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 water heaters. Wherein the combustion chamber shell comprises a frame body, a heat insulation layer and a fixing frame, a combustion chamber is formed in an inner cavity of the frame body, and a mounting plate used for being connected with a heat exchanger is arranged at the position, above the combustion chamber, of the frame body; the heat insulation layer is arranged on the inner wall surface of the frame body, is at least arranged on the mounting plate and is used for separating the mounting plate from the fin group of the heat exchanger; the fixing frame is arranged on the side, away from the mounting plate, of the heat insulation layer and fixedly connected with the frame to limit the heat insulation layer. The position, corresponding to the fin set, of the fixing frame is arranged in a clearance mode. According to the technical scheme, the water cut-off temperature rise of the gas water heater can be effectively improved.

Description

Technical Field

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

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

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

[0004] In the related art, a heat insulation layer is provided on the inner wall of the combustion chamber shell to insulate and cool down. When fixing, the heat insulation layer is usually fixed with fixing parts, but the heat of the fixing parts will be transferred to the heat exchanger, which will still cause the problem of high temperature rise when water is cut off. Utility Model Content

[0005] The main purpose of the utility model is to provide a combustion chamber shell, aiming at reducing the water-off temperature rise of a gas water heater.

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

[0007] A frame, whose inner cavity forms a combustion chamber, and the frame is provided with a mounting plate above the combustion chamber for connecting with a heat exchanger;

[0008] a heat insulating layer, disposed on the inner wall surface of the frame body and at least disposed on the mounting plate for separating the mounting plate from the fin group of the heat exchanger; and

[0009] A fixing frame, arranged on a side of the heat insulation layer away from the mounting plate, and fixedly connected to the frame to limit the heat insulation layer;

[0010] Wherein, the fixing frame is arranged to avoid air at the position corresponding to the fin group.

[0011] In one embodiment of the present application, the fixing frame covers the surface of the heat insulation layer away from the inner wall of the frame, and the position of the fixing frame corresponding to the fin group is hollowed out.

[0012] In one embodiment of the present application, the fixing frame is provided with through holes at positions corresponding to the fin groups to form hollowing.

[0013] In one embodiment of the present application, the through hole is a rectangular hole; the through hole is extended along the width direction of the mounting plate.

[0014] In an embodiment of the present application, the heat insulation layer at least partially surrounds the combustion chamber;

[0015] The fixing frame includes:

[0016] A plate body, covering the side of the heat insulation layer facing away from the inner wall surface of the frame body, and the plate body is provided with a hollow opening corresponding to the position of the fin group; and

[0017] A flange, provided at the edge of the plate body, one end of the flange is connected to the plate body, and the other end extends towards the inner wall surface of the frame body to limit the edge of the heat insulation layer.

[0018] In an embodiment of the present application, the flange surrounds the peripheral edge of the plate body; wherein, the flange located on the upper edge of the plate body is connected to the mounting plate.

[0019] In an embodiment of the present application, the fixing frame further includes a plurality of fixing lugs, the fixing lugs are provided on the side of the flange facing away from the plate body, and the fixing lugs are fixedly connected to the frame body;

[0020] The fixing lug protrudes towards the frame body relative to the flange, so that there is a gap between the flange and the frame body.

[0021] In an embodiment of the present application, the heat insulation layer is a flexible heat insulation cotton;

[0022] The flexible heat insulation cotton is silicate fiber or silica fiber or glass fiber.

[0023] To achieve the above object, the present application further provides a gas water heater, including a burner, a heat exchanger, and the above-mentioned combustion chamber housing, the heat exchanger is arranged above the combustion chamber housing, and the burner is arranged below the combustion chamber housing;

[0024] The heat insulation layer is located between the fin group of the heat exchanger and the mounting plate, and the fixing frame is arranged with clearance corresponding to the position of the fin group.

[0025] In an embodiment of the present application, there is a gap D in the height direction between the lower surface of the heat insulation layer and the combustion surface of the burner, satisfying: 8mm ≤ D ≤ 12mm.

