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 bottom frame and flexible heat insulation cotton, the bottom frame comprises a back plate and two side plates arranged on the two opposite sides of the back plate, and the back plate and the two side plates define a cavity with an opening in one side; the flexible heat insulation cotton is arranged on the inner wall faces of the back plate and the two side plates. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the problem of water cut-off temperature rise can be effectively solved. In addition, the structure of the embodiment can also reduce the noise of the whole machine.

Description

Technical Field

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

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

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

[0004] In the related art, a hard insulation board is arranged on the inner wall of the combustion chamber shell to insulate and cool down. However, the heat storage capacity of the hard insulation board is relatively high, which easily leads to the problem of excessive temperature rise when water is cut off. Utility Model Content

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

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

[0007] A bottom frame, comprising a back plate and two side plates arranged on opposite sides of the back plate, wherein the back plate and the two side plates enclose a cavity with one side open; and

[0008] Flexible heat-insulating cotton is arranged on the inner wall surfaces of the back plate and the two side plates.

[0009] In one embodiment of the present application, the flexible thermal insulation cotton is an integrated structure.

[0010] In one embodiment of the present application, the flexible thermal insulation cotton is bent to form three sections of thermal insulation cotton to respectively cover the inner wall surfaces of the back panel and the two side panels.

[0011] In one embodiment of the present application, the bottom frame further includes a mounting plate extending upward from the top wall of the back plate, and the mounting plate is used to connect to the heat exchanger above the combustion chamber shell;

[0012] The sub-insulation cotton arranged on the back plate extends from the back plate to the mounting plate to separate the mounting plate from the heat exchanger.

[0013] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber.

[0014] In one embodiment of the present application, the density of the flexible thermal insulation cotton is less than 0.2g / cm3.

[0015] 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).

[0016] 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).

[0017] In one embodiment of the present application, the flexible thermal insulation cotton is a porous structure; the surface of the flexible thermal insulation cotton facing the inner wall surface of the bottom frame is concave and convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the inner wall surface of the bottom frame.

[0018] In one embodiment of the present application, the bottom frame is provided with a flange to cover the edge of the flexible thermal insulation cotton, and the flange is provided with a claw, and the claw is limitedly engaged with the surface of the flexible thermal insulation cotton away from the bottom frame.

[0019] In one embodiment of the present application, the flange includes a side panel flange formed by bending the peripheral edge of the side panel toward the cavity, and a back panel flange arranged on the inner side of the back panel, and at least one of the back panel flange and the side panel flange is provided with the clamping claw.

[0020] In one embodiment of the present application, the combustion chamber housing further comprises a limiting net arranged on the flexible heat-insulating cotton toward the cavity, and the limiting net is fixedly connected to the bottom frame to limit the flexible heat-insulating cotton;

[0021] And / or, the combustion chamber housing further comprises a pressing plate arranged on the flexible heat-insulating cotton toward the cavity, and the pressing plate is fixedly connected to the bottom frame to limit the flexible heat-insulating cotton.

[0022] In one embodiment of the present application, the combustion chamber housing further includes a plurality of screws, the back panel and / or the side panel are provided with mounting holes, and the screws sequentially pass through the flexible thermal insulation cotton and the mounting holes to be fixed to the back panel and / or the side panel.

[0023] In one embodiment of the present application, the combustion chamber housing further includes a cover plate, and the cover plate is arranged to cover the opening to enclose with the bottom frame to form a combustion chamber;

[0024] The inner wall surface of the cover plate is provided with flexible heat-insulating cotton.

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

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

[0027] In the combustion chamber shell of the technical solution of the utility model, by arranging flexible heat insulation cotton in the bottom frame, the flexible heat insulation cotton is arranged on the inner wall surfaces of the two side panels and the back panel, so that when the gas water heater is working normally, the flexible heat insulation cotton can block the heat in the combustion chamber from being transferred to the bottom frame; at the same time, the density of the flexible heat insulation cotton is lower than that of the hard insulation board, and the heat storage capacity is lower, so that the overall heat storage capacity of the combustion chamber shell is reduced. When the gas water heater stops discharging water, the combustion chamber shell with lower heat storage capacity will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the problem of temperature rise when the water is stopped. It can be seen that this embodiment can reduce the surface temperature of the combustion chamber shell, and at the same time can effectively improve the problem of temperature rise when the water is stopped. In addition, the structure of this embodiment can also reduce the noise of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0030] Figure 2 for Figure 1 An exploded schematic diagram of an embodiment;

