Gas water heater

Abstract

The utility model discloses a gas water heater, and relates to the technical field of gas equipment. The gas water heater comprises a combustion chamber shell, a heat exchanger and flexible heat insulation cotton. A combustion chamber is formed in an inner cavity of the combustion chamber shell. The heat exchanger is positioned above the combustion chamber; the flexible heat insulation cotton is arranged on the inner wall face of the combustion chamber shell and at least surrounds the combustion chamber. 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 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, the shell of the combustion chamber is set as a double-layer shell to form an air cooling channel, and the outer surface of the shell of the combustion chamber is cooled by air cooling. However, this method 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 gas water heater, which aims 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 gas water heater proposed by the utility model comprises:

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

[0008] a heat exchanger located above the combustion chamber; and

[0009] Flexible heat-insulating cotton is arranged on the inner wall surface of the combustion chamber shell and at least surrounds the combustion chamber.

[0010] In one embodiment of the present application, the flexible thermal insulation cotton at least partially covers the heat exchanger.

[0011] In one embodiment of the present application, the combustion chamber housing has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the heat exchanger is installed between the two mounting plates;

[0012] The flexible heat insulating cotton covers the heat exchanger to separate the heat exchanger from the corresponding mounting plate.

[0013] In one embodiment of the present application, the combustion chamber housing includes:

[0014] 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

[0015] A cover plate is arranged on the open side of the bottom frame to enclose the bottom frame to form the combustion chamber; the cover plate extends upward to form another mounting plate;

[0016] 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.

[0017] In one embodiment of the present application, the first thermal insulation cotton is fixed to the bottom frame through 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.

[0018] In one embodiment of the present application, the bottom frame further includes two side panels disposed on opposite sides of the back panel, and the cover panel is connected to the two side panels;

[0019] The first fixing structure includes a first flange bent from the peripheral edge of the side plate toward the combustion chamber and a clamping claw provided on the first flange, the first flange covers the corresponding edge of the first thermal insulation cotton, and the clamping claw is limitedly matched with the surface of the first thermal insulation cotton facing the combustion chamber;

[0020] 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 plurality of screws;

[0021] 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;

[0022] 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.

[0023] 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.

[0024] 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 plurality of screws;

[0025] 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;

[0026] 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.

[0027] 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.

[0028] 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).

[0029] 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).

[0030] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber; the density of the flexible thermal insulation cotton is less than 0.2g / cm3.

[0031] In one embodiment of the present application, the flexible thermal insulation cotton is a porous structure; the surface of the flexible thermal insulation cotton in contact with the inner wall surface of the combustion chamber shell 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 combustion chamber shell.

[0032] In one embodiment of the present application, the combustion chamber shell is provided with a plurality of convex bumps toward the combustion chamber, and the plurality of convex bumps abut against the flexible heat insulating cotton, so that a plurality of air gaps are formed between the flexible heat insulating cotton and the inner wall surface of the combustion chamber shell;

[0033] The combustion chamber shell is provided with a plurality of air ports communicating the air gap with the outside.

[0034] In one embodiment of the present application, the gas water heater further comprises a plurality of screws, a mounting hole is provided at the convex portion, and the screws pass through the flexible heat insulating cotton and the mounting holes in sequence from the inside to the outside and are fixed to the combustion chamber shell.

[0035] In one embodiment of the present application, the gas water heater further includes:

[0036] a burner, disposed below the combustion chamber shell; and

[0037] A fan can be used to continue rotating for a preset time when the burner is stopped to perform a post-cleaning action.

[0038] In one embodiment of the present application, the fan is disposed above the heat exchanger;

[0039] Alternatively, the fan is arranged below the burner.

[0040] In the gas water heater of the technical solution of the utility model, by setting a flexible heat insulation cotton on the inner wall surface of the combustion chamber shell, the flexible heat insulation cotton is at least arranged around the combustion chamber, 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 combustion chamber shell, reduce the surface temperature of the combustion chamber shell, and reduce the heat storage of the combustion chamber shell; therefore, when the gas water heater stops discharging water, the combustion chamber shell with low heat storage will not transfer too much heat to the heat exchanger to heat the stagnant water. Compared with the method of using a double-layer or multi-layer shell to set an air cooling channel in the related art, this embodiment can effectively improve the problem of temperature rise when water is stopped. It can be seen that this embodiment can reduce the surface temperature of the combustion chamber shell and effectively improve the problem of temperature rise when water is stopped. In addition, the structure of this embodiment can also reduce the noise of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 This is a schematic structural diagram of an embodiment of the utility model gas water heater;