[0026] In the combustion chamber shell of the utility model technical solution, a heat insulation layer is arranged on the inner wall surface of the frame, so that when the gas water heater is working normally, the heat insulation layer can block the heat in the combustion chamber from being transferred to the frame, reduce the surface temperature of the frame, and reduce the heat storage of the frame; the frame is provided with a mounting plate for connecting with the heat exchanger above the combustion chamber, and the heat insulation layer is at least arranged on the mounting plate to separate the mounting plate and the heat exchanger, so that when the gas water heater stops discharging water, the heat insulation layer can block the heat on the mounting plate from being transferred to the fin group of the heat exchanger, so that there will not be too much heat to heat the stagnant water, thereby effectively improving the temperature rise when the water is stopped. A fixing frame is arranged on the side of the heat insulation layer away from the mounting plate, and the fixing frame is fixedly connected to the frame, so that the limiting function of the heat insulation layer can be realized, and the installation reliability of the heat insulation cotton can be ensured. At the same time, by avoiding the air by setting the fixed frame corresponding to the position of the fin group of the heat exchanger, the fixed frame does not contact the fin group of the heat exchanger, so that the heat of the fixed frame will not be transferred to the heat exchanger, thereby avoiding excessive heat in the heat exchanger and effectively improving the temperature rise when the water is shut off. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 This is a schematic structural diagram of an embodiment of a combustion chamber casing of the utility model;

[0029] Figure 2 for Figure 1 A longitudinal cross-sectional view of an embodiment;

[0030] Figure 3 for Figure 2 A partial enlarged view of the M in the middle;

[0031] Figure 4 for Figure 2 A local enlarged view of the N position in the middle;

[0032] Figure 5 This is a schematic diagram of the matching structure of the bottom frame, the heat insulation layer and the fixing frame in the embodiment of the utility model;

[0033] Figure 6 for Figure 5 An exploded schematic diagram of an embodiment;

[0034] Figure 7 This is a schematic diagram of the matching structure of the cover plate, the heat insulation layer and the fixing frame in the embodiment of the utility model;

[0035] Figure 8 For Figure 7 Explosion schematic diagram of the embodiment;

[0036] Figure 9 Structural schematic diagram of the fixing bracket in the utility model embodiment;

[0037] Figure 10 For Figure 9 Side view of the embodiment;

[0038] Figure 11 Partial schematic diagram of the gas water heater of the present utility model;

[0039] Figure 12 For Figure 11 Structural schematic diagram when the cover plate of the embodiment in [the relevant context] is opened.

[0040] Explanation of the attached drawing reference numerals:

[0041]

[0042]

[0043] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0045] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0046] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes the scenario of A, or the scenario of B, or the scenario where A and B are satisfied simultaneously.

[0047] In addition, if the descriptions such as "first" and "second" are involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0048] A gas water heater is a device that burns gas and produces hot water through heat exchange in a heat exchanger. The gas burns in the combustion chamber, and the temperature of the shell of the combustion chamber is relatively high. To prevent the high-temperature heat energy of the combustion chamber from being transferred outward and damaging other components of the gas water heater, it is necessary to cool down the shell of the combustion chamber. At the same time, when the user turns off the water during the water use process, the water in the heat exchanger does not flow. The heat accumulated in the shell of the combustion chamber and the fins of the heat exchanger due to heat conduction will be conducted into the non-flowing water in the heat exchanger, resulting in an increase in the water temperature in the heat exchanger. When the user turns on the water again, the abnormally heated water in the heat exchanger flows through the water pipe to the user's water use location, making the user feel a burning sensation, that is, the problem of water temperature rise during shutdown.

[0049] In the related art, a heat insulation layer is provided on the inner wall of the shell of the combustion chamber for heat insulation and cooling, and the heat insulation layer is fixed by fixing parts on the inner side. However, the contact between the fixing parts and the heat exchanger will cause too much heat of the fixing parts to be transferred to the heat exchanger, still resulting in a relatively high problem of water temperature rise during shutdown.

