CN218864170U - Combustor and gas water heater - Google Patents

Abstract

The application belongs to the technical field of water heaters, and particularly relates to a combustor and a gas water heater. The problem that the combustor shell temperature of current combustor is too high is aimed at solving to this application. According to the gas water heater, the combustion frame of the combustor is fixed inside the combustor shell, and an air inlet cavity is formed between the combustion frame and the bottom end of the combustor shell; have the clearance between combustor inner shell and the combustor shell, be equipped with the butt structure on at least one in combustor inner shell and the combustor shell to keep the clearance and form the cooling duct between messenger's combustor inner shell and the combustor shell, cooling duct and air inlet chamber intercommunication, so the air can get into the cooling duct via the air inlet chamber, cools down combustor inner shell and combustor shell, avoids combustor inner shell and combustor shell's high temperature and damages other parts. The top end of the combustor inner shell is inserted into the top end of the combustor outer shell, so that the combustor inner shell and the combustor outer shell are simple and reliable to assemble and high in efficiency.

Description

Combustor and gas water heater

Technical Field

The application belongs to the technical field of water heaters, and particularly relates to a combustor and a gas water heater.

Background

The gas water heater is also called as a gas water heater, and refers to a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a combustion heating mode to achieve the purpose of preparing hot water.

In the combustion process of the burner, a large amount of heat is generated, and part of the heat is transferred to the burner shell, so that the temperature of the burner shell is too high, and devices outside the burner shell are easily damaged.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problem among the prior art, be promptly for solving the technical problem that current combustor shell temperature is too high, this application provides a combustor and gas heater.

The burner includes: the burner comprises a burner outer shell, a burning frame and a burner inner shell positioned inside the burner outer shell; the combustion frame and the combustor inner shell form a combustion chamber; the combustion rack is fixed in the combustor shell, and a plurality of fire rows are arranged on the combustion rack; an air inlet cavity is formed between the combustion rack and the bottom end of the combustor shell at an interval; a gap is formed between the combustor inner shell and the combustor outer shell, and at least one of the combustor inner shell and the combustor outer shell is provided with a butting structure so as to form a cooling air channel between the combustor inner shell and the combustor outer shell, wherein the cooling air channel is communicated with the air inlet cavity; the top end of the combustor inner shell is connected with the top end of the combustor outer shell in an inserting mode.

In an alternative aspect of the above burner, the burner inner casing includes: the wall comprises a front wall plate, a rear wall plate, a first side wall plate and a second side wall plate, wherein two sides of the front wall plate are respectively abutted against the first side wall plate and the second side wall plate, and two sides of the rear wall plate are respectively abutted against the first side wall plate and the second side wall plate; a gap is formed between the front wall plate and the combustor shell to form a front air channel, a gap is formed between the rear wall plate and the combustor shell to form a rear air channel, a gap is formed between the first side wall plate and the combustor shell to form a first air channel, and a gap is formed between the second side wall plate and the combustor shell to form a second air channel; the front air duct, the rear air duct, the first air duct and the second air duct are all communicated with the air inlet cavity; the front air duct, the rear air duct, the first air duct, and the second air duct form the cooling air duct.

In an optional technical scheme of the burner, the top end of the rear wall plate is bent and extended away from the front wall plate to form a rear folded edge, and part of the rear folded edge is bent and extended towards the combustion frame to form a rear insert; the top end of the first side wall plate is bent and extended away from the second side wall plate to form a first folding edge, and part of the first folding edge is bent and extended towards the combustion frame to form a first inserting piece; the top end of the second side wall plate is bent and extended away from the first side wall plate to form a second folded edge, and part of the second folded edge is bent and extended towards the combustion rack to form a second inserting piece; a rear fixing edge, a first fixing edge and a second fixing edge are formed at the top end of the combustor shell, the rear fixing edge is opposite to the rear folded edge, and a rear insertion opening matched with the rear insertion piece is formed in the rear fixing edge; the first fixing edge is opposite to the first folded edge, and a first inserting opening matched with the first inserting piece is formed in the first fixing edge; the second fixing edge is opposite to the second folding edge, and a second inserting opening matched with the second inserting piece is formed in the second fixing edge.

In an optional technical scheme of the burner, two ends of the top of the front wall plate extend towards the burner shell respectively to form fixed clamping edges; the top end of the combustor shell is used for installing a heat exchange device, and the fixing clamp edge is clamped between the combustor shell and the heat exchange device.

In an optional technical scheme of the burner, a mounting interval for mounting the heat exchange device is formed on the front side and the rear side of the burner shell; the front wall plate extends into the mounting interval, and a gap is formed between the top end of the front wall plate and the combustor shell to form an air outlet gap; the top of back wallboard be provided with the exhaust vent of back wind channel intercommunication, the exhaust vent with the air-out clearance all is located heat transfer device's heat transfer pipeline's top.

In an optional technical scheme of the burner, a part of the first side edge and a part of the second side edge of the rear wall plate bend and extend towards the front wall plate to form a first limiting plate, a part of the rear end of the first side wall plate and a part of the rear end of the second side wall plate respectively protrude towards the combustion chamber to form a first limiting convex hull, and the first limiting convex hull is abutted against the first limiting plate; the partial first side edge and the partial second side edge of preceding wallboard move towards back wallboard bending and extending forms the second limiting plate, the part of first side wallboard front end and the part of second side wallboard front end moves towards respectively the protruding spacing convex closure of second that forms in the combustion chamber, the spacing convex closure of second with the butt of second limiting plate.

In an optional technical scheme of the burner, a part of the first side edge and a part of the second side edge of the front wall plate bend and extend towards the burner shell to form a front flanging; part of the first side edge and part of the second side edge of the rear wall plate bend and extend towards the burner shell to form rear flanges; part of the front side edge and part of the rear side edge of the first side wall plate bend and extend towards the burner shell to form a first flanging; and part of the front side edge and part of the rear side edge of the second side wall plate bend and extend towards the burner shell to form a second flanging.

In an optional technical solution of the above burner, a first abutting convex hull protruding toward the burner housing is provided on the front wall plate, and the first abutting convex hull can abut against the burner housing; a second abutting convex hull protruding towards the combustor shell is arranged on the rear wall plate and can abut against the combustor shell; the abutment structure comprises the first abutment lobe and the second abutment lobe.