[0031] Figure 3 This is a schematic diagram of the assembly structure of the bottom frame and the flexible heat-insulating cotton in the embodiment of the utility model;

[0032] Figure 4 for Figure 3 An exploded schematic diagram of an embodiment;

[0033] Figure 5 This is a schematic diagram of the structure of the bottom frame in the embodiment of the utility model;

[0034] Figure 6 This is a schematic diagram of the structure in which the flexible heat-insulating cotton is limited to the bottom frame by the pressing sheet in the embodiment of the utility model;

[0035] Figure 7 This is a schematic diagram of the structure of the flexible heat-insulating cotton in the embodiment of the utility model when it is not bent;

[0036] Figure 8 This is a schematic diagram of the matching structure of the cover plate and the flexible heat-insulating cotton in the embodiment of the utility model;

[0037] Fig. 9 This is a schematic diagram of the structure in which the flexible heat-insulating cotton is limited to the cover plate by the pressing sheet in the embodiment of the utility model;

[0038] Fig.10 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;

[0039] Fig.11 for Fig.10 An exploded schematic diagram of an embodiment;

[0040] Fig.12 It is a partial structural schematic diagram of the gas water heater of the utility model.

[0041] Description of Figure Numbers:

[0042] Label name Label name 1 Combustion chamber casing 121 Second mounting plate 11 Bottom frame 13 Flexible insulation cotton 111 Back Plate 131 First son insulation cotton 111a Back panel flange 132 Second son insulation cotton 112 Side panels 133 The third son of thermal insulation cotton 112a Side panel flanging 14 Tablet pressing 113 First mounting plate 2 Heat Exchanger 114 Claws 3 Burner 12 Cover 4 Fan

[0043] 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

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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. In the related art, a hard insulation board is set on the inner wall of the combustion chamber shell to insulate and cool down.

[0049] 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, making the user feel hot, which is the water stop temperature rise. However, in the related art, a hard insulation board is set on the inner wall of the combustion chamber shell to insulate and cool down. The hard insulation board is usually a heat insulation material pressed into a board body by gluing, which has a high density and a large heat storage capacity, thereby increasing the total heat storage of the combustion chamber shell. More heat will be transferred to the heat exchanger to heat the stagnant water, resulting in the problem of excessive water stop temperature rise.

[0050] Based on this, the utility model proposes a combustion chamber shell 1, which is applied to a gas water heater, and aims to reduce the surface temperature of the combustion chamber shell while solving the problem of temperature rise when water is shut off. Fig.12 The gas water heater includes a combustion chamber shell 1, a heat exchanger 2, a burner 3 and a fan 4. A combustion chamber that passes through from top to bottom is formed inside the combustion chamber shell 1. The heat exchanger 2 is arranged above the combustion chamber shell 1, and the burner 3 is located below the combustion chamber shell 1. The burner 3 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 2 to heat the heated device (such as a water pipe) in the heat exchanger 2. The fan 4 plays the role of driving the gas and air into the combustion chamber for combustion and transporting the high-temperature flue gas after combustion to the heat exchanger 2 for heat exchange, and then discharging the exhaust gas after heat exchange. The structure of the combustion chamber shell 1 is explained in the following by way of an embodiment.

[0051] As Figures 1 to 4 shown, the combustion chamber housing 1 includes a bottom frame 11 and a flexible heat insulation cotton 13. The bottom frame 11 includes a back plate 111 and two side plates 112 provided on opposite sides of the back plate 111. The back plate 111 and the two side plates 112 enclose a cavity with one side open; the flexible heat insulation cotton 13 is provided on the inner wall surfaces of the back plate 111 and the two side plates 112.

[0052] It can be understood that the two side plates 112 are respectively arranged on opposite sides of the back plate 111 to form a frame structure with an opening, wherein the back plate 111 is arranged opposite to the opening. At this time, the cross-section of the bottom frame 11 generally presents a "C" - shaped structure. By covering a cover plate 12 at the opening, the "C" - shaped structure is roughly changed into a structure with a cross-section in the shape of a "square", thereby forming a combustion chamber with upper and lower openings and a closed perimeter. To ensure the structural strength and high-temperature resistance of the bottom frame 11, the bottom frame 11 can be made of sheet metal parts. For the convenience of production and manufacturing, the bottom frame 11 can be integrally formed. For example, when producing the bottom frame 11, a sheet metal part can be directly used to integrally bend and form the "C" - shaped structure of the back plate 111 and the two side plates 112, so that the manufacturing process can be simplified and the production efficiency can be improved.

