Combustion chamber shell and gas water heater

Abstract

The utility model discloses a combustion chamber shell and a gas water heater, and relates to the technical field of gas equipment. Wherein the combustion chamber shell comprises a frame body, a heat insulation layer, at least two pressing pieces and at least two fixing pieces, and a combustion chamber is formed in an inner cavity of the frame body; the heat insulation layer is arranged on the inner wall surface of the frame body and surrounds the combustion chamber; at least two pressing sheets are arranged on one side, close to the combustion chamber, of the heat insulation layer; the at least two fixing pieces are fixedly connected with the pressing piece and the frame body and used for limiting the heat insulation layer. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the reliability of the heat insulation layer is improved.

Description

Technical Field

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

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

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

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

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

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

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

[0008] A heat insulation layer is arranged on the inner wall surface of the frame and surrounds the combustion chamber;

[0009] at least two pressing sheets, disposed on a side of the heat insulation layer close to the combustion chamber; and

[0010] At least two fixing members are used to fixedly connect the pressing sheet and the frame to limit the heat insulation layer.

[0011] In one embodiment of the present application, at least two of the pressing sheets are spaced apart and distributed on the surface of the heat insulation layer facing the combustion chamber;

[0012] Each of the pressing sheets corresponds to at least one of the fixing members.

[0013] In one embodiment of the present application, the pressing sheet is a strip-shaped pressing sheet; each of the pressing sheets is fixed to the frame through at least two fixing members.

[0014] In one embodiment of the present application, the pressing sheet is arranged to extend along the circumference of the combustion chamber;

[0015] At least two of the pressing sheets are arranged on the surface of the heat insulation layer at intervals along the height direction of the combustion chamber.

[0016] In one embodiment of the present application, the fixing member comprises a screw, and the screw passes through the pressing sheet, the heat insulation layer and the frame body in sequence and is screwed and fixed;

[0017] And / or, the fixing member includes a clamping member, and the pressing sheet is clamped and fixed to the frame through the clamping member to limit the thermal insulation layer.

[0018] In one embodiment of the present application, the frame body includes a bottom frame and a cover plate disposed on the bottom frame, and the cover plate and the bottom frame are combined to form the combustion chamber having upper and lower openings;

[0019] The thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer. The first thermal insulation layer is limited to the inner wall surface of the bottom frame by a first pressing sheet and a first fixing member, and the second thermal insulation layer is limited to the inner wall surface of the cover plate by a second pressing sheet and a second fixing member.

[0020] In one embodiment of the present application, the bottom frame includes a back plate and two side plates arranged on opposite sides of the back plate, and the first heat insulation layer covers the inner wall surfaces of the back plate and the two side plates;

[0021] The first pressing sheet is a strip-shaped pressing sheet, and the first pressing sheet is bent to form three sections of pressing strips, so as to respectively press the first heat insulation layer located on the inner wall surfaces of the back plate and the two side plates;

[0022] The three sections of the press strips are respectively fixed to the back panel and the two side panels through the corresponding first fixing members.

[0023] In one embodiment of the present application, the first fixing member corresponding to the back plate is a screw, and the screw passes through the corresponding sub-pressing strip, the first heat insulation layer and the back plate in sequence and is screwed and fixed;

[0024] The first fixing member corresponding to the side plate is a clamping member.

[0025] In one embodiment of the present application, the peripheral edge of the side plate is provided with a side plate flange bent toward the combustion chamber, the side plate flange is provided with a first claw, the side plate flange covers the edge of the first heat insulation layer, and the first claw is limitedly matched with the surface of the first heat insulation layer facing the combustion chamber;

[0026] Wherein, the first clamping claw located at the side of the side panel away from the back panel is the clamping member, so as to be clamped and matched with the sub-pressing strip corresponding to the side panel.

[0027] In one embodiment of the present application, the second pressing sheet is a strip-shaped pressing sheet;

[0028] The second fixing member includes a pressing plate flange provided on the second pressing plate and a second clamping claw provided at the end of the pressing plate flange, the pressing plate flange penetrates the second heat insulation layer and the cover plate, and the second clamping claw is clamped and fixed to the outer wall surface of the cover plate.

[0029] In an embodiment of the present application, the pressing plate is a circular gasket, the fixing member is a screw, and each pressing plate is fixed to the frame by one of the screws.

[0030] In one embodiment of the present application, the frame is provided with at least two convex bumps toward the combustion chamber, and the convex bumps abut against the heat insulation layer to form an air gap between the heat insulation layer and the frame;

[0031] The fixing member comprises a screw, and a mounting hole is arranged at the convex portion. The screw passes through the pressing sheet and the heat insulation layer and is screwed to the mounting hole.

[0032] In one embodiment of the present application, the screw is a self-tapping screw, which includes a head and a tip, and the tip is located in a recess formed by the convex bump toward the outer wall surface.

[0033] In one embodiment of the present application, the thermal insulation layer is flexible thermal insulation cotton.

[0034] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber;

[0035] The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

[0036] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

[0037] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0J / (gK)≤C≤1.3J / (gK).

