Combustion device and gas water heating apparatus

Abstract

The utility model belongs to gas hot water equipment technical field discloses combustion device and gas hot water equipment, sets up at least two heat insulating plates that distribute in proper order along its circumference in combustion cavity casing, utilizes heat insulating plate to reduce high temperature flue gas transmission to the heat of combustion cavity casing, avoids the temperature of combustion chamber casing to be too high. Two heat insulating plates that distribute along combustion cavity casing circumference adjacent are connected through convex part and mortise and tenon joint, and the transverse positioning of multiple heat insulating plates is supported to heat insulating plate along gravity direction through support structure, and heat insulating plate is fixed in combustion cavity casing, because support structure is integrally formed in combustion cavity casing, and convex part is integrally formed in its heat insulating plate, thus need not to add extra support spare part, be favorable to cooperation heat exchanger and be limited to the upper end of heat insulating plate, thereby realize the final fixation of heat insulating plate, reduce the part quantity of assembling heat insulating plate, simplify the support fixation mode of heat insulating plate, improve the assembly efficiency of combustion device, reduce production cost.

Description

Technical Field

[0001] This utility model relates to the field of hot water equipment technology, and in particular to a combustion device and a gas-fired hot water equipment. Background Technology

[0002] The combustion unit is one of the important components of a gas water heater, requiring the combustion chamber shell to have excellent thermal insulation performance. Current gas water heaters are trending towards miniaturization, typically by reducing the size of the combustion chamber shell to decrease the overall volume of the water heater. This, in turn, places even higher demands on the thermal insulation of the combustion chamber shell.

[0003] To address the aforementioned technical issues, existing technologies propose installing a heat insulation plate on the inner side of each side wall of the combustion chamber shell. These heat insulation plates separate the high-temperature flue gas and flame within the combustion chamber from the combustion chamber shell. Currently, the heat insulation plates are positioned using screws or additional support components, fixing them to the inner wall of the combustion chamber shell. This results in a large number of assembly parts, reducing assembly efficiency and increasing production costs for gas water heaters. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a combustion device that can simplify the support and fixing method of the heat insulation plate while meeting the heat insulation requirements of the combustion chamber shell, thereby improving the assembly efficiency of the combustion device and reducing production costs.

[0005] The second technical problem solved by this utility model is to provide a gas-fired water heater that can simplify the structure of the gas-fired water heater, reduce the cost of the gas-fired water heater, and improve the assembly efficiency of the gas-fired water heater while meeting the insulation requirements of the combustion device.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] Combustion device, including:

[0008] A combustion chamber housing, wherein the combustion chamber housing is integrally formed with a support structure, and the support structure is disposed inside the combustion chamber housing;

[0009] A heat insulation plate is disposed inside the combustion chamber shell. At least two heat insulation plates are provided and are distributed sequentially along the circumference of the combustion chamber shell. The support structure is used to support the heat insulation plate along the direction of gravity. A tenon and mortise interlocking structure is provided between two adjacent heat insulation plates distributed along the circumference of the combustion chamber shell.

[0010] The mortise and tenon joint structure includes protrusions and slots that are respectively provided on different heat insulation boards, and the protrusions are integrally formed on the heat insulation board to which they are located.

[0011] The combustion device described in this utility model has the following advantages compared with the prior art:

[0012] The combustion device provided by this utility model has at least two heat insulation plates arranged sequentially along its circumference inside the combustion chamber shell. These heat insulation plates reduce the heat transferred from the high-temperature flue gas to the combustion chamber shell, thus preventing excessively high temperatures in the combustion chamber shell. Adjacent heat insulation plates distributed along the circumference of the combustion chamber shell are engaged by protrusions and tenon joints to achieve lateral positioning of the multiple heat insulation plates. Furthermore, a support structure supports the heat insulation plates along the direction of gravity, thereby fixing the heat insulation plates inside the combustion chamber shell. Since the support structure is integrally formed into the combustion chamber shell, and the protrusions are integrally formed into the heat insulation plates they are located on, no additional support parts are required. This facilitates the use of a heat exchanger to limit the upper end of the heat insulation plates, achieving final fixation of the heat insulation plates. This reduces the number of parts required for assembling the heat insulation plates, simplifies the support and fixing method, improves the assembly efficiency of the combustion device, and reduces production costs.

