Combustion chamber shell and combustion heat exchange device

Abstract

This utility model discloses a combustion chamber shell and a combustion heat exchange device, relating to the field of combustion heat exchange technology. The combustion chamber shell includes an outer shell and heat insulation plates; the outer shell has four side walls, and four heat insulation plates are arranged correspondingly to the four side walls, with the thermal conductivity of the heat insulation plates being lower than that of the outer shell. A cooling channel is formed between each heat insulation plate and its corresponding side wall. An air inlet communicating with the cooling channel is provided at the lower part of the side wall, and an air outlet communicating with the cooling channel is provided at the upper part of the heat insulation plate. External cold air enters the cooling channel from the lower part of the side wall and flows upwards, allowing the external cold air to fully contact and exchange heat with the four side walls. The higher-temperature gas formed after the cold air absorbs heat enters the combustion chamber from the upper part of the heat insulation plate. The cooling channel formed by this combustion chamber shell has a simple structure, reduces manufacturing costs, and improves the heat dissipation and cooling effect of the combustion chamber shell.

Description

Technical Field

[0001] This utility model relates to the field of combustion heat exchange technology, and in particular to a combustion chamber shell and a combustion heat exchange device. Background Technology

[0002] Some existing water heaters use air cooling to dissipate heat from the combustion chamber shell. However, due to the high thermal conductivity of their double-layer shell structure, the heat dissipation and cooling effect is very limited. Some combustion chamber shells isolate the high-temperature flame inside the combustion chamber by setting heat insulation plates on the side wall of the combustion chamber to protect the combustion chamber shell from direct burning. However, with this insulation method, the high-temperature heat inside the combustion chamber can still be easily transferred to the outer shell of the combustion chamber through the heat insulation plates. If a good cooling effect is to be achieved on the outer shell of the combustion chamber, a complex flow channel structure is required, such as the double-layer flow channel structure in CN202110600539.0. Due to the complexity of the structure, the production process cost is high, making it difficult to promote and apply. Utility Model Content

[0003] The first technical problem solved by this utility model is to provide a combustion chamber shell that can improve the heat dissipation and cooling effect of the combustion chamber shell while effectively controlling costs.

[0004] The second technical problem solved by this utility model is to provide a combustion heat exchange device that can effectively solve the problems of high cost and poor heat dissipation of existing combustion heat exchange devices; it achieves the goal of reducing the cost of the combustion heat exchange device while improving the heat dissipation and cooling effect of the combustion chamber shell.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] Combustion chamber housing, comprising:

[0007] The housing has four side walls;

[0008] Four heat insulation panels are provided, each corresponding to one of the four side walls, and the thermal conductivity of the heat insulation panels is lower than that of the outer shell.

[0009] In this configuration, a cooling channel is formed between each heat insulation plate and its corresponding sidewall. The lower part of the sidewall is provided with an air inlet communicating with the cooling channel, and the upper part of the heat insulation plate is provided with an air outlet communicating with the cooling channel.

[0010] The combustion chamber shell of this utility model has the following advantages compared with the prior art:

[0011] The combustion chamber shell provided by this utility model includes an outer shell and heat insulation plates. The heat insulation plates, with a thermal conductivity lower than that of the outer shell, are positioned one-to-one with the four side walls of the outer shell, providing thermal insulation for the outer shell. Simultaneously, a cooling channel is formed between each heat insulation plate and its corresponding side wall. External cold air enters the cooling channel from the lower part of the side wall and flows upwards, allowing for sufficient contact and heat exchange between the external cold air and the four side walls. The higher-temperature gas formed after the cold air absorbs heat enters the combustion chamber from the upper part of the heat insulation plate. This combustion chamber shell's cooling channel structure is simple, reducing manufacturing costs while improving the heat dissipation and cooling effect of the combustion chamber shell.

[0012] In one embodiment, a groove is provided on the sidewall, and the cooling channel is formed between the heat insulation plate and the bottom of the groove.

[0013] In one embodiment, a support boss is provided on the groove, the height of the support boss being greater than the depth of the groove, and the end wall of the support boss abutting against the heat insulation plate, so that a gap space is formed between the heat insulation plate and the four periphery of the groove.

[0014] In one embodiment, the sidewall protrudes to form a bulge, and the groove is formed within the bulge.

[0015] In one embodiment, the height of the convex hull is H1, and the gap of the interval space is H2, where H1 = 5H2 ~ 8H2.

[0016] In one embodiment, the insulation panel comprises an aluminum carbonate fiberboard.