[0038] In one embodiment of the present application, the surface of the flexible thermal insulation cotton facing the inner wall surface of the frame is concave-convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the inner wall surface of the frame.

[0039] To achieve the above object, the present application also provides a gas water heater, comprising a burner, a heat exchanger, a fan and the above combustion chamber shell, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell;

[0040] The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

[0041] In the combustion chamber shell of the utility model technical solution, a heat insulation layer is arranged on the inner wall surface of the frame, and the heat insulation layer is arranged around the combustion chamber, so that when the gas water heater is working normally, the heat insulation layer can block the heat in the combustion chamber from being transferred to the frame, reduce the surface temperature of the frame, and reduce the heat storage of the frame; therefore, when the gas water heater stops discharging water, the frame with low heat storage will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. At least two pressing plates are arranged on the side of the heat insulation layer close to the combustion chamber, and the at least two pressing plates can be fixedly connected to the frame through fixing parts to press the heat insulation layer to the inner wall surface of the frame to achieve installation limit of the heat insulation layer; at the same time, the at least two pressing plates can increase the limit position of the heat insulation layer, increase the force-bearing area of ​​the heat insulation layer, and thus improve the assembly reliability of the heat insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0043] Figure 1 This is a schematic structural diagram of an embodiment of a combustion chamber casing of the utility model;

[0044] Figure 2 It is a schematic diagram of the assembly of a bottom frame, a heat insulating layer, a pressing sheet and a fixing member in one embodiment of the utility model;

[0045] Figure 3 for Figure 2 An exploded schematic diagram of an embodiment;

[0046] Figure 4 This is a schematic diagram of the structure of the bottom frame in the embodiment of the utility model;

[0047] Figure 5 This is a schematic diagram of the appearance of the cover plate, the heat insulation layer, the pressing sheet and the fixing parts when assembled in the embodiment of the utility model;

[0048] Figure 6 for Figure 5 The inner structural diagram of the embodiment;

[0049] Figure 7 for Figure 5 An exploded schematic diagram of an embodiment;

[0050] Figure 8 It is a schematic diagram of assembling another embodiment of the bottom frame, the heat insulating layer, the pressing sheet and the fixing member in the utility model;

[0051] Fig. 9 for Figure 8 An exploded schematic diagram of an embodiment;

[0052] Fig.10 It is a schematic diagram of the assembly of another embodiment of the cover plate, the heat insulation layer, the pressing sheet and the fixing member in the embodiment of the utility model;

[0053] Fig.11 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;

[0054] Fig.12 It is a partial structural schematic diagram of the gas water heater of the utility model;

[0055] Fig.13 It is a schematic diagram of the structural coordination of the combustion chamber, the heat exchanger and the thermal insulation layer in the embodiment of the utility model.

[0056] Description of Figure Numbers:

[0057] Label name Label name 1 Frame 2 Tablet pressing 11 Bottom frame 21 First tableting 111 Back Plate 21a Sub-layering 111a Back panel flange 22 Second pressing sheet 112 Side panels 22a Tablet Flanging 112a Side panel flanging 22b Second jaw 113 First mounting plate 3 Insulation 114 First jaw 31 First insulation layer 12 Cover 32 Second insulation layer 121 Second mounting plate 4 Fixings 101 convex hull 5 Heat Exchanger 101a Mounting holes 6 Burner 102 Exhaust 7 Fan

[0058] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0060] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0061] At the same time, the meaning of "and / or" or "and / or" appearing in the full text includes three options. Taking "A and / or B" as an example, it includes option A, or option B, or a option in which both A and B are satisfied.

[0062] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0063] A gas water heater is a device that burns gas and produces hot water through heat exchange through a heat exchanger. The gas burns in the combustion chamber, and the shell temperature of the combustion chamber is relatively high. In order to prevent the high-temperature heat energy of the combustion chamber from being transferred outward and damaging other parts of the gas water heater, the shell of the combustion chamber needs to be cooled. At the same time, when the user turns off the water during water use, the water in the heat exchanger does not flow, and the heat accumulated in the combustion chamber shell and the heat exchanger fins due to heating will be transferred to the stagnant water in the heat exchanger, causing the water temperature in the heat exchanger to rise. When the user turns on the water again, the abnormally heated water in the heat exchanger flows through the water pipe to the user's water point, causing the user to feel hot, which is the problem of temperature rise when the water is stopped. In the related art, an insulation layer is set on the inner wall of the combustion chamber shell to insulate and cool down, so as to improve the problem of temperature rise when the water is stopped. However, when the equipment collides or falls during transportation or handling, it is easy to cause the insulation layer to be damaged or fall off from the combustion chamber shell.

[0064] Based on this, the utility model proposes a combustion chamber shell, which is applied to gas water heaters, aiming to reduce the surface temperature of the combustion chamber shell and the water shut-off temperature rise, while improving the assembly reliability of the insulation layer. It can be understood that Figures 11 to 13 The gas water heater includes a combustion chamber shell, a heat exchanger 5, a burner 6 and a fan 7. A combustion chamber that passes through from top to bottom is formed inside the combustion chamber shell. The heat exchanger 5 is arranged above the combustion chamber shell, and the burner 6 is located below the combustion chamber shell. The burner 6 plays the role of ignition and combustion. The combustion chamber 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 5 to heat the heated device (such as a water pipe) in the heat exchanger 5. The fan 7 drives the gas and air into the combustion chamber for combustion and transports the high-temperature flue gas after combustion to the heat exchanger 5 for heat exchange, and then discharges the exhaust gas after heat exchange. The structure of the combustion chamber shell is explained in the following by way of an embodiment.

