CN117167959A

CN117167959A - Gas water heater

Info

Publication number: CN117167959A
Application number: CN202311087781.8A
Authority: CN
Inventors: 蔡茂虎; 段毅
Original assignee: AO Smith China Water Heater Co Ltd
Current assignee: AO Smith China Water Heater Co Ltd
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2023-12-05
Also published as: CN117167960A; CN108489074B; CN108489074A; CN117167961A

Abstract

The application discloses a gas water heating device, which comprises a combustion device, a heat exchanger and a fan, wherein the combustion device, the heat exchanger and the fan are sequentially arranged from bottom to top, the combustion device comprises a frame body and a burner, the burner is used for mixing fuel gas and air and then burning the mixture, the burner comprises a plurality of fire rows which are arranged in parallel, and an air passing part is formed between the burner and the frame body; a heat insulation plate is arranged in the frame body at a preset distance from the inner wall of the frame body, and the heat insulation plate is provided with a first surface and a second surface which are opposite; the second surface is arranged opposite to the inner wall of the frame body; an air inlet part is arranged on the frame body; air flowing in from the air passing portion can flow through at least part of the first surface. The gas water heating device provided by the application can ensure that the temperatures of the heat insulation plate and the frame body of the combustion device can be effectively controlled, thereby ensuring the running reliability of the whole machine and improving the user experience.

Description

Gas water heater

The application relates to a divisional application with the application number of 201810513073.9, the application date of 2018, 05 month and 25 days and the name of gas water heater.

Technical Field

The invention relates to the field of gas appliances, in particular to a gas water heating device.

Background

The gas water heater generally uses gas as fuel, and transfers energy to cold water flowing through a heat exchanger in a combustion heating mode, so as to achieve the purpose of preparing hot water. The specific forms of the gas water heating device comprise a wall-mounted furnace, a gas water heater and the like.

In general, the gas water heating apparatus mainly includes: the device comprises a shell, a combustion device for generating high-temperature heat energy by combusting fuel gas, a heat exchanger for circulating water to be heated, a fan for providing airflow power and other components. Wherein, the burner is arranged in the combustion device, which generates high-temperature heat energy when in operation, so that a high-temperature area is formed in a preset space above the combustion surface of the burner. In order to avoid that the heat energy of the high temperature is transferred to the electronic components and the housing around the high temperature area, a corresponding cooling structure is usually arranged around the frame of the high temperature area around the burner.

In the prior art, for example, chinese specification CN206944451U discloses a gas water heating apparatus, which is provided with a heat insulating plate on the inner side of a surrounding frame and an air inlet portion on the surrounding frame. When the fan operates, air outside the enclosure frame can flow into the space between the enclosure frame and the heat insulation plate through the air inlet part, so that the enclosure frame is cooled.

However, the applicant further found after study: although the temperature of the surrounding frame is effectively controlled after the cooling structure is arranged, the phenomenon that the temperature of the heat insulation plate is too high locally occurs. When the local temperature of the heat insulation plate is too high, local deformation possibly occurs, so that the heat insulation plate is scrapped prematurely, the operation reliability of the whole machine is affected, and the user experience is reduced.

In summary, it is necessary to further optimize and improve the existing gas water heater to ensure that the temperatures of the heat insulation board and the frame body 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.

Disclosure of Invention

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

The above object of the present invention can be achieved by the following technical solutions:

the gas water heating device comprises a combustion device, a heat exchanger and a fan which are sequentially arranged from bottom to top, wherein the combustion device comprises a frame body and a burner which is at least partially arranged in the frame body and is close to one end of the frame body, which is far away from the heat exchanger, and an air passing part is formed between the burner and at least part of the frame body;

A heat insulation plate is arranged in the frame body at a preset distance from the inner wall of the frame body, and an air inlet part is arranged on the frame body;

when the fan is started, air entering from the air inlet part flows into the space between the heat insulation plate and the frame body, and at least part of the air flowing in from the air passing part flows to the heat insulation plate.

Further, the fan is a variable frequency fan.

Further, the heat shield has opposed first and second surfaces; the second surface is arranged opposite to the inner wall of the frame body;

when the fan is started, air flowing in from the air passing part can flow through at least part of the first surface, and air flowing in between the heat insulation plate and the frame body can flow through at least part of the second surface.

Further, the heat insulating plate is provided with an upper end and a lower end which are opposite, and the lower end of the heat insulating plate is butted with the inner wall of the frame body in a sealing connection mode.

Further, the lower end of the heat insulating plate is close to the combustion surface of the combustor, the upper end of the heat insulating plate is close to the heat exchanger, and the height distance from the air inlet part to the combustion surface is more than 5 cm.

Further, the side edge of the heat insulation plate is in butt joint with the inner wall of the frame body in a sealing connection mode.

Further, the sealing connection mode is as follows: the lower extreme, the side of heat insulating board are provided with the portion of bending, the portion of bending has deviating from the tip of heat insulating board, the tip with the inner wall of framework is laminated mutually.

Further, the frame body comprises a first side wall, a second side wall, a third side wall and a fourth side wall, wherein the first side wall and the second side wall are opposite to each other, and the heat insulation plate is correspondingly arranged on each side wall.

Further, the first side wall of the frame body is an installation side wall, the two side walls, the third side wall and the fourth side wall are of an integrated structure, and the heat insulation plates corresponding to the second side wall, the third side wall and the fourth side wall are of an integrated structure.