[0013] In one embodiment, four heat insulation panels are provided, including two first heat insulation panels arranged opposite each other in the left-right direction and two second heat insulation panels arranged opposite each other in the front-back direction.

[0014] The protrusion includes a first protrusion, and the first protrusion is provided at both the front and rear ends of the first heat insulation plate. The slot includes a first slot, and the first slot is provided at both the left and right ends of the second heat insulation plate. The first protrusion and the first slot are tenon-and-mortise engaged.

[0015] In one embodiment, at least one first protrusion is provided on each of the front and rear end faces of the first heat insulation plate, and the slot includes a second slot. A second slot is formed on both the upper and lower sides of each first protrusion. The protrusion includes a second protrusion. At least two second protrusions are provided on each of the left and right end faces of the second heat insulation plate, which are arranged vertically at intervals. A first slot is formed between two adjacent second protrusions at the same end of the second heat insulation plate. The second protrusions and the second slots are engaged in a one-to-one corresponding engagement.

[0016] In one embodiment, the support structure includes a support flange and a limiting flange, wherein the lower edge of the combustion chamber shell is folded inward to form the support flange, and the inner edge of the support flange is folded upward to form the limiting flange.

[0017] The lower end of the heat insulation plate is supported by the supporting flange and is sandwiched horizontally between the inner wall of the combustion chamber shell and the limiting flange.

[0018] In one embodiment, the combustion chamber housing has four circumferential side plates that are connected end to end and arranged opposite each other in pairs along its circumference;

[0019] The lower edges of the two circumferential side plates arranged opposite each other are connected to the supporting flange, and the lower edges of the other two circumferential side plates arranged opposite each other are connected to the mounting lugs for connecting the burner housing.

[0020] In one embodiment, a cooling channel is formed between the circumferential side plate and the heat insulation plate opposite to it, the cooling channel having an air inlet at the lower part of the circumferential side plate and an air outlet at the upper part of the heat insulation plate.

[0021] In one embodiment, the inner side of the circumferential side plate located on the front side of the combustion chamber housing is recessed towards the outer side of the circumferential side plate, so that the outer side of the circumferential side plate forms an air intake protrusion and the inner side of the circumferential side plate forms a groove structure; along the direction from top to bottom, the groove depth of the groove structure gradually increases, and the air intake hole is opened at the end of the groove structure with the largest groove depth.

[0022] In one embodiment, the inner side of the circumferential side plate located on the front side of the combustion chamber housing is recessed toward the outer side of the circumferential side plate, so that the outer side of the circumferential side plate forms a reinforcing protrusion, and the reinforcing protrusion is arranged at intervals above the air intake protrusion.

[0023] In one embodiment, the heat insulation board is made of aluminum silicate fiberboard; and / or, the combustion chamber shell is made of aluminum-plated plate, galvanized plate or stainless steel plate.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] Gas-fired water heating equipment, including the combustion device provided in any of the above embodiments.

[0026] Compared with the prior art, the gas-fired water heater of this utility model has the following advantages:

[0027] The gas-fired water heater provided by this utility model includes the aforementioned combustion device. At least two heat insulation plates are arranged sequentially along the circumference of the combustion chamber shell. These heat insulation plates reduce the heat transferred from the high-temperature flue gas to the combustion chamber shell, thus preventing excessively high temperatures. Adjacent heat insulation plates distributed circumferentially along the combustion chamber shell are engaged by protrusions and tenon joints to achieve lateral positioning of the multiple heat insulation plates. A support structure supports the heat insulation plates along the direction of gravity, thereby fixing them within the combustion chamber shell. Since the support structure is integrally formed into the combustion chamber shell, and the protrusion is integrally formed into the heat insulation plate it is located on, no additional support parts are required. This facilitates the use of a heat exchanger to limit the upper end of the heat insulation plate, achieving final fixation. This reduces the number of parts required for assembling the heat insulation plates, simplifies the support and fixing method, improves the assembly efficiency of the combustion device, and reduces production costs. Attached Figure Description

[0028] Figure 1 This is a disassembled schematic diagram of the gas-fired water heater provided in an embodiment of the present invention;

[0029] Figure 2 This is a split schematic diagram of the combustion device provided in an embodiment of the present utility model;

[0030] Figure 3 yes Figure 2 A magnified view of a portion of point B in the middle;

[0031] Figure 4 This is a cross-sectional view of the combustion device provided in an embodiment of the present invention;

[0032] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.