[0065] like Figures 1 to 5As shown, the combustion chamber shell includes a frame 1, an insulation layer 3, at least two pressing plates 2 and at least two fixing members 4; a combustion chamber is formed in the frame 1; the insulation layer 3 is arranged on the inner wall surface of the frame 1 and surrounds the combustion chamber; at least two pressing plates 2 are arranged on one side of the insulation layer 3 close to the combustion chamber; at least two fixing members 4 are fixedly connected between the pressing plates 2 and the frame 1 to limit the insulation layer 3.

[0066] In this embodiment, the inner cavity of the frame 1 forms a combustion chamber, and a heat insulation layer 3 is provided on the inner wall surface of the frame 1. The heat insulation layer 3 is provided around the combustion chamber A, which can isolate the high-temperature flue gas from the frame 1, and prevent the heat in the combustion chamber A from being transferred to the frame 1, thereby achieving the purpose of reducing the surface temperature of the frame 1. At the same time, the heat insulation layer 3 isolates the heat from being transferred to the frame 1, and the heat storage capacity of the frame 1 is reduced. Therefore, when the user stops using water, the frame 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 5 to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water supply is stopped.

[0067] By arranging at least two pressing plates 2 on the side of the thermal insulation layer 3 close to the combustion chamber A, the at least two pressing plates 2 can be fixed to the frame 1 by at least two fixing members 4, so that the at least two pressing plates 2 can press the thermal insulation layer 3 toward the inner wall surface of the frame 1, thereby realizing the installation limiting function of the thermal insulation layer 3.

[0068] It should be noted that, in this embodiment, by using at least two pressing plates 2 to limit the heat insulation layer 3, the force-bearing position of the heat insulation layer 3 is increased, and the force-bearing area of ​​the heat insulation layer 3 is increased, so that the assembly reliability of the heat insulation layer 3 can be improved. In actual application, the number of pressing plates 2 can be determined according to actual conditions, for example, it can be 2, 3 or more. The shape and structure of the pressing plate 2 can also be determined according to actual conditions, for example, it can be circular, bar, triangular, square or other special-shaped structures. It can be understood that the specific structure of the fixing member 4 can be determined according to actual conditions, for example, it can be a screw, a snap-on member, a magnetic member or other fixing structures. Correspondingly, the fixing member 4 can be fixedly connected to the pressing plate 2 and the frame 1 by screw fixing, snap-on fixing, magnetic fixing or other fixing methods. The specific connection method is not limited here.

[0069] In practical applications, the heat insulating layer 3 may be adapted to the shape of the inner wall surface of the frame 1, or may only be adapted to the shape around the combustion chamber A, or may also be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulating layer 3 is at least arranged around the combustion chamber A. It can be understood that the heat insulating layer 3 is only arranged around the combustion chamber A, or the heat insulating layer 3 can be arranged in other parts besides the combustion chamber A, such as the heat exchanger 5, the flue, etc.

[0070] It is understandable that the specific structure of the insulation layer 3 can also be determined according to the actual situation, for example, an insulation board, flexible insulation cotton or other insulation structures can be used. For better insulation effect, the insulation layer 3 in this embodiment is flexible insulation cotton, which has the characteristics of flexibility and insulation. Compared with the insulation method of using hard insulation boards in the related art, the density of the flexible insulation cotton in this embodiment is lower, so under the same volume, the mass of the flexible insulation cotton is lower, and the heat storage capacity will also be lower, which can reduce the overall heat storage capacity of the combustion chamber shell and effectively improve the water stop temperature rise. In addition, the flexible insulation cotton's flexible, cotton and other fluffy characteristics can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need for additional shock-absorbing structures. The specific material of the flexible insulation cotton can also be determined according to the actual situation, for example, it can be glass fiber insulation cotton, mineral wool insulation cotton, polyester insulation cotton, ceramic fiber insulation cotton, silicate insulation cotton, silica insulation cotton or insulation cotton of other materials, as long as it can play a role in fireproofing and heat insulation.

[0071] In summary, in the combustion chamber shell of the technical solution of the utility model, by setting a heat insulation layer 3 on the inner wall surface of the frame 1, the heat insulation layer 3 is arranged around the combustion chamber A, so that when the gas water heater is working normally, the heat insulation layer 3 can block the heat in the combustion chamber A from being transferred to the frame 1, reduce the surface temperature of the frame 1, and reduce the heat storage of the frame 1; so that when the gas water heater stops discharging water, the frame 1 with low heat storage will not transfer too much heat to the heat exchanger 5 to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. At least two pressing plates 2 are provided on the side of the heat insulation layer 3 close to the combustion chamber A, and the at least two pressing plates 2 can be fixedly connected to the frame 1 through the fixing member 4, so as to press the heat insulation layer 3 to the inner wall surface of the frame 1, so as to realize the installation limit of the heat insulation layer 3; at the same time, at least two pressing plates 2 can increase the limit position of the heat insulation layer 3, increase the force bearing area of ​​the heat insulation layer 3, and thus improve the assembly reliability of the heat insulation layer 3.

