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 insulation layer and fixedly connected with the frame body to limit the heat insulation layer. And the part of the frame body, corresponding to the combustion chamber, is provided with a convex hull which is convexly arranged in the direction deviating from the heat insulation layer. According to the technical scheme, the heat insulation effect of the heat insulation layer can be guaranteed, and the purpose of reducing the surface temperature of the combustion chamber shell is achieved.

Description

Technical Field

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

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

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

[0004] In the related art, a heat insulation layer is provided on the inner wall of the combustion chamber shell to insulate and cool down. When fixing, the heat insulation layer is usually squeezed and fixed on the combustion chamber shell with fixing parts. However, this easily leads to an increase in the thermal conductivity of the heat insulation layer and a poor insulation effect. Utility Model Content

[0005] The main purpose of the utility model is to provide a combustion chamber shell, aiming to ensure the heat insulation effect of the heat insulation layer and achieve the purpose of reducing the surface temperature of the combustion chamber shell.

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

[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] A fixing frame, which is arranged on a side of the heat insulation layer away from the inner wall of the frame and is fixedly connected to the frame to limit the heat insulation layer;

[0010] Wherein, a portion of the frame corresponding to the combustion chamber is provided with a convex hump protruding in a direction away from the heat insulation layer.

[0011] In one embodiment of the present application, there is a gap between the inner wall surface of the convex hull and the thermal insulation layer.

[0012] In one embodiment of the present application, a plurality of convex points protruding toward the thermal insulation layer are provided on the outer side wall of the convex hump, and the convex points abut against the thermal insulation layer.

[0013] In one embodiment of the present application, in the normal direction of the inner wall surface of the frame, the depth of the convex point is not greater than the depth of the convex hull;

[0014] The projected shape of the convex hull on the outer surface of the frame is rectangular; and / or, the projected shape of the convex point on the outer surface of the frame is circular.

[0015] In an embodiment of the present application, in the normal direction of the inner wall surface of the frame, the depth dimension d of the convex hull satisfies: 3 mm ≤ d ≤ 5 mm.

[0016] In an embodiment of the present application, the fixing frame at least covers the area of the heat insulation layer corresponding to the combustion chamber;

[0017] The fixing frame includes:

[0018] A plate body, covering the surface of the heat insulation layer facing away from the inner wall surface of the frame, and the convex hull is arranged opposite to the plate body;

[0019] A flanging, arranged at the edge of the plate body, one end of the flanging is connected to the plate body, and the other end extends towards the inner wall surface of the frame to limit the edge of the heat insulation layer; and

[0020] A fixing lug, arranged on the side of the flanging facing away from the plate body, and the fixing lug is fixedly connected to the frame.

[0021] In an embodiment of the present application, the frame includes:

[0022] 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

[0023] A cover plate, covering the open end and connected to the two side plates to enclose the combustion chamber with upper and lower openings together with the bottom frame;

[0024] Wherein, the inner wall surfaces of the back plate, the two side plates and the cover plate are all provided with the heat insulation layer, and at least one of the back plate, the two side plates and the cover plate is provided with the convex hull.

[0025] In an embodiment of the present application, the heat insulation layer is a flexible heat insulation cotton; the flexible heat insulation cotton is silicate fiber or silica fiber or glass fiber;

[0026] The density of the flexible heat insulation cotton is less than 0.2 g / cm3.

[0027] To achieve the above object, the present application further provides a gas water heater, including a burner, a heat exchanger, a blower and the combustion chamber housing as described above, the heat exchanger is arranged above the combustion chamber housing, and the burner is arranged below the combustion chamber housing;

[0028] The blower is arranged above the heat exchanger, or, the blower is arranged below the burner.

[0029] In an embodiment of the present application, there is a gap D in the height direction between the lower surface of the heat insulation layer and the combustion surface of the burner, satisfying: 8 mm ≤ D ≤ 12 mm.

