Combustion furnace and water heater
By setting the flame reflection surface and heat insulation chamber in the combustion furnace, the powdering and odor problems of aluminum silicate cotton insulation board are solved, and better insulation effect and heat utilization are achieved.
Patent Information
- Application Number
- CN202422136623.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-30
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-08-30
AI Technical Summary
In existing gas heating hot water furnaces/water heaters, aluminum silicate cotton insulation boards are powdered and burned at high temperatures to produce odors, resulting in heat loss and smoke problems.
The inner surface of the heat insulation shell is set as a flame reflection surface, and the heat insulation shell made of 430 stainless steel and other materials is formed to form a combustion chamber, and a heat insulation cavity is set between the heat insulation shell and the shell to reduce heat loss through flame reflection and air flow channel.
It improves heat insulation effect, reduces heat loss and odor generation, and improves the thermal efficiency and safety of the combustion furnace.
Smart Images
Figure CN223153777U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of combustion furnaces, and particularly relates to a combustion furnace and a water heater. Background Art
[0002] In the combustion chamber of an existing gas heating water heater / water heater, natural gas or liquefied gas is burned, and the generated heat is used for gas-water heat exchange to heat the hot water medium. At the same time, an aluminosilicate cotton heat insulation board is used for heat insulation to prevent heat dissipation. However, the long-term use of the heat insulation board made of aluminosilicate heat insulation material will cause the aluminosilicate cotton to powder and be damaged. Moreover, due to the high temperature in the combustion chamber, the binder in the aluminosilicate cotton will burn, resulting in serious smoke and peculiar smell. Content of the Utility Model
[0003] The main purpose of the utility model is to propose a combustion furnace and a water heater, aiming to improve the problems of powdering and burning with peculiar smell existing in the use of aluminosilicate cotton as a heat insulation board in the prior art.
[0004] To achieve the above object, a combustion furnace proposed by the utility model includes:
[0005] A heat insulation shell, a combustion chamber is arranged inside the heat insulation shell, and at least part of the inner surface of the heat insulation shell is set as a flame reflection surface; and
[0006] A burner, at least part of the burner is arranged inside the combustion chamber.
[0007] In one embodiment, the inner surface of the heat insulation shell is all set as a flame reflection surface;
[0008] And / or, the material of the heat insulation shell is 430 stainless steel.
[0009] In one embodiment, the heat insulation shell includes at least two heat insulation plates, and at least two heat insulation plates are connected and enclosed to form the combustion chamber;
[0010] And / or, the heat insulation shell is provided with at least two openings, and the combustion port of the burner extends into the combustion chamber from one of the openings;
[0011] And / or, the burner is detachably connected to the heat insulation shell.
[0012] The combustion furnace further includes a shell, the heat insulation shell and the burner are arranged inside the shell, the shell is spaced from the heat insulation shell, and the space between the shell and the heat insulation shell is set as a heat insulation cavity.
[0013] In one embodiment, the heat insulation plate of the heat insulation shell has at least a first edge and a second edge. Both the first edge and the second edge extend away from the combustion chamber. The first edge is located at one end of the heat insulation plate away from the burner, and the second edge is located at one end of the heat insulation plate close to the burner. The heat insulation plate is connected to the shell through the first edge and the second edge. The heat insulation plate, the first edge, the second edge, and the shell enclose to form the heat insulation cavity.
[0014] In one embodiment, the second edge includes a first connecting section and a second connecting section connected to each other. The first connecting section extends away from the combustion chamber. The second connecting section is arranged at one end of the first connecting section away from the heat insulation plate, and the second connecting section is arranged along the extending direction of the heat insulation plate.
[0015] In one embodiment, a first air inlet and a second air outlet for air to enter and exit are formed on the shell. An air flow channel is formed between the first air inlet and the second air outlet. The combustion chamber and the heat insulation cavity are arranged in the air flow channel, and the combustion chamber is communicated with the air flow channel.
[0016] In one embodiment, a first communication hole is formed at a position of the heat insulation plate close to the first edge;
[0017] The first connecting section of the second edge is provided with a second communication hole along its own length direction. The heat insulation cavity is communicated with the air flow channel and the combustion chamber respectively through the first communication hole and the second communication hole.