[0043] Figure 2 for Figure 1 An exploded schematic diagram of an embodiment;

[0044] Figure 3 It is a partial cross-sectional view of an embodiment of the gas water heater of the utility model;

[0045] Figure 4 This is a schematic diagram of the structural coordination of the combustion chamber, the heat exchanger and the flexible heat insulation cotton in the embodiment of the utility model;

[0046] Figure 5 This is a schematic diagram of the structural coordination between the bottom frame and the first heat insulation cotton in the embodiment of the utility model;

[0047] Figure 6 for Figure 5 An exploded schematic diagram of an embodiment;

[0048] Figure 7 This is a schematic diagram of the structure of the bottom frame in the embodiment of the utility model;

[0049] Figure 8 This is a schematic diagram of the structure in which the flexible heat-insulating cotton is fixed to the bottom frame through a pressing sheet in an embodiment of the utility model;

[0050] Fig. 9 It is a schematic diagram of the explosion structure of the cover plate and the second heat insulation cotton in the embodiment of the utility model;

[0051] Fig.10 This is a schematic diagram of the structure in which the flexible heat-insulating cotton is fixed to the cover plate through a pressing sheet in an embodiment of the utility model.

[0052] Description of Figure Numbers:

[0053]

[0054]

[0055] 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

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] A gas water heater is a device that produces hot water by burning gas and exchanging heat 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, the shell of the combustion chamber is set as a double-layer or triple-layer shell to form an air cooling channel, and the outer surface of the shell of the combustion chamber is cooled by air cooling.

[0061] 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 fin group 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 technology, it is precisely because the shell of the combustion chamber is set as a double-layer or triple-layer sheet metal that the total heat storage of the shell of the combustion chamber increases, and more heat is transferred to the heat exchanger to heat the stagnant water, further aggravating the problem of excessive water stop temperature rise.

[0062] Based on this, the utility model proposes a gas water heater, which aims to reduce the surface temperature of the combustion chamber shell and solve the problem of temperature rise when water is cut off. The structure of the gas water heater is described below in the form of an embodiment.

[0063] like Figures 1 to 4 As shown, the gas water heater includes a combustion chamber shell 1, a heat exchanger 2 and a flexible thermal insulation cotton 3.

[0064] The inner cavity of the combustion chamber shell 1 forms a combustion chamber A; the heat exchanger 2 is located above the combustion chamber A; the flexible heat insulation cotton 3 is arranged on the inner wall surface of the combustion chamber shell 1 and at least surrounds the combustion chamber A.

[0065] It can be understood that the gas water heater also includes a burner 4 and a fan 5, and the burner 4 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 2 to heat the device to be heated in the heat exchanger 2 (such as a water pipe). The fan 5 drives the gas and air into the combustion chamber for combustion and transports the high-temperature flue gas after combustion to the heat exchanger 2 for heat exchange, and then discharges the exhaust gas after heat exchange. In actual application, the type of this gas water heater can be a strong suction type 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 also be a blast type water heater, in which case the fan 5 is arranged below the burner 4 to drive the airflow by blowing air.

[0066] It can be understood that the heat exchanger 2 is located above the combustion chamber A, and the heat exchanger 2 can be installed in the combustion chamber shell 1, or the heat exchanger 2 can be installed above the combustion chamber shell 1. When the heat exchanger 2 is installed in the combustion chamber shell 1, the combustion chamber shell 1 can be directly coated on the outside of the fin group 21 of the heat exchanger 2, or the combustion chamber shell 1 can be coated on the outside of the shell of the heat exchanger 2 itself, such as the outside of the copper sheet. When the heat exchanger 2 is installed above the combustion chamber shell 1, the heat exchanger 2 itself has an independent shell, which is assembled with the combustion chamber shell 1.