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 flow guide part for circulating air is formed on the limiting plate.

Further, the heat insulating plate has an upper end and a lower end which are opposite, a step part is arranged at a position close to the upper end of the heat insulating plate, at least one open groove is arranged on the step part, and air flowing into the space between the heat insulating plate and the frame body can flow out of the open groove.

Further, the distance from the step part to the upper end of the heat insulation plate is smaller than 10 cm.

Further, at least part of the heat insulation plate between the step part and the upper end is attached to the inner wall of the frame body.

Further, a flow guide component is arranged between the heat insulation plate and the inner wall of the frame body, the flow guide component, the heat insulation plate and the frame body are matched to form a preset sealing flow channel, gas flows in from the air inlet part, flows through the sealing flow channel according to a preset flowing direction, and flows out from the opening groove.

Further, the heat insulating plate has opposite upper and lower ends and opposite left and right ends, the lower end of the heat insulating plate and the left and right ends respectively from the lower end to a predetermined height are attached to the inner wall of the frame body, wherein the predetermined height is not less than the distance from the lower end of the heat insulating plate to the air inlet portion.

Further, the air inlet part is a plurality of air inlet holes formed in the side wall of the frame body at a preset height, and the preset height is positioned at the middle upper part of a height area where the side wall of the frame body opposite to the heat insulation plate is positioned.

Further, the air inlets are circumferentially arranged along the side wall of the frame body, and at least two rows of circumferentially arranged air inlets are distributed along the height direction.

when the fan is started, air flowing in from the air passing part flows to a first area of the heat insulation plate, and air flowing in from the air inlet part between the heat insulation plate and the frame body flows to a second area of the heat insulation plate.

Further, the fan is a variable frequency fan.

Further, the first region includes: the heat insulating plate is positioned in an area below the height of the air inlet part, and the second area comprises: the heat insulation plate is located in a region above the height of the air inlet part, and the first region and the second region at least intersect to cover the whole heat insulation plate.

According to the technical scheme provided by the embodiment of the application, the air inlet part is arranged on the frame body provided with the heat insulation plate, the air passing part is formed between the burner and at least part of the frame body, after the fan is started, air entering from the air inlet part flows into the space between the heat insulation plate and the frame body to form first cooling air flow, and air flowing from the air passing part at least partially flows to the heat insulation plate to form second cooling air flow, so that the temperature of the heat insulation plate and the temperature of the frame body are effectively controlled under the mutual coordination of the two air flows. Particularly for the heat insulation plate, the lower part of the heat insulation plate can be cooled by the air introduced by the air passing part, so that the position of the air inlet part can be adjusted upwards, compared with the existing cooling structure, the air flow can be greatly shortened, the air with lower temperature can perform concentrated heat exchange with the area with higher temperature on the upper part of the heat insulation plate, and the temperature of the whole heat insulation plate is ensured to be effectively controlled.

Drawings

FIG. 1 is a schematic view of a gas water heating device according to an embodiment of the present application;

FIG. 2 is a front view of a combustion device in a gas water heating device according to an embodiment of the present application;

FIG. 3 is a top view of a combustion device in a gas water heating device according to one embodiment of the present application;

FIG. 4 is a cross-sectional view of a combustion apparatus in a gas water heating apparatus according to an embodiment of the present application;

FIG. 5 is a partial cross-sectional view of a portion of a combustion apparatus mated with a heat shield in a gas water heating apparatus according to one embodiment of the present application;

fig. 6 is a schematic structural view of an insulation board of a gas water heater according to an embodiment of the present application.

Reference numerals illustrate:

1-a combustion device; 10-an air inlet part; 11-a frame; 110-air inlet; 12-a burner; 2-heat insulation board; 20-an open slot; 21-a step; 3-heat exchanger; 31-water inlet pipe; 32-a water outlet pipe; 4-a fan; 5-an air passage portion; 111-a first sidewall; 112-a second sidewall; 113-a third sidewall; 114-a fourth sidewall; and 6-limiting plates.

Detailed Description

The technical solution of the present application will be described in detail below with reference to the attached drawings and specific embodiments, it should be understood that these embodiments are only for illustrating the present application and not for limiting the scope of the present application, and various modifications of equivalent forms of the present application will fall within the scope of the appended claims after reading the present application.

It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the prior art, after the fan is started, cold air entering from the air inlet part of the first surrounding frame gradually moves upwards after flowing through the space between the heat insulation plate and the first surrounding frame. In the upward moving process, the air with lower temperature exchanges heat with the first surrounding frame and the heat insulation plate. In the heat exchange process, the temperature of air rises gradually, when reaching the upper end of first enclosing frame, because whole flow is longer, the air is heated to higher temperature on the one hand, and on the other hand is easy to diverge after reaching the high temperature region, consequently can't reach good cooling effect to first enclosing frame or heat insulating board. The position of the highest temperature of the whole combustion chamber is close to the upper end of the first surrounding frame, so that the upper part of the heat insulation plate is always in a high-temperature environment in use. When the upper part of the heat insulation plate is in a high-temperature environment for a long time, local deformation is easy to occur, so that the heat insulation plate is scrapped prematurely, the operation reliability of the whole machine is affected, and the user experience is reduced.

The application provides a gas water heating device, which can overcome the defects in the prior art, and ensure that the temperatures of a heat insulation plate positioned in a high temperature area and a combustion device frame body can be effectively controlled within a preset range, thereby ensuring the running reliability of the whole machine and improving the user experience.

