CN218993686U - Heat exchanger and gas water heater - Google Patents

Abstract

The utility model belongs to the technical field of heat supply, and particularly discloses a heat exchanger and a gas water heater. The heat exchanger comprises a shell, heat exchange fins and a heat exchange tube assembly, wherein the heat exchange fins and the heat exchange tube assembly are arranged in the shell, the shell comprises a heat radiation side wall, the heat exchange tube assembly comprises a water inlet tube, a water outlet tube, a heat exchange tube and a heat radiation tube, the water inlet tube extends in a first plane, and the water outlet tube extends in a second plane; the heat exchange tube is arranged on the heat exchange fin in a penetrating way, and the water inlet end of the heat exchange tube is connected with the water inlet pipe; the both ends of cooling tube are connected respectively the play water end and the outlet pipe of heat exchange tube, and the cooling tube sets up outside the casing and laminating in the heat dissipation lateral wall. According to the heat exchanger disclosed by the utility model, the shell can be effectively cooled through the radiating pipe, the structure is simple, and the service life of the heat exchanger is prolonged; the gas water heater is provided with the heat exchanger, the shell of the heat exchanger is not easy to change color, the water flow of the whole machine is improved, and the gas water heater has reliability and low cost.

Description

Heat exchanger and gas water heater

Technical Field

The utility model relates to the technical field of heat supply, in particular to a heat exchanger and a gas water heater.

Background

The gas water heater is a heating device which generates heat through the combustion of combustible gas, thereby providing heat for water in the heat exchanger to heat and generate hot water. The high-temperature flue gas generated by the combustion of the combustible gas enters the heat exchanger, and the heat exchange fins in the heat exchanger block the high-temperature flue gas so as to heat water in the heat exchange tube.

The gas water heater comprises a heat exchanger shell and a combustion chamber shell, wherein the heat exchanger shell dissipates heat through heat exchange fins in the heat exchanger, and the combustion chamber shell is coiled on the surface of the shell through a heat exchange tube to cool the shell. Because copper has better heat-conducting property, the shell of heat exchange tube and heat exchanger adopts oxygen-free copper to make generally, and when heat exchange fin and heat exchanger shell are not closely connected, the shell surface temperature rise is faster and the temperature is high, can cause the casing of copper to discolour, and long-time high temperature makes the shell surface appear perforating easily, and then influences the life of heat exchanger.

Disclosure of Invention

One of the technical problems to be solved by the utility model is to provide a heat exchanger which can effectively cool a shell and prolong the service life of the heat exchanger.

The second technical problem to be solved by the utility model is to provide the gas water heater, wherein the shell of the heat exchanger is not easy to change color, the water flow of the whole gas water heater is improved, and the gas water heater has reliability and low cost.

The first technical problem is solved by the following technical scheme:

in a first aspect, there is provided a heat exchanger comprising:

the heat exchange device comprises a shell and heat exchange fins arranged in the shell, wherein the shell comprises a heat radiation side wall;

a heat exchange tube assembly, the heat exchange tube assembly comprising:

the water inlet pipe extends in a first plane, and the water outlet pipe extends in a second plane;

the heat exchange tube is arranged on the heat exchange fin in a penetrating way, and the water inlet end of the heat exchange tube is connected with the water inlet pipe;

the heat dissipation pipe, the both ends of heat dissipation pipe are connected respectively the play water end of heat exchange tube with the outlet pipe, the heat dissipation pipe set up in outside the casing and laminate in the heat dissipation lateral wall.

Compared with the background technology, the heat exchanger has the following beneficial effects: the heat dissipation pipe is attached to the heat dissipation side wall, the water outlet end of the heat exchange pipe is close to the heat dissipation side wall, the heat dissipation pipe can greatly reduce the temperature of the area on the shell, the color change of the heat dissipation side wall caused by the surface temperature rise is avoided, and the reliability is improved; and the radiating pipe arranged on the outer side of the shell can not be heated when water is stopped, so that the water stopping temperature rise effect is reduced, and the water temperature in the water outlet pipe is prevented from being too high when the water heater is used again.