[0017] In one embodiment, limiting plates are provided on both the upper and lower sides of the sidewall, and a snap-fit ​​interval is formed between the limiting plates and the sidewall, with the upper and lower ends of the heat insulation plate confined within the snap-fit ​​interval.

[0018] In one embodiment, the total air outlet area of ​​the air outlets located on the same side is S1, and the total air inlet area of ​​the air inlets is S2, where 2S2 < S1 < 4S2.

[0019] In one embodiment, the thickness of the insulation board is T, where 10mm ≤ T ≤ 20mm.

[0020] The second technical problem mentioned above is solved by the following technical solution:

[0021] A combustion heat exchange device, comprising a heat exchanger and a combustion chamber shell as described in any of the above embodiments, wherein the heat exchanger is sandwiched between the heat insulation plates.

[0022] The combustion heat exchange device described in this utility model has the following advantages compared with the prior art:

[0023] The combustion heat exchange device provided by this utility model utilizes the aforementioned combustion chamber shell. The cooling channel of the combustion chamber shell has a simple structure and is easy to process, which reduces production costs while improving the cooling effect of the outer shell of the combustion chamber. Furthermore, the heat exchanger is sandwiched between the insulation plates, which not only prevents the side leakage of high-temperature gas in the combustion chamber, but also allows the heat exchanger to directly contact the insulation plates for heat exchange. At the same time, the high-temperature gas flowing out through the cooling channel flows out through the outlet and directly exchanges heat with the heat exchanger, further improving the heat exchange efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is an exploded view of the combustion heat exchange device provided in a specific embodiment of this utility model;

[0026] Figure 2 This is a first longitudinal section schematic diagram of the combustion chamber shell provided in a specific embodiment of the present utility model;

[0027] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0028] Figure 4 This is a second longitudinal section schematic diagram of the combustion chamber shell provided in a specific embodiment of the present invention;

[0029] Figure 5 This is an exploded view of the outer shell and heat insulation plate provided in a specific embodiment of this utility model;

[0030] Figure 6 This is a cross-sectional view of the combustion heat exchange device provided in a specific embodiment of this utility model.

[0031] In the picture:

[0032] 1. Outer shell; 11. U-shaped surround; 12. Front cover;

[0033] 101. Cooling channel; 102. Support boss; 103. Air inlet; 104. L-shaped flange; 1041. Horizontal edge; 1042. Vertical edge; 105. L-shaped connecting bracket; 106. Protrusion;

[0034] 2. Insulation panel; 21. Front partition; 22. Left partition; 23. Rear partition; 24. Right partition;

[0035] 201. Combustion chamber; 202. Air outlet; 203. Interval space;

[0036] 3. Limiting plate; 31. Lateral limiting plate; 32. Longitudinal limiting plate; 33. Connecting plate;

[0037] 4. Combustion system assembly;

[0038] 5. Heat exchanger;

[0039] 6. Fan system assembly. Detailed Implementation

[0040] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0041] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] like Figure 1 As shown, this embodiment provides a combustion heat exchange device, including a combustion chamber assembly, a combustion system assembly 4, a heat exchanger 5, and a fan system assembly 6. The combustion chamber assembly includes a combustion chamber shell, within which a combustion chamber 201 is formed. The combustion system assembly 4 is located at the lower end of the combustion chamber 201, and the heat exchanger 5 is connected to the upper end of the combustion chamber 201. The fan system assembly 6 is located above the heat exchanger 5. The fan system assembly 6 is connected to the combustion chamber assembly via a duct. The high-temperature flue gas generated by combustion in the combustion system assembly 4 enters the heat exchanger 5 through the combustion chamber 201 for heat exchange and is then discharged through the fan system assembly 6.

[0043] The large amount of heat generated by fuel combustion in the combustion system assembly 4 will cause the surface temperature of the combustion chamber shell to become too high. With prolonged use, the combustion chamber shell may be burned through or the external components of the combustion chamber shell may be damaged by high temperature.

[0044] To solve the above technical problems, such as Figures 2-4As shown, the combustion chamber shell provided in this embodiment includes an outer shell 1 and heat insulation plates 2. The outer shell 1 has four side walls, and the four heat insulation plates 2 are arranged corresponding to the four side walls one by one. The thermal conductivity of the heat insulation plates 2 is lower than that of the outer shell 1. A cooling channel 101 is formed between each heat insulation plate 2 and its corresponding side wall. An air inlet 103 communicating with the cooling channel 101 is provided at the lower part of the side wall, and an air outlet 202 communicating with the cooling channel 101 is provided at the upper part of the heat insulation plate 2.

