Condensing heat exchanger and gas water heater

Abstract

The condensing heat exchanger comprises a shell, the shell comprises a shell body and an air cavity arranged in the shell body, a smoke inlet is formed in the peripheral side of the shell body, a smoke outlet is formed in the upper side of the shell body, a water outlet is formed in the lower side of the shell body, and the smoke inlet is communicated with the smoke outlet. The smoke inlet, the smoke outlet and the water outlet are all communicated with the air cavity; the condensate water path structure is mounted in the shell; the first liquid sealing plate is arranged in the air cavity and located between the smoke inlet and the condensate water path structure, a first smoke inlet area is arranged on the upper portion of the first liquid sealing plate, a second smoke inlet area is arranged on the lower portion of the first liquid sealing plate, a first smoke inlet hole is formed in the first smoke inlet area, and a second smoke inlet hole is formed in the second smoke inlet area; the equivalent area of the first smoke inlet hole is the equivalent area corresponding to the smoke concentration C required by the national standard when the gas water heater burns with the maximum load.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of home appliances, especially to a condensing heat exchanger and a gas water heater. BACKGROUND

[0002] In order to improve the heat exchange efficiency, the existing gas water heater is generally provided with a condensing heat exchanger on one side of the main heat exchanger to further exchange heat with the high-temperature flue gas discharged by the main heat exchanger. However, when the condensate water produced by the condensing heat exchanger blocks the drainage channel, it is easy to enter the main heat exchanger. Therefore, the prior art generally provides a water level sensor to detect the water level of the condensate water so as to issue an alarm when the water level of the condensate water reaches the warning line and stop the gas water heater from working, thereby ensuring the safety of the gas water heater. However, the water level sensor is prone to failure in actual use, resulting in unstable detection effect and causing the gas water heater to be prone to safety accidents.

[0003] Therefore, there is an urgent need for a gas water heater to solve the above problems. SUMMARY

[0004] The utility model aims at at least in a certain extent solves one of the problems existing in prior art related, and for this purpose, the utility model provides a kind of condensing heat exchanger, can effectively and stably detect the water level of condensate water, avoid condensate water into the main heat exchanger of gas water heater.

[0005] The above-mentioned purpose is realized by the following technical solutions:

[0006] A kind of condensing heat exchanger, comprising:

[0007] Shell, the shell includes shell body and the air cavity being arranged in the shell body, the circumferential side of the shell body is provided with smoke inlet, the upper side of the shell body is provided with smoke outlet, the lower side of the shell body is provided with water outlet, the smoke inlet, the smoke outlet and the water outlet are communicated with the air cavity;

[0008] Condensate water path structure, is installed in the shell;

[0009] First liquid seal plate, is arranged in the air cavity and is located between the smoke inlet and the condensate water path structure, the upper portion of the first liquid seal plate is provided with first smoke inlet area, the lower portion of the first liquid seal plate is provided with second smoke inlet area, the first smoke inlet area is provided with first smoke inlet hole, the second smoke inlet area is provided with second smoke inlet hole, the sum of the area of the first smoke inlet hole and the second smoke inlet hole is greater than the area of the smoke inlet, and the equivalent area of the first smoke inlet hole is the equivalent area corresponding to the flue gas concentration C required by national standard when the gas water heater is combusted at maximum load.

[0010] Optionally, the condensate water path structure comprises:

[0011] a plurality of groups of water pipe assemblies, the first liquid seal plate being located between the smoke inlet and the plurality of groups of water pipe assemblies;

[0012] a first waterway adapter plate comprising a first waterway plate body and a plurality of first adapter waterways provided on the first waterway plate body, and two adjacent groups of the water pipe assemblies being connected through one of the first adapter waterways;

[0013] a second waterway adapter plate comprising a second waterway plate body and a plurality of second adapter waterways provided on the second waterway plate body, and two adjacent groups of the water pipe assemblies being connected through one of the second adapter waterways.

[0014] Optionally, opposite two ends of the shell body are provided with openings, the first waterway plate body is arranged at one of the openings and is in sealed connection with the shell body, the second waterway plate body is arranged at the other opening and is in sealed connection with the shell body, and the shell body, the first waterway plate body and the second waterway plate body enclose the air cavity.

[0015] Optionally, a downwardly recessed flow guide groove is formed in the bottom side of the shell body, and the water outlet is formed in the flow guide groove.

