Combustion chamber shell and gas water heater

Abstract

The utility model discloses a combustion chamber shell and a gas water heater, and relates to the technical field of gas equipment. Wherein the combustion chamber shell comprises a frame body, a heat insulation layer and at least two pressing 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 distributed on one side, close to the combustion chamber, of the heat-insulating layer at intervals; the pressing piece and the frame body are clamped and fixed to limit the heat insulation layer. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the reliability of the heat insulation layer is improved.

Description

Technical Field

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

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

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

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

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

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

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

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

[0009] At least two pressing sheets are spaced and distributed on a side of the heat insulation layer close to the combustion chamber; the pressing sheets are clamped and fixed to the frame to limit the heat insulation layer.

[0010] In one embodiment of the present application, the tabletting comprises:

[0011] A pressing portion is provided on a surface of the heat insulation layer close to the combustion chamber; and

[0012] The clamping part has one end connected to the pressing part and the other end passing through the heat insulation layer to be clamped and fixed with the frame.

[0013] In one embodiment of the present application, the frame is provided with a slot running through its inner and outer walls, and a hook is provided at one end of the clamping portion away from the pressing portion; the clamping portion passes through the insulation layer and the slot in sequence so that the hook is clamped and limited with the outer wall of the frame.

[0014] In one embodiment of the present application, the pressing portion is provided with a hollow hole.

[0015] In an embodiment of the present application, the pressing piece is a one-piece metal part.

[0016] In an embodiment of the present application, at least two of the pressing pieces are arranged at intervals along the circumferential direction of the frame body;

[0017] And / or, at least two of the pressing pieces are distributed at the middle position in the height direction of the combustion chamber.

[0018] In an embodiment of the present application, the frame body includes a bottom frame and a cover plate arranged on the bottom frame, and the cover plate and the bottom frame enclose to form the combustion chamber with upper and lower openings;

[0019] The heat insulation layer includes a first heat insulation layer and a second heat insulation layer. The first heat insulation layer is fixed to the inner wall surface of the bottom frame by at least two of the pressing pieces, and the second heat insulation layer is fixed to the inner wall surface of the cover plate by at least two of the pressing pieces.

[0020] In an 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 number of the pressing pieces corresponding to the back plate is at least two, and / or the number of the pressing pieces corresponding to the side plates is at least one.

[0022] In an embodiment of the present application, the peripheral edge of the side plate is provided with a side plate flanging bent towards the combustion chamber, and the inner side of the back plate is provided with a back plate flanging bent towards the combustion chamber. The side plate flanging and the back plate flanging cover the edge of the first heat insulation layer;

[0023] The side plate flanging and / or the back plate flanging are / is provided with clamping claws, and the clamping claws are in limit fit with the surface of the first heat insulation layer facing the combustion chamber.

[0024] In an embodiment of the present application, the heat insulation layer is a flexible heat insulation cotton.

[0025] In an embodiment of the present application, the flexible heat insulation cotton is silicate fiber or silica fiber or glass fiber;

[0026] The density of the flexible heat insulation cotton is less than 0.2 g / cm3.

[0027] To achieve the above object, the present application further provides a gas water heater, which includes 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;

[0028] The blower is arranged above the heat exchanger, or the blower is arranged below the burner.

[0029] In the combustion chamber housing of the technical solution of the present utility model, a heat insulation layer is provided on the inner wall surface of the frame body. The heat insulation layer surrounds the combustion chamber, so that when the gas water heater is discharging water normally, the heat insulation layer can block the heat transfer from 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 water temperature rise when stopping. At least two pressing pieces are provided on the side of the heat insulation layer close to the combustion chamber. The at least two pressing pieces are clamped and fixed to the frame body to press the heat insulation layer to the inner wall surface of the frame body, realizing the installation and limitation of the heat insulation layer. At the same time, the at least two pressing pieces can increase the limiting parts of the heat insulation layer and increase the stress area of the heat insulation layer, thereby improving the assembly reliability of the heat insulation layer. On the other hand, by limiting the heat insulation layer with the pressing pieces distributed at intervals, compared with the full-coverage fixing plate structure, the heat storage capacity can be reduced, and the improvement effect on the water temperature rise when stopping can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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.

