer connectors. During fan operation, the heat-exchanged flue gas is discharged through the inner flue pipe, while external air, under negative pressure inside the casing, enters the casing through the air intake channel to supplement combustion gas. Simultaneously, the air flowing within the air intake channel exchanges heat with the flue gas in the inner flue pipe, thus preheating the air.

[0004] Existing balanced flue gas water heaters use coaxially fitted circular pipe structures for the inner and outer connectors, forming a straight-through flow channel. This straight-through flow channel has a design flaw: when the inlet and / or outlet of the inner connector encounters a vertical resistance structure, the straight-through flow channel easily induces an increase in vortex intensity and a sharp rise in airflow resistance, leading to obstructed smoke exhaust, insufficient air intake, and affecting combustion stability and water heater operating efficiency. Furthermore, the poor air intake also results in excessive intake noise, impacting the user experience of the gas water heater. Therefore, there is an urgent need for a gas water heater to solve the aforementioned technical problems. Utility Model Content

[0005] The technical problem solved by this utility model is to provide a gas-fired water heater that can effectively solve the problems of poor air intake and excessive air intake noise in existing gas-fired water heaters.

[0006] The above-mentioned technical problems are solved by the following technical solutions:

[0007] A gas-fired water heater includes an inner connector installed at the flue gas outlet and an outer connector installed at the air inlet on the top of the casing. The inner connector includes an inner conical tube section that is larger at the bottom and smaller at the top, and an inner circular tube section coaxially connected to the upper end of the inner conical tube section. The inner conical tube section passes through the air inlet. The outer connector includes an outer conical tube section that is larger at the bottom and smaller at the top, and an outer circular tube section coaxially connected to the upper end of the outer conical tube section.

[0008] The outer conical tube is coaxially and spaced out on the outside of the inner conical tube, and a lower air duct is formed between the outer conical tube and the inner conical tube. The outer circular tube is coaxially and spaced out on the outside of the inner circular tube, and an upper air duct is formed between the outer circular tube and the inner circular tube. The width d1 of the upper air duct is less than or equal to the minimum width d2 of the lower air duct.

[0009] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages: Because the internal connector includes an inner conical tube that is wider at the bottom and narrower at the top, it can better guide the flue gas flowing out of the exhaust port upwards, achieving a flue gas gathering effect and improving the smoothness of flue gas emission. By setting an outer conical tube that fits with the inner conical tube and an outer circular tube that fits with the inner circular tube, the lower air duct is inclined from top to bottom away from the center of the casing, thereby guiding the air and reducing the probability of air colliding with the combustion heat exchange module and generating eddies. Furthermore, because the width of the lower air duct is greater than the width of the upper air duct, it can reduce the resistance of air turning from the upper air duct to the lower air duct, further improving the smoothness of air intake, thereby reducing intake noise and improving the user experience of the gas-fired water heater.

[0010] In one embodiment, 1≤d2 / d1≤2.

[0011] In one embodiment, the width of the downdraft is the same from top to bottom, or the width of the downdraft gradually increases from top to bottom.

[0012] In one embodiment, the upper end of the inner tapered tube is lower than the upper end of the outer tapered tube.

[0013] In one embodiment, the cone angle of the inner conical tube is A1, and the cone angle of the outer conical tube is A2, where 0 ≤ A1 - A2 ≤ 5°;

[0014] And / or, the cone angle of the inner tapered tube is A1, 5°≤A1≤45°;

[0015] And / or, the axial height of the inner tapered tube is h1, 10mm≤h1≤45mm.

[0016] In one embodiment, the lower end of the inner tapered tube is lower than the upper inner wall of the housing.

[0017] In one embodiment, the height difference between the upper end of the inner tapered tube and the upper inner wall of the housing is d3, where 0.5mm≤d3≤3mm.

[0018] In one embodiment, the lower end of the outer tapered tube extends radially outward to form a mounting plate portion, which is fastened to the housing.

[0019] In one embodiment, a seal is provided between the mounting plate and the top of the housing, and the seal is arranged around the air inlet.

