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. The gas water heater comprises a frame body and flexible heat insulation cotton; an inner cavity of the frame body forms a combustion chamber; the flexible heat insulation cotton is arranged on the inner wall face of the frame body, makes contact with the inner wall face of the frame body and at least surrounds the combustion chamber, and the surface, making contact with the frame body, of the flexible heat insulation cotton is in a concave-convex shape, so that a gas micro-channel is formed between the flexible heat insulation cotton and the frame body. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, and meanwhile the heat insulation material and the frame body can be fixed more tightly. In addition, the structure of the embodiment can effectively solve the problem of temperature rise caused by water cut-off and 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 heat insulating material (hard heat insulating board) is arranged on the inner wall of the frame on the combustion chamber shell to insulate and cool down. Since the hard heat insulating board has a high heat storage capacity and insufficient heat insulating capacity, an air barrier is usually formed between the hard heat insulating board and the inner wall of the frame to reduce the surface temperature of the combustion chamber shell. However, the hard heat insulating board arranged at intervals is not fixed tightly to the frame. Utility Model Content

[0005] The main purpose of the utility model is to provide a combustion chamber shell and a gas water heater, aiming to reduce the surface temperature of the combustion chamber shell and to make the fixation between the heat insulating material and the frame tighter.

[0006] It can solve the problem of temperature rise due to water outage.

[0007] In order to achieve the above-mentioned purpose, the gas water heater proposed by the utility model comprises:

[0008] a frame, the inner cavity of which forms a combustion chamber;

[0009] Flexible thermal insulation cotton is arranged on the inner wall surface of the frame and contacts the inner wall surface of the frame, and is at least arranged around the combustion chamber. The surface where the flexible thermal insulation cotton contacts the frame is concave and convex, so that a gas microchannel is formed between the flexible thermal insulation cotton and the frame.

[0010] In one embodiment of the present application, the gas microchannel includes a plurality of irregular microchannels.

[0011] In one embodiment of the present application, a plurality of irregular microchannels are interconnected.

[0012] In one embodiment of the present application, the flexible thermal insulation cotton is a porous structure.

[0013] 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).

[0014] 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).

[0015] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber;

[0016] The density of the flexible thermal insulation cotton is less than 0.2g / cm 3 .

[0017] In one embodiment of the present application, the frame is provided with a plurality of gas ports connecting the gas microchannels with the outside.

[0018] In one embodiment of the present application, the frame has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the two mounting plates are used to connect to the heat exchanger above the frame;

[0019] The flexible heat insulating cotton is used to cover the heat exchanger to separate the heat exchanger from the corresponding mounting plate.

[0020] In one embodiment of the present application, the frame includes:

[0021] A bottom frame having an opening; a back plate of the bottom frame opposite to the opening extending upward to form the mounting plate; and

[0022] A cover plate, which covers the opening of the bottom frame and is enclosed with the bottom frame to form the combustion chamber; the cover plate extends upward to form another mounting plate;

[0023] The flexible thermal insulation cotton includes a first thermal insulation cotton and a second thermal insulation cotton. The first thermal insulation cotton covers the bottom frame and the corresponding inner wall surface of the mounting plate, and the second thermal insulation cotton covers the cover plate and the corresponding inner wall surface of the mounting plate.

[0024] In one embodiment of the present application, the bottom frame further includes two side panels disposed on opposite sides of the back panel, the back panel and the two side panels enclose a cavity with an open opening, and the cover panel is connected to the two side panels;

[0025] The first heat insulating cotton is arranged on the inner wall surfaces of the back plate and the two side plates.

[0026] In one embodiment of the present application, the first thermal insulation cotton is fixedly connected to the bottom frame via a first fixing structure, and the portion of the first thermal insulation cotton corresponding to the heat exchanger is clamped and fixed by the heat exchanger and the corresponding mounting plate.

[0027] In one embodiment of the present application, the first fixing structure includes a flange provided on the bottom frame to cover the edge of the first thermal insulation cotton, the flange is provided with a claw, and the claw is limitedly engaged with a surface of the first thermal insulation cotton away from the bottom frame;

[0028] And / or, the first fixing structure includes a plurality of screws, and the first heat insulation cotton is installed on the bottom frame through the screws;

[0029] And / or, the first fixing structure includes a limiting net provided on the side of the first heat-insulating cotton facing the combustion chamber, and the limiting net is fixedly connected to the bottom frame to limit the first heat-insulating cotton;

[0030] And / or, the first fixing structure includes a pressing plate arranged on the side of the first thermal insulation cotton facing the combustion chamber, and the pressing plate is fixedly connected to the bottom frame to limit the first thermal insulation cotton.

[0031] In one embodiment of the present application, the second thermal insulation cotton is fixed to the cover plate through a second fixing structure, and the portion of the second thermal insulation cotton corresponding to the heat exchanger is clamped and fixed by the heat exchanger and the corresponding mounting plate.

[0032] In one embodiment of the present application, the second fixing structure includes a plurality of screws, and the second thermal insulation cotton is installed on the cover plate through the screws;

[0033] And / or, the second fixing structure includes a limiting net provided on the side of the second heat insulation cotton facing the combustion chamber, and the limiting net is fixedly connected to the cover plate to limit the second heat insulation cotton;

[0034] And / or, the second fixing structure includes a pressing plate arranged on the side of the second thermal insulation cotton facing the combustion chamber, and the pressing plate is fixedly connected to the cover plate to limit the second thermal insulation cotton.

