Combustion chamber shell and gas water heater

Abstract

The utility model discloses a combustion chamber shell and a gas water heater, and relates to the technical field of gas equipment. Wherein the combustion chamber shell comprises a frame body, a heat insulation layer and a limiting net, and a combustion chamber is formed in an inner cavity of the frame body; the heat insulation layer is arranged on the inner wall surface of the frame body and surrounds the combustion chamber; the limiting net is arranged on the side, close to the combustion chamber, of the heat insulation layer and fixedly connected with the frame to limit the heat insulation layer. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the reliability of the heat insulation layer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas equipment, in particular to a combustion chamber shell and a gas water heater. Background Art

[0002] A gas water heater is a gas appliance that uses gas as fuel and transfers heat to cold water flowing through a heat exchanger through combustion heating to prepare hot water.

[0003] Since the gas burns in the combustion chamber, the shell temperature of the combustion chamber is relatively high. In order to prevent the high-temperature heat energy of the combustion chamber from being transferred outward and damaging other parts of the gas water heater, the shell of the combustion chamber needs to be cooled.

[0004] In the related art, a heat insulation layer is provided on the inner wall of the combustion chamber shell to insulate and cool down. However, when the equipment is hit or dropped during transportation or handling, the heat insulation layer is easily damaged or falls off, resulting in poor reliability. Utility Model Content

[0005] The main purpose of the utility model is to provide a combustion chamber shell, which is intended to reduce the surface temperature of the combustion chamber shell and improve the reliability of the heat insulation layer.

[0006] In order to achieve the above-mentioned purpose, the combustion chamber housing proposed by the utility model includes:

[0007] A frame, the inner cavity of which forms a combustion chamber;

[0008] a heat insulation layer, which is disposed on the inner wall surface of the frame and surrounds the combustion chamber; and

[0009] A limiting net is arranged on a side of the heat insulation layer close to the combustion chamber and is fixedly connected to the frame to limit the heat insulation layer.

[0010] In one embodiment of the present application, the limiting net covers the surface of the heat insulation layer close to the combustion chamber.

[0011] In one embodiment of the present application, the limiting mesh is a metal mesh.

[0012] In one embodiment of the present application, the limiting net is fixed to the frame by welding and / or snapping.

[0013] In one embodiment of the present application, the frame body includes a bottom frame and a cover plate disposed on the bottom frame, and the cover plate and the bottom frame are combined to form the combustion chamber having upper and lower openings;

[0014] The thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer, and the limiting net includes a first limiting net and a second limiting net, wherein the first limiting net is fixed to the bottom frame to limit the first thermal insulation layer, and the second limiting net is fixed to the cover plate to limit the second thermal insulation layer.

[0015] In one embodiment of the present application, the bottom frame includes a back plate and two side plates arranged on opposite sides of the back plate, and the first heat insulation layer covers the inner wall surfaces of the back plate and the two side plates;

[0016] The first limiting net is bent to form three sub-net segments, so as to respectively press the first heat insulation layer located on the inner wall surfaces of the back plate and the two side plates.

[0017] In one embodiment of the present application, the peripheral edge of the side panel is provided with a side panel flange bent toward the combustion chamber, the side panel flange is provided with a claw, the side panel flange covers the edge of the first thermal insulation layer, and the claw and the first limiting net are clamped and limited on the surface toward the combustion chamber.

[0018] In one embodiment of the present application, the second limiting net is fixed to the periphery of the cover plate by welding.

[0019] In one embodiment of the present application, the thermal insulation layer is flexible thermal insulation cotton.

[0020] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber;

[0021] The density of the flexible thermal insulation cotton is less than 0.2g / cm 3 .

[0022] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

[0023] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0J / (gK)≤C≤1.3J / (gK).

[0024] In one embodiment of the present application, the surface of the flexible thermal insulation cotton facing the inner wall surface of the frame is concave-convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the inner wall surface of the frame.