[0053] In this embodiment, by arranging the flexible heat insulation cotton 13 inside the bottom frame 11, and the flexible heat insulation cotton 13 is provided on the inner wall surfaces of the back plate 111 and the two side plates 112, it can play a role in isolating high-temperature flue gas from the bottom frame 11, preventing the heat in the combustion chamber from being transferred to the combustion chamber housing 1, and achieving the purpose of reducing the surface temperature of the combustion chamber housing 1. At the same time, the flexible heat insulation cotton 13 isolates the heat transfer to the bottom frame 11, reducing the overall heat storage capacity of the combustion chamber housing 1. Thus, when the user stops using water, the combustion chamber housing 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 2 to heat the non-flowing water. Therefore, the problem of the temperature rise during the stop of water supply can be effectively improved.

[0054] It should be noted that in this embodiment, the flexible heat insulation cotton 13 is arranged on the inner wall surface of the bottom frame 11. The flexible heat insulation cotton 13 has the characteristics of flexibility and heat insulation. Compared with the method of using a rigid heat insulation board for heat insulation in the related art, the density of the flexible heat insulation cotton 13 in this embodiment is lower. Then, under the same volume, the mass of the flexible heat insulation cotton 13 is lower, and thus the heat storage capacity will also be lower, which can reduce the overall heat storage capacity of the combustion chamber housing 1 and effectively improve the temperature rise during the stop of water supply. In addition, the flexible, cottony and fluffy characteristics of the flexible heat insulation cotton 13 can also play a role in buffering and sound absorption, achieving the effect of noise reduction, without the need to additionally set up a shock absorption structure.

[0055] The specific material of the flexible thermal insulation cotton 13 can also be determined according to the actual situation, for example, it can be glass fiber thermal insulation cotton, mineral wool thermal insulation cotton, polyester thermal insulation cotton, ceramic fiber thermal insulation cotton, silica thermal insulation cotton, silica thermal insulation cotton or thermal insulation cotton of other materials, etc., as long as it can play a role in fireproofing and heat insulation. In this embodiment, taking into account factors such as thermal insulation effect and cost, as an example, the flexible thermal insulation cotton 13 uses aluminum silicate fiber cotton with a lower density. The density of aluminum silicate wool is less than 0.2g / cm3, which is much smaller than conventional hard thermal insulation materials such as the density of aluminum silicate board 0.36g / cm3, and is also much smaller than the density of stainless steel used in air cooling mode 7.93g / cm3. Therefore, under the same volume, this embodiment can greatly reduce the heat storage and effectively reduce the water outage temperature rise. Preferably, the density of the flexible thermal insulation cotton 13 is 0.128g / cm3 to achieve a better effect of reducing the heat storage.

[0056] In one embodiment, the specific heat capacity C of the flexible thermal insulation cotton 13 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 increase the temperature of 1 gram of the flexible thermal insulation cotton 13 by 1°C is between 0.3 joules and 1.5 joules, thereby ensuring a good thermal insulation effect while reducing thermal conductivity.

[0057] In order to further improve the heat insulation effect, preferably, the specific heat capacity C of the flexible heat insulation cotton 13 is between 1.0 J / (gK) and 1.3 J / (gK). Furthermore, preferably, the specific heat capacity C of the flexible heat insulation cotton 13 is between 1.0 J / (gK) and 1.1 J / (gK).

[0058] In actual application, the flexible heat insulating cotton 13 may completely cover the inner wall surfaces of the two side panels 112 and the back panel 111, or may partially cover the inner wall surfaces of the two side panels 112 and the back panel 111. In order to achieve a better heat insulation effect, in this embodiment, the flexible heat insulating cotton 13 is used to fully cover the inner wall surfaces of the two side panels 112 and the back panel 111.

