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 water heaters. Wherein the combustion chamber shell comprises a frame body, a fixing frame and a heat insulation layer, and a combustion chamber is formed in an inner cavity of the frame body; the fixing frame is arranged in the frame body, and at least an installation space is formed between the fixing frame and the inner wall face, corresponding to the combustion chamber, of the frame body. The heat insulation layer is at least partially located in the mounting space; wherein the heat insulation layer has deformation allowance in the mounting space. According to the technical scheme, the heat insulation effect of the heat insulation layer can be guaranteed, and the purpose of reducing the surface temperature of the combustion chamber shell is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, and particularly relates to a combustion chamber housing and a gas water heater. Background Art

[0002] A gas water heater refers to a gas device 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 gas burns in the combustion chamber, the temperature of the housing of the combustion chamber is relatively high. To prevent the high-temperature heat energy of the combustion chamber from being transferred outward and damaging other components of the gas water heater, it is necessary to cool down the housing of the combustion chamber.

[0004] In related technologies, the method of setting a heat insulation layer on the inner wall of the combustion chamber housing is used for heat insulation and cooling. However, during the combustion process, the heat insulation layer may be deformed and squeezed by heat, which easily leads to an increase in the thermal conductivity of the heat insulation layer and a poor heat insulation effect. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a combustion chamber housing, aiming to ensure the heat insulation effect of the heat insulation layer and achieve the purpose of reducing the surface temperature of the combustion chamber housing.

[0006] To achieve the above purpose, the combustion chamber housing proposed by the utility model includes:

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

[0008] A fixing frame, which is arranged in the frame body and constructs at least an installation space between the frame body and the inner wall surface corresponding to the combustion chamber; and

[0009] A heat insulation layer, at least part of which is located in the installation space; wherein, the heat insulation layer has a deformation allowance in the installation space.

[0010] In an embodiment of the present application, the fixing frame includes:

[0011] A plate body, which covers the surface of the heat insulation layer facing away from the inner wall surface of the frame body, and the plate body is spaced from the frame body; and

[0012] A flanging, which is arranged at the edge of the plate body, one end of the flanging is connected to the plate body, and the other end extends towards the inner wall surface of the frame body to limit the edge of the heat insulation layer;

[0013] The plate body, the flanging and the frame body enclose to form the installation space.

[0014] In an embodiment of the present application, the wall surface of the frame body forming the installation space protrudes with a convex bump towards the direction away from the heat insulation layer.

[0015] In an embodiment of the present application, there is a gap between the inner wall surface of the convex hull and the heat insulation layer.

[0016] In an embodiment of the present application, in the normal direction of the inner wall surface of the frame body, the depth dimension d of the convex hull satisfies: 3 mm ≤ d ≤ 5 mm.

[0017] In an embodiment of the present application, a plurality of convex points protruding towards the heat insulation layer are provided on the outer side wall of the convex hull, and the convex points are in contact with the heat insulation layer;

[0018] In the normal direction of the inner wall surface of the frame body, the depth of the convex points is not greater than the depth of the convex hull.

[0019] In an embodiment of the present application, a plurality of reinforcing ribs are provided on the plate body; the plurality of reinforcing ribs are arranged in a vertical and horizontal cross pattern.

[0020] In an embodiment of the present application, at least one fixing lug is provided on the side of the flanging away from the plate body, and the fixing lug is fixedly connected to the frame body;

[0021] The fixing lug protrudes towards the frame body relative to the flanging, so that there is a gap between the flanging and the frame body.

[0022] In an embodiment of the present application, the frame body includes:

[0023] A bottom frame, including a back plate and two side plates respectively provided on opposite sides of the back plate, and the back plate and the two side plates enclose a cavity with one side open; and

[0024] A cover plate, covering the open end and connected to the two side plates to enclose the combustion chamber with upper and lower openings together with the bottom frame;

[0025] Wherein, the inner wall surfaces of the back plate, the two side plates and the cover plate respectively form the installation space with the fixing frame, and the heat insulation layer is provided in the installation space;

[0026] The heat insulation layer is a flexible heat insulation cotton;

[0027] The flexible heat insulation cotton is silicate fiber or silica fiber or glass fiber;

[0028] The density of the flexible heat insulation cotton is less than 0.2 g / cm3.