[0016] Optionally, the liquid seal structure further comprises:

[0017] a liquid seal box, an inner cavity of which is provided with a water inlet hole communicating with the water outlet and the cavity, and a water outlet hole communicating with the drainage structure and the cavity is formed in the lower part of the liquid seal box;

[0018] a second liquid seal plate arranged in the cavity, an upper end of the second liquid seal plate being connected with the upper side plate of the liquid seal box, and a lower end of the second liquid seal plate having a water inlet gap with the lower side plate of the liquid seal box;

[0019] a third liquid seal plate arranged in the cavity and spaced apart from the second liquid seal plate, a lower end of the third liquid seal plate being connected with the lower side plate of the liquid seal box, and an upper end of the third liquid seal plate having a water outlet gap with the upper side plate of the liquid seal box, the water inlet hole being located on a side of the second liquid seal plate away from the third liquid seal plate, and the water outlet hole being located on a side of the third liquid seal plate away from the second liquid seal plate.

[0020] Optionally, the liquid seal structure further comprises a water level detector arranged on the upper part of the cavity, the water level detector being used for detecting water level information in the cavity and transmitting the water level information to a control unit of the gas water heater.

[0021] The utility model discloses a gas water heater on the other side provides a kind of, including main heat exchanger and the condensing heat exchanger described above, the main heat exchanger includes shell, fan and the combustion heat exchanger being arranged in the shell, the shell is equipped with air inlet and flue gas outlet, the smoke inlet is communicated with the flue gas outlet, the lowest point of the flue gas outlet is higher than the lowest point of the smoke inlet setting, the fan is installed at the air inlet, the wind cooling channel is arranged between the shell and the combustion heat exchanger, one end of the wind cooling channel is communicated with the air inlet, and the other end is communicated with the flue gas outlet.

[0022] Optionally, the combustion heat exchanger includes a combustion cavity arranged in the shell, a burner arranged in the combustion cavity and a heat exchanger arranged in the combustion cavity, and the wind cooling channel is located between the shell and the combustion cavity.

[0023] Optionally, the wind cooling channel includes a front side wind cooling channel, a rear side wind cooling channel, a left side wind cooling channel and a right side wind cooling channel, the front side wind cooling channel is located between a front side plate of the shell and a front side wall of the combustion cavity, the rear side wind cooling channel is located between a rear side plate of the shell and a rear side wall support of the combustion cavity, the left side wind cooling channel is located between a left side plate of the shell and a left side wall of the combustion cavity, and the right side wind cooling channel is located between a right side plate of the shell and a right side wall of the combustion cavity.

[0024] Optionally, the flue gas outlet and the smoke inlet are communicated through a flue pipe.

[0025] Compared with the prior art, the utility model at least has the following beneficial effects:

[0026] The condensing heat exchanger provided by the utility model, when the flue gas enters the condensing water path structure, the high-temperature flue gas exchanges heat with the condensing water path, when condensate is generated on the condensing water path structure, the condensate accumulates in the air cavity and is discharged from the water outlet, when the water outlet is blocked, the water level of the condensate gradually rises, the second smoke inlet is gradually submerged, the resistance of the fan of the gas water heater gradually increases, the rotating speed of the fan gradually increases, when the water level of the condensate rises and submerges the second smoke area, the flue gas entering the condensing water path structure through the first liquid seal plate is reduced to a preset value (the flue gas concentration C required by the national standard), the rotating speed of the fan of the gas water heater is also increased to a preset highest threshold value, at this time, the system stops working and performs alarm processing, so that the problem that the condensate in the air cavity continuously increases and finally flows into the combustion heat exchanger of the gas water heater is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a perspective structural schematic view of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0028] Figure 2 is Figure 1 an exploded view of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0029] Figure 3 is one of sectional views of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0030] Figure 4 is the second sectional view of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0031] Figure 5 is one of sectional views of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0032] Figure 6 is a perspective structural schematic view of the condensing heat exchanger of the water heater provided by the embodiment of the utility model, and

[0033] Figure 7 is the second sectional view of the condensing heat exchanger of the water heater provided by the embodiment of the utility model.

