Cooling circulation system, sealing structure for water tank cover and its working method

Abstract

This invention belongs to the field of sealing technology, specifically relating to a sealing structure for a cooling water tank inlet, and more particularly to a cooling circulation system, a sealing structure for a water tank cover, and its working method. The sealing structure for the water tank cover includes: a water tank body; a sealing cover; wherein the sealing cover includes: an elastic cavity on the bottom surface of the cover body; an elastic arc-shaped abutment ring extending outward from the lower part of the connection between the elastic cavity and the cover body; and a sealing ring fitted onto the outer wall of the elastic cavity, with the inner diameter of the sealing ring being smaller than the diameter of the bottom of the outer ring of the elastic arc-shaped abutment ring. By providing an elastic cavity and an elastic arc-shaped abutment ring below the sealing cover, when the cover body is removed from the inlet, the sealing ring deforms outward and fits onto the outer wall of the inlet pipe, thus lowering the height of the sealing ring below the height of the inlet, thereby preventing debris from entering the inlet.

Description

Technical Field

[0001] This invention belongs to the field of sealing technology, specifically relating to a sealing structure for the inlet of a cooling water tank, and more particularly to a sealing structure for a cooling circulation system and a water tank cover, and its working method. Background Technology

[0002] As the main protective measure for the water tank inlet, the sealing cover needs to be removed when the cooling water is replaced.

[0003] In related technologies, the sealing cover seals the water inlet with a sealing ring. However, the area around the sealing ring is not effectively protected, making it easy for debris and impurities to accumulate. When the sealing cover is disassembled, the impurities accumulated around the sealing ring can easily fall into the liquid inlet. On the one hand, the entry of impurities will contaminate the cooling medium, leading to poor heat dissipation of the diesel engine. On the other hand, the entry of impurities will cause wear and tear on equipment such as water pumps, shortening the service life of the cooling system.

[0004] Therefore, how to reduce the amount of impurities attached to the sealing ring entering the water inlet when the sealing cover is disassembled is a technical problem that urgently needs to be solved.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one cooling circulation system, a sealing structure for a water tank cover, and a method for operating the same.

[0007] In a first aspect, embodiments of this disclosure provide a sealing structure for a water tank cover, comprising: The water tank body is equipped with a liquid inlet; A sealing cap that snaps onto the liquid inlet; The sealing cover includes: The cover body has a connecting shaft extending downwards from its middle section; A two-way check valve is sleeved on the connecting shaft and elastically connected to the cover body via a return spring; An elastic cavity is provided on the bottom surface of the cover body; An elastic arc-shaped abutment ring extends outward from the lower direction at the connection between the elastic cavity and the cover body; A sealing ring is fitted onto the outer wall of the elastic cavity, and the inner diameter of the sealing ring is smaller than the diameter of the bottom of the outer ring of the elastic arc-shaped support ring. When the cover body is closed on the liquid inlet, the sealing ring is held against the tube body of the liquid inlet and moves upward along the elastic arc-shaped holding ring to seal the liquid inlet and the cover body. When the cover body is removed from the liquid inlet, the elastic arc-shaped retaining ring deforms outward to move the sealing ring downward and fit onto the outer wall of the tube body of the liquid inlet, so as to prevent debris on the sealing ring from entering the liquid inlet.

[0008] In one alternative embodiment, the top surface of the elastic arc-shaped abutment ring abuts against the bottom surface of the cover body; Furthermore, the diameter of the top outer ring of the elastic arc-shaped support ring is larger than the diameter of the liquid inlet.

[0009] In one optional embodiment, the outer wall of the inlet tube is tapered; When the cover body is removed from the liquid inlet, the elastic arc-shaped retaining ring deforms outward to push the sealing ring outward and fit onto the tube body of the liquid inlet.

[0010] In one alternative embodiment, the elastic cavity includes: The base plate is fixedly mounted on the outer wall of the bidirectional check valve; An elastic arc-shaped connecting ring is connected to both the cover body and the bottom plate. When the cover body is closed on the liquid inlet and the bidirectional one-way valve abuts against the support plate of the liquid inlet, the cover body continues to press down, thereby squeezing the elastic cavity, causing the elastic arc-shaped connecting ring to deform in the direction of the shape, and enhancing the abutment force between the elastic cavity and the inner wall of the liquid inlet tube.