[0067] In this embodiment, by setting a flexible heat-insulating cotton 3 on the inner wall surface of the combustion chamber shell 1, the flexible heat-insulating cotton 3 is at least arranged around the combustion chamber A, which can play a role in isolating the high-temperature flue gas from the combustion chamber shell 1, preventing the heat in the combustion chamber A from being transferred to the combustion chamber shell 1, and achieving the purpose of reducing the surface temperature of the combustion chamber shell 1. At the same time, the flexible heat-insulating cotton 3 isolates the heat from being transferred to the combustion chamber shell 1, and the heat storage capacity of the combustion chamber shell 1 is reduced. Therefore, when the user stops using water, the combustion chamber shell 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 2 to heat the stagnant water. Therefore, compared with the method of using a double-layer or multi-layer shell to set an air cooling channel in the related art, this embodiment can effectively improve the problem of temperature rise when water is stopped.

[0068] It should be noted that in this embodiment, the inner wall surface of the combustion chamber shell 1 is provided with a flexible heat-insulating cotton 3, which has the characteristics of flexibility and heat insulation. Compared with the heat-insulating method of using a heat-insulating cotton board (usually the heat-insulating material is pressed into a board body by glue) in the related art, the density of the flexible heat-insulating cotton 3 in this embodiment is lower, and its soft, cotton and other fluffy characteristics can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need for an additional shock-absorbing structure. On the other hand, compared with the air-cooling method used in the related art, this structure uses a flexible heat-insulating cotton 3 to isolate the heat inside the combustion chamber A, which improves the heat utilization rate and does not require additional cooling air. Then, under the same heat demand, the air volume of the fan 5 required in this embodiment is lower, and the speed of the fan 5 is reduced, thereby reducing the noise from the vibration source. It can be seen from this that this embodiment can reduce the noise of the vibration source on the one hand, and absorb the sound on the path of sound propagation on the other hand, achieving a better noise reduction effect.

[0069] In actual application, the specific structural shape of the flexible thermal insulation 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 combustion chamber shell 1, or it can be adapted only to the shape around the combustion chamber A, or it can also be other shapes, etc. In this embodiment, in order to achieve a better thermal insulation effect, the flexible thermal insulation cotton 3 is at least arranged around the combustion chamber A. It can be understood that the flexible thermal insulation cotton 3 is only arranged around the combustion chamber A, or the flexible thermal insulation cotton 3 can be arranged in other parts besides the combustion chamber A, such as the heat exchanger 2, the flue, etc. The specific material of the flexible thermal insulation cotton 3 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, silicate thermal insulation cotton, silica thermal insulation cotton or thermal insulation cotton of other materials, etc., as long as it can play a role in fire prevention and thermal insulation.

[0070] In summary, in the gas water heater of the utility model technical solution, by setting a flexible heat insulation cotton 3 on the inner wall surface of the combustion chamber shell 1, the flexible heat insulation cotton 3 is at least arranged around the combustion chamber A, so that when the gas water heater is working normally, the flexible heat insulation cotton 3 can block the heat in the combustion chamber A from being transferred to the combustion chamber shell 1, reduce the surface temperature of the combustion chamber shell 1, and reduce the heat storage of the combustion chamber shell 1; so that when the gas water heater stops discharging water, the combustion chamber shell 1 with low heat storage will not transfer too much heat to the heat exchanger 2 to heat the stagnant water. Compared with the method of using a double-layer or multi-layer shell to set an air cooling channel in the related art, this embodiment 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 1 and 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.

[0071] In one embodiment of the present application, Figures 2 to 4 , the flexible thermal insulation cotton 3 at least partially covers the heat exchanger 2 .

[0072] In this embodiment, the flexible thermal insulation cotton 3 at least partially covers the heat exchanger 2 to isolate the heat transfer between the combustion chamber shell 1 and the heat exchanger 2. This can prevent the heat of the combustion chamber shell 1 from being transferred to the heat exchanger 2 and causing the temperature to rise when the water supply is stopped.

[0073] In addition, it should be noted that when the user turns off the water midway, the fan 5 has a post-cleaning action (after the burner stops burning, the fan 5 still runs for a preset time to discharge the smoke in the combustion chamber A. Optionally, the preset time for the post-cleaning movement of the fan 5 can be about 1 minute). This action can draw in external cold air to cool the flexible insulation cotton 3 and the fin group 21 of the heat exchanger 2, but the cooling effect on the combustion chamber shell 1 is limited. Then, the temperature of the combustion chamber shell 1 may be higher than the temperature of the fin group 21 of the heat exchanger 2. In this embodiment, the flexible insulation cotton 3 at least partially covers the heat exchanger 2 to isolate the combustion chamber shell 1 from the heat exchanger 2, which can effectively prevent the higher temperature combustion chamber shell 1 from transferring its own heat to the heat exchanger 2 after the water is stopped.