[0034] In the drawing,

[0035] 10, condensing heat exchanger; 1, shell; 11, shell body; 111, smoke inlet; 112, smoke outlet; 113, water outlet; 114, flow guide groove; 100, air cavity;

[0036] 20, main heat exchanger; 2, condensing water path structure; 21, water pipe assembly; 211, water pipe; 22, first water path adapter plate; 221, first water path plate body; 222, first adapter water path; 23, second water path adapter plate; 231, second water path plate body; 232, second adapter water path; 24, water inlet connector; 25, water outlet connector;

[0037] 3. First liquid seal plate; 31, first smoke inlet area; 301, first smoke inlet hole; 32, second smoke inlet area; 302, second smoke inlet hole;

[0038] 4, liquid seal structure; 41, liquid seal box; 40, cavity; 42, water inlet hole; 43, water outlet hole; 44, water level detector; 451, second liquid seal plate; 452, third liquid seal plate;

[0039] 5, condensing water pipe;

[0040] 6, shell;

[0041] 7, flue;

[0042] 81, burner; 82, heat exchanger;

[0043] 9, fan;

[0044] 200, combustion chamber;

[0045] 301, front side air cooling channel; 302, rear side air cooling channel; 303, left side air cooling channel; 304, right side air cooling channel. DETAILED DESCRIPTION

[0046] The following examples are used to illustrate the present application, but the present application is not limited by these examples. Modifications to the specific embodiments of the present application or equivalent replacements to some technical features are made without departing from the spirit of the present application, and they should be included in the technical solution range of the present application.

[0047] Please refer to Figures 1-7 The present application provides a condensing heat exchanger 20, comprising a shell 1, a condensate water path structure 2 and a first liquid seal plate 3. The shell 1 comprises a shell body 11 and a gas cavity 100 arranged in the shell body 11, a flue inlet 111 is arranged on the side of the shell body 11, a flue outlet 112 is arranged on the upper side of the shell body 11, and a water outlet 113 is arranged on the lower side of the shell body 11. The flue inlet 111, the flue outlet 112 and the water outlet 113 are all communicated with the gas cavity 100. The condensate water path structure 2 is installed in the shell 1. The first liquid seal plate 3 is arranged in the gas cavity 100 and located between the flue inlet 111 and the condensate water path structure 2. The upper part of the first liquid seal plate 3 is provided with a first flue inlet area 31, and the lower part of the first liquid seal plate 3 is provided with a second flue inlet area 32. The first flue inlet area 31 is provided with a first flue inlet hole 301, and the second flue inlet area 32 is provided with a second flue inlet hole 302. The sum of the areas of the first flue inlet hole 301 and the second flue inlet hole 302 is greater than the area of the flue inlet 111. The equivalent area of the first flue inlet hole 301 is the equivalent area corresponding to the flue gas concentration C required by the national standard when the gas water heater is combusted at the maximum load.

[0048] The condensing heat exchanger 2082 provided by the utility model, flue gas enters the condensing water path structure 2 through the first smoke inlet hole 301 and the second smoke inlet hole 302 of the first liquid seal plate 3, and then is discharged from the smoke outlet 112 after heat exchange, when the flue gas enters the condensing water path structure 2, the high-temperature flue gas exchanges heat with the condensing water path, when the condensing water path structure 2 produces condensing water, the condensing water accumulates in the air cavity 100 and is discharged from the water outlet 113, when the water outlet 113 is blocked, the water level of the condensing water gradually rises, the second smoke inlet hole 302 is gradually submerged, the resistance of the fan 9 of the gas water heater gradually increases, the rotating speed of the fan 9 gradually increases, when the water level of the condensing water rises and submerges the second smoke area 32, the flue gas entering the condensing water path structure 2 through the first liquid seal plate 3 is reduced to a preset value (the flue gas concentration C required by the national standard), the rotating speed of the fan 9 of the gas water heater is also increased to a preset maximum threshold value, at this time, the system stops working and carries out alarm processing, thereby avoiding the problem that the water level of the condensing water in the air cavity 100 continuously increases and finally leads to the condensing water flowing into the combustion heat exchanger 82 of the gas water heater. Compared with the liquid level sensor detection liquid level mode in the prior art, it has a more safe and reliable effect, because in actual application, the liquid level sensor is extremely easy to fail, leading to liquid level detection failure.

[0049] At present, the national standard requires that when the water outlet 113 is blocked and the flue gas reaches 2000ppm, the system must alarm.