[0045] A combustion chamber 201 is formed inside the outer shell 1. Heat insulation plates 2, with a thermal conductivity lower than that of the outer shell 1, are correspondingly placed on the four side walls of the outer shell 1, providing insulation. Simultaneously, a cooling channel 101 is formed between each heat insulation plate 2 and its corresponding side wall. External cold air enters the cooling channel 101 from the lower part of the side wall and flows upwards, allowing for sufficient contact and heat exchange between the external cold air and the four side walls. The higher-temperature gas formed after the cold air absorbs heat enters the combustion chamber 201 from the upper part of the heat insulation plate 2. This cooling channel 101 formed in the combustion chamber shell has a simple structure, reducing manufacturing costs while improving the heat dissipation and cooling effect of the combustion chamber shell.

[0046] Specifically, the outer shell 1 is made of a heat-reflective insulating material such as aluminized sheet, galvanized sheet, or stainless steel sheet. By using aluminized sheet, galvanized sheet, or stainless steel sheet as the material of the outer shell 1, the high heat reflectivity of its surface metal coating can effectively block the heat radiation from inside the combustion chamber shell from being transmitted outward. While reflecting most of the heat radiation, the low thermal conductivity of the metal substrate itself slows down heat conduction. This dual effect significantly reduces the surface temperature of the outer shell 1, thereby preventing high temperatures from causing thermal deformation or aging of temperature-sensitive components such as electronic components and seals on the outside of the combustion chamber shell. This extends the service life and reduces maintenance needs caused by high-temperature failures, improving safety while reducing operating costs.

[0047] In one embodiment, the heat insulation board 2 is an aluminum carbonate fiberboard. Using aluminum carbonate fiberboard as the heat insulation layer, its dense internal fiber structure effectively blocks heat transfer, and the porous structure between the fibers significantly slows down heat conduction and convection. Simultaneously, the high melting point and low thermal conductivity of aluminum carbonate allow it to withstand high-temperature environments for extended periods. This dual heat insulation mechanism significantly reduces the heat penetration rate to the outside of the outer shell 1, thereby protecting adjacent electronic components and mechanical structures from high-temperature softening or deformation. It avoids the secondary heat radiation problem caused by heat conduction in traditional metal heat insulation boards 2, and also reduces the overall weight through its lightweight characteristics. This improves thermal energy utilization while extending service life, combining safety and economy.

[0048] Of course, in other embodiments, the insulation board 2 can also be made of other materials with low thermal conductivity, such as glass wool.

[0049] In one embodiment, the thickness of the insulation board 2 is T, where 10mm ≤ T ≤ 20mm. The thicker the insulation board 2, the better the heat insulation and noise reduction effects. Increased thickness firstly lengthens the heat penetration path, forcing heat conduction to overcome the obstacles of internal fibers or pores in the material layer by layer. Simultaneously, the thicker porous structure can capture more air layers, further blocking heat convection due to the low thermal conductivity of air. Regarding noise reduction, increased thickness forces sound waves to penetrate more damping layers, and the frictional energy dissipation effect of the micropores within the material on low- and mid-frequency sound waves is significantly enhanced, thereby simultaneously suppressing the mechanical vibration noise of the fan system assembly 6 during operation. By limiting the thickness of the insulation board 2 to greater than or equal to 10mm and less than or equal to 20mm, the thickness of the insulation board 2 can be selected according to actual space requirements and cost while ensuring noise reduction and heat insulation effects.

[0050] In one embodiment, a groove is provided on the side wall, and a cooling channel 101 is formed between the heat insulation plate 2 and the bottom of the groove. By providing a groove on the side wall of the outer casing 1 to form a cooling channel 101, no other parts need to be added, saving assembly steps, simplifying the structure, and reducing processing costs.

[0051] Specifically, the air inlet 103 is located at the bottom of the groove, allowing external cold air to flow vertically towards the heat insulation plate 2. After being blocked by the heat insulation plate 2, the air flows upward along the cooling channel 101, increasing the residence time of the external cold air in the cooling channel 101 and enabling it to fully contact and exchange heat with the side wall of the outer shell 1. The heated air then enters the combustion chamber 201 through the air outlet 202 at the top of the heat insulation plate 2. This directional airflow design is particularly suitable for compact enclosed spaces, as it can control the temperature rise of the outer shell 1 within a safe threshold and reduce the amount of cooling air required, thereby reducing the speed of the fan system assembly 6 and achieving better noise reduction.

