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, and a combustion chamber is formed in an inner cavity of the frame body; the heat insulation layer is arranged on the inner wall face of the frame body and at least partially surrounds the combustion chamber. The fixing frame is arranged on the side, away from the inner wall face of the frame body, of the heat-insulating layer and at least covers the area, corresponding to the combustion chamber, of the The fixing frame is fixedly connected with the frame body to limit the heat insulation layer. According to the technical scheme, the surface temperature of the combustion chamber shell can be reduced, meanwhile, the reliability of the heat insulation layer is improved, and slag falling is prevented.

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. However, when the equipment is hit or dropped during transportation or handling, the heat insulation layer is easily damaged or falls off, resulting in poor reliability. Utility Model Content

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

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

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

[0008] a heat-insulating layer, disposed on the inner wall surface of the frame body and at least partially surrounding the combustion chamber; and

[0009] The fixing frame is arranged on a side of the heat insulation layer away from the inner wall of the frame and at least covers the area of ​​the heat insulation layer corresponding to the combustion chamber; the fixing frame is fixedly connected to the frame to limit the heat insulation layer.

[0010] In one embodiment of the present application, the fixing frame includes:

[0011] A plate body is provided to cover the surface of the heat insulation layer away from the inner wall of the frame; and

[0012] 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.

[0013] In one embodiment of the present application, at least one fixing lug is provided on a side of the flange facing away from the plate body, and the fixing lug is fixedly connected to the frame body;

[0014] The fixed lug protrudes towards the housing relative to the flanging, so that there is a gap between the flanging and the housing.

[0015] In an embodiment of the present application, the fixed lug is fixed to the housing by screwing or welding;

[0016] And / or, the plate body is provided with a plurality of reinforcing ribs; the plurality of reinforcing ribs are arranged in a vertical and horizontal cross pattern.

[0017] In an embodiment of the present application, the peripheral edge of the plate body is provided with the flanging, and the flanging is used to wrap the peripheral edge of the heat insulation layer.

[0018] In an embodiment of the present application, the fixing frame at least wraps the bottom edge of the heat insulation layer.

[0019] In an embodiment of the present application, the housing has two mounting plates located above the combustion chamber, and the two mounting plates are arranged oppositely for connecting with a heat exchanger;

[0020] The heat insulation layer extends from the wall surface of the combustion chamber cavity to the mounting plate to separate the mounting plate from the heat exchanger;

[0021] The fixing frame extends from the combustion chamber to the upper edge of the heat insulation layer.

[0022] In an embodiment of the present application, the part of the fixing frame corresponding to the heat exchanger is provided with a hollow-out structure.

[0023] In an embodiment of the present application, the housing includes:

[0024] A bottom frame, including a back plate and two side plates respectively arranged on opposite sides of the back plate, and the back plate and the two side plates enclose a cavity with one side open; and

[0025] A cover plate, covering the open part and connecting with the two side plates to enclose the combustion chamber with upper and lower openings together with the bottom frame;

[0026] The heat insulation layer includes a first heat insulation layer and a second heat insulation layer, the fixing frame includes a first fixing frame and a second fixing frame, the first heat insulation layer is limited to the inner wall surfaces of the back plate and the two side plates through the first fixing frame, and the second heat insulation layer is limited to the inner wall surface of the cover plate through the second fixing frame.

[0027] In an embodiment of the present application, the first heat insulation layer is of an integral structure; and / or, the second heat insulation layer is of an integral structure;

[0028] The first fixing frame is of an integral structure; and / or, the second fixing frame is of an integral structure.

[0029] In one embodiment of the present application, the thermal insulation layer is flexible thermal insulation cotton, and the flexible thermal insulation cotton can swing between the fixing frame and the frame.

[0030] In one embodiment of the present application, the flexible thermal insulation cotton is silicate fiber or silica fiber or glass fiber;

[0031] The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

[0032] To achieve the above object, the present application also provides a gas water heater, comprising a burner, a heat exchanger, a fan and the above combustion chamber shell, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell;

[0033] The fan is arranged above the heat exchanger, or the fan is arranged below the burner;

[0034] The distance between the lower surface of the heat exchanger and the upper surface of the burner is between 80 mm and 110 mm.

[0035] In one 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, which satisfies: 8mm≤D≤12mm.