[0011] In one alternative embodiment, the bidirectional check valve includes: The first one-way valve is sleeved on the connecting shaft of the cover body; The second check valve is located at the bottom of the first check valve; The base plate is fixedly connected to the side wall of the first one-way valve; The top of the first one-way valve is sleeved on the connecting shaft and is slidably connected to the connecting shaft.

[0012] In one alternative embodiment, the first check valve includes: The sleeve has a sealing ring extending radially outward from its bottom; A plug is fixedly disposed below the sealing ring; Wherein, the outer diameter of the sealing ring is larger than the aperture of the abutment plate; The diameter of the block is adapted to the aperture of the abutment plate.

[0013] In one optional embodiment, the bottom of the block has an installation opening; The second check valve is disposed within the mounting port.

[0014] In one alternative embodiment, the second check valve includes: A cover plate is installed and fixedly disposed within the mounting opening; A limiting plate is disposed above the mounting cover plate; A sealing plate, which is slidably disposed within the mounting cover plate; The limiting plate and the sealing plate are connected by a shaft; A compression spring is fitted onto the shaft. One end of the compression spring is connected to the limiting plate, and the other end is connected to the top surface of the mounting cover plate.

[0015] Secondly, embodiments of this disclosure also provide a cooling circulation system for cooling a diesel engine, comprising: A water tank, which includes a sealing structure for a water tank cover as described above; The liquid cooling pipeline is connected to the water pump of the external diesel engine; The auxiliary water tank is connected to the liquid inlet via a connecting pipe, and the interface is located above the two-way one-way valve.

[0016] Thirdly, this disclosure also provides a method for operating a water tank cover with the sealing structure described above, the method comprising: During installation, the sealing ring is fitted onto the elastic cavity; Insert the cap body into the liquid inlet so that the sealing ring is held against the tube body of the liquid inlet and moves upward along the elastic arc-shaped holding ring; During disassembly, pull the cap body out of the liquid inlet; When pulled out, the elastic arc-shaped retaining ring returns to its original shape outward, causing the sealing ring to move downward and fit onto the outer wall of the tube body at the inlet.

[0017] The beneficial effects of this invention are that the cooling circulation system, the sealing structure for the water tank cover and its working method, by setting an elastic cavity and an elastic arc-shaped support ring below the sealing cover, when the cover body is removed from the liquid inlet, the sealing ring is deformed outward and fitted onto the outer wall of the pipe body of the liquid inlet, so that the height of the sealing ring is lower than the height of the liquid inlet, thereby preventing foreign matter from entering the liquid inlet.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of a sealing structure for a water tank cover provided in an embodiment of this disclosure; Figure 2 A cross-sectional view of a portion of the sealing structure for a water tank cover provided in an embodiment of this disclosure; Figure 3 A cross-sectional view of the sealing cover provided in an embodiment of this disclosure; Figure 4 This is a schematic diagram of the cooling circulation system provided in an embodiment of the present disclosure; Figure 5 A flowchart illustrating the working method of the sealing structure for the water tank cover provided in this embodiment.

[0022] In the diagram: 100, Water tank body; 110, Liquid inlet; 120, Pipe body; 200, Sealing cover; 210, Cover body; 220, Connecting shaft; 230, Two-way check valve; 231, First check valve; 2311, Sleeve; 2312, Sealing ring; 2313, Plug; 2314, Mounting port; 232, Second check valve; 2321, Mounting cover plate; 2322, Limiting plate; 2323, Sealing plate; 2324, Shaft body; 2325, Compression spring; 240, Elastic cavity; 241, Elastic arc-shaped support ring; 242, Base plate; 243, Elastic arc-shaped connecting ring; 250, Sealing ring; 260, Return spring; 300, Water tank; 400, Liquid cooling pipeline; 510, Connecting pipe; 600, Diesel engine. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0025] In this document, when an element or layer is referred to as “located,” “joined to,” “connected to,” “attached to,” or “coupled to” another element or layer, it may be directly located, joined, connected, attached to, or coupled to the other element or layer, or there may be intermediate elements or layers present. Conversely, when an element is referred to as “directly on another element or layer,” “directly joined to,” “directly connected to,” “directly attached to,” or “directly coupled to” another element or layer, there may be no intermediate elements or layers present. Other terms used to describe relationships between elements should be interpreted in a similar manner (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items.