[0059] In summary, in the combustion chamber housing 1 of the technical solution of the present utility model, by arranging a flexible heat insulation cotton 13 inside the bottom frame 11, and the flexible heat insulation cotton 13 is arranged on the inner wall surfaces of the two side plates 112 and the back plate 111, when the gas water heater is discharging water normally, the flexible heat insulation cotton 13 can block the heat transfer in the combustion chamber to the bottom frame 11; at the same time, the flexible heat insulation cotton 13 has a lower density and lower heat storage capacity compared with the hard heat insulation board, so that the overall heat storage capacity of the combustion chamber housing 1 is reduced. When the gas water heater stops discharging water, the combustion chamber housing 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 2 to heat the non-flowing water, and can effectively improve the problem of the temperature rise during shutdown. It can be seen that this embodiment can reduce the surface temperature of the combustion chamber housing 1 and can effectively improve the problem of the temperature rise during shutdown. In addition, the structure of this embodiment can also reduce the noise of the whole machine.

[0060] In one embodiment of the present application, as Figures 3 to 7 , the flexible heat insulation cotton 13 is of an integral structure.

[0061] It can be understood that the bottom frame 11 includes a back plate 111 and two side plates 112, and 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 in different planes. By setting the flexible heat insulation cotton 13 as an integral structure, due to its flexible characteristics, the flexible heat insulation cotton 13 can be bent according to the shapes of the back plate 111 and the two side plates 112, so that the shape of the flexible heat insulation cotton 13 is adapted to the shape of the inner wall surface of the bottom frame 11, so that the flexible heat insulation cotton 13 can better cover the inner wall surface of the bottom frame 11 and achieve a better heat insulation effect.

[0062] Specifically, the flexible heat insulation cotton 13 is bent to form three sub heat insulation cottons (131 / 132 / 133) to respectively cover the inner wall surfaces of the back plate 111 and the two side plates 112. It can be understood that the bottom frame 11 forms a structure roughly in the shape of a "匚" by the back plate 111 and the two side plates 112. By bending the flexible heat insulation cotton 13 into three sections, the first sub heat insulation cotton 131 covers the inner wall surface of one side plate 112, the second sub heat insulation cotton 132 covers the inner wall surface of the back plate 111, and the third sub heat insulation cotton 133 covers the inner wall surface of the other side plate 112. Optionally, the flexible heat insulation cotton 13 can adopt a U-shaped integral heat insulation cotton to adapt to the bottom frame 11 with a "匚" shape structure.

[0063] In this embodiment, an integrated flexible heat-insulating cotton 13 is used, which is bent to match the inner wall surfaces of different plates, so that the connection between two adjacent plates is also covered by the flexible heat-insulating cotton 13. Compared with the method in the related art that different plates need to be provided with separate hard heat-insulating boards for heat insulation, since there is a gap at the connection between the hard heat-insulating boards in the related art, the heat-insulating capacity of the edges is poor. This embodiment can avoid the gap at the connection between the plates and further improve the heat-insulating capacity.

[0064] In one embodiment of the present application, the flexible thermal insulation cotton 13 is a porous structure; the surface of the flexible thermal insulation cotton 13 in contact with the inner wall surface of the combustion chamber shell 1 is concave and convex, so that there are multiple irregular gas microchannels (not shown) between the flexible thermal insulation cotton 13 and the inner wall surface of the combustion chamber shell 1.

[0065] It is understandable that the density of the flexible thermal insulation cotton 13 is lower than that of the cardboard structure, so at the same volume, the mass of the flexible thermal insulation cotton 13 is lower, and the heat storage capacity is also lower. The internal structure of the flexible thermal insulation cotton 13 is relatively fluffy and porous, and the surface of the flexible thermal insulation cotton 13 is uneven. When the flexible thermal insulation cotton 13 is installed on the inner wall of the combustion chamber shell 1, some irregular gas microchannels will be formed between the flexible thermal insulation cotton 13 and the inner wall of the combustion chamber shell 1. On the one hand, the gas microchannel can better take away the heat inside the flexible thermal insulation cotton 3 to achieve a better thermal insulation effect, and on the other hand, it can play a role in sound absorption and noise reduction.

[0066] In one embodiment of the present application, Figure 3 , Fig.10 as well as Fig.11 The bottom frame 11 further 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 2 above the combustion chamber housing 1;

[0067] The second sub-insulation cotton 132 extends from the back plate 111 to the first mounting plate 113 to separate the first mounting plate 113 from the heat exchanger 2 .

