Water heater

Abstract

The application discloses a water heater and relates to the technical field of water heaters. The water heater comprises a frame body, a burner and a fan. The frame body is provided with a mounting port. The burner is arranged in the frame body and is provided with an air inlet port which is communicated with the mounting port. The fan is arranged in the frame body and comprises a volute. The volute is provided with an air cavity and an air outlet port which is communicated with the air cavity. The air outlet port is butted and communicated with the mounting port. An air guide surface is arranged on the side edge of the volute close to the air outlet port. The air guide surface is arranged obliquely relative to the plane where the mounting port is located and is used for guiding the airflow of the air outlet port to the side close to the air inlet port. The technical scheme provided by the application can improve the primary air supply of the burner, promote the sufficient mixing of the gas and air, realize more complete combustion, and effectively reduce the flue gas emission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water heaters, in particular to a water heater. BACKGROUND

[0002] The prior art water heater places the fan on the left side and adopts a positive blowing mode to supply air to the burner, which results in insufficient primary air, insufficient gas mixing, incomplete combustion and high flue gas emission. SUMMARY

[0003] The main purpose of the present application is to provide a water heater, which aims to improve the primary air supply of the burner, promote the sufficient mixing of gas and air, achieve more complete combustion, and effectively reduce flue gas emission.

[0004] To achieve the above purpose, the water heater provided by the present application comprises:

[0005] A frame body having a mounting port;

[0006] A burner arranged in the frame body, the burner having an air inlet port communicating with the mounting port;

[0007] A fan arranged in the frame body, the fan comprising a volute, the volute being provided with an air cavity and an air outlet port communicating with the air cavity, the air outlet port being in abutment and communication with the mounting port, and the volute being provided with a wind guide surface on the side edge close to the air outlet port, the wind guide surface being arranged obliquely relative to the plane where the mounting port is located, for guiding the airflow of the air outlet port to the side close to the air inlet port.

[0008] In an embodiment, the wind guide surface is arranged at an angle with the plane where the mounting port is located, and the angle is not less than 65 degrees and not more than 75 degrees.

[0009] In an embodiment, the frame body comprises opposite back plates and face plates, and a bottom plate connecting the back plates and the face plates, the air inlet port is arranged towards the face plates, and the mounting port is arranged on the bottom plate.

[0010] In an embodiment, the back plates and the face plates are arranged opposite to each other along a first direction, the volute is further provided with an air inlet port communicating with the air cavity, the axis of the air inlet port is arranged extending along a second direction, the side of the volute away from the back plates is not higher than the plane where the face plates are located, and the first direction intersects the second direction.

[0011] In an embodiment, the side of the volute away from the back plates is arranged level with the plane where the face plates are located.

[0012] In an embodiment, the volute has a volute tongue and a first shell side wall opposite to the volute tongue, and the inner wall of the first shell side wall has the wind guide surface.

[0013] In an embodiment, the first shell sidewall is inclined from a plane where the mounting port is located towards a side close to the back plate.

[0014] In an embodiment, the frame body comprises a first frame, a second frame and a panel, the second frame is connected with the first frame to enclose a combustion chamber, and a dismounting port in communication with the combustion chamber, the combustion chamber is in communication with the air inlet, and the panel covers the dismounting port.

[0015] In an embodiment, the first frame comprises a top plate and a back plate connected by bending, the second frame comprises a bottom plate, a first side plate and a second side plate arranged on opposite sides of the bottom plate, the bottom plate is arranged opposite to the top plate, and the dismounting port is arranged opposite to the back plate.

[0016] In an embodiment, the first frame is riveted with the second frame.

[0017] In an embodiment, at least one side edge of the back plate is provided with a limiting protrusion, the limiting protrusion is in limiting cooperation with the second frame to limit installation of the second frame on the back plate.

[0018] In an embodiment, the back plate has opposite first and second side edges, the first side edge is provided with a first limiting protrusion and a second limiting protrusion at intervals, the first limiting protrusion and the second limiting protrusion are respectively in limiting cooperation with the first side plate to limit installation of the first side plate on the back plate.

[0019] The second side edge is provided with a third limiting protrusion and a fourth limiting protrusion at intervals, the third limiting protrusion and the fourth limiting protrusion are respectively in limiting cooperation with the second side plate to limit installation of the second side plate on the back plate.

[0020] In an embodiment, the back plate is provided with a limiting portion, the limiting portion is in limiting cooperation with the first side plate and / or the second side plate to limit the first side plate and / or the second side plate on the back plate.

[0021] In an embodiment, the back plate is provided with a first opening, the limiting portion comprises a first folded edge provided on the back plate, the first folded edge is arranged by bending from an edge of the first opening towards a direction close to the top plate, and the first side plate abuts one side of the first folded edge away from the top plate.

[0022] And / or, the back plate is provided with a second opening, the limiting portion comprises a second folded edge provided on the back plate, the second folded edge is arranged by bending from an edge of the second opening towards a direction close to the top plate, and the second side plate abuts one side of the second folded edge away from the top plate.

[0023] The technical scheme of the present application sets a burner in the frame body, and sets an air inlet on the burner which communicates with the mounting port of the frame body, and sets a wind cavity and an air outlet which communicates with the wind cavity on the volute of the fan, so that the air outlet and the mounting port are docked and communicated. In particular, a wind guide surface is arranged on the side edge of the volute close to the air outlet, which is arranged obliquely relative to the plane where the mounting port is located, and is used to guide the airflow of the air outlet to the side close to the air inlet. This design adopts an oblique air outlet mode, so that the fan can realize oblique air outlet and directly supply air to the air inlet of the burner. Due to the presence of the wind guide surface, the airflow is no longer in the traditional straight blowing mode, but is obliquely injected into the air inlet of the burner, which is beneficial to more sufficient premixing of the gas and air before entering the burner. Compared with the problem of insufficient primary air and insufficient gas mixing in the prior art in which the fan is placed on the left side and adopts a straight blowing mode, the technical scheme of the present application can improve the mixing uniformity of air and gas and promote a more complete combustion process, thereby reducing the high flue gas emission caused by incomplete combustion. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without creative labor for those skilled in the art.

[0025] Figure 1 The overall structure schematic diagram of an embodiment of the water heater provided by the present application;

[0026] Figure 2 The top structure schematic diagram of an embodiment of the water heater provided by the present application;

[0027] Figure 3 The partial structure schematic diagram of an embodiment of the water heater provided by the present application;

[0028] Figure 4 The local schematic diagram of an embodiment of the water heater provided by the present application;

[0029] Figure 5 The exploded view of an embodiment of the water heater provided by the present application;

[0030] Figure 6 The structure schematic diagram of an embodiment of the frame body provided by the present application;

[0031] Figure 7 The exploded view of an embodiment of the frame body provided by the present application;

[0032] Figure 8 is Figure 7 a partial enlarged view of A in the middle;

[0033] Figure 9 is Figure 7 a partial enlarged view of B in the middle;

[0034] Figure 10 is a partial schematic view of another embodiment of the water heater provided by the present application;

[0035] Figure 11 is Figure 10 a partial enlarged view of C in the middle;

[0036] Figure 12 is Figure 10 a partial enlarged view of D in the middle;

[0037] Figure 13 is a partial structural schematic view of another embodiment of the water heater provided by the present application;

[0038] Figure 14 is Figure 13 a partial enlarged view of E in the middle;

[0039] Figure 15 is a structural schematic view of an embodiment of the fan provided by the present application;

[0040] Figure 16 is an assembly schematic view of an embodiment of the fan and the frame provided by the present application.

[0041] BRIEF DESCRIPTION OF THE DRAWINGS

[0042] 100, water heater; 10, frame; 101, mounting port; 102, combustion chamber; 103, dismounting port; 104, flue; 105, first opening; 106, second opening; 11, first frame; 111, top plate; 112, back plate; 1121, first side edge; 1122, second side edge; 12, second frame; 121, bottom plate; 122, first side plate; 123, second side plate; 13, panel; 14, limiting protrusion; 141, first limiting protrusion; 142, second limiting protrusion; 143, third limiting protrusion; 144, fourth limiting protrusion; 15, limiting part; 151, first folded edge; 152, second folded edge; 20a, burner; 201, air inlet; 20b, main heat exchanger; 30, fan; 301, air cavity; 302, air inlet; 303, air outlet; 31, volute; 311, volute tongue; 312, first shell side wall; 3121, air guide surface; 40, electric control assembly; 50a, water inlet main pipe; 50b, water outlet main pipe; 60, water inlet connector; 70, gas distribution assembly; 80, first positioning part; 81, first flanging part; 82, second flanging part; 90, second positioning part; 91, second positioning flange; 911, third flanging part; 912, fourth flanging part; 9101, flange hole; 9102, second assembly part; 92, clamping tongue; 921, first guide section; 922, second guide section; 110, first positioning protrusion; 1101, first positioning matching part; 11001, notch; 11011, first groove wall; 110111, guide surface; 11012, second groove wall; 11013, groove bottom wall; 120, second positioning protrusion; 1201, second positioning matching part; 1202, second matching part; 130, shell; 1301, main air inlet; 1302, smoke outlet; 1303, air duct; 131, bottom wall; 132, top wall; 133, first side wall; 134, second side wall.

[0043] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0045] It should be noted that if the embodiments of the present application involve directionality indication (such as up, down, left, right, front, back, etc.), the directionality indication is only used to explain the relative position relationship, motion condition, etc. between components in a certain posture, and if the certain posture changes, the directionality indication also changes accordingly.

[0046] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0047] The prior art water heater places the fan on the left side and adopts a positive blowing mode to supply air to the burner, which results in insufficient primary air quantity, insufficient gas mixing, incomplete combustion, and high flue gas emission.

[0048] Based on this, the present application provides a water heater 100.