[0050] Optionally, the condensing water path structure 2 comprises a plurality of water pipe assemblies 21, a first water path adapter plate 22 and a second water path adapter plate 23. The first liquid seal plate 3 is located between the smoke inlet 111 and the plurality of water pipe assemblies 21. The first water path adapter plate 22 comprises a first water path plate body 221 and a plurality of first adapter water paths 222 arranged on the first water path plate body 221, and adjacent two water pipe assemblies 21 are communicated through a first adapter water path 222. The second water path adapter plate 23 comprises a second water path plate body 231 and a plurality of second adapter water paths 232 arranged on the second water path plate body 231, and adjacent two water pipe assemblies 21 are communicated through a second adapter water path 232.

[0051] Optionally, the condensing water path structure 2 further comprises a water inlet connector 24 and a water outlet connector 25, the water inlet connector 24 is communicated with a first adapter water path 222, and the water outlet connector 25 is communicated with another first adapter water path 222.

[0052] Optionally, the water pipe assembly 21 comprises a plurality of water pipes 211.

[0053] Optionally, the shell body 11 is provided with openings at opposite ends, the first waterway plate body 221 is arranged at one of the openings and is in sealed connection with the shell body 11, the second waterway plate body 231 is arranged at the other opening and is in sealed connection with the shell body 11, and the shell body 11, the first waterway plate body 221 and the second waterway plate body 231 form the air cavity 100, which is simple and compact in structure.

[0054] Optionally, the bottom side of the shell body 11 is provided with a downwardly recessed flow guide groove 114, and the water outlet 113 is arranged in the flow guide groove 114. The flow guide groove 114 is arranged to guide the condensed water at the bottom side of the shell body 11 to the water outlet 113.

[0055] Optionally, the liquid seal structure 4 is further arranged, and the liquid seal structure 4 comprises a liquid seal box 41, a second liquid seal plate 451 and a third liquid seal plate 452. The liquid seal box 41 is provided with a cavity 40, the upper portion of the liquid seal box 41 is provided with a water inlet hole 42 which is in communication with the water outlet 113 and the cavity 40, and the lower portion of the liquid seal box 41 is provided with a water outlet hole 43 which is in communication with the drainage structure and the cavity 40. The second liquid seal plate 451 is arranged in the cavity 40, the upper end of the second liquid seal plate 451 is connected with the upper side plate of the liquid seal box 41, and the lower end of the second liquid seal plate 451 has a water inlet gap with the lower side plate of the liquid seal box 41. The third liquid seal plate 452 is arranged in the cavity 40 in a spaced manner with the second liquid seal plate 451, the lower end of the third liquid seal plate 452 is connected with the lower side plate of the liquid seal box 41, and the upper end of the third liquid seal plate 452 has a water outlet gap with the upper side plate of the liquid seal box 41. The water inlet hole 42 is located on the side of the second liquid seal plate 451 away from the third liquid seal plate 452, and the water outlet hole 43 is located on the side of the third liquid seal plate 452 away from the second liquid seal plate 451. The condensed water in the air cavity 100 flows into the cavity 40 through the water outlet 113, then flows out to the water outlet hole 43 through the water inlet gap and the water outlet gap, and then is discharged to the outside of the gas water heater through the drainage structure, while avoiding the flue gas from being discharged through the water outlet hole 43.

[0056] Optionally, the water outlet 113 and the water inlet hole 42 are in communication through a condensed water pipe 5211.

[0057] Optionally, the liquid seal structure 4 further comprises a water level detector 44 arranged at the upper portion of the cavity 40, which is used to detect the water level information in the cavity 40 and transmit the water level information to the control unit of the gas water heater. Specifically, when the drainage structure is blocked, the condensed water in the cavity 40 gradually rises, and when the water level rises to a preset position, the water level detector 44 is turned on, thereby detecting the information that the drainage structure is blocked, and at this time, the control unit issues an alarm.

[0058] In the embodiment, when the water level detector 44 fails, the water level in the cavity 40 continues to rise, and the condensed water gradually accumulates in the air cavity 100 and continues to rise in the air cavity 100. When the water level submerges the second smoke inlet area 32 of the first liquid seal plate 3, the rotating speed of the fan 9 reaches a preset highest threshold value, at this time, the system stops working and performs alarm processing, thereby avoiding the problem that the water level of the condensed water in the air cavity 100 continues to rise and finally causes the condensed water to flow into the combustion heat exchanger 82 of the gas water heater. The embodiment provides a double condensed water level detection function, and effectively reduces the problem that the condensed water enters the combustion heat exchanger 82.

