Gas water heating device

Abstract

The present invention discloses a gas water heating device. The gas water heating device includes a combustion device, a heat exchanger and a blower which are arranged in sequence from bottom to top. The combustion device includes a frame body and a burner. The burner is used for mixing gas and air and then burning. The burner includes a plurality of fire rows arranged in parallel. An air passage part is formed between the burner and the frame body. A heat insulation plate is arranged in the frame body at a predetermined distance from the inner wall of the frame body. The heat insulation plate has opposite first surface and second surface. The second surface is arranged opposite to the inner wall of the frame body. An air inlet part is arranged on the frame body. The air flowing in from the air passage part can flow through at least part of the first surface. The gas water heating device provided by the present application can ensure that the temperatures of both the heat insulation plate and the frame body of the combustion device can be effectively controlled, thereby ensuring the reliability of the whole machine operation and improving the user experience.

Description

[0001] This application is a divisional application of the application with the application number "201810513073.9", the application date of "May 25, 2018", and the invention title of "Gas Water Heating Device". Technical Field

[0002] The present invention relates to the field of gas appliances, and particularly to a gas water heating device. Background Art

[0003] A gas water heating device usually uses gas as fuel, and through a combustion heating method, transfers energy to the cold water flowing through a heat exchanger to achieve the purpose of preparing hot water, which is a type of gas appliance. Specific forms of the gas water heating device include a wall-mounted boiler, a gas water heater, etc.

[0004] Generally, a gas water heating device mainly includes: a housing, a combustion device that burns fuel gas to generate high-temperature heat energy, a heat exchanger for circulating water to be heated, a fan for providing air flow power, and other components. Among them, a burner is provided in the combustion device, which generates high-temperature heat energy during operation, thereby forming a high-temperature area in a predetermined space above the combustion surface of the burner. In order to prevent the high-temperature heat energy from being transferred to the electronic components and the housing around the high-temperature area, a corresponding cooling structure is usually provided around the frame of the high-temperature area around the burner.

[0005] In the prior art, for example, Chinese Utility Model Patent CN206944451U discloses a gas water heating device, which sets a heat insulation plate inside the surrounding frame and an air inlet part on the surrounding frame. When the fan operates, the air outside the surrounding frame can flow into the space between the surrounding frame and the heat insulation plate through the air inlet part, thereby cooling the surrounding frame.

[0006] However, the applicant further found through research that: although the temperature of the surrounding frame is effectively controlled by setting the above-mentioned cooling structure, the local temperature of the heat insulation plate is too high. When the local temperature of the heat insulation plate is too high, local deformation may occur, causing the heat insulation plate to be scrapped prematurely, which will affect the reliability of the whole machine operation and reduce the user experience.

[0007] In summary, it is necessary to further optimize and improve the existing gas water heating device to ensure that the temperatures of the heat insulation plate and the frame located in the high-temperature area can be effectively controlled within a predetermined range, thereby ensuring the reliability of the whole machine operation and improving the user experience. Summary of the Invention

[0008] The purpose of the present invention is to provide a gas water heating device with an optimized cooling structure, which can overcome the defects in the prior art, ensure that the temperatures of the heat insulation plate and the frame of the combustion device can be effectively controlled, thereby ensuring the reliability of the whole machine operation and improving the user experience.

[0009] The above-mentioned purpose of the present invention can be achieved by adopting the following technical solutions:

[0010] A gas water heater, comprising a combustion device, a heat exchanger and a fan arranged in sequence from bottom to top, wherein the combustion device comprises a frame and a burner at least partially arranged in the frame and close to an end of the frame away from the heat exchanger, and an air passage portion is formed between the burner and at least part of the frame;

[0011] A heat insulation board is arranged in the frame at a predetermined distance from the inner wall of the frame, and an air inlet is arranged on the frame;

[0012] When the fan is started, the air entering from the air inlet portion flows into between the heat insulation board and the frame, and at least a portion of the air entering from the air passing portion flows toward the heat insulation board.

[0013] Furthermore, the fan is a variable frequency fan.

[0014] Furthermore, the heat insulation board has a first surface and a second surface opposite to each other; the second surface is arranged opposite to the inner wall of the frame;

[0015] When the fan is started, the air flowing in from the air passing portion can flow through at least a portion of the first surface, and the air flowing in between the heat insulation board and the frame can flow through at least a portion of the second surface.

[0016] Furthermore, the heat insulation board has an upper end and a lower end opposite to each other, and the lower end of the heat insulation board is connected to the inner wall of the frame body in a sealed manner.

[0017] Furthermore, the lower end of the heat insulation plate is close to the combustion surface of the burner, the upper end of the heat insulation plate is close to the heat exchanger, and the height distance from the air inlet to the combustion surface is greater than 5 cm.

[0018] Furthermore, the side edge of the heat insulation board is connected to the inner wall of the frame body by a sealing connection.

[0019] Furthermore, the sealing connection is carried out in such a manner that a bending portion is provided at the lower end and the side of the heat insulation board, the bending portion has an end portion facing away from the heat insulation board, and the end portion is in contact with the inner wall of the frame.

[0020] Furthermore, the frame body includes a first side wall and a second side wall that are opposite to each other and a third side wall and a fourth side wall that are opposite to each other, and each side wall is correspondingly provided with the heat insulation board.

[0021] Further, the first side wall of the frame body is an installation side wall, and the second side wall, the third side wall and the fourth side wall are of an integral structure, and the heat insulation plates corresponding to the second side wall, the third side wall and the fourth side wall are also of an integral structure.

[0022] Further, the first side wall is an installation side wall, a limiting plate is arranged between the second side wall and the burner, and a diversion part for air circulation is formed on the limiting plate.

[0023] Further, the heat insulation plate has opposite upper and lower ends, a step part is arranged at a position close to the upper end of the heat insulation plate, and at least one opening groove is arranged on the step part, and the air flowing into the space between the heat insulation plate and the frame body can flow out from the opening groove.