[0026] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0027] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0028] Research has revealed that the sealing cover seals the water inlet with a sealing ring, but the area around the sealing ring is not effectively protected, making it easy for debris and impurities to accumulate. When the sealing cover is disassembled, the impurities accumulated around the sealing ring can easily fall into the water inlet. On the one hand, the entry of impurities will contaminate the cooling medium, leading to poor heat dissipation of the diesel engine. On the other hand, the entry of impurities will cause wear and tear on equipment such as water pumps, shortening the service life of the cooling system.

[0029] Based on the above research, this disclosure provides a cooling circulation system, a sealing structure for a water tank cover, and its working method. By providing an elastic cavity 240 and an elastic arc-shaped support ring 241 below the sealing cover 200, when the cover body 210 is removed from the liquid inlet 110, the sealing ring 250 is deformed outward and fitted onto the outer wall of the tube body 120 of the liquid inlet 110, thereby making the height of the sealing ring 250 lower than the height of the liquid inlet 110, thus preventing debris from entering the liquid inlet 110.

[0030] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventor's contribution to this disclosure.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] Please see Figure 1 and Figure 2At least one embodiment provides a sealing structure for a water tank cover, comprising: a water tank body 100 having a liquid inlet 110; a sealing cover 200 fastened to the liquid inlet 110; wherein the sealing cover 200 includes: a cover body 210 with a connecting shaft 220 extending downward from its middle portion; a bidirectional one-way valve 230 sleeved on the connecting shaft 220 and elastically connected to the cover body 210 via a return spring 260; an elastic cavity 240 provided on the bottom surface of the cover body 210; an elastic arc-shaped retaining ring 241 extending outward from the lower part of the connection between the elastic cavity 240 and the cover body 210; and a sealing ring 250 sleeved on the elastic... On the outer wall of the cavity 240, the inner diameter of the sealing ring 250 is smaller than the diameter of the bottom of the outer ring of the elastic arc-shaped abutment ring 241; when the cover body 210 covers the liquid inlet 110, the sealing ring 250 is held by the tube body 120 of the liquid inlet 110 and moves upward along the elastic arc-shaped abutment ring 241 to seal the liquid inlet 110 and the cover body 210; when the cover body 210 is removed from the liquid inlet 110, the elastic arc-shaped abutment ring 241 deforms outward to make the sealing ring 250 move downward and fit on the outer wall of the tube body 120 of the liquid inlet 110 to prevent debris on the sealing ring 250 from entering the liquid inlet 110.

[0034] By providing an elastic cavity 240 and an elastic arc-shaped retaining ring 241 below the sealing cover 200, when the cover body 210 is removed from the liquid inlet 110, the sealing ring 250 is deformed outward and fitted onto the outer wall of the tube body 120 of the liquid inlet 110, so that the height of the sealing ring 250 is lower than the height of the liquid inlet 110, thereby preventing foreign matter from entering the liquid inlet 110.

[0035] Please see Figure 2 and Figure 3 The top surface of the elastic arc-shaped abutment ring 241 abuts against the bottom surface of the cover body 210; and the outer diameter of the top ring of the elastic arc-shaped abutment ring 241 is larger than the diameter of the liquid inlet 110.

[0036] When the cover body 210 is closed on the liquid inlet 110, the liquid inlet 110 squeezes the elastic arc-shaped support ring 241, causing the elastic arc-shaped support ring 241 to contract inward towards its top surface. This facilitates the subsequent disassembly by pushing the sealing ring 250 outward. At the same time, it can also prevent debris accumulated on the sealing ring 250 from entering the liquid inlet 110.

[0037] It should be noted that, in order to facilitate the sealing ring 250 being fitted onto the tube body 120, the outer wall of the tube body 120 of the liquid inlet 110 is constricted; when the cap body 210 is removed from the liquid inlet 110, the elastic arc-shaped support ring 241 deforms outward to push the sealing ring 250 outward and fit it onto the tube body 120 of the liquid inlet 110.

[0038] Please see Figure 2 and Figure 3 The elastic cavity 240 includes: a base plate 242, which is fixedly disposed on the outer side wall of the bidirectional one-way valve 230; and an elastic arc-shaped connecting ring 243, which is connected to the cover body 210 and the base plate 242 respectively. When the cover body 210 covers the liquid inlet 110 and the bidirectional one-way valve 230 abuts against the abutment plate of the liquid inlet 110, the cover body 210 continues to press down, thereby squeezing the elastic cavity 240, causing the elastic arc-shaped connecting ring 243 to deform outward, thereby enhancing the abutment force between the elastic cavity 240 and the inner wall of the tube body 120 of the liquid inlet 110.