[0050] For this reason, the present utility model proposes a combustion chamber shell, aiming to avoid the space at the position of the fixing frame 2 corresponding to the heat exchanger 4, so that the fixing frame 2 does not contact the fin group of the heat exchanger 4, which can reduce the heat transferred from the fixing frame 2 to the heat exchanger 4 and effectively improve the problem of water temperature rise during shutdown. It can be understood that, as Figure 11 and Figure 12 , the gas water heater includes a combustion chamber shell, a heat exchanger 4, a burner 5 and a blower. A combustion chamber that penetrates up and down is formed inside the combustion chamber shell. The heat exchanger 4 is arranged above the combustion chamber shell, and the burner 5 is located below the combustion chamber shell. The burner 5 plays the role of ignition and combustion. The combustion chamber provides a combustion space for the combustion of gas and air. After the gas and air are mixed and burned, the high-temperature flue gas generated flows upward to the heat exchanger 4 to heat the device to be heated (such as a water pipe) in the heat exchanger 4. The blower is used to drive gas and air into the combustion chamber for combustion and transport the high-temperature flue gas after combustion to the heat exchanger 4 for heat exchange, and then discharge the waste gas after heat exchange. The structure of this combustion chamber shell will be described below by way of embodiments.

[0051] like Figures 1 to 4 As shown, the combustion chamber shell includes a frame 1, a heat insulating layer 3 and a fixing frame 2; a combustion chamber is formed in the inner cavity of the frame 1, and a mounting plate 13 for connecting to a heat exchanger 4 is provided above the combustion chamber of the frame 1; the heat insulating layer 3 is provided on the inner wall surface of the frame 1, and is at least provided on the mounting plate 13 to separate the mounting plate 13 from the fin group of the heat exchanger 4; the fixing frame 2 is provided on the side of the heat insulating layer 3 away from the mounting plate 13, and is fixedly connected to the frame 1 to limit the heat insulating layer 3; wherein the fixing frame 2 is arranged to avoid air at the position corresponding to the fin group.

[0052] The inner cavity of the frame 1 forms a combustion chamber. By setting a heat insulation layer 3 on the inner wall surface of the frame 1, the heat insulation layer 3 can play a role in isolating the high-temperature flue gas from the frame 1, preventing the heat in the combustion chamber from being transferred to the frame 1, and achieving the purpose of reducing the surface temperature of the frame 1. The frame 1 is provided with a mounting plate 13 for connecting with the heat exchanger 4 above the combustion chamber. Optionally, the frame 1 has two mounting plates 13 arranged oppositely above the combustion chamber, and a mounting port for mounting the heat exchanger 4 is formed between the two mounting plates 13. When the heat exchanger 4 is installed in the mounting port, the two mounting plates 13 are respectively located on opposite sides of the fin group of the heat exchanger 4. The heat insulation layer 3 is at least provided on the mounting plate 13 to separate the mounting plate 13 from the fin group of the heat exchanger 4, preventing the heat of the mounting plate 13 from being transferred to the fin group of the heat exchanger 4, so that there will not be too much heat to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water supply is stopped.

[0053] By arranging a fixing frame 2 on the side of the thermal insulation layer 3 facing away from the mounting plate 13, the fixing frame 2 is fixedly connected to the frame 1, so as to realize the limiting function of the thermal insulation layer 3, prevent the thermal insulation layer 3 from colliding or falling and breaking and falling off during transportation or handling, thereby ensuring the installation reliability of the thermal insulation layer 3.

[0054] It should be noted that, in the wall thickness direction of the combustion chamber shell, the fixing frame 2 is located on the side of the insulation layer 3 close to the combustion chamber, that is, the high-temperature flue gas in the combustion chamber can easily heat up the fixing frame 2, so that the fixing frame 2 itself will also accumulate a certain amount of heat. Based on this, in this embodiment, the fixing frame 2 is arranged to avoid the position of the fin group of the heat exchanger 4 so that the fixing frame 2 does not contact the fin group of the heat exchanger 4, so that the heat of the fixing frame 2 will not be directly transferred to the heat exchanger 4, thereby avoiding the situation where the heat of the heat exchanger 4 is too high and the temperature rise when the water is stopped increases.

[0055] The fixing bracket 2 is arranged with clearance corresponding to the fin group of the heat exchanger 4. It can be understood that the position of the fixing bracket 2 corresponding to the fin group of the heat exchanger 4 can be hollowed out, or there can be a gap between the fixing bracket 2 and the fin group of the heat exchanger 4, or the fixing bracket 2 can be located at other positions outside the fin group of the heat exchanger 4, etc. As long as the fixing bracket 2 and the fin group of the heat exchanger 4 can be prevented from contacting each other.