[0035] In one embodiment of the present application, the first thermal insulation cotton is an integrated structure; and / or the second thermal insulation cotton is an integrated structure.

[0036] 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 housing, wherein the heat exchanger is arranged above the combustion chamber, and the burner is arranged below the combustion chamber;

[0037] The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

[0038] In the combustion chamber shell of the utility model technical solution, flexible thermal insulation cotton is arranged on the inner wall surface of the frame body, and the flexible thermal insulation cotton is at least arranged around the combustion chamber, so that when the gas water heater is working normally to discharge water, the flexible thermal insulation cotton can block the heat in the combustion chamber from being transferred to the frame body of the combustion chamber shell, so as to reduce the surface temperature of the combustion chamber shell; at the same time, the flexible thermal insulation cotton contacts with the inner wall surface of the frame body, so that the fixation between the flexible thermal insulation cotton and the frame body can be tighter and safer; and the surface of the flexible thermal insulation cotton in contact with the inner wall surface of the frame body is relatively fluffy and concave-convex, so when the flexible thermal insulation cotton is installed on the inner wall surface of the frame body, the flexible thermal insulation cotton and the frame body are closely connected. Some gas microchannels will be formed between the inner wall surfaces of the body. On the one hand, the gas microchannels can utilize the effect of the fan to form convection in the gas microchannels, and take away the heat emitted through the flexible insulation cotton, which can further reduce the surface temperature of the combustion chamber shell. On the other hand, it can play a role in sound absorption and noise reduction. In addition, compared with the hard insulation board, the flexible insulation cotton has a lower density and lower heat storage capacity, thereby reducing the overall heat storage capacity of the combustion chamber shell. 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 water is stopped.

[0039] It can be seen that this embodiment can reduce the surface temperature of the combustion chamber shell, and at the same time can make the insulation material (flexible insulation cotton) and the frame body more tightly fixed. In addition, the structure of this embodiment can also effectively improve the problem of water temperature rise and reduce the noise of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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.

[0041] Figure 1 This is a schematic structural diagram of an embodiment of a combustion chamber casing of the utility model;

[0042] Figure 2 A cross-sectional view of an embodiment of a combustion chamber casing of the utility model;

[0043] Figure 3 This is an explosion diagram of an embodiment of a combustion chamber casing of the utility model;

[0044] Figure 4 It is a schematic diagram of the assembly of the bottom frame and the first heat insulation cotton in one embodiment of the combustion chamber housing of the utility model;

[0045] Figure 5 for Figure 4 An exploded schematic diagram of an embodiment;

[0046] Figure 6 for Figure 4 A schematic diagram of the structure of the bottom frame in the embodiment;

[0047] Figure 7 It is a schematic diagram of the assembly of the cover plate and the second heat insulation cotton in one embodiment of the combustion chamber housing of the utility model;

[0048] Figure 8 for Figure 7 The outer structure diagram of the embodiment;

[0049] Fig. 9 for Figure 7 An exploded schematic diagram of an embodiment;

[0050] Fig.10 It is a schematic diagram of the assembly of the bottom frame and the first heat insulation cotton in another embodiment of the combustion chamber housing of the utility model;

[0051] Fig.11 for Fig.10 An exploded schematic diagram of an embodiment;

[0052] Fig.12 It is a schematic diagram of the assembly of the cover plate and the second heat insulation cotton in another embodiment of the combustion chamber housing of the utility model;

[0053] Fig.13 for Fig.12 The outer structure diagram of the embodiment;

[0054] Fig.14 for Fig.12 An exploded schematic diagram of an embodiment;

[0055] Fig.15 It is a schematic diagram of the assembly of the bottom frame and the first heat insulation cotton in another embodiment of the combustion chamber shell of the utility model;

[0056] Fig.16 for Fig.15 An exploded view of an embodiment;

[0057] Fig.17 This is a schematic diagram of the assembly of the cover plate and the second heat insulation cotton in another embodiment of the combustion chamber housing of the utility model;

[0058] Fig.18 It is a schematic diagram of the assembly of the combustion chamber shell and the heat exchanger in the embodiment of the utility model;

[0059] Fig.19 for Fig.18 An exploded view of an embodiment;

[0060] Fig. 20It is a partial structural schematic diagram of the gas water heater of the utility model;

[0061] Fig.21 It is a schematic diagram of the structural coordination of the combustion chamber, the heat exchanger and the flexible thermal insulation cotton in the embodiment of the utility model.

[0062] Description of Figure Numbers:

[0063]

[0064]

[0065] 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

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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. 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. In the related art, a hard insulation board is set on the inner wall of the frame on the combustion chamber shell to insulate and cool down. Since the hard insulation board has a high heat storage capacity and insufficient insulation capacity, the hard insulation board is usually spaced from the inner wall of the frame to form an air barrier to reduce the surface temperature of the combustion chamber shell. However, the hard insulation board and the frame are not fixed tightly.

[0071] 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.

[0072] Based on this, the utility model proposes a combustion chamber shell, which is applied to a gas water heater, and is intended to reduce the surface temperature of the combustion chamber shell, and at the same time, to make the insulation material and the frame 1 more tightly fixed. It can be understood that, if Figures 18 to 21 The gas water heater includes a combustion chamber shell, a heat exchanger 5, a burner 6 and a fan 7. A combustion chamber A is formed inside the combustion chamber shell, which is connected from top to bottom. The heat exchanger 5 is arranged above the combustion chamber A, and the burner 6 is located below the combustion chamber A. The burner 6 plays the role of ignition and combustion. The combustion chamber A provides a combustion space for the combustion of gas and air. The high-temperature flue gas generated after the gas and air are mixed and burned flows upward to the heat exchanger 5 to heat the heated device (such as a water pipe) in the heat exchanger 5. The fan 7 drives the gas and air into the combustion chamber A for combustion and transports the high-temperature flue gas after combustion to the heat exchanger 5 for heat exchange, and then discharges the exhaust gas after heat exchange. The structure of the combustion chamber shell is explained in the following by way of an embodiment.