[0039] When the cover body 210 is installed, the elastic cavity 240 is squeezed, and the elastic arc-shaped connecting ring 243 deforms outward, which increases the resistance between the elastic cavity 240 and the inner wall of the inlet 110 tube 120, thereby achieving a secondary seal and further enhancing the sealing force of the sealing cover 200.

[0040] Please see Figure 2 and Figure 3 The bidirectional one-way valve 230 includes: a first one-way valve 231, which is sleeved on the connecting shaft 220 of the cover body; a second one-way valve 232, which is disposed at the bottom of the first one-way valve 231; the base plate 242 is fixedly connected to the side wall of the first one-way valve 231; the top of the first one-way valve 231 is sleeved on the connecting shaft 220 and slidably connected to the connecting shaft 220.

[0041] Specifically, the first one-way valve 231 includes: a sleeve 2311, from which a sealing ring 2312 extends radially outward; and a plug 2313, which is fixedly disposed below the sealing ring 2312; wherein the outer diameter of the sealing ring 2312 is larger than the aperture of the abutment plate; and the diameter of the plug 2313 is adapted to the aperture of the abutment plate.

[0042] When the coolant in the water tank body 100 expands due to heat, the push sealing ring 2312 moves upward, opening the first one-way valve 231, allowing the liquid to enter the auxiliary water tank 300 from the connecting pipe 510 to complete the pressure relief.

[0043] Please see Figure 3The bottom of the block 2313 is provided with an installation port 2314; the second one-way valve 232 is disposed in the installation port 2314.

[0044] Specifically, the second one-way valve 232 includes: a mounting cover plate 2321, which is fixedly disposed within the mounting port 2314; a limiting plate 2322, which is disposed above the mounting cover plate 2321; and a sealing plate 2323, which is slidably disposed within the mounting cover plate 2321; the limiting plate 2322 and the sealing plate 2323 are connected by a shaft 2324; a compression spring 2325 is sleeved on the shaft 2324; one end of the compression spring 2325 is connected to the limiting plate 2322, and the other end is connected to the top surface of the mounting cover plate 2321.

[0045] The sleeve 2311 has a return port on its side wall. After the coolant in the water tank body 100 is cooled, the coolant in the auxiliary water tank 300 flows into the sleeve 2311 through the return port, squeezing the sealing plate 2323 and causing the sealing plate 2323 to move downward, releasing the seal between the sealing plate 2323 and the mounting cover plate 2321, so that the liquid in the auxiliary water tank 300 flows back into the water tank body 100.

[0046] Please see Figure 4 At least one embodiment also provides a cooling circulation system for cooling a diesel engine 600, comprising: a water tank 300, including a water tank cover sealing structure as described above; a liquid cooling pipeline 400 connected to an external water pump of the diesel engine 600; and an auxiliary water tank 300 connected to the liquid inlet 110 via a connecting pipe 510, with the interface located above a two-way one-way valve 230. By providing an elastic cavity 240 and an elastic arc-shaped retaining ring 241 below the sealing cover 200, when the cover body 210 is removed from the liquid inlet 110, the sealing ring 250 deforms outward and is fitted onto the outer wall of the pipe body 120 of the liquid inlet 110, thereby reducing the height of the sealing ring 250 to below the height of the liquid inlet 110 and preventing debris from entering the liquid inlet 110.

[0047] Please see Figure 5 This disclosure also provides a working method for a water tank cover sealing structure as described above. By providing an elastic cavity 240 and an elastic arc-shaped support ring 241 below the sealing cover 200, when the cover body 210 is removed from the liquid inlet 110, the sealing ring 250 is deformed outward and fitted onto the outer wall of the tube body 120 of the liquid inlet 110, so that the height of the sealing ring 250 is lower than the height of the liquid inlet 110, thereby preventing debris from entering the liquid inlet 110.

[0048] Specifically, the working method includes: S110: During installation, the sealing ring 250 is fitted onto the elastic cavity 240; S120: Insert the cap body 210 into the liquid inlet 110 so that the sealing ring 250 is held by the tube body 120 of the liquid inlet 110 and moves upward along the elastic arc-shaped holding ring 241. S130: When disassembling, pull the cover body 210 out from the liquid inlet 110; S140: When pulled out, the elastic arc-shaped retaining ring 241 returns to its original shape outward, so that the sealing ring 250 moves downward and is fitted onto the outer wall of the tube body 120 of the liquid inlet 110.