[0036] 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, and the heat insulation layer is at least arranged around the combustion chamber, 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; therefore, when the gas water heater stops discharging water, the frame with low heat storage will not transfer too much heat to the heat exchanger to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. A fixing frame is arranged on the side of the heat insulation layer away from the inner wall surface of the frame, and the fixing frame is fixedly connected to the frame to realize the limiting function of the heat insulation layer. The fixing frame can at least cover the area of ​​the heat insulation layer corresponding to the combustion chamber, increasing the limiting area of ​​the heat insulation layer. On the one hand, it can improve the assembly reliability of the heat insulation layer during transportation or handling to prevent it from breaking and falling off. On the other hand, it can prevent the heat insulation layer from slagging or falling off during the combustion of the gas water heater, thereby achieving a better effect of improving the structural reliability of the heat insulation layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0038] Figure 1 Structural schematic diagram of an embodiment of the combustion chamber housing of the present invention;

[0039] Figure 2 Cooperative structural schematic diagram of the bottom frame, the first heat insulation layer and the first fixing frame in the embodiment of the present invention;

[0040] Figure 3 For Figure 2 Explosion schematic diagram of the embodiment;

[0041] Figure 4 Structural schematic diagram of the first fixing frame in the embodiment of the present invention;

[0042] Figure 5 Side view of the first fixing frame in the embodiment of the present invention;

[0043] Figure 6 For Figure 2 Longitudinal sectional view of the embodiment;

[0044] Figure 7 For Figure 6 Partial enlarged view at M in;

[0045] Figure 8 For Figure 6 Partial enlarged view at N in;

[0046] Figure 9 Cooperative structural schematic diagram of the cover plate, the second heat insulation layer and the second fixing frame in the embodiment of the present invention;

[0047] Figure 10 For Figure 9 Explosion schematic diagram of the embodiment;

[0048] Figure 11 Partial schematic diagram of the gas water heater of the present invention;

[0049] Figure 12 For Figure 11 Structural schematic diagram when the cover plate of the embodiment in is opened.

[0050] Explanation of the reference numerals in the drawings:

[0051] Label Name Label Name 1 Frame 22 Flange 11 Bottom Frame 23 Fixed Lug 111 Back Panel 2a First Fixing Bracket 112 Side Panel 2b Second Fixing Bracket 113 First Mounting Plate 3 Heat Insulation Layer 12 Cover Plate 3a First Heat Insulation Layer 121 Second Mounting Plate 3b Second Heat Insulation Layer 2 Fixing Bracket 4 Heat Exchanger 21 Plate Body 5 Burner 211 Reinforcing Rib

[0052] The realization, functional features and advantages of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0053] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0054] 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 positional 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.

[0055] At the same time, the meaning of "and / or" or "and / or" that appears throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes the solution of A, or the solution of B, or the solution that A and B are satisfied simultaneously.

[0056] In addition, if there are descriptions such as "first", "second", etc. involved in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. 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 protection scope required by the present utility model.

[0057] A gas water heater is a device that burns gas and produces hot water through heat exchange in a heat exchanger. The gas burns in the combustion chamber, and the temperature of the housing of the combustion chamber is relatively high. To prevent the high-temperature heat energy in the combustion chamber from being transferred outward and damaging other components of the gas water heater, it is necessary to cool down the housing of the combustion chamber. At the same time, when the user turns off the water during the water use process, the water in the heat exchanger does not flow, and the heat accumulated in the housing 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 water abnormally heated 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 when the water is turned off.

[0058] In the related art, an insulation layer is provided on the inner wall of the combustion chamber shell to insulate and cool down, so as to improve the problem of temperature rise when water is cut off. However, when the equipment collides or falls during transportation or handling, the insulation layer is easily damaged or falls off from the combustion chamber shell.

[0059] To this end, the utility model proposes a combustion chamber shell, which is applied to a gas water heater, and is intended to reduce the surface temperature of the combustion chamber shell and the water shut-off temperature rise, while improving the assembly reliability of the heat insulation layer 3. It can be understood that, if Figure 11 and Figure 12 The gas water heater includes a combustion chamber shell, a heat exchanger 4, a burner 5 and a fan. A combustion chamber that passes through from top to bottom 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 a role in ignition and combustion. The combustion chamber provides a combustion space for the combustion of gas and air. The high-temperature flue gas generated after the gas and air are mixed and burned flows upward to the heat exchanger 4 to heat the heated device (such as a water pipe) in the heat exchanger 4. The fan is used to drive the 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 exhaust gas after heat exchange. The structure of the combustion chamber shell is explained in the following by way of an embodiment.

[0060] like Figures 1 to 3 , Figure 9 as well as Figure 10 As shown, the combustion chamber shell includes a frame 1, an insulation layer 3 and a fixing frame 2; a combustion chamber is formed in the inner cavity of the frame 1; the insulation layer 3 is arranged on the inner wall surface of the frame 1, and at least partially surrounds the combustion chamber; the fixing frame 2 is arranged on the side of the insulation layer 3 away from the inner wall surface of the frame 1, and at least covers the area of ​​the insulation layer 3 corresponding to the combustion chamber; the fixing frame 2 is fixedly connected to the frame 1 to limit the insulation layer 3.