In one embodiment, the heat dissipation pipe comprises a connecting section and a heat dissipation section, the connecting section is connected with the heat exchange pipe, the heat dissipation section is connected with the water outlet pipe, and the heat dissipation section is attached to the heat dissipation side wall.

In one embodiment, the connecting section comprises a bent pipe, a straight pipe and a transition pipe which are sequentially connected, wherein the bent pipe is connected with the heat exchange pipe, the transition pipe is bent from the straight pipe to the direction of the shell, and the transition pipe is connected with the heat dissipation section.

In one embodiment, the length of the heat dissipation side wall is H, and the length of the straight pipe is L, so that the length of the straight pipe is 25mm less than or equal to L less than or equal to 0.5H.

In one embodiment, the heat dissipating section extends along a length of the heat dissipating sidewall.

In one embodiment, the heat exchange tube comprises a heat exchange straight tube and a heat exchange bent tube, a plurality of heat exchange straight tubes penetrate through the heat exchange fins and are located in the shell, the heat exchange straight tubes are parallel to each other and are arranged at intervals, and two adjacent heat exchange straight tubes are connected through the heat exchange bent tube.

In one embodiment, the heat exchange tube assembly further comprises a bypass tube, one end of the bypass tube is connected with the water inlet tube, the other end of the bypass tube is connected with the radiating tube and/or the water outlet tube, and the bypass tube is arranged outside the shell.

The second technical problem is solved by the following technical scheme:

the utility model provides a gas heater, including foretell heat exchanger to and combustion assembly, combustion assembly including connect in the burning box of casing, the burning box is formed with forced air cooling passageway and combustion chamber, forced air cooling passageway with the combustion chamber intercommunication.

Compared with the background technology, the gas water heater has the beneficial effects that: the gas water heater is provided with a combustion assembly, the shell of the combustion assembly is cooled by utilizing an air cooling mode, a coiled pipe shape outside the shell of the combustion assembly is not formed any more, the flow resistance of water can be reduced, the water flow of the whole machine is improved, and the use of copper materials is reduced; the radiating pipe radiates heat and cools the radiating side wall on the shell, so that the discoloration caused by the temperature rise formed by the radiating side wall close to the water outlet end of the heat exchange pipe is avoided, the water cut-off temperature rise effect can be reduced, and the gas water heater has reliability and low cost.

In one embodiment, the combustion box comprises an outer shell and an inner shell, the outer shell is sleeved outside the inner shell, the air cooling channel is formed between the outer shell and the inner shell at intervals, an air inlet hole is formed in the upper side of the outer shell, an air outlet hole is formed in the lower side of the inner shell, the air inlet hole is communicated with the air cooling channel, and the air cooling channel is communicated with the combustion chamber through the air outlet hole.

In one embodiment, the gas water heater further comprises a fume collection hood, and the heat exchanger further comprises an upper fixing bracket detachably connected between the shell and the fume collection hood; and/or, the heat exchanger further comprises a lower fixing bracket which is detachably connected between the shell and the combustion box body.

Drawings

Fig. 1 is a schematic structural diagram of a heat exchanger according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1 in a disassembled state;

FIG. 3 is a side view of a heat exchanger according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram illustrating a partial structure of a gas water heater according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a part of the structure of a gas water heater according to an embodiment of the present utility model;

fig. 6 is a structural cross-sectional view of a combustion case provided in an embodiment of the present utility model.

Description of the reference numerals:

1. a housing; 2. a heat exchange fin; 3. a heat exchange tube assembly; 31. a water inlet pipe; 311. a water outlet of the water inlet pipe; 32. a heat exchange tube; 321. a heat exchange straight pipe; 322. a heat exchange elbow; 33. a water outlet pipe; 331. a water inlet of the water outlet pipe; 34. a heat radiating pipe; 341. a connection section; 3411. bending the pipe; 3412. a straight pipe; 3413. a transition pipe; 342. a heat dissipation section; 35. a bypass pipe; 4. a lower fixing bracket; 5. an upper fixing bracket;

100. a combustion assembly; 101. a combustion box; 1011. a housing; 1012. an inner case; 1013. an air inlet hole; 1014. an air outlet hole; 1015; an air cooling channel; 1016. a combustion chamber; 200. and (5) a fume collecting hood.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.

The terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

The embodiment of the utility model firstly provides a heat exchanger, as shown in fig. 1-3, the heat exchanger comprises a shell 1 and heat exchange fins 2, the heat exchange fins 2 are arranged in the shell 1, high-temperature flue gas generated by combustion enters the shell 1 and is blocked by the heat exchange fins 2 so as to facilitate heat exchange, and the shell 1 comprises a heat dissipation side wall 11. The heat exchanger further includes a heat exchange tube assembly 3, and the heat exchange tube assembly 3 includes a water inlet tube 31, a heat exchange tube 32, a water outlet tube 33, and a heat radiating tube 34. The inlet pipe 31 extends in a first plane and the outlet pipe 33 extends in a second plane, which may be parallel or at an angle to each other. For convenience of description, a coordinate system is identified in fig. 1, in this embodiment, the first plane and the second plane are parallel to each other and are parallel to planes formed by the X axis and the Y axis, and in other embodiments, the spatial positional relationship between the water inlet pipe 31 and the water outlet pipe 33 is not limited by the drawing in this embodiment. The water inlet pipe 31 is provided with a water inlet pipe water outlet 311, and the water inlet pipe 31 leads the water to be heated into the heat exchange pipe 32; the water outlet pipe 33 is provided with a water outlet pipe water inlet 331, and heated hot water flows out through the water outlet pipe 33.

The heat exchange tube 32 is arranged on the heat exchange fin 2 in a penetrating way, one end of the heat exchange tube 32 is connected with the water inlet pipe water outlet 311 of the water inlet pipe 31, and water exchanges heat with high-temperature flue gas in the heat exchange tube 32 to raise the temperature. The two ends of the radiating pipe 34 are respectively connected with the heat exchange pipe 32 and the water outlet pipe 33, the radiating pipe 34 is arranged outside the shell 1 and is attached to the radiating side wall 11, so that the temperature on the shell 1 can be greatly reduced, the color change of the shell 1 caused by the surface temperature rise is avoided, and the reliability is improved; the heat radiation pipe 34 is disposed outside the casing 1, and is not heated when water is cut off, so that the water cut-off temperature rise effect is reduced, and the water temperature in the water outlet pipe 33 is prevented from being too high when the water heater is used again.

According to the heat exchanger provided by the embodiment of the utility model, the radiating pipe 34 is attached to the radiating side wall 11 of the shell 1, the inner side of the radiating side wall 11 is close to the water outlet end of the heat exchange pipe 32 and has higher temperature rise, the radiating pipe 34 can greatly reduce the temperature of the area on the radiating side wall 11, the discoloration of the radiating side wall 11 caused by surface temperature rise is avoided, and the reliability is improved; and, the cooling tube 34 arranged outside the shell 1 can not be heated when water is stopped, so that the water stopping and temperature rising effect is reduced, and the water temperature in the water outlet tube 33 is prevented from being too high when the water heater is used again.

More specifically, the heat dissipating tube 34 includes a connection section 341 and a heat dissipating section 342, the connection section 341 is connected to the heat exchanging tube 32, the heat dissipating section 342 is connected to the water outlet pipe 33, and the heat dissipating section 342 is attached to the heat dissipating sidewall 11. Further, the heat dissipation segment 342 extends along the length direction of the heat dissipation sidewall 11, and the length of the heat dissipation segment 342 is not less than the length of the heat dissipation sidewall 11, so as to ensure the heat dissipation effect of the heat dissipation tube 34.