[0073] like Figures 1 to 9As shown, the combustion chamber shell includes a frame 1 and flexible thermal insulation cotton 3. The inner cavity of the frame 1 forms a combustion chamber A. The flexible thermal insulation cotton 3 is arranged on the inner wall surface of the frame 1 and contacts the inner wall surface of the frame 1, and is at least arranged around the combustion chamber A. The flexible thermal insulation cotton 3 is a porous structure, and the surface where the flexible thermal insulation cotton 3 contacts the frame 1 is concave and convex, so that a gas microchannel C is formed between the flexible thermal insulation cotton 3 and the frame 1.

[0074] It can be understood that the inner cavity of the frame 1 can form a combustion chamber A which is open at the top and bottom and closed on all sides. In order to ensure the structural strength and high temperature resistance of the frame 1, the frame 1 can be made of sheet metal. In actual application, the frame 1 can be an integrally formed structure, or a split structure divided into two, three or other multiple structural parts. Correspondingly, the flexible thermal insulation cotton 3 can be an integrally formed structure, or a split structure divided into two, three or other multiple structural parts, so as to facilitate the installation between the flexible thermal insulation cotton 3 and the frame 1.

[0075] In this embodiment, by arranging the flexible heat-insulating cotton 3 in the bottom frame 11, the flexible heat-insulating cotton 3 is arranged on the inner wall surface of the frame 1 and contacts the inner wall surface of the frame 1, which can isolate the high-temperature flue gas from the frame 1, prevent the heat in the combustion chamber A from being transferred to the frame 1, and achieve the purpose of reducing the surface temperature of the combustion chamber shell. At the same time, the flexible heat-insulating cotton 3 isolates the heat from being transferred to the frame 1, and reduces the overall heat storage of the combustion chamber shell. Therefore, when the user stops using water, the combustion chamber shell with a lower heat storage will not transfer too much heat to the heat exchanger 5 to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water is stopped.

[0076] It should be noted that the surface where the flexible thermal insulation cotton 3 contacts the frame 1 is concave-convex, which refers to the concave-convex shape formed by the fluffy characteristics of the flexible thermal insulation cotton 3 itself. Therefore, there is no need to set an additional concave-convex structure on the surface of the flexible thermal insulation cotton 3 facing the inner wall of the frame 1, nor is there any need to set an additional concave-convex structure on the inner wall of the frame 1. This can not only form a gas microchannel C between the flexible thermal insulation cotton 3 and the frame 1, but also simplify the preparation process and reduce costs.

[0077] In this embodiment, the inner wall surface of the frame 1 is provided with a flexible heat-insulating cotton 3, which has the characteristics of flexibility and heat insulation. Compared with the method of using a hard heat-insulating board as a heat-insulating material for heat insulation in the related art, the density of the flexible heat-insulating cotton 3 in this embodiment is lower, so under the same volume, the mass of the flexible heat-insulating cotton 3 in this embodiment is lower, and the heat storage capacity is also lower, which can reduce the heat storage capacity of the combustion chamber shell as a whole, and effectively improve the problem of water-stop temperature rise. In addition, the flexible heat-insulating cotton 3 has the characteristics of flexibility, cotton and other fluffy properties, and can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need for additional shock-absorbing structures.

[0078] In practical applications, the specific structural shape of the flexible heat-insulating cotton 3 can be determined according to the actual situation, for example, it can be adapted to the shape of the inner wall surface of the frame 1, or it can be adapted only to the shape around the combustion chamber A, or it can be other shapes, etc. In this embodiment, for better heat insulation effect, the flexible heat-insulating cotton 3 is at least arranged around the combustion chamber A. It can be understood that the flexible heat-insulating cotton 3 is only arranged around the combustion chamber A, or the flexible heat-insulating cotton 3 can be arranged in other parts besides the combustion chamber A, such as the heat exchanger 5, the flue, etc.

[0079] The specific material of the flexible thermal insulation wool 3 can also be determined according to actual conditions. For example, it can be glass fiber thermal insulation wool, mineral wool thermal insulation wool, polyester thermal insulation wool, ceramic fiber thermal insulation wool, silicate thermal insulation wool, silica thermal insulation wool or thermal insulation wool of other materials, as long as it can play a role in fire prevention and heat insulation.

