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 and a heat insulation layer, 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 and is at least arranged on the mounting plate for separating the mounting plate from the heat exchanger; the mounting plate is provided with a convex hull protruding towards the heat insulation layer, and the convex hull abuts against the heat insulation layer. According to the technical scheme, the heat exchange efficiency can be improved, and meanwhile the effects of preventing wall surface overtemperature and reducing water cut-off temperature rise can be achieved.

Description

Technical Field

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

[0002] A gas water heater refers to a gas device 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 gas burns in the combustion chamber, the temperature of the housing of the combustion chamber is relatively high, and it is easy to have the problem that the high-temperature heat energy of the combustion chamber is transferred to the heat exchanger, resulting in a relatively high stop water temperature rise. Summary of the Utility Model

[0004] The main purpose of the utility model is to propose a combustion chamber housing, aiming to reduce the temperature of the combustion chamber wall surface and reduce the stop water temperature rise.

[0005] To achieve the above purpose, the combustion chamber housing proposed by the utility model includes:

[0006] A frame body, the inner cavity of which forms a combustion chamber, and the frame body is provided with a mounting plate for connecting with a heat exchanger above the combustion chamber; and

[0007] A heat insulation layer, which is arranged on the inner wall surface of the frame body and is at least arranged on the mounting plate to separate the mounting plate from the heat exchanger;

[0008] Wherein, the mounting plate is provided with a convex bump protruding towards the heat insulation layer, and the convex bump abuts against the heat insulation layer.

[0009] In an embodiment of the present application, the convex bump is in extrusion fit with the heat insulation layer.

[0010] In an embodiment of the present application, in the normal direction of the outer wall surface of the mounting plate, the depth dimension d of the convex bump satisfies: 3mm ≤ d ≤ 5mm.

[0011] In an embodiment of the present application, the projection shape of the convex bump on the outer surface of the mounting plate is rectangular; the convex bump extends along the width direction of the mounting plate.

[0012] In an embodiment of the present application, the frame body includes:

[0013] A bottom frame, including a back plate and two side plates respectively arranged on opposite sides of the back plate, the back plate and the two side plates enclose a cavity with one side open, and the upper edge of the back plate is provided with one of the mounting plates; and

[0014] 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 cover plate extends upward to form another mounting plate;

[0015] The two mounting plates are respectively arranged on opposite sides of the fin group of the heat exchanger, each mounting plate is provided with the convex bump, and the heat insulation layer is used to be sandwiched between the convex bump and the fin group.

[0016] In one embodiment of the present application, the combustion chamber housing further comprises a fixing frame located on a side of the heat insulation layer away from the mounting plate, and the fixing frame is fixed to the frame to limit the heat insulation layer;

[0017] The position of the fixing frame corresponding to the heat exchanger is hollowed out.

[0018] In one embodiment of the present application, the heat insulation layer is at least partially disposed around the combustion chamber;

[0019] The fixing frame at least covers the portion of the heat insulation layer corresponding to the combustion chamber.

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

[0021] A plate body, which is arranged to cover the surface of the heat insulation layer facing the combustion chamber, and the plate body is hollowed out at a position corresponding to the heat exchanger;

[0022] 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 of the flange extends toward the inner wall surface of the frame body to limit the edge of the heat insulation layer; and

[0023] A fixing lug is arranged on a side of the flange facing away from the plate body, and the fixing lug is fixedly connected to the frame body.

[0024] In one embodiment of the present application, the thermal insulation layer is a flexible thermal insulation cotton;

[0025] The flexible heat-insulating cotton is silicate fiber, silicon dioxide fiber or glass fiber.

[0026] To achieve the above object, the present application also provides a gas water heater, comprising a burner, a heat exchanger 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;

[0027] The heat insulation layer is located between the fin group of the heat exchanger and the convex bulge.