[0074] In actual application, the flexible heat-insulating cotton 3 covering the heat exchanger 2 and the flexible heat-insulating cotton 3 arranged on the inner wall of the combustion chamber A can be a separate structure or an integrated structure.

[0075] It can be understood that the heat exchanger 2 includes two end plates 23, a fin group 21 arranged between the two end plates 23, and a heat exchange tube 22 passing through the fin group 21, and the heat exchange tube 22 is fixed to the two end plates 23. In actual application, the two end plates 23 of the heat exchanger 2 are respectively installed at the left and right ends of the combustion chamber shell 1, and the upper and lower sides of the heat exchanger 2 need to ensure smooth flow of flue gas, so the flexible heat insulation cotton 3 at least covers the front and rear sides of the fin group 21 of the heat exchanger 2 to prevent heat transfer between the fin group 21 and the combustion chamber shell 1. Optionally, the flexible heat insulation cotton 3 can partially cover the front and rear side surfaces of the fin group 21 of the heat exchanger 2, or can also completely cover the front and rear side surfaces of the fin group 21 of the heat exchanger 2.

[0076] Furthermore, if Figures 2 to 4 The combustion chamber housing 1 has two mounting plates (a first mounting plate 131 and a second mounting plate 132) located above the combustion chamber A. The two mounting plates (131 / 132) are arranged opposite to each other, and the heat exchanger 2 is installed between the two mounting plates (131 / 132); the flexible thermal insulation cotton 3 fully covers the heat exchanger 2 to separate the heat exchanger 2 from the corresponding mounting plates (131 / 132).

[0077] In this embodiment, the first mounting plate 131 and the second mounting plate 132 are relatively arranged above the combustion chamber A to form two relatively distributed mounting ports. The two end plates 23 of the heat exchanger 2 are respectively installed at the two mounting ports and are both connected to the first mounting plate 131 and the second mounting plate 132 to form an enclosure. The fin group 21 and the heat exchange tube 22 of the heat exchanger 2 are located in the enclosure. The first mounting plate 131 and the second mounting plate 132 are respectively arranged on opposite sides of the fin group 21. The flexible heat insulation cotton 3 extends upward from the combustion chamber A to the heat exchanger 2. It can be understood that the portion where the flexible heat insulation cotton 3 extends to the heat exchanger 2 is located between the fin group 21 and the corresponding mounting plate (131 / 132), which is used to block the heat transfer between the fin group 21 and the corresponding mounting plate (131 / 132).

[0078] The two mounting plates (131 / 132) are both part of the combustion chamber housing 1. The heat of the portion of the combustion chamber housing 1 corresponding to the combustion chamber A can be easily transferred to the two mounting plates (131 / 132). In this embodiment, the flexible heat insulation cotton 3 is isolated between the fin group 21 and the corresponding mounting plate (131 / 132), which can effectively prevent the heat of the mounting plate (131 / 132) from being transferred to the fin group 21, thereby reducing the water-stop temperature rise. Furthermore, the flexible heat insulation cotton 3 covers the fin group 21 of the heat exchanger 2, so that the heat insulation effect between the mounting plate and the fin group 21 is better.

[0079] Optionally, the mounting plate (131 / 132) and the combustion chamber housing 1 forming the combustion chamber A may be integrally formed or assembled separately.

[0080] Specifically, Figure 2 as well as Figures 5 to 7 The combustion chamber shell 1 includes a bottom frame 11 and a cover plate 12, and an opening is provided on one side of the bottom frame 11; a back plate 111 of the bottom frame 11 opposite to the opening extends upward to form a first mounting plate 131; the cover plate 12 is covered at the opening of the bottom frame 11 to enclose the bottom frame 11 to form a combustion chamber A; the cover plate 12 extends upward to form a second mounting plate 132; the flexible thermal insulation cotton 3 includes a first thermal insulation cotton 31 and a second thermal insulation cotton 32, the first thermal insulation cotton 31 covers the inner wall surface of the bottom frame 11 and the first mounting plate 131, and the second thermal insulation cotton 32 covers the inner wall surface of the cover plate 12 and the second mounting plate 132.