[0024] Further, the distance from the step part to the upper end of the heat insulation plate is less than 10 cm.

[0025] Further, at least part of the heat insulation plate between the step part and the upper end fits with the inner wall of the frame body.

[0026] Further, a diversion component is arranged between the heat insulation plate and the inner wall of the frame body, and the diversion component and the heat insulation plate and the frame body cooperate to form a predetermined sealed flow channel, and the gas flows in from the air inlet part and flows through the sealed flow channel in a predetermined flow direction and then flows out from the opening groove.

[0027] Further, the heat insulation plate has opposite upper and lower ends and opposite left and right ends, and the lower end and the left and right ends of the heat insulation plate respectively fit with the inner wall of the frame body from the lower end to a predetermined height, wherein the predetermined height is not less than the distance from the lower end of the heat insulation plate to the air inlet part.

[0028] Further, the air inlet part is a plurality of air inlet holes opened at a predetermined height of the side wall of the frame body, and the predetermined height is located in the upper middle part of the height area where the side wall of the frame body opposite to the heat insulation plate is located.

[0029] Further, the air inlet holes are arranged circumferentially along the side wall of the frame body, and the circumferentially arranged air inlet holes are at least distributed in two rows along the height direction.

[0030] A gas water heating device, the gas water heating device includes a combustion device, a heat exchanger and a blower arranged in sequence from bottom to top, the combustion device includes a frame body and a burner at least partially arranged in the frame body and close to one end of the frame body away from the heat exchanger, wherein, an air passing part is formed between the burner and at least part of the frame body;

[0031] A heat insulation board is arranged in the frame at a predetermined distance from the inner wall of the frame, and an air inlet is arranged on the frame;

[0032] When the fan is started, the air flowing in from the air passing portion flows to the first area of ​​the heat insulation board, and the air flowing in from the air inlet portion between the heat insulation board and the frame body flows to the second area of ​​the heat insulation board.

[0033] Furthermore, the fan is a variable frequency fan.

[0034] Furthermore, the first region includes: a region where the heat insulation board is located below the height of the air intake portion, and the second region includes: a region where the heat insulation board is located above the height of the air intake portion, and the first region and the second region at least intersect to cover the entire heat insulation board.

[0035] Furthermore, the heat insulation board has an upper end and a lower end opposite to each other, and the lower end of the heat insulation board is connected to the inner wall of the frame body in a sealed manner.

[0036] Furthermore, the lower end of the heat insulation plate is close to the combustion surface of the burner, the upper end of the heat insulation plate is close to the heat exchanger, and the height distance from the air inlet to the combustion surface is greater than 5 cm.

[0037] Furthermore, the side edge of the heat insulation board is connected to the inner wall of the frame body by a sealing connection.

[0038] Furthermore, the insulation board has an upper end and a lower end relative to each other, and a step portion is provided on the insulation board near the upper end. The step portion is provided with at least one open groove, and air flowing into between the insulation board and the frame can flow out from the open groove.

[0039] It can be seen from the technical solution provided by the above embodiment of the present application that an air inlet is provided on the frame provided with the heat insulation board, and an air passing portion is formed between the burner and at least part of the frame. When the fan is started, the air entering from the air inlet flows into the space between the heat insulation board and the frame to form a first cooling airflow, and at least part of the air flowing in from the air passing portion flows to the heat insulation board to form a second cooling airflow. Under the cooperation of the above two airflows, the temperatures of the heat insulation board and the frame are effectively controlled. In particular, for the heat insulation board, since the air introduced by the air passing portion can cool the lower part of the heat insulation board, the position of the air inlet can be adjusted upward. Compared with the existing cooling structure, the air flow can be greatly shortened, so that the air with a lower temperature can be centrally heat-exchanged with the area with a higher temperature on the upper part of the heat insulation board, ensuring that the temperature of the entire heat insulation board is effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic structural diagram of a gas water heating device provided by an embodiment of the present application;

[0041] Figure 2 It is a front view of a combustion device in the gas water heating device provided by an embodiment of the present application;

[0042] Figure 3 It is a top view of a combustion device in the gas water heating device provided by an embodiment of the present application;

[0043] Figure 4 It is a sectional view of a combustion device in the gas water heating device provided by an embodiment of the present application;

[0044] Figure 5 It is a partial sectional view of the mating part of the combustion device and the heat insulation plate in the gas water heating device provided by an embodiment of the present application;

[0045] Figure 6 It is a schematic structural diagram of the heat insulation plate in the gas water heating device provided by an embodiment of the present application.

[0046] Explanation of reference numerals:

[0047] 1 - Combustion device; 10 - Intake part; 11 - Frame body; 110 - Intake port; 12 - Burner; 2 - Heat insulation plate; 20 - Open slot; 21 - Step part; 3 - Heat exchanger; 31 - Water inlet pipe; 32 - Water outlet pipe; 4 - Fan; 5 - Air passage part; 111 - First side wall; 112 - Second side wall; 113 - Third side wall; 114 - Fourth side wall; 6 - Limiting plate. Detailed implementation manners

[0048] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. After reading the present invention, various equivalent modifications made by those skilled in the art fall within the scope defined by the appended claims of the present application.

[0049] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation manners.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the related listed items.

[0051] In the prior art, after the fan is started, the cold air entering from the air inlet of the first enclosure gradually moves upward after flowing between the heat insulation plate and the first enclosure. During the upward movement, the air with a lower temperature exchanges heat with the first enclosure and the heat insulation plate. During the heat exchange process, the temperature of the air gradually rises. When it reaches the upper end of the first enclosure, due to the relatively long entire process, on the one hand, the air is heated to a relatively high temperature, and on the other hand, it is prone to divergence after reaching the high-temperature area. Therefore, it is impossible to achieve a good cooling effect on the first enclosure or the heat insulation plate. For the entire combustion chamber, the position with the highest temperature is near the upper end of the first enclosure, which results in the upper part of the heat insulation plate always being in a high-temperature environment during use. When the upper part of the heat insulation plate is in a high-temperature environment for a long time, local deformation is likely to occur, causing the heat insulation plate to be scrapped prematurely, which will affect the reliability of the operation of the whole machine and reduce the user experience.