[0028] In the combustion chamber housing of the technical solution of the present utility model, by providing a heat insulation layer on the inner wall surface of the frame body, when the gas water heater is discharging water normally, the heat insulation layer can block the heat transfer in the combustion chamber to the frame body, reduce the surface temperature of the frame body, and reduce the heat storage capacity of the frame body; the frame body is provided with a mounting plate for connecting with the heat exchanger above the combustion chamber, and the heat insulation layer is at least provided on the mounting plate to separate the mounting plate from the heat exchanger, so that when the gas water heater stops discharging water, the heat insulation layer can block the heat transfer on the mounting plate to the fin group of the heat exchanger, and there will be no excessive heat to heat the stagnant water. Thus, the rise in water temperature during shutdown can be effectively improved. At the same time, by providing a convex bump protruding towards the heat insulation layer on the mounting plate, the convex bump abuts against the heat insulation layer, so that the heat insulation layer in direct contact with the heat exchanger has a certain compression amount, thereby reducing the gaps between the mounting plate and the heat insulation layer, inside the heat insulation layer, and between the heat insulation layer and the heat exchanger, preventing the high-temperature flue gas from flowing away between the mounting plate and the heat exchanger without passing through the heat exchanger for heat exchange. While improving the heat exchange efficiency, it can also prevent the wall surface from overheating and reduce the rise in water temperature during shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic structural diagram of an embodiment of the combustion chamber housing of the present utility model;

[0031] Figure 2 It is a schematic structural diagram of the frame body of the embodiment of the present utility model;

[0032] Figure 3 For Figure 1 The longitudinal sectional view of the embodiment;

[0033] Figure 4 For Figure 3 The partial enlarged view at M in;

[0034] Figure 5 For Figure 3 The partial enlarged view at N in;

[0035] Figure 6 It is a schematic structural diagram of the cooperation of the bottom frame, the heat insulation layer and the fixing frame in the embodiment of the present utility model;

[0036] Figure 7 For Figure 6 The explosion schematic diagram of the embodiment;

[0037] Figure 8 Schematic diagram of the mating structure of the cover plate, heat insulation layer and fixing bracket in the embodiment of the present utility model;

[0038] Figure 9 is Figure 8 explosion diagram of the embodiment;

[0039] Figure 10 Side view of the fixing bracket in the embodiment of the present utility model;

[0040] Figure 11 Partial schematic diagram of the gas water heater of the present utility model;

[0041] Figure 12 is Figure 11 Schematic diagram of the structure when the cover plate of the embodiment in is opened.

[0042] Explanation of the reference numerals in the drawings:

[0043]

[0044]

[0045] The realization, functional characteristics and advantages of the object of the present utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0046] 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 creative efforts shall fall within the protection scope of the present utility model.

[0047] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between the components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0048] At the same time, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three solutions. Taking "A and / or B" as an example, it includes the A solution, or the B solution, or the solution where A and B are satisfied simultaneously.

[0049] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and should not 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", "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments may 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.

[0050] 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 usage process, the water in the heat exchanger does not flow, and the heat accumulated in the shell of the combustion chamber and the fins of the heat exchanger due to heat conduction will be conducted to 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 usage location, making the user feel a burning sensation, that is, the problem of water temperature rise during shutdown.

[0051] In the related art, a heat insulation layer is provided between the shell of the combustion chamber and the heat exchanger to insulate heat and reduce the heat transfer from the shell of the combustion chamber to the heat exchanger, so as to improve the water temperature rise during shutdown. However, the heat insulation layer between the heat exchanger and the shell of the combustion chamber is relatively loose, and the high-temperature flue gas may flow away directly from between the fins of the heat exchanger and the heat insulation layer, between the heat insulation layer and the shell of the combustion chamber, or the internal gap of the heat insulation layer without passing through the heat exchanger for heat exchange, resulting in the problem of low heat exchange efficiency; at the same time, due to the change in the flow direction of the high-temperature flue gas (preferably flowing away from the gap with less resistance), it will cause the flame and high-temperature flue gas to deflect towards the outer frame direction, and also cause the problem of excessive wall surface temperature rise.

[0052] For this reason, the present utility model proposes a combustion chamber shell, aiming to squeeze the heat insulation layer 3 by providing a convex bulge 131 at the position of the combustion chamber shell corresponding to the heat exchanger 4, so that the heat insulation layer 3 in direct contact with the heat exchanger 4 has a certain compression amount, preventing the high-temperature flue gas from flowing away between the two, improving the heat exchange efficiency, and reducing the water temperature rise during shutdown. It can be understood that, as Figure 11 and Figure 12, the gas water heater includes a combustion chamber housing, a heat exchanger 4, a burner 5, and a blower. A combustion chamber that penetrates vertically is formed inside the combustion chamber housing. The heat exchanger 4 is provided above the combustion chamber housing, and the burner 5 is located below the combustion chamber housing. The burner 5 serves to ignite and burn. 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 exhaust gas after heat exchange. Hereinafter, the structure of this combustion chamber housing will be described by way of examples.