[0020] In one embodiment, the outer periphery of the mounting plate portion extends downward to a peripheral outer edge portion, the peripheral outer edge portion being disposed around the outside of the seal;

[0021] And / or, the periphery of the air inlet is folded upward to form an inner baffle, and the sealing element is fitted onto the outside of the inner baffle. Attached Figure Description

[0022] Figure 1 A partial structural cross-sectional view of a gas-fired water heater provided in an embodiment of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of a section at point I;

[0024] Figure 3 A schematic diagram of the exhaust and air intake flow of a gas-fired water heater provided for an embodiment of this utility model;

[0025] Figure 4 A schematic diagram of the internal connector provided in an embodiment of this utility model;

[0026] Figure 5 A cross-sectional view of the external connector and seal provided in an embodiment of this utility model.

[0027] Label Explanation:

[0028] 1. Internal connector; 11. Inner tapered tube section; 12. Inner round tube section; 13. Upper mounting ring section; 14. Lower mounting ring section;

[0029] 2. External connector; 21. External tapered tube section; 22. External round tube section; 23. Connecting ring section; 24. Mounting plate section; 25. External retaining edge section;

[0030] 3. Housing; 31. Top plate; 311. Air inlet; 32. Inner baffle; 33. Protruding ring;

[0031] 4. Combustion heat exchange module; 41. Exhaust port; 5. Upper air duct; 6. Lower air duct; 7. Sealing components. Detailed Implementation

[0032] 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.

[0033] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "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.

[0034] 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. Therefore, a feature defined as "first" or "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.

[0035] 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.

[0036] This embodiment provides a balanced gas water heater to improve the smoothness of flue gas and air intake, reduce the operating noise of the gas water heater, and enhance the user experience.

[0037] like Figures 1 to 3As shown, specifically, the gas-fired water heater includes a casing 3, a combustion heat exchange module 4, and a flue assembly (not shown). The combustion heat exchange module 4 is located inside the casing 3 and includes a fan and, from bottom to top, a burner assembly, a combustion chamber, a heat exchanger, and a smoke hood. The upper end of the combustion heat exchange module 4 has a smoke exhaust port 41. The high-temperature flue gas generated by the ignition and combustion of the burner assembly is drawn by the fan and flows sequentially through the combustion chamber, the heat exchanger, and the smoke hood before flowing to the smoke exhaust port 41. An air inlet 311 is opened at the top of the casing 3. The flue assembly includes an inner flue and an outer air duct spaced outside the inner flue. The inner flue forms a smoke exhaust channel for flue gas discharge, and the inner flue and the outer air duct form an air intake channel for air intake.

[0038] To facilitate the installation of the internal flue and external air duct, the gas water heater also includes an internal connector 1 and an external connector 2. The lower end of the internal connector 1 is sealed and installed at the flue outlet 41, and the upper end of the internal connector 1 extends outside the casing 3 and is connected to the flue inlet of the internal flue. The lower end of the external connector 2 is installed at the air inlet 311 at the top of the casing 3, and the upper end of the external connector 2 is connected to the air outlet of the external air duct.

[0039] In this embodiment, the inner connector 1 includes an inner conical tube section 11 that is larger at the bottom and smaller at the top, and an inner circular tube section 1 coaxially connected to the upper end of the inner conical tube section 11. The inner conical tube section 11 passes through the air inlet 311. The outer connector 2 includes an outer conical tube section 21 that is larger at the bottom and smaller at the top, and an outer circular tube section 22 coaxially connected to the upper end of the outer conical tube section 21. The outer conical tube section 21 is coaxially and spaced out on the outside of the inner conical tube section 11, and a lower air duct 6 is formed between the outer conical tube section 21 and the inner conical tube section 11. The outer circular tube section 22 is coaxially and spaced out on the outside of the inner circular tube section 12, and an upper air duct 5 is formed between the outer circular tube section 22 and the inner circular tube section 12. The air duct width d1 of the upper air duct 5 is less than or equal to the minimum air duct width d2 of the lower air duct 6.

[0040] The gas-fired water heater provided in this embodiment has an inner connector 1 consisting of an inner conical tube section 11 (larger at the bottom and smaller at the top) and an inner circular tube section 12. This allows the lower port diameter of the inner connector 1 to be compatible with the flue gas outlet 41 while reducing the upper port diameter, thereby reducing the required diameter of the inner flue pipe, lowering costs, and improving installation convenience. Simultaneously, because the diameter of the inner conical tube section 11 gradually decreases from bottom to top, it better guides the flue gas flowing out of the flue gas outlet 41 upwards, achieving a flue gas gathering effect and improving the smoothness of flue gas emission. By setting the inner conical tube section... The outer conical tube 21 and the outer circular tube 22 that are fitted together with the inner circular tube 12 make the lower air duct 6 inclined from top to bottom away from the center of the casing 3. This guides the incoming air to move away from the combustion heat exchange module 4, reducing the probability of air colliding with the combustion heat exchange module 4 and generating eddies. Furthermore, since the width of the lower air duct 6 is greater than the width of the upper air duct 5, it reduces the resistance of air turning from the upper air duct 5 to the lower air duct 6, further improving the smoothness of air intake, thereby reducing air intake noise and improving the user experience of the gas water heater.