[0080] In summary, in the combustion chamber shell of the technical solution of the utility model, a flexible thermal insulation cotton 3 is arranged on the inner wall surface of the frame 1, and the flexible thermal insulation cotton 3 is at least arranged around the combustion chamber A, so that when the gas water heater is working normally, the flexible thermal insulation cotton 3 can block the heat in the combustion chamber A from being transferred to the frame 1 of the combustion chamber shell, so as to reduce the surface temperature of the combustion chamber shell; at the same time, the flexible thermal insulation cotton 3 contacts the inner wall surface of the frame 1, so that the fixation between the flexible thermal insulation cotton 3 and the frame 1 can be tighter and safer; and the surface of the flexible thermal insulation cotton 3 in contact with the inner wall surface of the frame 1 is relatively fluffy and concave-convex, so when the flexible thermal insulation cotton 3 is installed on the inner wall surface of the frame 1, the flexible Some gas microchannels C will be formed between the insulation cotton 3 and the inner wall surface of the frame 1. On the one hand, the gas microchannel C can utilize the effect of the fan 7 to form convection in the gas microchannel C, and take away the heat emitted through the flexible insulation cotton 3, which can further reduce the surface temperature of the combustion chamber shell. On the other hand, it can play a role in sound absorption and noise reduction; in addition, the flexible insulation cotton 3 has a lower density and lower heat storage capacity than the hard insulation board, thereby reducing the overall heat storage capacity of the combustion chamber shell. 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 5 to heat the stagnant water, which can effectively improve the problem of temperature rise when water is stopped.

[0081] It can be seen that this embodiment can reduce the surface temperature of the combustion chamber shell, and at the same time can make the insulation material (flexible insulation cotton 3) and the frame 1 more tightly fixed. In addition, the structure of this embodiment can also effectively improve the problem of water temperature rise and reduce the noise of the whole machine.

[0082] In one embodiment of the present application, Figure 2 , the gas microchannel C includes a plurality of irregular microchannels.

[0083] In this embodiment, since the surface of the flexible thermal insulation cotton 3 is concavoconvex due to the fluffy characteristics of the flexible thermal insulation cotton 3 itself, the corresponding fluffiness of the flexible thermal insulation cotton 3 at various positions is irregular, so when the flexible thermal insulation cotton 3 is installed on the inner wall surface of the frame 1, multiple irregular microchannels will be formed between the flexible thermal insulation cotton 3 and the inner wall surface of the frame 1, so that multiple irregular microchannels can be formed between the flexible thermal insulation cotton 3 and the inner wall surface of the frame 1 without processing the flexible thermal insulation cotton 3 through additional processing. At the same time, the multiple irregular microchannels can better diffuse and take away the heat, which can further reduce the surface temperature of the combustion chamber shell.

[0084] Further, in an embodiment of the present application, if Figure 2 , multiple irregular microchannels are interconnected.

[0085] In this embodiment, the fan 7 can be used to form air convection between the interconnected microchannels, which can more quickly take away the heat emitted through the flexible insulation cotton 3 and further reduce the surface temperature of the combustion chamber shell.

[0086] It should be noted that the plurality of irregular microchannels may be interconnected between adjacent microchannels, or each microchannel may be interconnected with other microchannels.

[0087] In one embodiment of the present application, Figure 4 , Figure 6 , Figure 8 The frame 1 is provided with a plurality of gas ports 102 connecting the gas microchannels C with the outside.

[0088] In this embodiment, the gas microchannel C can take in air through the air port 102 to form air convection in the gas microchannel C, thereby insulating and cooling the flexible insulation cotton 3 and the frame 1, so as to further enhance the insulation effect of the flexible insulation cotton 3 on the frame 1.

[0089] In actual application, air can be introduced through the air port 102 under the natural flow of air, or by utilizing the action of the fan 7, to form air convection in the gas microchannel C, and take away the heat emitted through the flexible insulation cotton 3, which can effectively reduce the surface temperature of the combustion chamber shell.

[0090] In practical applications, the number of the air ports 102 may be determined according to actual conditions. Of course, in order to enhance the air convection effect of the gas microchannels C, a plurality of air ports 102 may be provided on the frame 1 in this embodiment.

[0091] In one embodiment, the plurality of air ports 102 may be distributed in an array on the frame 1 , so that the external air can fully take away the heat of the flexible thermal insulation cotton 3 after entering the gas microchannel C through the plurality of air ports 102 .

[0092] In this embodiment, the shape of the air outlet 102 can also be stable according to actual conditions. For example, the cross-sectional shape of the air outlet 102 can be a strip, a circle, an ellipse, a rectangle, a triangle, etc.

[0093] In one embodiment, in order to ensure the strength of the frame 1 and the air intake of the air port 102 at the same time, the cross-section of the air port 102 can be made into a long strip.

[0094] In one embodiment of the present application, Figures 1 to 5 , the flexible heat-insulating cotton 3 is a porous structure.

[0095] In this embodiment, the flexible thermal insulation cotton 3 has a porous structure, that is, the flexible thermal insulation cotton 3 has a plurality of irregular holes inside. On the one hand, the holes can be connected with the gas microchannel C to form air convection, so that the heat storage capacity of the flexible thermal insulation cotton 3 is lower, thereby reducing the overall heat storage capacity of the combustion chamber shell. 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 5 to heat the stagnant water, which can effectively improve the problem of temperature rise when the water is stopped. On the other hand, the holes can also play a role in sound absorption and noise reduction.

[0096] It should be noted that the porous structure of the flexible thermal insulation cotton 3 may be formed by the fluffy characteristics of the flexible thermal insulation cotton 3 itself, so there is no need to prepare holes on the flexible thermal insulation cotton 3 through additional processes, which can simplify the preparation process and reduce costs.

[0097] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton 3 in this embodiment is controlled 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 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 3 by 1°C is between 0.3 joules and 1.5 joules, so that the flexible thermal insulation cotton 3 can ensure a good thermal insulation effect while effectively reducing thermal conductivity.

[0098] In order to further improve the thermal insulation effect, preferably, the specific heat capacity C of the flexible thermal insulation cotton 3 is between 1.0 J / (gK) and 1.3 J / (gK).