[0025] To achieve the above object, the present application also provides a gas water heater, comprising a burner, a heat exchanger, a fan and the above combustion chamber shell, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell;

[0026] The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

[0027] In the combustion chamber shell of the utility model technical solution, a heat insulation layer is arranged on the inner wall surface of the frame, and the heat insulation layer is arranged around the combustion chamber, so that when the gas water heater is working normally, the heat insulation layer can block the heat in the combustion chamber from being transferred to the frame, reduce the surface temperature of the frame, and reduce the heat storage of the frame; therefore, when the gas water heater stops discharging water, the frame with low heat storage will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. A limiting net is arranged on the side of the heat insulation layer close to the combustion chamber, and the limiting net can be fixedly connected to the frame to press the heat insulation layer to the inner wall surface of the frame to achieve installation limitation of the heat insulation layer; at the same time, the limiting net can increase the limiting area of ​​the heat insulation layer, improve the assembly reliability of the heat insulation layer, and avoid the heat insulation layer from being damaged or falling off from the combustion chamber shell when the equipment collides or falls. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0029] Figure 1 This is a schematic structural diagram of an embodiment of a combustion chamber casing of the utility model;

[0030] Figure 2 It is a schematic diagram of the assembly of a bottom frame, a heat insulation layer, and a first limiting net in an embodiment of the utility model;

[0031] Figure 3 for Figure 2 An exploded schematic diagram of an embodiment;

[0032] Figure 4 This is a schematic diagram of the structure of the bottom frame in the embodiment of the utility model;

[0033] Figure 5 It is a schematic diagram of the assembly of the cover plate, the heat insulation layer and the second limiting net in one embodiment of the utility model;

[0034] Figure 6 for Figure 5 An exploded schematic diagram of an embodiment;

[0035] Figure 7 This is a schematic diagram of the assembly structure of the combustion chamber shell and the heat exchanger in the embodiment of the utility model;

[0036] Figure 8 It is a partial structural schematic diagram of the gas water heater of the utility model;

[0037] Fig. 9 It is a schematic diagram of the structural coordination of the combustion chamber, the heat exchanger and the thermal insulation layer in the embodiment of the utility model.

[0038] Description of Figure Numbers:

[0039]

[0040]

[0041] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0045] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0046] A gas water heater is a device that burns gas and produces hot water through heat exchange through a heat exchanger. The gas burns in the combustion chamber, and the shell temperature of the combustion chamber is relatively high. In order to prevent the high-temperature heat energy of the combustion chamber from being transferred outward and damaging other parts of the gas water heater, the shell of the combustion chamber needs to be cooled. At the same time, when the user turns off the water during water use, the water in the heat exchanger does not flow, and the heat accumulated in the combustion chamber shell and the heat exchanger fins due to heating will be transferred to the stagnant water in the heat exchanger, causing the water temperature in the heat exchanger to rise. When the user turns on the water again, the abnormally heated water in the heat exchanger flows through the water pipe to the user's water point, causing the user to feel hot, which is the problem of temperature rise when the water is stopped. In the related art, an insulation layer is set on the inner wall of the combustion chamber shell to insulate and cool down, so as to improve the problem of temperature rise when the water is stopped. However, when the equipment collides or falls during transportation or handling, it is easy to cause the insulation layer to be damaged or fall off from the combustion chamber shell.

[0047] Based on this, the utility model proposes a combustion chamber shell, which is applied to gas water heaters, aiming to reduce the surface temperature of the combustion chamber shell and the water shut-off temperature rise, while improving the assembly reliability of the insulation layer. It can be understood that Figures 7 to 9 The gas water heater includes a combustion chamber shell, a heat exchanger 4, a burner 5 and a fan 6. A combustion chamber A is formed inside the combustion chamber shell, which is connected from top to bottom. The heat exchanger 4 is arranged above the combustion chamber shell, and the burner 5 is located below the combustion chamber shell. The burner 5 plays the role of ignition and combustion. The combustion chamber A provides a combustion space for the combustion of gas and air. The high-temperature flue gas generated after the mixed combustion of gas and air flows upward to the heat exchanger 4 to heat the heated device (such as a water pipe) in the heat exchanger 4. The fan 6 drives the gas and air into the combustion chamber A for combustion and transports the high-temperature flue gas after combustion to the heat exchanger 4 for heat exchange, and then discharges the exhaust gas after heat exchange. The structure of the combustion chamber shell is explained below in the form of an embodiment.