[0052] In one embodiment, a support boss 102 is provided on the groove. The height of the support boss 102 is greater than the depth of the groove, and the end wall of the support boss 102 abuts against the heat insulation plate 2, so that a gap space 203 is formed between the heat insulation plate 2 and the four peripheral edges of the groove. By providing the support boss 102 to support the heat insulation plate 2, the height of the support boss 102 limits the distance between the bottom of the groove and the heat insulation plate 2. Furthermore, the gap space 203 between the heat insulation plate 2 and the four peripheral edges of the groove can prevent the heat of the heat insulation plate 2 from being directly transferred to the outer shell 1, thereby reducing the temperature rise rate of the outer shell 1.

[0053] In one embodiment, the sidewall protrudes outward to form a convex bulge 106, and a groove is formed within the convex bulge 106. The groove is formed by molding the sidewall, which simplifies the processing steps and ensures high precision.

[0054] Specifically, the support boss 102 is configured as a frustum. Since the support boss 102 is located within the cooling channel 101, when external cold air enters the cooling channel 101, the inclined surface guides the airflow to a gentle turn as it flows past the sidewall of the frustum, avoiding turbulent separation and vortex generation caused by right angles or vertical surfaces, thereby reducing local pressure loss and improving airflow efficiency. This streamlined design also allows the cold air to adhere closely to the surface of the frustum, forming a laminar boundary layer, increasing the effective contact area with the inner wall of the cavity, thus accelerating the transfer of heat from the outer shell 1 to the cold air. Furthermore, the planar structure at the top of the frustum can still stably support the positioned heat insulation plate 2, balancing mechanical strength and flow field uniformity.

[0055] In this embodiment, the frustum is molded inward from the side wall of the outer shell 1, eliminating the need for other components and reducing assembly steps. Several frustums are spaced apart within the groove to ensure the stability of the support for the heat insulation plate 2.

[0056] In one embodiment, continue to refer to Figure 3 The height of the convex bulge 106 is H1, and the gap of the space 203 is H2, where H1 = 5H2 to 8H2. The higher the height of the convex bulge 106, the larger the volume of the cooling channel 101, which can accommodate more cooling air and extend its flow path, so that the heat dissipation contact area increases linearly with depth. At the same time, the residence time of the cooling air is extended, allowing for full absorption of heat. Meanwhile, the smaller volume of the space 203 forms a dense thermal resistance layer, which can both block the heat radiation penetration of the heat insulation plate 2 and avoid the increase in the volume of the combustion chamber shell due to excessive depth.

[0057] In this embodiment, the height H1 of the convex hull 106 is set to 3mm to 4mm, and the gap H2 of the spacing space 203 is set to 0.5mm to 1mm.

[0058] Specifically, such as Figure 5 As shown, the outer shell 1 includes a U-shaped enclosure 11 and a front cover 12. The heat insulation plate 2 includes a front partition 21, a left partition 22, a rear partition 23 and a right partition 24. During assembly, the left partition 22, the rear partition 23 and the right partition 24 are sequentially installed on the three side walls of the U-shaped enclosure 11. Then, the front partition 21 is installed on the front cover 12. The front cover 12 and the U-shaped enclosure 11 are then fixedly connected by fastening screws. The front partition 21, the left partition 22, the rear partition 23 and the right partition 24 enclose and form a combustion chamber 201.

[0059] The three side walls of the U-shaped enclosure 11 and the front cover plate 12 are provided with protruding protrusions 106, that is, the four side walls of the outer shell 1 are all formed with cooling channels 101, and each groove is provided with a support protrusion 102. The support protrusions 102 on the three side walls of the U-shaped enclosure 11 cooperate with the left partition 22, the rear partition 23 and the right partition 24 respectively to form three space intervals 203. The support protrusions 102 on the front cover plate 12 cooperate with the front partition 21 to form a space interval 203 in the circumference of the cooling channel 101.

[0060] Several air inlets 103 are provided at the lower part of the three side walls of the U-shaped enclosure 11 and at the bottom of the groove of the lower part of the front cover plate 12. In this embodiment, the diameter of the air inlets 103 is 3mm to 4mm. Four to five air inlets 103 are provided on each of the three side walls of the U-shaped enclosure 11, and nine to ten air inlets 103 are provided on the front cover plate 12. Air outlets 202 are provided on the upper part of the front partition plate 21, left partition plate 22, rear partition plate 23 and right partition plate 24. The air outlets 202 are rectangular strips.