[0081] 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 one side open. Optionally, the cross-sectional shape of the bottom frame 11 generally presents a "C" shape. By covering the cover plate 12 at the open side, the "C" shape structure is roughly changed into a structure with a cross-sectional shape of "口" (square), thereby forming a combustion chamber A with upper and lower openings and a closed perimeter. Among them, the first mounting plate 131 extends upward from the back plate 111, and the second mounting plate 132 extends upward from the cover plate 12. The two end plates 23 of the heat exchanger 2 are respectively connected and fixed to the upper edges of the two side plates 112, the side edges of the first mounting plate 131, and the side edges of the second mounting plate 132. The fin group 21 is clamped between the first mounting plate 131 and the second mounting plate 132.

[0082] In practical applications, the bottom frame 11 can directly use a sheet metal plate to be integrally bent into a "C" shape structure, which simplifies the manufacturing process and improves production efficiency. The assembly of the cover plate 12 and the bottom frame 11 can be fixed by screws or snap connections, etc. The heat exchanger 2 can be fixed to the two mounting plates (131 / 132) and the corresponding side plates 112 by screwing or riveting the end plates 23, etc.

[0083] It can be understood that the bottom frame 11 and the cover plate 12 are 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 131, and the second heat insulation cotton 32 covers the inner wall surfaces of the cover plate 12 and the second mounting plate 132, 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 operations and improves production efficiency.

[0084] In practical applications, the first heat insulation cotton 31 can use an integral heat insulation cotton, which is bent into a roughly "C" shape to fit the shape of the inner wall surface of the bottom frame 11. The part of the first heat insulation 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 131. With this setting, compared with the method of separately setting a piece of heat insulation cotton on different wall surfaces, this embodiment can prevent heat from leaking to the combustion chamber housing 1 through the gaps at the joints of the surfaces, and can achieve a better heat insulation effect.

[0085] In an embodiment of the present application, as Figures 5 to 8 , the first heat insulation cotton 31 is fixed to the bottom frame 11 through the first fixing structure, and the part of the first heat insulation cotton 31 corresponding to the heat exchanger 2 is clamped and fixed by the heat exchanger 2 and the first mounting plate 131.

[0086] This embodiment illustrates the installation of the first thermal insulation cotton 31. The first thermal insulation cotton 31 is fixed to the part corresponding to the bottom frame 11 by the first fixing structure, and the part corresponding to the heat exchanger 2 by the installation clamping of the heat exchanger 2 and the first mounting plate 131. In actual installation, the first thermal insulation cotton 31 is first installed on the inner wall of the bottom frame 11 and fixed by the first fixing structure, and then the heat exchanger 2 is installed on the bottom frame 11, so that the heat exchanger 2 and the first mounting plate 131 clamp and fix the first thermal insulation cotton 31 therebetween. With such a setting, there is no need to specially set up a fixing structure to fix the flexible thermal insulation cotton 3 corresponding to the heat exchanger 2, which simplifies the assembly structure and improves the assembly efficiency.

[0087] Optionally, the first heat insulating cotton 31 is an integrated structure, which is convenient for installation and ensures the heat insulation effect at the connection between the boards of the bottom frame 11, preventing the formation of connection gaps and heat leakage.

[0088] It can be understood that the specific structure of the first fixing structure can be determined according to actual conditions:

[0089] In one embodiment, the first fixing structure includes a first flange 141 bent from the peripheral edge of the side plate 112 toward the combustion chamber A and a claw 142 provided on the first flange 141. The first flange 141 covers the edge of the corresponding first thermal insulation cotton 31, and the claw 142 cooperates with the surface of the first thermal insulation cotton 131 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 first flange 141 is provided at the upper edge, the front edge, and the lower edge to support the edge of the first thermal insulation cotton 31 at the side plate 112, and then the claw 142 is provided at the first flange 141 to clamp the first thermal insulation cotton 31, thereby fixing the first thermal insulation cotton 31. Of course, in this way, flanges and claws can also be provided at the position corresponding to the edge of the first thermal insulation cotton 31 on the back plate 111 to limit and fix the first thermal 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 .

[0090] 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.

[0091] 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 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.