[0056] The specific structure of the fixing bracket 2 can be determined according to the actual situation. For example, it can be a plate-like structure, a block-like structure, a strip-like structure or other types of structures. As long as the fixing bracket 2 can fix the heat insulation layer 3 on the inner wall surface of the frame body 1. Optionally, the fixing bracket 2 and the frame body 1 can be fixed by screwing, welding, clamping or other fixing methods.

[0057] In actual application, the mounting plate 13 can be an integral structure with the frame body 1 or a split structure. In this embodiment, considering the convenience of the forming process, it is preferred that the mounting plate 13 is a part of the frame body 1 and can be integrally formed by bending a sheet metal part, which simplifies the forming process and improves the production efficiency.

[0058] It can be understood that the specific structure of the heat insulation layer 3 can also be determined according to the actual situation. For example, it can be a heat insulation board, flexible heat insulation cotton or other heat insulation structures. For better heat insulation effect, the heat insulation layer 3 in this embodiment is flexible heat insulation cotton. The flexible heat insulation cotton has the characteristics of flexibility and heat insulation. Compared with the method of using a rigid heat insulation board for heat insulation in the related art, the flexible heat insulation cotton in this embodiment has a lower density. The flexible heat insulation cotton is a porous medium and has static air gaps inside. Then, under the same volume, the heat insulation ability of this flexible heat insulation cotton is better, and the mass is lower and the heat storage capacity is also lower. Then it can reduce the overall heat storage capacity of the combustion chamber housing and reduce the heat transferred to the heat exchanger 4, effectively improving the temperature rise during shutdown. In addition, the flexible and fluffy characteristics of the flexible heat insulation cotton, such as flexibility and cottoniness, can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need to additionally set up a shock absorption structure. The specific material of the flexible heat insulation cotton can also be determined according to the actual situation. For example, it can be glass fiber heat insulation cotton, mineral wool heat insulation cotton, polyester heat insulation cotton, ceramic fiber heat insulation cotton, silicate heat insulation cotton, silica heat insulation cotton or heat insulation cotton of other materials, as long as it can play a role in fire prevention and heat insulation.

[0059] In summary, in the combustion chamber housing of the technical solution of the present utility model, by providing a heat insulation layer 3 on the inner wall surface of the frame body 1, when the gas water heater is discharging water normally, the heat insulation layer 3 can block the heat transfer in the combustion chamber to the frame body 1, reduce the surface temperature of the frame body 1, and reduce the heat storage capacity of the frame body 1; the frame body 1 is provided with a mounting plate 13 for connecting with the heat exchanger 4 above the combustion chamber, and the heat insulation layer 3 is at least provided on the mounting plate 13 to separate the mounting plate 13 from the heat exchanger 4, so that when the gas water heater stops discharging water, the heat insulation layer 3 can block the heat transfer on the mounting plate 13 to the fin group of the heat exchanger 4, and there will be no excessive heat to heat the stagnant water. Thus, the temperature rise during shutdown can be effectively improved. A fixing frame 2 is provided on the side of the heat insulation layer 3 facing away from the mounting plate 13. By fixedly connecting the fixing frame 2 with the frame body 1, the limiting function of the heat insulation layer 3 can be realized, and the installation reliability of the heat insulation cotton can be ensured. At the same time, by avoiding the space corresponding to the fin group of the heat exchanger 4 on the fixing frame 2, the fixing frame 2 does not contact the fin group of the heat exchanger 4, so that the heat of the fixing frame 2 will not be transferred to the heat exchanger 4. Thus, the excessive heat of the heat exchanger 4 can be avoided, and the temperature rise during shutdown can be effectively improved.

[0060] In an embodiment of the present application, as Figures 5 to 8 , the fixing frame 2 covers the surface of the heat insulation layer 3 facing away from the inner wall surface of the frame body 1, and the position of the fixing frame 2 corresponding to the fin group is hollowed out.

[0061] It can be understood that the heat insulation layer 3 may not only be broken and fall off during collision or dropping, but also may have slag falling phenomenon after long-term use of the gas water heater, which may block the flue. Based on this, in this embodiment, by covering the surface of the heat insulation layer 3 facing away from the inner wall surface of the frame body 1 with the fixing frame 2, the limiting area of the heat insulation layer 3 is increased. On the one hand, the assembly reliability of the heat insulation layer 3 during transportation or handling can be improved to prevent breakage and falling off, and on the other hand, if the heat insulation layer 3 has slag falling after long-term use of the gas water heater, the slag can also be prevented from falling. Thus, compared with the method of limiting the heat insulation layer 3 by using screws or a net structure in the related art, this embodiment can further improve the structural reliability of the heat insulation layer 3 and achieve a better limiting effect.