[0049] Please refer to Figures 1 to 4 In an embodiment of the present application, the water heater 100 includes a frame body 10, a burner 20a and a fan 30, the frame body 10 has a mounting port 101; the burner 20a is arranged in the frame body 10, and the burner 20a has an air inlet 201 communicating with the mounting port 101; the fan 30 is arranged in the frame body 10, and the fan 30 includes a volute 31, the volute 31 is provided with an air cavity 301 and an air outlet 303 communicating with the air cavity 301, the air outlet 303 is in butt joint and communication with the mounting port 101, and a guide surface 3121 is arranged on the side edge of the volute 31 close to the air outlet 303, the guide surface 3121 is arranged obliquely relative to the plane on which the mounting port 101 is located, and is used for guiding the airflow of the air outlet 303 to the side close to the air inlet 201.

[0050] The water heater 100 can be a condensing gas water heater 100, which can include a casing 130, a frame 10, a burner 20a, a main heat exchanger 20b and a fan 30. The casing 130 is provided with a main air inlet 1301 and an exhaust port 1302, and a wind channel 1303 is formed between the casing 130 and the burner 20a and the main heat exchanger 20b, which is in communication with the main air inlet 1301 and is used to guide the external air to enter. The frame 10 is internally provided with a flue 104 in communication with the exhaust port 1302, and the bottom is provided with a mounting port 101. The fan 30 can include a volute 31 and an impeller arranged in the volute 31, wherein the volute 31 is provided with a wind cavity 301, an air inlet 302 and an air outlet 303 in communication with the wind cavity 301, the air inlet 302 is in communication with the wind channel 1303, and the air outlet 303 is in abutment and communication with the mounting port 101. Due to the different types of condensing gas water heaters 100, the arrangement of the burner 20a, the main heat exchanger 20b and the fan 30 can be different, and the present application is suitable for strong suction type or strong drum type gas water heater 100. Taking the strong drum type gas water heater 100 as an example, the burner 20a and the main heat exchanger 20b are arranged in the frame 10, and the fan 30, the burner 20a and the main heat exchanger 20b are arranged in the casing 130 from bottom to top along the height direction of the frame 10. The burner 20a is arranged in the frame 10 close to the mounting port 101, and the burner 20a has a premixing cavity, an air inlet 201 and an air outlet in communication with the premixing cavity, the air inlet 201 is in communication with the mounting port 101, and the air outlet is in communication with the smoke inlet end of the flue 104, and the smoke outlet end of the flue 104 is connected to the exhaust port 1302 of the casing 130; the main heat exchanger 20b is located at the top of the frame 10, which includes at least part of the main heat exchanger pipe extending into the flue 104, which is used to absorb the heat of the high-temperature flue gas to heat the water flowing in the pipe. The space between the burner 20a and the main heat exchanger 20b in the frame 10 forms a combustion chamber 102, which is in communication with the air outlet of the burner 20a, so that the air blown by the fan 30 enters the combustion chamber 102 through the air outlet to provide the primary air required for the combustion of the burner 20a, and the flame is fully burned in the combustion chamber 102 to generate high-temperature flue gas, which flows through the flue 104 under the drive of the fan 30 to heat the water in the main heat exchanger pipe, realizing efficient heat exchange. At the same time, the fan 30 can also guide the air entering from the main air inlet 1301 into the burner 20a to provide secondary air to promote more complete and stable combustion.

[0051] However, as mentioned above, in the prior art, the blower 30 is positioned on the left side of the frame 10 relative to the burner 20a. In this case, the air outlet 303 of the blower 30 is directly opposite the air inlet 201 of the burner 20a via the mounting port 101. The blower 30 supplies air to the burner 20a in a forward blowing manner, resulting in uneven airflow distribution. It forcibly pushes air from only one side, making it difficult for the gas and air to achieve uniform and sufficient premixing in the mixing chamber. At the same time, the air pressure formed by the forward blowing method can easily cause local overpressure at the air inlet 201 of the burner 20a, disrupting the normal airflow field, inhibiting the intake of primary air, resulting in a low primary air coefficient, insufficient air in the mixture, and ultimately causing incomplete combustion, uneven flame temperature, and the emission of more harmful flue gases such as carbon monoxide and nitrogen oxides, as well as low thermal efficiency.

[0052] To address the problems of insufficient primary air, incomplete gas mixing, incomplete combustion, and high pollutant emissions caused by the side-mounted fan 30 and forward air supply in the prior art, this invention provides an air guide surface 3121 on the edge of the volute 31 near the air outlet 303. The air guide surface 3121 is inclined relative to the plane where the mounting port 101 is located. Taking the axis of the mounting port 101 extending vertically as an example, the plane where the mounting port 101 is located is perpendicular to this axis. Based on this, the air guide surface 3121 gradually deflects towards the side closer to the air inlet 201 of the burner 20a along the airflow direction, forming an inclined guide structure with a guiding function, used to guide the outlet airflow to the area of ​​the air inlet 201 of the burner 20a.

[0053] Through the design of the inclined air guide surface 3121, although the fan 30 is still arranged on one side of the burner 20a (such as the left side), its outlet airflow is no longer directly facing or parallel to the plane of the mounting port 101, but is rectified by the air guide surface 3121 into an oblique jet pointing towards the air inlet 201 of the burner 20a. This directional airflow method can significantly enhance the disturbance and mixing effect of air with gas when entering the premixing chamber, promote the formation of a spiral flow or convection mixing structure, and greatly improve the mixing uniformity and premixing efficiency of gas and air. This results in more complete combustion, improved combustion conditions, reduced generation of incomplete combustion products such as carbon monoxide, increased thermal efficiency, and reduced emissions of flue gas pollutants.

[0054] like Figure 4 As shown, in some embodiments, the air guide surface 3121 can constitute a partially obliquely cut structure of the volute 31 itself. That is, the volute 31 is provided with a first shell sidewall 312, which is inclined relative to the plane where the mounting port 101 is located, and its inner wall surface directly serves as the air guide surface 3121. This integrated design allows the air guide surface 3121 to be processed simultaneously during the molding process of the volute 31, simplifying the manufacturing process and reducing production costs without weakening the structural strength of the volute 31.

[0055] In other embodiments, the air guide surface 3121 can be achieved by adding additional structures such as guide plates and guide ribs to the edge of the air outlet 303 of the volute 31. Such detachable or adjustable air guide elements not only facilitate flexible adaptation to different burner 20a models and air intake directions, but also benefit later maintenance and structural iteration optimization, thereby improving the product's versatility, manufacturability, and assembly flexibility.

[0056] The surface of the air guide surface 3121 is preferably designed with a smooth arc transition structure to reduce boundary layer separation and turbulent resistance when the airflow passes through, reduce energy loss, and improve air guiding efficiency and air transport performance.

[0057] It is worth noting that the tilt angle of the air guide surface 3121 needs to be optimized based on the specific air volume and pressure requirements, as well as the structural parameters of the burner 20a. Experimental verification shows that the angle θ formed between the air guide surface 3121 and the plane containing the mounting port 101 should ideally be controlled within the range of 65 to 75 degrees. Within this range, optimal airflow deflection and mixing performance can be achieved while minimizing air volume loss. This is because: when θ is less than 65 degrees, the air guide surface 3121 is too steep, and the airflow deflection angle is too large, easily causing severe airflow separation and vortex phenomena at the air outlet 303, resulting in significant air pressure attenuation and flow rate reduction, affecting air supply capacity; when θ is greater than 75 degrees, the air guiding effect weakens, the airflow deflection is insufficient, and it is difficult to effectively concentrate the airflow towards the central area of ​​the burner 20a air inlet 201, resulting in limited mixing disturbance effect, still approaching the adverse effects of the traditional forward blowing mode. Experiments have shown that when θ is not less than 65 degrees and not greater than 75 degrees, the airflow transition is smooth and stable. This can maintain a high wind pressure transmission efficiency and accurately guide the airflow into the premixing chamber, increasing the proportion of primary air participating in the mixing by more than 15%, thereby enhancing combustion stability and cleanliness.

[0058] like Figures 1 to 4 As shown, in one embodiment, the frame 10 includes a back plate 112 and a front panel 13 facing each other, and a bottom plate 121 connecting the back plate 112 and the front panel 13. The air inlet 201 is disposed facing the front panel 13, and the mounting port 101 is disposed on the bottom plate 121.

[0059] In the embodiment, the frame 10 comprises a back plate 112, a face plate 13 and a bottom plate 121, the back plate 112 and the face plate 13 are oppositely arranged along the front-rear direction, and the bottom plate 121 connects the back plate 112 and the face plate 13. In this structural layout, the axis of the air inlet 201 extends along the front-rear direction and is perpendicular to the plane where the face plate 13 is located, ensuring that the gas or mixture flows smoothly into the burner 20a from the front side; and the axis of the mounting port 101 extends along the up-down direction, for mounting the fan 30 so that it takes in air from the bottom of the frame 10 and forms a vertical upward air outlet path. In combination with the guiding effect of the aforementioned air guide surface 3121, the airflow at the air outlet 303 of the fan 30 is deflected into a forward-upward inclined jet, accurately pointing to the air inlet 201 of the burner 20a located at the front side. This "bottom air intake, front air outlet" air supply path not only avoids the one-sided impact and disturbance on the air inlet flow field of the burner 20a caused by the traditional left-side straight-blowing fan 30, but also forms more uniform and sufficient air-gas premixing in the air inlet 201 area through reasonable guidance of the airflow direction, effectively improving the participation ratio and mixing efficiency of the primary air, thereby improving the combustion stability, increasing the thermal efficiency and reducing the pollutant emissions.

[0060] As shown in the drawings, Figures 1 to 4 In an embodiment, the back plate 112 and the face plate 13 are oppositely arranged along a first direction, the volute 31 is further provided with an air inlet 302 communicating with the air cavity 301, the axis of the air inlet 302 extends along a second direction, and the side of the volute 31 away from the back plate 112 does not exceed the plane where the face plate 13 is located, and the first direction intersects the second direction.

