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 and a heat insulation structure, and a combustion chamber is formed in an inner cavity of the frame body; the heat insulation structure is arranged on the inner wall face of the frame body and at least surrounds the combustion chamber. The heat insulation structure comprises heat insulation cotton and aerogel. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the problem of water cut-off temperature rise can be effectively solved. In addition, the noise of the whole machine can be reduced.

Description

Technical Field

[0001] The utility model relates to the 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 components of the gas water heater, the shell of the combustion chamber needs to be cooled.

[0004] In the related art, the shell of the combustion chamber is configured as a double-layer shell to form an air cooling channel, and the outer surface of the shell of the combustion chamber is cooled by air cooling. However, this method is prone to the problem of excessive temperature rise when water is cut off. Utility Model Content

[0005] The main purpose of the utility model is to provide a combustion chamber shell, which aims to reduce the surface temperature of the combustion chamber shell and solve the problem of temperature rise when water is cut off.

[0006] To achieve the above-mentioned purpose, the combustion chamber housing proposed in the present invention includes:

[0007] a frame, an inner cavity of which forms a combustion chamber; and

[0008] a heat-insulating structure, provided on the inner wall surface of the frame and at least surrounding the combustion chamber;

[0009] Wherein, the thermal insulation structure includes thermal insulation cotton and aerogel.

[0010] In one embodiment of the present application, the aerogel has a layered structure; the thermal insulation cotton and the aerogel are stacked in a direction perpendicular to the inner wall surface of the frame.

[0011] In one embodiment of the present application, the surface of the heat insulation structure facing the combustion chamber is the heat insulation cotton.

[0012] In one embodiment of the present application, the surface of the thermal insulation structure in contact with the inner wall surface of the frame is the aerogel.

[0013] In one embodiment of the present application, the thermal insulation structure includes at least one layer of the thermal insulation cotton and at least one layer of the aerogel, and the thermal insulation cotton and the aerogel are alternately stacked.

[0014] In one embodiment of the present application, the layered aerogel includes a substrate and an aerogel powder structure provided on the substrate, and the substrate is glass fiber mat or high silica fiber mat.

[0015] In one embodiment of the present application, the aerogel is a powder structure; and the thermal insulation structure is an integrated fusion structure of the thermal insulation cotton and the aerogel.

[0016] In one embodiment of the present application, the specific heat capacity C of the thermal insulation structure satisfies: 0.1 J / (gK)≤C≤0.5 J / (gK).

[0017] In one embodiment of the present application, the thermal conductivity K of the thermal insulation structure satisfies: 0.08W / (m·K)≤K≤0.12W / (m·K).

[0018] In one embodiment of the present application, the thickness H of the thermal insulation structure satisfies: 3mm≤H≤20mm.

[0019] In one embodiment of the present application, the thermal insulation cotton is silicate fiber, silica fiber or glass fiber;

[0020] And / or, the aerogel is silica aerogel or metal oxide aerogel.

[0021] In one embodiment of the present application, the frame has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the two mounting plates are used to connect to the heat exchanger above the frame;

[0022] The heat insulation structure extends to the mounting plate to separate the heat exchanger from the corresponding mounting plate.

[0023] In one embodiment of the present application, the frame includes:

[0024] The bottom frame includes a back plate and two side plates provided on opposite sides of the back plate, wherein the back plate and the two side plates enclose a cavity with one side open; the back plate extends upward to form the mounting plate; and

[0025] a cover plate, covering the opening to enclose the combustion chamber with the bottom frame; the cover plate extends upward to form another mounting plate;

[0026] The thermal insulation structure includes a first thermal insulation structure and a second thermal insulation structure. The first thermal insulation structure covers the bottom frame and the corresponding inner wall surface of the mounting plate, and the second thermal insulation structure covers the cover plate and the corresponding inner wall surface of the mounting plate.

[0027] In one embodiment of the present application, the peripheral edge of the frame is provided with a flange bent toward the combustion chamber and a claw provided on the flange, the flange covers the edge of the thermal insulation structure, and the claw is limitedly engaged with the surface of the thermal insulation structure facing the combustion chamber;

[0028] And / or, the combustion chamber housing further comprises a limiting net provided on the heat insulation structure toward the combustion chamber, the limiting net being fixedly connected to the frame to limit the heat insulation structure;

[0029] And / or, the combustion chamber housing further comprises a pressing piece provided on the heat insulation structure toward the combustion chamber, the pressing piece being fixedly connected to the frame to limit the heat insulation structure;

[0030] And / or, the combustion chamber housing further includes a plurality of screws, the frame body is provided with mounting holes, and the plurality of screws sequentially pass through the heat insulation structure and the mounting holes and are fixed to the frame body.