[0052] The present invention provides a gas water heating device, which can overcome the defects in the prior art, ensure that the temperatures of the heat insulation plate and the combustion device frame located in the high-temperature area can be effectively controlled within a predetermined range, thereby ensuring the reliability of the operation of the whole machine and improving the user experience.

[0053] In the prior art, the air supply methods of gas water heating devices include the blowing type and the exhaust type. Among them, for the blowing-type gas water heating device, the fan is generally installed below the burner, and the fan, the burner, and the heat exchanger are arranged in sequence from bottom to top. A positive pressure is formed in the combustion chamber of the gas water heating device, and there cannot be an opening on this combustion chamber, otherwise the flame will come out through this opening and directly increase the temperature of the components and the shell around the combustion chamber.

[0054] In this application, the air supply method adopted by the gas water heating device is the exhaust type. For example, it can be the upper exhaust type. When the gas water heating device adopts the upper exhaust type, the combustion device, the heat exchanger, and the fan are arranged in sequence from bottom to top. When the gas water heating device adopts the exhaust air supply method, a negative pressure is formed inside the gas water heating device, that is, the internal pressure of the gas water heating device is less than the external pressure. Therefore, it will not cause the flame to overflow, and it is reliable and safe to use.

[0055] Please refer to Figures 1 to 5, a gas water heating device provided in an embodiment of the present application may include: a combustion device 1, a heat exchanger 3, and a blower 4 arranged in sequence from bottom to top. Among them, the combustion device 1 includes a frame body 11 and a burner 12 at least partially arranged inside the frame body 11 and close to one end of the frame body away from the heat exchanger 3. An air passage portion 5 is formed between the burner 12 and at least a part of the frame body 11; a heat insulation plate 2 is arranged in the frame body 11 at a predetermined distance from the inner wall of the frame body 11, and an air inlet portion 10 is provided on the frame body 11; when the blower 4 is started, the air entering from the air inlet portion 10 flows into the space between the heat insulation plate 2 and the frame body 11, and at least a part of the air flowing in from the air passage portion 5 flows towards the heat insulation plate 2.

[0056] The gas water heating device provided in the present application may specifically adopt an upward-draft form. When the gas water heating device is in an upward-draft form, the combustion device 1, the heat exchanger 3, and the blower 4 are arranged in sequence from bottom to top. In the following embodiments, the upward-draft gas water heating device is mainly taken as an example for illustration. The downward-draft gas water heating device can be analogously referred to the upward-draft gas water heating device, and the present application will not elaborate herein.

[0057] In this embodiment, the blower 4 is used to provide the driving force for the air flow. Specifically, the structure, installation position, and installation method of the blower 4 itself may vary according to different actual usage scenarios, and the present application does not make specific limitations herein.

[0058] In this embodiment, the heat exchanger 3 is used for circulating the water to be heated. Specifically, the heat exchanger 3 may be in the form of heat exchange tubes, one end of which is connected to the water inlet pipe 31, and the other end is connected to the water outlet pipe 32. Of course, the shape, structure, etc. of the heat exchanger 3 may vary according to different actual usage scenarios, and the present application does not make specific limitations herein.

[0059] In this embodiment, the combustion device 1 may include a burner 12 and a frame body 11. Among them, the burner 12 is used to mix and burn gas and air. After ignition, the high-temperature flue gas generated by the mixed combustion of gas and air can be used to heat the water flow in the heat exchanger 3. Specifically, the burner 12 may include a plurality of fire rows arranged in parallel, and the plurality of fire rows can be installed on the mounting seat. Of course, the structure, form, etc. of the burner 12 may vary according to different actual usage scenarios, and the present application does not make specific limitations herein.

[0060] The housing 11 is used to form a combustion chamber. Specifically, the housing 11 can be an overall frame with openings at both ends, and a burner 12 is provided at one end thereof away from the heat exchanger 3. The burner 12 can be entirely arranged inside the housing 11 or partially arranged inside the housing 11, and the present application does not make specific limitations here.

[0061] A heat insulation plate 2 is arranged in the housing 11, and the heat insulation plate 2 is arranged at a predetermined distance from the inner wall of the housing 11. On the one hand, the heat insulation plate 2 is used to isolate the high-temperature heat energy in the combustion area from the housing 11, and on the other hand, it is used to cooperate with the housing 11 to form a flow channel through which air can flow. Specifically, the heat insulation plate 2 can be a thin plate made of high-temperature resistant material, and there is a predetermined distance between it and the housing 11. The predetermined distance is used to ensure that there is a gap between the heat insulation plate 2 and the housing 11. Specifically, the size of the predetermined distance is not specifically limited in the present application.

[0062] An air inlet part 10 is arranged at a predetermined position on the housing 11. When the fan 4 is started, external air can flow into the flow channel formed between the heat insulation plate 2 and the housing 11 through the air inlet part 10. An air passage part 5 is formed between the burner 12 and at least part of the housing 11. External air can enter through the air passage part 5 and at least partially flow towards the heat insulation plate 2. Specifically, the air passage part 5 can be formed by the gap between the burner 12 and the housing 11. Of course, the air passage part 5 can also be formed in other ways, and the present application does not make specific limitations here.