[0018] In one embodiment, the combustion furnace further includes a blower, and the blower is arranged at the first air inlet or the second air outlet;
[0019] And / or, one of the first air inlet and the second air outlet is arranged at the bottom of the shell, and the other is arranged at the top of the shell. The first air inlet and the second air outlet are arranged on different sides of the shell.
[0020] The present utility model further provides a water heater, including:
[0021] A heat exchanger arranged inside the shell; and
[0022] The combustion furnace as described above, and the heat exchanger is arranged above the combustion furnace.
[0023] The technical solution of the present utility model is to set part or all of the inner surface of the heat insulation shell as a flame reflection surface. In this way, when the burner burns in the combustion chamber formed by the enclosure of the heat insulation shell, the heat insulation shell can reflect the flame through the flame reflection surface, so as to achieve the effect of radiating heat, and further improve the heat insulation effect of the heat insulation shell. Secondly, an insulation cavity is arranged at intervals between the heat insulation shell and the shell, and a communication hole communicating with the air flow channel and the combustion chamber is opened in the insulation cavity, which can further improve the heat insulation effect of the heat insulation shell during actual use. Brief Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0025] Figure 1 Structural schematic diagram of an embodiment of a combustion furnace provided by the present utility model;
[0026] Figure 2 Structural schematic diagram of the connection between the heat insulation shell and the shell provided by the present utility model;
[0027] Figure 3 is Figure 2 Structural schematic diagram of the disassembly of the shell and the heat insulation shell in ;
[0028] Figure 4 Structural schematic diagram of the heat insulation board in the heat insulation shell provided by the present utility model;
[0029] Figure 5 is Figure 4 Enlarged structural schematic diagram at A in ;
[0030] Explanation of the reference numerals in the drawings:
[0031] 100, combustion furnace; 10, heat insulation shell; 11, combustion chamber; 12, heat insulation board; 121, flame reflection surface; 122, first edge; 123, second edge; 1231, first connection section; 1232, second connection section; 12311, second communication hole; 124, first communication hole; 13, insulation cavity; 20, burner; 30, shell; 31, first air inlet; 32, second air inlet; 40, heat exchanger; 50, fan.
[0032] The realization, functional features and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the drawings. Detailed Embodiments
[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.
[0034] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0035] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.
[0036] Currently, in the prior art, in order to prevent heat from being transmitted to the outside in the form of air medium during the combustion of the combustion furnace, resulting in heat loss, therefore, aluminosilicate heat insulation materials are used to form a combustion chamber around the outside of the combustion furnace to insulate and keep warm the heat generated by the combustion chamber of the combustion furnace and avoid heat dissipation. However, the heat insulation board made of aluminosilicate cotton material will powder and be damaged due to long-term exposure to high temperature during long-term use, and the adhesive inside the aluminosilicate cotton heat insulation board will burn due to high temperature during long-term use, resulting in serious smoke and peculiar smell.
[0037] The present utility model proposes a combustion furnace 100.
[0038] Please refer to Figures 1 to 5 As shown, in an embodiment of the present utility model, the combustion furnace 100 includes a heat insulation shell 10 and a burner 20. A combustion chamber 11 is provided inside the heat insulation shell 10, and at least part of the inner surface of the heat insulation shell 10 is set as a flame reflection surface 121; and at least part of the burner 20 is arranged inside the combustion chamber 11.
[0039] The technical solution of the present utility model is to provide a combustion chamber 11 inside a heat insulation shell 10. The combustion chamber 11 is used for the burner 20 to burn natural gas or liquefied gas. The heat insulation shell 10 has the effect of isolating heat from dissipating to the outside. To make the heat insulation effect of the heat insulation shell 10 better, therefore, at least part of the inner surface of the heat insulation shell 10 is set as a flame reflection surface 121. When the burner 20 burns natural gas or liquefied gas in the combustion chamber 11 to generate flame light, the flame reflection surface 121 can reflect the flame light, so as to achieve heat radiation on the inner side of the combustion chamber 11 through the setting of part of the flame reflection surface 121, and then achieve heat radiation reflection by reflecting the flame light to reduce heat loss. It is worth mentioning that the inner surface of the heat insulation shell 10 refers to the enclosing surface of the combustion chamber 11, that is, the inner wall surface of the heat insulation shell 10 that encloses to form the combustion chamber 11.