[0068] It can be understood that the heat exchanger 2 is mounted on the first mounting plate 113, which is located above the combustion chamber. In this embodiment, by extending the second sub-insulation cotton 132 to the first mounting plate 113 to separate the first mounting plate 113 and the heat exchanger 2, the heat transfer between the first mounting plate 113 and the heat exchanger 2 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 2 to cause the water supply to stop and the temperature rise.

[0069] In addition, it should be noted that when the user turns off the water midway, the fan 4 has a post-cleaning action (after the burner stops burning, the fan 4 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 flexible insulation cotton 13 and the fins of the heat exchanger 2, 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 2. In this embodiment, by extending the second sub-insulation cotton 132 upward to the heat exchanger 2, the first mounting plate 113 is isolated from the heat exchanger 2, which can effectively prevent the higher temperature bottom frame 11 from transferring its own heat to the heat exchanger 2 after the water is turned off.

[0070] Optionally, the second sub-insulation cotton 132 may partially cover the first mounting plate 113 , or may also completely cover the first mounting plate 113 .

[0071] In one embodiment of the present application, Figures 3 to 5 The bottom frame 11 is provided with a flange (111a / 112a) to cover the edge of the flexible heat-insulating cotton 13, and the flange (111a / 112a) is provided with a claw 114, which is limitedly matched with the surface of the flexible heat-insulating cotton 13 away from the bottom frame 11.

[0072] This embodiment illustrates the installation structure of the flexible heat-insulating cotton 13 and the bottom frame 11. By setting a flange (111a / 112a) on the bottom frame 11 to support the edge of the flexible heat-insulating cotton 13, and then clamping the flexible heat-insulating cotton 13 through the claws 114 on the flange (111a / 112a), the installation and fixation of the flexible heat-insulating cotton 13 is achieved. As for the flexible heat-insulating cotton 13 at the first mounting plate 113, it can be clamped and fixed when the heat exchanger 2 is assembled with the first mounting plate 113, or it can also be strengthened and fixed by screwing.

[0073] Specifically, the flange includes a side panel flange 112a formed by bending the peripheral edge of the side panel 112 toward the cavity, and a back panel flange 111a arranged on the inner side of the back panel 111, and at least one of the back panel flange 111a and the side panel flange 112a is provided with a claw 114.

[0074] In this embodiment, the peripheral edge of the side plate 112 includes an upper edge, a front edge and a lower edge, and a side plate 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 sub-insulation cotton 131 and the third sub-insulation cotton 133, so that the installation of the sub-insulation cotton of the corresponding side plate 112 is more reliable. Since the second sub-insulation cotton 132 extends upward to the first mounting plate 113, a back plate flange 111a can be provided on the inner side of the back plate 111 to support the lower edge of the second sub-insulation cotton 132. Then, a claw 114 can be provided on at least one of the back plate flange 111a and the side plate flange 112a to limit the corresponding sub-insulation cotton. It is understandable that the claw 114 may be provided on only the back panel flange 111a, or on only the side panel flange 112a, or on both the back panel flange 111a and the side panel flange 112a.

[0075] As an example, claws 114 are provided on both the back panel flange 111a and the side panel flange 112a to increase the limiting area of ​​the flexible thermal insulation cotton 13 and increase the limiting area, which can further improve the installation reliability of the flexible thermal insulation cotton 13.

[0076] In actual application, in order to further improve the installation reliability of the flexible thermal insulation cotton 13, in some embodiments, the fixation can be strengthened by screwing screws, for example, mounting holes are set on the back panel 111 and / or the side panel 112, and the screws pass through the flexible thermal insulation cotton 13 and the mounting holes in turn and are fixed to the back panel 111 and / or the side panel 112.

[0077] Optionally, the corresponding sub-insulation cotton may be fixed by screws on both the back panel 111 and the side panel 112; or, the corresponding sub-insulation cotton may be fixed by screws only on the two side panels 112; or, the corresponding sub-insulation cotton may be fixed by screws only on the back panel 111.

[0078] In actual application, in order to improve the reliability of the flexible thermal insulation cotton 13, gaskets can also be set at the screw locations, and the gaskets can be used to increase the limiting area of ​​the flexible thermal insulation cotton 13. This can increase the structural reliability of the flexible thermal insulation cotton 13 and prevent it from breaking when impacted during a drop test or transportation.