[0029] To achieve the above object, the present application further provides a gas water heater, including a burner, a heat exchanger, a blower and the above-mentioned combustion chamber housing, the heat exchanger is arranged above the combustion chamber housing, and the burner is arranged below the combustion chamber housing;

[0030] The blower is disposed above the heat exchanger, or the blower is disposed below the burner.

[0031] In the combustion chamber housing of the technical solution of the present utility model, by arranging a fixing frame in the frame body, an installation space is configured between the fixing frame and at least the inner wall surface of the frame body corresponding to the combustion chamber, and at least a heat insulation layer is arranged in the installation space, so that the heat insulation layer surrounds at least the periphery of the combustion chamber. When the gas water heater is working normally to discharge water, the heat insulation layer can block the heat transfer in the combustion chamber to the frame body, reduce the surface temperature of the frame body, and at the same time reduce the heat storage capacity of the frame body. Thus, when the gas water heater stops discharging water, the frame body with a lower heat storage capacity will not transfer too much heat to the heat exchanger to heat the non-flowing water, and can effectively improve the temperature rise when the water stops flowing. At the same time, the installation space can provide a deformation margin for the heat insulation cotton. Thus, during the combustion process, when the fixing frame heats and presses the heat insulation layer, the heat insulation layer can move in the installation space to prevent the heat insulation layer from being compressed. At the same time, when the heat insulation layer expands due to heat, the installation space can provide a deformation margin for the heat insulation layer to prevent the heat insulation layer from being squeezed and compressed. Therefore, the heat insulation ability of the heat insulation layer can be ensured, and further the effect of reducing the temperature rise when the water stops flowing can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 use in 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.

[0033] Figure 1 It is a schematic structural diagram of an embodiment of the combustion chamber housing of the present utility model;

[0034] Figure 2 It is a schematic diagram of the cooperation structure of the bottom frame, the heat insulation layer and the fixing frame in the embodiment of the present utility model;

[0035] Figure 3 For Figure 2 a longitudinal sectional view of the embodiment;

[0036] Figure 4 For Figure 3 a partial enlarged view at K in

[0037] Figure 5 For Figure 3 a partial enlarged view at M in

[0038] Figure 6 For Figure 3 a partial enlarged view at N in

[0039] Figure 7 For Figure 2 Cross-sectional view of the embodiment in the horizontal direction;

[0040] Figure 8 For Figure 2 Exploded view of the embodiment;

[0041] Figure 9 Side view of the fixing bracket in the embodiment of the present utility model;

[0042] Figure 10 Schematic diagram of the cooperation structure of the cover plate, heat insulation layer and fixing bracket in the embodiment of the present utility model;

[0043] Figure 11 For Figure 10 Exploded view of the embodiment;

[0044] Figure 12 Partial schematic diagram of the gas water heater of the present utility model;

[0045] Figure 13 For Figure 12 Schematic diagram of the structure when the cover plate in the embodiment is opened.

[0046] Explanation of the reference numerals in the drawings:

[0047] Label Name Label Name 1 Frame 2 Fixing Bracket 11 Bottom Frame 21 Plate 111 Back Panel 211 Reinforcing Rib 112 Side Panel 22 Flange 12 Cover Plate 23 Fixing Lug 101 Bump 3 Heat Insulation Layer 102 Bump Point 4 Heat Exchanger A Installation Space 5 Burner

[0048] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0049] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0050] 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 position relationship and movement conditions between components in a specific posture (as shown in the 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 throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution where A and B are satisfied simultaneously.

[0052] In addition, if descriptions such as "first", "second", etc. are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may 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.

[0053] A gas water heater is a device that burns gas and produces hot water through heat exchange in a heat exchanger. The gas burns in the combustion chamber, and the temperature of the shell of the combustion chamber is relatively high. To prevent the high-temperature heat energy in the combustion chamber from being transferred outward and damaging other components of the gas water heater, it is necessary to cool down the shell of the combustion chamber. At the same time, when the user closes the water during the water use process, the water in the heat exchanger does not flow. The heat accumulated in the shell of the combustion chamber and the heat exchanger fins due to heat conduction will be conducted to the non-flowing water in the heat exchanger, resulting in an increase in the water temperature in the heat exchanger. When the user opens the water again, the abnormally heated water in the heat exchanger flows through the water pipe to the user's water use location, making the user feel a burning sensation, that is, the problem of water temperature rise during water stoppage.