[0063] Overall, when the fan 4 is started, the air flowing in from the air passage part 5 flows towards the first area of the heat insulation plate 2 to cool the middle and lower parts of the heat insulation plate 2; and the air flowing into the space between the heat insulation plate 2 and the housing 11 from the air inlet part 10 flows towards the second area of the heat insulation plate 2 to cool the middle and upper parts of the heat insulation plate 2. With the mutual cooperation of the above two airflows, the temperatures of both the heat insulation plate 2 and the housing 11 are effectively controlled. Especially for the heat insulation plate 2, since the air introduced through the air passage part 5 can cool the lower part of the heat insulation plate 2, the position of the air inlet part 10 can be raised. Compared with the existing cooling structure, the air flow path can be greatly shortened, so that the relatively low-temperature air can perform centralized heat exchange with the relatively high-temperature area at the upper part of the heat insulation plate 2, ensuring that the temperature of the entire heat insulation plate 2 is effectively controlled.

[0064] In one embodiment, the blower 4 may specifically be a variable-frequency blower. The rotational speed of the blower 4 can adaptively change with the variation of conditions such as the combustion load. The cooling structure formed by the cooperation of the air passage portion 5 formed between the burner 12 and the housing 11 and the air intake portion 10 on the housing 11 can always effectively control the temperature of the heat insulation plate 2 without overheating. Specifically, the following are examples for different actual application scenarios.

[0065] First, take the case where the gas water heater is operating at a low load for illustration. For an up-draft gas water heater, when the gas water heater is operating at a low load, the flame height generated by the burner 12 is relatively low, resulting in a relatively low position of the high-temperature zone. At this time, the middle and lower parts of the heat insulation plate 2 are in the high-temperature zone. When the gas water heater is operating at a low load, correspondingly, the blower 4 is operating at a low rotational speed, the negative pressure generated inside the housing 11 is relatively small, and the overall air volume entering the housing 11 is relatively small. Relatively speaking, the flow resistance at the air passage portion 5 is relatively small. At this time, the cold air flowing from the air passage portion 5 to the heat insulation plate 2 is the main cooling air flow, directly cooling the heat insulation plate 2 in the high-temperature zone; and the cold air entering between the heat insulation plate 2 and the inner wall of the housing 11 from the air intake portion 10 is the auxiliary cooling air flow, used to assist in cooling the upper and middle parts of the heat insulation plate 2 above the air intake portion 10 and the housing 11.

[0066] Secondly, take the case where the gas water heater is operating at a high load for illustration. For an up-draft gas water heater, when the gas water heater is operating at a high load, the flame height generated by the burner 12 is relatively high, and correspondingly, the position of the high-temperature zone is relatively high. At this time, the upper and middle parts of the heat insulation plate 2 are in the high-temperature zone. When the gas water heater is operating at a high load, correspondingly, the blower 4 is operating at a high rotational speed, the negative pressure generated inside the housing 11 is relatively large, and the overall air volume entering the housing 11 is relatively large. The air flow entering from both the air intake portion 10 and the air passage portion 5 is relatively large. At this time, the cold air entering between the heat insulation plate 2 and the inner wall of the housing 11 from the air intake portion 10 is the main cooling air flow, directly cooling the upper and middle parts of the heat insulation plate 2 above the air intake portion 10 in the high-temperature zone and the housing 11; the cold air flowing from the air passage portion 5 to the heat insulation plate 2 is the auxiliary cooling air flow, used to assist in cooling the middle and lower parts of the heat insulation plate 2.

[0067] In addition, take the case where the gas water heater is in a special working condition for illustration. For example, when the exhaust pipe is blocked or the external wind pressure is relatively large and backflow occurs through the exhaust pipe, generally the pressure inside the housing 11 is relatively large, and the high-temperature flue gas will accumulate inside the housing 11 and cannot be discharged. At this time, there is a high possibility of overheating for both the heat insulation plate 2 and the housing 11.

[0068] In order to overcome the problems such as blockage of the smoke exhaust pipe or backflow of external wind, which cause the aggregation of high-temperature flue gas and make it difficult to discharge, generally, the rotation speed of the fan 4 can be increased. After the rotation speed of the fan 4 is increased, the air intake volume can be increased. In particular, the amount of cold air passing through the air passage part 5 and the air intake part 10 is also increased. This can not only prevent excessive aggregation of high-temperature flue gas, but also discharge the small amount of high-temperature flue gas that has already aggregated. More importantly, the cold air flow with a larger flow rate can achieve a good temperature reduction effect on the heat insulation plate 2 and the frame 11.

[0069] Overall, when the variable-speed fan 4 is combined with the gas water heating device provided in this application, whether in a large-load operating state, a small-load operating state, or a special operating condition, the structure in which the air passage part 5 cooperates with the air intake part 10 can ensure that the temperatures of the frame 11 and the heat insulation plate 2 are effectively controlled.

[0070] In the gas water heating device provided in this application, the first region includes: the region where the heat insulation plate 2 is below the height where the air intake part 10 is located; the second region includes: the region where the heat insulation plate 2 is above the height where the air intake part 10 is located. The first region and the second region intersect at least to cover the entire heat insulation plate 2, so that the temperature of the entire heat insulation plate 2 is effectively controlled.

[0071] Specifically, the air entering from the air intake part 10 and the air entering from the air passage part 5 can cooperate in the following way to cool the heat insulation plate 2.

[0072] Generally, the heat insulation plate 2 has opposite first and second surfaces. Among them, the second surface is disposed opposite to the inner wall of the frame 11. When the fan 4 is started, the air flowing in from the air passage part 5 can flow through at least part of the first surface, and the air flowing into the space between the heat insulation plate 2 and the frame 11 can flow through at least part of the second surface.

[0073] That is to say, the air entering from the air passage part 5 is mainly used to cool the first surface of the heat insulation plate 2, and generally contacts the first surface of the middle and lower part of the heat insulation plate 2 to cool it. The air entering from the air intake part 10 is mainly used to cool the second surface of the heat insulation plate 2. Under the suction force generated by the fan 4, the air entering from the air intake part 10 flows upward. Correspondingly, the second surface of the heat insulation plate 2 above the air intake part 10 can contact the air flowing in through the air intake part 10 and thus be cooled.