In the prior art, the air supply mode of the gas water heating device comprises a blowing mode and an air suction mode. For the blast type gas water heater, the fan is generally arranged at the lower part of the burner, and the fan, the burner and the heat exchanger are sequentially arranged from bottom to top. Positive pressure is established in the combustion chamber of the gas water heater, which cannot have openings therein, through which the flame would otherwise blow out to directly raise the temperature of the components surrounding the combustion chamber and the housing.

In the present application, the air blowing method used in the gas water heater is an air draft method, for example, an updraft method. When the gas water heating device adopts the mode of updraft, the combustion device, the heat exchanger and the fan are sequentially arranged from bottom to top. When the gas water heating device adopts an air supply mode of air draft, negative pressure is formed in the combustion chamber inside the gas water heating device, namely, the internal pressure of the gas water heating device is smaller than the external pressure, so that flame overflow cannot be caused, and the gas water heating device is reliable and safe in use.

Referring to fig. 1 to 5 in combination, a gas water heating apparatus according to an embodiment of the present application may include: the combustion device 1, the heat exchanger 3 and the fan 4 are sequentially arranged from bottom to top. Wherein the combustion device 1 comprises a frame 11 and a burner 12 which is at least partially arranged in the frame 11 and is close to one end of the frame far away from the heat exchanger 3, and an air passing part 5 is formed between the burner 12 and at least part of the frame 11; the heat insulation plate 2 is arranged in the frame 11 at a preset distance from the inner wall of the frame 11, and the air inlet part 10 is arranged on the frame 11; when the blower 4 is started, the air introduced from the air inlet 10 flows between the heat shield 2 and the frame 11, and the air introduced from the air passage 5 flows at least partially toward the heat shield 2.

The gas water heating device provided by the application can particularly adopt an updraft mode. When the gas water heating device is in the form of updraft, the combustion device 1, the heat exchanger 3 and the fan 4 are sequentially arranged from bottom to top. In the following embodiments, the above-mentioned air-draft type gas water heater is mainly exemplified, and the below-draft type gas water heater can be referred to as the above-draft type gas water heater, which is not described herein.

In the present embodiment, the fan 4 is used to provide driving force for airflow. Specifically, the structure of the fan 4 itself, and the arrangement position and arrangement manner thereof may be different according to the actual usage scenario, and the present application is not limited herein.

In the present embodiment, the heat exchanger 3 is used to circulate water to be heated. Specifically, the heat exchanger 3 may be in the form of a heat exchange tube, one end of which is connected to the water inlet pipe 31, and the other end of which is connected to the water outlet pipe 32. Of course, the shape, configuration, etc. of the heat exchanger 3 may be different according to the actual use situation, and the present application is not particularly limited herein.

In the present embodiment, the combustion apparatus 1 may include a burner 12 and a housing 11. Wherein the burner 12 is used for mixing and burning the fuel gas and the air. When ignited, the high temperature flue gas generated by the combustion of the gas and air mixture can be used to heat the water flow in the heat exchanger 3. In particular, the burner 12 may include a plurality of fire rows arranged in parallel, and the plurality of fire rows may be mounted on a mounting base. Of course, the structure, form, etc. of the burner 12 may be different according to the actual use scenario, and the present application is not limited thereto.

The frame 11 is used to form a combustion chamber. Specifically, the frame 11 may be an enclosure frame with two open ends, and the burner 12 is disposed at one end of the enclosure frame away from the heat exchanger 3. The burner 12 may be provided entirely in the housing 11 or may be provided partially in the housing 11, and the present application is not limited thereto.

The frame 11 is provided therein with a heat insulating plate 2, and the heat insulating plate 2 is disposed at a predetermined distance from the inner wall of the frame 11. The heat insulating plate 2 is used for insulating high-temperature heat energy of a combustion zone from the frame 11 on one hand and is used for forming a flow passage capable of circulating air in cooperation with the frame 11 on the other hand. Specifically, the heat insulation board 2 may be a thin plate made of a high temperature resistant material, and has a predetermined distance from the frame 11, where the predetermined distance is used to ensure that a gap is formed between the heat insulation board 2 and the frame 11, and the size of the predetermined distance is not specifically limited herein.

An air inlet 10 is provided at a predetermined position on the housing 11, and when the blower 4 is started, external air can flow into a flow passage formed between the heat shield 2 and the housing 11 through the air inlet 10. An air passage 5 is formed between the burner 12 and at least a part of the housing 11. Through which air passing through the air passage 5 is allowed to enter and then at least partly flow towards the heat shield 2. Specifically, the air passage 5 may be formed by a gap between the burner 12 and the housing 11, and the air passage 5 may be formed by other means, however, the present application is not limited thereto.

In the whole, when the fan 4 is started, the air flowing in from the air passing part 5 flows to the first area of the heat insulation plate 2 for cooling the middle lower part of the heat insulation plate 2; and air flowing from the air inlet 10 between the heat insulating plate 2 and the frame 11 flows to the second region of the heat insulating plate 2 for cooling the middle upper part of the heat insulating plate 2; the temperature of the heat insulation board 2 and the frame 11 are effectively controlled under the mutual matching of the two air flows. Particularly for the heat insulation board 2, the air introduced by the air passing portion 5 can cool the lower portion of the heat insulation board 2, so that the position of the air inlet portion 10 can be adjusted upwards, compared with the existing cooling structure, the air flow can be greatly shortened, the air with lower temperature can perform concentrated heat exchange with the area with higher temperature on the upper portion of the heat insulation board 2, and the temperature of the whole heat insulation board 2 is ensured to be effectively controlled.