[0030] In the technical solution of the combustion chamber housing of the present utility model, by providing a heat insulation layer on the inner wall surface of the frame body, and the heat insulation layer at least surrounds the combustion chamber, when the gas water heater is working with normal water output, 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 at the same time reduce the heat storage capacity of the frame body; thus when the gas water heater stops discharging water, the frame body with a lower heat storage capacity will not transfer too much heat to the heat exchanger to heat the non-flowing water, and can effectively improve the water temperature rise during shutdown. A fixing frame is provided on the side of the heat insulation layer facing away from the inner wall surface of the frame body. By fixedly connecting the fixing frame to the frame body, the limiting function of the heat insulation layer can be realized, and the installation reliability of the heat insulation cotton can be ensured. At the same time, by providing a convex protrusion protruding away from the heat insulation layer at the part of the frame body corresponding to the combustion chamber, the convex protrusion can play a certain role in avoiding the heat insulation layer, so that when the heat insulation layer is squeezed by the fixing frame, it can have a moving space in the direction of the convex protrusion. Therefore, the degree of compression of the heat insulation layer by extrusion can be effectively reduced, the heat insulation ability of the heat insulation layer can be ensured, and further the effect of reducing the water temperature rise during shutdown can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 It is a schematic structural diagram of an embodiment of the combustion chamber housing of the present utility model;

[0033] Figure 2 It is a schematic diagram of the cooperation structure of the bottom frame, the heat insulation layer and the fixing frame in the embodiment of the present utility model;

[0034] Figure 3 For Figure 2 An exploded view of the embodiment;

[0035] Figure 4 It is a side view of the fixing frame in the embodiment of the present utility model;

[0036] Figure 5 For Figure 2 A longitudinal sectional view of the embodiment;

[0037] Figure 6 For Figure 5Partial enlarged view at K in the [diagram];

[0038] Figure 7 is Figure 5 Partial enlarged view at M in the [diagram];

[0039] Figure 8 is Figure 5 Partial enlarged view at N in the [diagram];

[0040] Figure 9 is Figure 2 Cross-sectional schematic diagram of the embodiment;

[0041] Figure 10 Schematic diagram of the cooperation structure of the cover plate, heat insulation layer and fixing frame in the embodiment of the present utility model;

[0042] Figure 11 is Figure 10 Explosion schematic diagram of the embodiment;

[0043] Figure 12 Partial schematic diagram of the gas water heater of the present utility model;

[0044] Figure 13 is Figure 12 Schematic diagram of the structure when the cover plate of the embodiment is opened.

[0045] Explanation of the attached drawing reference numerals:

[0046] Label Name Label Name 1 Frame 2 Fixing Bracket 11 Bottom Frame 21 Plate 111 Back Panel 22 Flange 112 Side Panel 23 Fixing Lug 12 Cover Plate 3 Heat Insulation Layer 101 Boss 4 Heat Exchanger 102 Bump 5 Burner

[0047] The realization, functional features and advantages of the purpose of the present utility model will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific embodiments

[0048] 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 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 making creative efforts belong to the scope of protection of the present utility model.

[0049] 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, then 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.

[0050] Meanwhile, the meaning of "and / or" or "and and / or" that appears throughout the text is that it includes three scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously.

[0051] 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. Additionally, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or is unable to 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.

[0052] 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 closes the water during the water usage process, the water in the heat exchanger does not flow. The heat accumulated in the housing 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 opens 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 water stoppage.

[0053] In the related art, a heat insulation layer is provided on the inner wall of the housing of the combustion chamber to insulate and cool down to improve the problem of water temperature rise during water stoppage. However, during fixation, a fixing member is usually used to squeeze and fix the heat insulation layer on the housing of the combustion chamber. Since the thermal conductivity of the static air in the heat insulation layer is relatively low, when the heat insulation layer is squeezed, the number of air bubbles inside it decreases and becomes solid heat transfer, and the heat insulation ability will be greatly reduced, and there will still be the problem of over-temperature of the wall surface and water temperature rise during water stoppage.

[0054] For this reason, the present utility model proposes a housing of a combustion chamber, aiming to provide a certain avoidance effect on the heat insulation layer 3 by providing an outward convex bulge 101 on the frame 1 of the combustion chamber to prevent the fixing member from squeezing the heat insulation layer 3, so as to ensure the heat insulation ability of the heat insulation layer 3. It can be understood that, as Figures 12 to 13The 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.