Preferably, as shown in fig. 2, the connection section 341 includes a bent pipe 3411, a straight pipe 3412, and a transition pipe 3413 connected in this order, and the bent pipe 3411 is connected to the heat exchange pipe 32 such that the connection section 341 extends to the outside of the housing 1. Because the bent pipe 3411 has a certain bending radius, the straight pipe 3412 bends towards the shell 1 through the transition pipe 3413, and the transition pipe 3413 is connected with the heat dissipation section 342, so that the heat dissipation section 342 is conveniently attached to the heat dissipation side wall 11 more closely. More specifically, the length of the heat dissipation side wall 11 is H, the length of the straight tube 3412 is L, and then the length of the straight tube 3412 is 25mm less than or equal to L less than or equal to 0.5H, that is, the minimum length of the straight tube 3412 is 25mm, and the maximum length of the straight tube 3412 is less than half of the length of the heat dissipation side wall 11, so that the heat dissipation section 342 can be ensured to have enough length to contact with the heat dissipation side wall 11, and the transition tube 3413 can be smoothly transited, thereby being convenient for processing.

As a preferred scheme, the heat exchange tube 32 includes a plurality of heat exchange straight tubes 321 penetrating through the heat exchange fins 2 and a plurality of heat exchange bent tubes 322 connected with the adjacent heat exchange straight tubes 321, the plurality of heat exchange straight tubes 321 are parallel to each other and are arranged at intervals, and the heat exchange bent tubes 322 are U-shaped tubes. In this embodiment, the heat exchange tube 32 includes 4 heat exchange straight pipes 321 and 3U-shaped heat exchange bent pipes 322, and the heat exchange bent pipes 322 connect adjacent heat exchange straight pipes 321 to form a circuitous waterway. Alternatively, the number of the heat exchange straight pipes 321 is even, and thus, the water inlet and the water outlet of the heat exchange pipe 32 can be formed at the same side, facilitating arrangement of the radiating pipe 34 and the water outlet pipe 33.

Preferably, the heat exchange tube assembly 3 further comprises a bypass tube 35, one end of the bypass tube 35 is connected with the water inlet tube 31, the other end is connected with the water outlet tube 33 and/or the radiating tube 34, and the bypass tube 35 is arranged outside the shell 1. The bypass pipe 35 can introduce part of cold water in the water inlet pipe 31 into the water outlet pipe 33 or the radiating pipe 34, thereby further reducing the water cut-off temperature rise. The bypass pipe 35 plays a role in reducing the water-stopping temperature rise, when water is stopped for a short time in the water-using process, the waste heat in the heat exchanger can further heat the water in the heat exchange pipe 32, no cold water enters at the moment, the temperature of the water in the heat exchange pipe 32 rises, and when the valve is opened again to use the hot water, scalding accidents can be caused due to the fact that the water temperature in the water outlet pipe 33 is too high; in this embodiment, by providing the bypass pipe 35, when the valve is opened again to use hot water, part of cold water flows into the water outlet pipe 33 through the bypass pipe 35 and is neutralized with hot water flowing out of the heat exchange pipe 32, so that scalding caused by overhigh water temperature is avoided. Optionally, the inner diameter of the bypass pipe 35 is not greater than 6mm, avoiding that too much cold water does not pass the heat exchange fins 2 to reduce the heat exchange efficiency. It should be noted that, when the water outlet end of the bypass pipe 35 is simultaneously connected to the water outlet pipe 33 and the heat dissipating pipe 34, the bypass pipe 35 may be a three-way pipe.

The embodiment of the utility model further provides a gas water heater, as shown in fig. 4-6, the gas water heater comprises the heat exchanger, the gas water heater further comprises a combustion assembly 100, the combustion assembly 100 comprises a combustion box 101 connected to the shell 1, the combustion box 101 is provided with an air cooling channel 1015 and a combustion chamber 1016, and the air cooling channel 1015 is communicated with the combustion chamber 1016. The air cooling passage 1015 can provide enough air cooling for the combustion box 101 to avoid discoloration or damage of the combustion box 101 due to overheating.