[0072] In order to further improve the assembly reliability of the heat insulation layer 3, in one embodiment of the present application, Figure 2 , Figure 3 , Figure 8 as well as Fig.10 At least two pressing sheets 2 are distributed at intervals on the surface of the heat insulation layer 3 facing the combustion chamber A; each pressing sheet 2 corresponds to at least one fixing piece 4.

[0073] In this embodiment, by distributing at least two pressing sheets 2 at intervals, the force on the heat insulation layer 3 is made more balanced, and the assembly reliability of the heat insulation layer 3 is further improved.

[0074] Each pressing sheet 2 corresponds to at least one fixing member 4 . It can be understood that one pressing sheet 2 can be fixed by one fixing member 4 , or one pressing sheet 2 can be fixed by two or more fixing members 4 .

[0075] In practical applications, the structure of the pressing piece 2 and the structure of the fixing member 4 can be determined according to actual conditions.

[0076] As an example, Figures 2 to 7 , the pressing sheet 2 is a strip pressing sheet; each pressing sheet 2 is fixed to the frame 1 by at least two fixing members 4. In this embodiment, by setting the pressing sheet 2 as a strip pressing sheet, the contact area between the pressing sheet 2 and the heat insulating layer 3 can be increased, so that the heat insulating layer 3 is subjected to a more balanced force. It can be understood that since the strip pressing sheet is long and strip-shaped, in order to make the fixing strength of the strip pressing sheet better, each pressing sheet 2 is fixed to the frame 1 by at least two fixing members 4. Optionally, at least two fixing members 4 are arranged at intervals along the length direction of the strip pressing sheet, so that the strip pressing sheet is subjected to a balanced force, thereby making the pressure distribution on the heat insulating layer 3 more balanced.

[0077] Furthermore, the pressing sheet 2 is extended along the circumferential direction of the combustion chamber A; at least two pressing sheets 2 are arranged on the surface of the heat insulation layer 3 at intervals in the height direction of the combustion chamber A.

[0078] By extending the pressing sheet 2 along the circumference of the combustion chamber A, the contact area between the pressing sheet 2 and the heat insulation layer 3 is further increased, and at the same time, the heat insulation layer 3 on different circumferential walls of the combustion chamber A can be limited by the pressing sheet 2. At least two pressing sheets 2 are arranged at intervals in the height direction of the combustion chamber A, which, on the one hand, increases the contact area between the pressing sheet 2 and the heat insulation layer 3, and on the other hand, makes the stress-bearing parts of the heat insulation layer 3 more and distributed at intervals, further improving the assembly reliability of the heat insulation layer 3 and preventing the heat insulation layer 3 from breaking or falling off.

[0079] It can be understood that in the present embodiment, when the pressing sheet 2 is a strip pressing sheet, the fixing member 4 may include screws and / or clips. When the fixing member 4 is a screw, the screw can be screwed and fixed to the frame 1 by passing the screw through the pressing sheet 2 and the heat insulation layer 3 in sequence. When the fixing member 4 is a clip, the clip can be arranged on the pressing sheet 2 and clipped and fixed to the frame 1, or the clip can be arranged on the frame 1 and clipped and fixed to the pressing sheet 2, or the clip can also be a component independent of the pressing sheet 2 and the frame 1, and the pressing sheet 2 and the frame 1 are clipped together respectively. Alternatively, the fixing member 4 may include screws and clips at the same time, and the strip pressing sheets on the inner wall surfaces of different frames 1 can be fixed by screws and clips respectively. The specific structure and connection method of the fixing member 4 can be determined according to the specific structure of the bottom frame 11, and no limitation is made here.

[0080] As an example, Figures 8 to 10, the pressing piece 2 is a circular gasket, and the fixing piece 4 is a screw. Each pressing piece 2 is fixed to the frame body 11 by a screw. In this embodiment, the circular gasket serves to increase the contact area between the screw and the heat insulation layer 3, preventing the situation where the contact area between the screw and the heat insulation layer 3 is too small, resulting in excessive local stress and damage to the heat insulation layer 3. Optionally, multiple screws and circular gaskets can be provided on different inner wall surfaces of the frame body 11 to make the force on the heat insulation layer 3 more uniform while increasing the contact area.

[0081] In an embodiment of the present application, as Figures 2 to 7 , the frame body 1 includes a bottom frame 11 and a cover plate 12 provided on the bottom frame 11. The cover plate 12 and the bottom frame 11 enclose a combustion chamber A with upper and lower openings; the heat insulation layer 3 includes a first heat insulation layer 31 and a second heat insulation layer 32. The first heat insulation layer 31 is limited to the inner wall surface of the bottom frame 11 by a first pressing piece 21 and a first fixing piece, and the second heat insulation layer 32 is limited to the inner wall surface of the cover plate 12 by a second pressing piece 22 and a second fixing piece.