[0059] The utility model discloses a gas water heater on the other aspect, including main heat exchanger 1082 and above -mentioned condensed heat exchanger 2082, main heat exchanger 1082 includes shell 6, fan 9 and set up in the combustion heat exchanger 82 of shell 6, be equipped with air inlet and flue gas outlet on shell 6, and the smoke inlet 111 is connected with flue gas outlet, and the lowest of flue gas outlet is higher than the lowest height of smoke inlet 111 height setting, to avoid when the condensed water has not submerged second smoke inlet area 32, condensed water enters combustion heat exchanger 82, fan 9 installs at air inlet, and the air cooling channel is arranged between shell 6 and combustion heat exchanger 82, and one end of air cooling channel is communicated with air inlet, and the other end is communicated with flue gas outlet, and fan 9 draws the cold wind of outside into air cooling channel, and the cold wind in air cooling channel is heated and the high temperature flue gas generated in combustion heat exchanger 82 all flow to condensed heat exchanger 2082 in flue gas outlet through the negative pressure generated in fan 9 and carry out further heat exchange.

[0060] Optionally, the combustion heat exchanger 82 includes a combustion cavity 200 arranged in the shell 6, a burner 81 arranged in the combustion cavity 200, and a heat exchanger 82 arranged in the combustion cavity 200. The air cooling channel is located between the shell 6 and the combustion cavity 200. The fan 9 sucks the cold air from the outside into the air cooling channel, cools the inner wall of the combustion cavity 200, and the cold air is heated. The heated cold air is discharged to the condensed heat exchanger 2082 through the flue gas outlet for heat exchange, so as to improve the heat exchange efficiency of the gas water heater and avoid overheating of the shell 6.

[0061] Optionally, the air cooling channel includes a front air cooling channel 301, a rear air cooling channel 302, a left air cooling channel 303, and a right air cooling channel 304. The front air cooling channel 301 is located between the front side plate of the shell 6 and the front side wall of the combustion cavity 200. The rear air cooling channel 302 is located between the rear side plate of the shell 6 and the rear side wall support of the combustion cavity 200. The left air cooling channel 303 is located between the left side plate of the shell 6 and the left side wall of the combustion cavity 200. The right air cooling channel 304 is located between the right side plate of the shell 6 and the right side wall of the combustion cavity 200. By arranging the front air cooling channel 301, the rear air cooling channel 302, the left air cooling channel 303, and the right air cooling channel 304, uniform cooling and heat exchange of the cavity wall of the combustion cavity 200 are realized.

[0062] Optionally, a flue pipe 7 is further included, and the flue gas outlet and the flue gas inlet 111 are communicated through the flue pipe 7. By arranging the flue pipe 7, the flue gas of the main heat exchanger 1082 is guided into the condensing heat exchanger 2082.

[0063] The above merely describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A condensing heat exchanger, characterized by, The application relates to a gas water heater, which comprises the following parts: an outer shell (1) comprising an outer shell body (11) and an air cavity (100) arranged in the outer shell body (11), a smoke inlet (111) being formed on the lateral side of the outer shell body (11), a smoke outlet (112) being formed on the upper side of the outer shell body (11), and a water outlet (113) being formed on the lower side of the outer shell body (11), wherein the smoke inlet (111), the smoke outlet (112) and the water outlet (113) are all communicated with the air cavity (100); a condensate water path structure (2) arranged in the outer shell (1); a first liquid seal plate (3) arranged in the air cavity (100) and located between the smoke inlet (111) and the condensate water path structure (2), wherein the upper part of the first liquid seal plate (3) is provided with a first smoke inlet area (31), the lower part of the first liquid seal plate (3) is provided with a second smoke inlet area (32), a first smoke inlet hole (301) is formed on the first smoke inlet area (31), a second smoke inlet hole (302) is formed on the second smoke inlet area (32), the sum of the areas of the first smoke inlet hole (301) and the second smoke inlet hole (302) is greater than the area of the smoke inlet (111), and the equivalent area of the first smoke inlet hole (301) is equivalent to the equivalent area corresponding to the smoke concentration C required by the national standard when the gas water heater is combusted at the maximum load.