[0053] As Figures 1 to 5 shown, the combustion chamber housing includes a frame body 1 and a heat insulation layer 3. A combustion chamber is formed inside the inner cavity 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; the heat insulation layer 3 is provided on the inner wall surface of the frame body 1 and is at least provided on the mounting plate 13 to be used for separating the mounting plate 13 from the heat exchanger 4; wherein, the mounting plate 13 is provided with a convex protrusion 131 protruding towards the heat insulation layer 3, and the convex protrusion 131 abuts against the heat insulation layer 3.

[0054] The inner cavity of the frame body 1 forms a combustion chamber. By providing the heat insulation layer 3 on the inner wall surface of the frame body 1, the heat insulation layer 3 can play a role in isolating the high-temperature flue gas from the frame body 1, preventing the heat in the combustion chamber from being transferred to the frame body 1, and achieving the purpose of reducing the surface temperature 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. Optionally, the frame body 1 has two relatively arranged mounting plates 13 above the combustion chamber. An installation opening for installing the heat exchanger 4 is formed between the two mounting plates 13. When the heat exchanger 4 is installed in the installation opening, the two mounting plates 13 are respectively located on the 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 non-flowing water. Thus, the problem of the temperature rise of the stopped water can be effectively improved.

[0055] By providing a convex protrusion 131 protruding towards the heat insulation layer 3 on the mounting plate 13, and the convex protrusion 131 abuts against the heat insulation layer 3, the heat insulation layer 3 can be subjected to the extrusion action of the convex protrusion 131 and the heat exchanger 4, so as to reduce the gaps between the mounting plate 13 and the heat insulation layer 3, inside the heat insulation layer 3, and between the heat insulation layer 3 and the heat exchanger 4, increase the air flow resistance, and prevent the high-temperature flue gas from flowing away between the mounting plate 13 and the heat exchanger 4 without passing through the heat exchanger 4 for heat exchange. Such a design can, on the one hand, improve the heat exchange efficiency of the heat exchanger 4, and on the other hand, prevent the high-temperature flue gas from having a tendency to flow outside the frame body 1, and can play a role in preventing wall surface overheating and reducing the temperature rise of the stopped water.

[0056] In actual application, the shape and structure of the convex hull 131 can be determined according to the actual situation. For example, it can be a rectangular convex hull 131, a circular convex hull 131, a strip-shaped convex hull 131, or other convex hull 131 structures of some other shapes, etc. The formation of the convex hull 131 can be formed by pressing the wall surface of the mounting plate 13, for example, it can be manufactured by stamping.

[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 it can be integrally formed by bending a sheet metal part, which simplifies the forming process and improves the production efficiency.

[0058] In actual application, the heat insulation layer 3 can be only adapted to the shape of the inner wall surface of the mounting plate 13, or can be adapted to the shape of the inner wall surface of the frame body 1, or can also be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulation layer 3 is at least provided on the mounting plate 13. It can be understood that the heat insulation layer 3 is only provided on the inner wall surface of the mounting plate 13, or can be surrounded around the combustion chamber, or the heat insulation layer 3 can be provided at other parts in addition to the periphery of the combustion chamber.

[0059] 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 adopt a heat insulation board, flexible heat insulation cotton or other heat insulation structures, etc. 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 stationary 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 shell and reduce the heat transferred to the heat exchanger 4, effectively improving the temperature rise of the stop water. In addition, the flexible and fluffy characteristics of the flexible heat insulation cotton such as flexibility and cotton can also play a role in buffering and sound absorption, achieving the effect of noise reduction without the need to additionally set 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, etc., as long as it can play a role in fire prevention and heat insulation.

[0060] 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. 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, so that too much heat will not heat the non-flowing water. Thus, the temperature rise during shutdown can be effectively improved. At the same time, by providing a convex protrusion 131 protruding towards the heat insulation layer 3 on the mounting plate 13, the convex protrusion 131 abuts against the heat insulation layer 3, so that the heat insulation layer 3 in direct contact with the heat exchanger 4 has a certain compression amount, thereby reducing the gaps between the mounting plate 13 and the heat insulation layer 3, inside the heat insulation layer 3, and between the heat insulation layer 3 and the heat exchanger 4, preventing high-temperature flue gas from flowing away between the mounting plate 13 and the heat exchanger 4 without passing through the heat exchanger 4 for heat exchange, improving the heat exchange efficiency, and also playing a role in preventing wall surface overheating and reducing the temperature rise during shutdown.