[0061] The inner cavity of the frame 1 forms a combustion chamber. By arranging a heat insulating layer 3 on the inner wall surface of the frame 1, the heat insulating layer 3 is arranged around the combustion chamber, which can isolate the high-temperature flue gas from the frame 1, prevent the heat in the combustion chamber from being transferred to the frame 1, and achieve the purpose of reducing the surface temperature of the frame 1. At the same time, the heat insulating layer 3 isolates the heat from being transferred to the frame 1, and the heat storage capacity of the frame 1 is reduced. Therefore, when the user stops using water, the frame 1 with a lower heat storage capacity will not transfer too much heat to the heat exchanger 4 to heat the stagnant water, thereby effectively improving the problem of temperature rise when the water supply is stopped.

[0062] By arranging a fixing frame 2 on the side of the insulation layer 3 facing away from the inner wall surface of the frame 1, the fixing frame 2 can at least cover the area of ​​the insulation layer 3 corresponding to the combustion chamber, so that the fixing frame 2 is fixedly connected to the frame 1, and the limiting function of the insulation layer 3 can be achieved, preventing the insulation layer 3 from colliding or falling and breaking and falling off during transportation or handling.

[0063] It should be noted that in actual application, not only may the heat insulation layer 3 break and fall off during collision or dropping, but also slag may appear and block the flue after the gas water heater has been used for a long time. Based on this, in this embodiment, by covering at least the area of the heat insulation layer 3 corresponding to the combustion chamber 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. On the other hand, if slag appears in the heat insulation layer 3 after the gas water heater has been used for a long time, it can also prevent the slag from falling. Thus, compared with the method of limiting the heat insulation layer 3 by using screws or a mesh 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.

[0064] In actual application, the specific structure of the fixing frame 2 can be determined according to the actual situation. For example, it can be a plate-like structure, a block-like structure or other types of structures, etc. The fixing frame 2 covers at least the part of the heat insulation layer 3 corresponding to the combustion chamber. It can be understood that the fixing frame 2 can only cover the part of the heat insulation layer 3 corresponding to the combustion chamber, or it can also cover other parts of the heat insulation layer 3, such as the parts corresponding to the heat exchanger 4 / flue, etc., or it can also completely wrap the heat insulation layer 3. Optionally, the fixing frame 2 and the frame body 1 can be fixed by screwing, welding, clamping or other fixing methods, etc.

[0065] In actual application, the heat insulation layer 3 can be adapted to the shape of the inner wall surface of the frame body 1, or it can be only adapted to the shape around the combustion chamber, or it can also be other shapes, etc. In this embodiment, for a better heat insulation effect, the heat insulation layer 3 is at least disposed around the combustion chamber. It can be understood that the heat insulation layer 3 is only disposed around the combustion chamber, or in addition to the area around the combustion chamber, the heat insulation layer 3 can also be provided in other parts, such as the heat exchanger 4, the flue, etc.

[0066] It is understandable that the specific structure of the insulation layer 3 can also be determined according to the actual situation, for example, an insulation board, flexible insulation cotton or other insulation structures can be used. For better insulation effect, the insulation layer 3 in this embodiment is flexible insulation cotton, which has the characteristics of flexibility and insulation. Compared with the insulation method of using hard insulation boards in the related art, the density of the flexible insulation cotton in this embodiment is lower, so under the same volume, the mass of the flexible insulation cotton is lower, and the heat storage capacity will also be lower, which can reduce the overall heat storage capacity of the combustion chamber shell and effectively improve the water stop temperature rise. In addition, the flexible insulation cotton's flexible, 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 additional shock-absorbing structures. The specific material of the flexible insulation cotton can also be determined according to the actual situation, for example, it can be glass fiber insulation cotton, mineral wool insulation cotton, polyester insulation cotton, ceramic fiber insulation cotton, silicate insulation cotton, silica insulation cotton or insulation cotton of other materials, as long as it can play a role in fireproofing and heat insulation.