In one embodiment, the fan 4 may be a variable frequency fan. The rotation speed of the fan 4 can be adaptively changed along with the change of conditions such as combustion load, and the temperature reduction structure formed by the cooperation of the air passing part 5 formed between the burner 12 and the frame 11 and the air inlet part 10 on the frame 11 can always ensure that the temperature of the heat insulation plate 2 is effectively controlled without overtemperature. Specifically, the following is exemplified for different practical application scenarios.

First, an example in which the gas water heater is operated at a small load will be described. For the updraft type gas water heating device, when the gas water heating device is in a low-load running state, the high-temperature area is also lower due to the lower flame height generated by the burner 12, and the middle lower part of the heat insulation plate 2 is positioned in the high-temperature area. When the gas water heating device is in a small-load running state, correspondingly, the fan 4 is in a low-rotation-speed running state, the negative pressure generated in the frame 11 is small, the whole air quantity entering the frame 11 is small, and the flow resistance of the air passing part 5 is relatively small. At this time, the cold air flowing from the air passing portion 5 to the heat insulation plate 2 is mainly cooled air flow, and the heat insulation plate 2 in a high temperature region is directly cooled; the cold air entering between the heat insulation plate 2 and the inner wall of the frame 11 from the air inlet 10 is an auxiliary cooling air flow for assisting in cooling the middle upper part of the heat insulation plate 2 above the air inlet 10 and the frame 11.

Next, an example in which the gas water heater is operated at a large load will be described. For the upper exhaust type gas water heating device, when the gas water heating device is in a large-load running state, the height of flame generated by the burner 12 is higher, and correspondingly, the high-temperature area is also higher, and the middle upper part of the heat insulation plate 2 is positioned in the high-temperature area. When the gas water heater is in a heavy-load running state, the fan 4 is correspondingly in a high-rotation-speed running state, the negative pressure generated in the frame 11 is large, the whole air quantity entering the frame 11 is large, and the air quantity entering from the air inlet part 10 and the air passing part 5 is large. At this time, the cold air entering between the heat insulating plate 2 and the inner wall of the frame 11 from the air inlet 10 is used as the main cooling air flow, and the heat insulating plate 2 and the frame 11 at the upper middle part above the air inlet 10 in the high temperature region are directly cooled; the cold air flowing from the air passing portion 5 to the heat insulating plate 2 is an auxiliary cooling air flow for assisting in cooling the middle lower portion of the heat insulating plate 2.

In addition, the gas water heater is exemplified as being under a special working condition. For example, when the smoke exhaust pipe is blocked or the external wind pressure is large, the pressure in the frame 11 is large in general and the high-temperature smoke can be gathered in the frame 11 and cannot be exhausted, and at this time, the heat insulation plate 2 and the frame 11 have large possibility of overtemperature.

In order to solve the problem that high-temperature flue gas is accumulated and difficult to be discharged due to the blockage of the smoke exhaust pipe or the backflow of external wind and the like, the rotating speed of the fan 4 can be generally increased. After the rotation speed of the fan 4 is increased, the air intake can be increased, and particularly the amount of cold air passing through the air passing portion 2 and the air intake portion 10 is increased, so that not only can the excessive aggregation of high-temperature flue gas be prevented, but also a small amount of aggregated high-temperature flue gas can be discharged, and more importantly, the cold air flow with larger flow can achieve a good cooling effect on the heat insulation plate 2 and the frame 11.

In the whole, after the variable speed fan 4 is combined with the gas water heating device provided by the application, the temperature of the frame 11 and the heat insulation plate 2 can be effectively controlled under the condition of large load operation or small load operation or special operation conditions by the structure of the air passing part 5 matched with the air inlet part 10.

In the gas water heating device provided by the application, the first area comprises: the heat insulating plate 2 is located in a region below the height of the air inlet 10, and the second region includes: the heat insulation board 2 is located in a region above the height of the air inlet 10, and the first region and the second region at least intersect to cover the whole heat insulation board 2, so that the temperature of the whole heat insulation board 2 is effectively controlled.

Specifically, the air entering the air inlet portion 10 and the air entering the air passing portion 5 may cooperate to cool the heat insulation board 2 in the following manner.

Generally, the insulating panel 2 has opposed first and second surfaces. Wherein the second surface is disposed opposite to the inner wall of the frame 11. When the fan 4 is started, air flowing in from the air passing portion 5 can flow through at least part of the first surface, and air flowing in between the heat insulation plate 2 and the frame 11 can flow through at least part of the second surface.

That is, the air introduced from the air passing portion 5 is mainly used for cooling the first surface of the heat insulation plate 2, and is generally in contact with the first surface of the heat insulation plate 2 located at the middle lower portion so as to cool the same. The air entering from the air inlet 10 is mainly used for cooling the second surface of the heat insulation board 2. The air introduced from the air inlet portion 10 flows upward by the suction force generated by the blower 4. Accordingly, the heat shield 2 can be brought into contact with the air flowing in through the air inlet 10 at the second surface above the air inlet 10, thereby being cooled.