[0040] The flame reflection surface 121 provided on the inner surface of the heat insulation shell 10 can be obtained by coating or plating.
[0041] Regarding the burner 20, it can be a conventional burner 20. The conventional burner 20 uses natural gas as fuel and directly heats through the flame.
[0042] It can also be a premixed burner 20. The premixed burner 20 pre-mixes natural gas and air and then ignites the mixture, making the combustion more uniform and efficient.
[0043] Regarding the way of installing the burner 20 in the combustion chamber 11, part of the burner 20 can be extended into the combustion chamber 11, or the burner 20 can be entirely arranged inside the combustion chamber 11. There is no specific limitation on the selection of the burner 20 and the way of installing the burner 20 in the combustion chamber 11.
[0044] In the embodiment of the present utility model, the inner surface of the heat insulation shell 10 is all set as the flame reflection surface 121; and / or, the material of the heat insulation shell 10 is 430 stainless steel. To make the heat insulation effect of the heat insulation shell 10 better, therefore, in this embodiment, the inner surface of the heat insulation shell 10 is all set as the flame reflection surface 121, so that the inner surface of the combustion chamber 11 can achieve the same effect as above, can reflect the flame light, so as to achieve the effect of heat radiation, and further make the heat insulation effect of the heat insulation shell 10 better.
[0045] Regarding the material of the heat insulation shell 10, it can be made of 430 stainless steel, which has excellent corrosion resistance and high-temperature strength. The flame reflection surface 121 can be formed by polishing the inner surface of the combustion chamber 11 where the 430 stainless steel is located, or can be obtained by chemical polishing. There is no excessive limitation here, as long as the flame reflection surface 121 has the function of reflecting flame light.
[0046] Certainly, in other embodiments, the material of the heat insulation shell 10 can also be a nickel-based alloy, or titanium and its alloys, or ceramics. The above-mentioned materials also have excellent corrosion resistance and high-temperature strength. It is worth mentioning that when using the above-mentioned materials to make the heat insulation shell 10, it is necessary to ensure that at least part and / or all of the inner surface enclosing the combustion chamber 11 is set as the flame reflection surface 121.
[0047] In the embodiment of the present utility model, as Figure 3 shown, the heat insulation shell 10 includes at least two heat insulation plates 12, and at least two of the heat insulation plates 12 are connected and enclosed to form the combustion chamber 11; and / or, the heat insulation shell 10 is provided with at least two openings, and the combustion port of the burner 20 extends into one of the openings; and / or, the burner 20 is detachably connected to the heat insulation shell 10. In this embodiment, the heat insulation shell 10 can be integrally provided, or can be formed by connecting at least two heat insulation plates 12, or can be formed by connecting more than two heat insulation plates 12. When the heat insulation shell 10 is formed by enclosing multiple heat insulation plates 12, the multiple heat insulation plates 12 are sequentially connected and enclosed to form the combustion chamber 11. In this embodiment, the heat insulation shell 10 is formed by splicing four heat insulation plates 12 and encloses two openings. One opening is for part or all of the burner 20 to extend into, and the other is for the heat exchanger 40. For example, the heat exchanger 40 is provided on the other opening to exchange heat with the heat generated during combustion. In this embodiment, only the combustion port part of the burner 20 is arranged in the above-mentioned one opening, and the burner 20 is detachably connected to the heat insulation shell 10. In other embodiments, the heat insulation shell 10 can also be arranged above the burner 20 in a plug-in manner.
[0048] The technical solution of the present utility model includes a housing 30, as Figures 1 to 3 shown. In this embodiment, the part where the combustion furnace 100 is arranged in the housing 30 is called the middle part, and the part where the combustion furnace 100 is provided with the burner 20 is called the lower part, and the part where the heat exchanger 40 is arranged is called the upper part. The above orientations are defined with reference to the normal installation and use of the water heater. In this embodiment, the burner 20 can burn gas to heat the water flowing in the heat exchanger 40, and the combustion furnace 100 is detachably connected to the housing 30 through a screwing part or a clamping part.