[0061] In an embodiment of the present application, as Figures 3 to 5 , the convex protrusion 131 and the heat insulation layer 3 are in extrusion fit.

[0062] In this embodiment, by providing the convex protrusion 131 and the heat insulation layer 3 in extrusion fit, after being assembled with the heat exchanger 4, the heat insulation layer 3 between the convex protrusion 131 and the fin group of the heat exchanger 4 can have a certain compression amount, and at the same time, the gaps between the mounting plate 13 and the heat insulation layer 3 and between the heat insulation layer 3 and the fin group of the heat exchanger 4 can be effectively reduced, so that the heat insulation layer 3 at this place can fit with the convex protrusion 131 and the fin group. Thus, the air flow resistance between the mounting plate 13 and the fin group of the heat exchanger 4 can be increased, thereby preventing high-temperature flue gas from flowing away from this place, enabling more high-temperature flue gas to flow through the heat exchanger 4 and exchange heat with it, and ensuring the heat exchange efficiency.

[0063] In actual application, the extrusion fit can be understood as that the convex protrusion 131 has an extrusion and holding force on the heat insulation layer 3, so that the heat insulation layer 3 can be extruded and compressed by the convex protrusion 131.

[0064] Further, as Figures 3 to 5 , in the normal direction of the outer wall surface of the mounting plate 13, the depth dimension d of the convex protrusion 131 satisfies: 3 mm ≤ d ≤ 5 mm.

[0065] It can be understood that the depth of the convex hull 131 protruding inward relative to the outer wall surface of the mounting plate 13 should neither be too small nor too large. If it is too small, it may not be able to achieve the effect of squeezing the heat insulation layer 3, resulting in high-temperature flue gas flowing away directly through the gap between the mounting plate 13 and the heat exchanger 4 without heat exchange. If it is too large, it may compress the heat insulation layer 3 too much and affect the heat insulation ability of the heat insulation layer 3. Based on this, in this embodiment, in the normal direction of the outer wall surface of the mounting plate 13, the depth dimension d of the convex hull 131 is set to satisfy: 3 mm ≤ d ≤ 5 mm. On the one hand, it can prevent high-temperature flue gas from flowing away through the gap between the mounting plate 13 and the heat exchanger 4, ensuring the heat exchange efficiency. On the other hand, it can ensure the heat insulation ability of the heat insulation layer 3.

[0066] In actual application, the depth d of the convex hull 131 can be selected as 3 mm, 3.3 mm, 3.5 mm, 3.7 mm, 4 mm, 4.1 mm, 4.4 mm, 4.5 mm, 4.8 mm or 5 mm, etc. Preferably, the depth d of the convex hull 131 is selected as 4 mm.

[0067] In an embodiment of the present application, as Figure 2 , the projection shape of the convex hull 131 on the outer surface of the mounting plate 13 is rectangular.

[0068] By setting the convex hull 131 to a structure with a rectangular cross-sectional shape, compared with other shapes such as circular and strip-shaped, the area of the convex hull 131 can be increased, the acting area between the convex hull 131 and the heat insulation layer 3 can be increased, so that the heat insulation layer 3 is stressed more evenly, ensuring the structural reliability of the heat insulation layer 3 and preventing local stress from being too large and causing damage.

[0069] In an embodiment of the present application, the convex hull 131 extends along the width direction of the mounting plate 13.

[0070] It can be understood that the width direction of the mounting plate 13 is the extending direction of the heat exchange tubes in the heat exchanger 4, and the fin groups are distributed along the length direction of the heat exchange tubes. By extending the convex hull 131 along the width direction of the mounting plate 13, the extending direction of the convex hull 131 is made consistent with the distribution direction of the fin groups, so that the squeezed part of the heat insulation layer 3 extends along the distribution direction of the fin groups, thereby being able to extend the width of the squeezed part of the heat insulation layer 3 and achieving a better effect of preventing high-temperature flue gas from flowing away through the gap between the mounting plate 13 and the heat exchanger 4.