[0048] like Figures 1 to 4 As shown, the combustion chamber shell includes a frame 1, an insulation layer 3 and a limiting net 2. The inner cavity of the frame 1 forms a combustion chamber A; the insulation layer 3 is arranged on the inner wall surface of the frame 1 and surrounds the combustion chamber A; the limiting net 2 is arranged on the side of the insulation layer 3 close to the combustion chamber A, and is fixedly connected to the frame 1 to limit the insulation layer 3.

[0049] By providing a heat insulating layer 3 on the inner wall surface of the frame 1, the heat insulating layer 3 is arranged around the combustion chamber A, which can isolate the high-temperature flue gas from the frame 1, prevent the heat in the combustion chamber A from being transferred to the frame 1, and achieve the purpose of reducing the surface temperature of the frame 1. At the same time, the heat insulating layer 3 isolates the heat from being transferred to the frame 1, so that the heat storage capacity of the frame 1 is reduced, so that when the user stops using water, the frame 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water supply is stopped.

[0050] By setting a limiting net 2 on the side of the insulation layer 3 close to the combustion chamber A, the limiting net 2 can be fixed to the frame 1 to squeeze the insulation layer 3 toward the inner wall surface of the frame 1, thereby realizing the installation limiting function of the insulation layer 3.

[0051] It can be understood that the limiting net 2 is a mesh structure pressed on the thermal insulation layer 3. Compared with the method of fixing with screws in the related art, the force application area of ​​the thermal insulation layer 3 is increased, so that the force on the thermal insulation layer 3 is more balanced, and the situation of excessive local stress is avoided. In addition, by using the limiting net 2 for limiting, compared with the method of using a partition in the related art, the heat storage capacity of the limiting net 2 is lower, so that the heat transferred to the frame 1 can be further reduced. In actual application, the limiting net 2 can partially cover the wall of the thermal insulation layer 3 facing the combustion chamber A, or it can also completely cover the wall of the thermal insulation layer 3 facing the combustion chamber A. The shape and structure of the limiting net 2 can be determined according to the actual situation, for example, a square mesh structure, a circular mesh structure, a polygonal mesh structure, a honeycomb mesh or some other irregular mesh structures can be used.

[0052] In practical applications, the limiting net 2 can be made of high temperature resistant material. Optionally, the limiting net 2 is a metal net or a non-metal net. The fixing structure of the limiting net 2 and the frame 1 can be determined according to actual conditions. For example, when the limiting net 2 is a metal net, it can be fixed by welding, clamping or screwing, etc.; for example, when the limiting net 2 is a non-metal net, it can be fixed by clamping or screwing, etc. The specific connection method is not limited here.

[0053] In practical applications, the heat insulating layer 3 may be adapted to the shape of the inner wall surface of the frame 1, or may only be adapted to the shape around the combustion chamber A, or may also be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulating layer 3 is at least arranged around the combustion chamber A. It can be understood that the heat insulating layer 3 is only arranged around the combustion chamber A, or the heat insulating layer 3 can be arranged in other parts besides the combustion chamber A, such as a heat exchanger, a flue, etc.

[0054] It is understandable that the specific structure of the insulation layer 3 can also be determined according to the actual situation, for example, an insulation board, flexible insulation cotton or other insulation structures can be used. For better insulation effect, the insulation layer 3 in this embodiment is flexible insulation cotton, which has the characteristics of flexibility and insulation. Compared with the insulation method of using hard insulation boards in the related art, the density of the flexible insulation cotton in this embodiment is lower, so under the same volume, the mass of the flexible insulation cotton is lower, and the heat storage capacity will also be lower, which can reduce the overall heat storage capacity of the combustion chamber shell and effectively improve the water stop temperature rise. In addition, the flexible insulation cotton's flexible, cotton and other fluffy characteristics can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need for additional shock-absorbing structures. The specific material of the flexible insulation cotton can also be determined according to the actual situation, for example, it can be glass fiber insulation cotton, mineral wool insulation cotton, polyester insulation cotton, ceramic fiber insulation cotton, silicate insulation cotton, silica insulation cotton or insulation cotton of other materials, as long as it can play a role in fireproofing and heat insulation.