[0031] To achieve the above object, the present application further 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;

[0032] The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

[0033] In the combustion chamber shell of the technical solution of the present utility model, a heat insulation structure is provided in the frame, and the heat insulation structure is provided on the inner wall surface of the frame, so that when the gas water heater is working normally to discharge water, the heat insulation structure can prevent the heat in the combustion chamber from being transferred to the frame. When the gas water heater stops discharging water, the combustion chamber shell with a low heat storage capacity will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the problem of temperature rise when the water supply is stopped. In addition, the heat insulation structure of this embodiment includes heat insulation cotton and aerogel, which can simultaneously have the characteristics of high temperature resistance and low thermal conductivity, achieve better heat insulation effect, and effectively reduce the surface temperature of the combustion chamber shell. It can be seen that this embodiment can reduce the surface temperature of the combustion chamber shell and effectively improve the problem of temperature rise when the water supply is stopped. In addition, the structure of this embodiment can also reduce the noise of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1 This is a structural schematic diagram of an embodiment of a combustion chamber housing of the present utility model;

[0036] Figure 2 This is a schematic diagram of the assembly structure of the bottom frame and the heat insulation structure in the embodiment of the utility model;

[0037] Figure 3 for Figure 2 An exploded schematic diagram of an embodiment of the structure 1;

[0038] Figure 4 for Figure 2 An exploded schematic diagram of another embodiment of the structure;

[0039] Figure 5 This is a structural diagram of the bottom frame in an embodiment of the present utility model;

[0040] Figure 6 This is a schematic diagram of the explosion structure of an embodiment of the cover plate and the heat insulation structure of the present invention;

[0041] Figure 7 This is a schematic diagram of the explosion structure of another embodiment of the cover plate and the heat insulation structure of the utility model;

[0042] Figure 8 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;

[0043] Figure 9 for Figure 8 An exploded schematic diagram of an embodiment;

[0044] Figure 10 This is a partial structural diagram of an embodiment of the gas water heater of the present utility model;

[0045] Figure 11 This is a partial structural diagram of another embodiment of the gas water heater of the present utility model.

[0046] Description of Figure Numbers:

[0047] Label name Label name 1 Frame 121 Second mounting plate 11 bottom frame 2 Thermal insulation structure 111 back panel 21 Insulation cotton 112 Side panels 22 Aerogel 113 First mounting plate 3 heat exchanger 114 Flanging 4 burner 115 claws 5 fan 12 Cover

[0048] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0051] 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 an option in which both A and B are satisfied.

[0052] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, 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 number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can 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 present invention.

[0053] A gas water heater is a device that burns gas and produces hot water through a heat exchanger. The gas burns within the combustion chamber, causing the combustion chamber's shell to reach a high temperature. To prevent the high-temperature heat from transferring outward and damaging other components of the gas water heater, the combustion chamber shell must be cooled. Related technologies employ a double- or triple-layered shell to create an air cooling channel, which cools the outer surface of the combustion chamber shell.

[0054] When a user turns off the water supply during water use, the water in the heat exchanger stops flowing. Heat stored in the combustion chamber shell and heat exchanger fins is transferred to the stagnant water in the heat exchanger, causing the water temperature in the heat exchanger to rise. When the user turns the water back on, the abnormally heated water in the heat exchanger flows through the water pipes to the user's water supply, causing the user to feel a scalding sensation, which is known as the water shut-off temperature rise. However, in related technologies, the combustion chamber shell is constructed of double or triple layers of sheet metal, which increases the total heat storage capacity of the combustion chamber shell. More heat is transferred to the heat exchanger to heat the stagnant water, further exacerbating the problem of excessive water shut-off temperature rise.