[0061] As can be seen from the above embodiments, the back plate 112 and the face plate 13 are oppositely arranged along the front-rear direction, i.e. the front-rear direction is the first direction. The axis of the air inlet 302 of the volute 31 extends along the left-right direction, i.e. the left-right direction is the second direction. It is worth noting that the side of the volute 31 away from the back plate 112 does not exceed the plane where the face plate 13 is located, which means that the side of the volute 31 away from the back plate 112 can be located between the back plate 112 and the face plate 13 and close to the face plate 13, or flush with the plane where the face plate 13 is located. Such a design benefits from the presence of the air guide surface 3121, which allows the volute 31 to be compactly arranged on the side away from the back plate 112 without having to expand outward beyond the position of the face plate 13, optimizes the space utilization inside the machine housing 130, and makes the entire machine not too thick. Therefore, it can be said that the design of the air guide surface 3121 enables the volute 31 to efficiently complete the direction conversion of the airflow while maintaining a compact shape, thereby realizing the "bottom air intake, front air outlet" air supply path and promoting the uniform mixing of air and gas in the air inlet 201 area to achieve more complete combustion.

[0062] As shown in the drawings, Figures 1 to 4As shown, in an embodiment, the side of the volute 31 away from the back plate 112 is arranged to be flush with the plane where the panel 13 is located.

[0063] In the embodiment, by arranging the side of the volute 31 away from the back plate 112 to be flush with the plane where the panel 13 is located, compared with the case where the side of the volute 31 away from the back plate 112 is located between the back plate 112 and the panel 13 and close to the panel 13, a larger internal space of the volute 31 can be provided. This means that the volute 31 has more volume for optimizing the air cavity 301, reducing air flow resistance, and improving the working efficiency of the fan 30.

[0064] As shown, Figures 1 to 4 In an embodiment, the volute 31 has a volute tongue 311 and a first shell side wall 312 opposite to the volute tongue 311, and the inner wall of the first shell side wall 312 has a guide surface 3121.

[0065] Based on the above embodiment, it is further illustrated that the volute 31 in the embodiment has the volute tongue 311 and the first shell side wall 312, which are oppositely arranged along the front-rear direction, the volute tongue 311 is arranged close to the panel 13 relative to the first shell side wall 312, and the first shell side wall 312 is arranged away from the panel 13 relative to the volute tongue 311. The inner wall of the first shell side wall 312 at the position close to the air outlet 303 is provided with the guide surface 3121. This means that the guide surface 3121 is not realized by additionally adding a guide plate or a guide rib, but is locally formed by the inner wall of the first shell side wall 312 itself. The guide surface 3121 is directly formed on the inner wall of the first shell side wall 312, without the need to introduce a separate guide plate or guide rib, so that the effective air flow guiding function can be directly formed on the original structure of the volute 31, which can maintain the integrity and strength of the overall structure of the volute 31, and can avoid the process complexity and potential connection defects caused by assembling additional guide plates or guide ribs; at the same time, since the guide surface 3121 is integrally formed with the volute 31, the surface can realize smooth and continuous transition, reduce air flow separation and vortex loss, improve the guide efficiency, and be conducive to reducing wind noise and energy loss.

[0066] As shown, Figures 1 to 4As shown, in an embodiment, the first shell side wall 312 is arranged to be inclined from the plane where the mounting opening 101 is located to the side close to the back plate 112. This means that the entire inner wall of the first shell side wall 312 constitutes the air guide surface 3121, rather than only the air guide surface 3121 formed on the inner wall. Compared with the way of additionally arranging the air guide surface 3121 on the inner wall of the already formed first shell side wall 312, directly designing the entire first shell side wall 312 as an inclined structure so that it bears the air guide function as a whole has significant manufacturing and structural advantages: the air guide surface 3121 can be completed synchronously in the overall forming process of the volute 31, without the need for subsequent secondary processing or assembling air guide plates, air guide ribs and other air guide elements, realizing the integrated manufacturing with the volute 31. This not only can simplify the production process and reduce the assembly cost, but also can avoid the risks of loose connection, poor sealing or airflow disturbance caused by additional air guide plates, air guide ribs and other air guide elements, improving the reliability and consistency of the structure.

[0067] As shown in Figures 1 to 4 , in some embodiments, the first shell side wall 312 can adopt a broken line segment structure, or an arc segment structure. When the first shell side wall 312 is a broken line segment, its inner wall is composed of multiple connected plane segments, forming a stepped or broken line air guide surface 3121. This structure is good in processing workability and can provide a clear airflow guide angle, facilitating mold demolding. When the first shell side wall 312 is an arc segment, its inner wall is a smooth continuous curved surface, which can make the airflow turn more smoothly, effectively reducing turbulence and flow separation, reducing wind resistance and noise, and improving the air guide efficiency. Therefore, according to the actual aerodynamic performance requirements and manufacturing process conditions, the specific profile form of the first shell side wall 312 can be flexibly selected to ensure good air guide effect while taking into account the production feasibility and cost control.

[0068] As shown in Figure 5 and Figure 6 , in an embodiment, the frame body 10 includes a first frame 11, a second frame 12 and a panel 13. The second frame 12 is connected with the first frame 11 to enclose a combustion chamber 102, and a dismounting opening 103 in communication with the combustion chamber 102. The combustion chamber 102 is in communication with the air inlet 201, and the panel 13 is arranged on the dismounting opening 103.

[0069] It can be understood that the condensing gas water heater 100 in the prior art is usually composed of a panel 13 and three or more mutually independent frames to form a frame body 10, and the adjacent frames need to be connected step by step, involving multiple assembly processes, which is complicated and time-consuming, not only increasing the production complexity, but also reducing the assembly efficiency of the whole machine. The embodiment simplifies the frame body 10 into a first frame 11, a second frame 12 and a panel 13. By connecting the first frame 11 and the second frame 12 to complete the assembly of the main structure of the frame body 10 in one operation, the connection nodes and assembly steps can be reduced. After the burner 20a is installed below the combustion chamber 102 and the main heat exchanger 20b is placed in the flue 104 above the combustion chamber 102, the panel 13 is finally covered on the disassembly opening 103, and the assembly and overall sealing of the burner 20a, the main heat exchanger 20b and other components can be realized. The frame body 10 structure not only simplifies the assembly process and improves the production efficiency, but also helps to reduce the potential air leakage points and improve the structural stability and sealing reliability of the frame body 10 as a whole.

[0070] Further, the specific structure of the first frame 11 and the second frame 12 can have various implementation manners. As shown in Figure 5 and Figure 6 In an embodiment, the first frame 11 includes a top plate 111 and a back plate 112 integrally bent and formed, and the second frame 12 includes a bottom plate 121 and a first side plate 122 and a second side plate 123 arranged on opposite sides of the bottom plate 121. Among them, the bottom plate 121 is arranged opposite to the top plate 111, and the disassembly opening 103 is located on the opposite side of the back plate 112, which is convenient for the installation and later maintenance of the burner 20a, the main heat exchanger 20b and other components; the bottom plate 121 is also provided with a mounting opening 101 for mounting the fan 30. The first frame 11 is integrally bent and formed with the top plate 111 and the back plate 112, which can reduce the use of spliced welds or fasteners, and improve the integrity and stiffness of the frame body 10; the second frame 12 forms a "U" shaped structure through the bottom plate 121 and the two side plates, which has good bearing capacity and anti-deformation performance. After the two are connected, a skeleton structure similar to a box body is formed, and the disassembly opening 103 is closed by the panel 13, so that a complete, easy-to-assemble and maintain combustion chamber 102 can be formed.

[0071] As shown in Figure 5 and Figure 6 In an embodiment, the first frame 11 and the second frame 12 are riveted.

[0072] In the present embodiment, the first frame 11 and the second frame 12 are fixed by riveting. The connection between the first frame 11 and the second frame 12 can be achieved by two ways. One way is to wrap the edge of the first frame 11 around the corresponding edge of the second frame 12, which means that part of the structure of the first frame 11 will surround and fasten the edge of the second frame 12, thereby forming a stable joint. This way uses the edge of the first frame 11 to enhance the stability and rigidity of the overall structure. The other way is the opposite operation, that is, the edge of the second frame 12 wraps around the corresponding edge of the first frame 11. This means that part of the structure of the second frame 12 will surround and fasten the edge of the first frame 11, which can also form a stable joint. Such a design not only ensures the close connection between the first frame 11 and the second frame 12, but also allows flexible selection of which side to be the main force-bearing surface according to actual needs.

[0073] Either of the above riveting methods or both of them can ensure that the first frame 11 and the second frame 12 have sufficient mechanical strength and stability, reducing the risk of loosening due to vibration or other external forces. In addition, riveting as a reliable permanent connection method does not require additional welding procedures, which can reduce the problem of heat-affected zone, simplify the manufacturing process, and help improve production efficiency and product quality consistency.

[0074] To improve the accuracy of riveting between the first frame 11 and the second frame 12, as shown in an embodiment, at least one side edge of the back plate 112 is provided with a limiting protrusion 14, which is limited and matched with the second frame 12 to limit the installation of the second frame 12 on the back plate 112. Figure 7

[0075] ​In the embodiment, at least one side edge of the back plate 112 is provided with the limiting protrusions 14. For example, one side edge of the back plate 112 corresponding to the bottom plate 121 is provided with the limiting protrusions 14, or one side edge of the back plate 112 corresponding to the first side plate 122 is provided with the limiting protrusions 14, or one side edge of the back plate 112 corresponding to the second side plate 123 is provided with the limiting protrusions 14, or one side edge of the back plate 112 corresponding to the bottom plate 121 and the first side plate 122 is provided with the limiting protrusions 14, and the like. Each side edge of the back plate 112 can be provided with one or more limiting protrusions 14 as needed. When a side edge is provided with multiple limiting protrusions 14, the multiple limiting protrusions 14 can be arranged in one or more rows along the length direction of the back plate 112, or arranged in one or more rows along the width direction of the back plate 112, which is not specifically limited herein. By limiting the second frame 12 to the limiting protrusions 14, the second frame 12 can be limitedly installed on the back plate 112. After the second frame 12 is limited, the riveting of the first frame 11 and the second frame 12 can be facilitated, and the unnecessary displacement of the first frame 11 or the second frame 12 during riveting can be prevented, thereby avoiding the riveting problem caused by the position change.