[0041] In one embodiment, the fan outlet forms the exhaust port 41 of the entire combustion heat exchange module; that is, the fan is installed on the smoke hood, and the inner connector 1 is installed at the fan outlet. In other embodiments, the fan may also be located below the burner assembly, and the exhaust port 41 is provided at the top of the smoke hood.

[0042] In one embodiment, 1≤d2 / d1≤2, so as to ensure smooth air intake while ensuring the overall structural design of the inner connector 1 and the outer connector 2 is reasonable, and to avoid the problem of the outer diameter of the outer conical tube 21 being too large, which would affect the processing or aesthetics.

[0043] To better ensure the smooth flow of air from the upper air duct 5 to the lower air duct 6, in one embodiment, the width of the lower air duct 6 is set to be the same from top to bottom, or the width of the lower air duct 6 gradually increases from top to bottom.

[0044] In one embodiment, the upper end of the inner tapered tube portion 11 is lower than the upper end of the outer tapered tube portion 21. This allows for an increase in the distance between the inner and outer tapered tube portions 11 and 21 while maintaining approximately the same taper angle, making it easier to achieve a setting where d2 > d1 and simplifying the structure. In other embodiments, the setting where d2 > d1 can also be achieved by adjusting the taper angles of the inner and outer tapered tube portions 11 and 21.

[0045] It is worth noting that when the cone angles of the inner conical tube section 11 and the outer conical tube section 21 are determined, the larger the distance between the upper end of the inner conical tube section 11 and the upper end of the outer conical tube section 21, the larger d2 will be. However, due to the overall size of the housing 3, the distance between the exhaust port 41 and the top of the housing 3 in the height direction is usually fixed. The downward movement of the upper end of the inner conical tube section 11 will lead to a decrease in the axial height of the inner conical tube section 11, which in turn will weaken the guiding effect of the flue gas emission. If the height of the upper end of the outer conical tube section 21 is increased, the diameter of the air inlet 311 and the lower end diameter of the outer conical tube section 21 will increase under the same cone angle, resulting in increased size and cost. In one embodiment, the height difference between the upper end of the outer conical tube portion 21 and the upper end of the inner conical tube portion 11 is 1mm to 5mm. The selectable values ​​can be, but are not limited to, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm and 5mm.

[0046] In one embodiment, the cone angle of the inner conical tube 11 is A1, and the cone angle of the outer conical tube 21 is A2, where 0 ≤ A1 - A2 ≤ 5°. This arrangement ensures that the cone angle of the inner conical tube 11 is greater than or equal to the cone angle of the outer conical tube 21, thus preventing the width of the downdraft 6 from gradually decreasing from top to bottom and causing an increase in air intake resistance. Simultaneously, it avoids the problem of needing to significantly increase the distance between the upper ends of the inner and outer conical tubes 11 to ensure the required width d2 due to a large difference between the cone angles of the outer and inner conical tubes 11. This arrangement is more conducive to ensuring the overall structural rationality of the inner and outer conical tubes 11. Furthermore, this arrangement also ensures that the width of the downdraft 6 is approximately consistent throughout, thereby improving the uniformity of airflow and reducing airflow noise.

[0047] When the diameter of the exhaust port 41 and the upper port diameter of the inner connector 1 remain unchanged, if the cone angle of the inner conical tube 11 is large, the axial length of the inner conical tube 11 is relatively small. The path of the flue gas from the exhaust port 41 to the inner circular tube 12 is reduced, and the probability of the flue gas colliding and eddying in the variable-diameter inner conical tube 11 increases, resulting in weakened flue gas emission stability and smoothness, and increased exhaust noise. Therefore, in order to better ensure the smoothness of flue gas emission and reduce the noise of flue gas emission, in one embodiment, 5°≤A1≤45°, preferably, 20°≤A1≤35°.