[0055] Based on this, the present invention proposes a combustion chamber shell, which is used in gas water heaters, aiming to reduce the surface temperature of the combustion chamber shell while solving the problem of temperature rise when water is not supplied. Figures 8 to 11 The gas water heater includes a combustion chamber shell, a heat exchanger 3, a burner 4 and a fan 5. A combustion chamber A is formed inside the combustion chamber shell, which is connected from top to bottom. The heat exchanger 3 is arranged above the combustion chamber shell, and the burner 4 is located below the combustion chamber shell. The burner 4 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 gas and air are mixed and burned flows upward to the heat exchanger 3 to heat the heated devices (such as water pipes) in the heat exchanger 3. The fan 5 plays the role of driving the gas and air into the combustion chamber A for combustion and transporting the high-temperature flue gas after combustion to the heat exchanger 3 for heat exchange, and then discharging the exhaust gas after heat exchange. The structure of the combustion chamber shell is explained below in the form of an embodiment.

[0056] like Figures 1 to 6 As shown, the combustion chamber shell includes a frame 1 and an insulation structure 2. The inner cavity of the frame 1 forms a combustion chamber A. The insulation structure 2 is mounted on the inner wall surface of the frame 1 and at least surrounds the combustion chamber A. The insulation structure 2 includes insulation cotton 21 and aerogel 22.

[0057] By providing a heat-insulating structure 2 on the inner wall surface of the frame 1, the heat-insulating structure 2 is arranged around the combustion chamber A, which can isolate the high-temperature flue gas from the frame 1, preventing the heat in the combustion chamber A from being transferred to the frame 1, thereby reducing the surface temperature of the frame 1. At the same time, the heat-insulating structure 2 prevents heat from being transferred to the frame 1, thereby reducing the heat storage capacity of the frame 1. Therefore, when the user stops using water, the frame 1 with a lower heat storage capacity will not transfer excessive heat to the heat exchanger 3 to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water supply is cut off.

[0058] The thermal insulation structure 2 in this embodiment includes thermal insulation wool 21 and aerogel 22. The thermal insulation wool 21 is flexible and heat-insulating. Compared to the related art's insulation method using rigid insulation boards, the thermal insulation wool 21 in this embodiment has a lower density. Therefore, given the same volume, the thermal insulation wool 21 has a lower mass and, consequently, a lower heat storage capacity. This reduces the overall heat storage capacity of the combustion chamber shell and effectively improves the temperature rise during water outages. The thermal conductivity of aerogel 22 is lower than that of thermal insulation wool 21, meaning that aerogel 22 provides a better insulation effect than thermal insulation wool 21. It can be understood that the high temperature resistance of the thermal insulation cotton 21 in this embodiment is higher than that of the aerogel 22, and the thermal conductivity of the aerogel 22 is lower than that of the thermal insulation cotton 21. Therefore, through the combination of the thermal insulation cotton 21 and the aerogel 22, the thermal conductivity is lower than that of the thermal insulation cotton 21 alone, and the high temperature resistance is better than that of the aerogel 22 alone. Therefore, the thermal insulation structure 2 can take into account the characteristics of high temperature resistance and low thermal conductivity to achieve better thermal insulation effect.

[0059] In addition, the flexibility, porosity and other fluffy properties of the thermal insulation cotton 21 and the aerogel 22 can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need for additional vibration reduction structures.

[0060] It should be noted that the specific structural form of the aerogel 22 in the present thermal insulation structure 2 can be determined according to actual conditions. For example, it can be a layered structure in which aerogel powder is mixed on a separate substrate, and then the aerogel 22 of the layered structure is stacked with the thermal insulation cotton 21; or it can be a structure in which the thermal insulation cotton 21 is directly used as the substrate and aerogel powder is mixed inside the thermal insulation cotton 21. The specific material of the aerogel 22 can be determined according to actual conditions. For example, it can be silicon aerogel, metal oxide aerogel, carbon aerogel, or aerogels made of other materials. In actual applications, the thermal insulation cotton 21 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 made of other materials, as long as it can play a role in fire prevention and heat insulation.