[0031] Figure 1 is a schematic structural diagram of an embodiment of the combustion chamber housing of the present utility model;

[0032] Figure 2 is an assembly schematic diagram of a bottom frame, a heat insulation layer, and a pressing piece in an embodiment of the present utility model;

[0033] Figure 3 is Figure 2 an exploded schematic diagram of an embodiment;

[0034] Figure 4 is a schematic structural diagram of the bottom frame in an embodiment of the present utility model;

[0035] Figure 5 is an assembly schematic diagram of a cover plate, a heat insulation layer, and a pressing piece in an embodiment of the present utility model;

[0036] Figure 6 is Figure 5 an exploded schematic diagram of an embodiment;

[0037] Figure 7 is a schematic structural diagram of the pressing piece in an embodiment of the present utility model;

[0038] Figure 8 This is a partial structural schematic diagram of the gas water heater of the present utility model;

[0039] Figure 9 This is a schematic diagram of the structural cooperation of the combustion chamber, heat exchanger and heat insulation layer in the embodiment of the present utility model.

[0040] Explanation of the reference numerals in the drawings:

[0041] Label Name Label Name 1 Frame 2 Pressing piece 101 Card slot 21 Pressing part 11 Bottom frame 211 Hollow hole 111 Back panel 22 Clamping part 111a Back panel flange 221 Hook 112 Side panel 3 Heat insulation layer 112a Side panel flange 31 First heat insulation layer 113 First mounting plate 32 Second heat insulation layer 114 Claw 4 Heat exchanger 12 Cover plate 5 Burner 121 Second mounting plate 6 Fan

[0042] The realization of the object, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0043] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0044] 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.

[0045] 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.

[0046] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. 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.

[0047] 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 housing 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 housing of the combustion chamber. At the same time, when the user turns off the water during the water use process, the water in the heat exchanger does not flow. The heat accumulated in the housing of the combustion chamber and the fins of the heat exchanger 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 turns on 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 shutdown. In the related art, a heat insulation layer is provided on the inner wall of the housing of the combustion chamber to insulate and cool down, so as to improve the problem of water temperature rise during shutdown. However, when the device collides or drops during transportation or handling, it is easy to cause damage to the heat insulation layer or the heat insulation layer to fall off from the housing of the combustion chamber.

[0048] Based on this, the present utility model proposes a housing of a combustion chamber, which is applied to a gas water heater, aiming to be able to reduce the surface temperature of the housing of the combustion chamber and the water temperature rise during shutdown, and at the same time improve the assembly reliability of the heat insulation layer 3. It can be understood that, as Figure 1 , Figure 8 and Figure 9 , the gas water heater includes a housing of a combustion chamber, a heat exchanger 4, a burner 5 and a blower 6. A combustion chamber that penetrates up and down is formed inside the housing of the combustion chamber. The heat exchanger 4 is arranged above the housing of the combustion chamber, and the burner 5 is located below the housing of the combustion chamber. The burner 5 plays a role in ignition and combustion. 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 6 plays a role in driving gas and air into the combustion chamber for combustion, transporting the high-temperature flue gas after combustion to the heat exchanger 4 for heat exchange, and then discharging the exhaust gas after heat exchange. The structure of the housing of the combustion chamber will be described below by way of embodiments.

[0049] As Figures 1 to 6 shown, the housing of the combustion chamber includes a frame body 1, a heat insulation layer 3 and at least two pressing pieces 2.

[0050] A combustion chamber is formed in the inner cavity of the frame body 1; the heat insulation layer 3 is arranged on the inner wall surface of the frame body 1 and surrounds the periphery of the combustion chamber; at least two pressing pieces 2 are distributed at intervals on the side of the heat insulation layer 3 close to the combustion chamber; the pressing pieces 2 are fixedly connected to the frame body 1 to limit the heat insulation layer 3.

[0051] In this embodiment, the inner cavity of the housing 1 forms a combustion chamber. By providing a heat insulation layer 3 on the inner wall surface of the housing 1, the heat insulation layer 3 surrounds the combustion chamber A, which can play a role in isolating the high-temperature flue gas from the housing 1, preventing the heat in the combustion chamber A from being transferred to the housing 1, and achieving the purpose of reducing the surface temperature of the housing 1. At the same time, since the heat insulation layer 3 isolates the heat transfer to the housing 1, the heat storage capacity of the housing 1 is reduced. Therefore, when the user stops using water, the housing 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 temperature rise during the stop of water supply can be effectively improved.