[0099] Furthermore, it is preferred that the specific heat capacity C of the flexible thermal insulation cotton 3 is between 1.0 J / (gK) and 1.1 J / (gK).

[0100] In one embodiment of the present application, considering factors such as heat insulation effect and cost, the flexible heat insulation cotton 3 can be made of silicate fiber, silica fiber or glass fiber. As an example, the flexible heat insulation cotton 3 is made of aluminum silicate fiber cotton with a low density, and the density of aluminum silicate fiber is less than 0.2g / cm3 Its density is much lower than that of conventional hard insulation materials such as aluminum silicate board, which is 0.36g / cm 3 , and is also much smaller than the density of stainless steel used in air cooling, which is 7.93 g / cm 3 Therefore, under the same volume, this embodiment can significantly reduce the heat storage and effectively reduce the water shut-off temperature rise. Preferably, the density of the flexible thermal insulation cotton 3 is 0.128g / cm 3 , to achieve a better effect of reducing heat storage.

[0101] Optionally, in an embodiment of the present application, if Figures 1 to 9 The frame 1 has two mounting plates (113 / 121) located above the combustion chamber A. The two mounting plates (113 / 121) are arranged opposite to each other, and the two mounting plates (113 / 121) are used to connect with the heat exchanger 5 above the frame 1; the flexible thermal insulation cotton 3 is used to cover the heat exchanger 5 to separate the heat exchanger 5 from the corresponding mounting plates (113 / 121).

[0102] In this embodiment, the first mounting plate 113 and the second mounting plate 121 are relatively arranged above the combustion chamber A to form two relatively distributed mounting ports. The two end plates 53 of the heat exchanger 5 are respectively installed at the two mounting ports and are both connected to the first mounting plate 113 and the second mounting plate 121 to form an enclosure. The fin group 51 and the heat exchange tube 52 of the heat exchanger 5 are located in the enclosure. The first mounting plate 113 and the second mounting plate 121 are respectively arranged on opposite sides of the fin group 51. The flexible heat insulation cotton 3 extends upward from the combustion chamber A to the heat exchanger 5. It can be understood that the portion where the flexible heat insulation cotton 3 extends to the heat exchanger 5 is located between the fin group 51 and the corresponding mounting plate (113 / 121), which is used to block the heat transfer between the fin group 51 and the corresponding mounting plate (113 / 121).

[0103] The two mounting plates (113 / 121) are both part of the combustion chamber shell. The heat of the combustion chamber shell corresponding to the combustion chamber A can be easily transferred to the two mounting plates (113 / 121). In this embodiment, the flexible heat insulation cotton 3 is isolated between the fin group 51 and the corresponding mounting plate (113 / 121), which can effectively prevent the heat of the mounting plate (113 / 121) from being transferred to the fin group 51, thereby reducing the water-stop temperature rise. Furthermore, the flexible heat insulation cotton 3 covers the fin group 51 of the heat exchanger 5, so that the heat insulation effect between the mounting plate (113 / 121) and the fin group 51 is better.

[0104] Optionally, the mounting plate (113 / 121) and the frame 1 forming the combustion chamber A can be integrally formed or assembled separately.

[0105] Furthermore, if Figures 1 to 3, the housing 1 includes a bottom frame 11 and a cover plate 12; the bottom frame 11 is provided with an opening; a back plate 111 opposite to the opening of the bottom frame 11 extends upward to form a mounting plate (113 / 121); the cover plate 12 covers the opening of the bottom frame 11 and encloses a combustion chamber A with the bottom frame 11; the cover plate 12 extends upward to form another mounting plate (113 / 121); the flexible heat insulation cotton 3 includes a first heat insulation cotton 31 and a second heat insulation cotton 32, the first heat insulation cotton 31 covers the inner wall surfaces of the bottom frame 11 and the corresponding mounting plate (113 / 121), and the second heat insulation cotton 32 covers the inner wall surfaces of the cover plate 12 and the corresponding mounting plate (113 / 121).

[0106] In this embodiment, the first mounting plate 113 is formed by the upward extension of the back plate 111, and the second mounting plate 121 is formed by the upward extension of the cover plate 12. The two end plates 53 of the heat exchanger 5 are respectively connected and fixed to the upper edges of the two side plates 112 of the bottom frame 11, the side edges of the first mounting plate 113, and the side edges of the second mounting plate 121, and the fin group 51 is clamped between the first mounting plate 113 and the second mounting plate 121.

[0107] It can be understood that the bottom frame 11 and the cover plate 12 are designed as two independent components. In this embodiment, the flexible heat insulation cotton 3 is provided in two parts including the first heat insulation cotton 31 and the second heat insulation cotton 32. Among them, the first heat insulation cotton 31 covers the inner wall surfaces of the bottom frame 11 and the first mounting plate 113, and the second heat insulation cotton 32 covers the inner wall surfaces of the cover plate 12 and the second mounting plate 121, so that the heat insulation cotton on the bottom frame 11 and the cover plate 12 can be installed separately, which is more convenient for assembly operation and improves production efficiency.

[0108] Furthermore, as Figures 3 to 5 , the bottom frame 11 further includes 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 an opening, and the cover plate 12 is connected to the two side plates 112; the first heat insulation cotton 31 is provided on the inner wall surfaces of the back plate 111 and the two side plates 112.

[0109] In this embodiment, the bottom frame 11 includes a back plate 111 and two side plates 112 connected to opposite sides of the back plate 111. The two side plates 112 and the back plate 111 form a frame structure with an open side. Optionally, the cross-sectional shape of the bottom frame 11 generally presents a "C" shape. By covering the cover plate 12 at the opening, the "C" shape structure is roughly changed into a cross-sectional shape of "口" (square), thereby forming a combustion chamber A with upper and lower openings and a closed perimeter.