[0033] In the picture:

[0034] 1. Combustion chamber shell; 11. U-shaped shell; 111. Outer flange; 12. Front cover plate; 121. Air inlet protrusion; 122. Reinforcing protrusion; 13. Support flange; 14. Limiting flange; 15. Connecting ear plate; 16. Air inlet hole; 17. Circumferential side plate; 18. Mounting ear plate;

[0035] 2. Heat insulation plate; 21. First heat insulation plate; 211. First protrusion; 212. Second slot; 22. Second heat insulation plate; 221. First slot; 222. Second protrusion; 23. Air outlet;

[0036] 10. Cooling channel; 20. Combustion chamber;

[0037] 100. Combustion device; 200. Burner; 300. Heat exchanger; 400. Fan. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0040] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0041] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0042] This utility model provides a combustion device and a gas-fired water heating device including the combustion device. The gas-fired water heating device can be a gas water heater, a wall-mounted boiler, or a heating boiler, etc. The following description uses a gas water heater as an example to illustrate the combustion device. It should be noted that in this utility model embodiment, the side of the gas water heater where the control panel is located is the front side, and the side of the gas water heater facing away from the control panel is the rear side. When the user stands facing the control panel, the user's left and right directions are the left and right directions of the gas water heater, and the height direction is the actual up and down direction.

[0043] like Figure 1As shown, the gas-fired water heater also includes a burner 200 located below the combustion device 100, a heat exchanger 300 located above the combustion device 100, and a fan 400. The inlet of the fan 400 is connected to the outlet of the heat exchanger 300. When the burner 200 and the fan 400 are operating, the high-temperature flue gas generated by the combustion of gas in the combustion device 100 is drawn into the heat exchanger 300 by the fan 400. The heat exchanger 300 absorbs the heat energy from the high-temperature flue gas to raise the temperature of the cold water flowing through the heat exchanger 300. When the gas-fired water heater is used as a gas water heater, it is a forced-draft type gas water heater.

[0044] like Figures 2 to 5 As shown, the combustion device 100 includes a combustion chamber shell 1 and a heat insulation plate 2 disposed within the combustion chamber shell 1. The combustion chamber shell 1 is integrally formed with a support structure, which is disposed within the combustion chamber shell 1 and is used to support the heat insulation plate 2 along the direction of gravity. At least two heat insulation plates 2 are provided and are distributed sequentially along the circumference of the combustion chamber shell 1. A tenon and mortise interlocking structure is provided between two adjacent heat insulation plates 2 distributed along the circumference of the combustion chamber shell 1. The tenon and mortise interlocking structure includes a protrusion and a groove that are tenon and mortise interlocked and respectively disposed on different heat insulation plates 2. The protrusion is integrally formed on the heat insulation plate 2 in which it is located.

[0045] The inner cavity of the combustion chamber shell 1 forms a combustion chamber 20. At least two heat insulation plates 2 are provided in the combustion chamber shell 1 and distributed along its circumference to reduce the heat transferred from the high-temperature flue gas to the combustion chamber shell 1 and prevent the temperature of the combustion chamber shell 1 from becoming too high.

[0046] A tenon-and-mortise joint structure is provided between two adjacent heat insulation plates 2 distributed circumferentially along the combustion chamber shell 1. The protrusions and grooves of the tenon-and-mortise joint structure are used to achieve lateral positioning of the two adjacent heat insulation plates 2 distributed circumferentially along the combustion chamber shell 1. The heat insulation plates 2 are supported by a support structure along the direction of gravity, thereby fixing the heat insulation plates 2 inside the combustion chamber shell 1. Since the support structure is integrally formed into the combustion chamber shell 1 and the protrusion is integrally formed into the heat insulation plate 2 it is located in, there is no need to add additional support parts. This is beneficial for cooperating with the heat exchanger to limit the upper end of the heat insulation plate 2, thereby achieving the final fixation of the heat insulation plate 2. This reduces the number of parts for assembling the heat insulation plate 2, simplifies the support and fixation method of the heat insulation plate 2, improves the assembly efficiency of the combustion device 100, and reduces production costs.