[0055] In summary, in the combustion chamber shell of the technical solution of the utility model, by setting a heat insulation layer 3 on the inner wall surface of the frame 1, the heat insulation layer 3 is arranged around the combustion chamber A, so that when the gas water heater is working normally, the heat insulation layer 3 can block the heat in the combustion chamber A from being transferred to the frame 1, reduce the surface temperature of the frame 1, and reduce the heat storage of the frame 1; so that when the gas water heater stops discharging water, the frame 1 with low heat storage will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. A limiting net 2 is provided on the side of the heat insulation layer 3 close to the combustion chamber A, and the limiting net 2 can be fixedly connected to the frame 1 to press the heat insulation layer 3 to the inner wall surface of the frame 1 to achieve installation limiting of the heat insulation layer 3; at the same time, the limiting net 2 can increase the limiting area of ​​the heat insulation layer 3, improve the assembly reliability of the heat insulation layer 3, and avoid the heat insulation layer 3 from being damaged or falling off from the combustion chamber shell when the equipment collides or falls.

[0056] In order to further improve the assembly reliability of the thermal insulation layer 3, as Figure 2 and Figure 5 In one embodiment of the present application, the limiting net 2 covers the surface of the heat insulation layer 3 close to the combustion chamber A.

[0057] It can be understood that the insulation layer 3 is covered on the inner wall surface of the frame 1 forming the combustion chamber A. By covering the surface of the insulation layer 3 close to the combustion chamber A with the limiting net 2, the force application area of ​​the limiting net 2 on the insulation layer 3 is further increased, so that the force area of ​​the insulation layer 3 is larger and more balanced, avoiding the occurrence of excessive local stress.

[0058] In order to further improve the assembly reliability of the heat insulation layer 3, in an embodiment of the present application, the limiting net 2 is a metal net. With such a setting, compared with using a non-metal net, the structural strength is higher, and the limiting effect on the heat insulation layer 3 is more reliable.

[0059] Furthermore, the limiting net 2 is fixedly connected to the frame body 1 by welding and / or snap connection to ensure the assembly reliability of the two.

[0060] In an embodiment of the present application, as Figures 2 to 4 , the frame body 1 includes a bottom frame 11 and a cover plate 12 provided on the bottom frame 11. The cover plate 12 and the bottom frame 11 enclose a combustion chamber A with upper and lower openings; the heat insulation layer 3 includes a split first heat insulation layer 31 and a second heat insulation layer 32, and the limiting net 2 includes a split first limiting net 21 and a second limiting net 22. The first limiting net 21 is fixed to the bottom frame 11 to limit the first heat insulation layer 31, and the second limiting net 22 is fixed to the cover plate 12 to limit the second heat insulation layer 32.

[0061] In this embodiment, the upper and lower sides of the bottom frame 11 are open for connecting a heat exchanger and a burner respectively. It can be understood that the bottom frame 11 includes a back plate 111 and two side plates 112 provided on opposite sides of the back plate 111. The connection of the two side plates 112 and the back plate 111 makes the cross-sectional shape of the bottom frame 11 generally present an "L" shape. By covering the cover plate 12 at the open end, the "L" shape structure is roughly changed into a cross-sectional shape of a "square", thereby forming a combustion chamber A with upper and lower openings and a closed periphery.

[0062] By setting the frame body 1 as a split structure of the bottom frame 11 and the cover plate 12, it is more convenient to install internal components such as the first heat insulation layer 31, the second heat insulation layer 32, and the limiting net 2. Correspondingly, the first heat insulation layer 31 and the second heat insulation layer 32 are split structures to respectively cover the inner wall surfaces of the bottom frame 11 and the cover plate 12; the first limiting net 21 and the second limiting net 22 are split structures to respectively limit the first heat insulation layer 31 and the second heat insulation layer 32. With such a setting, the assembly is more convenient.