[0055] like Figures 1 to 3 , Figures 9 to 11 As shown, the combustion chamber shell includes a frame 1, an insulation layer 3 and a fixing frame 2; the inner cavity of the frame 1 forms a combustion chamber; 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 is fixedly connected to the frame 1 to limit the insulation layer 3; wherein, the portion of the frame 1 corresponding to the combustion chamber is provided with a convex hump 101 protruding in the direction away from the insulation layer 3.

[0056] 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.

[0057] 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 is fixedly connected to the frame 1, so as to realize the limiting function of the insulation layer 3, prevent the insulation layer 3 from colliding or falling and breaking and falling off during transportation or handling, thereby ensuring the installation reliability of the insulation layer 3.

[0058] It should be noted that when the heat insulation layer 3 is limited and installed by the fixing frame 2, in order to ensure the installation reliability of the heat insulation layer 3, the fixing frame 2 may apply an extrusion force towards the inner wall surface of the frame body 1 to the heat insulation layer 3, which may cause the situation that the heat insulation layer 3 is compressed and affects the heat insulation ability. Therefore, in this embodiment, a convex bulge 101 protruding away from the heat insulation layer 3 is provided at the part of the frame body 1 corresponding to the combustion chamber, which plays a certain avoidance role for the heat insulation layer 3, so that when the heat insulation layer 3 is squeezed by the fixing frame 2, it can have a moving space towards the convex bulge 101. Thus, the degree of extrusion and compression of the heat insulation layer 3 can be effectively reduced, and the static air inside the heat insulation layer 3 will not be squeezed out, thereby ensuring the heat insulation ability of the heat insulation layer 3.

[0059] In practical applications, the shape and structure of the convex bulge 101 can be determined according to the actual situation. For example, it can be a rectangular convex bulge 101, a circular convex bulge 101, a strip-shaped convex bulge 101 or other convex bulge 101 structures of some other shapes, etc. The convex bulge 101 can be formed by pressing the wall surface of the frame body 1, such as stamping manufacturing.

[0060] In practical applications, 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, a strip-shaped structure or other types of structures, etc. As long as the fixing frame 2 can fix the heat insulation layer 3 on the inner wall surface of the frame body 1. Optionally, the fixing frame 2 and the frame body 1 can be fixed by screwing, welding, clamping or other fixing methods, etc.

[0061] In practical applications, the heat insulation layer 3 can be adapted to the shape of the inner wall surface of the frame body 1, or can be only adapted to the shape around the combustion chamber, or can also be other shapes, etc. In this embodiment, for better heat insulation effect, the heat insulation layer 3 at least surrounds the combustion chamber. It can be understood that the heat insulation layer 3 only surrounds the combustion chamber, or the heat insulation layer 3 can be arranged in other parts in addition to the combustion chamber, such as the heat exchanger 4, the flue, etc.

[0062] It is understandable that the specific structure of the insulation layer 3 can also be determined according to actual conditions, for example, insulation boards, flexible insulation cotton or other insulation structures can be used. In order to achieve 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 related technologies, the density of the flexible insulation cotton in this embodiment is lower. The flexible insulation cotton is a porous medium with static air gaps inside. Then, under the same volume, the insulation capacity of this flexible insulation cotton is better, and the lower mass and heat storage capacity will also be lower, which can reduce the overall heat storage of the combustion chamber shell and effectively improve the water outage temperature rise. In addition, the flexible insulation cotton's flexibility, 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 wool can also be determined according to actual conditions. For example, it can be glass fiber insulation wool, mineral wool insulation wool, polyester insulation wool, ceramic fiber insulation wool, silicate insulation wool, silica insulation wool or insulation wool made of other materials, as long as it can play a fireproof and heat-insulating role.