[0071] In an embodiment of the present application, as Figure 2 , Figure 3 , Figure 6 , Figures 7 to 9The 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 respectively arranged 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. A mounting plate 13 is arranged on the upper edge of the back plate 111; the cover plate 12 is arranged on the open cavity and connected with the two side plates 112 to enclose the bottom frame 11 to form a combustion chamber with upper and lower openings; the cover plate 12 extends upward to form another mounting plate 13;

[0072] The two mounting plates 13 are respectively arranged on opposite sides of the fin group of the heat exchanger 4 , each mounting plate 13 is provided with a convex bump 131 , and the heat insulation layer 3 is used to be sandwiched between the convex bump 131 and the fin group.

[0073] In this embodiment, the upper and lower sides of the bottom frame 11 are open, and are used to connect the heat exchanger 4 and the burner 5 respectively. Specifically, the bottom frame 11 includes a back plate 111 and two side plates 112 arranged 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 roughly present a "匚" shape. By covering the open part with a cover plate 12, the "匚"-shaped structure is roughly transformed into a "口"-shaped cross-sectional shape, thereby forming a combustion chamber that is open at the top and bottom and closed on all sides. A mounting plate 13 is provided on the upper edge of the back plate 111, and the cover plate 12 extends upward to form another mounting 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 mounting plates 13, and the fin group is clamped between the two mounting plates 13. On this basis, each mounting plate 13 is provided with a bulge 131, and the heat insulation layer 3 is sandwiched between the corresponding bulge 131 and the fin group, so that no high-temperature flue gas will flow away on the opposite sides of the fin group, further ensuring the heat exchange efficiency.

[0074] In practical applications, the bottom frame 11 can be directly formed into a "匚"-shaped structure by bending a sheet metal plate, which simplifies the manufacturing process and improves production efficiency. The assembly of the cover plate 12 and the bottom frame 11 can be fixed by screws or buckles. The heat exchanger 4 can be fixed by screws, riveting or clamping through the end plate and the two mounting plates 13 and the corresponding side plates 112.

[0075] In one embodiment of the present application, Figure 1 , Figure 3 , Figures 6 to 10 The combustion chamber housing further includes a fixing frame 2 located on a side of the heat insulation layer 3 away from the mounting plate 13 , and the fixing frame 2 is fixed to the frame body 1 to limit the heat insulation layer 3 .

[0076] In this embodiment, the fixing frame 2 is provided to limit the heat insulation layer 3 to ensure the installation reliability of the heat insulation layer 3 and prevent the heat insulation layer 3 from falling off. Optionally, the fixing frame 2 can cover the portion of the heat insulation layer 3 away from the installation side to increase the limiting area of ​​the heat insulation layer 3, which can improve the assembly reliability of the heat insulation layer 3 during transportation or handling to prevent it from breaking and falling off, and can also prevent the slag from falling off if the heat insulation layer 3 falls off after the gas water heater is used for a long time.

[0077] In practical applications, the specific structure of the fixing frame 2 can be determined according to actual conditions, for example, it can be a plate structure, a block structure or other types of structures, etc. Optionally, the fixing frame 2 and the frame 1 can be fixed by screws, welding, clamping or other fixing methods.

[0078] Furthermore, the position of the fixing frame 2 corresponding to the heat exchanger 4 is hollowed out.

[0079] It is understandable that the fixing frame 2 is located on the side of the heat insulation layer 3 close to the combustion chamber. During combustion, the temperature of the fixing frame 2 is as high as 300°C or more. If the fixing frame 2 is in contact with the heat exchanger 4, the heat of the fixing frame 2 will be transferred to the water in the heat exchange tube through the fin group after the water supply is cut off, causing the water temperature to rise significantly. When the water is turned on again, there will be a section of high-temperature water to scald the user. To this end, this embodiment hollows out the part of the fixing frame 2 corresponding to the heat exchanger 4, reduces the contact area between the fixing frame 2 and the heat exchanger 4, reduces the heat exchange area between the fixing frame 2 and the heat exchanger 4, and allows the heat insulation layer 3 to directly contact the fin group of the heat exchanger 4, so as to avoid the heat of the fixing frame 2 being directly transferred to the heat exchanger 4 after the water supply is cut off, causing the water supply temperature to rise higher.