[0062] Based on the above structure, the temperature of the fixing frame 2 during combustion may be as high as above 300°C, and the fixing frame 2 will accumulate a certain amount of heat. By hollowing out the position of the fixing frame 2 corresponding to the fin group, the fixing frame 2 does not contact the fin group, reducing the contact area between the fixing frame 2 and the heat exchanger 4 and the heat exchange area between the fixing frame 2 and the heat exchanger 4, and allowing the heat insulation layer 3 to directly contact the fin group of the heat exchanger 4, avoiding the heat of the fixing frame 2 being directly transferred to the heat exchanger 4 after the water supply stops, resulting in a higher temperature rise during shutdown.

[0063] In practical applications, the hollowing of the fixing frame 2 can be achieved by providing a through hole 201, a notch, etc. In this embodiment, considering the structural reliability of the fixing frame 2, the fixing frame 2 is provided with a through hole 201 at the position corresponding to the fin group to form a hollowing, so that the fixing frame 2 can still have a limiting effect on the thermal insulation layer 3 at the position above the through hole 201, thereby improving the assembly reliability of the fixing frame 2 and the thermal insulation layer 3.

[0064] Optionally, the through hole 201 is a rectangular hole. By setting the through hole 201 as a rectangular hole, compared with other shapes such as a circle, a bar, etc., the opening area of ​​the through hole 201 can be increased, the contact area between the fixing frame 2 and the heat exchanger 4 can be reduced, and the heat transfer between the fixing frame 2 and the heat exchanger 4 can be further reduced.

[0065] In one embodiment, if Figures 5 to 8 The through hole 201 is extended along the width direction of the mounting plate 13 .

[0066] It can be understood that the width direction of the mounting plate 13 is the extension direction of the heat exchange tube in the heat exchanger 4, wherein the fin group is distributed along the length direction of the heat exchange tube. By extending the through hole 201 along the width direction of the mounting plate 13, the extension direction of the through hole 201 is consistent with the distribution direction of the fin group, thereby avoiding contact between the fixing frame 2 and the fin group, and preventing the heat of the fixing frame 2 from being transferred to the fin group.

[0067] In one embodiment of the present application, Figures 5 to 8 The heat insulation layer 3 is at least partially arranged around the combustion chamber.

[0068] In this embodiment, by at least partially surrounding the combustion chamber, the heat insulation layer 3 can be effectively isolated from the high temperature heat inside the combustion chamber and transferred to the frame 1, so as to achieve the purpose of reducing the surface temperature of the frame 1.

[0069] In practical applications, the heat insulating layer 3 may be adapted to the shape of the inner wall surface of the frame 1, or may only be adapted to the shape around the combustion chamber, or may be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulating layer 3 is at least partially arranged around the combustion chamber. It can be understood that the heat insulating layer 3 is arranged around a partial area around the combustion chamber, or the heat insulating layer 3 completely surrounds the combustion chamber.

[0070] Furthermore, the fixing frame 2 covers the portion of the heat insulation layer 3 corresponding to the combustion chamber to ensure a better limiting effect. Figures 5 to 10 The fixing frame 2 includes a plate body 21 and a flange 22. The plate body 21 is covered on the side of the heat insulation layer 3 away from the inner wall surface of the frame body 1, and the plate body 21 is hollowed out at the position corresponding to the fin group; the flange 22 is arranged at the edge of the plate body 21, one end of the flange 22 is connected to the plate body 21, and the other end extends toward the inner wall surface of the frame body 1 to limit the edge of the heat insulation layer 3.

[0071] In this embodiment, the structure of the fixing frame 2 is exemplified. The plate body 21 functions to limit the surface of the heat insulation layer 3, and the flanging 22 functions to limit the edge of the heat insulation layer 3. By simultaneously providing the plate body 21 and the flanging 22, the function of limiting both the surface and the edge of the heat insulation layer 3 is achieved, and a better limiting and assembling effect on the heat insulation layer 3 is obtained.