In one embodiment, the heat insulation board 2 has opposite upper and lower ends, and the lower end of the heat insulation board 2 is abutted with the inner wall of the frame 11 in a sealing connection manner. The sealing connection mode can be as follows: the lower extreme of heat insulating board 2 is provided with the bending part, the bending part has the tip of deviating from heat insulating board 2, the tip with the inner wall of framework 11 laminating mutually. When the sealing mode is that the bending part is arranged at the lower end of the heat insulation plate 2 and the heat insulation plate 2 is attached through the bending part, the process is simple as a whole, the manufacturing cost is low, the installation is convenient, and the sealing effect is reliable. Of course, the sealing connection is not limited to the above examples, and other modifications are possible by those skilled in the art in light of the technical spirit of the present application, but all the functions and effects of the sealing connection are the same as or similar to those of the present application, and are included in the protection scope of the present application.

When the lower end of the heat insulation plate 2 is in butt joint with the inner wall of the frame 11 in a sealing connection manner, a blocking structure is formed between the lower end of the heat insulation plate 2 and the frame 11. After the lower end of the heat insulation plate 2 is abutted with the frame 11 to form a blocking structure, air entering from the air passing portion 5 is not easy to enter a gap between the heat insulation plate 2 and the frame 11, and is not mixed with cold air entering from the air inlet portion 10, so that the cold air entering from the air inlet portion 10 is guaranteed to achieve a better cooling effect on the upper portion of the heat insulation plate 2.

In one embodiment, the lower portion of the housing 11 communicates with the outside atmosphere, and when the blower 4 is started, outside air flows into the air passage portion 5 formed between the burner 12 and the housing 11.

In the present embodiment, when the blower 4 is started, a large part of the outside air enters the burner 12; the other part enters the air passing portion 5 between the burner 12 and the frame 11, and then flows toward the heat shield 2, thereby cooling the heat shield 2.

In one embodiment, the bottom of the burner 12 may be positioned on a secondary air plate having a plurality of openings formed therein. Wherein the openings in direct communication with the fire row of the burner 12 are used for supplying combustion gas; and the opening communicating with the air circulation portion 5 is used for supplying air for cooling the heat insulating plate 2 to the air passage portion 5.

The housing 11 may be provided with an air inlet 110 communicating with the air passage 5 at a position below the combustion surface of the burner 12. When the burner 12 is in operation, the plane of the fire outlet on the fire row is the combustion surface. In the present embodiment, the housing 11 may be provided with an air inlet 110 at a position below the combustion surface, the air inlet 110 may be in communication with the air passage 5, and when the blower 4 is started, a negative pressure may be generated in the housing 11, and external air may flow to the air passage 5 through the air inlet 110.

In one embodiment, all of the air flowing into the air passage 5 is from the outside air entering through the air inlet 110. When the air inlet 110 is separately provided in the frame 11, the air inlet 110 and the air passage 5 are combined to form a single cool air passage, and the cool air flows out of the cool air passage and is directly guided to the lower end of the heat insulation plate 2, and flows upward along the wall of the heat insulation plate 2, thereby achieving a desired cooling effect on the heat insulation plate 2, particularly, the middle lower portion of the heat insulation plate 2.

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

In this embodiment, the lower end of the heat insulation plate 2 is close to the combustion surface of the burner 12, specifically, the portion of the lower end of the heat insulation plate 2 where the blocking structure is formed may be slightly lower than the combustion surface or slightly higher than the combustion surface or flush with the combustion surface. The upper end of the heat insulating plate 2 is close to the heat exchanger 3.

Wherein the height distance from the air inlet 10 to the combustion surface may be greater than 5 cm. Since the heat shield 2 below the air inlet 10 is cooled by the air flowing in through the air passage 5, the air inlet 10 in the present application can be moved upward as much as possible, and the high temperature area above the heat shield 2 can be cooled directly and efficiently. Of course, the distance of the air intake portion 10 from the combustion surface can be adaptively adjusted according to actual operating parameters of the burner 12, such as the difference in combustion load, etc., and the present application is not limited thereto. In general, the greater the combustion load, the greater the height of the combustion zone formed, and the greater the distance from the intake portion 10 to the combustion surface.

In one embodiment, the air inlet 10 is a plurality of air inlet holes formed at a predetermined height of the side wall of the frame 11, and the predetermined height is located at a middle upper portion of a height area of the side wall of the frame 11 opposite to the heat insulation board 2.

In this embodiment, the specific form of the air intake portion 10 may be a form of a plurality of air intake holes formed at a predetermined height position of the side wall of the frame 11, and it is needless to say that it is not excluded that the air intake portion 10 may be formed as a single elongated hole.

Wherein, the position of the air inlet hole can be positioned at the middle upper part of the height area of the side wall of the frame body 11 opposite to the heat insulation plate 2. The lower end of the heat insulating plate 2 is close to the combustion surface, the upper end is close to the heat exchanger 3, and the heat insulating plate 2 has a predetermined projection area on the side wall of the frame 11. Since the air passing portion 5 for introducing cool air into the middle lower portion of the heat shield 2 is formed between the burner 12 and the frame 11, the air inlet hole may be located at the middle upper portion of the projected area to efficiently cool the middle upper portion of the heat shield 2.