[0110] In actual application, the back plate 111 and the two side plates 112 of the bottom frame 11 can be an integral structure or a split structure. Optionally, the bottom frame 11 in this embodiment can directly adopt a sheet metal plate to be integrally bent into a "C" - shaped structure, which simplifies the manufacturing process and improves production efficiency. The cover plate 12 and the bottom frame 11 can be assembled by screw fixation or snap - connection fixation, etc. The heat exchanger 5 can be fixed to the two mounting plates (113 / 121) and the corresponding side plates 112 through the end plate 53 by screwing or riveting, etc.

[0111] In actual application, the first heat - insulating cotton 31 can adopt an integral heat - insulating cotton, which is bent into a roughly "C" shape to fit the inner wall surface shape of the bottom frame 11. The part of the first heat - insulating cotton 31 corresponding to the back plate 111 can protrude from the upper edge to cover the inner wall surface of the first mounting plate 113. With such a setting, compared with the way of separately setting a piece of heat - insulating cotton on different wall surfaces, this embodiment can prevent heat from leaking to the combustion chamber shell through the gaps at the joints of the surfaces, and can achieve a better heat - insulating effect.

[0112] In an embodiment of the present application, as Figures 4 to 6 、 Figure 10 to Figure 11 、 Figure 15 to Figure 16 , the first heat - insulating cotton 31 is fixedly connected to the bottom frame 11 through a first fixing structure, and the part of the first heat - insulating cotton 31 corresponding to the heat exchanger 5 is clamped and fixed by the heat exchanger 5 and the corresponding mounting plate (113 / 121).

[0113] This embodiment exemplifies the installation of the first heat - insulating cotton 31. The part of the first heat - insulating cotton 31 corresponding to the bottom frame 11 is fixed through a first fixing structure, and the part of the first heat - insulating cotton 31 corresponding to the heat exchanger 5 is clamped and fixed by the heat exchanger 5 and the first mounting plate 113 during installation. In actual installation, first install the first heat - insulating cotton 31 on the inner wall of the bottom frame 11 and fix it through the first fixing structure, and then install the heat exchanger 5 on the bottom frame 11, so that the heat exchanger 5 and the first mounting plate 113 clamp and fix the first heat - insulating cotton 31 therebetween. With such a setting, there is no need to specially set a fixing structure to fix the flexible heat - insulating cotton 3 at the position corresponding to the heat exchanger 5, which simplifies the assembly structure and improves the assembly efficiency.

[0114] Optionally, the first heat - insulating cotton 31 is an integral structure. While being convenient for installation, it ensures the heat - insulating effect at the joint of the back plate 111 and the side plate 112 of the bottom frame 11, and prevents heat leakage due to the appearance of connection gaps.

[0115] It can be understood that the specific structure of the first fixing structure can be determined according to the actual situation:

[0116] In one embodiment, as Figures 4 to 6The first fixing structure includes a side plate flange 112a bent from the peripheral edge of the side plate 112 toward the combustion chamber A and a claw 114 provided on the side plate flange 112a. The side plate flange 112a covers the corresponding edge of the first heat insulation cotton 31, and the claw 114 cooperates with the surface of the first heat insulation cotton 31 facing the combustion chamber A. 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 at the upper edge, the front edge and the lower edge to support the edge of the first heat insulation cotton 31 at the side plate 112, and then the claw 114 is provided at the side plate flange 112a to clamp the first heat insulation cotton 31, so as to fix the first heat insulation cotton 31. Of course, in this way, the back plate flange 111a and the claw 114 can also be provided at the position corresponding to the edge of the first heat insulation cotton 31 on the back plate 111 to limit and fix the first heat insulation cotton 31 covering the back plate 111. Alternatively, screws may be driven into the back plate 111 to limit and fix the first heat insulating cotton 31 covering the back plate 111 .

[0117] In one embodiment, the first fixing structure includes a plurality of screws (not shown), and the first thermal insulation cotton 31 is installed on the bottom frame 11 by means of the plurality of screws. Optionally, the corresponding first thermal insulation cotton 31 parts may be fixed by screws on both the back panel 111 and the side panel 112; or, the corresponding first thermal insulation cotton 31 parts may be fixed by screws only on the two side panels 112. The specific method is not limited here, as long as it can ensure that the first thermal insulation cotton 31 does not fall off. In actual application, in order to improve the reliability of the first thermal insulation cotton 31, a gasket may be provided at the screw location, and the gasket may be used to increase the limiting area of ​​the first thermal insulation cotton 31, so that the structural reliability of the first thermal insulation cotton 31 can be increased to prevent it from being broken when hit during a drop test or transportation.

[0118] In one embodiment, the first fixed structure includes a limiting net provided on the side of the first thermal insulation cotton 31 facing the combustion chamber A, and the limiting net is fixedly connected to the bottom frame 11 to limit the first thermal insulation cotton 31. It can be understood that since the flexible thermal insulation cotton 3 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 first thermal insulation cotton 31, so as to ensure the structural reliability of the first thermal insulation cotton 31 and 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 bottom frame 11 by welding, screwing, or riveting. Optionally, the limiting net is a metal net.