[0049] In the embodiment of the utility model, the shell 30 is spaced apart from the heat-insulating shell 10, and the space between the shell 30 and the heat-insulating board 12 is set as a heat-insulating cavity 13. In order to further prevent heat from being lost to the outside, in this embodiment, the shell 30 is spaced apart from the heat-insulating shell 10 so that a cavity is formed between the shell 30 and the heat-insulating shell 10, and the cavity is used for heat insulation, so it is called a heat-insulating cavity 13, and the heat-insulating cavity 13 can use air as a medium to further prevent heat from being dissipated to the outside.
[0050] In one embodiment, if Figure 4 and Figure 5 As shown, the heat insulation board 12 of the heat insulation shell 10 has at least a first edge 122 and a second edge 123, and the first edge 122 and the second edge 123 are both extended in a direction away from the combustion chamber 11, the first edge 122 is located at an end of the heat insulation board 12 away from the burner 20, and the second edge 123 is located at an end of the heat insulation board 12 close to the burner 20, and the heat insulation board 12 is connected to the shell 30 via the first edge 122 and the second edge 123, and the heat insulation board 12, the first edge 122, the second edge 123 and the shell 30 are enclosed to form the heat insulation cavity 13. In order to form the heat insulation cavity 13 when the heat insulation shell 10 is installed to the inner side of the shell 30, in the present embodiment, the heat insulation board 12 enclosing the heat insulation shell 10 further comprises at least a first edge 122 and a second edge 123, and the first edge 122 and the second edge 123 are arranged at both ends of the heat insulation board 12 along the extension direction of the heat insulation shell 10, that is, the first edge 122 is arranged at the end of the heat insulation board 12 away from the burner 20, and the second edge 123 is arranged at the end of the heat insulation board 12 close to the burner 20, wherein the first edge 122 and the second edge 123 are both extended in a direction away from the combustion chamber 11, that is, they are protruded in a direction away from the combustion chamber 11, and the heat insulation shell 10 is formed by the first edge 122 and the second edge 123 of the heat insulation board 12. 23 is connected to the shell 30, the first edge 122 and the second edge 123 of the heat insulation board 12 can be connected to the shell 30 by welding or in a detachable manner. In the present embodiment, a mounting portion is arranged above the shell 30 to receive the first edge 122, while the second edge 123 abuts against the inner wall of the shell 30. Since the first edge 122 and the second edge 123 are both protruding in a direction away from the combustion chamber 11, when the heat insulation board 12 is connected to the shell 30 through the first edge 122 and the second edge 123, the heat insulation board 12, the first edge 122, the second edge 123 and the inner wall of the shell 30 are enclosed to form a heat insulation cavity 13. The heat insulation cavity 13 arranged in this way can effectively reduce heat conduction and improve the heat insulation effect.
[0051] Specifically, the second edge 123 includes a connected first connecting section 1231 and a second connecting section 1232. The first connecting section 1231 extends away from the combustion chamber 11. The second connecting section 1232 is provided at one end of the first connecting section 1231 away from the heat insulation plate 12, and the second connecting section 1232 is arranged along the extending direction of the heat insulation plate 12. To enable the second edge 123 to abut more firmly against the inner wall of the housing 30 and form the above-mentioned sealed heat insulation cavity 13, in this embodiment, the first edge 122 includes a first connecting section 1231 and a second connecting section 1232. The first connecting section 1231 and the second connecting section 1232 are fixedly connected. They can be integrally formed or connected in a detachable manner, and no excessive limitation is made on this. Among them, one end of the first connecting section 1231 is connected to the heat insulation plate 12, and the other end of the first connecting section 1231 is connected to the second connecting section 1232. The first connecting section 1231 extends away from the combustion chamber 11, and the second connecting section 1232 is arranged along the extending direction of the heat insulation plate 12, so that the second connecting section 1232 is parallel to the heat insulation plate 12. And since the heat insulation plate 12 is parallel to the inner wall of the housing 30, when the heat insulation plate 12 abuts against the inner wall of the housing 30 through the second edge 123, the abutting surface with the inner wall of the housing 30 can be increased through the second connecting section 1232, thereby making the connection between the heat insulation housing 10 and the housing 30 more stable.