[0074] In one embodiment, the insulation board 2 has a relative upper end and a lower end, and the lower end of the insulation board 2 is connected to the inner wall of the frame 11 by a sealed connection. The sealed connection method can be: a bending portion is provided at the lower end of the insulation board 2, and the bending portion has an end facing away from the insulation board 2, and the end is in contact with the inner wall of the frame 11. When the sealing method is to provide a bending portion at the lower end of the insulation board 2, and the bending portion is in contact with the insulation board 2, the overall process is simple, the manufacturing cost is low, the installation is convenient, and it has a reliable blocking effect. Of course, the sealed connection method is not limited to the above examples. Inspired by the technical essence of this application, those skilled in the art may make other changes, but as long as the functions and effects achieved are the same or similar to those of this application, they should be covered within the scope of protection of this application.

[0075] When the lower end of the heat insulation board 2 is butted against the inner wall of the frame 11 by a sealed connection, it is equivalent to forming a blocking structure between the lower end of the heat insulation board 2 and the frame 11. After the lower end of the heat insulation board 2 is butted against the frame 11 to form a blocking structure, the air entering from the air passage 5 is not easy to enter the gap between the heat insulation board 2 and the frame 11, and will not be mixed with the cold air entering from the air intake 10, thereby ensuring that the cold air entering from the air intake 10 has a better cooling effect on the upper part of the heat insulation board 2.

[0076] In one embodiment, the lower portion of the frame 11 is in communication with the external atmosphere, and when the fan 4 is started, external air flows into the air passage 5 formed between the burner 12 and the frame 11 .

[0077] In this embodiment, when the fan 4 is started, a large part of the external air enters the burner 12 ; the other part enters the air passage 5 between the burner 12 and the frame 11 , and then flows to the insulation board 2 to cool the insulation board 2 .

[0078] In a specific embodiment, the bottom of the burner 12 can be arranged on a secondary air plate, and a plurality of openings are provided on the secondary air plate. Among them, the openings directly connected to the fire row of the burner 12 are used to supply gas for combustion; and the openings connected to the air passage 5 are used to supply air for cooling the heat insulation board 2 to the air passage 5.

[0079] In addition, an air inlet 110 communicating with the air passage portion 5 may be provided at a position on the housing 11 below the combustion surface of the burner 12. When the burner 12 operates, the plane where the fire holes on the burner grate are located is the combustion surface. In this embodiment, the housing 11 may also be provided with an air inlet 110 at a position below the combustion surface, and the air inlet 110 communicates with the air passage portion 5. When the blower 4 is started, a negative pressure is generated inside the housing 11, and external air can flow through the air inlet 110 to the air passage portion 5.

[0080] In addition, in one embodiment, all the air flowing into the air passage portion 5 comes from the external air entering through the air inlet 110. After the air inlet 110 is separately provided on the housing 11, the cooperation between the air inlet 110 and the air passage portion 5 is equivalent to forming an independent cold air flow channel. The air flowing out of this cold air flow channel is directly guided to the lower end of the heat insulation plate 2 and flows upward along the wall surface of the heat insulation plate 2, which can achieve an ideal cooling effect on the heat insulation plate 2, especially the middle and lower parts of the heat insulation plate 2.

[0081] In one embodiment, the lower end of the heat insulation plate 2 is close to the combustion surface of the burner 12, the upper end of the heat insulation plate 2 is close to the heat exchanger 3, and the height distance from the air inlet portion 10 to the combustion surface is greater than 5 cm.

[0082] In this embodiment, the lower end of the heat insulation plate 2 is close to the combustion surface of the burner 12. Specifically, the part of the lower end of the heat insulation plate 2 forming the blocking structure may be slightly lower than, slightly higher than, or flush with the combustion surface. The upper end of the heat insulation plate 2 is close to the heat exchanger 3.

[0083] Among them, the height distance from the air inlet portion 10 to the combustion surface may be greater than 5 cm. Since the heat insulation plate 2 below the air inlet portion 10 is cooled by the air flowing through the air passage portion 5, the air inlet portion 10 in the present application can be moved upward as much as possible, so as to directly and efficiently cool the high-temperature area in the upper part of the heat insulation plate 2. Of course, the distance from the air inlet portion 10 to the combustion surface can be adaptively adjusted according to the actual operating parameters of the burner 12, such as different combustion loads, etc., and the present application does not make a unique limitation here. Generally, the greater the combustion load, the higher the height of the formed combustion zone, and the greater the distance from the air inlet portion 10 to the combustion surface can be accordingly.

[0084] In one embodiment, the air inlet portion 10 is a plurality of air inlet holes opened at a predetermined height on the side wall of the housing 11, and the predetermined height is located in the upper middle part of the height area of the side wall of the housing 11 opposite to the heat insulation plate 2.

[0085] In this embodiment, the specific form of the air intake portion 10 can be a plurality of air intake holes opened at a predetermined height position on the side wall of the frame 11. Of course, it is not excluded that the air intake portion 10 may be set as an integral long strip opening.

[0086] The air inlet can be located in the middle and upper part of the height area where the side wall of the frame 11 directly opposite to the heat insulation board 2 is located. The lower end of the heat insulation board 2 is close to the combustion surface, and the upper end is close to the heat exchanger 3. The heat insulation board 2 has a predetermined projection area on the side wall of the frame 11. Since an air passage 5 capable of introducing cold air to the middle and lower part of the heat insulation board 2 is formed between the burner 12 and the frame 11, the air inlet can be located in the middle and upper part of the projection area to efficiently cool the middle and upper part of the heat insulation board 2.

[0087] In a specific embodiment, the air inlet holes are arranged circumferentially along the side wall of the frame body 11, and the circumferentially arranged air inlet holes are distributed in at least two rows along the height direction.