In an optional technical solution of the above burner, one end of the front wall plate close to the combustion rack is bent and extended toward the burner housing to form a first connecting edge, the first connecting edge is bent and extended toward the combustion rack to form a first abutting edge, and the first abutting edge abuts against the burner housing; a plurality of first through openings are arranged at intervals along the length direction of the first connecting edge, and the first through openings are communicated with the front air duct and the air inlet cavity; one end, close to the combustion frame, of the rear wall plate bends and extends towards the front wall plate to form a second connecting edge, the second connecting edge bends and extends towards the combustion frame to form a second abutting edge, and the second abutting edge abuts against the combustion frame; and a plurality of second through openings are arranged at intervals along the length direction of the second connecting edge and communicated with the rear air duct and the air inlet cavity.

The gas water heater includes: heat transfer device, fan and foretell combustor, heat transfer device is located the top of combustor, the fan is installed the bottom of combustor, the fan with the air inlet chamber intercommunication of combustor

As can be understood by those skilled in the art, the burner of the gas water heater comprises a burner outer shell, a burning frame and a burner inner shell, wherein the burning frame and the burner inner shell form a burning cavity; have the clearance between combustor inner shell and the combustor shell, be equipped with the butt structure on at least one in combustor inner shell and the combustor shell to make keep the clearance and form the cooling duct between combustor inner shell and the combustor shell, cooling duct and air inlet chamber intercommunication, so air can get into cooling duct through the air inlet chamber, lower the temperature to combustor inner shell and combustor shell, avoid the casing high temperature of combustor to damage other parts. The top end of the combustor inner shell is inserted into the top end of the combustor outer shell, so that the combustor inner shell and the combustor outer shell are simple and reliable to assemble and high in efficiency.

Drawings

Alternative embodiments of the burner and gas water heater of the embodiments of the present application are described below with reference to the accompanying drawings. The attached drawings are as follows:

FIG. 1 is a schematic structural diagram of a gas water heater according to an embodiment of the present application;

FIG. 2 is an exploded view of a burner and heat exchange unit according to an embodiment of the present application;

FIG. 3 is a schematic structural view of an inner combustor casing and a combustion rack according to an embodiment of the present disclosure;

FIG. 4 is a front view of a combustor outer casing and a combustor inner casing according to an embodiment of the present application;

FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4;

FIG. 6 is an enlarged schematic view of region P of FIG. 5;

FIG. 7 is an enlarged schematic view of region Q of FIG. 5;

FIG. 8 is a cross-sectional view of an outer combustor casing and an inner combustor casing according to an embodiment of the present application;

FIG. 9 is a schematic structural view of a rear wall plate of a combustor inner casing according to an embodiment of the present application;

FIG. 10 is a schematic view of a first sidewall plate of a combustor inner casing according to an embodiment of the present application.

In the drawings: 100: a burner housing; 110: a front side plate; 120: a rear side plate; 121: a rear fixed edge; 122: a rear socket; 130: a U-shaped plate; 131: a first side plate; 1311: a first fixed edge; 1312: a first socket; 132: a second side plate; 1321: a second fixed edge; 1322: a second socket; 133: a base plate; 1331: an air inlet; 140: a gasket; 200: a combustor inner casing; 201: a combustion chamber; 202: mounting intervals; 205: an air inlet cavity; 210: a front wall panel; 2100: a front air duct; 211: fixing the clamping edge; 212: an air outlet gap; 213: a second limiting plate; 214: front flanging; 215: a first abutting convex hull; 216: a first connecting edge; 2161: a first through opening; 217: a first abutting edge; 220: a rear wall panel; 2200: a rear air duct; 221: folding the edges; 222: a rear plug-in sheet; 223: an air outlet; 224: a first limit plate; 225: carrying out back flanging; 226: a second abutting convex hull; 227: a second connecting edge; 228: a second abutting edge; 230: a first side wall panel; 2300: a first air duct; 231: a first folded edge; 232: a first tab; 233: a first limit convex hull; 234: a first flanging; 235: a third abutting convex hull; 240: a second sidewall plate; 2400: a second air duct; 241: a second folded edge; 242: a second insert; 243: a second limiting convex hull; 244: second flanging; 245: a fourth abutting convex hull; 250: a combustion rack; 300: fire grate; 400: a heat exchange device; 500: an outer housing; 510: a first half shell; 520: a second half shell; 600: a fan.

Detailed Description

First, it should be understood by those skilled in the art that these embodiments are merely for explaining technical principles of the embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application. And can be adjusted as needed by those skilled in the art to suit particular applications.

Furthermore, it should be noted that in the description of the embodiments of the present application, the terms of direction or positional relationship indicated by the terms "inside" and "outside" and the like are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or member must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the embodiments of the present application.

Furthermore, it should be noted that, in the description of the embodiments of the present application, unless explicitly stated or limited otherwise, the terms "connected" and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other. The specific meanings of the above terms in the examples of the present application can be understood by those skilled in the art as appropriate.

The gas water heater is also called as a gas water heater, and refers to a gas appliance which takes gas as fuel and transfers heat to cold water flowing through a heat exchanger in a combustion heating mode to achieve the purpose of preparing hot water. In the combustion process of the burner, a large amount of heat is generated, and part of the heat is transferred to the burner shell, so that the temperature of the burner shell is too high, and devices outside the burner shell are easily damaged.

In view of this, in the embodiment of the present application, an air duct is formed between the burner outer shell and the burner inner shell at an interval, and air can be discharged upwards through the air duct to perform a cooling function; an abutting structure is arranged between the combustor outer shell and the combustor inner shell so as to keep the air duct smooth; the top of combustor inner shell is pegged graft in the top of combustor shell, and the connected mode is simple, stable, and the packaging efficiency is high.

The technical scheme of the burner and the gas water heater according to the embodiment of the application is described below with reference to the accompanying drawings.

First, it should be noted that, in the embodiments of the present application, the directional word "front" refers to a side of the gas water heater facing a user, and the directional word "bottom" refers to a side facing the ground. The "front-back direction" and the "longitudinal direction" correspond to the Y axis in the drawings, the "left-right direction" and the "lateral direction" correspond to the X axis in the drawings, and the vertical direction corresponds to the Z axis in the drawings.

Fig. 1 is a schematic structural diagram of a gas water heater according to an embodiment of the present application, and fig. 2 is an exploded view of a burner and a heat exchange device according to the embodiment of the present application.