[0063] In summary, in the combustion chamber shell of the technical solution of the utility model, a heat insulation layer 3 is arranged on the inner wall surface of the frame 1, and the heat insulation layer 3 is at least arranged around the combustion chamber, so that when the gas water heater is working normally, the heat insulation layer 3 can block the heat in the combustion chamber from being transferred to the frame 1, reduce the surface temperature of the frame 1, and reduce the heat storage 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 too much heat to the heat exchanger 4 to heat the stagnant water, which can effectively improve the temperature rise when the water is stopped. A fixing frame 2 is provided on the side of the heat insulation layer 3 that is away from the inner wall surface of the frame 1. The fixing frame 2 is fixedly connected to the frame 1, so that the limiting function of the heat insulation layer 3 can be realized, and the installation reliability of the heat insulation cotton can be ensured. At the same time, by providing a convex hump 101 protruding away from the insulation layer 3 at the position of the frame 1 corresponding to the combustion chamber, the convex hump 101 can play a certain avoidance role for the insulation layer 3, so that the insulation layer 3 can have moving space in the direction of the convex hump 101 when being squeezed by the fixing frame 2, thereby the degree of squeezing and compression of the insulation layer 3 can be effectively reduced, thereby ensuring the insulation capacity of the insulation layer 3, and further ensuring the effect of reducing the temperature rise when the water is cut off.

[0064] In one embodiment of the present application, Figure 5 , Figure 6 as well as Figure 9 There is a gap between the inner wall surface of the convex hump 101 and the thermal insulation layer 3.

[0065] In this embodiment, by providing a gap between the inner wall surface of the convex hull 101 and the heat insulation layer 3, an air cavity can be formed between the heat insulation layer 3 and the inner wall surface of the convex hull 101. Such a setting can, on the one hand, prevent the heat insulation layer 3 from being compressed when it is squeezed and installed by the fixing frame 2, ensuring the heat insulation ability; on the other hand, it can reduce the contact area between the heat insulation layer 3 and the frame body 1, reduce the heat transfer area, and prevent excessive heat from the combustion chamber from being transferred to the frame body 1, causing the wall surface temperature to exceed the limit.

[0066] Further, as Figure 6 , in the normal direction of the inner wall surface of the frame body 1, the depth dimension d of the convex hull 101 satisfies: 3 mm ≤ d ≤ 5 mm.

[0067] It can be understood that the outward convex height of the convex hull 101 relative to the inner wall surface of the frame body 1 should neither be too small nor too large. If it is too small, it may not be able to achieve the effect of avoiding the heat insulation layer 3, and the heat insulation layer 3 will still be compressed greatly, affecting the heat insulation ability; if it is too large, it may not be able to play a limiting role on the heat insulation layer 3, and at the same time, it will cause the overall volume of the frame body 1 to be relatively large. Based on this, in this embodiment, in the normal direction of the inner wall surface of the frame body 1, the depth dimension d of the convex hull 101 is set to satisfy: 3 mm ≤ d ≤ 5 mm. On the one hand, it can reduce the degree of compression of the heat insulation layer 3 to ensure the heat insulation ability; on the other hand, it can ensure the installation reliability of the heat insulation layer 3 and will not cause the overall volume of the frame body 1 to be relatively large.

[0068] In actual application, the depth d of the convex hull 101 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 101 is selected as 4 mm.

[0069] Further, as Figure 5 、 Figure 6 and Figure 9 , a number of convex points 102 protruding towards the heat insulation layer 3 are provided on the outer side wall of the convex hull 101, and the convex points 102 are in contact with the heat insulation layer 3.

[0070] In this embodiment, by providing a number of convex points 102 facing inward on the convex hull 101, the number of convex points 102 can hold the heat insulation layer 3, improving the installation reliability of the heat insulation layer 3. At the same time, a certain gap is maintained between the heat insulation layer 3 and the inner wall surface of the convex hull 101, preventing the heat insulation layer 3 from coming into large-area contact with the frame body 1 and causing solid-state heat transfer, which is likely to cause the frame body 1 to heat up rapidly. When there is a certain gap between the heat insulation layer 3 and the frame body 1, since the thermal conductivity of still air is very low, the heat transferred from the heat insulation layer 3 to the frame body 1 can be effectively reduced, and the wall surface temperature rise can be reduced.

[0071] Optionally, the number of the convex points 102 can be determined according to the actual situation, for example, it can be one, two or more. When there are two or more convex points 102 provided on one convex hull 101, the multiple convex points 102 can be distributed at intervals on the convex hull 101. Optionally, the multiple convex points 102 can be distributed in an array.