[0079] In an embodiment of the present application, the combustion chamber housing 1 further includes a limiting net disposed on the side of the flexible heat insulation cotton 13 facing the cavity, and the limiting net is fixedly connected to the bottom frame 11 to limit the flexible heat insulation cotton 13. It can be understood that since the flexible heat insulation cotton 13 is a flexible cotton structure, it may be fragmented when it is impacted during a drop test or transportation. In this embodiment, by setting the limiting net to limit the flexible heat insulation cotton 13, the structural reliability of the flexible heat insulation cotton 13 can be ensured, and it can be prevented from being fragmented when impacted during a drop test or transportation. Optionally, the limiting net can be fixedly connected to the bottom frame 11 by welding, screwing, riveting, etc. Optionally, the limiting net is a metal net.

[0080] In an embodiment of the present application, as Figure 6 , the combustion chamber housing 1 further includes a pressing piece 14 disposed on the side of the flexible heat insulation cotton 13 facing the cavity, and the pressing piece 14 is fixedly connected to the bottom frame 11 to limit the flexible heat insulation cotton 13. It can be understood that since the flexible heat insulation cotton 3 is a flexible cotton structure, it may be fragmented when it is impacted during a drop test or transportation. In this embodiment, by setting the pressing piece 14 to limit the flexible heat insulation cotton 13, the structural reliability of the flexible heat insulation cotton 13 is ensured, and it can be prevented from being fragmented when impacted during a drop test or transportation. Optionally, the pressing piece 14 is a strip-shaped pressing piece or a circular gasket, and can be fixedly connected to the bottom frame 11 by welding, screwing, riveting, etc. Optionally, the pressing piece 14 is a metal sheet.

[0081] In an embodiment of the present application, as Figure 1 , Figure 2 , Figures 8 to 11 , the combustion chamber housing 1 further includes a cover plate 12, and the cover plate 12 covers the open end to form a combustion chamber in cooperation with the bottom frame 11; the inner wall surface of the cover plate 12 is provided with the flexible heat insulation cotton 13.

[0082] It can be understood that the bottom frame 11 forms a structure with a cross-sectional shape approximately "C" - shaped. By covering the cover plate 12 at the open end, the "C" - shaped structure is approximately changed into an "O" - shaped structure, thus forming a combustion chamber with upper and lower openings and closed around. The two sides of the cover plate 12 are respectively fixedly connected to the two side plates 112. By providing the flexible heat insulation cotton 13 on the inner wall surface of the cover plate 12, the heat in the combustion chamber can be prevented from being transferred to the cover plate 12, reducing the heat storage capacity of the cover plate 12, and further avoiding the heat being transferred from the cover plate 12 to the heat exchanger 2.

[0083] Specifically, 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 2 is installed between the first mounting plate 113 and the second mounting plate 121. The flexible heat insulation cotton 13 installed on the cover plate 12 extends to the second mounting plate 121 to separate the second mounting plate 121 and the heat exchanger 2 to prevent heat transfer between the two. In actual installation, the flexible heat insulation cotton 13 is first installed on the inner wall of the bottom frame 11, and then the heat exchanger 2 is installed on the first mounting plate 113, so that the heat exchanger 2 and the first mounting plate 113 clamp the first heat insulation cotton 31 therebetween. At the same time, the flexible heat insulation cotton 13 is installed on the inner wall of the cover plate 12, and then the cover plate 12 with the flexible heat insulation cotton 13 is covered on the bottom frame 11, so that the second mounting plate 121 and the heat exchanger 2 clamp the flexible heat insulation cotton 13 therebetween.

[0084] In actual application, the installation method of the flexible insulation cotton 13 and the cover plate 12 can be determined according to the actual situation. For example, the flexible insulation cotton 13 can be installed and fixed by setting flanges and claws on the cover plate 12; or, it can be fixed by screwing.

[0085] In one embodiment, a limiting net can be provided on the side of the flexible thermal insulation cotton 13 facing away from the cover plate 12, and the limiting net is fixedly connected to the cover plate 12 to limit the flexible thermal insulation cotton 13. It can be understood that since the flexible thermal insulation cotton 13 is a flexible cotton structure, it may break when it is hit during a drop test or transportation and handling. In this embodiment, the limiting net is provided to limit the flexible thermal insulation cotton 13, so that the structural reliability of the flexible thermal insulation cotton 13 can be ensured to prevent it from breaking when it is hit during a drop test or transportation and handling. Optionally, the limiting net can be fixed to the cover plate 12 by welding, screwing, or riveting. Optionally, the limiting net is a metal net.