With reference to fig. 1 and 2, an embodiment of the present application provides a gas water heater, which includes: the heat exchange device 400 is positioned at the top of the combustor, the fan 600 is installed at the bottom end of the combustor, and the fan 600 is communicated with an air inlet cavity of the combustor, so that air sucked into the air inlet cavity by the fan 600 is partially fed into the combustor for gas combustion, and the other part of air is fed into an air duct of the combustor for cooling; high-temperature flue gas generated by combustion of the burner enters the heat exchange device 400, so that the heat exchange device 400 performs heat exchange to achieve the purpose of heating water.

The gas water heater of the embodiment of the application further comprises an outer shell 500, the combustor shell 100, the heat exchange device 400 and the fan 600 are all installed in the outer shell 500, and the outer shell 500 protects the internal structure of the gas water heater and provides an installation space for the internal structure of the gas water heater. Of course, an air inlet is provided at the rear portion of the outer casing 500, and the external air enters the inside of the outer casing 500 through the air inlet and enters the inside of the burner housing 100 through the fan 600 under the action of the fan 600.

Illustratively, the outer housing 500 may be a rectangular housing, and the outer housing 500 includes a first housing half 510 and a second housing half 520, wherein the first housing half 510 is a U-shaped plate housing, and the first housing half 510 includes a front side plate portion, a left side plate portion and a right side plate portion, and the left side plate portion and the right side plate portion are disposed at opposite intervals on the left and right sides of the front side plate portion. The first half-shell 510 is a unitary piece that facilitates assembly of the outer shell 500. Half shell 520 includes fixed connection's rear side board portion, top end board portion and bottom board portion, and top end board portion and bottom board portion are fixed respectively at the top and the bottom of rear side board portion, top end board portion and the top fixed connection of first half shell 510, bottom board portion and the bottom fixed connection of first half shell 510, the left and right sides of rear side board portion respectively with left side board portion and right side board portion fixed connection. The plate portions of the outer case 500 may be connected by screws, rivets, or the like, but the embodiment of the present invention is not limited thereto.

FIG. 3 is a schematic structural view of a combustor inner casing and a combustion rack according to an embodiment of the present application;

FIG. 4 is a front view of a combustor outer casing and a combustor inner casing according to an embodiment of the present application; FIG. 5 isbase:Sub>A sectional view A-A of FIG. 4; FIG. 6 is an enlarged schematic view of region P of FIG. 5; FIG. 7 is an enlarged schematic view of the region Q of FIG. 5; FIG. 8 is a cross-sectional view of an outer shell and an inner shell of a combustor according to an embodiment of the present application; FIG. 9 is a schematic structural view of a rear wall plate of a combustor inner casing according to an embodiment of the present application; FIG. 10 is a schematic view of a first sidewall plate of a combustor inner casing according to an embodiment of the present application.

With reference to fig. 1, 3 and 8, a burner according to an embodiment of the present application includes: the burner frame 250, the burner outer shell 100, and the burner inner shell 200 located inside the burner outer shell 100, the burner inner shell 200 being located at the bottom of the burner outer shell 100. The front and rear sides of the burner housing 100 form a mounting space 202 for mounting the heat exchange device 400, and the heat exchange device 400 is mounted in the mounting space 202.

Referring to fig. 2, the burner housing 100 according to the embodiment of the present disclosure includes a front plate 110, a rear plate 120, and a U-shaped plate 130, wherein the front plate 110 and the rear plate 120 are spaced apart from each other. The rear side of the U-shaped plate 130 is riveted to the rear side plate 120, the front side of the U-shaped plate 130 is screwed to the front side plate 110, and a sealing gasket 140 is provided between the front side of the U-shaped plate 130 and the front side plate 110, so that the burner housing 100 is sealed. The riveting of the rear side plate 120 and the U-shaped plate 130 in the embodiment of the application can not only improve the assembly efficiency, but also provide initial positioning for the threaded connection of the front side plate 110 and the U-shaped plate 130, thereby facilitating the screwing in of screws; the front plate 110 is threadedly coupled to the U-shaped plate 130, which is advantageous in ensuring structural stability and reliability of the burner housing 100.

The U-shaped plate 130 is approximately U-shaped, and the U-shaped plate 130 is an integrated piece, so that the assembling procedures of the combustor shell 100 are reduced, the assembling efficiency is improved, and the risk of flue gas leakage is favorably reduced. The U-shaped plate 130 includes a bottom plate 133, a first side plate 131, and a second side plate 132, which are integrally formed, the first side plate 131 and the second side plate 132 are oppositely disposed at two ends of the bottom plate 133 at intervals, and the top ends of the first side plate 131 and the second side plate 132 may be flush.

The rear side plate 120 and the front side plate 110 both protrude from the first side plate 131 and the second side plate 132, and a mounting space 202 is formed between a part of the front side plate 110 protruding from the first side plate 131 and a part of the rear side plate 120 protruding from the first side plate 131 for mounting the heat exchange device 400. Thus, the front side plate 110 and the rear side plate 120 are both used as the side walls of the combustion chamber 201 and the installation space 202 at the same time, so that high-temperature flue gas generated by combustion of the burner can smoothly enter the heat exchange device 400, and the heat exchange device 400 exchanges heat.

The combustion frame 250 and the combustor inner shell 200 of the embodiment of the application form a combustion chamber 201 together, and the top of the combustion chamber 201 is open, so that high-temperature flue gas can enter the heat exchange device 400. The combustor inner casing 200 in the embodiment of the present application is a rectangular casing formed by enclosing four wall plates, which is not limited, of course. The burner frame 250 is fixed inside the burner housing 100, and a plurality of fire grates 300 are mounted on the burner frame 250, and only one fire grate 300 is shown in fig. 2 for illustrative purposes. The burner block 250 may include a front block and a rear block for supporting the front and rear ends of the fire grate 300, respectively, and fixedly coupled, at least one of which is fixed to the burner housing 100 by screws. The combustion frame 250 may further include an air-equalizing plate, on which a plurality of small holes are uniformly distributed, so that air in the air-intake chamber can uniformly enter each fire grate 300. A side chamber is formed between the air-equalizing plate and the rear frame of the combustion frame 250, and air in the side chamber can provide secondary air for the combustion of the fire grate 300.