[0067] In summary, in the combustion chamber shell of the technical solution of the utility model, an insulating layer 3 is arranged on the inner wall surface of the frame 1, and the insulating layer 3 is at least arranged around the combustion chamber, so that when the gas water heater is working normally to discharge water, the insulating layer 3 can block the heat in the combustion chamber from being transferred to the frame 1, thereby lowering the surface temperature of the frame 1 and reducing the heat storage capacity of the frame 1; therefore, when the gas water heater stops discharging water, the frame 1 with a lower heat storage capacity will not transfer excessive heat to the heat exchanger 4 to heat the stagnant water, which can effectively improve the temperature rise when the water supply is stopped. A fixing frame 2 is provided on the side of the thermal insulation layer 3 facing away from the inner wall of the frame 1. The fixing frame 2 is fixedly connected to the frame 1, so as to realize the limiting function of the thermal insulation layer 3. The fixing frame 2 can at least cover the area of ​​the thermal insulation layer 3 corresponding to the combustion chamber, thereby increasing the limiting area of ​​the thermal insulation layer 3. On the one hand, it can improve the assembly reliability of the thermal insulation layer 3 during transportation or handling to prevent it from breaking and falling off. On the other hand, it can prevent the thermal insulation layer 3 from slagging or falling off during the combustion process of the gas water heater, thereby achieving the effect of better improving the structural reliability of the thermal insulation layer 3.

[0068] In one embodiment of the present application, Figures 2 to 4 , Figure 9 and Figure 10 The fixing frame 2 includes a plate body 21 and a flange 22. The plate body 21 is covered on the surface of the insulation layer 3 away from the inner wall surface of the frame body 1; 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 insulation layer 3.

[0069] This embodiment illustrates the structure of the fixing frame 2. 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, resulting in a better limiting and assembling effect for the heat insulation layer 3.

[0070] 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 may 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.

[0071] Furthermore, flangings 22 are provided at the peripheral edges of the plate body 21, and the flangings 22 are used to wrap the peripheral edges of the heat insulation cotton.

[0072] 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.

[0073] Furthermore, as shown in Figures 2 to 4 , Figure 9 and Figure 10 , at least one fixing lug 23 is provided on the side of the flanging 22 facing away from the plate body 21, and the fixing lug 23 is fixedly connected to the frame body 1.

[0074] In this embodiment, by fixedly connecting the fixing lug 23 provided on the flanging 22 to the frame body 1, the fixed assembly of the fixing frame 2 and the frame body 1 is realized. Such a design can avoid drilling assembly holes in 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.

[0075] 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.

[0076] Optionally, the fixing lug 23 and the frame body 1 can be fixed by screwing or welding.

[0077] Further, as shown in Figures 5 to 8 , the fixing lug 23 protrudes towards the housing 1 relative to the flanging 22, so that there is a gap between the flanging 22 and the housing 1.

[0078] In this embodiment, by protruding the fixing lug 23 relative to the flanging 22 towards the housing 1, a gap is formed between the flanging 22 and the housing 1. Thus, except for the part where the fixing lug 23 of the fixing bracket 2 is in contact with the housing 1 in the fixed cooperation with the housing 1, other parts of the fixing bracket 2 are not in contact with the housing 1. Thereby, 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.

[0079] As an example, the flanging 22 can be retracted 2 mm to 4 mm relative to the corresponding fixing lug 23.

[0080] In practical applications, the number of fixing lugs 23 can be determined according to the actual situation. For example, one fixing lug 23 can be provided on each flanging 22, or one fixing lug 23 can be provided on some flanging 22, and two or more fixing lugs 23 can be provided on some flanging 22, etc. When two or more fixing lugs 23 are provided on a flanging 22, the two or more fixing lugs 23 can be spaced along the length direction of the flanging 22, so that the force at this flanging 22 is more balanced, ensuring the installation reliability of the fixing bracket. As an example, two fixing lugs 23 are respectively provided on the flangings 22 at the upper edge and the lower edge of the plate body 21, and the two fixing lugs 23 are spaced transversely; one fixing lug 23 is provided on the flanging 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.

[0081] To further improve the heat insulation performance of the heat insulation layer 3, as shown in Figure 4 and Figure 10 , in an embodiment of the present application, the plate body 21 is provided with a plurality of reinforcing ribs 211.

[0082] It can be understood that taking the heat insulation layer 3 as a flexible heat insulation cotton as an example, the flexible heat insulation cotton mainly insulates heat through air balls formed by fibrous materials. Since the thermal conductivity of static air is extremely low and there is no convective heat transfer. When the flexible heat insulation cotton is compressed, the number of air balls decreases and it becomes solid heat transfer, so the heat insulation ability will be greatly reduced. Based on this, in this embodiment, by providing a plurality of reinforcing ribs 211 on the plate body 21, the strength of the plate body 21 is increased, the heat insulation effect of the heat insulation layer 3 can be ensured, and the heat deformation of the plate body 21 during the combustion process can be prevented from squeezing the heat insulation layer 3, resulting in a weakened heat insulation effect and wall surface overheating.