[0072] Furthermore, as Figure 5 , Figure 6 and Figure 9 , in the normal direction of the inner wall surface of the frame body 1, the depth of the convex point 102 is not greater than the depth of the convex hull 101.

[0073] In this embodiment, by setting the depth of the convex point 102 to be not greater than the depth of the convex hull 101, the abutting effect of the convex point 102 on the heat insulation layer 3 will not be too tight, preventing the heat insulation layer 3 from being overly compressed when being limited by the fixing frame 2 and affecting the heat insulation effect.

[0074] In one embodiment, the projection shape of the convex hull 101 on the outer surface of the frame body 1 is rectangular. By setting the convex hull 101 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 101 can be increased, thereby providing a larger deformation space for the heat insulation cotton, and at the same time, the contact area between the heat insulation layer 3 and the frame body 1 can be further reduced, reducing the heat transfer area and improving the heat insulation effect. As an example, the convex hull 101 can be set to a structure extending transversely along the frame body 1. On this basis, a plurality of convex points 102 distributed at intervals can be provided in the extending direction thereof.

[0075] In one embodiment, the projection shape of the convex point 102 on the outer surface of the frame body 1 is circular. With this setting, while achieving the abutting effect on the heat insulation layer 3, the contact area with the heat insulation layer 3 can also be reduced.

[0076] Optionally, the convex hull 101 can be formed by pressing the frame body 1; optionally, the convex point 102 can be formed by pressing the convex hull 101.

[0077] In one embodiment of the present application, as Figure 2 , Figure 5 and Figure 10 , the fixing frame 2 at least covers the area of the heat insulation layer 3 corresponding to the combustion chamber.

[0078] 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, it can improve the assembly reliability of the heat insulation layer 3 during transportation or handling 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.

[0079] 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, or it can even completely wrap the heat insulation layer 3.

[0080] Specifically, as Figures 2 to 4 and Figure 10 and Figure 11 , the fixing frame 2 includes a plate body 21, a flanging 22 and a fixing lug 23. The plate body 21 is covered on the surface of the heat insulation layer 3 facing away from the inner wall surface of the frame body 1, and the convex boss 101 is arranged opposite to the plate body 21; the flanging 22 is arranged at the edge of the plate body 21. One end of the flanging 22 is connected to the plate body 21, and the other end extends towards the inner wall surface of the frame body 1 to limit the edge of the heat insulation layer 3; the fixing lug 23 is arranged 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.

[0081] This embodiment exemplifies the structure of the fixing frame 2. The plate body 21 plays a role in limiting the surface of the heat insulation layer 3, the flanging 22 plays a role in limiting the edge of the heat insulation layer 3, and the fixing lug 23 plays a role in fixedly connecting the frame body 1. By simultaneously arranging 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 realized, and a better limiting and assembling effect on the heat insulation layer 3 is achieved.

[0082] 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 a mounting cavity for mounting the heat insulation layer 3. By arranging the convex hump 101 relative to the plate body 21, when the plate body 21 squeezes the heat insulation layer 3, the convex hump 101 can play a role of avoiding the heat insulation layer 3, so that the heat insulation layer 3 has sufficient deformation space to prevent the heat insulation layer 3 from being compressed. In addition, such a design can prevent the heat insulation layer 3 from expanding and bulging inward during the combustion process, causing the volume of the combustion cavity to change. If the heat insulation layer 3 expands inward, it may cause the flame to directly burn the heat insulation layer 3, causing the wall surface to overheat; and the flame will not burn completely when it contacts the heat insulation layer 3, resulting in excessive smoke; the change in the volume of the combustion chamber will also increase the volumetric heat intensity of the combustion system and stimulate combustion resonance.

[0083] By setting a fixing lug 23 on the flange 22 and fixing it to the frame 1, fixed assembly of the fixing frame 2 and the frame 1 is achieved. This design can avoid drilling assembly holes on the plate 21 and the insulation layer 3, further ensuring the wrapping effect of the plate 21 on the insulation layer 3 and avoiding slag leakage.