[0047] In some embodiments, four heat insulation plates 2 are provided. The four heat insulation plates 2 include two first heat insulation plates 21 arranged opposite each other in the left-right direction and two second heat insulation plates 22 arranged opposite each other in the front-back direction. The protrusions include first protrusions 211. The first heat insulation plates 21 are provided at both the front and back ends. The slots include first slots 221. The second heat insulation plates 22 are provided at both the left and right ends. The first protrusions 211 and the first slots 221 are tenon-and-mortise engaged.

[0048] The two adjacent heat insulation plates 2 are fixedly connected by tenon and tenon joints of the first protrusion 211 and the first slot 221. Utilizing the inherent structure of the two adjacent heat insulation plates 2, no additional connecting structure is required, simplifying the connection between them. It should be noted that the heat insulation plate 2 can also be configured as two, such as two L-shaped heat insulation plates 2.

[0049] It should be noted that a first protrusion can also be provided at one end of the first heat insulation plate 21 in the front-rear direction, and a first slot can be provided at the other end. Correspondingly, a first slot that engages with the first protrusion can be provided on one of the second heat insulation plates 22 adjacent to the first heat insulation plate 21, and a first protrusion that engages with the first slot can be provided on the other second heat insulation plate 22 adjacent to the first heat insulation plate 21. Alternatively, the two first heat insulation plates 21 can be arranged opposite each other in the front-rear direction, and the two second heat insulation plates 22 can be arranged opposite each other in the left-right direction.

[0050] More specifically, the front and rear end faces of the first heat insulation plate 21 are each provided with at least one first protrusion 211, the slot includes a second slot 212, and the upper and lower sides of each first protrusion 211 are provided with a second slot 212. The protrusion includes a second protrusion 222. The left and right end faces of the second heat insulation plate 22 are each provided with at least two second protrusions 222 arranged vertically and horizontally. The first slot 221 is formed between two adjacent second protrusions 222 located at the same end of the second heat insulation plate 22. The second protrusions 222 and the second slots 212 are engaged in a one-to-one correspondence.

[0051] By engaging the first protrusion 211 and the first slot 221 in a one-to-one manner, and by engaging the second protrusion 222 and the second slot 212 in a one-to-one manner, the connection stability between two adjacent heat insulation plates 2 can be improved.

[0052] For example, the first protrusion 211 and the second protrusion 222 are both rectangular blocks, the first slot 221 is a rectangular slot that runs through the front and back direction, and the second slot 212 is a rectangular slot that runs through the left and right direction.

[0053] As an alternative, the first protrusion 211 is not limited to a rectangular block, but can also be a dovetail block, and correspondingly the first slot 221 is a dovetail slot. The number of the first protrusion 211 is not limited to one, but can be two or more, with the first protrusion 211 and the first slot 221 corresponding one-to-one, and the number of the second protrusion 222 is adaptively set according to the number of the first protrusion 211.

[0054] As an alternative, the first slot 221 is not limited to being provided on the left and right end faces of the second heat insulation plate 22. The first slot 221 can also be a plug hole provided on the second heat insulation plate 22, in which the first protrusion 211 is inserted into the plug hole on the second heat insulation plate 22 with an interference fit in the front-back direction. Alternatively, at least one end of the plug hole can be extended to the end face of the second heat insulation plate 22 in the vertical direction. This plug hole is a dovetail groove, in which the first protrusion 211 is inserted into the plug hole with an interference fit in the vertical direction.

[0055] In some embodiments, the support structure includes a support flange 13 and a limiting flange 14. The lower edge of the combustion chamber shell 1 is folded inward to form the support flange 13, and the inner edge of the support flange 13 is folded upward to form the limiting flange 14. The combustion chamber shell 1 has four circumferential side plates 17 that are connected end to end along its circumference and arranged opposite to each other in pairs. The heat insulation plate 2 is arranged in a one-to-one correspondence with the circumferential side plates 17. The heat insulation plate 2 is located inside the corresponding circumferential side plate 17. The lower ends of at least two oppositely arranged heat insulation plates 2 are supported by the support flange 13 and sandwiched between the corresponding circumferential side plate 17 and the limiting flange 14 in the horizontal direction.