[0061] In one embodiment, the total air outlet area of ​​the air outlets 202 located on the same side is S1, and the total air inlet area of ​​the air inlets 103 is S2, where 2S2 < S1 < 4S2. Preferably, S1 = 3S2. The area of ​​the rectangular slots on the front partition 21, left partition 22, rear partition 23, and right partition 24 is designed based on the total area of ​​all air inlets 103 on their respective corresponding sidewalls of the outer casing 1. By setting the area of ​​the air outlet 202 to three times the area of ​​all the air inlets 103, when external cold air enters the cooling channel 101 from the smaller area air inlet 103 at a speed of V1, the flow rate automatically drops to V1 / 3 at the air outlet 202 because the cross-sectional area is expanded to three times. At this time, the reduced flow rate prolongs the residence time of the external cold air in the cavity, thus achieving full absorption of more heat. At the same time, the expansion of the diameter of the air outlet 202 significantly reduces the flow resistance, promotes smoother air intake, and further reduces the amount of cold air required for the cooling channel 101. The fan system assembly 6 required for the cooling channel 101 has a lower rotation speed, and the air provided by the fan system assembly 6 can be used more for fuel combustion in the combustion system assembly 4, resulting in better combustion performance and lower noise.

[0062] In one embodiment, when the distance between the combustion system assembly 4 and the inner wall of the combustion chamber 201 is greater than or equal to a set distance, the area of ​​the air inlet 103 is S2; when the distance between the combustion system assembly 4 and the inner wall of the combustion chamber 201 is less than the set distance, the area of ​​the air inlet 103 is S2ˊ, and S2<S2ˊ. When the distance between the combustion system assembly 4 and the inner wall of the combustion chamber 201 is larger, the heat generated by fuel combustion in the combustion system assembly 4 is conducted to the heat insulation plate 2 more slowly, and less external cold air is required to cool the flow channel 101. Therefore, the number of air inlets 103 can be appropriately reduced, thereby reducing the amount of external cold air intake, reducing the speed of the fan system assembly 6, and achieving better noise reduction.

[0063] In this embodiment, the distance is set to 15mm to 20mm.

[0064] In one embodiment, such as Figure 4 As shown, limiting plates 3 are provided on both the upper and lower sides of the sidewall, forming a snap-fit ​​gap between the limiting plates 3 and the sidewall, and the upper and lower ends of the heat insulation plate 2 are limited within the snap-fit ​​gap. The limiting plates 3 are designed with an L-shaped structure, and the heat insulation plate 2 is fixed by the support boss 102 on the outer shell 1 and the L-shaped limiting plates 3 at the upper and lower ends. The structure is simple, has good stability, and is easy to disassemble and assemble.

[0065] Specifically, a limiting plate 3 is provided on the upper side of the side wall. The limiting plate 3 includes a transverse limiting plate 31 and a longitudinal limiting plate 32. The transverse limiting plate 31 abuts against the upper end face of the heat insulation plate 2, and the longitudinal limiting plate 32 abuts against the upper end of the inner wall of the heat insulation plate 2. An inwardly bent L-shaped flange 104 is provided on the lower side of the side wall. The L-shaped flange 104 is integrally formed with the outer shell 1 to form the limiting plate 3. The horizontal edge 1041 of the L-shaped flange 104 abuts against the lower end face of the heat insulation plate 2, and the vertical edge 1042 of the L-shaped flange 104 abuts against the lower end of the inner wall of the heat insulation plate 2.

[0066] In this embodiment, the upper parts of the inner walls of the U-shaped enclosure 11 and the front cover 12 are connected to the limiting plate 3 by fastening screws. The limiting plate 3 also includes a connecting plate 33, which is vertically connected to the end of the transverse limiting plate 31 away from the longitudinal limiting plate 32 and located on the side of the transverse limiting plate 31 opposite to the longitudinal limiting plate 32. The connecting plate 33 is detachably connected to the side wall of the outer shell 1. At the bottom of the outer shell 1, an L-shaped flange 104 integrally formed with the side wall of the outer shell 1 serves as the limiting plate 3. During assembly, the heat insulation plate 2 is first placed inside the L-shaped flange 104, and then the limiting plate 3 is connected to the upper part of the inner wall of the outer shell 1, which facilitates the assembly and disassembly of the heat insulation plate 2.