[0082] In this embodiment, the upper and lower sides of the bottom frame 11 are open for connecting the heat exchanger 5 and the burner 6 respectively. It can be understood that the bottom frame 11 includes a back plate 111 and two side plates 112 provided on opposite sides of the back plate 111. The connection of the two side plates 112 and the back plate 111 makes the cross-sectional shape of the bottom frame 11 generally present an inverted "C" shape. By covering the cover plate 12 at the open end, the inverted "C" shape structure is roughly changed into a cross-sectional shape of a "square", thus forming a combustion chamber A 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, the pressing piece 2, and the fixing piece 4. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, riveting, or other fixing methods.

[0083] During actual assembly, the first heat insulation layer 31 can be first fixed to the inner wall surface of the bottom frame 11, and after the second heat insulation layer 32 is fixed to the inner wall surface of the cover plate 12, the cover plate 12 is then installed on the bottom frame 11. In this way, the inner wall surface of the combustion chamber A is surrounded by the heat insulation layer 3, ensuring the heat insulation effect.

[0084] Specifically, as Figure 2 and Figure 3 , the first heat insulation layer 31 covers the inner wall surfaces of the back plate 111 and the two side plates 112, and is limited to the inner sides of the corresponding back plate 111 and the two side plates 112 by the first pressing piece 21 and the first fixing piece. The first pressing piece 21 is a strip-shaped pressing piece, and the first pressing piece 21 is bent to form three sub-pressing strips 21a to respectively press the first heat insulation layer 31 located on the inner wall surfaces of the back plate 111 and the two side plates 112; the three sub-pressing strips 21a are respectively fixed to the back plate 111 and the two side plates 112 by corresponding first fixing pieces.

[0085] It can be understood that the back plate 111 and the two side plates 112 are respectively connected at an angle, so the back plate 111 and the two side plates 112 are respectively in different planes. Then the first heat insulation layer 31 covering the inner wall surfaces of the back plate 111 and the two side plates 112 is also in different planes. By bending the first pressing piece 21 to form three sub-stripes 21a to respectively press the first heat insulation layer 31 located on the inner wall surfaces of the back plate 111 and the two side plates 112, the first heat insulation layer 31 in different planes can be limited, ensuring the structural reliability of the first heat insulation layer 31. In addition, it should be noted that the first pressing piece 21 in this embodiment is an integral structure, so there is no need to separately set pressing strips for different planes, which simplifies the installation structure and improves the assembly efficiency. Optionally, the first pressing piece 21 can be generally set in a "C" - shaped structure to fit the bottom frame 11 in a "C" - shaped structure. In actual application, the first heat insulation layer 31 can also be set in a "C" - shaped integral structure to match the inner wall surfaces of different plates, so that the connection part between two adjacent plates will also be covered by the first heat insulation layer 31, ensuring the heat insulation ability of the connection part.

[0086] For the convenience of assembly, as Figure 2 and Figure 3 , the first fixing part corresponding to the back plate 111 is a screw, and the screw sequentially passes through the corresponding sub - stripe 21a, the first heat insulation layer 31 and is screwed and fixed to the back plate 111. It can be understood that the back plate 111 is located between the two side plates 112, so the sub - stripe 21a corresponding to the back plate 111 is in the middle position of the three sub - stripes 21a. By directly screwing, the sub - stripe 21a, the first heat insulation layer 31 and the back plate 111 are fixed. Compared with the method of setting a clamping part on the middle sub - stripe 21a, screwing is more convenient to operate and has a higher assembly efficiency.

[0087] It can be understood that the sub - stripes 21a corresponding to the side plates 112 are located on both sides. Then a clamping part can be set at the end of the sub - stripe 21a to be fixed to the corresponding side plate 112, or the sub - stripe 21a can also be fixed to the side plate 112 by screwing. In this embodiment, considering the assembly convenience, the first fixing part corresponding to the side plate 112 is set as a clamping part.

[0088] Specifically, the peripheral edge of the side plate 112 is provided with a side - plate flanging 112a bent towards the combustion chamber A. The side - plate flanging 112a is provided with a first clamping claw 114. The side - plate flanging 112a covers the edge of the first heat insulation layer 31, and the first clamping claw 114 is in limit fit with the surface of the first heat insulation layer 31 facing the combustion chamber A; among them, the first clamping claw 114 located on the side of the side plate 112背离 the back plate 111 is the clamping part for clamping and cooperating with the sub - stripe of the corresponding side plate.

[0089] Note: In the above translation, "背离" is translated as "背离", which is a more literal translation. A more common expression could be "opposite to" or "away from", but to strictly follow the rules and keep the original text's meaning accurately, this literal translation is used here. Also, some parts might need further adjustment according to the specific context for better readability in a real - world scenario.It can be understood that the peripheral edge of the side panel 112 includes an upper edge, a front edge and a lower edge, and a side panel flange 112a is provided at the upper edge, the front edge and the lower edge to support the upper edge, the side edge and the lower edge of the corresponding first heat insulation layer 31, and at the same time, the first heat insulation layer 31 is clamped by the first clamping claw 114 to achieve reliable installation of the first heat insulation layer 31 on the side panel 112. By using the first clamping claw 114 located on the side of the side panel 112 away from the back panel 111 as a clamping member to clamp and fix with the sub-pressing strip 21a of the corresponding side panel 112, the assembly structure can be further simplified without the need for additional special clamping members to fix the sub-pressing strip 21a. Optionally, a slot can be provided at the end of the sub-pressing strip 21a, and the first clamping claw 114 at the side edge of the side panel 112 cooperates with the slot to achieve reliable installation of the sub-pressing strip 21a and the corresponding side panel 112.