The water inlet pipe 31 and the water outlet pipe 33 extend in a plane, are not coiled outside the combustion box body 101 any more, the complex and long pipe winding is eliminated, the water path is shorter, the flow resistance of water can be reduced, the water flow of the whole machine is improved, the use of copper materials is reduced, and the arrow in fig. 1 indicates the flow direction of the water. The radiating tube 34 radiates heat and cools the outer surface of the shell 1, so that the effects of discoloration and water cut-off and temperature rise caused by temperature rise are avoided, and the gas water heater has reliability and low cost.

Preferably, the inlet pipe 31 and the outlet pipe 33 of the heat exchanger extend to the outside of the combustion box 101. More specifically, due to the rising effect of the high temperature flue gas, the combustion box 101 is disposed below the housing 1, and the water inlet pipe 31 and the water outlet pipe 33 extend to the lower side of the combustion box 101, so that water inlet and water outlet are conveniently realized from the lower side of the gas water heater, as shown in fig. 5, and the use is convenient.

Preferably, the combustion case 101 includes an outer shell 1011 and an inner shell 1012, the outer shell 1011 is sleeved outside the inner shell 1012, an air cooling channel 1015 is formed between the outer shell 1011 and the inner shell 1012 at intervals, an air inlet 1013 is provided on the upper side of the outer shell 1011, an air outlet 1014 is provided on the lower side of the inner shell 1012, the air inlet 1013 communicates with the air cooling channel 1015, and the air cooling channel 1015 communicates with the combustion chamber 1016 of the combustion case 101 through the air outlet 1014. It will be appreciated that the outside air enters the air cooling passage 1015 from the outer housing 1011 and then enters the combustion chamber 1016 within the combustion box 101 through the air outlet 1014 of the inner housing 1012, as shown by the arrows in fig. 6, to cool the combustion box 101 during the air flow process, thereby replacing the coiled water pipe of the prior art to cool the combustion box 101. More specifically, the air inlet 1013 is provided at the upper side of the outer case 1011, the air outlet 1014 is provided at the lower side of the inner case 1012, and the cool air can cool the combustion case 101 from the top down, so that the overall temperature of the combustion case 101 is reduced, and even if the cooling effect due to the coiled water pipe is not provided, the overheating discoloration of the combustion case 101 can be avoided.

Preferably, the material of the combustion box 101 is an aluminum plating plate or a galvanized plate or a stainless steel plate. The aluminum plating plate, the galvanized plate and the stainless steel plate have excellent heat insulation performance and cannot generate high-temperature discoloration. In addition, the price of the aluminum plating plate, the galvanized plate and the stainless steel plate is lower than that of the oxygen-free copper, and the processing cost of the gas water heater is greatly reduced.

Optionally, the heat exchanger further comprises a lower fixing bracket 4, and the lower fixing bracket 4 is detachably connected between the housing 1 and the combustion box 101. More specifically, the upper end of the casing 1 and the combustion box 101 are provided with outward turned flange edges which are assembled with the lower fixing support 4 respectively, and the connecting structure increases the connection reliability between the casing 1 and the combustion box 101, improves the sealing performance, further improves the sealing performance of the whole combustion system, improves the whole machine suction, stabilizes the combustion working condition in the combustion box 101 and improves the smoke components.

As a preferred scheme, the gas water heater further comprises a fume collecting hood 200, the heat exchanger further comprises an upper fixing support 5, the upper fixing support 5 is detachably connected between the casing 1 and the fume collecting hood 200, and after heat exchange of the heat exchanger, high-temperature fume is collected by the fume collecting hood 200 and discharged out of the gas water heater. More specifically, the lower end of the housing 1 and the fume collecting hood 200 are provided with outward turned flange edges which are assembled with the upper fixing support 5 respectively, and the connecting structure increases the connection reliability between the housing 1 and the fume collecting hood 200, improves the sealing performance and avoids the fume from overflowing.