[0056] When installing the heat insulation plate 2 into the combustion chamber shell 1, first connect any two adjacent heat insulation plates 2 of the four heat insulation plates 2 with a tenon and mortise snap-fit ​​structure to form a heat insulation structure. Then, insert the heat insulation structure downward into the combustion chamber shell 1 through the top opening of the combustion chamber shell 1, and insert the lower end of the heat insulation plate 2 between the support flange 13 and the limiting flange 14 connected to the support flange 13 until it can no longer move downward, indicating that the heat insulation structure is installed in place. At this time, the lower end of the heat insulation plate 2 is clamped horizontally between the support flange 13 and the limiting flange 14 connected to the support flange 13, thus completing the installation of the heat insulation structure. The installation of the heat insulation structure is convenient and quick.

[0057] As an alternative, the support structure can also be a boss integrally formed on the inner wall of the circumferential side plate 17. The boss is inserted into the insertion hole on the first heat insulation plate 21 in a horizontal direction. A limiting surface is provided on the boss, so that the first heat insulation plate 21 is pressed against the limiting surface in a horizontal direction close to the circumferential side plate 17. A first slot is provided on the first heat insulation plate 21, and the upper end of the first slot extends to the upper end surface of the first heat insulation plate 21. A first protrusion is provided on the second heat insulation plate 22, and the first protrusion is inserted into the first slot from top to bottom. The second heat insulation plate 22 is supported by the inner wall of the slot with the first slot facing upward, so as to achieve support and limiting of the heat insulation plate in the vertical direction.

[0058] In some embodiments, the lower edges of two opposing circumferential side plates 17 are connected to support flanges 13, and the lower edges of the other two opposing circumferential side plates 17 are connected to mounting lugs 18 for connecting to the housing of the burner 200. Exemplarily, the lower edges of the two circumferential side plates 17 distributed in the left-right direction are each connected to a support flange 13, and the lower edges of the two circumferential side plates 17 distributed in the front-back direction are each connected to a mounting lug 18. The mounting lugs 18 are connected to the housing of the burner 200 by fasteners.

[0059] Specifically, the combustion chamber housing 1 includes a U-shaped housing 11 with its opening facing forward, and a front cover plate 12 connected to the U-shaped housing 11. The front cover plate 12 blocks the opening on the front side of the U-shaped housing 11, and a supporting flange 13 is connected to the lower edge of the front cover plate 12. The lower edges of the side walls of the U-shaped housing 11 and the front cover plate 12, which are arranged opposite to each other, are also connected to the supporting flange 13. Exemplarily, the combustion chamber housing 1 is a rectangular box structure, and correspondingly, the horizontal cross-section of the combustion chamber 20 is rectangular.

[0060] The installation requirements of each heat insulation board 2 can be met by connecting the support flange 13 to the lower edge of the two circumferential side plates 17 distributed in the left and right directions. Compared with connecting the support flange 13 to the lower edge of each circumferential side plate 17, this is beneficial to reduce processing costs.

[0061] It should be noted that, ignoring cost, support flanges 13 can be connected to the lower edge of each circumferential side plate 17.

[0062] In some embodiments, such as Figure 2 As shown, the front edges of the opposite side walls of the U-shaped housing 11 are folded outward to form outward flanges 111, which are connected to the front cover plate 12 by fasteners. The connection between the front cover plate 12 and the U-shaped housing 11 is simple and low-cost. For example, the U-shaped housing 11 is a one-piece molded structural component, which simplifies the processing of the U-shaped housing 11, reduces processing costs, and increases processing efficiency.

[0063] In some embodiments, the insulation board 2 is made of aluminum silicate fiberboard, which has a low thermal conductivity, good insulation effect, and low heat loss. This improves the energy concentration effect of the combustion chamber shell 1 and enhances the thermal efficiency of the gas water heater. Consequently, it eliminates the need to send more cold air into the cooling channel 10. With the air intake volume remaining constant, more air can be directly sent into the combustion chamber 20 inside the combustion chamber shell 1 to participate in combustion, resulting in more complete combustion of the gas. This allows for a reduction in fan speed by 400 rpm while ensuring emissions meet requirements, thereby achieving noise reduction. Furthermore, due to the low density of aluminum silicate fiberboard, it is thicker than ordinary metal plates for the same weight, resulting in better sound absorption and reducing the noise of the gas water heater. In addition, the insulation board 2 is a non-metallic plate, which effectively avoids the abnormal noise caused by the thermal expansion and contraction of metal plates during startup.