[0052] In one embodiment, as Figure 1 shown, the housing 30 is provided with a first air inlet 31 and a second air outlet 32 for air to enter and exit. An air flow passage is formed between the first air inlet 31 and the second air outlet 32. The combustion chamber 11 and the heat insulation cavity 13 are arranged in the air flow passage, and the combustion chamber 11 communicates with the air flow passage. The housing 30 is provided with a first air inlet 31 and a second air outlet 32. An air flow passage is formed between the first air inlet 31 and the second air outlet 32. The combustion chamber 11 surrounded by the heat insulation housing 10 itself and the heat insulation cavity 13 formed by enclosing with the housing 30 are both arranged in the air flow passage. Among them, the combustion chamber 11 communicates with the air flow passage. When the burner 20 is used in the combustion chamber 11, the outside gas can enter the air flow passage through the first air inlet 31 or the second air outlet 32, and then provide the necessary conditions for combustion for the burner 20, and can drive the flow of the heat-exchanged gas to exchange heat with the heat exchanger 40. The exhausted gas after heat exchange can also be discharged through the first air inlet 31 or the second air outlet 32.
[0053] Specifically, a first communication hole 124 is provided at a position of the heat insulation plate 12 close to the first edge 122; a second communication hole 12311 is provided along the length direction of the first connection section 1231 of the second edge 123, and the heat insulation cavity 13 communicates with the air flow channel and the combustion chamber 11 respectively through the first communication hole 124 and the second communication hole 12311. Since the air in the heat insulation cavity 13 will also be heated when the burner 20 is in use, in order to prevent waste of this part of heat, in this embodiment, a first communication hole 124 is provided at a position of the heat insulation plate 12 close to the first edge 122, and a second communication hole 12311 is provided along the extension length direction of the first connection section 1231 of the second edge 123 of the heat insulation plate 12, so that the heat insulation cavity 13 communicates with the air flow channel, enabling air to enter the heat insulation cavity 13 through the second communication hole 12311, then flow to the combustion chamber 11 through the first communication hole 124, and then flow to the position of the heat exchanger 40 together with the gas exchanged heat in the combustion chamber 11 to exchange heat with the heat exchanger 40. Through such a setting, the heat in the heat insulation cavity 13 can be utilized, and a better heat insulation effect can also be achieved; in other embodiments, there are multiple first communication holes 124, and the multiple first communication holes 124 are provided on multiple heat insulation plates 12 at intervals along the circumferential direction of the heat insulation shell 10, and there are also multiple second communication holes 12311, and the multiple second communication holes 12311 are provided at intervals along the length direction of the first connection section 1231. There are no excessive limitations on the number, opening direction and shape of the first communication hole 124 and the second communication hole 12311.
[0054] In one embodiment, as Figure 1As shown, the combustion furnace 100 further includes a blower 50, and the blower 50 is disposed at the first air inlet 31 or the second air inlet 32; and / or, the first air inlet 31 is disposed at the bottom of the housing 30, and the second air inlet 32 is disposed at the top of the housing 30, and the first air inlet 31 and the second air inlet 32 are disposed on different sides of the housing 30. To enable the gas in the heat insulation chamber 13 to flow more smoothly into the heat exchanger 40, therefore, in this embodiment, a blower 50 is provided at the first air inlet 31 or the second air inlet 32. Assuming that the first air inlet 31 is the air inlet and the second air inlet 32 is the air outlet, in one embodiment, assuming that the blower 50 is disposed at the first air inlet 31, the blower 50 is used to suck in outside air, and then blow the air in the heat insulation chamber 13 to flow towards the second air inlet 32 through the air flow channel, so that the air after heat exchange in the combustion chamber 11 and the air heated in the heat insulation chamber 13 can flow more smoothly into the heat exchanger 40 to exchange heat with the heat exchanger 40. Assuming that the blower 50 is disposed at the second air inlet 32, the blower 50 is used to suck in outside air through the first air inlet 31, and then suck the air after heat exchange in the combustion chamber 11 and the air heated in the heat insulation chamber 13 into the heat exchanger 40 through the air flow channel for heat exchange. Further, to ensure that the air entering the heat exchanger 40 through the first air inlet 31 has heat, therefore, in this embodiment, the first air inlet 31 is disposed at the bottom of the housing 30, and the second air inlet 32 is disposed at the top of the housing 30. In this way, the outside air enters the air flow channel through the first air inlet 31 from the bottom. Then, since the heated air has a tendency to flow upward, the second air inlet 32 is disposed at the top of the housing 30. To prevent the air entering the air flow channel through the first air inlet 31 from directly discharging from the second air inlet 32, therefore, in this embodiment, the first air inlet 31 and the second air inlet 32 are disposed on different sides of the housing 30. For example, the first air inlet 31 is disposed at the front side of the housing 30, and the second air inlet 32 is disposed at the left side or the right side or the rear side of the housing 30. It is better to dispose the second air inlet 32 at the rear side of the housing 30.