[0054] In the related art, a heat insulation layer is provided on the inner wall of the shell of the combustion chamber for heat insulation and temperature reduction to improve the problem of water temperature rise during water stoppage. However, during the combustion process, the fixing frame for fixing the heat insulation layer may be deformed by heat and squeeze the heat insulation layer. At the same time, the heat insulation layer may also be deformed by heat expansion and be squeezed, easily resulting in the compression of the heat insulation layer, an increase in the thermal conductivity coefficient, and a poor heat insulation effect.

[0055] For this reason, the present utility model proposes a combustion chamber shell, aiming to provide an installation space A for installing the heat insulation layer 3 inside the frame 1, so that when the heat insulation layer 3 expands due to heat or is squeezed, the installation space A can reserve a deformation space margin for the heat insulation layer 3 to prevent the heat insulation layer 3 from being compressed, so as to ensure the heat insulation ability of the heat insulation layer 3. It can be understood that, as Figure 12 and Figure 13, the gas water heater includes a combustion chamber housing, a heat exchanger 4, a burner 5, and a blower. A combustion chamber that penetrates vertically is formed inside the combustion chamber housing. The heat exchanger 4 is disposed above the combustion chamber housing, and the burner 5 is located below the combustion chamber housing. The burner 5 serves to ignite and burn. The combustion chamber provides a combustion space for the combustion of gas and air. After the gas and air are mixed and burned, the high-temperature flue gas generated flows upward to the heat exchanger 4 to heat the device to be heated (such as a water pipe) in the heat exchanger 4. The blower is used to drive the gas and air into the combustion chamber for combustion and transport the high-temperature flue gas after combustion to the heat exchanger 4 for heat exchange, and then discharge the exhaust gas after heat exchange. Hereinafter, the structure of this combustion chamber housing will be described by way of examples.

[0056] As Figures 1 to 4 shown, the combustion chamber housing includes a frame body 1, a fixing frame 2, and a heat insulation layer 3. A combustion chamber is formed in the inner cavity of the frame body 1. The fixing frame 2 is disposed inside the frame body 1, and at least an installation space A is configured between the fixing frame 2 and at least the inner wall surface of the frame body 1 corresponding to the combustion chamber. The heat insulation layer 3 is at least partially located in the installation space A. Among them, the heat insulation layer 3 has a deformation allowance in the installation space A.

[0057] The inner cavity of the frame body 1 forms a combustion chamber. By arranging the fixing frame 2 inside the frame body 1, at least an installation space A is configured between the fixing frame 2 and at least the inner wall surface of the frame body 1 corresponding to the combustion chamber. At least the heat insulation layer 3 is arranged in the installation space A. Thus, the heat insulation layer 3 surrounds the combustion chamber, which can play a role in isolating the high-temperature flue gas from the frame body 1, preventing the heat in the combustion chamber from being transferred to the frame body 1, and achieving the purpose of reducing the surface temperature of the frame body 1. At the same time, since the heat insulation layer 3 isolates the heat transfer to the frame body 1, the heat storage capacity of the frame body 1 is reduced. Therefore, when the user stops using water, the frame body 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 4 to heat the stagnant water. Thus, the problem of the water temperature rise during shutdown can be effectively improved.

[0058] By arranging at least a part of the heat insulation layer 3 in the installation space A and the heat insulation layer 3 having a deformation allowance in the installation space A, during the combustion process, when the fixing frame 2 is heated and presses the heat insulation layer 3, the heat insulation layer 3 can move in the installation space A to prevent the heat insulation layer 3 from being compressed. At the same time, when the heat insulation layer 3 expands due to heat, the installation space A can provide a deformation allowance for the heat insulation layer 3 to prevent the heat insulation layer 3 from being squeezed and compressed. Thus, the heat insulation ability of the heat insulation layer 3 can be ensured.

[0059] It can be understood that an installation space A is configured between the fixing frame 2 and the housing 1. The installation space A can be formed by the fixing frame 2 and the housing 1 being arranged at intervals. Optionally, the fixing frame 2 can have a concave cavity to form the installation space A with the inner wall surface of the housing 1. Or, the inner wall surface of the housing 1 can have a concave cavity to form the installation space A with the fixing frame 2. The width of the installation space A is greater than the thickness of the heat insulation layer 3, so that the heat insulation layer 3 can move or expand within the installation space A.