[0088] In this embodiment, the air inlet holes can be multiple and arranged circumferentially along the side wall of the frame 11. When the air inlet holes are arranged circumferentially along the frame 11, the air inlet holes can be located at the same height, or can also be set on a temperature curve obtained according to the temperature distribution law of the insulation board 2. Generally, the temperature curve is non-linear. Since the air flow generated by the combustion in the gas chamber generally does not flow 100% uniformly, the temperature at the same height on the insulation board 2 will not be completely consistent. When the air inlet holes are distributed according to the temperature curve, it is more conducive to ensuring that the air entering from the air inlet part 10 has a uniform cooling effect on the insulation board 2. In addition, in order to further ensure that the temperature of the high-temperature area in the upper and middle part of the insulation board 2 is more effectively controlled, the circumferentially arranged air inlet holes can be distributed in at least two rows along the height direction.

[0089] Furthermore, the side of the insulation board 2 is connected to the inner wall of the frame 11 by a sealed connection. The sealed connection method is as follows: a bending portion is provided on the side of the insulation board 2, and the bending portion has an end facing away from the insulation board 2, and the end is fitted with the inner wall of the frame 11. When the sealing method is to provide a bending portion on the side of the insulation board 2, and the bending portion is fitted with the insulation board 2, the overall process is simple, the manufacturing cost is low, the installation is convenient, and a reliable sealing effect is achieved. Of course, the sealed connection method is not limited to the above examples, and those skilled in the art may make other changes inspired by the technical essence of the present application, but as long as the functions and effects achieved are the same or similar to those of the present application, they should be covered within the protection scope of the present application.

[0090] When the lower end and the side edges of the heat insulation plate 2 are butt-jointed with the inner wall of the frame body 11 in a sealed connection manner, it is equivalent to forming a sealing structure between the lower end and the side edges of the heat insulation plate 2 and the frame body 11 respectively. After the lower end and the side edges of the heat insulation plate 2 are butt-jointed with the frame body 11 to form a sealing structure, the air entering through the air passage part 5 basically does not enter the gap between the heat insulation plate 2 and the frame body 11, further ensuring that it will not be mixed with the cold air entering from the air inlet part 10, thereby preferably ensuring that the cold air entering from the air inlet part 10 can achieve a better cooling effect on the upper part of the heat insulation plate 2.

[0091] In one embodiment, the frame body 11 may include opposite first side walls 111 and second side walls 112 and opposite third side walls 113 and fourth side walls 114, and the heat insulation plate 2 is correspondingly arranged on each side wall.

[0092] In this embodiment, the frame body 11 may be a surrounding frame type with both ends open surrounded by four side walls. Among them, the heat insulation plate 2 may be correspondingly arranged on each side wall to ensure that the temperature of each part of the entire frame body 11 does not exceed the temperature limit. Specifically, the first side wall 111 of the frame body 11 may be an installation side wall, and the second side wall 112, the third side wall 113 and the fourth side wall 114 are of an integral structure. Correspondingly, the heat insulation plates 2 corresponding to the second side wall 112, the third side wall 113 and the fourth side wall 114 are also of an integral structure. Specifically, the integral structure may be formed by bending a same plate twice at predetermined positions. On the one hand, the frame body formed by the bending method has better sealing performance, and on the other hand, the process is simple and the manufacturing cost is low.

[0093] The integral structure formed by the above three sides is equivalent to forming an installation opening at the position of the first side wall 111 that is fitted and installed therewith. The burner 12 is installed in the frame body 11 through this installation opening, and then the first side wall 111 is fixedly connected to the above integral structure, which is convenient for installation.

[0094] Please refer to Figure 3 , in one embodiment, the first side wall 111 is an installation side wall, and a limiting plate 6 is arranged between the second side wall 112 and the burner 12, and a diversion part for air flow is formed on the limiting plate 6.

[0095] In this embodiment, the side wall opposite to the installation side wall is the second side wall 112, and a limiting plate 6 is arranged between the second side wall 112 and the burner 12. During installation, the burner 12 enters the frame body 11 through the installation opening of the first side wall 111 to be installed. When the burner 12 contacts the limiting plate 6, it means that the installation is in place. By arranging the limiting plate 6, the installation process of the burner 12 can be simplified, and the accuracy and convenience of the positioning of the burner 12 can be ensured.

[0096] The limiting plate 6 can be specifically fixed to the frame body 11 by means such as bolt connection. Of course, the limiting plate 6 can also be fixed to the frame body 11 by other means, and the present application does not make specific limitations here. A flow guiding portion for air circulation is formed on the limiting plate 6. After the fan 4 is started, the outside air can flow upward through the flow guiding portion of the limiting plate 6 and flow toward the heat insulation plate 2, so as to cool the heat insulation plate 2.

[0097] Specifically, the limiting plate 6 has a plate-shaped body, and the plate-shaped body has opposite first and second surfaces. Grooves are arranged at intervals on the first and second surfaces to form the flow guiding portion.

[0098] In this embodiment, the flow guiding portion on the limiting plate 6 can be formed by arranging through grooves at intervals on the first and second surfaces of the limiting plate 6. The sum of the depth of the groove and the thickness of the body is equal to the distance between the frame body 11 and the burner 12. Specifically, the groove can be a through rectangular groove formed from the lower end to the upper end of the limiting plate 6. Of course, the form of the groove, or rather the form of the flow guiding portion, is not limited to the above examples. Those skilled in the art may make other changes under the inspiration of the technical essence of the present application, but as long as the functions and effects achieved are the same or similar to those of the present application, they should all be covered within the protection scope of the present application.

[0099] In addition, the limiting plate 6 can also include two flat plates spaced apart by a predetermined distance, and the two flat plates can be fixedly connected by a connecting portion, and the gap between adjacent connecting portions forms the flow guiding portion. Of course, the specific form of the limiting plate 6 is not limited to the above examples, and the present application does not make specific limitations here.