[0061] In summary, in the combustion chamber shell of the present invention's technical solution, an insulation structure 2 is provided within the frame 1. The insulation structure 2 is provided on the inner wall of the frame 1. When the gas water heater is operating normally, the insulation structure 2 can prevent the heat in the combustion chamber A from being transferred to the frame 1. When the gas water heater stops discharging water, the combustion chamber shell, which has a lower heat storage capacity, will not transfer excessive heat to the heat exchanger 3 to heat the stagnant water, effectively improving the problem of temperature rise when the water supply is stopped. In addition, the insulation structure 2 of this embodiment includes insulation cotton 21 and aerogel 22, which can simultaneously possess the characteristics of high temperature resistance and low thermal conductivity, achieving a better insulation effect and effectively reducing the surface temperature of the combustion chamber shell.

[0062] It can be seen from this that this embodiment can reduce the surface temperature of the combustion chamber shell and effectively improve the problem of temperature rise when water is cut off. In addition, the structure of this embodiment can also reduce the noise of the whole machine.

[0063] It can be understood that the specific structural form of the thermal insulation structure 2 can be determined according to actual conditions.

[0064] In one embodiment, if Figure 2 、 Figure 3 as well as Figure 6 , the aerogel 22 is a layered structure; the thermal insulation cotton 21 and the aerogel 22 are stacked in a direction perpendicular to the inner wall surface of the frame 1. In this embodiment, the thermal insulation cotton 21 is set as a layered structure, and the aerogel 22 is also set as a layered structure. The thermal insulation cotton layer and the aerogel layer are arranged on the inner wall surface of the frame 1 in a stacked manner. Such a setting can take into account the characteristics of high temperature resistance and low thermal conductivity. In actual application, the thermal insulation cotton layer can be made of materials such as silicate fiber, silica fiber or glass fiber; as an example, the thermal insulation cotton 21 adopts a low-density aluminum silicate fiber cotton. The density of aluminum silicate cotton is less than 0.2g / cm3, which is much smaller than the density of conventional hard thermal insulation materials such as aluminum silicate board 0.36g / cm3. It is also much smaller than the density of stainless steel used in air cooling mode 7.93g / cm3. Therefore, under the same volume, this embodiment can greatly reduce the heat storage and effectively reduce the water outage temperature rise. Preferably, the density of the heat insulation cotton 21 is 0.128g / cm3 to achieve a better effect of reducing heat storage. As an example, the aerogel 22 layer can be a layered structure formed by glass fiber felt as a base material and mixed with silica aerogel material. The aerogel 22 layer has high strength and does not require an additional fixing structure to fix it. In actual application, since the aerogel 22 layer can withstand a temperature of about 650°C, it cannot withstand direct flame baking. Further, as Figure 3 and Figure 6 The surface of the thermal insulation structure 2 facing the combustion chamber A can be made of thermal insulation cotton 21, that is, the layer structure of the thermal insulation structure 2 closest to the combustion chamber A can be made of thermal insulation cotton 21 to prevent the aerogel 22 with relatively poor high temperature resistance from directly contacting the flame, thereby extending the overall service life of the thermal insulation structure 2.

[0065] Furthermore, if Figure 3 and Figure 6 Considering that the thermal conductivity of aerogel 22 is lower than that of thermal insulation cotton 21, the surface of the thermal insulation structure 2 in contact with the inner wall of the frame 1 can be aerogel 22. This arrangement can more effectively prevent heat from being transferred to the frame 1, thereby achieving a better thermal insulation effect.

[0066] In actual application, the number of layers of thermal insulation cotton 21 and aerogel 22 in the thermal insulation structure 2 may not be limited. For example, there may be one layer of thermal insulation cotton 21 and one layer of aerogel 22, in which case the aerogel 22 layer is located between the thermal insulation cotton 21 and the inner wall surface of the frame 1; or there may be two or more layers of thermal insulation cotton 21 and one layer of aerogel 22, in which case the aerogel 22 layer may be sandwiched between two adjacent layers of thermal insulation cotton 21 or both of the two or more layers of thermal insulation cotton 21 are located at a position where the aerogel 22 layer is away from the inner wall surface of the frame 1; or there may be one layer of thermal insulation cotton 21 and two or more layers of aerogel 22, in which case the aerogel 22 layer may be located between the thermal insulation cotton 21 and the inner wall surface of the frame 1; or there may be two or more layers of thermal insulation cotton 21 and two or more layers of aerogel 22, in which case the two may be alternately stacked or irregularly stacked. The stacking method of the thermal insulation cotton 21 and the aerogel 22 layers may not be specifically limited here. As an example, the thermal insulation structure 2 includes at least one layer of thermal insulation cotton 21 and at least one layer of aerogel 22. The thermal insulation cotton 21 and the aerogel 22 are alternately stacked. Such a configuration can achieve better balance between high temperature resistance and low thermal conductivity.