[0067] In one embodiment, such as Figure 5 and Figure 6As shown, the heat exchanger 5 is sandwiched between the heat insulation plates 2. Specifically, the tops of the left partition 22 and the right partition 24 are lower than the tops of the front partition 21 and the rear partition 23. The heat exchanger 5 is placed above the left partition 22 and the right partition 24, with its front and rear sides sandwiched between the front partition 21 and the rear partition 23. The four heat insulation plates 2 hold the heat exchanger 5, which not only prevents the high-temperature gas in the combustion chamber 201 from leaking out, but also allows the heat exchanger 5 to directly contact the heat insulation plates 2 for heat exchange. At the same time, the higher-temperature gas flowing out of the cooling channel 101 flows out through the outlet 202 and directly exchanges heat with the heat exchanger 5, further improving the heat exchange efficiency.

[0068] Furthermore, both the left and right side walls of the U-shaped enclosure 11 are provided with L-shaped connecting brackets 105 extending outward from the top of the side wall, and the heat exchanger 5 is fixed to the top of the outer shell 1 through the two L-shaped connecting brackets 105. The top of the side wall corresponding to the front cover 12 and the U-shaped enclosure 11 is higher than the left and right side walls of the U-shaped enclosure 11. The accommodating space formed by the higher part of the top of the front cover 12 and the side wall corresponding to the front cover 12 is used to accommodate the heat exchanger 5, and the fan system assembly 6 is connected to the top of the heat exchanger 5.

[0069] This embodiment also provides a combustion heat exchange device that uses the combustion chamber shell described above. The cooling channel 101 of the combustion chamber shell has a simple structure and is easy to process, which reduces production costs while improving the cooling effect of the outer shell 1 of the combustion chamber shell. The heat exchanger 5 is sandwiched between the heat insulation plates 2, which not only prevents the high-temperature gas in the combustion chamber 201 from leaking, but also allows the heat exchanger 5 to directly contact the heat insulation plate 2 for heat exchange. At the same time, the high-temperature gas flowing out through the cooling channel 101 flows out through the outlet 202 and directly exchanges heat with the heat exchanger 5, further improving the heat exchange efficiency.

[0070] The combustion heat exchange device provided in this embodiment can be applied to gas appliances such as gas water heaters.

[0071] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A combustion chamber housing, characterized by, include: The outer casing (1) has four side walls; Four heat insulation plates (2) are provided, and the four heat insulation plates (2) are provided in a one-to-one correspondence with the four side walls, and the thermal conductivity of the heat insulation plates (2) is lower than that of the outer shell (1); In this configuration, a cooling channel (101) is formed between each heat insulation plate (2) and its corresponding side wall. The lower part of the side wall is provided with an air inlet (103) communicating with the cooling channel (101), and the upper part of the heat insulation plate (2) is provided with an air outlet (202) communicating with the cooling channel (101).

2. The combustion chamber housing of claim 1, wherein, A groove is provided on the side wall, and the cooling channel (101) is formed between the heat insulation plate (2) and the bottom of the groove.

3. The combustion chamber housing of claim 2, wherein, A support boss (102) is provided on the groove. The height of the support boss (102) is greater than the depth of the groove. The end wall of the support boss (102) abuts against the heat insulation plate (2) so that a gap space (203) is formed between the heat insulation plate (2) and the four periphery of the groove.

4. The combustion chamber housing of claim 3, wherein, The sidewall protrudes outward to form a convex bulge (106), and the groove is formed inside the convex bulge (106).

5. The combustion chamber housing of claim 4, wherein, The height of the convex hull (106) is H1, and the gap of the interval space (203) is H2, where H1 = 5H2 ~ 8H2.

6. The combustion chamber housing of claim 1, wherein, The heat insulation board (2) is an aluminum carbonate fiberboard.

7. The combustion chamber housing of claim 1, wherein, Limiting plates (3) are provided on both the upper and lower sides of the sidewall, and a snap-fit ​​interval is formed between the limiting plates (3) and the sidewall. The upper and lower ends of the heat insulation plate (2) are limited to the snap-fit ​​interval.

8. The combustion chamber housing according to any one of claims 1 to 7, characterized in that The total air outlet area of ​​the air outlet (202) located on the same side is S1, and the total air inlet area of ​​the air inlet (103) is S2, where 2S2 < S1 < 4S2.

9. A combustion chamber housing according to any one of claims 1-7, characterized in that The thickness of the heat insulation board (2) is T, 10mm≤T≤20mm.

10. A combustion heat exchange device characterized by It includes a heat exchanger (5) and a combustion chamber shell as described in any one of claims 1-9, wherein the heat exchanger (5) is sandwiched between the heat insulation plates (2).

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