[0060] The heat insulation layer 3 is at least partially arranged within the installation space A. It can be understood that the heat insulation layer 3 can be adapted to the shape of the inner wall surface of the housing 1, or can be only adapted to the shape around the combustion chamber, or can be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulation layer 3 at least surrounds the combustion chamber. It can be understood that the heat insulation layer 3 only surrounds the combustion chamber, or the heat insulation layer 3 can be arranged at other parts in addition to the combustion chamber, such as the heat exchanger 4, the flue, etc.

[0061] It can be understood that the specific structure of the heat insulation layer 3 can also be determined according to the actual situation. For example, heat insulation boards, flexible heat insulation cotton or other heat insulation structures can be used. For better heat insulation effect, the heat insulation layer 3 in this embodiment is flexible heat insulation cotton. The flexible heat insulation cotton has the characteristics of flexibility and heat insulation. Compared with the way of using rigid heat insulation boards in the related art, the density of the flexible heat insulation cotton in this embodiment is lower. The flexible heat insulation cotton is a porous medium and has static air gaps inside. Then, under the same volume, the heat insulation ability of this flexible heat insulation cotton is better, and the mass is lower and the heat storage capacity is also lower. Then it can reduce the overall heat storage capacity of the combustion chamber housing and effectively improve the temperature rise during shutdown. In addition, the flexible and fluffy characteristics of the flexible heat insulation cotton, such as being cotton-like, can also play a role in buffering and sound absorption to achieve the effect of noise reduction without the need to additionally set up shock absorption structures. The specific material of the flexible heat insulation cotton can also be determined according to the actual situation. For example, it can be glass fiber heat insulation cotton, mineral wool heat insulation cotton, polyester heat insulation cotton, ceramic fiber heat insulation cotton, silicate heat insulation cotton, silicon dioxide heat insulation cotton or heat insulation cotton of other materials, as long as it can play a role in fire prevention and heat insulation.

[0062] In summary, in the combustion chamber housing of the technical solution of the present utility model, by arranging a fixing frame 2 in the frame body 1, at least an installation space A is constructed between the fixing frame 2 and at least the inner wall surface of the frame body 1 corresponding to the combustion chamber, and at least a heat insulation layer 3 is arranged in the installation space A, so that the heat insulation layer 3 at least surrounds the combustion chamber. When the gas water heater is discharging water normally, the heat insulation layer 3 can block the heat transfer in the combustion chamber to the frame body 1, reduce the surface temperature of the frame body 1, and at the same time reduce the heat storage capacity of the frame body 1. Thus, when the gas water heater stops discharging water, the frame body 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 4 to heat the non-flowing water, which can effectively improve the temperature rise during shutdown. At the same time, the installation space A can provide a deformation margin for the heat insulation cotton. Thus, during the combustion process, when the fixing frame 2 is heated and squeezes the heat insulation layer 3, the heat insulation layer 3 can move in the installation space A to prevent the heat insulation layer 3 from being compressed. At the same time, when the heat insulation layer 3 expands due to heat, the installation space A can provide a deformation margin for the heat insulation layer 3 to prevent the heat insulation layer 3 from being squeezed and compressed. Therefore, the heat insulation ability of the heat insulation layer 3 can be ensured, and further the effect of reducing the temperature rise during shutdown can be ensured.

[0063] In an embodiment of the present application, as Figures 3 to 11 , the fixing frame 2 includes a plate body 21 and a flange 22. The plate body 21 covers the surface of the heat insulation layer 3 facing away from the inner wall surface of the frame body 1, and the plate body 21 is spaced from the frame body 1; the flange 22 is arranged at the edge of the plate body 21, one end of the flange 22 is connected to the plate body 21, and the other end extends towards the inner wall surface of the frame body 1 to limit the edge of the heat insulation layer 3; the plate body 21, the flange 22 and the frame body 1 enclose to form the installation space A.

[0064] In this embodiment, the plate body 21 of the fixing frame 2 is spaced from the inner wall surface of the frame body 1, and the flange 22 at the edge of the plate body 21 can extend towards the inner wall surface of the frame body 1, so that the plate body 21, the flange 22 and the frame body 1 can enclose to form the installation space A. Among them, the plate body 21 plays a role in limiting the surface of the heat insulation layer 3, and the flange 22 plays a role in limiting the edge of the heat insulation layer 3. By simultaneously arranging the plate body 21 and the flange 22, the function of limiting both the surface and the edge of the heat insulation layer 3 is realized, and a better limiting and assembling effect on the heat insulation layer 3 is achieved.