[0083] The shape and structure of multiple reinforcing ribs 211 can be determined according to the actual situation. For example, they can be strip-shaped, circular, or other shapes. In this embodiment, it is preferred that multiple reinforcing ribs 211 are arranged in a vertical and horizontal cross pattern to further enhance the structural strength through a vertical structure.

[0084] Optionally, the reinforcing rib 211 can be a convex rib structure welded to the plate body 21, or it can also be formed by pressing the plate body 21.

[0085] In an embodiment of the present application, the fixing frame 2 wraps at least the bottom edge of the heat insulation layer 3.

[0086] It can be understood that the heat insulation layer 3 may not only break and fall off during a collision or a drop, but also may have slag falling phenomenon after the gas water heater has been used for a long time. Based on this, in this embodiment, by wrapping the fixing frame 2 around at least the bottom edge of the heat insulation layer 3, it is possible to prevent the slag of the heat insulation layer 2 from falling into the combustion chamber and avoid debris from falling onto the combustion surface of the burner 5.

[0087] In an embodiment of the present application, as Figures 1 to 3 , Figure 9 and Figure 10 , the frame body 1 has two mounting plates located above the combustion chamber, and the two mounting plates are arranged opposite to each other for connecting with the heat exchanger 4; the heat insulation layer 3 extends from the cavity wall surface of the combustion chamber to the mounting plates to separate the mounting plates from the heat exchanger 4.

[0088] In this embodiment, the two mounting plates are arranged opposite to each other above the combustion chamber, forming two relatively distributed mounting openings. The two end plates of the heat exchanger 4 are respectively installed at the two mounting openings and are both connected to the two mounting plates to form an enclosed cavity. The fin group and the heat exchange tubes of the heat exchanger 4 are located in the enclosed cavity; the two mounting plates are respectively arranged on the opposite sides of the fin group. The heat insulation layer 3 extends upward from the combustion chamber to the heat exchanger 4. It can be understood that the part where the heat insulation layer 3 extends to the heat exchanger 4 is located between the fin group and the corresponding mounting plate, and is used to block the heat transfer between the fin group and the corresponding mounting plate.

[0089] It can be understood that the two mounting plates are part of the frame body 1, and the heat of the part of the frame body 1 corresponding to the combustion chamber can easily be transferred to the two mounting plates. In this embodiment, by isolating the heat insulation layer 3 between the fin group and the corresponding mounting plate, it is possible to effectively prevent the heat of the mounting plate from being transferred to the fin group and reduce the stop water temperature rise. Further, the heat insulation layer 3 covers the fin group of the heat exchanger 4, making the heat insulation effect between the mounting plate and the fin group better.

[0090] Optionally, the part where the mounting plate and the frame body 1 form the combustion chamber can be integrally formed or assembled separately.

[0091] In an embodiment, as Figures 6 to 8, the plate body 21 extends from the combustion chamber to the upper edge of the heat insulation layer 3, which can increase the overall wrapping property of the fixing bracket 2 around the heat insulation layer 3 and further improve the assembly reliability of the heat insulation layer 3. Specifically, on the basis that the plate body 21 extends to the upper edge of the heat insulation layer 3, the flanging 22 at the upper edge of the plate body 21 can extend towards the corresponding mounting plate, and then is fixedly assembled with the mounting plate through the fixing lug 23 on the flanging 22. It can be understood that the flanging 22 at the upper edge of the plate body 21 can wrap the upper edge of the heat insulation layer 3 and improve the limiting effect on the heat insulation layer 3; at the same time, the flanging 22 will shrink a certain distance relative to the corresponding fixing lug 23, so that the flanging 22 does not contact the corresponding mounting plate, reducing the contact area between the fixing bracket and the mounting plate, and thus reducing the heat transfer between the fixing bracket and the mounting plate.

[0092] It can be understood that flangings 22 are provided at both side edges of the plate body 21 corresponding to the mounting plate, and the flangings 22 can wrap the two side edges of the heat insulation layer 3 to improve the limiting effect on the heat insulation layer 3. In actual application, considering that fixing lugs 23 are provided at both the upper edge and the lower edge of the plate body 21 for fixation, fixing lugs 23 may not be provided at both side edges of the plate body 21 corresponding to the mounting plate, and still have good fixed connection strength. In this way, on the one hand, material costs can be saved, and on the other hand, it will not cause interference during the installation of the end plate of the heat exchanger 4. Further, the flangings 22 at both side edges of the plate body 21 corresponding to the mounting plate are arranged at intervals with the mounting plate to reduce the contact area between the fixing bracket and the mounting plate and reduce the heat exchange area.

[0093] In order to further reduce the temperature rise of the stopped water, in one embodiment, as Figure 2 , Figure 9 and Figure 10 , the part of the plate body 21 corresponding to the heat exchanger 4 is provided with a hollow structure.