[0092] In one embodiment, if Figure 8 , the first fixed structure includes a pressing plate 15 provided on the side of the first thermal insulation cotton 31 facing the combustion chamber A, and the pressing plate 15 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 be broken when it is hit during a drop test or transportation and handling. In this embodiment, the pressing plate 15 is provided to limit the first thermal insulation cotton 31 to ensure the structural reliability of the first thermal insulation cotton 31 and prevent it from being broken when it is hit during a drop test or transportation and handling. Optionally, the pressing plate 15 is a strip pressing plate or a circular gasket, which can be fixed to the bottom frame 11 by welding, screwing, or riveting. Optionally, the pressing plate 15 is a metal sheet.

[0093] 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.

[0094] In one embodiment of the present application, Fig. 9 and Fig.10 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 2 is clamped and fixed by the heat exchanger 2 and the second mounting plate 132 .

[0095] 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 2 is fixed by the installation clamping of the heat exchanger 2 and the second mounting plate 132. During the 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 132 and the heat exchanger 2 clamp and fix the second thermal insulation cotton 32 therebetween. With such a setting, there is no need to specially set up a fixing structure to fix the flexible thermal insulation cotton 3 corresponding to the heat exchanger 2, which simplifies the assembly structure and improves the assembly efficiency.

[0096] 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 132, preventing the formation of connection gaps and heat leakage.

[0097] It can be understood that the specific structure of the second fixing structure can be determined according to actual conditions:

[0098] In one embodiment, 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.

[0099] 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.

[0100] In one embodiment, if Fig.10, the second fixed structure includes a pressing plate 15 arranged on the side of the second thermal insulation cotton 32 facing the combustion chamber A, and the pressing plate 15 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 be broken when it is hit during a drop test or transportation and handling. In this embodiment, the pressing plate 15 is set to limit the second thermal insulation cotton 32 to ensure the structural reliability of the second thermal insulation cotton 32 and prevent it from being broken when it is hit during a drop test or transportation and handling. Optionally, the pressing plate 15 is a strip pressing plate or a circular gasket, which can be fixed to the cover plate 12 by welding, screwing, or riveting. Optionally, the pressing plate 15 is a metal sheet.

[0101] 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.

[0102] In one embodiment of the present application, the specific heat capacity C of the flexible thermal insulation cotton 3 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 3 by 1°C is between 0.3 joules and 1.5 joules, which ensures a good thermal insulation effect while reducing thermal conductivity.

[0103] 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).

[0104] 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).

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

[0106] Furthermore, the flexible thermal insulation cotton 3 is a porous structure; the surface of the flexible thermal insulation cotton 3 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 between the flexible thermal insulation cotton 3 and the inner wall surface of the combustion chamber shell 1 (not shown in the figure).

[0107] It is understandable that the density of the flexible thermal insulation cotton 3 is lower than that of the cardboard structure, so at the same volume, the mass of the flexible thermal insulation cotton 3 is lower, and the heat storage capacity is also lower. The internal structure of the flexible thermal insulation cotton 3 is relatively fluffy and porous, and the surface of the flexible thermal insulation cotton 3 is uneven. When the flexible thermal insulation cotton 3 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 3 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 insulation effect, and on the other hand, it can play a role in sound absorption and noise reduction.

[0108] To further improve the thermal insulation effect, Figures 4 to 9 In one embodiment, the combustion chamber shell 1 is provided with a plurality of convex bumps 101 protruding toward the combustion chamber A, and the plurality of convex bumps 101 press against the flexible thermal insulation cotton 3 to form a plurality of air gaps B between the flexible thermal insulation cotton 3 and the inner wall surface of the combustion chamber shell 1; the combustion chamber shell 1 is provided with a plurality of air ports 102 connecting the air gaps B with the outside.

[0109] In this embodiment, by setting a plurality of convex bumps 101 on the combustion chamber shell 1, the plurality of convex bumps 101 can lift up the flexible thermal insulation cotton 3 so that a plurality of air gaps B are formed between the flexible thermal insulation cotton 3 and the inner wall surface of the combustion chamber shell 1. The air gaps B can let in cold air through the air port 102, thereby insulating and cooling the flexible thermal insulation cotton 3 and the combustion chamber shell 1, and further improving the thermal insulation effect of the flexible thermal insulation cotton 3 on the combustion chamber shell 1. In actual application, the number of convex bumps 101 can be determined according to actual conditions, and no limitation is made here. Optionally, the convex bumps 101 can be manufactured by a stamping process. The air port 102 can be a circular hole, a triangular hole, a square hole or a hole of other shapes.