[0063] During actual assembly, the first heat insulation layer 31 can be first fixed to the inner wall surface of the bottom frame 11, and after the second heat insulation layer 32 is fixed to the inner wall surface of the cover plate 12, the cover plate 12 is then installed on the bottom frame 11. In this way, the inner wall surface of the combustion chamber A can be surrounded by the heat insulation layer 3 to ensure the heat insulation effect. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, rivets or other fixing methods.

[0064] Specifically, as Figures 2 to 4 , the first heat insulation layer 31 covers the inner wall surfaces of the back plate 111 and the two side plates 112; the first limiting net 21 is bent to form three sub-segments to respectively press the first heat insulation layer 31 located on the inner wall surfaces of the back plate 111 and the two side plates 112.

[0065] It can be understood that the back plate 111 and the two side plates 112 are respectively connected at an included angle, so the back plate 111 and the two side plates 112 are respectively in different planes. Then, the first heat insulation layer 31 covering the inner wall surfaces of the back plate 111 and the two side plates 112 is also respectively in different planes. By bending the first limiting net 21 to form three sub-sections, so as to respectively press and set the first heat insulation layer 31 located on the inner wall surfaces of the back plate 111 and the two side plates 112, the first heat insulation layer 31 located in different planes can be limited, ensuring the structural reliability of the first heat insulation layer 31. In addition, it should be noted that the first limiting net 21 of this embodiment is an integral structure, so there is no need to separately set sections for different planes, which simplifies the installation structure and improves the assembly efficiency. Optionally, the first limiting net 21 can be generally set as a "C" - shaped structure to fit the bottom frame 11 of the "C" - shaped structure. In actual application, the first heat insulation layer 31 can also be set as a "C" - shaped integral structure to match the inner wall surfaces of different plates, so that the connection part between adjacent two plates will also be covered by the first heat insulation layer 31, ensuring the heat insulation ability of the connection part.

[0066] Further, as Figures 2 to 4 , the peripheral edge of the side plate 112 is provided with a side - plate flanging 112a that bends towards the combustion chamber A. The side - plate flanging 112a is provided with a claw 114. The side - plate flanging 112a covers the edge of the first heat insulation layer 31, and the claw 114 is clamped and limited with the surface of the first limiting net 21 facing the combustion chamber A.

[0067] It can be understood that the peripheral edge of the side plate 112 includes an upper edge, a front edge and a lower edge. The side - plate flanging 112a is arranged on the upper edge, the front edge and the lower edge to support the upper edge, the side edge and the lower edge of the corresponding first heat insulation layer 31. At the same time, the first limiting net 21 is clamped by the claw 114 to realize the reliable installation of the first heat insulation layer 31 on the side plate 112. In this embodiment, the first limiting net 21 is clamped and limited by the claw 114 of the side - plate flanging 112a, and there is no need to additionally set a special clamping part to fix the first limiting net 21, further simplifying the assembly structure. Of course, in some other embodiments, the first limiting net 21 can also be welded and fixed to the side plate 112.

[0068] In actual application, a back - plate flanging 111a can also be arranged on the inner side of the back plate 111 to support the lower edge of the first heat insulation layer 31. Further, a claw 114 can also be arranged on the back - plate flanging 111a to clamp and limit the lower part of the first limiting net 21, increasing the limiting area of the first limiting net 21 and enlarging the limiting area, which can further improve the installation reliability of the first heat insulation layer 31. Of course, in some other embodiments, the first limiting net 21 can also be welded and fixed to the back plate 111.

[0069] Regarding the assembly of the second heat insulation layer 32 and the cover plate 12, Figure 5 and Figure 6 The second limiting net 22 plays a role in fixing the second heat insulation layer 32 arranged on the inner wall of the cover plate 12. In actual application, the second limiting net 22 can be fixed to the cover plate 12 by screwing, welding or clamping parts.

[0070] Considering the convenience of assembly, as an example, the second limiting net 22 is fixed to the periphery of the cover plate 12 by welding.