[0072] It can be understood that the flanging 22 extends from the plate body 21 towards the inner wall surface of the frame body 1. Then, an installation cavity for installing the heat insulation layer 3 is formed by enclosing between the flanging 22, the plate body 21, and the inner wall surface of the frame body 1, which can prevent the heat insulation layer 3 from bulging during combustion, resulting in a change in the volume of the combustion inner cavity. Specifically, if the heat insulation layer 3 expands inward, it may cause the flame to directly burn the heat insulation layer 3, resulting in over-temperature of the wall surface; and when the flame contacts the heat insulation layer 3, the combustion will be incomplete, resulting in excessive flue gas; the change in the volume of the combustion chamber will also cause an increase in the volumetric heat intensity of the combustion system, triggering combustion resonance.

[0073] Furthermore, as Figures 5 to 8 , the flanging 22 surrounds the peripheral edge of the plate body 21; among them, the flanging 22 located on the upper edge of the plate body 21 is connected to the mounting plate 13.

[0074] With such a setting, the wrapping surface of the fixing frame 2 on the heat insulation layer 3 can be increased, achieving a better effect of preventing slag from falling during combustion. Specifically, the plate body 21 has an upper edge, a lower edge, and a plurality of side edges provided between the upper edge and the lower edge. Correspondingly, flangings 22 are provided on the upper edge, the lower edge, and the side edges.

[0075] Furthermore, as Figures 5 to 8 , the fixing frame 2 further includes a plurality of fixing lugs 23. The fixing lugs 23 are provided on the side of the flanging 22 facing away from the plate body 21, and the fixing lugs 23 are fixedly connected to the frame body 1.

[0076] In this embodiment, the fixing frame 2 is fixedly assembled with the frame body 1 by fixedly connecting the fixing lugs 23 provided on the flanging 22 to the frame body 1. Such a design can avoid drilling assembly holes on the plate body 21 and the heat insulation layer 3, further ensuring the wrapping effect of the plate body 21 on the heat insulation layer 3 and preventing slag leakage.

[0077] Optionally, the fixing lug 23 can be formed by folding the side of the flanging 22 facing away from the plate body 21, or the fixing lug 23 can also be fixedly installed on the flanging 22 by fixing methods such as welding and clamping. In this embodiment, considering the cost and the difficulty of forming, the fixing lug 23 is formed by folding the side of the flanging 22 facing away from the plate body 21. Optionally, the fixing lug 23 is perpendicularly connected to the flanging 22 to enhance the structural strength of the fixing frame 2 by using the right-angle structure.

[0078] Optionally, the fixing lug 23 can be fixed to the housing 1 by screwing or welding.

[0079] Furthermore, as Figure 3 , Figure 4 and Figure 10 , the fixing lug 23 protrudes towards the housing 1 relative to the flange 22, so that there is a gap between the flange 22 and the housing 1.

[0080] In this embodiment, by protruding the fixing lug 23 towards the housing 1 relative to the flange 22, there is a gap between the flange 22 and the housing 1. Thus, except for the contact between the fixing lug 23 where the fixing bracket 2 is fixedly engaged with the housing 1 and the housing 1, other parts of the fixing bracket 2 do not contact the housing 1. Therefore, the contact area between the fixing bracket 2 and the housing 1 can be reduced, the heat transfer area can be reduced, and the excessive heat of the combustion chamber fixing bracket can be prevented from being transferred to the housing 1, resulting in too high a temperature rise of the stop water.

[0081] As an example, the flange 22 can be retracted 2 mm to 4 mm relative to the corresponding fixing lug 23.

[0082] In actual application, the number of fixing lugs 23 can be determined according to actual conditions. For example, one fixing lug 23 can be provided on each flange 22, or one fixing lug 23 can be provided on some flanges 22, and two or more fixing lugs 23 can be provided on some flanges 22, etc. When two or more fixing lugs 23 are provided on a flange 22, the two or more fixing lugs 23 can be spaced along the length direction of the flange 22, so that the force at this flange 22 is more balanced and the installation reliability of the fixing bracket is ensured. As an example, two fixing lugs 23 are respectively provided on the flanges 22 at the upper and lower edges of the plate body 21, and the two fixing lugs 23 are spaced transversely; one fixing lug 23 is provided on the flange 22 at the side edge of the plate body 21, and the fixing lug 23 is located at the middle position in the vertical direction.