[0080] Specifically, the portion of the fixing frame 2 corresponding to the fin group of the heat exchanger 4 is hollowed out to avoid direct contact between the fixing frame 2 and the fin group.

[0081] Furthermore, if Figures 6 to 10 The heat insulation layer 3 is at least partially arranged around the combustion chamber.

[0082] 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.

[0083] 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.

[0084] Furthermore, the fixing frame 2 at least covers the portion of the heat insulation layer 3 corresponding to the combustion chamber.

[0085] In actual application, the heat insulation layer 3 may not only break and fall off when it collides or falls, but it may also drop debris and block the flue after the gas water heater has been used for a long time. Based on this, in this embodiment, by making the fixing frame 2 at least cover the area of ​​the heat insulation layer 3 corresponding to the combustion chamber, the limiting area of ​​the heat insulation layer 3 is increased. On the one hand, it can improve the assembly reliability of the heat insulation layer 3 during transportation or handling to prevent it from breaking and falling off. On the other hand, it can prevent the debris from falling if the heat insulation layer 3 drops debris after the gas water heater has been used for a long time. Therefore, compared with the method of limiting the heat insulation layer 3 by screws or mesh structures in the related art, this embodiment can further improve the structural reliability of the heat insulation layer 3 and achieve a better limiting effect.

[0086] The fixing frame 2 at least covers the portion of the thermal insulation layer 3 corresponding to the combustion chamber. It is understandable that the fixing frame 2 may only cover the portion of the thermal insulation layer 3 corresponding to the combustion chamber, or may also cover other portions of the thermal insulation layer 3 such as portions corresponding to the heat exchanger 4 / flue, etc., or may also completely wrap the thermal insulation layer 3.

[0087] In one embodiment of the present application, Figures 6 to 10 The fixing frame 2 includes a plate body 21, a flange 22 and a fixing lug 23. The plate body 21 is covered on the surface of the heat insulation layer 3 facing the combustion chamber, and the plate body 21 is hollowed out at the position corresponding to the heat exchanger 4; 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 1 to limit the edge of the heat insulation layer 3; the fixing lug 23 is arranged on the side of the flange 22 away from the plate body 21, and the fixing lug 23 is fixedly connected to the frame 1.

[0088] This embodiment illustrates the structure of the fixing frame 2 by way of example, the plate body 21 serves to limit the surface of the heat insulating layer 3, the flange 22 serves to limit the edge of the heat insulating layer 3, and the fixing lug 23 serves to fix the connection frame 1. By providing the plate body 21 and the flange 22 at the same time, the function of limiting both the surface and the edge of the heat insulating layer 3 is achieved, thereby achieving a better limiting assembly effect on the heat insulating layer 3.

[0089] It can be understood that the flange 22 is extended from the plate body 21 toward the inner wall surface of the frame body 1, and the flange 22, the plate body 21 and the inner wall surface of the frame body 1 enclose an installation cavity for installing the insulation layer 3, which can prevent the insulation layer 3 from expanding and bulging during the combustion process, causing the volume of the combustion cavity to change. If the insulation layer 3 expands inward, the flame may directly burn the insulation layer 3 and cause the wall surface to overheat; and the flame will not burn completely when it contacts the insulation layer 3, resulting in excessive smoke; the change in the volume of the combustion chamber will also cause the volumetric heat intensity of the combustion system to increase, thereby stimulating combustion resonance.

[0090] Optionally, the plate body 21 has an upper edge, a lower edge, and a plurality of side edges disposed between the upper edge and the lower edge. Correspondingly, flanges 22 are provided on the upper edge, the lower edge, and the side edges. 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.

[0091] The fixing lug 23 is provided on the flange 22 to be fixedly connected to the frame body 1, realizing the fixed assembly of the fixing frame 2 and the frame body 1. Such a design can avoid punching 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.

[0092] Optionally, the fixing lug 23 can be formed by folding the side of the flange 22 away from the plate body 21, or the fixing lug 23 can also be fixedly installed on the flange 22 by fixing methods such as welding and clamping. In this embodiment, considering cost and forming difficulty, the fixing lug 23 is formed by folding the side of the flange 22 away from the plate body 21. Optionally, the fixing lug 23 is perpendicularly connected to the flange 22 to enhance the structural strength of the fixing frame 2 by using a right-angle structure. Optionally, the fixing lug 23 and the frame body 1 can be fixed by screwing or welding.