[0065] It should be noted that the heat insulation layer 3 is installed in the installation space A. The plate body 21 can prevent the heat insulation layer 3 from bulging due to expansion during the combustion process, resulting in a change in the volume of the combustion cavity. If the heat insulation layer 3 expands inward, it may cause the flame to directly burn the heat insulation layer 3, resulting in overheating of the wall surface; and when the flame contacts the heat insulation layer 3, the combustion will be incomplete, resulting in excessive flue gas; the change in the volume of the combustion chamber will also cause an increase in the volumetric heat intensity of the combustion system, triggering combustion resonance.

[0066] Furthermore, as Figures 8 to 11, on the side of the flanging 22 facing away from the plate body 21, at least one fixing lug 23 is provided, and the fixing lug 23 is fixedly connected to the frame body 1.

[0067] In this embodiment, by fixedly connecting the fixing lug 23 provided on the flanging 22 to the frame body 1, the fixed mounting of the fixing bracket 2 and the frame body 1 is realized. Such a design can avoid punching assembly holes in the plate body 21 and the heat insulation layer 3, further ensuring the wrapping effect of the plate body 21 on the heat insulation layer 3 and preventing slag leakage.

[0068] Optionally, the fixing lug 23 can be formed by folding the side of the flanging 22 facing away from the plate body 21, or the fixing lug 23 can also be fixedly installed on the flanging 22 by fixing methods such as welding and clamping. In this embodiment, considering the cost and the difficulty of forming, the fixing lug 23 is formed by folding the side of the flanging 22 facing away from the plate body 21. Optionally, the fixing lug 23 is perpendicularly connected to the flanging 22 to enhance the structural strength of the fixing bracket 2 by using a right-angle structure.

[0069] Optionally, the fixing lug 23 and the frame body 1 can be fixed by screwing or welding.

[0070] Furthermore, as Figures 8 to 11 , the fixing lug 23 protrudes towards the frame body 1 relative to the flanging 22, so that there is a gap between the flanging 22 and the frame body 1.

[0071] In this embodiment, by protruding the fixing lug 23 towards the frame body 1 relative to the flanging 22, a gap is formed between the flanging 22 and the frame body 1. Thus, except for the part where the fixing lug 23 of the fixing bracket 2 is in contact with the frame body 1 for fixed cooperation, other parts of the fixing bracket 2 are not in contact with the frame body 1. Thereby, the contact area between the fixing bracket 2 and the frame body 1 can be reduced, the heat transfer area can be reduced, and the situation that too much heat of the combustion chamber fixing bracket is transferred to the frame body 1, resulting in too high a temperature rise of the stop water, can be prevented.

[0072] As an example, the flanging 22 can be retracted by mm to mm relative to the corresponding fixing lug 23.

[0073] In actual application, the number of the fixed lugs 23 can be determined according to the actual situation. For example, one fixed lug 23 can be provided on each flanging 22, or one fixed lug 23 can be provided on some flangings 22, and two or more fixed lugs 23 can be provided on some flangings 22, etc. When two or more fixed lugs 23 are provided on a flanging 22, the two or more fixed lugs 23 can be spaced along the length direction of the flanging 22, so that the force at the flanging 22 is more balanced, and the installation reliability of the fixed bracket is ensured. As an example, two fixed lugs 23 are respectively provided on the flangings 22 at the upper edge and the lower edge of the plate body 21, and the two fixed lugs 23 are spaced transversely; one fixed lug 23 is provided on the flanging 22 at the side edge of the plate body 21, and the fixed lug 23 is located at the middle position in the vertical direction.

[0074] To further ensure the heat insulation ability of the heat insulation layer 3, as Figures 1 to 11 , in an embodiment of the present application, a convex hull 101 protrudes from the wall surface of the frame body 1 forming the installation space A towards the direction away from the heat insulation layer 3.

[0075] By protruding the convex hull 101 from the wall surface of the frame body 1 forming the installation space A towards the direction away from the heat insulation layer 3, the convex hull 101 can increase the volume of the installation space A, provide a larger deformation margin for the deformation of the heat insulation layer 3, thereby effectively reducing the degree of extrusion and compression of the heat insulation layer 3, and the static air inside the heat insulation layer 3 will not be extruded, and further the heat insulation ability of the heat insulation layer 3 can be ensured.