[0083] In an embodiment of the present application, the heat insulation layer 3 can be made of flexible heat insulation cotton of silicate fiber or silica fiber or glass fiber. As an example, the flexible heat insulation cotton is made of aluminum silicate fiber cotton with a lower density. The density of the aluminum silicate cotton is less than 0.2 g / cm3, and its density is much less than the density of conventional rigid heat insulation materials such as aluminum silicate plate, which is 0.36 g / cm3. Thus, in the same volume, this embodiment can greatly reduce the heat storage capacity and effectively reduce the temperature rise of the stop water. Preferably, the density of the flexible heat insulation cotton is 0.128 g / cm3 to achieve a better effect of reducing the heat storage capacity.

[0084] In an embodiment of the present application, as Figure 1 , Figure 5 and Figure 7, the frame 1 includes a bottom frame 11 and a cover plate 12. The bottom frame 11 includes a back plate 111 and two side plates 112 disposed on opposite sides of the back plate 111. The back plate 111 and the two side plates 112 enclose a cavity with one side open. An installation plate 13 is provided at the upper edge of the back plate 111; the cover plate 12 is covered on the open side and connected to the two side plates 112 to enclose a combustion chamber with upper and lower openings with the bottom frame 11; the cover plate 12 extends upward to form another installation plate 13.

[0085] Wherein, the two installation plates 13 are respectively disposed on opposite sides of the fin group of the heat exchanger 4. The bottom frame 11 and the cover plate 12 are respectively provided with fixing frames 2 to fix the corresponding heat insulation layers 3. The two fixing frames 2 are both provided with hollow openings at the positions corresponding to the fin group.

[0086] In this embodiment, the upper and lower sides of the bottom frame 11 are open for connecting the heat exchanger 4 and the burner 5 respectively. Specifically, the bottom frame 11 includes a back plate 111 and two side plates 112 disposed on opposite sides of the back plate 111. The connection of the two side plates 112 and the back plate 111 makes the cross-sectional shape of the bottom frame 11 generally present an "L" shape. By covering the cover plate 12 at the open side, the "L" shaped structure is roughly changed into a cross-sectional shape of a "square", thus forming a combustion chamber with upper and lower openings and closed on all sides. An installation plate 13 is provided at the upper edge of the back plate 111, and the cover plate 12 extends upward to form another installation plate 13. The two end plates of the heat exchanger 4 are respectively connected and fixed to the upper edges of the two side plates 112 and the side edges of the two installation plates 13. The fin group is clamped between the two installation plates 13. On this basis, the two fixing frames 2 are both provided with hollow openings at the positions corresponding to the fin group, so that the two fixing frames 2 will not transfer heat to the fin group, thereby further reducing heat transfer and reducing the temperature rise of the stop water temperature.

[0087] In actual application, the bottom frame 11 can directly adopt a sheet metal plate to be integrally bent into an "L" shaped structure, simplifying the manufacturing process and improving 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 4 can be fixed to the two installation plates 13 and the corresponding side plates 112 by screwing, riveting or clamping the end plates, etc.

[0088] The present utility model also proposes a gas water heater, such as Figure 11 and Figure 12, the gas water heater includes a burner 5, a heat exchanger 4, and a combustion chamber housing. The specific structure of the combustion chamber housing refers to the above embodiments. Since this gas water heater adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one. Among them, the heat exchanger 4 is arranged above the combustion chamber housing, and the burner 5 is arranged below the combustion chamber housing; the heat insulation layer 3 is located between the fin group of the heat exchanger 4 and the mounting plate 13, and the fixing frame 2 is arranged with clearance corresponding to the position of the fin group.

[0089] It can be understood that the type of this gas water heater can be a strong exhaust type water heater. At this time, the blower is arranged above the heat exchanger 4, and the air flow is driven by negative pressure suction; or it can also be a forced draft type water heater. At this time, the blower is arranged below the burner 5, and the air flow is driven by blowing air.

[0090] In an embodiment of the present application, as Figure 12 , there is a gap D between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 in the height direction, satisfying: 8mm ≤ D ≤ 12mm.