[0084] Alternatively, if Figure 4 , Figure 7 as well as Figure 8 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 be fixedly mounted on the flange 22 by welding, clamping or other fixing methods. In this embodiment, considering the cost and the difficulty of forming, the fixing lug 23 is formed by folding the side of the flange 22 away from the plate body 21, and optionally, the fixing lug 23 is vertically connected to the flange 22 to enhance the structural strength of the fixing frame 2 by using a right-angle structure.

[0085] Optionally, the fixing lug 23 and the frame 1 can be fixed by screws or welding.

[0086] Furthermore, if Figure 7 and Figure 8 The fixing lug 23 is arranged to protrude toward the frame body 1 relative to the flange 22 so that there is a gap between the flange 22 and the frame body 1 .

[0087] In this embodiment, the fixing lug 23 is arranged to protrude toward the frame 1 relative to the flange 22, so that a gap is provided between the flange 22 and the frame 1, so that the fixing frame 2 is not in contact with the frame 1 except for the fixing lug 23 fixedly matched with the frame 1, thereby reducing the contact area between the fixing frame 2 and the frame 1, reducing the heat transfer area, and preventing excessive heat from the combustion chamber fixing bracket from being transferred to the frame 1, resulting in excessive temperature rise when the water supply is cut off.

[0088] As an example, the flange 22 may be set back by 2 mm to 4 mm relative to the corresponding fixing lug 23 .

[0089] In actual application, the number of fixing lugs 23 can be determined according to actual conditions. For example, one fixing lug 23 can be set on each flange 22, or one fixing lug 23 can be set on some flanges 22, and two or more fixing lugs 23 can be set on some flanges 22, and so on. When two or more fixing lugs 23 are set on a flange 22, the two or more fixing lugs 23 can be spaced apart along the length direction of the flange 22, so that the force at the flange 22 is more balanced, ensuring the installation reliability of the fixed bracket. As an example, the flanges 22 at the upper and lower edges of the plate body 21 are respectively provided with two fixing lugs 23, and the two fixing lugs 23 are spaced apart in the horizontal direction; the flange 22 at the side edge of the plate body 21 is provided with a fixing lug 23, and the fixing lug 23 is located in the middle position in the vertical direction.

[0090] In one embodiment of the present application, Figures 1 to 3 as well as Figures 10 to 11 The frame 1 includes a bottom frame 11 and a cover plate 12. The bottom frame 11 includes a back plate 111 and two side plates 112 disposed on opposite sides of the back plate 111. The back plate 111 and the two side plates 112 enclose a cavity with one side open. The cover plate 12 covers the open cavity and is connected to the two side plates 112 to enclose the bottom frame 11 to form a combustion chamber with upper and lower openings.

[0091] The inner wall surfaces of the back plate 111 , the two side plates 112 and the cover plate 12 are all provided with a heat insulation layer 3 , and at least one of the back plate 111 , the two side plates 112 and the cover plate 12 is provided with a convex bump 101 .

[0092] 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 the 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. 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 insulation layer 3, the fixing bracket and other components. Optionally, the cover plate 12 and the bottom frame 11 can be fixed by screws, riveted or other fixing methods.

[0093] The inner wall surfaces of the back plate 111, the two side plates 112 and the cover plate 12 are all provided with a heat insulation layer 3. By providing convex hulls 101 on at least one of the back plate 111, the two side plates 112 and the cover plate 12, the heat insulation layer 3 corresponding to the convex hulls 101 can have a better heat insulation effect. Preferably, convex hulls 101 are provided on the back plate 111, the two side plates 112 and the cover plate 12 to ensure the heat insulation ability of the heat insulation layer 3 on the front, back, left and right four sides of the corresponding combustion chamber, so as to ensure the heat insulation effect of the entire combustion chamber and further improve the effect of reducing the water temperature rise during shutdown.

[0094] In an embodiment of the present application, the heat insulation layer 3 can be made of flexible heat insulation cotton such as silicate fiber, silica fiber or glass fiber. As an example, the flexible heat insulation cotton is made of aluminum silicate fiber cotton with a lower density. The density of the aluminum silicate cotton is less than 0.2 g / cm3, and its density is much lower than that of conventional hard heat insulation materials such as aluminum silicate plates with a density of 0.36 g / cm3. Therefore, 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.