[0076] As shown in FIG. 1, Figure 7 In an embodiment, the back plate 112 has opposite first and second side edges 1121 and 1122. The first side edge 1121 is provided with a first limiting protrusion 141 and a second limiting protrusion 142 which are respectively limited to the first side plate 122 to limit the installation of the first side plate 122 on the back plate 112. The second side edge 1122 is provided with a third limiting protrusion 143 and a fourth limiting protrusion 144 which are respectively limited to the second side plate 123 to limit the installation of the second side plate 123 on the back plate 112.

[0077] In the embodiment, the first and second limiting protrusions 141 and 142 are respectively limited to the first side plate 122 to limit the installation of the first side plate 122 on the back plate 112, and the third and fourth limiting protrusions 143 and 144 are respectively limited to the second side plate 123 to limit the installation of the second side plate 123 on the back plate 112. Since the first and second side plates 122 and 123 are effectively limited, the entire second frame 12 can be relatively balanced on the back plate 112, thereby providing a stable basis for the riveting between the first and second frames 11 and 12, and avoiding the riveting problem or error caused by the relative movement between the first and second frames 11 and 12.

[0078] In addition, by providing the limiting protrusions 14 on the opposite side edges of the back plate 112, the assembly process can be simplified and the production efficiency can be improved. This is because the design of the limiting protrusions 14 can reduce the need for manual or mechanical adjustment and calibration, so that the first frame 11 and the second frame 12 of each frame body 10 can be quickly and accurately assembled. Each limiting protrusion 14 is tightly fitted with the corresponding side plate, which can further enhance the rigidity and stability of the entire frame body 10.

[0079] As shown in FIG. 1, in an embodiment, the first limiting protrusion 141 and the third limiting protrusion 143 are oppositely arranged along the second direction; and / or, the second limiting protrusion 142 and the fourth limiting protrusion 144 are oppositely arranged along the second direction. Figure 7

[0080] In the present embodiment, the opposite arrangement of the first limiting protrusion 141 and the third limiting protrusion 143 enables the first side plate 122 and the second side plate 123 to be evenly supported and positioned on the opposite sides of the back plate 112, thereby preventing the second frame 12 from being tilted or asymmetric during the assembly process. Similarly, if the second limiting protrusion 142 and the fourth limiting protrusion 144 are also oppositely arranged along the second direction, the symmetry and stability between the first side plate 122 and the second side plate 123 can be further enhanced, which helps to maintain the balance of the second frame 12.

[0081] As shown in FIG. 1, in an embodiment, the back plate 112 is provided with a limiting portion 15, which is in limiting cooperation with the first side plate 122 and / or the second side plate 123 to limit the first side plate 122 and / or the second side plate 123 to the back plate 112. Figures 7 to 9

[0082] In the present embodiment, the limiting portion 15 can be a groove or a protrusion provided on the back plate 112, and correspondingly, at least one of the first side plate 122 and the second side plate 123 is also provided with a matching groove or protrusion. By the cooperation of the groove and the protrusion, the positioning of the first side plate 122 and the second side plate 123 relative to the back plate 112 is achieved. For example, when the limiting portion 15 includes a groove provided on the back plate 112, the first side plate 122 is equipped with a corresponding protrusion, so that the protrusion of the first side plate 122 can be embedded in the groove of the back plate 112, thereby achieving the positioning of the first side plate 122 relative to the back plate 112. Similarly, if the second side plate 123 also adopts the same structure, i.e. it itself has a protrusion, the limiting effect can be achieved by the cooperation of the protrusion with the corresponding groove on the back plate 112. In this way, it can be ensured that the first side plate 122 and the second side plate 123 can be accurately installed on the back plate 112, thereby improving the accuracy of the riveting between the first frame 11 and the second frame 12, and reducing the assembly errors caused by the mispositioning of at least one of the first frame 11 and the second frame 12. ​​

[0083] In addition, the limiting part 15 may also include other types of limiting devices such as buckles provided on the back plate 112. Buckles can provide additional fixing force during the initial assembly process to ensure that the first side plate 122 and / or the second side plate 123 will not move accidentally, which facilitates the subsequent riveting operation between the first frame 11 and the second frame 12 and improves the accuracy and reliability of the riveting.

[0084] like Figure 7 and Figure 8 As shown, in one embodiment, the back panel 112 is provided with a first opening 105, and the limiting part 15 includes a first folded edge 151 provided on the back panel 112. The first folded edge 151 is bent from the edge of the first opening 105 toward the direction close to the top panel 111, and the first side panel 122 abuts against the side of the first folded edge 151 away from the top panel 111.

[0085] In this embodiment, the back panel 112 has a first opening 105, and the limiting part 15 includes a first folded edge 151 provided on the back panel 112. The first folded edge 151 is bent from the edge of the first opening 105 toward the direction close to the top panel 111, so that the first side panel 122 can abut against the side of the first folded edge 151 away from the top panel 111. By using the first folded edge 151 as the limiting part 15, it can be ensured that the first side panel 122 can be accurately positioned on the back panel 112 during assembly, and additional support and stability can be provided to prevent the first side panel 122 from shifting or tilting during assembly, thereby improving the riveting accuracy of the first frame 11 and the second frame 12. At the same time, the presence of the first folded edge 151 can also reduce the need for additional fasteners, thereby simplifying the manufacturing process of the frame 10 and reducing costs.

[0086] like Figure 7 and Figure 8 As shown, in one embodiment, the back panel 112 has a second opening 106, and the limiting portion 15 includes a second folded edge 152 provided on the back panel 112. The second folded edge 152 is bent from the edge of the second opening 106 toward the top panel 111, and the second side panel 123 abuts against the side of the second folded edge 152 away from the top panel 111. Similarly, the second folded edge 152 can provide positioning and support for the second side panel 123, maintain the positional accuracy of the second side panel 123, and ensure that the second side panel 123 will not shift or tilt on the back panel 112 during installation, thereby improving the riveting accuracy of the first frame 11 and the second frame 12.

[0087] It should be noted that when the air inlet direction of the air inlet 302 and the air inlet direction of the main air inlet 1301 are located on the same side, for example, both are front-back direction, it will cause the air inlet 302 and the main air inlet 1301 to be too close, the air inlet channel is narrow, and the air inlet resistance increases; at the same time, the noise generated by the airflow during operation is easy to directly spread outward along the air inlet path, lacking effective blocking, thereby seriously affecting the quiet performance of the whole machine.

[0088] To improve the above problems, as shown in Figure 1 In an embodiment, the air inlet direction of the air inlet 302 of the fan 30 intersects the air inlet direction of the main air inlet 1301 of the cabinet 130. If the air inlet direction of the main air inlet 1301 of the cabinet 130 is up-down direction, the air inlet direction of the air inlet 302 of the fan 30 can be designed as left-right direction; similarly, if the air inlet direction of the main air inlet 1301 is set as front-back direction, the air inlet direction of the fan 30 can be adjusted to left-right direction. Through such layout adjustment, not only the spatial distance between the air inlet 302 of the fan 30 and the main air inlet 1301 of the cabinet 130 can be pulled apart, but also the airflow channel can be widened, the air flow resistance can be reduced, and the air inlet efficiency can be improved. In addition, since the air inlet path is no longer in straight line alignment, the noise will encounter more blocking and refraction during propagation, and it is difficult to directly spread outward from the main air inlet 1301, thereby reducing the possibility of noise leakage and improving the quiet performance of the whole machine.

[0089] Moreover, the air duct 1303 in the present application is formed by the space between the cabinet 130 and the combustion heat exchange assembly. Compared with the prior art which needs to embed the air duct assembly, the present application can eliminate the need to additionally set the air duct 1303 assembly, and directly utilize the space inside the cabinet 130 for air inlet. This not only can simplify the internal structure of the water heater 100, reduce the number of parts, but also can reduce the assembly difficulty and cost. In addition, since no installation space needs to be reserved for the additional air duct 1303 assembly, this design makes the overall layout more compact, which helps to reduce the device volume and improve the space utilization. More importantly, by optimizing the space layout inside the cabinet 130 to form the air duct 1303, the air flow can be more effectively guided, the energy loss caused by poor air flow is reduced, and the combustion efficiency and heat exchange efficiency are improved.

[0090] As shown in Figure 1 In an embodiment, the cabinet 130 has opposite bottom wall 131 and top wall 132, the top wall 132 is provided with the main air inlet 1301, and the fan 30 is arranged on the side of the combustion heat exchange assembly close to the bottom wall 131.

[0091] In the embodiment, the cabinet 130 has a bottom wall 131 and a top wall 132 arranged opposite to each other in the up-down direction, the main air inlet 1301 is arranged on the top wall 132, and the fan 30 is arranged on the side of the combustion heat exchange assembly close to the bottom wall 131, i.e., on the side of the combustion heat exchange assembly away from the main air inlet 1301. In this way, by arranging the fan 30 in the bottom area of the cabinet 130 and arranging the main air inlet 1301 in the top area of the cabinet 130, the air inlet paths can be vertically separated in space, and the straight-line distance between the main air inlet 1301 and the air inlet 302 is increased. This vertically staggered layout makes the external air enter from the upper part of the cabinet 130, flow downward through the air duct 1303 between the cabinet 130 and the combustion heat exchange assembly, and then enter the air inlet 302 from below, thereby forming a folded air inlet channel, avoiding air flow short circuit and air inlet congestion, greatly reducing air inlet resistance, and improving air inlet uniformity and stability. At the same time, since the air flow needs to pass through a long and curved path before entering the fan 30, the aerodynamic noise generated during operation is reflected, absorbed and attenuated multiple times by the structure of the air duct 1303 during propagation, and it is difficult to directly radiate outward along a straight line, thereby enhancing the noise reduction capability of the entire machine. At this time, the air inlet direction of the main air inlet 1301 can be toward the up-down direction or toward the front-back direction. When the main air inlet 1301 is upward, the air inlet 302 of the fan 30 can be designed to be left-right air inlet; when the main air inlet 1301 is front-back air inlet, the air inlet 302 of the fan 30 can be designed to be up-down or left-right air inlet. As long as the air inlet direction of the air inlet 302 of the fan 30 intersects with the air inlet direction of the main air inlet 1301 in space, the air inlet paths can be staggered in space, thereby optimizing the air flow field and reducing the noise propagation efficiency.