[0064] It should be noted that the heat insulation board 2 can also be a high-temperature and high-pressure heat insulation board made of high-temperature and high-pressure resistant resin, alkali-free fiberglass cloth and composite reinforcing materials through molding and lamination, or asbestos board, or foam board, etc.

[0065] In some embodiments, the combustion chamber housing 1 is made of aluminized sheet, which has good heat reflectivity and high heat insulation performance. As an alternative, the combustion chamber housing 1 can also be made of other sheets with good heat reflectivity and high heat insulation performance, such as galvanized sheet or stainless steel sheet.

[0066] In some embodiments, such as Figure 4 and Figure 5 As shown, a cooling channel 10 is formed between the circumferential side plate 17 and the corresponding heat insulation plate 2. The cooling channel 10 has an air inlet 16 opened at the lower part of the circumferential side plate 17 and an air outlet 23 opened at the upper part of the heat insulation plate 2.

[0067] External air enters the cooling channel 10 through the air inlet 16, then flows upward to the vicinity of the air outlet 23, and enters the combustion chamber 20 inside the heat insulation plate 2 through the air outlet 23. The air flowing in the cooling channel 10 cools the heat insulation plate 2 and the circumferential side plate 17 to prevent them from overheating. In addition, the air in the cooling channel 10 enters the combustion chamber 20 inside the heat insulation plate 2 through the air outlet 23 to participate in combustion, thereby supplying air to the combustion chamber 20 inside the heat insulation plate 2 and enabling more complete combustion of the fuel gas.

[0068] In some embodiments, such as Figure 2 As shown, the total cross-sectional area of ​​the air outlets 23 on the heat insulation plate 2 is S1, and the total cross-sectional area of ​​the air inlets 16 on the circumferential side plate 17 corresponding to the heat insulation plate 2 is S2; 2S2<S1<4S2, so as to satisfy the cooling effect on the combustion chamber shell 1.

[0069] It should be noted that the cross-sectional area of ​​the air outlet 23 refers to the projected area of ​​the air outlet 23 on a plane perpendicular to the axial direction of the air outlet 23; when one air outlet 23 is provided, the total cross-sectional area of ​​the air outlets 23 opened on the heat insulation plate 2 is the projected area corresponding to that air outlet 23. The cross-sectional area of ​​the air inlet 16 refers to the projected area of ​​the air inlet 16 on a plane perpendicular to the axial direction of the air inlet 16, and the total cross-sectional area of ​​the air inlets 16 opened on the circumferential side plate 17 refers to the sum of the projected areas corresponding to the multiple air inlets 16 opened on the circumferential side plate 17.

[0070] S1 can be any value between 2S2 and 4S2, such as any one of 2.1S2, 2.2S2, 2.3S2, 2.4S2, 2.5S2, 2.6S2, 2.7S2, 2.8S2, 2.9S2, 3S2, 3.1S2, 3.2S2, 3.3S2, 3.4S2, 3.5S2, 3.6S2, 3.7S2, 3.8S2, or 3.9S2. For example, S1 = 3S2.

[0071] For example, the air inlet 16 on the front circumferential side plate 17 is a rectangular hole; in other words, the air inlet 16 on the front cover plate 12 is a rectangular hole. The air inlet 16 on other circumferential side plates 17 is a round hole; in other words, the air inlet 16 on the U-shaped shell 11 is a round hole. Each circumferential side plate 17 is provided with multiple air inlets 16. Multiple air inlets 16 are arranged at intervals along the left and right directions on circumferential side plates 17 arranged at intervals along the front and back directions, and multiple air inlets 16 are arranged at intervals along the front and back directions on circumferential side plates 17 arranged at intervals along the front and back directions. Each heat insulation plate 2 is provided with an elongated air outlet 23. The elongated outlet 23 on the heat insulation plates 2 arranged at intervals along the front and back directions extends along the front and back directions, and the elongated outlet 2 on the heat insulation plates 2 arranged at intervals along the left and right directions extends along the left and right directions.