[0067] In some other embodiments, the layered aerogel 22 can also be a layered structure formed by mixing high-silica fiber (high-temperature resistant glass fiber) felt with silica aerogel material. The aerogel 22 layer structure has a temperature resistance of approximately 1000°C and can be directly used as a thermal insulation material. It can be set on the side of the thermal insulation structure 2 facing the combustion chamber to provide thermal insulation. In addition, the aerogel 22 layer is strong and does not require an additional fixing structure to fix it. In actual application, the aerogel layer 22 structure can be set on the surface close to the combustion chamber, or it can be set on the surface close to the combustion chamber.

[0068] In other embodiments, Figure 4 and Figure 7 , the aerogel 22 is a powdered structure; the thermal insulation structure 2 is an integrated fusion structure of the thermal insulation cotton 21 and the aerogel 22. In this embodiment, the thermal insulation cotton 21 and the aerogel 22 powder can be set as an integrated structure through a fusion process. It can be understood that the thermal insulation structure 2 of this embodiment can be formed into a single-layer structure with low thermal conductivity and high temperature resistance. As an example, the thermal insulation structure 2 can be an integrated structure formed by using the thermal insulation cotton 21 of silicate fiber or silica fiber as the base material and mixing it with silica aerogel powder. This structure can withstand temperatures of approximately 1000°C, taking into account both thermal insulation and high temperature resistance.

[0069] In order to achieve a better thermal insulation effect, in one embodiment of the present application, the specific heat capacity C of the thermal insulation structure 2 satisfies: 0.1 J / (gK)≤C≤0.5 J / (gK).

[0070] It can be understood that the specific heat capacity is the amount of heat absorbed or released by a unit mass of an object when its temperature changes by a unit amount. Specifically in this embodiment, the amount of heat required to increase the temperature of 1 gram of the thermal insulation structure 2 by 1°C is between 0.1 joules and 0.5 joules, ensuring good thermal insulation while reducing thermal conductivity. It should be noted that the specific heat capacity of the present thermal insulation structure 2 is the specific heat capacity of the entire structure of the thermal insulation structure 2. In order to further improve the thermal insulation effect, preferably, the specific heat capacity C of the thermal insulation structure 2 is between 0.1 J / (gK) and 0.3 J / (gK).

[0071] In order to achieve a better thermal insulation effect, in one embodiment of the present application, the thermal conductivity K of the thermal insulation structure 2 satisfies: 0.08W / (m·K)≤K≤0.12W / (m·K).

[0072] As can be understood, thermal conductivity is the amount of heat that passes through a material's unit thickness per unit time, per unit area, and per unit temperature difference. Specifically, in this embodiment, for a one-meter-thick insulation structure 2 with a 1°C temperature difference between its two surfaces, the amount of heat transferred through one square meter in one second is between 0.08 and 0.12 watts. This demonstrates low thermal conductivity and ensures good insulation. To further enhance insulation, the thermal conductivity K of the insulation structure 2 is preferably approximately 0.1 W / (m·K).

[0073] In order to achieve a better thermal insulation effect, in one embodiment of the present application, the thickness H of the thermal insulation structure 2 satisfies: 3mm≤H≤20mm.

[0074] It is understandable that the thickness H of the thermal insulation structure 2 should not be too small or too thick. If it is too small, the thermal insulation effect of the thermal insulation structure 2 will be poor. If it is too thick, the thermal insulation structure 2 will occupy too much space in the combustion chamber A, affecting the combustion effect. Based on this, in this embodiment, the thickness H of the thermal insulation structure 2 is set to meet 3mm≤H≤20mm, ensuring good thermal insulation effect while not occupying too much combustion space. Preferably, the thickness H of the thermal insulation structure 2 meets 5mm≤H≤15mm. In actual application, the thickness H of the thermal insulation structure 2 can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, or 15mm, etc.

[0075] In one embodiment of the present application, Figures 1 to 8 The frame 1 has two mounting plates located above the combustion chamber A. The two mounting plates are arranged opposite to each other and are used to connect to the heat exchanger 3 above the frame 1; the insulation structure 2 is provided at the mounting plate to separate the heat exchanger 3 from the corresponding mounting plate.