[0076] In actual application, the shape structure of the convex hull 101 can be determined according to the actual situation. For example, it can be a rectangular convex hull 101, a circular convex hull 101, a strip-shaped convex hull 101 or other convex hull 101 structures of some shapes, etc. The convex hull 101 can be formed by pressing the wall surface of the frame body 1, for example, it can be manufactured by stamping.

[0077] In an embodiment of the present application, as Figure 4 and Figure 7 , there is a gap between the inner wall surface of the convex hull 101 and the heat insulation layer 3.

[0078] In this embodiment, by providing a gap between the inner wall surface of the convex hull 101 and the heat insulation layer 3, an air cavity can be formed between the heat insulation layer 3 and the inner wall surface of the convex hull 101. Such a setting can, on the one hand, prevent the heat insulation layer 3 from being compressed when being squeezed and installed by the fixing frame 2, ensure the heat insulation ability, and on the other hand, can reduce the contact area between the heat insulation layer 3 and the frame body 1, reduce the heat transfer area, and prevent too much heat of the combustion chamber from being transferred to the frame body 1 to cause the wall surface to overheat.

[0079] Furthermore, as Figure 4 , in the normal direction of the inner wall surface of the frame body 1, the depth dimension d of the convex hull 101 satisfies: 3 mm ≤ d ≤ 5 mm.

[0080] It can be understood that the outward convex height of the convex hull 101 relative to the inner wall surface of the frame body 1 should not be too small or too large. If it is too small, it will not be able to avoid the heat insulation layer 3, and still compress the heat insulation layer 3 greatly, affecting the heat insulation ability. If it is too large, it may not play a limiting role on the heat insulation layer 3, and at the same time, it will cause the overall volume of the frame body 1 to be relatively large. Based on this, in the normal direction of the inner wall surface of the frame body 1 in this embodiment, the depth dimension d of the convex hull 101 is set to satisfy: 3 mm ≤ d ≤ 5 mm. On the one hand, it can reduce the degree of compression of the heat insulation layer 3 to ensure the heat insulation ability. On the other hand, it can ensure the installation reliability of the heat insulation layer 3 and will not cause the overall volume of the frame body 1 to be relatively large.

[0081] In actual application, the depth d of the convex hull 101 can be selected as 3 mm, 3.3 mm, 3.5 mm, 3.7 mm, 4 mm, 4.1 mm, 4.4 mm, 4.5 mm, 4.8 mm or 5 mm, etc. Preferably, the depth d of the convex hull 101 is selected as 4 mm.

[0082] Furthermore, as Figures 1 to 7 , a plurality of convex points 102 protruding towards the heat insulation layer 3 are provided on the outer side wall of the convex hull 101, and the convex points 102 are in contact with the heat insulation layer 3.

[0083] In this embodiment, by providing a plurality of convex points 102 facing inwards on the convex hull 101, the plurality of convex points 102 can hold the heat insulation layer 3, improving the installation reliability of the heat insulation layer 3, and at the same time keeping a certain gap between the heat insulation layer 3 and the inner wall surface of the convex hull 101, preventing the heat insulation layer 3 from contacting the frame body 1 over a large area and causing solid-phase heat transfer, which is likely to cause the frame body 1 to heat up quickly. When there is a certain gap between the heat insulation layer 3 and the frame body 1, since the thermal conductivity of static air is very low, the heat transferred from the heat insulation layer 3 to the frame body 1 can be effectively reduced, and the wall surface temperature rise can be reduced.

[0084] Optionally, the number of the convex points 102 can be determined according to the actual situation. For example, it can be one, two or more. When two or more convex points 102 are provided on one convex hull 101, the plurality of convex points 102 can be spaced apart on the convex hull 101. Optionally, the plurality of convex points 102 can be arranged in an array.

[0085] Furthermore, as Figure 5 and Figure 6 , in the normal direction of the inner wall surface of the frame body 1, the depth of the convex point 102 is not greater than the depth of the convex hull 101.

[0086] In this embodiment, by setting the depth of the convex point 102 to be not greater than the depth of the convex hull 101, the holding effect of the convex point 102 on the heat insulation layer 3 will not be too tight, preventing the heat insulation layer 3 from being compressed too much when being limited by the fixing frame 2, and affecting the heat insulation effect.

[0087] In order to further improve the heat insulation performance of the heat insulation layer 3, in an embodiment of the present application, as shown in Figure 2 、 Figures 9 to 11 , the plate body 21 is provided with a plurality of reinforcing ribs 211.