[0119] In one embodiment, if Figure 10 to Figure 11 , Figure 15 to Figure 16, the first fixed structure includes a pressing plate 2 arranged on the side of the first thermal insulation cotton 31 facing the combustion chamber A, and the pressing plate 2 is fixedly connected to the bottom frame 11 to limit the first thermal insulation cotton 31. It can be understood that by using the pressing plate 2 to fix the first thermal insulation cotton 31 to the bottom frame 11, the limiting area of ​​the first thermal insulation cotton 31 can be increased by the pressing plate 2, so as to increase the structural reliability of the first thermal insulation cotton 31. In actual application, the pressing plate 2 can be fixedly connected to the bottom frame 11 by the fixing member 4, and the fixing member 4 can be fixedly connected to the bottom frame 11 by screws, clamping or flanging, as long as the connection reliability between the pressing plate 2 and the bottom frame 11 can be guaranteed. In addition, the pressing plate 2 can be a long strip pressing plate 2 (such as Figure 10 to Figure 11 ), or a circular tablet 2 (such as Figure 15 to Figure 16 ), square tablet 2, etc.

[0120] It should be noted that, in actual application, the fixing method of the first heat insulating cotton 31 and the bottom frame 11 may not be limited to any one of the above fixing methods, and may be any combination of the above fixing methods, or may also be some other fixing methods.

[0121] In one embodiment of the present application, Figures 7 to 9 , Figure 12 to Figure 14 , Fig.17 The second heat insulating cotton 32 is fixed to the cover plate 12 through a second fixing structure, and the portion of the second heat insulating cotton 32 corresponding to the heat exchanger 5 is clamped and fixed by the heat exchanger 5 and the corresponding mounting plate (113 / 121).

[0122] This embodiment illustrates the installation of the second thermal insulation cotton 32. The portion of the second thermal insulation cotton 32 corresponding to the cover plate 12 is fixed by the second fixing structure, and the portion of the second thermal insulation cotton 32 corresponding to the heat exchanger 5 is fixed by the installation clamping of the heat exchanger 5 and the second mounting plate 121. In actual installation, the second thermal insulation cotton 32 is first installed on the inner wall of the cover plate 12 and fixed by the second fixing structure, and then the cover plate 12 with the second thermal insulation cotton 32 is covered on the bottom frame 11, so that the second mounting plate 121 and the heat exchanger 5 clamp and fix the second thermal insulation cotton 32 therebetween. With such a configuration, there is no need to specially set up a fixing structure to fix the flexible thermal insulation cotton 3 corresponding to the heat exchanger 5, which simplifies the assembly structure and improves the assembly efficiency.

[0123] Optionally, the second heat insulating cotton 32 is an integrated structure, which is convenient for installation and ensures the heat insulation effect of the connection between the part of the cover plate 12 corresponding to the combustion chamber A and the second mounting plate 121, preventing the formation of connection gaps and heat leakage.

[0124] It can be understood that the specific structure of the second fixing structure can be determined according to actual conditions:

[0125] In one embodiment, if Figures 7 to 9, the second fixing structure includes a plurality of screws, and the second thermal insulation cotton 32 is installed on the cover plate 12 by means of the plurality of screws. Optionally, the positions of the screws can be determined according to the actual situation, for example, they can be distributed on the cover plate 12 in an array, or they can be distributed on the cover plate 12 in a ring form, or they can be distributed on the cover plate 12 in a random scattered manner. In actual application, in order to improve the reliability of the second thermal insulation cotton 32, a gasket can be set at the screw position, and the gasket is used to increase the limiting area of ​​the second thermal insulation cotton 32, so that the structural reliability of the second thermal insulation cotton 32 can be increased to prevent it from being broken when it is hit during a drop test or transportation and handling.

[0126] In one embodiment, the second fixed structure includes a limiting net provided on the side of the second thermal insulation cotton 32 facing the combustion chamber A, and the limiting net is fixedly connected to the cover plate 12 to limit the second thermal insulation cotton 32. It can be understood that since the flexible thermal insulation cotton 3 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 second thermal insulation cotton 32, so that the structural reliability of the second thermal insulation cotton 32 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.

[0127] In one embodiment, if Figure 12 to Figure 14 , Fig.17 , the second fixed structure includes a pressing plate 2 arranged on the side of the second thermal insulation cotton 32 facing the combustion chamber A, and the pressing plate 2 is fixedly connected to the cover plate 12 to limit the second thermal insulation cotton 32. It can be understood that by using the pressing plate 2 to fix the second thermal insulation cotton 32 to the cover plate 12, the limiting area of ​​the second thermal insulation cotton 32 can be increased by the pressing plate 2, so as to increase the structural reliability of the second thermal insulation cotton 32. In actual application, the pressing plate 2 can be fixedly connected to the cover plate 12 by the fixing member 4, and the fixing member 4 can be fixedly connected to the cover plate 12 by screws or clamping, as long as the connection reliability between the pressing plate 2 and the cover plate 12 can be guaranteed. In addition, the pressing plate 2 can be a long strip pressing plate 2 (such as Figure 12 to Figure 14 ), or a circular tablet 2 (such as Fig.17 ), square tablet 2, etc.

[0128] It should be noted that, in actual application, the fixing method of the second heat insulating cotton 32 and the cover plate 12 may not be limited to any one of the above fixing methods, and may be any combination of the above fixing methods, or may also be some other fixing methods.

[0129] The utility model also provides a gas water heater, such as Figures 18 to 21The gas water heater comprises a burner 6, a heat exchanger 5, a fan 7 and a combustion chamber housing. The specific structure of the combustion chamber housing is referred to the above embodiment. Since the gas water heater adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the heat exchanger 5 is arranged above the combustion chamber A, and the burner 6 is arranged below the combustion chamber A.