[0092] As shown in FIG. 1, Figure 1 In an embodiment, the cabinet 130 has a first side wall 133 connecting the bottom wall 131 and the top wall 132, the main air inlet 1301 is arranged toward the bottom wall 131, and the air inlet 302 of the fan 30 is arranged toward the first side wall 133.

[0093] In the embodiment, by arranging the main air inlet 1301 toward the bottom wall 131, i.e., the air inlet direction of the main air inlet 1301 is upward, and arranging the air inlet 302 of the fan 30 toward the first side wall 133, i.e., the air inlet direction is left-right, air entering the main air inlet 1301 on the top wall 132 of the cabinet 130 flows downward directly, and then is guided to the air inlet 302 of the fan 30 through the air duct 1303 near the first side wall 133. This design reduces the turning of the air flow path, thereby reducing the vortex phenomenon formed by the air flow during transmission. Since the irregular movement of the air flow is reduced, the air inlet efficiency can be improved, and the additional noise caused by the vortex can be reduced.

[0094] It is worth noting that the main air inlet 1301 can be located close to or away from the first sidewall 133. When the main air inlet 1301 is located away from the first sidewall 133, the air enters from the main air inlet 1301 on the top wall 132 of the casing 130 and flows directly downwards, potentially taking a relatively long path, first moving away from the first sidewall 133 and then approaching it again, finally being guided to the air inlet 302 of the fan 30. Although this arrangement can utilize a longer path to further reduce noise, the extended path and multiple turns may increase airflow resistance and energy loss. Conversely, as... Figure 1 and Figure 2 As shown, when the main air inlet 1301 is positioned close to the first side wall 133, the airflow path between the main air inlet 1301 and the air inlet 302 of the fan 30 is approximately a straight path. This not only reduces the energy loss of the airflow during transmission, but also avoids other components in the duct 1303 from obstructing the airflow path, making the airflow smoother and more efficient.

[0095] Furthermore, positioning the main air inlet 1301 close to the first sidewall 133 optimizes internal airflow organization, reduces energy loss, and helps improve combustion and heat exchange efficiency. Specifically, when air enters the fan 30 in a more straight line, a more stable airflow supply is ensured, which is crucial for maintaining the optimal operating condition of the burner 20a. A more stable and uniform airflow not only promotes complete combustion during the combustion process and reduces the emission of harmful substances, thus benefiting environmental protection, but also reduces the impact of unnecessary airflow turning and bending on the fan 30 blades, thereby extending the service life of the fan 30 and reducing maintenance costs.

[0096] like Figure 1 As shown, in one embodiment, the housing 130 also has a second sidewall 134 opposite to the first sidewall 133, and the water heater 100 also includes an electronic control component 40, which is disposed between the second sidewall 134 and the combustion heat exchange component.

[0097] In this embodiment, the housing 130 also has a second sidewall 134 opposite to the first sidewall 133, and the second sidewall 134 and the first sidewall 133 are arranged opposite each other in the left-right direction. The water heater 100 also includes an electronic control component 40, which can be implemented using control components such as a controller and a main control board, and can be electrically connected to electronic components such as the burner 20a to realize the operation control of electronic components such as the burner 20a. In order to optimize the internal layout and make full use of space, the electronic control component 40 is set between the second sidewall 134 and the combustion heat exchange component. This arrangement not only makes the internal structure of the housing 130 more compact and reasonable, which helps to reduce the overall volume of the water heater 100, but also effectively utilizes the internal space of the housing 130.

[0098] More importantly, the space between the second side wall 134 and the combustion heat exchange assembly forms an air duct 1303 which is in communication with the main air inlet 1301. When air enters from the main air inlet 1301 and flows through the air duct 1303, the electric control assembly 40 located in the air duct 1303 can be cooled. The electric control assembly 40 generates heat during actual operation. If the heat accumulates in the cabinet 130, it may adversely affect sensitive electronic components in the electric control assembly 40 and components such as the fan 30 in the cabinet 130, and even shorten their service life. Through the above design, the air flowing through the air duct 1303 not only provides the necessary oxygen for the combustion process, but also carries away the excess heat generated by the electric control assembly 40, achieving effective cooling effect. At the same time, this layout also facilitates maintenance personnel to check and repair the electric control assembly 40, without the need to disassemble the complex combustion heat exchange assembly to access the electric control assembly 40, greatly improving the maintenance convenience.

[0099] It can be understood that the shape of the main air inlet 1301 can be circular, square, strip-shaped or other irregular shapes, etc. Figure 1 As shown in an embodiment, the main air inlet 1301 is strip-shaped, and the width of the main air inlet 1301 is not greater than 10 mm.

[0100] In this embodiment, by setting the shape of the main air inlet 1301 as strip-shaped, the air inlet area can be effectively controlled while achieving uniform and stable airflow distribution. The strip-shaped structure has a long air inlet side length, which can reduce the local air inlet speed and reduce the turbulence intensity when the airflow enters under the same opening area, thereby helping to reduce the air inlet noise. At the same time, the strip-shaped main air inlet 1301 can be arranged extending along the thickness direction of the top wall 132 of the cabinet 130, forming a narrow-slit air inlet channel with a certain depth. This structure has good barrier effect on sound wave propagation, can suppress the linear outward radiation of the medium-high frequency airflow noise generated when the fan 30 operates, has the effect of silencing, and further improves the quietness of the whole machine.

[0101] In addition, multiple strip-shaped main air inlets 1301 can be provided, and the multiple main air inlets 1301 can be arranged in the left-right direction. In this way, the air inlet area can be dispersedly arranged under the premise of ensuring sufficient total air inlet amount, so that air enters the air duct 1303 synchronously from multiple main air inlets 1301, avoiding local vortex or uneven pressure caused by the air flow concentrated in a single main air inlet 1301, thereby optimizing the airflow organization inside the whole machine and improving the uniformity and stability of the air inlet. This distributed air inlet design can also effectively reduce the peak value of the air speed at the single air inlet 302, further reduce the airflow impact noise, and enhance the quietness effect.

[0102] Meanwhile, the width of the main air inlet 1301 is not greater than 10 mm, which can effectively prevent adults or children from accidentally inserting their fingers into the interior of the machine shell 130 and touching the high-temperature or moving parts inside the machine shell 130, thereby improving the use safety of the water heater 100. In addition, the narrow strip-shaped main air inlet 1301 can also effectively block external foreign objects from entering the interior of the machine shell 130, for example, mice, cockroaches and other pests are difficult to invade the interior of the equipment through such main air inlets 1301, thereby avoiding electrical faults such as short circuit and electric leakage caused by the biting of wires by mice and rats, and ensuring the electrical safety of equipment operation. At the same time, it can also prevent a large amount of dust, fallen leaves, debris and other sundries from accumulating or blocking the air duct 1303, ensuring smooth air intake, and avoiding safety hazards such as insufficient combustion, heat efficiency reduction, and carbon monoxide concentration increase in flue gas. For the fan 30, this design can also reduce the risk of foreign objects being sucked into the impeller or volute 31, preventing abnormal vibration, increased noise, and even fan 30 stoppage caused by this, thereby improving the reliability and durability of the entire machine operation.

[0103] As shown in FIG. 1, in an embodiment, the area of the main air inlet 1301 is not less than twice the area of the air inlet 302 of the fan 30. Figure 1

[0104] In this embodiment, the area of the main air inlet 1301 is not less than twice the area of the air inlet 302 of the fan 30, which means that the main air inlet 1301 has a large cross-sectional size, much larger than the area of the air inlet 302 of the fan 30. On the one hand, the large area of the main air inlet 1301 can ensure sufficient air supply, which can meet the oxygen demand for combustion even under extreme use conditions, ensuring the efficiency and stability of the combustion process. On the other hand, due to the large area of the main air inlet 1301, the speed of air entering is relatively low, which helps to reduce the turbulence and noise generated when the air flow enters, making the air intake more smooth and uniform, thereby reducing the vibration and noise problems caused by high-speed air flow impact, and further improving the quietness of the entire machine.

[0105] In addition, the larger area of the main air inlet 1301 can also reduce the air intake resistance, making it easier for air to be introduced into the interior of the machine shell 130 and smoothly pass through the entire air duct 1303 to the air inlet 302 of the fan 30. This is crucial for improving the working efficiency of the fan 30, as it can reduce the energy consumed by the fan 30 to overcome the intake resistance, allowing more energy to be used for maintaining effective air flow and combustion process. At the same time, low-resistance air intake design can also help to reduce the load of the fan 30, prolonging its service life, as the fan 30 does not need to operate at a higher power to compensate for excessive intake resistance.

[0106] As shown in FIG. 1, in an embodiment, the area of the main air inlet 1301 is not less than twice the area of the air inlet 302 of the fan 30. Figure 1 ​As shown, in one embodiment, the water heater 100 further includes a main water inlet pipe 50a, the outlet end of the main water inlet pipe 50a is connected to the inlet end of the combustion heat exchange component, the housing 130 is provided with an inlet connector 60, the inlet end of the main water inlet pipe 50a is connected to the inlet connector 60, and the fan 30 is located near the inlet connector 60.

[0107] In this embodiment, the casing 130 is provided with an inlet main pipe 50a and an outlet main pipe 50b, which are respectively connected to the inlet and outlet ends of the main heat exchanger 20b. When the condensing gas water heater 100 is running, the burner 20a generates high-temperature flue gas. Under the action of the fan 30, this high-temperature flue gas is guided to the main heat exchanger 20b for heat exchange, thereby heating the cold water flowing through the main heat exchange tubes. The heated hot water is then output to the user through the outlet main pipe 50b. The casing 130 is also provided with an inlet connector 60, and the inlet end of the inlet main pipe 50a is directly connected to the inlet connector 60, so that cold water can smoothly enter the water heater 100 for heating. In particular, the fan 30 is arranged close to the inlet connector 60, which can utilize the inlet pipe as a natural radiator to a certain extent, helping to reduce the temperature generated by the fan 30 during operation and extend its service life. Since the area through which the chilled water passes before entering the main heat exchanger 20b is usually at a lower temperature, this arrangement can provide a relatively cool operating environment for the fan 30, which is especially important during long-term operation or high-load operation.