[0052] By providing at least two pressing pieces 2 on the side of the heat insulation layer 3 close to the combustion chamber A, the at least two pressing pieces 2 can be fixedly clamped with the housing 1, so that the at least two pressing pieces 2 can press the heat insulation layer 3 against the inner wall surface of the housing 1. In this way, the installation and limiting function of the heat insulation layer 3 is realized.

[0053] It should be noted that in this embodiment, by using at least two pressing pieces 2 to limit the heat insulation layer 3, the number of force-bearing positions of the heat insulation layer 3 is increased. Compared with only using the method of screwing, the force-bearing area of the heat insulation layer 3 is increased, which can improve the assembly reliability of the heat insulation layer 3. At the same time, in this embodiment, at least two pressing pieces 2 are arranged at intervals. Therefore, compared with using a fully enclosed fixing plate, the contact area with the combustion chamber can be reduced, the heat storage capacity can be reduced, and it is more beneficial to improve the temperature rise during the stop of water supply.

[0054] In addition, in this embodiment, the heat insulation layer 3 is limited by the clamping and fixing of the pressing piece 2 and the housing 1. Compared with the related art that requires an additional dedicated fixing structure such as screws and magnetic components, this embodiment does not require an additional fixing structure, achieving the purpose of simplifying the installation structure and saving material costs.

[0055] In actual application, the number of pressing pieces 2 can be determined according to the actual situation. For example, it can be two, three or more. The shape and structure of the pressing piece 2 can also be determined according to the actual situation. For example, it can be an oval, a circle, a rectangle, a triangle, a square or other special-shaped structures, etc.

[0056] Optionally, the pressing piece 2 can be made of a metal material with relatively high heat resistance, such as a sheet metal part or stainless steel, etc.

[0057] In actual application, 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 A, or can also be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulation layer 3 at least surrounds the combustion chamber A. It can be understood that the heat insulation layer 3 only surrounds the combustion chamber A, or in addition to the combustion chamber A, the heat insulation layer 3 can also be provided in other parts, such as the heat exchanger 4, the flue, etc.

[0058] 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, which has the characteristics of flexibility and heat insulation. Compared with the way of using rigid heat insulation boards for heat insulation in the related art, the density of the flexible heat insulation cotton in this embodiment is lower. Then, under the same volume, the mass of this flexible heat insulation cotton is lower, so the heat storage capacity will also be lower, which can reduce the overall heat storage capacity of the combustion chamber housing and effectively improve the temperature rise when the water stops flowing. In addition, the flexible and fluffy characteristics of the flexible heat insulation cotton, such as its flexibility and cotton texture, can also play a role in buffering and sound absorption, achieving the effect of noise reduction, without the need to additionally set up vibration damping 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.

[0059] In summary, in the combustion chamber housing of the technical solution of the present utility model, by arranging the heat insulation layer 3 on the inner wall surface of the frame body 1, and the heat insulation layer 3 surrounds the combustion chamber A. When the gas water heater is working with normal water output, the heat insulation layer 3 can block the heat transfer from the combustion chamber A 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 when the water stops flowing. At least two pressing pieces 2 are arranged on one side of the heat insulation layer 3 close to the combustion chamber A, and the at least two pressing pieces 2 are clamped and fixed with the frame body 1 to press the heat insulation layer 3 to the inner wall surface of the frame body 1, realizing the installation limit of the heat insulation layer 3. At the same time, the at least two pressing pieces 2 can increase the limiting parts of the heat insulation layer 3 and increase the stress area of the heat insulation layer 3, thereby improving the assembly reliability of the heat insulation layer 3. On the other hand, by limiting the heat insulation layer 3 through the pressing pieces 2 distributed at intervals, compared with the full-coverage fixing plate structure, the heat storage capacity can be reduced, and the improvement effect on the temperature rise when the water stops flowing can be further enhanced.

[0060] In order to further improve the assembly reliability of the heat insulation layer 3, as Figures 1 to 6 , in an embodiment of the present application, at least two pressing pieces 2 are arranged at intervals along the circumferential direction of the frame body 1.

[0061] In this embodiment, by arranging at least two pressing pieces 2 at intervals along the circumferential direction of the frame body 1, the limiting positions of the pressing pieces 2 and the heat insulation layer 3 are further increased. At the same time, the heat insulation layer 3 on different circumferential wall surfaces of the combustion chamber A can be limited by the pressing pieces 2, making the stress of the heat insulation layer 3 more balanced and further improving the assembly reliability of the heat insulation layer 3.