[0130] It can be understood that the type of the gas water heater can be a forced-draft water heater, in which case the fan 7 is arranged above the heat exchanger 5 to drive the airflow by negative pressure suction; or it can be a blower-type water heater, in which case the fan 7 is arranged below the burner 6 to drive the airflow by blowing air.

[0131] Optionally, the fan can be used to continue to rotate for a preset time when the burner 6 is stopped to perform cooling and post-cleaning actions.

[0132] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A combustion chamber casing, characterized in that: include: a frame, the inner cavity of which forms a combustion chamber; Flexible thermal insulation cotton is arranged on the inner wall surface of the frame and contacts the inner wall surface of the frame, and is at least arranged around the combustion chamber. The surface where the flexible thermal insulation cotton contacts the frame is concave and convex, so that a gas microchannel is formed between the flexible thermal insulation cotton and the frame.

2. The combustion chamber housing according to claim 1, characterized in that The gas microchannel includes a plurality of irregular microchannels.

3. The combustion chamber housing according to claim 2, characterized in that The plurality of irregular microchannels are interconnected.

4. The combustion chamber housing according to any one of claims 1 to 3, characterized in that The flexible heat-insulating cotton has a porous structure.

5. The combustion chamber housing according to any one of claims 1 to 3, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

6. The combustion chamber housing according to claim 5, characterized in that The specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0 J / (gK)≤C≤1.3 J / (gK).

7. The combustion chamber housing according to any one of claims 1 to 3, characterized in that The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber; The density of the flexible thermal insulation cotton is less than 0.2g / cm 3 .

8. The combustion chamber housing according to any one of claims 1 to 3, characterized in that The frame is provided with a plurality of gas ports connecting the gas microchannel with the outside.

9. The combustion chamber housing according to any one of claims 1 to 3, characterized in that The frame has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the two mounting plates are used to connect to the heat exchanger above the frame; The flexible heat insulating cotton is used to cover the heat exchanger to separate the heat exchanger from the corresponding mounting plate.

10. The combustion chamber housing according to claim 9, characterized in that The frame comprises: A bottom frame having an opening; a back plate of the bottom frame opposite to the opening extending upward to form the mounting plate; and A cover plate, which covers the opening of the bottom frame and is enclosed with the bottom frame to form the combustion chamber; the cover plate extends upward to form another mounting plate; The flexible thermal insulation cotton includes a first thermal insulation cotton and a second thermal insulation cotton. The first thermal insulation cotton covers the bottom frame and the corresponding inner wall surface of the mounting plate, and the second thermal insulation cotton covers the cover plate and the corresponding inner wall surface of the mounting plate.

11. The combustion chamber housing according to claim 10, characterized in that The bottom frame further includes two side panels arranged on opposite sides of the back panel, the back panel and the two side panels enclose a cavity with an open opening, and the cover panel is connected to the two side panels; The first heat insulating cotton is arranged on the inner wall surfaces of the back plate and the two side plates.

12. The combustion chamber housing according to claim 11, characterized in that The first heat-insulating cotton is fixedly connected to the bottom frame via a first fixing structure, and the portion of the first heat-insulating cotton corresponding to the heat exchanger is clamped and fixed by the heat exchanger and the corresponding mounting plate.

13. The combustion chamber housing according to claim 12, characterized in that The first fixing structure includes a flange provided on the bottom frame to cover the edge of the first thermal insulation cotton, the flange is provided with a claw, and the claw is limitedly engaged with the surface of the first thermal insulation cotton away from the bottom frame; And / or, the first fixing structure includes a plurality of screws, and the first heat insulation cotton is installed on the bottom frame through the screws; And / or, the first fixing structure includes a limiting net provided on the side of the first heat-insulating cotton facing the combustion chamber, and the limiting net is fixedly connected to the bottom frame to limit the first heat-insulating cotton; And / or, the first fixing structure includes a pressing plate arranged on the side of the first thermal insulation cotton facing the combustion chamber, and the pressing plate is fixedly connected to the bottom frame to limit the first thermal insulation cotton.

14. The combustion chamber housing according to claim 10, characterized in that The second heat-insulating cotton is fixed to the cover plate via a second fixing structure, and the portion of the second heat-insulating cotton corresponding to the heat exchanger is clamped and fixed to the corresponding mounting plate via the heat exchanger.

15. The combustion chamber housing according to claim 14, characterized in that The second fixing structure includes a plurality of screws, and the second heat insulation cotton is installed on the cover plate through the screws; And / or, the second fixing structure includes a limiting net provided on the side of the second heat insulation cotton facing the combustion chamber, and the limiting net is fixedly connected to the cover plate to limit the second heat insulation cotton; And / or, the second fixing structure includes a pressing plate arranged on the side of the second thermal insulation cotton facing the combustion chamber, and the pressing plate is fixedly connected to the cover plate to limit the second thermal insulation cotton.

16. The combustion chamber housing according to claim 10, characterized in that The first thermal insulation cotton is an integrated structure; and / or the second thermal insulation cotton is an integrated structure.

17. A gas water heater, characterized in that: It comprises a burner, a heat exchanger, a fan and a combustion chamber housing according to any one of claims 1 to 16, wherein the heat exchanger is arranged above the combustion chamber and the burner is arranged below the combustion chamber; The fan is arranged above the heat exchanger, or the fan is arranged below the burner.

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