[0095] 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.

[0096] 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, in 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 has a porous structure, 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.

[0097] The present utility model also proposes a gas water heater, such as Figure 12 and Figure 13, the 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 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.

[0098] It can be understood that the type of this gas water heater can be a strongly aspirated water heater. In this case, 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 water heater. In this case, the blower is arranged below the burner 5, and the air flow is driven by blowing air.

[0099] In an embodiment of the present application, as Figure 13 , there is a gap D in the height direction between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5, satisfying: 8mm ≤ D ≤ 12mm.

[0100] It can be understood that the combustion surface of the burner 5 is the flame hole surface of the burner 5. Gas and air are ignited at the combustion surface of the burner 5, and the high-temperature flue gas generated by combustion flows upward under the action of the blower. Therefore, the heat near the combustion surface of the burner 5 is not high, and the heat transferred to the frame 1 in this area is not high either. Thus, the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 can be spaced apart, that is, the frame 1 does not cover the heat insulation layer 3 in a section area near the combustion surface of the burner 5. Therefore, on the premise of having little impact 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 that cooperates with the heat insulation layer 3 can be reduced (the fixing frame 2 covers the heat insulation layer 3 and wraps the bottom of the heat insulation layer 3 to prevent the heat insulation layer 3 from easily falling directly into the combustion chamber after burning and deforming), avoiding the situation that the fixing frame 2 stores too much heat, resulting in too high a stop water temperature rise or too much heat transferred to the frame 1.

[0101] In actual application, the gap D in the height direction between the lower surface of the heat insulation layer 3 and the combustion surface of the burner 5 should not be too large or 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 it is also easy to cause too much heat storage in the fixing frame 2 and too much heat transfer to the frame 1, resulting in too high a stop water temperature rise; if it is too large, the high-temperature flue gas with higher heat is likely to directly contact the frame 1, causing the wall surface of the frame 1 to overheat or the stop water temperature rise to be higher. 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: 8mm ≤ D ≤ 12mm. In this way, both the material cost of the heat insulation layer 3 and the fixing frame 2 can be reduced, and the stop water temperature rise can be lowered.

[0102] 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, 12 mm, etc.

[0103] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A combustion chamber casing, characterized in that: include: A frame, 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 A fixing frame, which is arranged on a side of the heat insulation layer away from the inner wall of the frame and is fixedly connected to the frame to limit the heat insulation layer; Wherein, a portion of the frame corresponding to the combustion chamber is provided with a convex hump protruding in a direction away from the heat insulation layer.

2. The combustion chamber housing according to claim 1, characterized in that There is a gap between the inner wall surface of the convex hull and the heat insulation layer.

3. The combustion chamber housing according to claim 2, characterized in that A plurality of convex points protruding toward the heat insulation layer are arranged on the outer side wall of the convex hump, and the convex points abut against the heat insulation layer.

4. The combustion chamber housing according to claim 3, characterized in that In the normal direction of the inner wall of the frame, the depth of the convex point is not greater than the depth of the convex hull; The projection shape of the convex hull on the outer surface of the frame body is rectangular; and / or the projection shape of the convex point on the outer surface of the frame body is circular.

5. The combustion chamber housing according to any one of claims 1 to 4, characterized in that In the normal direction of the inner wall surface of the frame, the depth dimension d of the convex hull satisfies: 3mm≤d≤5mm.

6. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The fixing frame at least covers the area of ​​the heat insulation layer corresponding to the combustion chamber; The fixing frame comprises: A plate body, which is arranged to cover the surface of the heat insulation layer away from the inner wall of the frame, and the convex bump is arranged opposite to the plate body; 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.

7. 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 inner wall surfaces of the back plate, the two side plates and the cover plate are all provided with the heat insulation layer, and at least one of the back plate, the two side plates and the cover plate is provided with the convex bump.

8. The combustion chamber housing according to any one of claims 1 to 4, characterized in that The thermal insulation layer is a flexible thermal insulation cotton; the flexible thermal insulation cotton is a silicate fiber or a silicon dioxide fiber or a glass fiber; The density of the flexible thermal insulation cotton is less than 0.2g / cm3.

9. 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 8, 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.

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

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