[0094] It can be understood that the fixing bracket 2 is located on the side of the heat insulation layer 3 facing the combustion chamber. During combustion, the temperature of the fixing bracket 2 is as high as over 300 °C. If the fixing bracket 2 contacts the heat exchanger 4, the heat of the fixing bracket 2 after the water supply stops will be transferred to the water in the heat exchange tubes through the fin group, resulting in a significant increase in the water temperature. When the water is turned on again, there will be a section of high-temperature water scalding the user. Therefore, in this embodiment, by hollowing out the part of the plate body 21 corresponding to the heat exchanger 4, the contact area between the plate body 21 and the heat exchanger 4 is reduced, and the heat exchange area between the fixing bracket 2 and the heat exchanger 4 is reduced, so that the heat insulation layer 3 is in direct contact with the fin group of the heat exchanger 4, avoiding the direct transfer of the heat of the plate body 21 to the heat exchanger 4 after the water supply stops, resulting in a high temperature rise of the stopped water.

[0095] Specifically, the part of the plate body 21 corresponding to the fin group of the heat exchanger 4 is provided with a hollow structure to avoid direct contact between the plate body 21 and the fin group.

[0096] In one embodiment of the present application, asFigures 1 to 3 , Figure 9 and Figure 10 , the frame body 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; 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.

[0097] The heat insulation layer 3 includes a first heat insulation layer 3a and a second heat insulation layer 3b. The fixing frame 2 includes a first fixing frame 2a and a second fixing frame 2b. The first heat insulation layer 3a is limited to the inner wall surfaces of the back plate 111 and the two side plates 112 through the first fixing frame 2a, and the second heat insulation layer 3b is limited to the inner wall surface of the cover plate 12 through the second fixing frame 2b.

[0098] 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 between the two side plates 112 and the back plate 111 makes the cross-sectional shape of the bottom frame 11 generally present an inverted "C" shape. By covering the cover plate 12 at the open side, the inverted "C" shape structure is roughly changed into a cross-sectional shape presenting a "square" shape, thereby forming a combustion chamber with upper and lower openings and a closed perimeter.

[0099] By setting the frame body 1 as a split structure of the bottom frame 11 and the cover plate 12, it is more convenient to install internal structures such as the heat insulation layer 3 and fixing brackets. Correspondingly, the first heat insulation layer 3a and the second heat insulation layer 3b are split structures to respectively cover the inner wall surfaces of the bottom frame 11 and the cover plate 12; the first fixing frame 2a and the second fixing frame 2b are split structures to respectively limit the first heat insulation layer 3a and the second heat insulation layer 3b. Such a setting makes the assembly more convenient.

[0100] During actual assembly, the first heat insulation layer 3a can be fixed on the inner wall surface of the bottom frame 11 first, and after the second heat insulation layer 3b is fixed on the inner wall surface of the cover plate 12, the cover plate 12 is then installed on the bottom frame 11. In this way, the inner wall surface of the combustion chamber can be surrounded by the heat insulation layer 3 to ensure the heat insulation effect. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, riveting or other fixing methods.

[0101] During actual application, the top wall of the back plate 111 extends upward to form a first mounting plate 113. Correspondingly, the cover plate 12 extends upward from the combustion chamber to form a second mounting plate 121. The first mounting plate 113 and the second mounting plate 121 are arranged opposite to each other to respectively correspond to the installation of the front and rear sides of the fin group of the heat exchanger 4. Among them, the first heat insulation layer 3a and the first fixing frame 2a extend to the first mounting plate 113, and the second heat insulation layer 3b and the second fixing frame 2b extend to the second mounting plate 121.

[0102] Specifically, the first heat insulation layer 3a covers the inner wall surfaces of the back plate 111 and the two side plates 112; the first fixing frame 2a is bent to form three-section fixing segments to respectively press the first heat insulation layer 3a located on the inner wall surfaces of the back plate 111 and the two side plates 112.

[0103] It can be understood that the back plate 111 and the two side plates 112 are respectively connected at an angle, so the back plate 111 and the two side plates 112 are respectively in different planes. Then, the first heat insulation layer 3a covering the inner wall surfaces of the back plate 111 and the two side plates 112 is also respectively in different planes. By bending the first fixing frame 2a to form three-section fixing segments to respectively press the first heat insulation layer 3a located on the inner wall surfaces of the back plate 111 and the two side plates 112, the first heat insulation layer 3a in different planes can be limited, ensuring the structural reliability of the first heat insulation layer 3a.