[0086] In one embodiment, if Fig. 9 , a pressing sheet 14 can be provided on the side of the flexible thermal insulation cotton 13 facing away from the cover plate 12, and the pressing sheet 14 is fixedly connected to the cover plate 12 to limit the flexible thermal insulation cotton 13. It can be understood that since the flexible thermal insulation cotton 3 is a flexible cotton structure, it may be broken when it is hit during a drop test or transportation and handling. In this embodiment, the pressing sheet 14 is provided to limit the flexible thermal insulation cotton 13 to ensure the structural reliability of the flexible thermal insulation cotton 13 and prevent it from being broken when it is hit during a drop test or transportation and handling. Optionally, the pressing sheet 14 is a strip pressing sheet or a circular gasket, which can be fixed to the cover plate 12 by welding, screwing, or riveting. Optionally, the pressing sheet 14 is a metal sheet.

[0087] The utility model also provides a gas water heater, such as Figures 10 to 12The gas water heater comprises a burner 3, a heat exchanger 2, a fan 4 and a combustion chamber shell 1. The specific structure of the combustion chamber shell 1 refers to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the heat exchanger 2 is arranged above the combustion chamber shell 1, and the burner 3 is arranged below the combustion chamber shell 1.

[0088] It can be understood that the type of the gas water heater can be a forced-draft water heater, in which case the fan 5 is arranged above the heat exchanger 2 to drive the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 5 is arranged below the burner 4 to drive the airflow by blowing air.

[0089] 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: The bottom frame comprises a back plate and two side plates arranged on opposite sides of the back plate, wherein the back plate and the two side plates are combined to form a cavity with one side open; and Flexible heat-insulating cotton is arranged on the inner wall surfaces of the back plate and the two side plates.

2. The combustion chamber housing according to claim 1, characterized in that The flexible heat-insulating cotton is an integrated structure.

3. The combustion chamber housing according to claim 2, characterized in that The flexible heat-insulating cotton is bent to form three sections of heat-insulating cotton to respectively cover the inner wall surfaces of the back plate and the two side plates.

4. The combustion chamber housing according to claim 3, characterized in that The bottom frame further includes a mounting plate extending upward from the top wall of the back plate, wherein the mounting plate is used to connect to the heat exchanger above the combustion chamber shell; The sub-insulation cotton arranged on the back plate extends from the back plate to the mounting plate to separate the mounting plate from the heat exchanger.

5. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber.

6. The combustion chamber housing according to claim 5, characterized in that The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

7. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

8. The combustion chamber housing according to claim 7, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0 J / (gK)≤C≤1.3 J / (gK).

9. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The flexible thermal insulation cotton is a porous structure; the surface of the flexible thermal insulation cotton facing the inner wall surface of the bottom 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 bottom frame.

10. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The bottom frame is provided with a flange to cover the edge of the flexible heat-insulating cotton, and the flange is provided with a claw, and the claw is limitedly matched with the surface of the flexible heat-insulating cotton away from the bottom frame.

11. The combustion chamber housing according to claim 10, characterized in that The flange includes a side panel flange formed by bending the peripheral edge of the side panel toward the cavity, and a back panel flange arranged on the inner side of the back panel, and at least one of the back panel flange and the side panel flange is provided with the clamping claw.

12. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The combustion chamber housing further comprises a limiting net arranged on the flexible heat-insulating cotton toward the cavity, and the limiting net is fixedly connected to the bottom frame to limit the flexible heat-insulating cotton; And / or, the combustion chamber housing further comprises a pressing plate arranged on the flexible heat-insulating cotton toward the cavity, and the pressing plate is fixedly connected to the bottom frame to limit the flexible heat-insulating cotton.

13. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The combustion chamber housing further comprises a plurality of screws, the back plate and / or the side plate are provided with mounting holes, and the screws sequentially pass through the flexible heat-insulating cotton and the mounting holes and are fixed to the back plate and / or the side plate.

14. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The combustion chamber housing further comprises a cover plate, which is arranged on the opening to enclose the combustion chamber with the bottom frame; The inner wall surface of the cover plate is provided with flexible heat-insulating cotton.

15. 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 14, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell; The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

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