[0048] In one embodiment, the lower end of the inner conical tube 11 is positioned lower than the upper end of the housing 3, i.e., there is a height difference d3 between the lower end of the inner conical tube 11 and the upper end of the housing. This arrangement allows the outlet end of the lower air duct 6 to be lowered relative to the housing 3, thereby better guiding the air flowing out of the lower air duct 6 into the interior of the housing 3. This prevents the air flowing out of the lower air duct 6 from colliding with the connection between the housing 3 and the outer connector 2, which could cause localized eddies.

[0049] In one embodiment, 0.5mm ≤ d3 ≤ 3mm is used to avoid the problem of excessively large d3 leading to increased height requirements for the housing 3, and also to avoid the problem of excessively small d3 reducing the airflow effect. d3 can be, but is not limited to, 0.5mm, 0.7mm, 0.9mm, 1.2mm, 1.5mm, 1.8mm, 2.1mm, 2.4mm, 2.7mm, or 3mm, etc.

[0050] To further improve the smoothness of smoke exhaust and air intake, in one embodiment, the height of the inner tapered tube section 11 is h1, which is 10mm ≤ h1 ≤ 45mm. This setting allows the cone angle of the inner tapered tube section 11 to remain within a reasonable range while keeping the diameter difference between the lower and upper ports of the inner connector 1 constant. This ensures smooth smoke exhaust and air intake while improving structural rationality and avoiding the problem of increased processing costs due to an excessively high inner tapered tube section 11. h1 can be, but is not limited to, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, or 45mm, etc.

[0051] like Figure 1 and Figure 4 As shown, to improve the ease of installation of the inner connector 1 at the air inlet 311, in one embodiment, the lower end of the inner tapered tube portion 11 is coaxially connected to a lower mounting ring portion 14. The lower mounting ring portion 14 is sleeved on the outside of the enclosure wall forming the smoke exhaust port 41 to achieve installation limitation and positioning of the inner connector 1 at the smoke exhaust port 41. It is worth noting that the lower mounting ring portion 14 can be welded to the enclosure wall, or it can be detached from the enclosure wall with a sealing ring between them to seal the installation gap. The axial height of the lower mounting ring portion 14 is h2, preferably 3mm≤h2≤10mm. h2 can be, but is not limited to, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0052] In one embodiment, the upper end of the inner circular tube portion 12 extends beyond the upper end of the outer circular tube portion 22 to facilitate the assembly of the inner smoke pipe and the inner connector 1, thereby improving assembly convenience and efficiency. The height of the inner circular tube portion 12 extending beyond the outer circular tube portion 22 is d4, where 5mm ≤ d4 ≤ 10mm.

[0053] In one embodiment, the inner tapered tube portion 11 and the inner circular tube portion 12 are welded together to facilitate the processing and forming of the inner connector 1 and reduce the mold opening cost of the inner connector 1. Specifically, the upper end of the inner tapered tube portion 11 is connected to an upper mounting ring portion 13, which is attached to and welded to the inner wall of the inner circular tube portion 12. The upper mounting ring portion 13 enables the assembly and positioning of the two.

[0054] like Figure 2 and Figure 5As shown, the outer circular tube portion 22 and the outer tapered tube portion 21 are welded together to reduce the processing difficulty of the outer connector 2. Specifically, the upper end of the outer tapered tube portion 21 is coaxially connected to the connecting ring portion 23, which is fitted and welded to the inner wall of the outer circular tube portion 22. In other embodiments, the outer connector 2 can also be integrally formed.

[0055] To improve the ease of assembly between the external connector 2 and the housing 3, in one embodiment, a mounting plate 24 extends radially outward from the lower end of the outer tapered tube portion 21, and the mounting plate 24 is fastened to the housing 3. The mounting plate 24 facilitates the fastening of the external connector 2 to the housing 3.

[0056] A sealing element 7 is provided between the mounting plate 24 and the top of the housing 3. The sealing element 7 is arranged around the air inlet 311, thereby simultaneously sealing the connection between the external connector 2 and the housing 3 to prevent air leakage.

[0057] Specifically, the mounting plate 24 is provided with a plurality of first mounting holes at intervals along the circumference, the sealing element 7 is provided with a through hole, and the top plate 31 of the housing 3 is provided with a plurality of second mounting holes. The second mounting holes and the through holes are provided one-to-one with the first mounting holes, and the mounting plate 24 and the top plate 31 are connected by fasteners that are sequentially provided in the first mounting holes, the through holes and the second mounting holes, so as to press the sealing element 7 between the mounting plate 24 and the top plate 31.