[0071] In one embodiment of the present application, Figures 1 to 4 as well as Figure 7 The bottom frame 11 also includes a first mounting plate 113 extending upward from the top wall of the back plate 111, and the first mounting plate 113 is used to connect with the heat exchanger 4 above the combustion chamber shell; the first insulation layer 31 covers the first mounting plate 113 to separate the first mounting plate 113 from the heat exchanger 4.

[0072] It can be understood that the heat exchanger 4 is mounted on the first mounting plate 113, which is located above the combustion chamber. In this embodiment, by extending the first heat insulation layer 31 to the first mounting plate 113 to separate the first mounting plate 113 and the heat exchanger 4, the heat transfer between the first mounting plate 113 and the heat exchanger 4 can be isolated, and when the water supply is stopped, the heat of the first mounting plate 113 can be prevented from being transferred to the heat exchanger 4 to cause the water supply to stop and the temperature rise.

[0073] In addition, it should be noted that when the user turns off the water midway, the fan 6 has a post-cleaning action (after the burner stops burning, the fan 6 still runs for a preset period of time to discharge the smoke in the combustion chamber. Optionally, the preset time can be about one minute). This action can draw cold air from the outside to cool the first insulation layer 31 and the fins of the heat exchanger 4, but the cooling effect on the bottom frame 11 is limited. Then the temperature of the bottom frame 11 may be higher than the temperature of the fins of the heat exchanger 4. This embodiment extends the first insulation layer 31 upward to the heat exchanger 4 and isolates the first mounting plate 113 from the heat exchanger 4. This can effectively prevent the higher temperature bottom frame 11 from transferring its own heat to the heat exchanger 4 after the water is turned off.

[0074] In one embodiment of the present application, Figures 5 to 7 The top wall of the cover plate 12 extends upward to form a second mounting plate 121, which is arranged opposite to the first mounting plate 113, and the heat exchanger 4 is installed between the first mounting plate 113 and the second mounting plate 121. The second heat insulation layer 32 installed on the cover plate 12 extends to the second mounting plate 121 to separate the second mounting plate 121 from the heat exchanger 4 to prevent heat transfer between the two.

[0075] During actual installation, the first heat insulation layer 31 is first installed on the inner wall of the bottom frame 11, and then the heat exchanger 4 is installed on the first mounting plate 113, so that the heat exchanger 4 and the first mounting plate 113 clamp the first heat insulation layer 31 therebetween. At the same time, the second heat insulation layer 32 is installed on the inner wall of the cover plate 12, and then the cover plate 12 with the second heat insulation layer 32 is placed on the bottom frame 11, so that the second heat insulation layer 32 therebetween is clamped and fixed by the second mounting plate 121 and the heat exchanger 4.

[0076] In one embodiment of the present application, the thermal insulation layer 3 may be made of flexible thermal insulation cotton made of silicate fiber, silica fiber or glass fiber. As an example, the flexible thermal insulation cotton is made of low-density aluminum silicate fiber cotton, and the density of the aluminum silicate fiber is less than 0.2g / cm 3 Its density is much lower than that of conventional hard thermal insulation materials such as aluminum silicate board, which has a density of 0.36g / cm 3 , and is also much smaller than the density of stainless steel used in air cooling, which is 7.93 g / cm 3 Therefore, under the same volume, this embodiment can significantly reduce the heat storage and effectively reduce the water outage temperature rise. Preferably, the density of the flexible thermal insulation cotton is 0.128g / cm 3 , to achieve a better effect of reducing heat storage.

[0077] In one embodiment, the specific heat capacity C of the flexible thermal insulation cotton is between 0.3 J / (gK) and 1.5 J / (gK). The specific heat capacity is the amount of heat absorbed or released when a unit mass of an object changes unit temperature. Specifically in this embodiment, the amount of heat required to raise the temperature of 1 gram of flexible thermal insulation cotton by 1°C is between 0.3 joules and 1.5 joules, thereby ensuring good thermal insulation while reducing thermal conductivity. In order to further enhance the thermal insulation effect, preferably, the specific heat capacity C of the flexible thermal insulation cotton is between 1.0 J / (gK) and 1.3 J / (gK). Furthermore, it is preferred that the specific heat capacity C of the flexible thermal insulation cotton is between 1.0 J / (gK) and 1.1 J / (gK).