[0093] Furthermore, as Figure 10 , the fixing lug 23 protrudes towards the frame body 1 relative to the flange 22, so that there is a gap between the flange 22 and the frame body 1.

[0094] In this embodiment, by protruding the fixing lug 23 towards the frame body 1 relative to the flange 22, there is a gap between the flange 22 and the frame body 1. Thus, except for the part where the fixing lug 23 of the fixing frame 2 is in contact with the frame body 1 for fixed cooperation, other parts of the fixing frame 2 are not in contact with the frame body 1. Thereby, the contact area between the fixing frame 2 and the frame body 1 can be reduced, the heat transfer area can be reduced, and the situation of excessive heat transfer from the combustion chamber fixing bracket to the frame body 1, resulting in too high a temperature rise of the stop water, can be prevented.

[0095] As an example, the flange 22 can be retracted 2 mm to 4 mm relative to the corresponding fixing lug 23.

[0096] In practical applications, the number of fixed lugs 23 can be determined according to actual situations. For example, one fixed lug 23 can be provided on each flanging 22, or one fixed lug 23 can be provided on some flangings 22, and two or more fixed lugs 23 can be provided on some flangings 22, etc. When two or more fixed lugs 23 are provided on a flanging 22, the two or more fixed 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 fixed bracket. Exemplarily, two fixed lugs 23 are respectively provided on the flangings 22 at the upper and lower edges of the plate body 21, and the two fixed lugs 23 are spaced transversely; one fixed lug 23 is provided on the flanging 22 at the side edge of the plate body 21, and this fixed lug 23 is located at the middle position in the vertical direction.

[0097] In an embodiment of the present application, the heat insulation layer 3 can adopt a flexible heat insulation cotton made of silicate fiber or silica fiber or glass fiber. Exemplarily, the flexible heat insulation cotton adopts 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 plates, which is 0.36 g / cm3. Thus, in the same volume, this embodiment can greatly reduce the heat storage capacity and effectively reduce the water temperature rise during shutdown. 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.

[0098] 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 embodiment. Since this gas water heater adopts all the technical solutions of the above all 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 convex hull 131.

[0099] 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.

[0100] 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 under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or directly / indirectly applied 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, 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; and A heat insulation layer, provided on the inner wall surface of the frame body and at least provided on the mounting plate to separate the mounting plate from the heat exchanger; Wherein, the mounting plate is provided with a convex hump protruding toward the heat insulation layer, and the convex hump is in contact with the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that The convex hull is extrusion-fitted with the heat insulation layer.

3. The combustion chamber housing according to claim 1, characterized in that In the normal direction of the outer wall of the mounting plate, the depth dimension d of the convex hull satisfies: 3mm≤d≤5mm.

4. The combustion chamber housing according to claim 1, characterized in that The projection shape of the convex hull on the outer surface of the mounting plate is rectangular; The convex bump 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 frame comprises: The bottom frame comprises a back plate and two side plates respectively arranged on opposite sides of the back plate, wherein the back plate and the two side plates are combined to form a cavity with one side open; the upper edge of the back plate is provided with a mounting plate; 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 cover plate extends upward to form another mounting plate; The two mounting plates are respectively arranged on opposite sides of the fin group of the heat exchanger, each mounting plate is provided with the convex bump, and the heat insulation layer is used to be sandwiched between the convex bump and the fin group.

6. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The combustion chamber housing further comprises a fixing frame located on a side of the heat insulation layer away from the mounting plate, the fixing frame being fixed to the frame to limit the heat insulation layer; The position of the fixing frame corresponding to the heat exchanger is hollowed out.

7. The combustion chamber housing according to claim 6, characterized in that The heat insulation layer is at least partially disposed around the combustion chamber; The fixing frame at least covers the portion of the heat insulation layer corresponding to the combustion chamber.

8. The combustion chamber housing according to claim 7, characterized in that The fixing frame comprises: A plate body, which is arranged to cover the surface of the heat insulation layer facing the combustion chamber, and the plate body is hollowed out at a position corresponding to the heat exchanger; 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 of the flange extends toward the inner wall surface of the frame body to limit the edge of the heat insulation layer; and A fixing lug is arranged on a side of the flange facing away from the plate body, and the fixing lug is fixedly connected to the frame body.

9. 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.

10. 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 9, 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 convex bulge.

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