[0076] It can be understood that the heat exchanger 3 is installed between two mounting plates and is located above the combustion chamber A. In this embodiment, by extending the heat insulation structure 2 to the mounting plates to separate the mounting plates from the heat exchanger 3, the heat transfer between the mounting plates and the heat exchanger 3 can be isolated, and when the water output stops, the heat of the mounting plates can be prevented from being transferred to the heat exchanger 3, thus avoiding the situation of water stop temperature rise.

[0077] In addition, it should be noted that when the user turns off the water midway, the fan 5 has a post-cleaning action (after the burner 4 stops burning, the fan 5 still runs for a preset time to discharge the flue gas in the combustion chamber A. Optionally, the preset time can be about one minute). This action can extract external cold air to cool the heat insulation structure 2 and the fins of the heat exchanger 3, but the cooling effect on the frame 1 is limited. Then, it may occur that the temperature of the frame 1 is higher than the temperature of the fins of the heat exchanger 3. In this embodiment, by extending the heat insulation structure 2 upward to the heat exchanger 3 to isolate the mounting plates from the heat exchanger 3, it can effectively prevent the higher-temperature frame 1 from conducting its own heat to the heat exchanger 3 after the water supply stops.

[0078] Specifically, as Figures 2 to 5 , the frame 1 includes a bottom frame 11 and a cover plate 12. The bottom frame 11 includes a back plate 111 and two side plates 112 provided on opposite sides of the back plate 111. The back plate 111 and the two side plates 112 enclose a cavity with one side open. The back plate 111 extends upward to form a first mounting plate 113; the cover plate 12 is covered on the open side to enclose the combustion chamber A with the bottom frame 11, and the cover plate 12 extends upward to form a second mounting plate 121; the heat insulation structure 2 includes a first heat insulation structure 2 and a second heat insulation structure 2. The first heat insulation structure 2 covers the inner wall surfaces of the bottom frame 11 and the corresponding mounting plates, and the second heat insulation structure 2 covers the inner wall surfaces of the cover plate 12 and the corresponding mounting plates.

[0079] In this embodiment, the bottom frame 11 includes a back plate 111 and two side plates 112 connected to opposite sides of the back plate 111. The two side plates 112 and the back plate 111 form a frame structure with one side open. Optionally, the cross-sectional shape of the bottom frame 11 generally presents a "匚" shape. By covering the cover plate 12 on the open side, the "匚" shape structure is roughly changed into a cross-sectional shape of "口", thus forming a combustion chamber A with upper and lower openings and surrounded on all sides. Among them, the first mounting plate 113 is formed by the upward extension of the back plate 111, and the second mounting plate 121 is formed by the upward extension of the cover plate 12. The two end plates of the heat exchanger 3 are respectively connected and fixed to the upper edges of the two side plates 112, the side edges of the first mounting plate 113, and the side edges of the second mounting plate 121, and the fin group is clamped between the first mounting plate 113 and the second mounting plate 121.

[0080] In practical applications, the bottom frame 11 can directly adopt a sheet metal plate integrally bent into a "C" - shaped structure, which simplifies the manufacturing process and improves production efficiency. The assembly of the cover plate 12 and the bottom frame 11 can be fixed by screws or snap - fixing, etc. The heat exchanger 3 can be fixed to the two mounting plates and the corresponding side plates 112 through the end plate by screwing or riveting, etc.

[0081] It can be understood that the bottom frame 11 and the cover plate 12 are two independent components. In this embodiment, the heat - insulating structure 2 is set to include two parts, namely the first heat - insulating structure 2 and the second heat - insulating structure 2. Among them, the first heat - insulating structure 2 covers the inner wall surfaces of the bottom frame 11 and the first mounting plate 113, and the second heat - insulating structure 2 covers the inner wall surfaces of the cover plate 12 and the second mounting plate 121. This enables the heat - insulating cotton 21 on the bottom frame 11 and the cover plate 12 to be installed separately, which is more convenient for assembly operations and improves production efficiency.