[0090] In practical applications, a back plate flange 111a may also be provided on the inner side of the back plate 111 to support the lower edge of the first thermal insulation layer 31. Furthermore, a first clamping claw 114 may also be provided on the back plate flange 111a to increase the limiting area of ​​the first thermal insulation layer 31, thereby increasing the limiting area and further improving the installation reliability of the first thermal insulation layer 31.

[0091] Regarding the assembly of the second thermal insulation layer 32 and the cover plate 12, the second pressing plate 22 plays a role in fixing the second thermal insulation layer 32 arranged on the inner wall surface of the cover plate 12. In actual application, the second pressing plate 22 can be fixed to the cover plate 12 by screwing or clamping parts.

[0092] As an example, Figures 5 to 7 The second pressing piece 22 is a strip-shaped pressing piece; the second fixing member includes a pressing piece flange 22a provided on the second pressing piece 22 and a second clamping claw 22b provided at the end of the pressing piece flange 22a, the pressing piece flange 22a penetrates the second heat insulation layer 32 and the cover plate 12, and the second clamping claw 22b is clamped and fixed to the outer wall surface of the cover plate 12.

[0093] In this embodiment, the pressing sheet flange 22a extends in a direction away from the combustion chamber A, and the second claw 22b is located at the end of the pressing sheet flange 22a away from the combustion chamber A. In actual application, the second claw 22b and the pressing sheet flange 22a are first passed through the second thermal insulation layer 32 and the cover plate 12, and then the second claw 22b is bent and clamped with the outer wall surface of the cover plate 12 to achieve the fixation of the second pressing sheet 22, the second thermal insulation layer 32 and the cover plate 12.

[0094] Optionally, the second pressing sheet 22 may be provided with one, two or more pressing sheet flanges 22a. In practical applications, in order to take into account both assembly reliability and convenience, two pressing sheet flanges 22a may be provided on the second pressing sheet 22, and the two pressing sheet flanges 22a are arranged at intervals. Furthermore, the second clamping claws 22b on the two pressing sheet flanges 22a may be arranged facing each other to achieve a better clamping effect.

[0095] In one embodiment of the present application, Figures 2 to 4 , Fig.11 as well as Fig.13 The bottom frame 11 also includes a first mounting plate 113 extending upward from the top wall of the back plate 111, and the first mounting plate 113 is used to connect with the heat exchanger 5 above the combustion chamber shell; the first insulation layer 31 covers the first mounting plate 113 to separate the first mounting plate 113 from the heat exchanger 5.

[0096] It can be understood that the heat exchanger 5 is mounted on the first mounting plate 113, which is located above the combustion chamber. In this embodiment, by extending the first heat insulation layer 31 to the first mounting plate 113 to separate the first mounting plate 113 and the heat exchanger 5, the heat transfer between the first mounting plate 113 and the heat exchanger 5 can be isolated, and when the water supply is stopped, the heat of the first mounting plate 113 can be prevented from being transferred to the heat exchanger 5 to cause the water supply to stop and the temperature rise.

[0097] In addition, it should be noted that when the user turns off the water midway, the fan 7 has a post-cleaning action (after the burner stops burning, the fan 7 still runs for a preset period of time to discharge the smoke in the combustion chamber. Optionally, the preset time can be about one minute). This action can draw cold air from the outside to cool the first insulation layer 31 and the fins of the heat exchanger 5, but the cooling effect on the bottom frame 11 is limited. Then, the temperature of the bottom frame 11 may be higher than the temperature of the fins of the heat exchanger 5. This embodiment extends the first insulation layer 31 upward to the heat exchanger 5 and isolates the first mounting plate 113 from the heat exchanger 5. This can effectively prevent the higher temperature bottom frame 11 from transferring its own heat to the heat exchanger 5 after the water is turned off.

[0098] In one embodiment of the present application, Figure 6 , Fig.10 , Fig.11 as well as Fig.13 The top wall of the cover plate 12 extends upward to form a second mounting plate 121, which is arranged opposite to the first mounting plate 113, and the heat exchanger 5 is installed between the first mounting plate 113 and the second mounting plate 121. The second heat insulation layer 32 installed on the cover plate 12 extends to the second mounting plate 121 to separate the second mounting plate 121 from the heat exchanger 5 to prevent heat transfer between the two.