[0108] like Figure 1 As shown, in one embodiment, the water heater 100 further includes a gas distribution assembly 70, which is disposed inside the housing 130. The gas distribution assembly 70 and the water inlet connector 60 are arranged on opposite sides of the fan 30, and the gas outlet end of the gas distribution assembly 70 is connected to the gas inlet end of the combustion heat exchange assembly.

[0109] In this embodiment, the water heater 100 also includes a gas distribution assembly 70, which can be implemented using a distributor or a gas collection box. The gas distribution assembly 70 is located inside the casing 130, and its outlet is connected to the inlet of the combustion heat exchange assembly. Its main function is to evenly distribute pre-treated air and introduce it into the burner 20a, ensuring sufficient oxygen supply during combustion to support a stable and efficient combustion process. The gas distribution assembly 70 and the water inlet connector 60 are respectively arranged on opposite sides of the fan 30, which helps improve space utilization and makes the internal structure of the casing 130 more compact and reasonable, thus reducing equipment size and facilitating installation and maintenance.

[0110] like Figure 1 As shown, in one embodiment, the gas distribution assembly 70 is arranged close to the combustion heat exchange assembly, so that the gas can be delivered to the burner 20a in the shortest distance, reducing energy loss and potential safety risks.

[0111] As shown in the drawings, in an embodiment, the water heater 100 further comprises a smoke collecting hood, which is arranged inside the casing 130 and located at the side of the combustion heat exchange assembly away from the fan 30. The smoke collecting hood communicates the flue 104 with the smoke outlet 1302, and is arranged towards the main air inlet 1301. Figure 1 In the embodiment, the water heater 100 further comprises a smoke collecting hood, which is arranged inside the casing 130 and located at the side of the combustion heat exchange assembly away from the fan 30. The smoke collecting hood communicates the flue 104 with the smoke outlet 1302 on the casing 130, so as to realize orderly guiding and efficient discharging of high-temperature flue gas. The smoke collecting hood is arranged towards the main air inlet 1301. When the air enters the inside of the casing 130 from the main air inlet 1301, part of the airflow may directly act on the surface of the smoke collecting hood. Since the smoke collecting hood has a certain curved or inclined structure, the airflow will be reflected after impingement. However, this reflection is limited to the inside of the casing 130, that is, even if the wind blows to the smoke collecting hood and bounces back, the reflection path is completely inside the casing 130, and the noise will not be radiated or amplified outward.

[0112] It can be understood that in the prior art, the condensing gas water heater 100 usually realizes the fixed installation of the fan 30 by additionally welding a support on the metal frame 10. This design not only introduces a separate support part, increases the number of parts of the whole machine and the assembly complexity, but also must add a welding process in the production process. Welding not only prolongs the overall production process, improves the requirements for equipment precision and operator skills, but also easily causes quality defects such as welding deformation, uneven welding points, virtual welding or overwelding, thereby affecting the installation precision of the fan 30 and the sealing and reliability of the whole machine. Especially in the large-scale automatic production scene, the welding process is difficult to fully compatible with the flexible assembly line, resulting in limited production rhythm and difficult to improve efficiency. In addition, the frame 10 after welding often needs subsequent processing such as stress relief, polishing or repainting, further increasing the manufacturing cost and energy consumption. Therefore, the traditional welding support fixing mode has obvious bottlenecks in cost control, production efficiency and product consistency, and it is difficult to meet the needs of condensing gas water heater 100 products for efficient, green and intelligent manufacturing.

[0113] In order to improve the above problems, as shown in the drawings, in an embodiment, the water heater 100 further comprises a smoke collecting hood, which is arranged inside the casing 130 and located at the side of the combustion heat exchange assembly away from the fan 30. The smoke collecting hood communicates the flue 104 with the smoke outlet 1302, and is arranged towards the main air inlet 1301.

[0114] Figures 10 to 15 ​As shown, in an embodiment, the frame 10 is provided with a first positioning portion 80 and a second positioning portion 90 on opposite sides of the air inlet 201, and the volute 31 is provided with a first positioning matching portion 1101 and a second positioning matching portion 1201 on opposite sides of the air outlet 303. During installation, the frame 10 is placed horizontally on an assembly station, then the air outlet 303 of the fan 30 is aligned with the air inlet 201 at the bottom of the frame 10, and the first positioning matching portion 1101 is matched with the first positioning portion 80 and the second positioning matching portion 1201 is matched with the second positioning portion 90, so that the fan 30 can be quickly positioned and installed.

[0115] Among them, the first positioning portion 80, the second positioning portion 90, the first positioning matching portion 1101 and the second positioning matching portion 1201 can adopt various implementation forms, such as positioning buckles, positioning flanges or positioning protrusions, etc. Specifically, one of the first positioning portion 80 and the second positioning portion 90 can be configured as a first positioning buckle, and the other of the first positioning matching portion 1101 and the second positioning matching portion 1201 is configured as a second positioning buckle, which realizes quick connection by mutual buckling. This structure is convenient to assemble and can complete the positioning operation without tools. In addition, one of the first positioning portion 80 and the second positioning portion 90 can also be configured as a positioning flange, which is directly folded and formed by the plate material of the frame 10, forming a side structure with a certain height and a guide slope. Correspondingly, the other of the first positioning matching portion 1101 and the second positioning matching portion 1201 is configured as a matching positioning hole or groove, and during installation, the positioning flange is inserted into the positioning hole or embedded into the groove to realize the functions of guidance and positioning. Alternatively, one of the first positioning portion 80 and the second positioning portion 90 can be configured as a positioning protrusion, and the other is correspondingly configured as a positioning hole or groove, which realizes accurate positioning by inserting the positioning protrusion. The above various structural forms can be selected according to actual needs, and the specific form is not limited here.

[0116] Especially crucial is that, since the first positioning fitting part 1101 and the second positioning fitting part 1201 are respectively arranged on opposite sides of the air outlet 303, this arrangement can evenly distribute the weight of the fan 30 during installation, effectively balancing its gravity, preventing tilting, shaking or excessive unilateral stress due to gravity center deviation, thereby improving the stability of the installation process and the convenience of operation. Especially in automated assembly line operation, the operator or automated assembly equipment does not need to apply additional external force to right the fan 30, and can achieve single-handed operation or fully automatic precise assembly, improving assembly efficiency and operation safety. Moreover, after the first positioning part 80 and the first positioning fitting part 1101, and the second positioning part 90 and the second positioning fitting part 1201 respectively complete positioning fitting, the fan 30 has been pre-positioned and installed on the frame 10 and will not be loose or displaced. On this basis, if further locking is required using screws, buckles or other fasteners, the operator does not need to hold the fan 30 by hand and can directly perform the locking operation, avoiding the inefficient operation mode of "one hand holding the machine and the other hand screwing the screw" in traditional installation, optimizing the assembly process. At the same time, when the fan 30 needs to be repaired or replaced later, it can be easily disassembled along the original positioning direction after the fasteners are released, avoiding the difficulty of disassembly caused by the obstruction of the welded bracket or the residue of the welding points, improving the maintenance convenience. In addition, this scheme does not require additional brackets or welding, which can reduce the number of parts, avoid problems such as deformation and uneven strength caused by welding, simplify the production process, and reduce material and labor costs.

[0117] As shown in Figure 10 and Figure 11 In an embodiment, the first positioning part 80 is configured as a first positioning flange arranged on one side edge of the frame 10 and extending towards the combustion chamber 102, the volute 31 is provided with a first positioning protrusion 110 extending towards the combustion chamber 102, the first positioning fitting part 1101 is a positioning groove arranged on the first positioning protrusion 110, and the first positioning flange is accommodated in the positioning groove.

[0118] In this embodiment, the first positioning flange is directly formed by stamping or bending the metal plate of the frame 10, without the need for additional independent parts or secondary processing procedures such as welding or riveting, which not only reduces material costs and assembly complexity, but also avoids problems such as deformation and stress concentration caused by welding. The first positioning flange extends from one side edge of the frame 10 towards the inside of the combustion chamber 102, and its extension direction is basically consistent with the flue gas flow path, which will not form a prominent obstacle structure in the combustion chamber 102, and is conducive to maintaining the smooth flow of air in the combustion chamber 102, reducing vortex generation and local pressure loss, thereby ensuring the stability of the combustion process and the combustion efficiency.

[0119] The first positioning protrusion 110 is arranged on the side of the volute 31 corresponding to the air outlet 303 and extends in the direction towards the combustion chamber 102, and a positioning groove is arranged on the first positioning protrusion 110. The positioning groove is arranged on the side of the first positioning protrusion 110 away from the air outlet 303, and the groove opening 11001 is arranged in a direction away from the edge of the air outlet 303. This structure design enables the operator or the automatic assembly equipment to push the fan 30 into the frame body 10 along the first direction when the frame body 10 is placed horizontally on the assembly station during the installation of the fan 30. During this process, the first positioning flange slides into and is finally completely embedded in the groove along the groove opening 11001 of the positioning groove, achieving rapid guidance and accurate positioning.

[0120] More importantly, since part of the groove opening 11001 of the positioning groove is directed towards the inside of the combustion chamber 102, when the fan 30 is completely installed in place, the first positioning flange is completely covered inside the positioning groove, forming an embedded type limiting structure. This structure can effectively prevent the fan 30 from loosening or falling off due to vibration, impact or external force during handling, turning over or subsequent assembly, ensuring the stability and reliability of the pre-installation state. On this basis, if further screwing is required to finally fix the fan 30, the operator or the automatic assembly equipment does not need to manually support the fan 30, nor does it need to use additional clamps for positioning and clamping, and the locking operation can be directly completed. This not only can simplify the assembly steps and reduce manual intervention, but also is conducive to improving the automation level and overall operation efficiency of the production line.