[0082] In practical applications, the first heat - insulating structure 2 can adopt an integral structure, which is bent into a roughly "C" - shape to fit the shape of the inner wall surface of the bottom frame 11. The part of the first heat - insulating structure 2 corresponding to the back plate 111 can protrude from the upper edge to cover the inner wall surface of the first mounting plate 113. With such a setting, compared with the method of separately setting a heat - insulating structure 2 on different wall surfaces, this embodiment can prevent heat from leaking to the combustion chamber housing through the gaps at the joints of the surfaces, and can achieve a better heat - insulating effect.

[0083] It can be understood that the fixing method of the heat - insulating structure 2 and the frame body 1 can be determined according to the actual situation.

[0084] In one embodiment, as Figure 2 and Figure 5 , the peripheral edge of the frame body 1 is provided with a flanging 114 bent towards the combustion chamber A and a claw 115 provided on the flanging 114. The flanging 114 wraps the edge of the heat - insulating structure 2, and the claw 115 is in limiting cooperation with the surface of the heat - insulating structure 2 facing the combustion chamber A. In this embodiment, the peripheral edge of the side plate 112 of the frame body 1 includes the upper edge, the front edge and the lower edge. By setting the flanging 114 on the upper edge, the front edge and the lower edge, it is used to support the edge of the heat - insulating structure 2 at the side plate 112, and then by setting the claw 115 at the flanging 114 to clamp the heat - insulating structure 2, the fixation of the heat - insulating structure 2 is achieved. Of course, in this way, the flanging 114 and the claw 115 can also be set at the position corresponding to the edge of the heat - insulating structure 2 on the back plate 111 to limit and fix the heat - insulating structure 2 covering the back plate 111. Or, screws can also be drilled on the back plate 111 to limit and fix the heat - insulating structure 2 covering the back plate 111.

[0085] In one embodiment, the combustion chamber shell further includes a plurality of screws, and the frame 1 is provided with mounting holes, and the plurality of screws are sequentially passed through the thermal insulation structure 2 and the mounting holes to be fixed to the frame 1. Optionally, the corresponding first thermal insulation structure 2 parts may be fixed by screws on both the back panel 111 and the side panel 112; or, the corresponding first thermal insulation structure 2 parts may be fixed by screws only on the two side panels 112. The specific method is not limited here, as long as it can ensure that the first thermal insulation structure 2 does not fall off. Accordingly, the corresponding second thermal insulation structure 2 may be fixed by screws on the cover panel 12. In actual application, in order to improve the reliability of the thermal insulation structure 2, gaskets may be provided at the screw locations, and the gaskets may be used to increase the limiting area of ​​the thermal insulation structure 2. In this way, the structural reliability of the thermal insulation structure 2 can be increased to prevent it from being broken when impacted during a drop test or transportation.

[0086] In one embodiment, the combustion chamber housing further includes a limiting net provided on the heat insulation structure 2 toward the combustion chamber A, and the limiting net is fixedly connected to the frame 1 to limit the heat insulation structure 2. It is understandable that the heat insulation structure 2 may break when it is hit during a drop test or transportation. In this embodiment, the limiting net is provided to limit the heat insulation structure 2, thereby ensuring the structural reliability of the heat insulation structure 2 and preventing it from breaking when it is hit during a drop test or transportation. Optionally, the limiting net can be fixed to the bottom frame 11 and the cover plate 12 by welding, screwing, or riveting. Optionally, the limiting net is a metal net.

[0087] In one embodiment, the combustion chamber housing further comprises a pressing plate provided on the heat insulation structure 2 facing the combustion chamber A, and the pressing plate is fixedly connected to the frame 1 to limit the heat insulation structure 2. It is understandable that the heat insulation structure 2 may break when it is hit during a drop test or transportation. In this embodiment, the heat insulation structure 2 is limited by providing a pressing plate to ensure the structural reliability of the heat insulation structure 2 and prevent it from breaking when it is hit during a drop test or transportation. Optionally, the pressing plate is a strip-shaped pressing plate or a circular gasket, which can be fixed to the bottom frame 11 and the cover plate 12 by welding, screwing, or riveting. Optionally, the pressing plate is a metal sheet.

[0088] It should be noted that, in actual application, the fixing method of the thermal insulation structure 2 and the frame 1 is not limited to the above-mentioned fixing methods, and can be any combination of the above-mentioned fixing methods, or can also be some other fixing methods.