[0099] During actual installation, the first heat insulation layer 31 is first installed on the inner wall of the bottom frame 11, and then the heat exchanger 5 is installed on the first mounting plate 113, so that the heat exchanger 5 and the first mounting plate 113 clamp the first heat insulation layer 31 therebetween. At the same time, the second heat insulation layer 32 is installed on the inner wall of the cover plate 12, and then the cover plate 12 with the second heat insulation layer 32 is placed on the bottom frame 11, so that the second mounting plate 121 and the heat exchanger 5 clamp the second heat insulation layer 32 therebetween.

[0100] In order to further improve the heat insulation effect, in one embodiment, Figure 2 , Figure 4 , Fig.11 as well as Fig.13 The frame 1 is provided with at least two convex bumps 101 facing the combustion chamber A, and the convex bumps 101 abut against the heat insulation layer 3 to form an air gap B between the heat insulation layer 3 and the frame 11 .

[0101] By providing at least two convex bumps 101 on the frame 1, the convex bumps 101 can lift up the heat insulation layer 3 so that an air gap B is formed between the heat insulation layer 3 and the inner wall surface of the frame 1, thereby providing heat insulation between the heat insulation layer 3 and the frame 1. Furthermore, a plurality of air vents 102 are provided on the frame 11, and external cold air can enter the air gap B through the air vents 102, taking away more heat, and further improving the heat insulation effect of the heat insulation layer 3 on the frame 1. In actual applications, the number of convex bumps 101 can be determined according to actual conditions, and is not limited here. Optionally, the convex bumps 101 can be manufactured using a stamping process.

[0102] In one embodiment, the fixing member 4 includes a screw, and a mounting hole 101 a is provided at the convex portion 101 . The screw passes through the pressing sheet 2 and the heat insulating layer 3 and is screwed into the mounting hole 101 a .

[0103] In this embodiment, the pressing sheet 2, the heat insulating layer 3 and the frame 1 are fixed by screwing. A mounting hole 101a is provided at the convex bump 101, and the convex bump 101 can play a role in positioning the screw. When the screw is installed, the convex bump 101 can also form an avoidance groove for screw installation, so that the outer end of the screw will not protrude from the outer surface of the frame 1, making the appearance of the frame 1 smoother, and at the same time will not interfere with the casing of the gas water heater. In actual application, the mounting holes 101a can be provided on only a few of the convex bumps 101 to assemble the screws, as long as it can be ensured that the heat insulating layer 3 does not fall off.

[0104] As an example, the screw can be a self-tapping screw, which can be fixedly connected to the frame 1 without the need for additional nut or other structures. The self-tapping screw includes a head and a tip. During actual installation, the tip passes through the pressing sheet 2, the heat insulation layer 3 and the mounting hole 101a in sequence until the head abuts against the pressing sheet 2. Furthermore, the tip is located in the depression formed by the convex bump 101 toward the outer wall surface. Such an arrangement can not only ensure the reliable installation of the pressing sheet 2, the heat insulation layer 3 and the frame 1, but also make the appearance of the frame 1 smoother.

[0105] In one embodiment of the present application, the thermal insulation layer 3 can use flexible thermal insulation cotton of silicate fiber or silica fiber or glass fiber. As an example, the flexible thermal insulation cotton uses low-density aluminum silicate fiber cotton, and 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, and 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 flexible thermal insulation cotton is 0.128g / cm3 to achieve a better effect of reducing the heat storage.

[0106] In one embodiment, the specific heat capacity C of the flexible thermal insulation cotton is between 0.3 J / (gK) and 1.5 J / (gK). The specific heat capacity is the amount of heat absorbed or released when a unit mass of an object changes unit temperature. Specifically in this embodiment, the amount of heat required to raise the temperature of 1 gram of flexible thermal insulation cotton by 1°C is between 0.3 joules and 1.5 joules, thereby ensuring good thermal insulation while reducing thermal conductivity. In order to further enhance the thermal insulation effect, preferably, the specific heat capacity C of the flexible thermal insulation cotton is between 1.0 J / (gK) and 1.3 J / (gK). Furthermore, it is preferred that the specific heat capacity C of the flexible thermal insulation cotton is between 1.0 J / (gK) and 1.1 J / (gK).

[0107] Furthermore, the flexible thermal insulation cotton has a porous structure; the surface where the flexible thermal insulation cotton contacts the inner wall of the frame 1 is concave-convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the inner wall of the frame 1 (not shown).

[0108] It is understandable that the density of the flexible thermal insulation cotton is lower than that of the cardboard structure, so at the same volume, the mass of the flexible thermal insulation cotton is lower, and the heat storage capacity is also lower. The internal structure of the flexible thermal insulation cotton is relatively fluffy and porous, and the surface of the flexible thermal insulation cotton is uneven. When the flexible thermal insulation cotton is installed on the inner wall of the frame 1, some irregular gas microchannels will be formed between the flexible thermal insulation cotton and the inner wall of the frame 1. The gas microchannel can isolate the flexible thermal insulation cotton from the frame 1 on the one hand, and can also absorb and reduce noise on the other hand.

[0109] The utility model also provides a gas water heater, such as Figures 11 to 13 The gas water heater comprises a burner 6, a heat exchanger 5, a fan 7 and a combustion chamber shell. The specific structure of the combustion chamber shell is referred to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the heat exchanger 5 is arranged above the combustion chamber shell, and the burner 6 is arranged below the combustion chamber shell.