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

In this embodiment, the air intake holes may be arranged in a plurality along the circumference of the side wall of the frame 11. When the air intake holes are arranged along the circumferential direction of the frame 11, the air intake holes may be located at the same height, or may be provided on a temperature curve obtained according to the temperature distribution law of the heat insulation board 2. In general, the temperature profile is non-linear, and the temperature of the insulating panel 2 at the same height is not completely uniform because the air flow generated by combustion in the gas chamber is generally not uniform in one hundred percent. When the air inlet holes are distributed according to the temperature curve, the effect of uniformly cooling the heat insulation plate 2 by the air entering from the air inlet part 10 is more beneficial to guarantee. In addition, in order to further ensure that the temperature of the upper high temperature region in the heat insulation plate 2 is controlled more effectively, the circumferentially arranged air inlet holes may be distributed in at least two rows along the height direction.

Further, the side edge of the heat insulation board 2 is in butt joint with the inner wall of the frame 11 in a sealing connection manner. The sealing connection mode is as follows: the side of the heat insulating board 2 is provided with a bending part, the bending part is provided with an end part deviating from the heat insulating board 2, and the end part is attached to the inner wall of the frame 11. When the sealing mode is that the bending part is arranged on the side edge of the heat insulation plate 2 and the heat insulation plate 2 is attached through the bending part, the process is simple on the whole, the manufacturing cost is low, the installation is convenient, and the reliable plugging effect is achieved. Of course, the sealing connection is not limited to the above examples, and other modifications are possible by those skilled in the art in light of the technical spirit of the present application, but all the functions and effects of the sealing connection are the same as or similar to those of the present application, and are included in the protection scope of the present application.

When the lower end and the side edge of the heat insulation plate 2 are in butt joint with the inner wall of the frame 11 in a sealing connection manner, a blocking structure is formed between the lower end and the side edge of the heat insulation plate 2 and the frame 11. After the lower end and the side edges of the heat insulation plate 2 are in butt joint with the frame 11 to form a plugging structure, air entering from the air passing part 5 basically does not enter a gap between the heat insulation plate 2 and the frame 11, and further, the air is prevented from being mixed with cold air entering from the air inlet part 10, so that the cold air entering from the air inlet part 10 is better ensured to achieve a better cooling effect on the upper part of the heat insulation plate 2.

In one embodiment, the frame 11 may include opposite first and second side walls 111 and 112 and opposite third and fourth side walls 113 and 114, each of which is provided with the heat insulation board 2.

In the present embodiment, the frame 11 may be a frame-shaped frame having two open ends and formed by surrounding four side walls. Wherein, each side wall can be correspondingly provided with the heat insulation plate 2 so as to ensure that the temperature of each part of the whole frame 11 is not over-temperature. Specifically, the first side wall 111 of the frame 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 integrally formed. Accordingly, the heat insulation board 2 corresponding to the second side wall 112, the third side wall 113 and the fourth side wall 114 is also of an integral structure. Specifically, the integral structure can be formed by bending the same plate twice at a preset position, so that on one hand, the sealing performance of the frame body formed by bending is better, and on the other hand, the process is simple and the manufacturing cost is lower.

The above-mentioned three-sided integrated structure corresponds to a first side wall 111 mounted in cooperation with the first side wall, and a mounting opening is formed at a position of the first side wall, through which the burner 12 is mounted in the frame 11, and the first side wall 111 is then fixedly connected to the integrated structure, so that the mounting is convenient.

Referring to fig. 3, in one embodiment, the first side wall 111 is a mounting side wall, a limiting plate 6 is disposed between the second side wall 112 and the burner 12, and a flow guiding portion for circulating air is formed on the limiting plate 6.

In the present embodiment, the side wall opposite to the mounting side wall is a second side wall 112, and a limiting plate 6 is provided between the second side wall 112 and the burner 12. When the burner 12 is installed, the burner 12 enters the frame 11 through the installation opening of the first side wall 111 to be installed, and the burner 12 is in place when contacting the limiting plate 6. By arranging the limiting plate 6, the mounting process of the burner 12 can be simplified, and the accuracy and convenience of positioning the burner 12 are ensured.

The limiting plate 6 may be fixed to the frame 11 by a bolt connection or the like, and of course, the limiting plate 6 may be fixed to the frame 11 by other means, which is not limited herein. The limiting plate 6 is provided with a flow guide part for circulating air, when the fan 4 is started, the outside air can flow upwards through the flow guide part of the limiting plate 6 and flow to the heat insulation plate 2, so that the heat insulation plate 2 is cooled.

Specifically, the limiting plate 6 has a plate-shaped body, and the plate-shaped body has a first surface and a second surface opposite to each other, and grooves are disposed on the first surface and the second surface at intervals to form the flow guiding portion.

In this embodiment, the flow guiding portion on the limiting plate 6 may be formed by arranging through grooves on the first surface and the second surface of the limiting plate 6 at intervals. The sum of the depth of the recess and the thickness of the body is equal to the distance between the frame 11 and the burner 12. Specifically, the groove may be a through rectangular groove formed from the lower end of the limiting plate 6 to the upper end of the limiting plate 6. Of course, the form of the groove or the form of the flow guiding portion is not limited to the above examples, and other modifications are possible by those skilled in the art in light of the technical spirit of the present application, but all the functions and effects of the present application are the same or similar to those of the present application, and are included in the protection scope of the present application.

In addition, the limiting plate 6 may further include two flat plates spaced apart by a predetermined distance, the two flat plates may be fixedly connected through a connecting portion, and a gap between two adjacent connecting portions forms a flow guiding portion. Of course, the specific form of the limiting plate 6 is not limited to the above example, and the present application is not limited thereto.