The specific structure of the burner holder 250 is not limited in the embodiment of the present application. The burner of the embodiment of the present application includes a plurality of fire rows 300, and the plurality of fire rows 300 are arranged at intervals in the lateral direction (corresponding to the X-axis). Of course, the burner further includes a gas distribution rod for distributing gas to the plurality of fire banks 300, a control valve, and the like, and the embodiment of the present application is not limited herein.

Referring to fig. 8, a gap is formed between the combustion frame 250 and the bottom end of the burner housing 100 to form an air inlet chamber 205, an air inlet 1331 is formed in the bottom plate 133 of the burner housing 100, and the air inlet 1331 is communicated with the blower 600, so that the outside air can enter the air inlet chamber 205 under the action of the blower 600.

A gap is formed between the inner combustor casing 200 and the outer combustor casing 100, at least one of the inner combustor casing 200 and the outer combustor casing 100 is provided with a contact structure, so that a gap is maintained between the inner combustor casing 200 and the outer combustor casing 100 to form a cooling air duct, the cooling air duct is communicated with the air inlet cavity 205, and thus air can enter the cooling air duct through the air inlet cavity 205 to cool the inner combustor casing 200 and the outer combustor casing 100. Optionally, an abutting structure is arranged on the combustor inner shell 200, and the abutting structure abuts against the combustor outer shell 100; or, the combustor outer casing 100 is provided with an abutting structure, and the abutting structure abuts against the combustor inner casing; alternatively, the burner outer shell 100 and the burner inner shell are respectively provided with an abutting structure, and the two abutting structures abut against each other. The abutting structure can be a convex hull, a folded edge, a turned edge, a boss and the like which are arranged in a protruding mode.

The top end of the burner inner shell 200 is plugged into the top end of the burner outer shell 100, for example, the top end of the burner inner shell 200 is provided with a plug board, the top end of the burner outer shell 100 is provided with a plug interface, and the plug board is plugged into the plug interface; for another example, the top end of the inner burner housing 200 is provided with a socket, and the top end of the outer burner housing 100 is provided with a socket plate, which is plugged into the socket. The arrangement of the embodiment of the application enables the assembly of the combustor inner casing 200 and the combustor outer casing 100 to be simple and reliable, and the efficiency is high.

Referring to fig. 2, a combustor inner casing 200 according to an embodiment of the present application includes: the front wall plate 210, the back wall plate 220, first side wall plate 230 and second side wall plate 240, front wall plate 210 and back wall plate 220 set up at an interval relatively, and first side wall plate 230 and second side wall plate 240 set up at an interval relatively, and first side wall plate 230 is located the left side of front wall plate 210 and back wall plate 220, and second side wall plate 240 is located the right side of front wall plate 210 and back wall plate 220. The two sides of the front wall plate 210 are respectively abutted against the first side wall plate 230 and the second side wall plate 240, and the two sides of the rear wall plate 220 are respectively abutted against the first side wall plate 230 and the second side wall plate 240, so that the space between the first side wall plate 230 and the second side wall plate 240 can be ensured, the sufficient combustion space of the fire grate 300 is ensured, and the serious thermal deformation of each wall plate is avoided; and a deformation space can be reserved for the contraction of each wall plate.

Referring to fig. 4 to 7, a gap is formed between the front wall panel 210 and the front side panel 110 of the burner housing 100 to form a front air duct 2100, a gap is formed between the rear wall panel 220 and the rear side panel 120 of the burner housing 100 to form a rear air duct 2200, a gap is formed between the first side wall panel 230 and the first side panel 131 of the burner housing 100 to form a first air duct 2300, and a gap is formed between the second side wall panel 240 and the second side panel 132 of the burner housing 100 to form a second air duct 2400; the front air duct 2100, the rear air duct 2200, the first air duct 2300 and the second air duct 2400 are all communicated with the air inlet cavity 205; the front air duct 2100, the rear air duct 2200, the first air duct 2300, and the second air duct 2400 form a cooling air duct.

In the embodiment of the present application, the front air duct 2100 is directly communicated with the air inlet cavity 205, and the outside air in the air inlet cavity 205 can directly enter the front air duct 2100, so as to perform a main cooling function; the rear air duct 2200 is communicated with the side cavity in the combustion frame 250, part of air in the side cavity provides secondary air for the combustion of the fire grate 300, part of air in the side cavity enters the rear air duct 2200, and the air in the rear air duct 2200 is not mixed with high-temperature flue gas, so that the main cooling effect is achieved as the front air duct 2100. Of course, the front air duct 2100 and the rear air duct 2200 have gaps between the front plate 110 and the front wall plate 210 and between the rear plate 120 and the rear wall plate 220, so as to prevent heat on the front wall plate 210 and the rear wall plate 220 from being directly transferred to the burner housing 100, and thus, a certain heat transfer blocking effect is achieved.

The first air duct 2300 separates the combustion chamber 201 from the air inlet chamber 205, and the second air duct 2400 separates the combustion chamber 201 from the air inlet chamber 205, so that high-temperature flue gas in the combustion chamber 201 inevitably enters the first air duct 2300 and the second air duct 2400. Under the action of the fan 600, the air in the air inlet chamber 205 has an impact force moving towards the top of the burner inner shell 200, and the air in the air inlet chamber 205 still enters the first air duct 2300 and the second air duct 2400 to perform the cooling function, which is certainly weaker than the cooling function of the front air duct 2100 and the rear air duct 2200. Of course, the first air duct 2300 and the second air duct 2400 provide gaps between the first side wall plate 230 and the first side plate 131 and between the second side wall plate 240 and the second side plate 132, so that the heat of the first side wall plate 230 and the second side wall plate 240 can be prevented from being directly transferred to the burner housing 100, and a certain heat transfer blocking effect can be achieved.

It can be understood that, in order to improve the cooling effect of the first air duct 2300 and the second air duct 2400, the first side wall plate 230 and the second side wall plate 240 may extend toward the combustion rack 250 to the combustion rack 250 and directly communicate with the air inlet chamber 205, so that the air in the air inlet chamber 205 may directly enter the first air duct 2300 and the second air duct 2400, thereby improving the cooling effect of both sides of the burner.

The combustor of this application embodiment, both sides around combustor outer shell 100 and combustor inner shell 200, first side and second side have the clearance respectively and form the cooling air duct, not only can make outside air get into, the heat on combustor inner shell 200 and the combustor outer shell 100 is taken away in the air flow, can also avoid combustor inner shell 200 direct and combustor outer shell 100 direct contact and transfer heat, play the effect of separation heat transfer, thereby reduce the temperature of combustor outer shell 100 and combustor inner shell 200.