[0088] It can be understood that taking the heat insulation layer 3 as a flexible heat insulation cotton as an example, the flexible heat insulation cotton mainly insulates heat through air balls formed by fibrous materials. Because the thermal conductivity of static air is extremely low and there is no convective heat transfer. When the flexible heat insulation cotton is compressed, the number of air balls decreases and it becomes solid heat transfer, so the heat insulation ability will be greatly reduced. Based on this, in this embodiment, by providing a plurality of reinforcing ribs 211 on the plate body 21, the strength of the plate body 21 is increased, which can ensure the heat insulation effect of the heat insulation layer 3, prevent the heat deformation of the plate body 21 during the combustion process from squeezing the heat insulation layer 3, resulting in a weakened heat insulation effect and causing the wall surface to overheat. At the same time, the reinforcing ribs 211 can prevent the plate body 21 from deforming towards the inner side of the combustion chamber and being directly burned by the flame, affecting the service life.

[0089] The shape and structure of the plurality of reinforcing ribs 211 can be determined according to the actual situation. For example, they can be strip-shaped, circular or other shapes, etc. In this embodiment, it is preferably that the plurality of reinforcing ribs 211 are arranged in a vertical and horizontal cross pattern to further enhance the structural strength through the vertical structure.

[0090] Optionally, the reinforcing rib 211 can be a convex rib structure welded on the plate body 21, or it can also be formed by pressing the plate body 21.

[0091] In an embodiment of the present application, as shown in Figure 1 、 Figure 2 、 Figures 8 to 11 , the frame body 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 respectively arranged 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 cover plate 12 is covered on the open mouth and is connected to the two side plates 112 to enclose a combustion chamber with upper and lower openings with the bottom frame 11; wherein, the inner wall surfaces of the back plate 111, the two side plates 112 and the cover plate 12 respectively form an installation space A with the fixing frame 2, and the heat insulation layer 3 is provided in the installation space A.

[0092] In this embodiment, the upper and lower sides of the bottom frame 11 are open for connecting the heat exchanger 4 and the burner 5 respectively. Specifically, the bottom frame 11 includes a back plate 111 and two side plates 112 disposed 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" shaped structure is roughly changed into a cross-sectional shape of a "square", thereby forming a combustion chamber with upper and lower openings and a closed perimeter. 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 heat insulation layer 3 and the fixing bracket. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, riveting or other fixing methods etc.

[0093] The inner wall surfaces of the back plate 111, the two side plates 112 and the cover plate 12 respectively form an installation space A with the fixing frame 2, and a heat insulation layer 3 is provided in each installation space A to ensure the heat insulation ability of the heat insulation layer 3 on the front, back, left and right four sides of the corresponding combustion chamber, so that the heat insulation effect of the entire combustion chamber can be ensured, and the effect of improving the stop water temperature rise can be further enhanced.

[0094] Optionally, convex protrusions 101 are provided on the back plate 111, the two side plates 112 and the cover plate 12, which can further enhance the heat insulation ability of the heat insulation layer 3 on the front, back, left and right four sides of the corresponding combustion chamber, so that the heat insulation effect of the entire combustion chamber can be ensured, and the effect of improving the stop water temperature rise can be further enhanced.

[0095] In an embodiment of the present application, the heat insulation layer 3 can adopt a flexible heat insulation cotton of silicate fiber, silica fiber or glass fiber. As an example, the flexible heat insulation cotton adopts aluminosilicate fiber cotton with a lower density. The density of the aluminosilicate cotton is less than 0.2 g / cm3, and its density is much lower than that of conventional rigid heat insulation materials such as aluminosilicate plates with a density of 0.36 g / cm3. Thus, in the same volume, this embodiment can greatly reduce the heat storage capacity and effectively reduce the stop water temperature rise. Preferably, the density of the flexible heat insulation cotton is 0.128 g / cm3 to achieve a better effect of reducing the heat storage capacity.

[0096] Furthermore, the flexible heat insulation cotton is a porous structure; the surfaces of the flexible heat insulation cotton in contact with the inner wall surface of the frame body 1 and the plate body 21 are concave and convex, so that there are a plurality of irregular gas micro-channels between the flexible heat insulation cotton and the inner wall surface of the frame body 1 and between the flexible heat insulation cotton and the wall surface of the plate body 21.