[0104] In addition, it should be noted that the first fixing frame 2a of this embodiment is an integral structure, so there is no need to separately set fixing segments for different planes, which simplifies the installation structure and improves the assembly efficiency. Optionally, the cross-section of the first fixing frame 2a can be roughly set as a "C" - shaped structure to fit the bottom frame 11 of the "C" - shaped structure. In actual application, the first heat insulation layer 3a can also be set as a "C" - shaped integral structure to match the inner wall surfaces of different plate bodies 21, so that the connection part between two adjacent plate bodies 21 will also be covered by the first heat insulation layer 3a, ensuring the heat insulation ability of the connection part. Optionally, the first fixing frame 2a can be integrally bent from a sheet metal part / stainless steel and other high - temperature - resistant metals.

[0105] In actual application, the second heat insulation layer 3b can also be an integral structure, covering the inner wall surface of the cover plate 12. The second fixing frame 2b can be set as an integral structure, covering the second heat insulation layer 3b. Correspondingly, the part of the plate body 21 of the second fixing frame 2b corresponding to the fin group of the heat exchanger 4 is provided with a hollow, while ensuring the limiting reliability of the second heat insulation layer 3b, reducing the heat transfer between the second fixing frame 2b and the heat exchanger 4, and effectively improving the stop - water temperature rise.

[0106] In an embodiment of the present application, the heat insulation layer 3 can adopt a flexible heat insulation cotton of silicate fiber or silica fiber or glass fiber. As an example, the flexible heat insulation cotton adopts aluminosilicate fiber cotton with a lower density. The density of the aluminosilicate 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 aluminosilicate 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 stop - water temperature rise. 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.

[0107] Furthermore, the flexible heat insulation cotton has a porous structure; the surfaces of the flexible heat insulation cotton in contact with the inner wall surface of the frame body 1 and the plate body 21 are concave-convex, so that there are a plurality of irregular gas micro-channels between the flexible heat insulation cotton and the inner wall surface of the frame body 1, and between the flexible heat insulation cotton and the wall surface of the plate body 21.

[0108] It can be understood that compared with the structure of the cardboard body 21, the density of this flexible heat insulation cotton is lower. Then, under the same volume, the mass of this flexible heat insulation cotton is lower, and thus the heat storage capacity will also be lower. The internal structure of the flexible heat insulation cotton is relatively fluffy and porous, and the surface of the flexible heat insulation cotton is uneven. Then, when the flexible heat insulation cotton is installed on the inner wall surface of the frame body 1, some irregular gas micro-channels will be formed between the flexible heat insulation cotton and the inner wall surface of the frame body 1. On the one hand, these gas micro-channels can play a role in isolating the flexible heat insulation cotton from the frame body 1, and on the other hand, they can play a role in sound absorption and noise reduction. Correspondingly, some irregular gas micro-channels will also be formed between the flexible heat insulation cotton and the inner wall surface of the plate body 21. On the one hand, these gas micro-channels can play a role in isolating the flexible heat insulation cotton from the plate body 21, and on the other hand, they can play a role in sound absorption and noise reduction.

[0109] Optionally, the flexible heat insulation cotton can shake between the fixing frame 2 and the frame body 1, so that the flexible heat insulation cotton can have a deformation space and be compressed when heated and expanded, thereby ensuring the heat insulation strength of the flexible heat insulation cotton and ensuring the heat insulation effect.

[0110] The present utility model also proposes a gas water heater, such as Figure 11 and Figure 12 , this gas water heater includes a burner 5, a heat exchanger 4, a blower and a combustion chamber housing. The specific structure of the combustion chamber housing refers to the above-mentioned embodiments. Since this gas water heater adopts all the technical solutions of the above-mentioned all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one. Among them, the heat exchanger 4 is arranged above the combustion chamber housing, and the burner 5 is arranged below the combustion chamber housing.

[0111] 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.

[0112] Furthermore, the distance between the lower surface of the heat exchanger 4 and the combustion surface of the burner 5 is between 80 mm and 110 mm.

[0113] In this embodiment, the lower surface of the heat exchanger 4 can be understood as the lower end surface of the fins, and the combustion surface of the burner 5 can be understood as the flame hole surface of the burner 5. At this time, the space for flame combustion is between the lower surface of the heat exchanger 4 and the combustion surface of the burner 5. Specifically, in this embodiment, an atmospheric burner 5 with a low flame is adopted, and the distance between the lower surface of the heat exchanger 4 and the combustion surface of the burner 5 can be set between 80 mm and 110 mm. Compared with the distance between the lower surface of the heat exchanger 4 and the upper surface of the burner 5 in a conventional water heater, which needs to be about 150 mm, the height of the flame combustion space in this embodiment is shortened. And at this height, on the one hand, it can prevent the flame from directly burning the fins and causing the fins to deform and shorten their service life, and on the other hand, it can ensure that the flame burns fully in this space.