[0078] Furthermore, the flexible thermal insulation cotton has a porous structure; the surface where the flexible thermal insulation cotton contacts the inner wall of the frame 1 is concave-convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the inner wall of the frame 1 (not shown).

[0079] It is understandable that the density of the flexible thermal insulation cotton is lower than that of the cardboard structure, so at the same volume, the mass of the flexible thermal insulation cotton is lower, and the heat storage capacity is also lower. The internal structure of the flexible thermal insulation cotton is relatively fluffy and porous, and the surface of the flexible thermal insulation cotton is uneven. When the flexible thermal insulation cotton is installed on the inner wall of the frame 1, some irregular gas microchannels will be formed between the flexible thermal insulation cotton and the inner wall of the frame 1. The gas microchannel can isolate the flexible thermal insulation cotton from the frame 1 on the one hand, and can also absorb and reduce noise on the other hand.

[0080] The utility model also provides a gas water heater, such as Figures 7 to 9 The gas water heater comprises a burner 5, a heat exchanger 4, a fan 6 and a combustion chamber shell. The specific structure of the combustion chamber shell is referred to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the heat exchanger 4 is arranged above the combustion chamber shell, and the burner 5 is arranged below the combustion chamber shell.

[0081] It can be understood that the type of the gas water heater can be a forced-draft water heater, in which case the fan 6 is arranged above the heat exchanger 4 to drive the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 6 is arranged below the burner 5 to drive the airflow by blowing air.

[0082] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, the inner cavity of which forms a combustion chamber; A heat insulation layer is arranged on the inner wall surface of the frame and surrounds the combustion chamber; as well as A limiting net is arranged on a side of the heat insulation layer close to the combustion chamber and is fixedly connected to the frame to limit the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that The limiting net covers the surface of the heat insulation layer close to the combustion chamber.

3. The combustion chamber housing according to claim 2, characterized in that The limiting net is a metal net.

4. The combustion chamber housing according to claim 3, characterized in that The limiting net is fixed to the frame by welding and / or clamping.

5. The combustion chamber housing according to claim 4, characterized in that The frame body comprises a bottom frame and a cover plate arranged on the bottom frame, wherein the cover plate and the bottom frame are combined to form the combustion chamber having upper and lower openings; The thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer, and the limiting net includes a first limiting net and a second limiting net, wherein the first limiting net is fixed to the bottom frame to limit the first thermal insulation layer, and the second limiting net is fixed to the cover plate to limit the second thermal insulation layer.

6. The combustion chamber housing according to claim 5, characterized in that The bottom frame includes a back plate and two side plates arranged on opposite sides of the back plate, and the first heat insulation layer covers the inner wall surfaces of the back plate and the two side plates; The first limiting net is bent to form three sub-net segments, so as to respectively press the first heat insulation layer located on the inner wall surfaces of the back plate and the two side plates.

7. The combustion chamber housing according to claim 6, characterized in that The peripheral edge of the side panel is provided with a side panel flange bent toward the combustion chamber, the side panel flange is provided with a claw, the side panel flange covers the edge of the first thermal insulation layer, and the claw and the surface of the first limiting net facing the combustion chamber are clamped and limited.

8. The combustion chamber housing according to claim 5, characterized in that The second limiting net is fixed to the periphery of the cover plate by welding.

9. The combustion chamber housing according to any one of claims 1 to 8, characterized in that The heat insulation layer is flexible heat insulation cotton.

10. The combustion chamber housing according to claim 9, characterized in that The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber; The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

11. The combustion chamber housing according to claim 9, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

12. The combustion chamber housing according to claim 11, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0 J / (gK)≤C≤1.3 J / (gK).

13. The combustion chamber housing according to claim 9, characterized in that The surface of the flexible heat-insulating cotton facing the inner wall surface of the frame body is concave-convex, so that a plurality of irregular gas microchannels are provided between the flexible heat-insulating cotton and the inner wall surface of the frame body.

14. A gas water heater, characterized in that: It comprises a burner, a heat exchanger, a fan and a combustion chamber shell according to any one of claims 1 to 13, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell; The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

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