[0062] In one embodiment of the present application, at least two pressing sheets 2 are distributed in the middle position of the combustion chamber in the height direction.

[0063] In this embodiment, by distributing at least two pressing sheets 2 in the middle position in the height direction of the combustion chamber, it is possible to prevent the thermal insulation layer 3 from being damaged due to uneven force distribution, thereby further improving the reliability of limiting the thermal insulation layer 3.

[0064] It should be noted that, in actual application, the arrangement of the at least two pressing tablets 2 may not be limited to the above-mentioned embodiments, and the at least two pressing tablets 2 may be distributed in a rectangular array or a circular array, or the at least two pressing tablets 2 may be arranged irregularly and randomly, etc.

[0065] In one embodiment of the present application, Figures 2 to 7 The pressing sheet 2 includes a pressing portion 21 and a clamping portion 22. The pressing portion 21 is arranged on the surface of the heat insulation layer 3 close to the combustion chamber; one end of the clamping portion 22 is connected to the pressing portion 21, and the other end passes through the heat insulation layer 3 to be clamped and fixed with the frame 1.

[0066] This embodiment illustrates the structure of the pressing sheet 2, where the pressing portion 21 is located on the surface of the thermal insulation layer 3 close to the combustion chamber, and is used to support and limit the thermal insulation layer 3; the clamping portion 22 is connected to the pressing portion 21 at an angle, and the clamping portion 22 passes through the thermal insulation layer 3 and is clamped and fixed to the frame 1 to play the role of fixing and limiting the pressing portion 21, so that the pressing portion 21 can press the thermal insulation layer 3 toward the frame 1 to limit the position.

[0067] It is understandable that the structure for fixing the snap-fitting portion 22 to the frame 1 can be determined according to actual conditions. For example, a snap-fitting member that cooperates with the snap-fitting portion 22 can be provided in the frame 1, or a slot 101 structure that cooperates with the snap-fitting portion 22 can be provided on the frame 1, etc.

[0068] Considering the assembly efficiency, as an example, the frame 1 is provided with a slot 101 that passes through its inner and outer walls, and a hook 221 is provided at one end of the clamping portion 22 that is away from the pressing portion 21; the clamping portion 22 passes through the heat insulating layer 3 and the slot 101 in sequence, so that the hook 221 is clamped and limited with the outer wall of the frame 1. It can be understood that the hook 221 can be formed by folding the edge of the clamping portion 22. During assembly, the clamping portion 22 is first passed through the heat insulating layer 3 and the slot 101, and then the end of the clamping portion 22 is folded to form the hook 221 to abut against the outer wall of the frame 1, thereby realizing the assembly of the pressing sheet 2, the heat insulating layer 3 and the frame 1. Such a design can simplify the assembly structure of the frame 1 and the clamping portion 22, without the need for additional screwing operations, thereby improving assembly efficiency.

[0069] Furthermore, the pressing plate 2 is an integrated metal piece, which simplifies the structure and improves the heat resistance. Optionally, the pressing plate 2 is a sheet metal piece or a stainless steel piece.

[0070] In practical applications, the shape and structure of the pressing portion 21 can be determined according to actual conditions, for example, the outer contour of the pressing portion 21 is oval, rectangular, circular, triangular or some other shapes. In this embodiment, considering the structural reliability of the heat insulating layer 3, the outer contour of the pressing portion 21 can be set to a smooth shape, such as a circle, an oval or a waist shape, to prevent the corner structure from puncturing and damaging the heat insulating layer 3 during assembly.

[0071] In order to further optimize the improvement of water-off temperature rise, such as Figure 7 The pressing part 21 is provided with a hollow hole 211. Such a configuration can reduce the contact area between the pressing part 21 and the combustion chamber, thereby reducing the heat storage amount and reducing the heat transfer to the frame 1, thereby better improving the water-off temperature rise.

[0072] In one embodiment of the present application, Figures 1 to 6 The frame body 1 includes a bottom frame 11 and a cover plate 12 arranged on the bottom frame 11, and the cover plate 12 and the bottom frame 11 enclose a combustion chamber with upper and lower openings; the thermal insulation layer 3 includes a first thermal insulation layer 31 and a second thermal insulation layer 32, the first thermal insulation layer 31 is fixed to the inner wall surface of the bottom frame 11 by at least two pressing sheets 2, and the second thermal insulation layer 32 is fixed to the inner wall surface of the cover plate 12 by at least two pressing sheets 2.