[0100] Please refer to Figure 6 , in one embodiment, the heat insulation plate 2 has opposite upper and lower ends, and the heat insulation plate 2 is provided with a stepped portion 21 at a position close to the upper end, and at least one opening groove 20 is arranged on the stepped portion 21, and the air flowing into the space between the heat insulation plate 2 and the frame body 11 can flow out from the opening groove 20.

[0101] In this embodiment, the heat insulation plate 2 has an upper end relatively close to the heat exchanger 3 and a lower end relatively close to the burner 12. The heat insulation plate 2 is provided with a stepped portion 21 at a position close to its upper end, and at least one opening groove 20 for exhausting air is arranged on the stepped portion 21. After the fan 4 is started, the air entering the space between the heat insulation plate 2 and the frame body 11 from the air inlet portion 10 flows upward and flows out through the opening groove 20.

[0102] Specifically, the number of the opening grooves 20 may be one or more, and the present application does not make specific limitations thereto. For example, when the number of the opening grooves 20 is one, it may be an elongated rectangular opening as a whole and extend in the same direction as the extending direction of the side wall of the frame body 11. For example, when the number of the opening grooves 20 is multiple, it may include multiple rectangular openings arranged at intervals along the extending direction of the side wall of the frame body 11.

[0103] The step portion 21 may be specifically formed by bending the heat insulation plate 2 at a position near its upper end. Of course, the step portion 21 may also be formed by other means, and the present application does not make specific limitations thereto. The bending angle may be 90 degrees, or may also be an obtuse angle, and specifically the present application does not make specific limitations thereto. When the air after heat exchange with the heat insulation plate 2 and the frame body 11 flows out from the opening groove 20 on the step portion 21, a protective air flow can be formed near the opening groove 20, and the high-temperature flue gas is blocked by the air flow and will not directly contact the heat insulation plate 2 in this part, thereby producing a certain temperature reduction effect on the heat insulation plate 2 and preventing its temperature from being too high.

[0104] Further, at least a part of the heat insulation plate 2 between the step portion 21 and the upper end thereof is in contact with the inner wall of the frame body 11.

[0105] In this embodiment, the heat insulation plate 2 may be provided with an extension portion at a position above the step portion 21, and the extension portion may be in contact with the inner wall of the frame body 11 partially or entirely. On the one hand, it can guide the air entering from the air inlet portion 10 so that it all flows out from the opening groove 20. On the other hand, it can transfer the too high temperature in the upper part of the heat insulation plate 2 to the frame body 11, avoiding local overheating of the heat insulation plate 2 and causing it to be scrapped prematurely.

[0106] Specifically, the distance from the step portion 21 to the upper end of the heat insulation plate 2 may be less than 10 cm. Overall, the step portion 21 is located at a position near the upper end of the heat insulation plate 2, and the heat insulation plate 2 is provided with a fitting section in contact with the inside of the frame body 11 above the step portion 21. The height of the fitting section should not be too high, because if it is too high, the cold air entering from the air inlet portion 10 cannot contact the fitting section and thus cannot cool it. In summary, the setting position of the step portion 21 is generally to ensure that the temperatures of the entire heat insulation plate 2 and the frame body 11 opposite to the heat insulation plate 2 can be effectively controlled. Of course, in actual applications, those skilled in the art can further refine this numerical range, and the present application does not make further limitations thereto.

[0107] In one embodiment, a flow guiding component is disposed between the heat insulating plate 2 and the inner wall of the frame body 11. The flow guiding component cooperates with the heat insulating plate 2 and the frame body 11 to form a predetermined sealed flow path. Gas flows in from the air inlet portion 10 and flows through the sealed flow path in a predetermined flow direction and then flows out from the opening groove 20.

[0108] In this embodiment, a flow guiding component may be disposed between the heat insulating plate 2 and the inner wall of the frame body 11. The flow guiding component may cooperate with the heat insulating plate 2 and the frame body 11 to divide the gap between the heat insulating plate 2 and the frame body 11, so as to form a predetermined sealed flow path. The sealed flow path has opposite inlet and outlet ends, where the inlet end may be directly connected to the air inlet portion 10 or the inlet end is the air inlet portion 10, and the outlet end may be directly connected to the opening groove 20 or the outlet end is the opening groove 20. When the fan 4 is started, gas flows in from the air inlet portion 10, flows through the sealed flow path in a predetermined flow direction and then flows out from the opening groove 20, so that the contact time of the gas with the upper part of the heat insulating plate 2 can be prolonged, and the incoming cold air can fully exchange heat with the middle and upper parts of the heat insulating plate 2, ensuring that the middle and upper parts of the heat insulating plate 2 will not overheat.

[0109] Specifically, the flow guiding component may be in the form of one or more partition plates, which divide the gap between the heat insulating plate 2 and the frame body 11 to form a tortuous flow path. Of course, the specific form of the flow guiding component is not limited to the above examples, and the corresponding form of forming the sealed flow path is not limited to the above examples either, and the present application does not make specific limitations here.

[0110] In one embodiment, the heat insulating plate 2 has opposite upper and lower ends and opposite left and right ends. The lower end of the heat insulating plate 2 and the left and right ends are respectively in contact with the inner wall of the frame body 11 from the lower end to a predetermined height, where the predetermined height is not less than the distance from the lower end of the heat insulating plate 2 to the air inlet portion 10.