[0072] In some embodiments, such as Figure 1 and Figure 2 As shown, the inner side of the circumferential side plate 17 located on the front side of the combustion chamber shell 1 is recessed towards the outer side of the circumferential side plate 17, so that the outer side of the circumferential side plate 17 forms an air inlet protrusion 121, and the inner side of the circumferential side plate 17 forms a groove structure; along the direction from top to bottom, the groove depth of the groove structure gradually increases, and the air inlet hole 16 is opened at the end of the groove structure with the largest groove depth.

[0073] With the above configuration, the air entering the cooling channel 10 through the air inlet 16 can flow upward under the guidance of the groove structure. The groove structure guides the air, so that the external air enters the cooling channel 10 from bottom to top when passing through the air inlet 16. This not only reduces the air intake resistance, but also prevents the air entering the cooling channel 10 through the air inlet 16 from directly impacting the heat insulation plate 2, which helps to reduce the vibration of the combustion device 100 and reduce the air intake noise.

[0074] By stamping the raw material, an air inlet protrusion 121 is formed on the outer side of the front cover plate 12, and a groove structure is formed on the inner side of the front cover plate 12, which can also improve the structural strength of the front cover plate 12; moreover, the air inlet protrusion 121 is arranged on the outer side of the front cover plate 12, which can improve the aesthetic performance of the front cover plate 12.

[0075] For example, an air inlet protrusion 121 is provided only on the front cover plate 12. It should be noted that, if the installation space allows, the air inlet protrusion 121 can also be arranged on the U-shaped housing 11, and the air inlet hole 16 on the U-shaped housing 11 can be arranged on the air inlet protrusion 121 on the U-shaped housing 11.

[0076] In some embodiments, such as Figure 2 As shown, the inner side of the circumferential side plate 17 located on the front side of the combustion chamber housing 1 is recessed towards the outer side of the circumferential side plate 17, so that the outer side of the circumferential side plate 17 forms a reinforcing protrusion 122. In other words, the reinforcing protrusion 122 is arranged on the front cover plate 12, and the reinforcing protrusion 122 is arranged at intervals above the air intake protrusion 121.

[0077] For example, the front cover plate 12 is provided with a reinforcing protrusion 122. By stamping the raw material of the front cover plate 12, the reinforcing protrusion 122 is formed on the outer side of the front cover plate 12, while a groove structure is formed on the inner side of the front cover plate 12, which is beneficial to improving the structural strength of the front cover plate 12.

[0078] For example, the height of the raised bump 122 gradually increases from bottom to top, which, together with the air inlet bump 121 arranged on the outer side of the front cover 12, helps to improve the aesthetic performance of the front cover 12, thereby improving the appearance performance of the gas water heater.

[0079] In some embodiments, such as Figure 2 As shown, a connecting lug 15 is connected to the upper edge of the combustion chamber shell 1, and the heat exchange shell of the heat exchanger 300 is connected to the connecting lug 15 by fasteners. Exemplarily, a connecting lug 15 is connected to the upper edge of each circumferential side plate 17 to improve the connection stability between the heat exchange shell and the combustion chamber shell 1.

[0080] In some embodiments, the thickness of the heat insulation board 2 is greater than 10 mm and less than or equal to 20 mm. The thicker the heat insulation board 2, the better its heat insulation and noise reduction effects, but the corresponding cost and space occupation are also greater. By limiting the thickness of the heat insulation board 2 to greater than or equal to 10 mm and less than or equal to 20 mm, the thickness of the heat insulation board 2 can be selected according to actual space requirements and cost while ensuring noise reduction and heat insulation effects.

[0081] It should be noted that the thickness of the heat insulation plate 2 can be any value greater than or equal to 10 mm and less than or equal to 20 mm. Specifically, the thickness of the heat insulation plate 2 can be determined according to the dimensions of the combustion chamber shell 1 and the dimensions of the cooling channel 10, such as any size selected from 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, and 20 mm. For example, the thickness of the heat insulation plate 2 is 10 mm.