[0114] In addition, it should be noted that precisely because the height of the flame combustion space is reduced, the height of the overall combustion chamber frame 1 is reduced, and the area and mass of the frame 1 can be reduced. As a result, the heat storage capacity of the entire combustion chamber frame 1 will be reduced, thereby effectively reducing the wall surface overheating and the temperature rise during shutdown.

[0115] And precisely because the heat storage capacity of the frame 1 itself is reduced, compared with the fixing method using screws or strip structures, in the case of the same overall heat storage capacity, in this embodiment, a fixing frame 2 that at least covers the area of the heat insulation layer 3 corresponding to the combustion chamber can be adopted to increase the limiting area of the heat insulation layer 3, further improving the effect of preventing fragmentation, slagging or falling off.

[0116] 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: 8 mm ≤ D ≤ 12 mm.

[0117] It can be understood that the combustion surface of the burner 5 is the flame hole surface of the burner 5. The 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 fan. Therefore, the heat 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 is not covered with the heat insulation layer 3 in a section of the area close to the combustion surface of the burner 5. Thus, on the premise of having little influence on the heat storage capacity 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 temperature rise during shutdown or too much heat transferred to the frame 1.

[0118] In practical applications, 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 usage amounts of the heat insulation layer 3 and the fixing frame 2 increase, but also the fixing frame 2 will easily store too much heat, resulting in excessive 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 relatively high 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.

[0119] 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.

[0120] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the inventive concept of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, the inner cavity of which forms a combustion chamber; A heat insulation layer is provided on the inner wall surface of the frame body and at least partially surrounds the combustion chamber; as well as The fixing frame is arranged on a side of the heat insulation layer away from the inner wall of the frame and at least covers the area of ​​the heat insulation layer corresponding to the combustion chamber; the fixing frame is fixedly connected to the frame to limit the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that The fixing frame comprises: A plate body is provided to cover the surface of the heat insulation layer away from the inner wall of the frame; 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.

3. The combustion chamber housing according to claim 2, characterized in that At least one fixing lug is provided on a side of the flange facing away from the plate body, and the fixing lug is 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.

4. The combustion chamber housing according to claim 3, characterized in that The fixing lug is fixed to the frame by screws or welding; And / or, the plate body is provided with a plurality of reinforcing ribs; the plurality of reinforcing ribs are arranged crosswise in a horizontal and vertical manner.

5. The combustion chamber housing according to any one of claims 2 to 4, characterized in that The peripheral edges of the plate body are all provided with flanges, and the flanges are used to wrap the peripheral edges of the heat insulation layer.

6. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The fixing frame at least wraps the bottom edge of the thermal insulation layer.

7. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The frame has two mounting plates located above the combustion chamber, and the two mounting plates are arranged opposite to each other for connection with the heat exchanger; The heat insulation layer extends from the cavity wall of the combustion chamber to the mounting plate to separate the mounting plate from the heat exchanger; The fixing frame extends from the combustion chamber to an upper edge of the heat insulation layer.

8. The combustion chamber housing according to claim 7, characterized in that The fixing frame is hollowed out at a location corresponding to the heat exchanger.

9. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The frame comprises: A bottom frame, comprising a back plate and two side plates arranged on opposite sides of the back plate, wherein the back plate and the two side plates enclose a cavity with one side open; and A cover plate, which covers the opening and is connected to the two side plates to enclose the bottom frame to form the combustion chamber with upper and lower openings; The thermal insulation layer includes a first thermal insulation layer and a second thermal insulation layer, and the fixing frame includes a first fixing frame and a second fixing frame. The first thermal insulation layer is limited to the inner wall surface of the back plate and the two side plates by the first fixing frame, and the second thermal insulation layer is limited to the inner wall surface of the cover plate by the second fixing frame.

10. The combustion chamber housing according to claim 9, characterized in that The first heat-insulating layer is an integrated structure, and / or the second heat-insulating layer is an integrated structure; The first fixing frame is an integral structure, and / or the second fixing frame is an integral structure.

11. 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, and the flexible heat insulation cotton can swing between the fixing frame and the frame.

12. The combustion chamber housing according to claim 11, 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. A gas water heater, characterized in that: It comprises a burner, a heat exchanger, a fan and a combustion chamber shell according to any one of claims 1 to 12, wherein the heat exchanger is arranged above the combustion chamber shell, and the burner is arranged below the combustion chamber shell; The fan is arranged above the heat exchanger, or the fan is arranged below the burner; The distance between the lower surface of the heat exchanger and the combustion surface of the burner is between 80 mm and 110 mm.

14. The gas water heater according to claim 13, 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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