[0111] In this embodiment, the lower end of the heat insulation plate 2 is attached to the inner wall of the frame body 11 to form a sealing structure. In addition, the left end or the right end of the heat insulation plate 2 is attached to the inner wall of the frame body 11 from the lower end to a predetermined height to form a lower end sealing mechanism. The predetermined height is not less than the distance from the lower end of the heat insulation plate 2 to the air inlet portion 10. That is to say, at least from the lower end to the position of the air inlet portion 10, a side sealing structure is formed between the left side and the right side of the heat insulation plate 2 and the inner wall of the frame body 11. The lower end sealing structure and the side sealing structure cooperate to ensure that the air entering from the air passing portion 5 does not enter the gap between the partition plate and the frame body 11, thereby reducing the cooling effect of the cold air entering from the air inlet portion 10 on the heat insulation plate 2 and the frame body 11. Generally, when the outside air enters the frame body 11 through the air passing portion 5 and is guided to the heat insulation plate 2, as the flow path increases and the temperature rises, it will diverge. When it flows to the height position of the air inlet portion 10, the air flow rate is already small and will not have a great impact on the air entering from the air inlet portion 10.

[0112] In summary, in the gas water heater provided in the embodiment of the present application, an air inlet portion 10 is provided on the frame body 11 provided with the heat insulation plate 2, and an air passing portion 5 is formed between the burner 12 and at least a part of the frame body 11. When the fan 4 is started, the air entering from the air inlet portion 10 flows into the space between the heat insulation plate 2 and the frame body 11 to form a first cooling air flow, and at least part of the air flowing in from the air passing portion 5 flows to the heat insulation plate 2 to form a second cooling air flow. With the cooperation of the above two air flows, the temperatures of both the heat insulation plate 2 and the frame body 11 are effectively controlled. Especially for the heat insulation plate 2, since the air introduced through the air passing portion 5 can cool the lower part of the heat insulation plate 2, the position of the air inlet portion 10 can be raised. Compared with the existing cooling structure, the air flow path can be greatly shortened, so that the air with a lower temperature can perform centralized heat exchange with the higher temperature area of the upper part of the heat insulation plate 2, ensuring that the temperature of the entire heat insulation plate 2 is effectively controlled.

[0113] The above embodiments in this specification are all described in a progressive manner. The same or similar parts between the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

[0114] The above are only several embodiments of the present invention. Although the embodiments disclosed in the present invention are as above, the above content is only an embodiment adopted for the convenience of understanding the present invention and is not used to limit the present invention. Any person skilled in the art in the technical field to which the present invention belongs, without departing from the spirit and scope disclosed by the present invention, can make any modifications and changes in the form and details of the embodiments, but the scope of patent protection of the present invention must still be subject to the scope defined by the appended claims.

Claims

1. A gas water heater, comprising a combustion device, a heat exchanger and a fan arranged in sequence from bottom to top, Features: The combustion device comprises a frame and a burner, wherein the burner is used to mix gas and air and then burn them, and the burner comprises a plurality of fire rows arranged in parallel, and an air passage portion is formed between the burner and the frame; A heat insulation board is arranged in the frame at a predetermined distance from the inner wall of the frame, and the heat insulation board has a first surface and a second surface opposite to each other; the second surface is arranged opposite to the inner wall of the frame; an air inlet is arranged on the frame; When the fan is started, the air entering from the air intake portion flows into between the heat insulation board and the frame, and the air flowing into between the heat insulation board and the frame can flow through at least a portion of the second surface; the lower portion of the frame is connected to the external atmosphere, and part of the external air entering from the lower portion of the frame enters the burner; and part of the air enters the air passing portion between the burner and the frame, and the air flowing in from the air passing portion can flow through at least a portion of the first surface.

2. The gas water heater according to claim 1, It is characterized in that The fan is a variable frequency fan.

3. The gas water heater according to claim 1 or 2, It is characterized in that The heat insulation board has an upper end and a lower end opposite to each other, and the lower end of the heat insulation board is in contact with the inner wall of the frame body.

4. The gas water heater according to claim 3, It is characterized in that The side edge of the heat insulation board is in contact with the inner wall of the frame body.

5. The gas water heater according to claim 4, It is characterized in that The docking method is as follows: a bending portion is provided at the lower end and / or the side of the heat insulation board, the bending portion has an end portion facing away from the heat insulation board, and the end portion is in contact with the inner wall of the frame.

6. The gas water heater according to claim 4, It is characterized in that The frame body comprises a first side wall and a second side wall opposite to each other and a third side wall and a fourth side wall opposite to each other, and each side wall is correspondingly provided with the heat insulation board.

7. The gas water heater according to claim 6, It is characterized in that The second side wall, the third side wall and the fourth side wall are an integrated structure, and the heat insulation board corresponding to the second side wall, the third side wall and the fourth side wall is also an integrated structure.

8. The gas water heater according to claim 6, It is characterized in that A limiting plate is arranged between the second side wall and the burner, and a guide portion for circulating air is formed on the limiting plate.

9. The gas water heater according to claim 2, It is characterized in that The heat insulation board has an upper end and a lower end opposite to each other. The heat insulation board is provided with a step portion near the upper end. The step portion is provided with at least one open groove. The air flowing into between the heat insulation board and the frame can flow out from the open groove.

10. The gas water heater according to claim 9, It is characterized in that The distance from the step portion to the upper end of the heat insulation board is less than 10 centimeters.

11. The gas water heater according to claim 9, It is characterized in that At least a part of the heat insulation plate between the step portion and the upper end is in contact with the inner wall of the frame body.

12. The gas water heating device according to claim 9, characterized in that a flow guiding member is provided between the heat insulation plate and the inner wall of the frame body, and the flow guiding member and the heat insulation plate and the frame body cooperate to form a predetermined sealed flow path, and gas flows in from the air inlet portion and flows through the sealed flow path in a predetermined flow direction and then flows out from the opening groove.

13. The gas water heating device according to claim 4, characterized in that the heat insulation plate has an upper end and a lower end opposite to each other and a left end and a right end opposite to each other, the lower end of the heat insulation plate, and the left end and the right end are respectively in contact with the inner wall of the frame body from the lower end to a predetermined height, wherein the predetermined height is not less than the distance from the lower end of the heat insulation plate to the air inlet portion.

14. The gas water heating device according to claim 1, characterized in that the air passage portion is formed by a gap between the burner and the frame body.

Images