Specific connection structures of the front wall panel 210, the rear wall panel 220, the first side wall panel 230, and the second side wall panel 240 are described below.

Referring to fig. 9, the rear wall panel 220 is substantially rectangular, the top end of the rear wall panel 220 is bent away from the front wall panel 210 to form a rear flap 221, and part of the rear flap 221 is bent toward the combustion frame 250 to form a rear insert 222. Wherein the rear flap 221 is perpendicular to the rear wall panel 220 and the rear insert 222 is perpendicular to the rear flap 221. Referring to fig. 4, 5 and 6, the top end of the rear plate 120 of the burner housing 100 is bent away from the front plate 110 to form a rear fixing edge 121, and the rear fixing edge 121 is perpendicular to the rear plate 120. The rear fixing edge 121 is opposite to the rear folding edge 221, a rear insertion opening 122 matched with the rear insertion piece 222 is formed in the rear fixing edge 121, and the rear insertion piece 222 is inserted into the rear insertion opening 122. The rear insertion piece 222 may be provided with one rear insertion piece 222, and the rear insertion piece 222 may also be provided with a plurality of rear insertion pieces 222, for example, two, three, etc., the plurality of rear insertion pieces 222 are arranged at intervals along the length direction (corresponding to the X axis in the drawing) of the rear folded edge 221, and correspondingly, the rear insertion opening 122 is provided corresponding to the rear insertion piece 222, so that the stability and reliability of the installation of the rear wall panel 220 can be improved. The rear fixing edge 121 is further fixedly connected with the heat exchange device 400, and the rear folding edge 221 is clamped between the rear fixing edge 121 and the heat exchange device 400, so that the assembly efficiency is improved.

Referring to fig. 10, the first side wall panel 230 is substantially rectangular, the top end of the first side wall panel 230 is bent away from the second side wall panel 240 to form a first folding edge 231, and part of the first folding edge 231 is bent towards the combustion frame 250 to form a first inserting sheet 232. Wherein, the first folding edge 231 is perpendicular to the first sidewall plate 230, and the first inserting piece 232 is perpendicular to the first folding edge 231. The first insertion sheet 232 may be provided with one, the first insertion sheet 232 may be provided with a plurality of, for example, two, three, etc., and the plurality of first insertion sheets 232 are arranged at intervals along the length direction (corresponding to the Y axis in the drawing) of the first folding edge 231, so that the stability and reliability of the installation of the first side wall plate 230 can be improved. Referring to fig. 4, 5 and 6, the top end of the first side plate 131 of the burner housing 100 is bent away from the second side plate 132 to form a first fixing edge 1311, the first fixing edge 1311 is opposite to the first folding edge 231, the first fixing edge 1311 is provided with a first insertion hole 1312 matched with the first insertion piece 232, and the first insertion piece 232 is inserted into the first insertion hole 1312. The first insertion sheet 232 may be provided in one, and the first insertion sheet 232 may be provided in multiple numbers, for example, two, three, etc., the multiple first insertion sheets 232 are arranged at intervals along the length direction (corresponding to the Y axis in the figure) of the first folding edge 231, and correspondingly, the first insertion holes 1312 are provided corresponding to the first insertion sheets 232, so that the stability and reliability of the installation of the first side wall plate 230 can be improved. First fixed edge 1311 still with heat exchange device 400 fixed connection, first hem 231 is pressed from both sides and is established between first fixed edge 1311 and heat exchange device 400, does benefit to and improves the packaging efficiency.

Referring to fig. 3, the top end of the second side wall plate 240 is bent away from the first side wall plate 230 to form a second folded edge 241, and a part of the second folded edge 241 is bent towards the combustion rack 250 to form a second tab 242, referring to fig. 4, 5 and 7, the top end of the second side plate 132 of the burner housing 100 is bent away from the first side plate 131 to form a second fixed edge 1321, the second fixed edge 1321 is opposite to the second folded edge 241, and the second fixed edge 1321 is provided with a second insertion hole 1322 matched with the second tab 242. The second side wall plate 240 is inserted in the same manner as the first side wall plate 230, and will not be described herein.

Referring to fig. 3, both ends of the top of the front wall 210 extend toward the burner housing 100 to form fixing clips 211, specifically, a first end of the top of the front wall 210 extends toward the first side plate 131 to form the fixing clips 211, and a second end of the top of the front wall 210 extends toward the second side plate 132 to form the fixing clips 211. The fixing clamping edge 211 is clamped between the front side plate 110 of the burner housing 100 and the heat exchange device 400, so that a fixing structure of the front wall plate 210 is not required to be additionally arranged, the structure is simplified, and the assembly efficiency is improved; and the front side plate 110 of the burner housing 100 only needs to be provided with a sealing gasket on a vertical surface, and does not need to be provided with a sealing gasket on a horizontal surface, thereby further simplifying the structure of the burner.

The air outlet modes of the front air duct 2100 and the rear air duct 2200 are described below.

In some possible implementations, referring to fig. 8 and 9, the front wall panel 210 extends into the mounting space 202 at the top of the front side panel 110 and the rear side panel 120, and there is a gap between the top end of the front wall panel 210 and the front side panel 110 of the burner housing 100 to form an air outlet gap 212, and the air outlet gap 212 is located above the heat exchange duct of the heat exchange device 400. With such a configuration, air in the front air duct 2100 can be discharged through the smoke exhaust duct at the top of the heat exchange device 400, so that the air in the front air duct 2100 can be prevented from affecting the heat exchange duct to perform heat exchange. Alternatively, the top end of the front wall 210 abuts against the front side plate 110, and a through hole is provided at the top end of the front wall 210, so that the air in the front air duct 2100 can enter above the heat exchange pipe of the heat exchange device 400 through the through hole and then be discharged into the smoke exhaust pipe.