[0097] It can be understood that compared with the cardboard body 21 structure, the density of this flexible heat insulation cotton is lower. Then, under the same volume, the mass of this flexible heat insulation cotton is lower, and thus the heat storage capacity will also be lower. The internal structure of the flexible heat insulation cotton is relatively fluffy and porous, and the surface of the flexible heat insulation cotton is uneven. Then, when the flexible heat insulation cotton is installed on the inner wall surface of the frame body 1, some irregular gas micro-channels will be formed between the flexible heat insulation cotton and the inner wall surface of the frame body 1. On the one hand, these gas micro-channels can play a role in isolating the flexible heat insulation cotton from the frame body 1, and on the other hand, they can play a role in sound absorption and noise reduction. Correspondingly, some irregular gas micro-channels will also be formed between the flexible heat insulation cotton and the inner wall surface of the plate body 21. On the one hand, these gas micro-channels can play a role in isolating the flexible heat insulation cotton from the plate body 21, and on the other hand, they can play a role in sound absorption and noise reduction.

[0098] The present utility model also proposes a gas water heater, such as Figure 12 and Figure 13 , the gas water heater includes a burner 5, a heat exchanger 4, a blower and a combustion chamber housing. The specific structure of the combustion chamber housing refers to the above-mentioned embodiments. Since this gas water heater adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the heat exchanger 4 is arranged above the combustion chamber housing, and the burner 5 is arranged below the combustion chamber housing.

[0099] It can be understood that the type of this gas water heater can be a strong exhaust type water heater. At this time, the blower is arranged above the heat exchanger 4, and the air flow is driven by negative pressure suction; or it can also be a forced draft type water heater. At this time, the blower is arranged below the burner 5, and the air flow is driven by forced blowing.

[0100] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present utility model.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, the inner cavity of which forms a combustion chamber; A fixing frame is disposed in the frame and forms a mounting space between the frame and at least an inner wall surface of the combustion chamber; and The heat insulation layer is at least partially located in the installation space; wherein the heat insulation layer has a deformation margin in the installation space.

2. The combustion chamber housing according to claim 1, characterized in that The fixing frame comprises: A plate body is arranged to cover the surface of the heat insulation layer away from the inner wall of the frame, and the plate body is spaced apart from the frame body; and A flange, arranged at the edge of the plate body, one end of the flange is connected to the plate body, and the other end extends toward the inner wall surface of the frame body to limit the edge of the heat insulation layer; The plate body, the flange and the frame body are enclosed to form the installation space.

3. The combustion chamber housing according to claim 2, characterized in that The wall surface of the frame forming the installation space is provided with a convex hump in a direction away from the heat insulation layer.

4. The combustion chamber housing according to claim 3, characterized in that There is a gap between the inner wall surface of the convex hull and the heat insulation layer.

5. The combustion chamber housing according to claim 3, characterized in that In the normal direction of the inner wall surface of the frame, the depth dimension d of the convex hull satisfies: 3mm≤d≤5mm.

6. The combustion chamber housing according to claim 4, characterized in that The outer side wall of the convex hull is provided with a plurality of convex points protruding toward the heat insulation layer, and the convex points abut against the heat insulation layer; In the normal direction of the inner wall surface of the frame, the depth of the convex point is not greater than the depth of the convex hull.

7. The combustion chamber housing according to any one of claims 2 to 6, characterized in that The plate body is provided with a plurality of reinforcing ribs; the plurality of reinforcing ribs are arranged in a horizontal and vertical cross pattern.

8. The combustion chamber housing according to any one of claims 2 to 6, characterized in that At least one fixing lug is provided on a side of the flange facing away from the plate body, and the fixing lug is fixedly connected to the frame body; The fixing lug is arranged to protrude toward the frame relative to the flange, so that a gap exists between the flange and the frame.

9. The combustion chamber housing according to any one of claims 1 to 6, characterized in that The frame comprises: A bottom frame, comprising a back plate and two side plates arranged on opposite sides of the back plate, wherein the back plate and the two side plates enclose a cavity with one side open; and A cover plate, which covers the opening and is connected to the two side plates to enclose the bottom frame to form the combustion chamber with upper and lower openings; Wherein, the inner wall surfaces of the back plate, the two side plates and the cover plate respectively form the installation space with the fixing frame, and the heat insulation layer is provided in the installation space; The thermal insulation layer is a flexible thermal insulation cotton; the flexible thermal insulation cotton is a silicate fiber or a silica fiber or a glass fiber; the density of the flexible thermal insulation cotton is less than 0.2g / cm3.

10. 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 9, 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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