In the specific content of the above embodiment, any combination of the technical features may be performed without contradiction, and for brevity of description, all possible combinations of the technical features are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing detailed description of the embodiments presents only a few embodiments of the present utility model, which are described in some detail and are not intended to limit the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. A heat exchanger, comprising:

a housing (1) and heat exchange fins (2) arranged in the housing (1), wherein the housing (1) comprises a heat radiation side wall (11);

a heat exchange tube assembly (3), the heat exchange tube assembly (3) comprising:

a water inlet pipe (31) and a water outlet pipe (33), the water inlet pipe (31) extending in a first plane, the water outlet pipe (33) extending in a second plane;

the heat exchange tube (32) is arranged on the heat exchange fin (2) in a penetrating way, and the water inlet end of the heat exchange tube (32) is connected with the water inlet tube (31);

the heat exchange device comprises a heat exchange tube (32), a heat dissipation tube (34), a water outlet end of the heat exchange tube (32) and a water outlet pipe (33) are respectively connected to two ends of the heat dissipation tube (34), and the heat dissipation tube (34) is arranged outside the shell (1) and is attached to the heat dissipation side wall (11).

2. The heat exchanger according to claim 1, wherein the radiating pipe (34) comprises a connecting section (341) and a radiating section (342), the connecting section (341) is connected with the heat exchanging pipe (32), the radiating section (342) is connected with the water outlet pipe (33), and the radiating section (342) is attached to the radiating side wall (11).

3. The heat exchanger according to claim 2, wherein the connection section (341) comprises an elbow (3411), a straight pipe (3412) and a transition pipe (3413) connected in sequence, the elbow (3411) being connected to the heat exchange pipe (32), the transition pipe (3413) being bent from the straight pipe (3412) in the direction of the housing (1), the transition pipe (3413) being connected to the heat dissipation section (342).

4. A heat exchanger according to claim 3, wherein the heat radiation side wall (11) has a length H and the straight tube (3412) has a length L, and the length L is 25 mm.ltoreq.l.ltoreq.0.5H.

5. The heat exchanger according to claim 2, wherein the heat dissipating section (342) extends in a length direction of the heat dissipating side wall (11).

6. The heat exchanger according to claim 1, wherein the heat exchange tube (32) comprises a heat exchange straight tube (321) and a heat exchange bent tube (322), a plurality of heat exchange straight tubes (321) are arranged in the shell (1) in a penetrating manner, the plurality of heat exchange straight tubes (321) are arranged in parallel and at intervals, and two adjacent heat exchange straight tubes (321) are connected through the heat exchange bent tube (322).

7. A heat exchanger according to any one of claims 1-6, wherein the heat exchanger tube assembly (3) further comprises a bypass tube (35), one end of the bypass tube (35) being connected to the inlet tube (31) and the other end being connected to the heat dissipating tube (34) and/or the outlet tube (33), the bypass tube (35) being arranged outside the housing (1).

8. Gas water heater, comprising a heat exchanger according to any of claims 1-7, and a combustion assembly (100), said combustion assembly (100) comprising a combustion box (101) connected to said housing (1), said combustion box (101) being formed with an air-cooled channel (1015) and a combustion chamber (1016), said air-cooled channel (1015) being in communication with said combustion chamber (1016).

9. The gas water heater according to claim 8, wherein the combustion box (101) comprises an outer shell (1011) and an inner shell (1012), the outer shell (1011) is sleeved outside the inner shell (1012), the air cooling channel (1015) is formed between the outer shell (1011) and the inner shell (1012), an air inlet hole (1013) is formed in the upper side of the outer shell (1011), an air outlet hole (1014) is formed in the lower side of the inner shell (1012), the air inlet hole (1013) is communicated with the air cooling channel (1015), and the air cooling channel (1015) is communicated with the combustion chamber (1016) through the air outlet hole (1014).

10. The gas water heater according to claim 8, further comprising a fume collection hood (200), the heat exchanger further comprising an upper fixing bracket (5), the upper fixing bracket (5) being detachably connected between the housing (1) and the fume collection hood (200); and/or, the heat exchanger further comprises a lower fixing bracket (4), and the lower fixing bracket (4) is detachably connected between the shell (1) and the combustion box body (101).

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