The top end of the rear wall panel 220 is provided with a rear flap 221, the rear flap 221 is opposite to the rear fixing edge 121 of the rear side plate 120, and the top end of the rear wall panel 220 is closed with the top end of the rear side plate 120. For this, the top of the rear wall plate 220 is provided with an air outlet 223 communicated with the rear air duct 2200, and the air outlet 223 is located above the heat exchange pipes of the heat exchange device 400. So set up, the cooling air in back wind channel 2200 can be discharged through the exhaust pipe at heat transfer device 400 top, can avoid the air of back wind channel 2200 to influence the heat transfer pipeline and carry out the heat exchange. The air outlet 223 may be a circular hole, an elliptical hole, a polygonal hole, etc., without limitation. The air outlet holes 223 can be provided in a plurality of numbers, and the air outlet holes 223 are arranged at intervals along the length direction of the rear folding edge 221, so that the air outlet efficiency is improved.

The air intake manner of the front duct 2100 and the rear duct 2200 is described below.

In some possible implementations, referring to fig. 3, an end of the front wall panel 210 near the burner rack 250 is bent and extended toward the front side panel 110 of the burner housing 100 to form a first connecting edge 216, and the first connecting edge 216 is perpendicular to the front wall panel 210. The first connecting edge 216 is bent and extended towards the combustion frame 250 to form a first abutting edge 217, and the first abutting edge 217 abuts against the front side plate 110 of the burner housing 100, so that the arrangement is favorable for ensuring the interval between the front wall plate 210 and the front side plate 110, namely, ensuring the front air duct 2100; a plurality of first through holes 2161 are arranged at intervals along the length direction of the first connecting edge 216, and the first through holes 2161 communicate the front air duct 2100 and the air inlet cavity 205, so that the air in the air inlet cavity 205 can enter the front air duct 2100 through the first through holes 2161. The first through hole 2161 may be a circular opening, a rectangular opening, etc., and is not limited herein. According to the embodiment of the application, the air entering the front air duct 2100 can be uniformly distributed in the plane of the front wall plate 210 by arranging the first through holes 2161, so that the uniformity of the air cooling effect in the front air duct 2100 is improved.

Referring to fig. 8 and 9, one end of the rear wall panel 220 adjacent to the combustion rack 250 is bent and extended toward the front wall panel 210 to form a second connecting edge 227, and the second connecting edge 227 is perpendicular to the rear wall panel 220; the second connecting edge 227 is bent and extended toward the combustion frame 250 to form a second abutting edge 228, the second abutting edge 228 is perpendicular to the second connecting edge 227, and the second abutting edge abuts against the rear side of the combustion frame 250 228, so that the deformation of the rear wall plate 220 is limited. A plurality of second through holes are arranged at intervals along the length direction of the second connecting edge 227, and the second through holes communicate the rear air duct 2200 and the air inlet chamber 205. Thus, air in the air inlet chamber 205 can enter the rear air duct 2200 through the second opening. The second through opening may be a circular opening, a rectangular opening, and the like, which is not limited herein. This application embodiment can make the air that enters into in the back wind channel 2200 even in the plane of back wallboard 220 through setting up a plurality of second mouths, improves the homogeneity of the interior air cooling effect of back wind channel 2200.

The manner in which the rear wall panel 220 abuts the front wall panel 210 on both sides will be described.

In some possible implementations, referring to fig. 5 and 6, the rear wall plate 220 has opposite first and second lateral edges, and a portion of the first and second lateral edges of the rear wall plate 220 are bent and extended toward the front wall plate 210 to form a first limiting plate 224, and the first limiting plate 224 may be perpendicular to the rear wall plate 220. Wherein a first lateral edge of the rear wall plate 220 is adjacent the first side wall plate 230 and a second lateral edge of the rear wall plate 220 is adjacent the second side wall plate 240. The part of the rear end of the first side wall plate 230 and the part of the rear end of the second side wall plate 240 respectively protrude towards the combustion chamber 201 to form a first limiting convex hull 233, and the first limiting convex hull 233 can be a circular convex hull, so that the forming by stamping is facilitated. The first limit convex hull 233 abuts against the first limit plate 224. Optionally, the first limiting plates 224 are disposed corresponding to the first limiting convex hulls 233, that is, one first limiting plate 224 abuts against one first limiting convex hull 233, a plurality of first limiting plates 224 are formed along the vertical interval of the rear wall plate 220, for example, two, three, and the like, and the number of the first limiting convex hulls 233 is the same as that of the first limiting plates 224. Of course, the first limiting plate 224 may be a strip shape extending along the vertical direction, and the first limiting plate 224 is abutted with the plurality of first limiting convex hulls 233 at the same time.

In some possible implementations, with reference to fig. 5 and 7, the front wall plate 210 has opposite first and second lateral edges, a portion of the first lateral edge and a portion of the second lateral edge of the front wall plate 210 are bent and extended toward the rear wall plate 220 to form the second limiting plate 213, and the second limiting plate 213 may be perpendicular to the front wall plate 210. Wherein a first lateral edge of the front wall panel 210 is adjacent the first side wall panel 230 and a second lateral edge of the front wall panel 210 is adjacent the second side wall panel 240. The part of the front end of the first side wall plate 230 and the part of the front end of the second side wall plate 240 respectively protrude towards the combustion chamber 201 to form a second limiting convex hull 243, and the second limiting convex hull 243 can be a circular convex hull, so that the stamping forming is facilitated. The second stopper convex hull 243 abuts against the second stopper plate 213. Optionally, the second limiting plates 213 and the second limiting convex hulls 243 are disposed correspondingly, that is, one second limiting plate 213 abuts against one second limiting convex hull 243, a plurality of second limiting plates 213, for example, two or three second limiting plates 213, are formed along the vertical interval of the front wall plate 210, and the number of the second limiting convex hulls 243 is the same as that of the second limiting plates 213. Of course, the second limiting plate 213 may be a strip extending vertically, and the second limiting plate 213 is abutted to the plurality of second limiting convex hulls 243 at the same time.

From this, all adopt butt, spacing open connected mode between each wallboard of the combustor inner shell 200 of this application embodiment, for forming inclosed combustor inner shell 200, not only can avoid sealed high-cost that brings, each wallboard and the high temperature flue gas direct contact of combustor inner shell 200 have the breathing deformation moreover, so set up can be for breathing deformation reservation deformation space.