[0091] It can be understood that the combustion surface of the burner 5 is the fire hole surface of the burner 5. Gas and air are ignited at the combustion surface of the burner 5, and the high-temperature flue gas generated by combustion flows upward under the action of the blower. Therefore, the heat at the area near the combustion surface of the burner 5 is not high, and the heat transferred to the frame 1 in this area is not high either. Thus, the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 can be spaced apart, that is, the frame 1 does not cover the heat insulation layer 3 in a section of the area near the combustion surface of the burner 5. Therefore, on the premise of having little impact on the heat storage amount of the frame 1 here, on the one hand, the material cost of the heat insulation layer 3 can be saved, and on the other hand, the material area of the fixing frame 2 cooperating with the heat insulation layer 3 can be reduced (the fixing frame 2 covers the heat insulation layer 3 and wraps the bottom of the heat insulation layer 3 to prevent the heat insulation layer 3 from easily falling directly into the combustion chamber after burning and deforming), avoiding the situation that the fixing frame 2 stores too much heat, resulting in too high a stop water temperature rise or too much heat transferred to the frame 1.

[0092] In actual application, the gap D in the height direction between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 should neither be too large nor too small. If it is too small, not only will the consumption of the heat insulation layer 3 and the fixing frame 2 increase, but also the fixing frame 2 will easily accumulate too much heat, resulting in too much heat transfer to the frame 1 and causing the problem of too high a temperature rise of the stopped water. If it is too large, the high-temperature flue gas with a higher temperature is likely to directly contact the frame 1, causing the problem of over-temperature of the wall surface of the frame 1 or a relatively high temperature rise of the stopped water. Based on this, in this embodiment, the gap D in the height direction between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 is set to satisfy: 8 mm ≤ D ≤ 12 mm. In this way, both the material cost of the heat insulation layer 3 and the fixing frame 2 can be reduced, and the temperature rise of the stopped water can be lowered.

[0093] Optionally, the gap D in the height direction between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 can be selected as 8 mm, 8.5 mm, 9 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm or 12 mm, etc.

[0094] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, whose inner cavity forms a combustion chamber, and the frame is provided with a mounting plate above the combustion chamber for connecting with a heat exchanger; a heat insulating layer, disposed on the inner wall surface of the frame body and at least disposed on the mounting plate for separating the mounting plate from the fin group of the heat exchanger; and A fixing frame, arranged on a side of the heat insulation layer away from the mounting plate, and fixedly connected to the frame to limit the heat insulation layer; Wherein, the fixing frame is arranged to avoid air at the position corresponding to the fin group.

2. The combustion chamber housing according to claim 1, characterized in that The fixing frame covers the surface of the heat insulation layer away from the inner wall of the frame, and the position of the fixing frame corresponding to the fin group is hollowed out.

3. The combustion chamber housing according to claim 2, characterized in that The fixing frame is provided with through holes at positions corresponding to the fin groups to form hollowing.

4. The combustion chamber housing according to claim 3, characterized in that The through hole is a rectangular hole; the through hole is extended along the width direction of the mounting plate.

5. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The heat insulation layer is at least partially disposed around the combustion chamber; The fixing frame comprises: A plate body is provided to cover the side of the heat insulation layer away from the inner wall of the frame, and the plate body is hollowed out at a position corresponding to the fin group; and A flange is arranged at the edge of the plate body, one end of the flange is connected to the plate body, and the other end extends toward the inner wall surface of the frame body to limit the edge of the heat insulation layer.

6. The combustion chamber housing according to claim 5, characterized in that The flange is arranged around the peripheral edge of the plate body; wherein the flange located at the upper edge of the plate body is connected to the mounting plate.

7. The combustion chamber housing according to claim 5, characterized in that The fixing frame further comprises a plurality of fixing lugs, wherein the fixing lugs are arranged on a side of the flange away from the plate body, and the fixing lugs are fixedly connected to the frame body; The fixing lug is arranged to protrude toward the frame relative to the flange, so that a gap exists between the flange and the frame.

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

9. A gas water heater, characterized in that: It comprises a burner, a heat exchanger and a combustion chamber shell according to any one of claims 1 to 8, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell; The heat insulation layer is located between the fin group of the heat exchanger and the mounting plate, and the fixing frame is arranged to avoid air in a position corresponding to the fin group.

10. The gas water heater according to claim 9, characterized in that: There is a gap D between the lower surface of the heat insulation layer and the combustion surface of the burner in the height direction, which satisfies: 8mm≤D≤12mm.

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