[0073] In this embodiment, the upper and lower sides of the bottom frame 11 are open to connect the heat exchanger 4 and the burner 5 respectively. It can be understood that the bottom frame 11 includes a back plate 111 and two side plates 112 arranged on opposite sides of the back plate 111. The connection between the two side plates 112 and the back plate 111 makes the cross-sectional shape of the bottom frame 11 roughly present a "匚" shape. By covering the cover plate 12 at the open part, the "匚"-shaped structure is roughly changed into a "口"-shaped cross-sectional shape, thereby forming a combustion chamber A with upper and lower openings and closed all around. 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 structures such as the insulation layer 3, the pressing sheet 2 and other components. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, riveted or other fixing methods.

[0074] During actual assembly, the first insulation layer 31 can be fixed to the inner wall surface of the bottom frame 11, and the second insulation layer 32 can be fixed to the inner wall surface of the cover plate 12, and then the cover plate 12 can be installed on the bottom frame 11. In this way, the inner wall surface of the combustion chamber A can be surrounded by the insulation layer 3 to ensure the insulation effect.

[0075] Specifically, Figures 2 to 4 The first heat insulation layer 31 covers the inner wall surfaces of the back plate 111 and the two side plates 112; the number of pressing sheets 2 corresponding to the back plate 111 is at least two, and / or the number of pressing sheets 2 corresponding to the side plates 112 is at least one.

[0076] It can be understood that the back plate 111 and the two side plates 112 are respectively connected at an included angle, so the back plate 111 and the two side plates 112 are respectively in different planes. Then, the first heat insulation layer 31 covering the inner wall surfaces of the back plate 111 and the two side plates 112 is also respectively in different planes. Considering that the area of the back plate 111 is larger than that of the side plate 112, in this embodiment, the number of pressing plates 2 corresponding to the back plate 111 is set to at least two, and the number of pressing plates 2 corresponding to the side plate 112 is set to at least one, so that the first heat insulation layer 31 in different planes can be limited, ensuring the structural reliability of the first heat insulation layer 31. In actual application, the first heat insulation layer 31 can be set as a "C"-shaped integral structure to match the inner wall surfaces of different plates, so that the connection part between two adjacent plates is also covered by the first heat insulation layer 31, ensuring the heat insulation ability of the connection part.

[0077] Further, the peripheral edge of the side plate 112 is provided with a side plate flange 112a bent towards the combustion chamber, and the inner side of the back plate 111 is provided with a back plate flange 111a bent towards the combustion chamber. The side plate flange 112a and the back plate flange 111a cover the edge of the first heat insulation layer 31; the side plate flange 112a and / or the back plate flange 111a are provided with claws 114, and the claws 114 are in limiting fit with the surface of the first heat insulation layer 31 facing the combustion chamber.

[0078] In this embodiment, the peripheral edge of the side plate 112 includes an upper edge, a front edge and a lower edge. The side plate flange 112a is provided on the upper edge, the front edge and the lower edge to support the upper edge, the side edge and the lower edge of the corresponding first heat insulation layer 31, making the installation of the first heat insulation layer 31 corresponding to the side plate 112 more reliable. The back plate flange 111a can also be provided on the inner side of the back plate 111 to support the lower edge of the first heat insulation layer 31. Then, the claw 114 can be provided on at least one of the back plate flange 111a and the side plate flange 112a to limit the first heat insulation layer 31. It can be understood that the claw 114 can be provided on the single back plate flange 111a, or on the single side plate flange 112a, or on both the back plate flange 111a and the side plate flange 112a.

[0079] As an example, claws 114 are provided on both the back plate flange 111a and the side plate flange 112a to increase the limiting area of the first heat insulation layer 31 and increase the limiting area, which can further improve the installation reliability of the first heat insulation layer 31.

[0080] Regarding the assembly between the second heat insulation layer 32 and the cover plate 12, as Figure 5 and Figure 6 , in actual application, at least two pressing plates 2 can be provided corresponding to the cover plate 12, and the at least two pressing plates 2 are clamped and fixed with the cover plate 12 to realize the limiting installation of the second heat insulation layer 32.