[0110] It can be understood that the type of the gas water heater can be a forced-draft water heater, in which case the fan 7 is arranged above the heat exchanger 5 to drive the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 7 is arranged below the burner 6 to drive the airflow by blowing air.

[0111] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, the inner cavity of which forms a combustion chamber; A heat insulation layer is arranged on the inner wall surface of the frame and surrounds the combustion chamber; At least two pressing sheets are arranged on a side of the heat insulation layer close to the combustion chamber; as well as At least two fixing members are used to fixedly connect the pressing sheet and the frame to limit the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that At least two of the pressing sheets are spaced apart and distributed on the surface of the heat insulation layer facing the combustion chamber; Each of the pressing sheets corresponds to at least one of the fixing members.

3. The combustion chamber housing according to claim 2, characterized in that The pressing sheet is a strip-shaped pressing sheet; each of the pressing sheets is fixed to the frame body by at least two fixing members.

4. The combustion chamber housing according to claim 3, characterized in that The pressing sheet is extended along the circumference of the combustion chamber; At least two of the pressing sheets are arranged on the surface of the heat insulation layer at intervals along the height direction of the combustion chamber.

5. The combustion chamber housing according to claim 3, characterized in that The fixing member comprises a screw, and the screw passes through the pressing sheet, the heat insulation layer and the frame body in sequence and is screwed and fixed; And / or, the fixing member includes a clamping member, and the pressing sheet is clamped and fixed to the frame through the clamping member to limit the thermal insulation layer.

6. The combustion chamber housing according to any one of claims 1 to 5, characterized in that The frame body comprises a bottom frame and a cover plate arranged on the bottom frame, wherein the cover plate and the bottom frame are combined to form the combustion chamber having upper and lower openings; The thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer. The first thermal insulation layer is limited to the inner wall surface of the bottom frame by a first pressing sheet and a first fixing member, and the second thermal insulation layer is limited to the inner wall surface of the cover plate by a second pressing sheet and a second fixing member.

7. The combustion chamber housing according to claim 6, characterized in that The bottom frame includes a back plate and two side plates arranged on opposite sides of the back plate, and the first heat insulation layer covers the inner wall surfaces of the back plate and the two side plates; The first pressing sheet is a strip-shaped pressing sheet, and the first pressing sheet is bent to form three sections of pressing strips, so as to respectively press the first heat insulation layer located on the inner wall surfaces of the back plate and the two side plates; The three sections of the press strips are respectively fixed to the back panel and the two side panels through the corresponding first fixing members.

8. The combustion chamber housing according to claim 7, characterized in that The first fixing member corresponding to the back plate is a screw, and the screw passes through the corresponding sub-pressing strip, the first heat insulation layer and the back plate in sequence and is screwed and fixed; The first fixing member corresponding to the side plate is a clamping member.

9. The combustion chamber housing according to claim 8, characterized in that The peripheral edge of the side plate is provided with a side plate flange bent toward the combustion chamber, the side plate flange is provided with a first claw, the side plate flange covers the edge of the first heat insulation layer, and the first claw is limitedly matched with the surface of the first heat insulation layer facing the combustion chamber; Wherein, the first clamping claw located at the side of the side panel away from the back panel is the clamping member, so as to be clamped and matched with the sub-pressing strip corresponding to the side panel.

10. The combustion chamber housing according to claim 6, characterized in that The second pressed tablet is a strip-shaped pressed tablet; The second fixing member includes a pressing plate flange provided on the second pressing plate and a second clamping claw provided at the end of the pressing plate flange, the pressing plate flange penetrates the second heat insulation layer and the cover plate, and the second clamping claw is clamped and fixed to the outer wall surface of the cover plate.

11. The combustion chamber housing according to claim 1 or 2, characterized in that: The pressing sheet is a circular gasket, the fixing piece is a screw, and each pressing sheet is fixed to the frame body by a screw.

12. The combustion chamber housing according to claim 1, characterized in that The frame body is provided with at least two convex humps toward the combustion chamber, and the convex humps abut against the heat insulation layer to form an air gap between the heat insulation layer and the frame body; The fixing member comprises a screw, and a mounting hole is arranged at the convex portion. The screw passes through the pressing sheet and the heat insulation layer and is screwed to the mounting hole.

13. The combustion chamber housing according to claim 12, characterized in that The screw is a self-tapping screw, which includes a head and a tip, wherein the tip is located in a recess formed by the convex bump toward the outer wall surface.

14. The combustion chamber housing according to any one of claims 1 to 5, characterized in that The heat insulation layer is flexible heat insulation cotton.

15. The combustion chamber housing according to claim 14, characterized in that The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber; The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

16. The combustion chamber housing according to claim 14, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

17. The combustion chamber housing according to claim 16, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0 J / (gK)≤C≤1.3 J / (gK).

18. The combustion chamber housing according to claim 14, characterized in that The surface of the flexible heat-insulating cotton facing the inner wall surface of the frame body is concave-convex, so that a plurality of irregular gas microchannels are provided between the flexible heat-insulating cotton and the inner wall surface of the frame body.

19. 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 18, 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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