Referring to fig. 3, a portion of the first side edge and a portion of the second side edge of the front wall plate 210 are bent and extended toward the front side plate 110 of the burner housing 100 to form a front flange 214, and the front flange 214 may be perpendicular to the front wall plate 210; not only can the front wall plate 210 be reinforced, but also the front flange 214 can be abutted against the front side plate 110, so that the front wall plate 210 is limited and the front air duct 2100 is kept smooth. It should be understood that the front flange 214 may not always abut against the front side plate 110, for example, in a normal state, the front flange 214 may have a certain gap with the front side plate 110, and when the front wall plate 210 deforms, the front flange 214 may abut against the front side plate 110, so as to prevent the front wall plate 210 from contacting with the front side plate 110 and affecting the air circulation in the front air duct 2100.

Referring to fig. 9, a portion of the first side edge and a portion of the second side edge of the back wall plate 220 are bent and extended toward the back side plate 120 of the burner housing 100 to form a back flange 225, and the back flange 225 may be perpendicular to the back wall plate 220; not only can play the effect of strengthening back wallboard 220, back turn-ups 225 can also be with the curb plate 120 butt moreover, play the effect of restriction back wallboard 220 and keep back wind channel 2200 unblocked. It should be understood that the rear flange 225 may not always abut against the rear side plate 120, for example, in a normal state, the rear flange 225 may have a certain gap with the rear side plate 120, and when the rear wall plate 220 is deformed, the rear flange 225 may abut against the rear side plate 120, so as to prevent the rear wall plate 220 from contacting the rear side plate 120 and affecting the air circulation in the rear air duct 2200.

Referring to fig. 10, a portion of the front side and a portion of the rear side of the first side wall plate 230 are bent and extended toward the first side plate 131 of the burner housing 100 to form a first flange 234, and the first flange 234 may be perpendicular to the first side wall plate 230; not only can the first side wall plate 230 be reinforced, but also the first flanging 234 can abut against the first side plate 131, so as to limit the first side wall plate 230 and keep the first air duct 2300 unblocked. It should be understood that the first flange 234 may not abut against the first side plate 131 all the time, for example, in a normal state, the first flange 234 may have a certain gap with the first side plate 131, and when the first side wall plate 230 is deformed, the first flange 234 may abut against the first side plate 131, so as to prevent the first side wall plate 230 from contacting with the first side plate 131 and affecting the air circulation in the first air duct 2300.

With continued reference to fig. 3, a portion of the front side and a portion of the rear side of the second side wall panel 240 are bent and extended toward the second side plate 132 of the burner housing 100 to form a second flange 244, and the second flange 244 may be perpendicular to the second side wall panel 240. Not only can the second side wall plate 240 be reinforced, but the first flange 234 can abut against the second side plate 132, so as to limit the second side wall plate 240 and keep the second air duct 2400 unblocked. It should be understood that the second flange 244 may not always abut against the second side plate 132, for example, in a normal state, the second flange 244 may have a certain gap with the second side plate 132, and when the second side wall plate 240 deforms, the second flange 244 may abut against the second side plate 132, so as to prevent the second side wall plate 240 from contacting the second side plate 132 and affecting the air circulation in the second air duct 2400.

In addition to the above-described abutment effect of the front flange 214, the rear flange 225, the first flange 234, and the first flange 234, the present embodiment is provided with an abutment structure, which in some possible embodiments includes a first abutment lobe 215 and a second abutment lobe 226.

Referring to fig. 3 and 7, the front wall plate 210 is provided with a first contact convex hull 215 protruding toward the front side plate 110 of the burner housing 100, and the first contact convex hull 215 can contact the front side plate 110 of the burner housing 100. The first abutment convex hull 215 may be of a truncated cone shape to facilitate machining. One or more first abutting convex hulls 215 may be provided, and a plurality of first abutting convex hulls 215 may be arranged in a rectangular matrix on the front wall plate 210. The shape, number, and arrangement of the first abutting convex hull 215 are not limited in the embodiments of the present application. The first abutting convex hull 215 not only can maintain the space between the front wall panel 210 and the front side panel 110, but also can improve the structural strength of the front wall panel 210.

Referring to fig. 6 and 9, the rear wall plate 220 is provided with a second abutment convex hull 226 that protrudes toward the rear side plate 120 of the burner housing 100, and the second abutment convex hull 226 can abut against the rear side plate 120 of the burner housing 100. The second abutment convex hull 226 may be of a truncated cone shape to facilitate machining. One or more second abutting convex hulls 226 may be provided, and a plurality of second abutting convex hulls 226 may be arranged on the rear wall plate 220 in a rectangular matrix. The shape, number, and arrangement of the second abutting convex hull 226 are not limited in the embodiment of the present application. The second abutting convex hull 226 not only serves to maintain the space between the rear wall panel 220 and the rear side panel 120, but also serves to improve the structural strength of the rear wall panel 220.

Referring to fig. 3 and 10, the abutment structure further includes a third abutment lobe 235 provided on the first side wall plate 230 and a fourth abutment lobe 245 provided on the second side wall plate 240, the third abutment lobe 235 being convex toward the first side plate 131, and the third abutment lobe 235 being capable of abutting against the first side plate 131; the fourth abutment convex hull 245 protrudes toward the second side plate 132, and the fourth abutment convex hull 245 can abut with the second side plate 132. The shape, number, and arrangement of the third abutting convex hull 235 and the fourth abutting convex hull 245 are not limited in the embodiment of the present application.

It is to be understood that the first abutment lobe 215, the second abutment lobe 226, the third abutment lobe 235 and the fourth abutment lobe 245 have a clearance without abutment with the combustor casing 100 in the normal state; when the combustor inner casing 200 is deformed, the combustor inner casing 200 abuts against the combustor outer casing 100, and a space is provided between the combustor inner casing 200 and the combustor outer casing 100, thereby maintaining the air flow in the cooling air duct.

To sum up, the burner of the gas water heater of the embodiment of the present application includes a burner outer shell 100, a burning frame 250 and a burner inner shell, the burning frame 250 and the burner inner shell form a burning chamber 201, the burning frame 250 is fixed inside the burner outer shell 100, a plurality of fire rows 300 are installed on the burning frame 250, and an air inlet chamber 205 is formed between the burning frame 250 and the bottom end of the burner outer shell 100 at an interval; there is the clearance between combustor inner shell and the combustor shell 100, be equipped with the butt structure on at least one in combustor inner shell and the combustor shell 100 to keep the clearance and form the cooling air duct between combustor inner shell and the combustor shell 100, the cooling air duct communicates with air inlet chamber 205, so air can get into the cooling air duct through air inlet chamber 205, carries out the cooling to combustor inner shell and combustor shell 100, avoids combustor inner shell 200 and combustor shell 100's high temperature and damages other parts. The top end of the burner inner shell is inserted into the top end of the burner outer shell 100, so that the assembly of the burner inner shell 200 and the burner outer shell 100 is simple and reliable, and the efficiency is high.