[0081] In an embodiment of the present application, as Figures 1 to 4 , the bottom frame 11 further includes a first mounting plate 113 extending upward from the top wall of the back plate 111. The first mounting plate 113 is used to connect to the heat exchanger 4 above the combustion chamber housing. The first heat insulation layer 31 covers the first mounting plate 113 to separate the first mounting plate 113 from the heat exchanger 4.

[0082] It can be understood that the heat exchanger 4 is mounted on the first mounting plate 113, which is located above the combustion chamber. In this embodiment, by extending the first heat insulation layer 31 to the first mounting plate 113 to separate the first mounting plate 113 from the heat exchanger 4, the heat transfer between the first mounting plate 113 and the heat exchanger 4 can be isolated. When the water output stops, it can prevent the heat of the first mounting plate 113 from being transferred to the heat exchanger 4, resulting in the situation of water stop temperature rise.

[0083] In addition, it should be noted that when the user turns off the water midway, the fan 6 has a post-purge action (after the burner 5 stops burning, the fan 6 still runs for a preset time to discharge the flue gas in the combustion chamber. Optionally, the preset time can be about one minute). This action can extract external cold air to cool the first heat insulation layer 31 and the fins of the heat exchanger 4, but the cooling effect on the bottom frame 11 is limited. Then, it may occur that the temperature of the bottom frame 11 is higher than the temperature of the fins of the heat exchanger 4. In this embodiment, by extending the first heat insulation layer 31 upward to the heat exchanger 4 to isolate the first mounting plate 113 from the heat exchanger 4, it can effectively prevent the higher-temperature bottom frame 11 from conducting its own heat to the heat exchanger 4 after the water supply stops.

[0084] In an embodiment of the present application, as Figure 1 , Figure 5 and Figure 6 , the top wall of the cover plate 12 extends upward to form a second mounting plate 121. The second mounting plate 121 is disposed opposite to the first mounting plate 113, and the heat exchanger 4 is mounted between the first mounting plate 113 and the second mounting plate 121. The second heat insulation layer 32 mounted on the cover plate 12 extends to the second mounting plate 121 to separate the second mounting plate 121 from the heat exchanger 4 and prevent heat transfer between the two.

[0085] During actual installation, first install the first heat insulation layer 31 on the inner wall of the bottom frame 11, and then install the heat exchanger 4 on the first mounting plate 113, so that the heat exchanger 4 and the first mounting plate 113 clamp and fix the first heat insulation layer 31 therebetween. At the same time, install the second heat insulation layer 32 on the inner wall of the cover plate 12, and then cover the cover plate 12 with the second heat insulation layer 32 on the bottom frame 11, so that the second mounting plate 121 and the heat exchanger 4 clamp and fix the second heat insulation layer 32 therebetween.

[0086] In an embodiment of the present application, the heat insulation layer 3 may adopt a flexible heat insulation cotton made of silicate fiber, silica fiber or glass fiber. Exemplarily, the flexible heat insulation cotton is made of aluminum silicate fiber cotton with a relatively low density. The density of the aluminum silicate cotton is less than 0.2 g / cm³ for the first heat insulation layer 313, which is much lower than the density of conventional rigid heat insulation materials such as aluminum silicate board at 0.36 g / cm³ for the first heat insulation layer 313, and also much lower than the density of stainless steel at 7.93 g / cm³ used in the air-cooling mode for the first heat insulation layer 313. Thus, in the same volume, this embodiment can greatly reduce the heat storage capacity and effectively reduce the temperature rise after the water stops. Preferably, the density of the flexible heat insulation cotton is 0.128 g / cm³ for the first heat insulation layer 313 to achieve a better effect of reducing the heat storage capacity.

[0087] In an embodiment, the specific heat capacity C of the flexible heat insulation cotton is between 0.3 J / (g·K) and 1.5 J / (g·K). The specific heat capacity is the amount of heat absorbed or released when a unit mass of an object changes its unit temperature. Specifically in this embodiment, the amount of heat required for 1 gram of the flexible heat insulation cotton to increase its temperature by 1 °C is between 0.3 joules and 1.5 joules, which ensures a good heat insulation effect while reducing the thermal conductivity. To further improve the heat insulation effect, preferably, the specific heat capacity C of the flexible heat insulation cotton is between 1.0 J / (g·K) and 1.3 J / (g·K). Further still, preferably, the specific heat capacity C of the flexible heat insulation cotton is between 1.0 J / (g·K) and 1.1 J / (g·K).