[0055] The present utility model further provides a water heater, which includes a heat exchanger 40 and a combustion furnace 100. The specific structure of the combustion furnace 100 refers to the above embodiments. Since this water heater adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated herein one by one. Among them, the heat exchanger 40 is disposed in the housing 30, and the heat exchanger 40 is disposed above the combustion furnace 100.
[0056] The above are only exemplary embodiments of the present utility model, and do not thus limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included within the patent protection scope of the present utility model.
Claims
1. A combustion furnace, characterized in that, Comprising: A heat insulation shell, a combustion chamber is arranged inside the heat insulation shell, and at least part of the inner surface of the heat insulation shell is set as a flame reflection surface; And A burner, at least part of the burner is arranged inside the combustion chamber.
2. The combustion furnace according to claim 1, characterized in that, The inner surface of the heat insulation shell is all set as a flame reflection surface; And / or, the material of the heat insulation shell is 430 stainless steel.
3. The combustion furnace according to claim 1, characterized in that, The heat insulation shell comprises at least two heat insulation plates, and at least two of the heat insulation plates are connected and enclosed to form the combustion chamber; And / or, the heat insulation shell is provided with at least two openings, and the combustion port of the burner extends into the heat insulation shell from one of the openings; And / or, the burner is detachably connected to the heat insulation shell.
4. The combustion furnace according to claim 1, characterized in that, The combustion furnace further comprises a shell, the heat insulation shell and the burner are arranged inside the shell, the shell and the heat insulation shell are arranged at intervals, and the space between the shell and the heat insulation shell is set as a heat insulation cavity.
5. The combustion furnace according to claim 4, characterized in that, The heat insulation plate of the heat insulation shell at least has a first edge and a second edge, both the first edge and the second edge extend in a direction away from the combustion chamber, the first edge is located at one end of the heat insulation plate away from the burner, the second edge is located at one end of the heat insulation plate close to the burner, and the heat insulation plate is connected to the shell through the first edge and the second edge, and the heat insulation plate, the first edge, the second edge and the shell enclose to form the heat insulation cavity.
6. The combustion furnace according to claim 5, characterized in that, The second edge comprises a first connecting section and a second connecting section connected to each other, the first connecting section extends in a direction away from the combustion chamber, the second connecting section is arranged at one end of the first connecting section away from the heat insulation plate, and the second connecting section is arranged along the extending direction of the heat insulation plate.
7. The combustion furnace according to claim 6, characterized in that, The shell is provided with a first air inlet and a second air outlet for air to enter and exit, an air flow channel is formed between the first air inlet and the second air outlet, the combustion chamber and the heat insulation cavity are arranged inside the air flow channel, and the combustion chamber is communicated with the air flow channel.
8. The combustion furnace according to claim 7, characterized in that, A first communication hole is arranged at a position of the heat insulation plate close to the first edge; The first connecting section of the second edge is provided with a second communication hole along its own length direction, and the heat insulation cavity is communicated with the air flow channel and the combustion chamber respectively through the first communication hole and the second communication hole.
9. The combustion furnace according to claim 8, wherein, The combustion furnace further comprises a blower, and the blower is arranged at the first air inlet or the second air outlet; And / or, one of the first air inlet and the second air outlet is arranged at the bottom of the shell, and the other is arranged at the top of the shell, and the first air inlet and the second air outlet are arranged on different sides of the shell.
10. A water heater, characterized in that, Comprising: A heat exchanger, which is arranged inside the shell; And The combustion furnace according to any one of claims 1 to 9, the heat exchanger is arranged above the combustion furnace.