So far, the technical solutions of the present application have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present application is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the present application, and the technical scheme after the changes or substitutions will fall into the protection scope of the present application.

Claims (10)

1. A burner, comprising: the burner comprises a burner outer shell, a combustion frame and a burner inner shell positioned inside the burner outer shell;

the combustion frame and the combustor inner shell form a combustion chamber; the combustion rack is fixed in the combustor shell, and a plurality of fire rows are arranged on the combustion rack; a space is arranged between the combustion rack and the bottom end of the combustor shell to form an air inlet cavity; a gap is formed between the combustor inner shell and the combustor outer shell, at least one of the combustor inner shell and the combustor outer shell is provided with a butting structure, so that a cooling air channel is formed between the combustor inner shell and the combustor outer shell, and the combustor inner shell is communicated with the air inlet cavity; the top end of the combustor inner shell is inserted into the top end of the combustor outer shell.

2. The combustor as in claim 1, wherein the combustor inner casing comprises: the wall comprises a front wall plate, a rear wall plate, a first side wall plate and a second side wall plate, wherein two sides of the front wall plate are respectively abutted against the first side wall plate and the second side wall plate, and two sides of the rear wall plate are respectively abutted against the first side wall plate and the second side wall plate;

a gap is formed between the front wall plate and the combustor shell to form a front air channel, a gap is formed between the rear wall plate and the combustor shell to form a rear air channel, a gap is formed between the first side wall plate and the combustor shell to form a first air channel, and a gap is formed between the second side wall plate and the combustor shell to form a second air channel; the front air duct, the rear air duct, the first air duct and the second air duct are all communicated with the air inlet cavity; the front air duct, the rear air duct, the first air duct, and the second air duct form the cooling air duct.

3. The burner of claim 2, wherein the top end of the rear wall panel is bent away from the front wall panel and extends to form a rear folded edge, and part of the rear folded edge is bent towards the combustion frame and extends to form a rear insert;

the top end of the first side wall plate is bent and extended away from the second side wall plate to form a first folding edge, and part of the first folding edge is bent and extended towards the combustion frame to form a first inserting piece;

the top end of the second side wall plate is bent and extended away from the first side wall plate to form a second folded edge, and part of the second folded edge is bent and extended towards the combustion rack to form a second inserting piece;

a rear fixing edge, a first fixing edge and a second fixing edge are formed at the top end of the combustor shell, the rear fixing edge is opposite to the rear folded edge, and a rear insertion opening matched with the rear insertion piece is formed in the rear fixing edge; the first fixing edge is opposite to the first folded edge, and a first inserting opening matched with the first inserting piece is formed in the first fixing edge; the second fixing edge is opposite to the second folding edge, and a second inserting opening matched with the second inserting piece is formed in the second fixing edge.

4. The burner of claim 2, wherein both ends of the top of the front wall plate extend toward the burner housing to form fixing clips, respectively;

the top end of the combustor shell is used for installing a heat exchange device, and the fixing clamp edge is clamped between the combustor shell and the heat exchange device.

5. The burner of claim 4, wherein the front and rear sides of the burner housing form a mounting space for mounting the heat exchanging device; the front wall plate extends into the mounting interval, and a gap is formed between the top end of the front wall plate and the combustor shell to form an air outlet gap; the top of back wallboard be provided with the exhaust vent of back wind channel intercommunication, the exhaust vent with the air-out clearance all is located heat transfer device's heat transfer pipeline's top.

6. The burner as claimed in any one of claims 2 to 5, wherein a portion of the first lateral edge and a portion of the second lateral edge of the rear wall plate extend toward the front wall plate to form a first limit plate, and a portion of the rear end of the first side wall plate and a portion of the rear end of the second side wall plate respectively protrude toward the combustion chamber to form a first limit convex hull, and the first limit convex hull abuts against the first limit plate;

the partial first side edge and the partial second side edge of preceding wallboard move towards back wallboard bending and extending forms the second limiting plate, the part of first side wallboard front end and the part of second side wallboard front end moves towards respectively the protruding spacing convex closure of second that forms in the combustion chamber, the spacing convex closure of second with the butt of second limiting plate.

7. The burner according to any one of claims 2 to 5, wherein a portion of the first side edge and a portion of the second side edge of the front wall plate are bent and extended toward the burner housing to form a front flange;

part of the first side edge and part of the second side edge of the rear wall plate bend and extend towards the burner shell to form rear flanges;

part of the front side edge and part of the rear side edge of the first side wall plate bend and extend towards the burner shell to form a first flanging;

and part of the front side edge and part of the rear side edge of the second side wall plate bend and extend towards the burner shell to form a second flanging.

8. The burner according to any one of claims 2 to 5, wherein the front wall plate is provided with a first abutment convex hull protruding toward the burner housing, the first abutment convex hull being capable of abutting against the burner housing;

a second abutting convex hull protruding towards the combustor shell is arranged on the rear wall plate, and the second abutting convex hull can abut against the combustor shell;

the abutment structure comprises the first abutment lobe and the second abutment lobe.

9. The burner as claimed in any one of claims 2 to 5, wherein an end of the front wall panel adjacent to the burner block is bent and extended toward the burner housing to form a first connecting edge, and the first connecting edge is bent and extended toward the burner block to form a first abutting edge, and the first abutting edge abuts against the burner housing; a plurality of first through openings are arranged at intervals along the length direction of the first connecting edge, and the first through openings are communicated with the front air duct and the air inlet cavity;

one end, close to the combustion frame, of the rear wall plate bends and extends towards the front wall plate to form a second connecting edge, the second connecting edge bends and extends towards the combustion frame to form a second abutting edge, and the second abutting edge abuts against the combustion frame; and a plurality of second through openings are arranged at intervals along the length direction of the second connecting edge and communicated with the rear air duct and the air inlet cavity.

10. A gas water heater, comprising: the burner of any one of claims 1 to 9, wherein the heat exchange device is positioned at the top of the burner, the fan is arranged at the bottom end of the burner, and the fan is communicated with an air inlet cavity of the burner.

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