[0082] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0083] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A combustion device, characterized in that, include: Combustion chamber housing (1), wherein the combustion chamber housing (1) is integrally formed with a support structure, wherein the support structure is disposed inside the combustion chamber housing (1); A heat insulation plate (2) is provided inside the combustion chamber shell (1). At least two heat insulation plates (2) are provided and are distributed sequentially along the circumference of the combustion chamber shell (1). The support structure is used to support the heat insulation plate (2) along the direction of gravity. A tenon and mortise interlocking structure is provided between two adjacent heat insulation plates (2) distributed along the circumference of the combustion chamber shell (1). The tenon and mortise interlocking structure includes protrusions and slots that are tenon and mortise interlocked and respectively disposed on different heat insulation plates (2), wherein the protrusions are integrally formed on the heat insulation plate (2) to which they are located.

2. The combustion device according to claim 1, characterized in that, The heat insulation board (2) is provided in four parts, including two first heat insulation boards (21) arranged opposite each other in the left-right direction and two second heat insulation boards (22) arranged opposite each other in the front-back direction. The protrusion includes a first protrusion (211), and the first protrusion (211) is provided at both the front and rear ends of the first heat insulation plate (21). The slot includes a first slot (221), and the first slot (221) is provided at both the left and right ends of the second heat insulation plate (22). The first protrusion (211) and the first slot (221) are tenon-and-mortise engaged.

3. The combustion device according to claim 2, characterized in that, The first heat insulation plate (21) has at least one first protrusion (211) on each of its front and rear ends. The slot includes a second slot (212). The upper and lower sides of each first protrusion (211) are provided with a second slot (212). The protrusion includes a second protrusion (222). The left and right ends of the second heat insulation plate (22) are provided with at least two second protrusions (222) arranged vertically and horizontally. The first slot (221) is formed between two adjacent second protrusions (222) at the same end of the second heat insulation plate (22). The second protrusion (222) and the second slot (212) are engaged in a one-to-one correspondence.

4. The combustion device according to any one of claims 1 to 3, characterized in that, The support structure includes a support flange (13) and a limiting flange (14). The lower edge of the combustion chamber shell (1) is folded inward to form the support flange (13), and the inner edge of the support flange (13) is folded upward to form the limiting flange (14). The lower end of the heat insulation plate (2) is supported by the supporting flange (13) and is sandwiched horizontally between the inner wall of the combustion chamber shell (1) and the limiting flange (14).

5. The combustion device according to claim 4, characterized in that, The combustion chamber shell (1) has four circumferential side plates (17) that are connected end to end along its circumference and arranged opposite to each other in pairs. The lower edges of the two circumferential side plates (17) arranged opposite to each other are connected to the support flange (13), and the lower edges of the other two circumferential side plates (17) arranged opposite to each other are connected to the mounting ear plate (18) for connecting the housing of the burner (200).

6. The combustion device according to claim 5, characterized in that, A cooling channel (10) is formed between the circumferential side plate (17) and the heat insulation plate (2) opposite thereto. The cooling channel (10) has an air inlet (16) opened at the lower part of the circumferential side plate (17) and an air outlet (23) opened at the upper part of the heat insulation plate (2).

7. The combustion device according to claim 6, characterized in that, The inner side of the circumferential side plate (17) located on the front side of the combustion chamber shell (1) is recessed towards the outer side of the circumferential side plate (17), so that the outer side of the circumferential side plate (17) forms an air inlet protrusion (121), and the inner side of the circumferential side plate (17) forms a groove structure; along the direction from top to bottom, the groove depth of the groove structure gradually increases, and the air inlet hole (16) is opened at the end of the groove structure with the largest groove depth.

8. The combustion device according to claim 7, characterized in that, The inner side of the circumferential side plate (17) located on the front side of the combustion chamber housing (1) is recessed towards the outer side of the circumferential side plate (17), so that the outer side of the circumferential side plate (17) forms a reinforcing protrusion (122), and the reinforcing protrusion (122) is arranged at intervals above the air intake protrusion (121).

9. The combustion device according to any one of claims 1 to 3, characterized in that, The heat insulation board (2) is made of aluminum silicate fiberboard; and / or the combustion chamber shell (1) is made of aluminum plate, zinc plate or stainless steel plate.

10. A gas-fired hot water equipment, characterized in that, Includes the combustion device (100) according to any one of claims 1 to 9.

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