[0121] As shown in FIGS. 1, 2 and 3, in an embodiment, the first positioning flange is configured as a multi-layered flange structure. Figure 10 Figure 11 As shown in FIGS. 1, 2 and 3, in an embodiment, the first positioning flange is configured as a multi-layered flange structure.

[0122] In this embodiment, the first positioning flange includes a first flange portion 81 and a second flange portion 82 arranged in a first direction in a stacked manner. According to actual needs, the number of the first flange portion 81 and the second flange portion 82 can be set to one, two or even more, thereby forming a double-layered flange structure, a triple-layered flange structure or even a flange structure with more layers. Taking an example in which the first flange portion 81 and the second flange portion 82 are each provided with one, the first positioning flange is configured as a double-layered flange structure. By adopting this double-layered flange structure, not only can the overall rigidity and bending resistance of the first positioning flange be increased, avoiding the difficulty in clamping caused by insufficient strength or surface burrs of a single-layer structure, but also a wider contact area can be provided, so that the first positioning flange and the positioning groove have better adhesion, further improving the stability and reliability of the assembly.

[0123] ​It can be understood that for a single-layer structure, burrs or sharp cutting edges are prone to occur at the edges, which not only poses a threat to the safety of the operators, but also can scratch or wear the positioning groove. The multi-layered edge structure optimizes the stamping or bending process, making the edges smoother and reducing the possibility of burr generation, while also reducing the risk of damage to the inner surface of the positioning groove. Therefore, the use of a multi-layered edge structure not only enhances the durability and safety of the product, but also improves the smoothness and accuracy during assembly, reducing the failure rate and rework cost caused by improper edge treatment.

[0124] As shown in Figure 10 and Figure 11 In an embodiment, the positioning groove has opposite first and second groove walls 11011 and 11012, and opposite groove bottom wall 11013 and groove opening 11001. The first groove wall 11011 has a guide surface 110111 extending from the groove opening 11001 towards the groove bottom wall 11013 and inclined towards the second groove wall 11012.

[0125] In this embodiment, the positioning groove has first and second groove walls 11011 and 11012, which are arranged opposite to each other in the up-down direction, which is the up-down direction after the water heater 100 is installed. The positioning groove also has a groove bottom wall 11013 and a groove opening 11001, which are arranged opposite to each other in the front-back direction, which is the aforementioned first direction, which is actually the front-back direction after the water heater 100 is installed. The guide surface 110111 on the first groove wall 11011 extends from the edge of the groove opening 11001 towards the groove bottom wall 11013, and gradually inclines towards the second groove wall 11012, so that the opening width of the positioning groove at the entrance is slightly larger than the width near the groove bottom inside, and the overall presents a "bell mouth" shape or wedge-shaped narrowing structure. When the fan 30 is installed from top to bottom, the first positioning flange first contacts the groove opening 11001 of the positioning groove. Due to the presence of the guide surface 110111, even if there is a slight positional deviation between the first positioning flange and the positioning groove, the guide surface 110111 can guide the first positioning flange to smoothly enter the positioning groove.

[0126] More importantly, the design of the guide surface 110111 inclined to the second groove wall 11012 makes the positioning groove form a "narrow inside and wide outside" locking effect after the assembly is completed. When the first positioning flange is completely inserted into the positioning groove and reaches the groove bottom wall 11013, its two sides are clamped by the first groove wall 11011 and the second groove wall 11012, and especially the clamping area formed between the guide surface 110111 and the second groove wall 11012 will generate a constraint force on the first positioning flange. This constraint force not only helps to maintain the stable position of the first positioning flange in the positioning groove, but also enhances the overall anti-vibration performance of the fan 30. Therefore, even in the case of carrying, vibration or external force impact, the positioning flange is not easy to come out of the positioning groove, ensuring the stability and reliability of the installation of the fan 30.

[0127] As shown in FIGS. 1, 2 and 3, in an embodiment, the first positioning portion 80 includes a first positioning flange 81 provided on the one side edge of the frame body 10 and extending away from the combustion chamber 102, and a first positioning protrusion 110 provided on the first positioning flange 81. The first positioning protrusion 110 is provided on the first positioning flange 81 and extends towards the combustion chamber 102. The first positioning protrusion 110 has a first positioning fitting portion 1101 in the form of a positioning hole. Figure 10 Figure 12 As shown in FIGS. 1, 2 and 3, in an embodiment, the first positioning portion 80 includes a first positioning flange 81 provided on the one side edge of the frame body 10 and extending away from the combustion chamber 102, and a first positioning protrusion 110 provided on the first positioning flange 81. The first positioning protrusion 110 is provided on the first positioning flange 81 and extends towards the combustion chamber 102. The first positioning protrusion 110 has a first positioning fitting portion 1101 in the form of a positioning hole.

[0128] In the embodiment, the second positioning portion 90 includes the second positioning flange 91 and the catch 92. The second positioning flange 91 is directly formed by stamping or bending the metal plate material of the frame body 10, without the need for additional independent parts or secondary processing procedures such as welding or riveting. This not only reduces material costs and assembly complexity, but also avoids problems such as deformation and stress concentration caused by welding. The second positioning flange 91 extends from the other side edge of the frame body 10 corresponding to the air inlet 201 towards the inside of the combustion chamber 102, and its extension direction is basically consistent with the flue gas flow path, so it does not form a prominent obstacle structure in the combustion chamber 102, which is conducive to maintaining the smooth flow of the airflow in the combustion chamber 102, reducing vortex generation and local pressure loss, and thus ensuring the stability and combustion efficiency of the combustion process. The second positioning flange 91 also forms the air inlet 201 of the frame body 10 together with the first positioning flange. The catch 92 is provided on the side of the second positioning flange 91 away from the air inlet 201.

[0129] ​The second positioning protrusion 120 is arranged at the other side of the volute 31 corresponding to the air outlet 303 and extends towards the direction of the combustion chamber 102. The second positioning protrusion 120 is arranged opposite to the first positioning protrusion 110 along the first direction and is provided with a positioning hole, and the hole channel of the positioning hole extends along the first direction. This structure design allows the operator or automatic assembly equipment to push the fan 30 into the frame 10 along the first direction when the fan 30 is installed, with the frame 10 placed horizontally on the assembly station. During this process, the clamping tongue 92 first contacts the hole opening of the positioning hole, and as the fan 30 continues to move downward, the clamping tongue 92 smoothly slides along the hole channel until it is completely inserted into the positioning hole, achieving rapid guidance and accurate positioning.

[0130] More importantly, after the fan 30 is completely installed in place, the clamping tongue 92 is firmly inserted into the positioning hole, which not only ensures that the fan 30 is not easily loosened or detached in the case of handling, vibration or external force impact, but also provides additional stability to ensure the accuracy of the position of the fan 30.

[0131] As shown in FIGS. 1, 2 and 3, in an embodiment, the positioning hole extends through both sides of the volute 31 along the first direction, and the second positioning flange 91 includes a third flange portion 911 and a fourth flange portion 912 arranged in layers along the first direction, the third flange portion 911 being located at the side of the fourth flange portion 912 close to the positioning hole, and the third flange portion 911 being provided with a flange hole 9101, the flange of the flange hole 9101 being bent away from the fourth flange portion 912 to form the clamping tongue 92. Figure 10 Figure 12 As shown in FIGS. 1, 2 and 3, in an embodiment, the positioning hole extends through both sides of the volute 31 along the first direction, and the second positioning flange 91 includes a third flange portion 911 and a fourth flange portion 912 arranged in layers along the first direction, the third flange portion 911 being located at the side of the fourth flange portion 912 close to the positioning hole, and the third flange portion 911 being provided with a flange hole 9101, the flange of the flange hole 9101 being bent away from the fourth flange portion 912 to form the clamping tongue 92.

[0132] In this embodiment, by bending the edge of the flange hole 9101 to form the clamping tongue 92, the ductility and strength of the metal plate material of the frame 10 can be fully utilized, and the clamping tongue 92 can be formed only by simple stamping or bending process without the need for additional connecting parts or complex processing steps. The bent part formed by the clamping tongue 92 not only has sufficient elastic deformation capability, so that the clamping tongue 92 can better adapt to the slight deviation in the assembly process and ensure the close fit with the positioning hole, but also can enhance the structural strength of the clamping tongue 92. Since the clamping tongue 92 is directly bent from the material of the third flange portion 911, the connection strength between the clamping tongue 92 and the third flange portion 911 can be further enhanced, avoiding the loosening or detachment problem that may be caused by using independent parts.

[0133] ​It is worth noting that the second positioning flange 91 comprises a third flange part 911 and a fourth flange part 912 stacked in the first direction. According to actual needs, the number of the third flange part 911 and the fourth flange part 912 can be set to one, two or even more according to specific application scenarios, thereby forming a double-layered edge structure, a three-layered edge structure or even a more layered edge structure. Taking an example that the third flange part 911 and the fourth flange part 912 are each provided with one, the second positioning flange 91 is configured as a double-layered edge structure. This structure can increase the overall rigidity and bending resistance of the second positioning flange 91, and is especially suitable for application environments that need to withstand large external forces or vibrations.

[0134] More importantly, the traditional single-layer flange structure is prone to loose sealing after the flange hole 9101 is opened, especially in high airflow speed or high pressure environments, which may cause gas leakage. For example, in the actual application of the condensing gas water heater 100, a certain negative pressure state needs to be maintained in the combustion chamber 102 to ensure sufficient combustion and efficient heat exchange. If there is a leakage point, it will cause unstable combustion and affect the overall performance of the water heater 100. In the present application, the double-layer or multi-layer edge structure of the third flange part 911 and the fourth flange part 912 can form an effective barrier to prevent air from leaking from the flange hole 9101, ensuring the combustion efficiency of the combustion chamber 102.

[0135] As shown in FIGS. 1, 2 and 3, the clamping tongue 92 comprises a first guide segment 921 and a second guide segment 922 connected to each other in the first direction. The first guide segment 921 is connected to the second positioning flange 91 and extends in the first direction, and the second guide segment 922 is inclined away from the frame body 10 relative to the first guide segment 921. Figure 10 Figure 12 As shown in FIGS. 1, 2 and 3, the clamping tongue 92 comprises a first guide segment 921 and a second guide segment 922 connected to each other in the first direction. The first guide segment 921 is connected to the second positioning flange 91 and extends in the first direction, and the second guide segment 922 is inclined away from the frame body 10 relative to the first guide segment 921.