Referring to fig. 6, in one embodiment, the heat insulation board 2 has opposite upper and lower ends, the heat insulation board 2 is provided with a step portion 21 near the upper end, the step portion 21 is provided with at least one open slot 20, and air flowing between the heat insulation board 2 and the frame 11 can flow out of the open slot 20.

In this embodiment, the heat shield 2 has an upper end relatively close to the heat exchanger 3 and a lower end close to the burner 12. The heat insulating plate 2 is provided with a step portion 21 near an upper end thereof, and the step portion 21 is provided with at least one open groove 20 for exhausting air. When the fan 4 is started, air entering between the heat insulation plate 2 and the frame 11 from the air inlet 10 flows upward and flows out through the open slot 20.

Specifically, the number of the open grooves 20 may be one or more, and the present application is not limited thereto. For example, when the number of the open slots 20 is one, the open slots may be formed as a single elongated rectangular opening, and extend in the same direction along the extending direction of the side wall of the frame 11. For example, when the number of the open grooves 20 is plural, the open grooves may include plural rectangular openings arranged at intervals along the extending direction of the side wall of the frame 11.

The step portion 21 may be formed by bending the heat insulation board 2 at a position near the upper end thereof, and of course, the step portion 21 may be formed by other means, which is not particularly limited herein. The angle of the bending may be 90 degrees, or may be an obtuse angle, and the present application is not particularly limited herein. When the air after heat exchange with the heat insulation plate 2 and the frame 11 flows out from the open slot 20 on the step part 21, a protective air flow can be formed near the open slot 20, and the high-temperature flue gas is blocked by the air flow and cannot directly contact with the part of the heat insulation plate 2, so that a certain cooling effect is generated on the heat insulation plate 2, and the temperature of the heat insulation plate is prevented from being overhigh.

Further, at least a portion of the heat insulating plate 2 between the step 21 and the upper end is attached to the inner wall of the housing 11.

In this embodiment, the heat insulation board 2 may be provided with an extension portion above the step portion 21, and the extension portion may be partially or entirely attached to the inner wall of the frame 11, so that on one hand, air entering from the air inlet portion 10 may be guided to flow out of the open slot 20, and on the other hand, an excessive temperature on the upper portion of the heat insulation board 2 may be transferred to the frame 11, so as to avoid premature rejection of the heat insulation board 2 due to an excessive local temperature.

Specifically, the distance from the stepped portion 21 to the upper end of the heat insulation board 2 may be less than 10 cm. In the whole, the step portion 21 is located near the upper end of the heat insulating plate 2, and the heat insulating plate 2 is provided with a bonding section bonded to the inside of the frame 11 at the upper portion of the step portion 21, and the bonding section is not too high in height, because if too high, the cool air entering from the air inlet portion 10 cannot contact the bonding section, and cannot be cooled. In summary, the installation position of the step portion 21 is to ensure that the temperature in the entire heat insulation plate 2 and the frame 11 facing the heat insulation plate 2 can be effectively controlled. Of course, in practical application, those skilled in the art can further refine the numerical range, and the present application is not limited thereto.

In one embodiment, a flow guiding member is disposed between the heat insulating plate 2 and the inner wall of the frame 11, and the flow guiding member cooperates with the heat insulating plate 2 and the frame 11 to form a predetermined sealed flow path, and the gas flows in from the gas inlet portion 10, flows through the sealed flow path in a predetermined flow direction, and flows out from the open slot 20.

In this embodiment, a flow guiding component may be disposed between the heat insulating plate 2 and the inner wall of the frame 11, and the flow guiding component may be matched with the heat insulating plate 2 and the frame 11, so as to partition a gap between the heat insulating plate 2 and the frame 11, thereby forming a predetermined sealed flow path. The sealing flow passage has an inlet end and an outlet end opposite to each other, wherein the inlet end can be directly connected with the air inlet portion 10 or the inlet end is the air inlet portion 10, and the outlet end can be directly connected with the open slot 20 or the outlet end is the open slot 20. When the fan 4 is started, the air flows in from the air inlet part 10, flows through the sealing flow passage according to a preset flow direction and flows out from the open slot 20, so that the contact time between the air and the upper part of the heat insulation plate 2 can be prolonged, the entering cold air can exchange heat with the middle and upper part of the heat insulation plate 2 sufficiently, and the middle and upper part of the heat insulation plate 2 is ensured not to be overheated.

Specifically, the flow guiding member may be in the form of one or more partitions, which divide the gap between the heat insulating plate 2 and the frame 11 to form a circuitous flow path. Of course, the specific form of the flow guiding member is not limited to the above example, and the corresponding form of forming the sealing flow passage is not limited to the above example, and the present application is not limited thereto.

In one embodiment, the heat insulation board 2 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 board 2 are respectively attached to the inner wall of the frame 11 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 board 2 to the air inlet 10.

In this embodiment, the lower end of the heat insulation board 2 is attached to the inner wall of the frame 11 to form a blocking structure, and in addition, the left side end or the right side end of the heat insulation board 2 is attached to the inner wall of the frame 11 from the lower end to a predetermined height to form a lower end blocking mechanism. The predetermined height is not less than the distance from the lower end of the heat insulating plate 2 to the air inlet 10. That is, the left and right sides of the heat shield plate 2 are formed with side blocking structures at least from the lower end to the position of the air inlet 10 and between the inner wall of the frame 11. The lower end blocking structure is matched with the side blocking structure and is used for ensuring that air entering from the air passing portion 5 cannot enter a gap between the partition plate and the frame 11, so that the cooling effect of cold air entering from the air inlet portion 10 on the heat insulation plate 2 and the frame 11 is reduced. Generally, when the outside air enters the frame 11 through the air passing portion 5, and is guided to the heat insulation plate 2, the outside air diverges as the flow path increases and the temperature increases, and flows to the height of the air intake portion 10, the air flow is small, and the air entering from the air intake portion 10 is not greatly affected.