[0058] In one embodiment, an outer retaining edge 25 extends downward from the outer edge of the mounting plate portion 24. The outer retaining edge 25 surrounds the seal 7 to prevent the seal 7 from falling out and to avoid the seal 7 being exposed, which would detract from the structural aesthetics. The outer retaining edge 25 preferably abuts against the top plate 31. An inner retaining edge 32 is folded up on the periphery of the air inlet 311. The seal 7 is fitted onto the outer side of the inner retaining edge 32 to prevent the seal 7 from loosening inward and to ensure the stability of the seal 7. The upper end of the inner retaining edge 32 preferably abuts against the mounting plate portion 24.

[0059] The upper end of the housing 3 is provided with a protruding ring 33, which surrounds the lower end of the outer connector 2. This allows the protruding ring 33 to provide positioning and limiting for the installation of the outer connector 2, improving the convenience and reliability of assembling the outer connector 2 with the housing 3, and also helping to ensure the coaxiality of the inner connector 1 and the outer connector 2 after assembly.

[0060] The remaining structure of the gas-fired water heater can be designed with reference to existing technologies, which is not the focus of this utility model and will not be described in detail here.

[0061] 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.

[0062] 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 gas-fired hot water device, comprising an inner connector (1) installed at the flue gas outlet (41) and an outer connector (2) installed at the air inlet (311) on the top of the casing (3), characterized in that, The inner connector (1) includes an inner conical tube section (11) that is larger at the bottom and smaller at the top, and an inner circular tube section (12) coaxially connected to the upper end of the inner conical tube section (11). The inner conical tube section (11) passes through the air inlet (311). The outer connector (2) includes an outer conical tube section (21) that is larger at the bottom and smaller at the top, and an outer circular tube section (22) coaxially connected to the upper end of the outer conical tube section (21). The outer conical tube section (21) is coaxially and spaced out on the outside of the inner conical tube section (11), and a downdraft duct (6) is formed between the outer conical tube section (21) and the inner conical tube section (11). The outer circular tube section (22) is coaxially and spaced out on the outside of the inner circular tube section (12), and an updraft duct (5) is formed between the outer circular tube section (22) and the inner circular tube section (12). The duct width d1 of the updraft duct (5) is less than or equal to the minimum duct width d2 of the downdraft duct (6).

2. The gas-fired hot water equipment according to claim 1, characterized in that, 1≤d2 / d1≤2.

3. The gas-fired hot water equipment according to claim 1, characterized in that, The width of the downdraft duct (6) is the same from top to bottom, or the width of the downdraft duct (6) gradually increases from top to bottom.

4. The gas-fired hot water equipment according to claim 1, characterized in that, The upper end of the inner conical tube (11) is lower than the upper end of the outer conical tube (21).

5. The gas-fired hot water equipment according to claim 1, characterized in that, The cone angle of the inner conical tube (11) is A1, and the cone angle of the outer conical tube (21) is A2, where 0 ≤ A1 - A2 ≤ 5°; And / or, the cone angle of the inner tapered tube (11) is A1, 5°≤A1≤45°; And / or, the axial height of the inner tapered tube (11) is h1, 10mm≤h1≤45mm.

6. The gas-fired hot water equipment according to claim 1, characterized in that, The lower end of the inner conical tube (11) is lower than the upper inner wall of the housing (3).

7. The gas-fired hot water equipment according to claim 6, characterized in that, The height difference between the upper end of the inner conical tube (11) and the upper inner wall of the housing (3) is d3, where 0.5mm≤d3≤3mm.

8. The gas-fired hot water equipment according to any one of claims 1-7, characterized in that, The lower end of the outer conical tube (21) extends radially outward to form a mounting plate (24), which is fastened to the housing (3).

9. The gas-fired hot water equipment according to claim 8, characterized in that, A sealing element (7) is provided between the mounting plate (24) and the top of the housing (3), and the sealing element (7) is arranged around the air inlet (311).

10. The gas-fired hot water equipment according to claim 9, characterized in that, The outer periphery of the mounting plate (24) extends downward to form an outer retaining edge (25), which surrounds the outer side of the seal (7). And / or, the periphery of the air inlet (311) is folded upward to form an inner baffle (32), and the sealing element (7) is fitted on the outside of the inner baffle (32).

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