2. The condensing heat exchanger according to claim 1, wherein The condensate water path structure (2) comprises: a plurality of water pipe assemblies (21), wherein the first liquid seal plate (3) is located between the smoke inlet (111) and the plurality of water pipe assemblies (21); a first water path adapter plate (22) comprising a first water path plate body (221) and a plurality of first adapter water paths (222) arranged on the first water path plate body (221), wherein two adjacent water pipe assemblies (21) are communicated through one first adapter water path (222); a second water path adapter plate (23) comprising a second water path plate body (231) and a plurality of second adapter water paths (232) arranged on the second water path plate body (231), wherein two adjacent water pipe assemblies (21) are communicated through one second adapter water path (232).

3. The condensing heat exchanger according to claim 2, wherein One of the opposite ends of the outer shell body (11) is provided with an opening, the first water path plate body (221) is arranged at one of the openings and is sealingly connected with the outer shell body (11), the second water path plate body (231) is arranged at the other opening and is sealingly connected with the outer shell body (11), and the outer shell body (11), the first water path plate body (221) and the second water path plate body (231) form the air cavity (100).

4. The condensing heat exchanger of claim 1, wherein The bottom side of the outer shell body (11) is provided with a downwardly recessed flow guide groove (114), and the water outlet (113) is formed in the flow guide groove (114).

5. The condensing exchanger according to any of claims 1-4, characterized in that, The application further relates to a liquid seal structure (4) comprising: A liquid seal box (41) is provided with a cavity (40) therein, an upper portion of the liquid seal box (41) is provided with a water inlet hole (42) communicating with the water outlet (113) and the cavity (40), and a lower portion of the liquid seal box (41) is provided with a water outlet hole (43) communicating with a drainage structure and the cavity (40); A second liquid seal plate (451) is arranged in the cavity (40), an upper end of the second liquid seal plate (451) is connected with an upper side plate of the liquid seal box (41), and a lower end of the second liquid seal plate (451) has a water inlet gap (4510) with a lower side plate of the liquid seal box (41); A third liquid seal plate (452) is arranged in the cavity (40) and spaced apart from the second liquid seal plate (451), a lower end of the third liquid seal plate (452) is connected with the lower side plate of the liquid seal box (41), and an upper end of the third liquid seal plate (452) has a water outlet gap (4520) with the upper side plate of the liquid seal box (41), the water inlet hole (42) is located on a side of the second liquid seal plate (451) away from the third liquid seal plate (452), and the water outlet hole (43) is located on a side of the third liquid seal plate (452) away from the second liquid seal plate (451).

6. The condensing heat exchanger of claim 5, wherein The liquid seal structure (4) further comprises a water level detector (44) arranged at an upper portion of the cavity (40), the water level detector (44) is used for detecting water level information in the cavity (40) and transmitting the water level information to a control unit of the gas water heater.

7. A gas water heater comprising a main heat exchanger (10) and the condensing heat exchanger (20) according to any one of claims 1-6, the main heat exchanger (10) comprising a shell (6), a fan (9) and a combustion heat exchanger arranged in the shell (6), the shell (6) is provided with an air inlet and a flue gas outlet, the flue gas inlet (111) is in communication with the flue gas outlet, the lowest part of the flue gas outlet is higher than the lowest part of the flue gas inlet (111), the fan (9) is installed at the air inlet, and a wind cooling channel is arranged between the shell (6) and the combustion heat exchanger, one end of the wind cooling channel is in communication with the air inlet, and the other end is in communication with the flue gas outlet.

8. The gas water heater of claim 7, wherein, The combustion heat exchanger comprises a combustion cavity (200) arranged in the shell (6), and a burner (81) and a heat exchanger (82) arranged in the combustion cavity (200), and the wind cooling channel is located between the shell (6) and the combustion cavity (200).

9. The gas water heater of claim 8, wherein, The air cooling channel comprises a front side air cooling channel (301), a rear side air cooling channel (302), a left side air cooling channel (303) and a right side air cooling channel (304), the front side air cooling channel (301) is located between the front side plate of the shell (6) and the front side wall of the combustion cavity (200), the rear side air cooling channel (302) is located between the rear side plate of the shell (6) and the rear side wall support of the combustion cavity (200), the left side air cooling channel (303) is located between the left side plate of the shell (6) and the left side wall of the combustion cavity (200), and the right side air cooling channel (304) is located between the right side plate of the shell (6) and the right side wall of the combustion cavity (200).

10. The gas water heater of claim 7, wherein, A smoke pipe (7) is further included, and the flue gas outlet and the smoke inlet (111) are communicated through the smoke pipe (7).

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