[0110] In one embodiment, the gas water heater further comprises a plurality of screws, and a mounting hole 101a is provided at the convex portion 101 , and the screws pass through the flexible heat insulating cotton 3 and the mounting hole 101a from the inside to the outside in sequence and are fixed to the combustion chamber shell 1 .

[0111] In this embodiment, the flexible heat-insulating cotton 3 is fixed to the combustion chamber shell 1 by screwing. A mounting hole 101a is provided at the convex bump 101, so that the convex bump 101 can play a role in positioning the screw. When the screw is installed, the convex bump 101 can also form an avoidance groove for screw installation, and the screw will not protrude from the outer surface of the combustion chamber shell 1, making the appearance of the combustion chamber shell 1 smoother, and will not interfere with the casing of the gas water heater. In actual application, the mounting holes 101a can be provided on only a few of the convex bumps 101 to assemble the screws, as long as the flexible heat-insulating cotton 3 can be ensured not to fall off.

[0112] 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 gas water heater, characterized in that: include: A combustion chamber housing, the inner cavity of which forms a combustion chamber; a heat exchanger, located above the combustion chamber; as well as Flexible heat-insulating cotton is arranged on the inner wall surface of the combustion chamber shell and at least surrounds the combustion chamber.

2. The gas water heater according to claim 1, characterized in that: The flexible thermal insulation wool at least partially covers the heat exchanger.

3. The gas water heater according to claim 2, characterized in that: The combustion chamber housing has two mounting plates located above the combustion chamber, the two mounting plates are arranged opposite to each other, and the heat exchanger is installed between the two mounting plates; The flexible heat insulating cotton covers the heat exchanger to separate the heat exchanger from the corresponding mounting plate.

4. The gas water heater according to claim 3, characterized in that: The combustion chamber housing 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.

5. The gas water heater according to claim 4, characterized in that: The first heat-insulating cotton is fixed 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 to the corresponding mounting plate via the heat exchanger.

6. The gas water heater according to claim 5, characterized in that: The bottom frame further includes two side panels arranged on opposite sides of the back panel, and the cover panel is connected to the two side panels; The first fixing structure includes a first flange bent from the peripheral edge of the side plate toward the combustion chamber and a clamping claw provided on the first flange, the first flange covers the edge of the first thermal insulation cotton, and the clamping claw is limitedly matched with the surface of the first thermal insulation cotton facing the combustion chamber; 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.

7. The gas water heater according to claim 4, 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.

8. The gas water heater according to claim 7, 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.

9. The gas water heater according to any one of claims 4 to 8, characterized in that: The first thermal insulation cotton is an integrated structure; and / or the second thermal insulation cotton is an integrated structure.

10. The gas water heater according to any one of claims 1 to 8, characterized in that: The specific heat capacity C of the flexible thermal insulation cotton satisfies: 0.3J / (gK)≤C≤1.5J / (gK).

11. The gas water heater according to claim 10, characterized in that: The specific heat capacity C of the flexible thermal insulation cotton satisfies: 1.0 J / (gK)≤C≤1.3 J / (gK).

12. The gas water heater according to any one of claims 1 to 8, characterized in that: The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber; The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

13. The gas water heater according to claim 12, characterized in that: The flexible thermal insulation cotton has a porous structure; the surface of the flexible thermal insulation cotton facing the inner wall of the combustion chamber shell is concave-convex, so that there are multiple irregular gas microchannels between the flexible thermal insulation cotton and the combustion chamber shell.

14. The gas water heater according to claim 12, characterized in that: The combustion chamber shell is provided with a plurality of convex bumps toward the combustion chamber, and the convex bumps abut against the flexible heat insulating cotton to form a plurality of air gaps between the flexible heat insulating cotton and the combustion chamber shell; The combustion chamber shell is provided with a plurality of air ports communicating the air gap with the outside.

15. The gas water heater according to claim 14, characterized in that: The gas water heater also includes a plurality of screws. A mounting hole is provided at the convex portion. The screws sequentially pass through the flexible heat-insulating cotton and the mounting hole and are fixed to the combustion chamber shell.

16. The gas water heater according to any one of claims 1 to 8, characterized in that: The gas water heater also includes: a burner, disposed below the combustion chamber shell; and The fan can be used to continue to rotate for a preset time when the burner is stopped to perform a post-cleaning action.

17. The gas water heater according to claim 16, characterized in that: The fan is arranged above the heat exchanger; Alternatively, the fan is arranged below the burner.

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