[0089] The utility model also proposes a gas water heater, such as Figures 8 to 11The gas water heater includes a burner 4, a heat exchanger 3, a fan 5, and a combustion chamber housing. The specific structure of the combustion chamber housing is similar to that of the above-mentioned embodiments. Since the present gas water heater adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. The heat exchanger 3 is located above the combustion chamber housing, and the burner 4 is located below the combustion chamber housing.

[0090] It can be understood that the type of this gas water heater can be a forced-draft water heater, in which case the fan 5 is located above the heat exchanger 3 and drives the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 5 is located below the burner 4 and drives the airflow by blowing air.

[0091] 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 transformations made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or direct / indirect application 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; and a heat-insulating structure, provided on the inner wall surface of the frame and at least surrounding the combustion chamber; Wherein, the thermal insulation structure includes thermal insulation cotton and aerogel; The frame has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the two mounting plates are used to connect to the heat exchanger above the frame; The heat insulation structure is provided at the mounting plate to separate the heat exchanger from the corresponding mounting plate.

2. The combustion chamber housing according to claim 1, wherein The aerogel has a layered structure; the thermal insulation cotton and the aerogel are stacked in a direction perpendicular to the inner wall surface of the frame.

3. The combustion chamber housing according to claim 2, wherein: The surface of the heat insulation structure facing the combustion chamber is the heat insulation cotton.

4. The combustion chamber housing according to claim 3, wherein: The surface of the heat insulation structure in contact with the inner wall surface of the frame is the aerogel.

5. The combustion chamber housing according to claim 3, wherein: The thermal insulation structure includes at least one layer of the thermal insulation cotton and at least one layer of the aerogel, and the thermal insulation cotton and the aerogel are alternately stacked.

6. The combustion chamber housing according to claim 1, wherein: The heat insulation structure is a single-layer structure.

7. The combustion chamber housing according to any one of claims 2 to 5, characterized in that The layered aerogel comprises a substrate and an aerogel powder structure arranged on the substrate, wherein the substrate is glass fiber mat or high silica fiber mat.

8. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The specific heat capacity C of the thermal insulation structure satisfies: 0.1 J / (gK)≤C≤0.5 J / (gK).

9. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The thermal conductivity K of the thermal insulation structure satisfies the following: 0.08W / (m·K)≤K≤0.12W / (m·K).

10. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The thickness H of the thermal insulation structure satisfies: 3mm≤H≤20mm.

11. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The thermal insulation cotton is silicate fiber, silica fiber or glass fiber; And / or, the aerogel is silica aerogel or metal oxide aerogel.

12. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The heat insulation structure extends from the combustion chamber to the mounting plate.

13. The combustion chamber housing according to claim 12, wherein: The frame includes: The bottom frame includes a back plate and two side plates provided on opposite sides of the back plate, wherein the back plate and the two side plates enclose a cavity with one side open; the back plate extends upward to form the mounting plate; and a cover plate, covering the opening to enclose the combustion chamber with the bottom frame; the cover plate extends upward to form another mounting plate; The thermal insulation structure includes a first thermal insulation structure and a second thermal insulation structure. The first thermal insulation structure covers the bottom frame and the corresponding inner wall surface of the mounting plate, and the second thermal insulation structure covers the cover plate and the corresponding inner wall surface of the mounting plate.

14. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The peripheral edge of the frame body is provided with a flange bent toward the combustion chamber and a claw provided on the flange, the flange covers the edge of the heat insulation structure, and the claw is limitedly engaged with the surface of the heat insulation structure facing the combustion chamber; And / or, the combustion chamber housing further comprises a limiting net provided on the heat insulation structure toward the combustion chamber, the limiting net being fixedly connected to the frame to limit the heat insulation structure; And / or, the combustion chamber housing further comprises a pressing piece provided on the heat insulation structure toward the combustion chamber, the pressing piece being fixedly connected to the frame to limit the heat insulation structure; And / or, the combustion chamber housing further includes a plurality of screws, the frame body is provided with mounting holes, and the plurality of screws sequentially pass through the heat insulation structure and the mounting holes and are fixed to the frame body.

15. A gas water heater, characterized in that: The combustion chamber shell comprises a burner, a heat exchanger, a fan, and a combustion chamber shell according to any one of claims 1 to 14, 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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