[0136] ​In this embodiment, the latch 92 includes a first guide segment 921 and a second guide segment 922, which are connected to each other along a first direction. The first guide segment 921 serves as the base segment of the latch 92, directly connected to the second positioning flange 91 and extending along the first direction. This ensures that the latch 92 can be securely fixed to the second positioning flange 91, providing sufficient structural strength and stability to prevent deformation or breakage during installation or use. The second guide segment 922 can be considered as the guide segment of the latch 92, which is inclined relative to the first guide segment 921 towards the side away from the frame 10. When the operator or automated assembly equipment pushes the fan 30 into the frame 10 from top to bottom, the inclined surface of the second guide segment 922 first contacts the edge of the positioning hole. Due to the inclined design, even with slight positional deviations, the latch 92 can be guided smoothly into the positioning hole, thereby reducing the alignment accuracy requirements and simplifying the installation process. In addition, the inclined setting of the second guide section 922 can provide additional elastic deformation space to a certain extent, so that the latch 92 can fit more tightly against the inner wall of the positioning hole, enhance the firmness of the snap-fit, and avoid loosening or falling off due to vibration or external force.

[0137] like Figures 13 to 15 As shown, in one embodiment, the first positioning part 80 is provided with a first assembly part, the first positioning mating part 1101 is provided with a first mating part, the first assembly part and the first mating part are connected by fasteners to fix the fan 30 to the frame 10; and / or, the second positioning part 90 is provided with a second assembly part 9102, the second positioning mating part 1201 is provided with a second mating part 1202, the second assembly part 9102 and the second mating part 1202 are connected by fasteners to fix the fan 30 to the frame 10.

[0138] In the embodiment, the first assembly part, the first matching part, the second assembly part 9102 and the second matching part 1202 can be configured as fixing holes for connecting fasteners. The fixing holes can be circular holes, square holes, oval holes or other structures suitable for the shape of the fasteners. The fasteners can be selected from screws, self-tapping screws, rivets, quick-mount bolts or elastic catches. During the installation of the fan 30, the first positioning part 80 and the first positioning matching part 1101, and the second positioning part 90 and the second positioning matching part 1201 are first positioned and matched to achieve the quick pre-positioning of the fan 30 on the frame 10. The pre-positioning process ensures that the fan outlet 303 is accurately aligned with the air inlet 201 of the frame 10, and the anti-disengagement limiting is achieved through the cooperation of the flange and the slot hole structure. On this basis, the fasteners are simultaneously inserted into the first assembly part and the first matching part, and the second assembly part 9102 and the second matching part 1202 to complete the final fixation of the fan 30. This "pre-positioning and then locking" assembly method can avoid the problems of screw misalignment, difficulty in tapping or loose connection caused by position deviation in traditional installation.

[0139] In particular, since the fan 30 is in a stable pre-installed state before locking, the operator or automatic assembly equipment does not need to apply additional external force to support the fan 30, and can directly perform the fastener locking operation. This not only improves the assembly efficiency and reduces the labor intensity, but also is more conducive to ensuring the consistency of the locking torque and improving the stability of the product assembly quality. For the automatic production line, this design can also reduce the dependence on clamping equipment and improve the flexibility and beat efficiency of the production line.

[0140] As shown in FIG. 10, Figures 13 to 16 In an embodiment, the second assembly part 9102 is configured as a first fixing hole provided on the second positioning part 90, and the second matching part 1202 is a second fixing hole provided on the second positioning matching part 1201; the frame 10 has a back plate 112 and a face plate 13 arranged opposite along a first direction, the first positioning part 80 is arranged on one side of the fan outlet 303 close to the back plate 112, the second positioning part 90 is arranged on one side of the fan outlet 303 close to the face plate 13, the positions of the first fixing hole and the second fixing hole are correspondingly arranged and extend along the first direction, and the fastener is inserted into the first fixing hole and the second fixing hole along the first direction.

[0141] In the embodiment, the installation of the fan 30 adopts a top-down vertical assembly method, which is highly consistent with the natural operation posture of the operator and meets the ergonomic design principle. When the operator performs the assembly operation, he or she can maintain a comfortable posture of standing upright or slightly leaning forward, and push the fan 30 along the first direction to the air inlet 201 position at the bottom of the frame body 10, thereby reducing the fatigue caused by long-time operation and improving the convenience and safety of operation. For the automatic assembly line, the automatic assembly equipment is also easier to realize precise alignment and stable pressing action, which is beneficial to improve the assembly rhythm and consistency.

[0142] More importantly, in the process of installing the fan 30 along the first direction to the position, the second positioning protrusion 120 on the fan 30 is synchronized with the clamping tongue 92 of the second positioning part 90. As the fan 30 gradually moves downward, the clamping tongue 92 slides along the positioning hole and is firmly inserted into the hole after being completely positioned, forming a reliable anti-dropping clamping structure. This clamping action can effectively prevent the fan 30 from loosening, deviating or even falling due to its own weight, handling vibration or subsequent process disturbance without relying on screws or other external clamps, ensuring that the fan 30 always maintains an accurate installation position before locking.

[0143] On this basis, when the fan 30 is pre-positioned by the first positioning flange and the positioning groove, and the clamping tongue 92 and the positioning hole, the fastener can be vertically arranged in the corresponding first fixing hole and the second fixing hole along the first direction, i.e., from the back plate 112 to the panel 13 or from the panel 13 to the back plate 112, to realize the final rigid connection. Since the fan 30 has been pre-positioned at this time, the operator of the automatic assembly equipment can directly perform the locking operation of the fastener, greatly simplifying the traditional inefficient mode of "one hand holding the machine and the other hand screwing the screw". This composite assembly process of "first positioning from top to bottom and then locking in the first direction" can not only significantly improve the assembly efficiency and operation safety, but also avoid structural deformation or misalignment caused by continuous force in a single direction. At the same time, it also provides a disassembly path for later maintenance, which only needs to disassemble the horizontal fastener and then vertically take out the fan 30, and the whole process is smooth and unobstructed, improving the maintainability of the water heater 100.

[0144] The above-described only for the exemplary embodiments of the present application, not therefore limit the patent scope of the present application, any equivalent structure transformation made in the technical concept of the present application, using the contents of the present application specification and drawings, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A water heater, characterized in that, include: The frame has mounting ports; A burner is disposed within the frame, and the burner has an air inlet communicating with the mounting port; A fan is disposed in the frame. The fan includes a volute, the volute having a wind chamber and an air outlet communicating with the wind chamber. The air outlet is connected to and communicates with the mounting port. The volute has a guide surface on one edge near the air outlet. The guide surface is inclined relative to the plane where the mounting port is located to guide the airflow from the air outlet toward the side closer to the air inlet. The volute has a volute tongue and a first shell sidewall opposite to the volute tongue. The inner wall of the first shell sidewall has the guide surface.

2. The water heater as described in claim 1, characterized in that, The air guide surface is set at an angle to the plane where the mounting port is located, and the angle is not less than 65 degrees and not greater than 75 degrees.

3. The water heater as described in claim 1, characterized in that, The frame includes a back panel and a front panel, and a base plate connecting the back panel and the front panel. The air inlet is positioned facing the front panel, and the mounting port is located on the base plate.

4. The water heater as described in claim 3, characterized in that, The back plate and the front panel are arranged opposite each other along a first direction. The volute is also provided with an air inlet communicating with the air cavity. The axis of the air inlet extends along a second direction. The side of the volute away from the back plate does not exceed the plane where the front panel is located. The first direction and the second direction intersect.

5. The water heater as described in claim 4, characterized in that, The side of the volute facing away from the back plate is flush with the plane of the panel.

6. The water heater as described in claim 3, characterized in that, The first shell sidewall is inclined from the plane where the mounting port is located toward the side closer to the back plate.

7. The water heater as described in any one of claims 1 to 6, characterized in that, The frame includes a first frame, a second frame, and a panel. The second frame is connected to the first frame to form a combustion chamber, and a disassembly port is connected to the combustion chamber. The combustion chamber is connected to the air intake, and the panel is placed over the disassembly port.

8. The water heater as described in claim 7, characterized in that, The first frame includes a top plate and a back plate that are bent and connected. The second frame includes a bottom plate, and a first side plate and a second side plate disposed on opposite sides of the bottom plate. The bottom plate is disposed opposite to the top plate, and the disassembly port is disposed opposite to the back plate.

9. The water heater as described in claim 8, characterized in that, The first frame is riveted to the second frame.

10. The water heater as described in claim 9, characterized in that, The back panel has a limiting rib on at least one side edge, and the limiting rib cooperates with the second frame to limit the installation of the second frame on the back panel.

11. The water heater as described in claim 10, characterized in that, The back plate has a first side edge and a second side edge, and the first side edge is provided with a first limiting rib and a second limiting rib at intervals. The first limiting rib and the second limiting rib respectively cooperate with the first side plate to limit the installation of the first side plate on the back plate. The second side edge is provided with a third limiting rib and a fourth limiting rib at intervals. The third limiting rib and the fourth limiting rib respectively cooperate with the second side plate to limit the installation of the second side plate on the back plate.

12. The water heater as described in claim 9, characterized in that, The back panel is provided with a limiting part, which cooperates with the first side panel and / or the second side panel to limit the first side panel and / or the second side panel to the back panel.

13. The water heater as described in claim 12, characterized in that, The back panel has a first opening, and the limiting part includes a first folded edge provided on the back panel. The first folded edge is bent from the edge of the first opening toward the direction close to the top panel, and the first side panel abuts against the side of the first folded edge away from the top panel. And / or, the back panel is provided with a second opening, the limiting portion includes a second folded edge provided on the back panel, the second folded edge is bent from the edge of the second opening toward the direction close to the top panel, and the second side panel abuts against the side of the second folded edge away from the top panel.

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