In summary, in the gas water heater according to the embodiment of the present application, the air inlet portion 10 is disposed on the frame 11 provided with the heat insulation plate 2, the air passing portion 5 is formed between the burner 12 and at least part of the frame 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 11 to form a first cooling air flow, and the air flowing from the air passing portion 5 flows into the heat insulation plate 2 to form a second cooling air flow, so that the temperatures of the heat insulation plate 2 and the frame 11 are effectively controlled under the mutual cooperation of the two air flows. Particularly for the heat insulation board 2, the air introduced by the air passing portion 5 can cool the lower portion of the heat insulation board 2, so that the position of the air inlet portion 10 can be adjusted upwards, compared with the existing cooling structure, the air flow can be greatly shortened, the air with lower temperature can perform concentrated heat exchange with the area with higher temperature on the upper portion of the heat insulation board 2, and the temperature of the whole heat insulation board 2 is ensured to be effectively controlled.

The foregoing embodiments in the present specification are all described in a progressive manner, and the same and similar parts of the embodiments are mutually referred to, and each embodiment is mainly described in a different manner from other embodiments.

The foregoing description of the embodiments of the present invention is merely illustrative, and the present invention is not limited to the embodiments described above. Any person skilled in the art can make any modification and variation in form and detail of the embodiments without departing from the spirit and scope of the present disclosure, but the scope of the present disclosure is still subject to the scope of the appended claims.

Claims

1. The utility model provides a gas water heater, gas water heater includes burner, heat exchanger and the fan that sets gradually from bottom to top, its characterized in that:

the combustion device comprises a frame body and a combustor, wherein the combustor is used for mixing fuel gas and air and then combusting the fuel gas and the air, the combustor comprises a plurality of fire rows which are arranged in parallel, and an air passing part is formed between the combustor and the frame body;

a heat insulation plate is arranged in the frame body at a preset distance from the inner wall of the frame body, and the heat insulation plate is provided with a first surface and a second surface which are opposite; the second surface is arranged opposite to the inner wall of the frame body; an air inlet part is arranged on the frame body;

When the fan is started, air entering from the air inlet part flows into the space between the heat insulation plate and the frame body, and the air flowing into the space between the heat insulation plate and the frame body can flow through at least part of the second surface; the lower part of the frame body is communicated with the external atmosphere, and the external air entering from the lower part of the frame body enters the burner; part of the air enters an air passing portion between the burner and the frame, and air flowing in from the air passing portion can flow through at least part of the first surface.

2. The gas water heating apparatus as recited in claim 1, wherein said fan is a variable frequency fan.

3. A gas water heating apparatus as claimed in claim 1 or claim 2, wherein the heat shield has opposite upper and lower ends, the lower end of the heat shield abutting the inner wall of the housing.

4. A gas water heating apparatus as claimed in claim 3, wherein the side edges of the heat shield are in abutment with the inner wall of the housing.

5. The gas water heating apparatus as claimed in claim 4, wherein the docking means is: the lower end and/or the side of the heat insulating plate are/is provided with a bending part, the bending part is provided with an end part deviating from the heat insulating plate, and the end part is attached to the inner wall of the frame body.

6. The gas water heating apparatus as recited in claim 4, wherein the frame includes opposing first and second side walls and opposing third and fourth side walls, each side wall being correspondingly provided with the heat shield.

7. The gas water heating apparatus as recited in claim 6, wherein said two side walls, said third side wall and said fourth side wall are of unitary construction, and wherein heat shields corresponding to said second side wall, said third side wall and said fourth side wall are of unitary construction.

8. The gas water heater as set forth in claim 6, wherein a limiting plate is provided between the second side wall and the burner, and a flow guide portion for circulating air is formed on the limiting plate.

9. The gas water heating apparatus as claimed in claim 2, wherein the heat shield has opposite upper and lower ends, the heat shield being provided with a stepped portion near the upper end, the stepped portion being provided with at least one open groove, and air flowing between the heat shield and the frame can flow out of the open groove.

10. The gas water heating apparatus as claimed in claim 9, wherein the distance from the stepped portion to the upper end of the heat shield is less than 10 cm.

11. The gas water heating apparatus as claimed in claim 9, wherein at least a portion of the heat shield between the step portion and the upper end is fitted to an inner wall of the housing.

12. The gas water heater as set forth in claim 9, wherein a flow guide member is provided between the heat shield and the inner wall of the frame, the flow guide member and the heat shield being engaged with the frame to form a predetermined sealed flow path, and the gas flowing in from the gas inlet portion flows through the sealed flow path in a predetermined flow direction and then flows out from the open slot.

13. The gas water heating apparatus as claimed in claim 4, wherein the heat shield has opposite upper and lower ends and opposite left and right ends, the lower end of the heat shield, and the left and right ends respectively engage with the inner wall of the housing from the lower end to a predetermined height, wherein the predetermined height is not less than a distance from the lower end of the heat shield to the air inlet.

14. The gas water heating apparatus as recited in claim 1, wherein the air passing portion is formed by a gap between the burner and the frame.