[0088] Furthermore, the flexible heat insulation cotton has a porous structure; the surface of the flexible heat insulation cotton in contact with the inner wall surface of the frame 1 is concave-convex, so that there are a plurality of irregular gas micro-channels (not shown in the figure) between the flexible heat insulation cotton and the inner wall surface of the frame 1.

[0089] It can be understood that compared with the cardboard body structure, the flexible heat insulation cotton has a lower density. Then, in the same volume, the mass of the 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 1, some irregular gas micro-channels will be formed between the flexible heat insulation cotton and the inner wall surface of the frame 1. On the one hand, these gas micro-channels can play a role in isolating the flexible heat insulation cotton from the frame 1, and on the other hand, they can play a role in sound absorption and noise reduction.

[0090] The present utility model also proposes a gas water heater, such as Figure 8 and Figure 9, the gas water heater includes a burner 5, a heat exchanger 4, a blower 6 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 has at least 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.

[0091] It can be understood that the type of this gas water heater can be a forced-draft water heater. In this case, the blower 6 is arranged above the heat exchanger 4 to drive the air flow through negative pressure suction; or it can also be a blower-type water heater. In this case, the blower 6 is arranged below the burner 5 to drive the air flow by blowing air.

[0092] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A combustion chamber housing, characterized in that, Comprising: A housing, the inner cavity of which forms a combustion chamber; A heat insulation layer provided on the inner wall surface of the housing and surrounding the periphery of the combustion chamber; And At least two pressing plates spaced apart and distributed on the side of the heat insulation layer close to the combustion chamber; the pressing plates are fixedly clamped with the housing to limit the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that, The pressing plate includes: A pressing portion provided on the surface of the heat insulation layer close to the combustion chamber; and A clamping portion, one end of which is connected to the pressing portion and the other end passes through the heat insulation layer to be fixedly clamped with the housing.

3. The combustion chamber housing according to claim 2, characterized in that, The housing is provided with a card slot penetrating through its inner and outer wall surfaces, and a hook is provided at one end of the clamping portion facing away from the pressing portion; the clamping portion sequentially passes through the heat insulation layer and the card slot so that the hook is clamped and limited with the outer wall surface of the housing.

4. The combustion chamber housing according to claim 2, characterized in that, The pressing portion is provided with a hollow hole.

5. The combustion chamber housing according to any one of claims 1 to 4, characterized in that, The pressing plate is an integral metal part.

6. The combustion chamber housing according to any one of claims 1 to 4, characterized in that, At least two of the pressing plates are arranged at intervals along the circumferential direction of the housing; And / or, at least two of the pressing plates are distributed at the middle position in the height direction of the combustion chamber.

7. The combustion chamber housing according to any one of claims 1 to 4, characterized in that, The housing includes a bottom frame and a cover plate provided on the bottom frame, and the cover plate and the bottom frame enclose to form the combustion chamber with upper and lower openings; The heat insulation layer includes a first heat insulation layer and a second heat insulation layer, the first heat insulation layer is fixed to the inner wall surface of the bottom frame by at least two of the pressing plates, and the second heat insulation layer is fixed to the inner wall surface of the cover plate by at least two of the pressing plates.

8. The combustion chamber housing according to claim 7, wherein, The bottom frame includes a back plate and two side plates provided 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 number of the pressing plates corresponding to the back plate is at least two, and / or, the number of the pressing plates corresponding to the side plates is at least one.

9. The combustion chamber housing according to claim 8, wherein, The peripheral edge of the side plate is provided with a side plate flange bent towards the combustion chamber, and the inner side of the back plate is provided with a back plate flange bent towards the combustion chamber, and the side plate flange and the back plate flange cover the edge of the first heat insulation layer; The side plate flange and / or the back plate flange are provided with claws, and the claws are in limiting cooperation with the surface of the first heat insulation layer facing the combustion chamber.

10. The combustion chamber housing according to any one of claims 1 to 4, characterized in that, The heat insulation layer is a flexible heat insulation cotton.

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

12. A gas water heater, characterized in that, Comprising a burner, a heat exchanger, a blower and a combustion chamber housing according to any one of claims 1 to 11, the heat exchanger is provided above the combustion chamber housing, and the burner is provided below the combustion chamber housing; The blower is provided above the heat exchanger, or, the blower is provided below the burner.

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