[0049] In summary, this invention provides a cooling circulation system, a sealing structure for a water tank cover, and a method for operating the same. The sealing structure for the water tank cover includes: a water tank body 100 with an inlet 110; and a sealing cover 200 that engages with the inlet 110. The sealing cover 200 includes: a cover body 210 with a connecting shaft 220 extending downwards from its middle portion; a bidirectional one-way valve 230 fitted onto the connecting shaft 220 and elastically connected to the cover body 210 via a return spring 260; an elastic cavity 240 on the bottom surface of the cover body 210; and an elastic arc-shaped retaining ring 241 extending outwards from the lower part of the connection between the elastic cavity 240 and the cover body 210. A sealing ring 250 is fitted onto the outer wall of the elastic cavity 240, and the inner diameter of the sealing ring 250 is smaller than the diameter of the bottom of the outer ring of the elastic arc-shaped support ring 241. When the cover body 210 is closed onto the liquid inlet 110, the sealing ring 250 is supported by the tube body 120 of the liquid inlet 110 and moves upward along the elastic arc-shaped support ring 241 to seal the liquid inlet 110 and the cover body 210. When the cover body 210 is removed from the liquid inlet 110, the elastic arc-shaped support ring 241 deforms outward to allow the sealing ring 250 to move downward and fit onto the outer wall of the tube body 120 of the liquid inlet 110, so as to prevent debris on the sealing ring 250 from entering the liquid inlet 110. By providing an elastic cavity 240 and an elastic arc-shaped retaining ring 241 below the sealing cover 200, when the cover body 210 is removed from the liquid inlet 110, the sealing ring 250 is deformed outward and fitted onto the outer wall of the tube body 120 of the liquid inlet 110, so that the height of the sealing ring 250 is lower than the height of the liquid inlet 110, thereby preventing foreign matter from entering the liquid inlet 110.

[0050] In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention based on the specific circumstances.

[0051] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0052] Spatially relative terms, such as “inside,” “outside,” “below,” “below,” “down,” “above,” “up,” etc., may be used herein to describe the relationship between one element or feature illustrated in the figures and another element or feature. In addition to the orientations depicted in the figures, spatially relative terms may be intended to cover different orientations of the device in use or operation. For example, if the device in the figure is flipped, an element described as “below” or “below” other elements or features would be oriented as “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatially relative descriptors used herein are interpreted accordingly.

[0053] In the above discussion, unless otherwise stated, when used to describe numerical values, the terms “about,” “approximately,” “basically,” etc., indicate a change of + / - 10% in that value.

[0054] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A sealing structure for a water tank cover, characterized in that, include: The water tank body (100) is provided with a liquid inlet (110); A sealing cap (200) is fastened to the liquid inlet (110); The sealing cover (200) includes: The cover body (210) has a connecting shaft (220) extending downward from its middle part. A two-way check valve (230) is sleeved on the connecting shaft (220) and elastically connected to the cover body (210) via a return spring (260); The bottom surface of the cover body (210) is provided with an elastic cavity (240). An elastic arc-shaped abutment ring (241) extends outward from the lower direction at the connection between the elastic cavity (240) and the cover body (210). A sealing ring (250) is fitted on the outer wall of the elastic cavity (240), and the inner diameter of the sealing ring (250) is smaller than the diameter of the bottom of the outer ring of the elastic arc-shaped support ring (241). When the cover body (210) is closed on the liquid inlet (110), the sealing ring (250) is held against by the tube body (120) of the liquid inlet (110) and moves upward along the elastic arc-shaped holding ring (241) to seal the liquid inlet (110) and the cover body (210). When the cover body (210) is removed from the liquid inlet (110), the elastic arc-shaped support ring (241) deforms outward to allow the sealing ring (250) to move downward and fit onto the outer wall of the tube body (120) of the liquid inlet (110) to prevent debris on the sealing ring (250) from entering the liquid inlet (110); The top surface of the elastic arc-shaped abutting ring (241) abuts against the bottom surface of the cover body (210); Furthermore, the diameter of the top outer ring of the elastic arc-shaped support ring (241) is larger than the diameter of the liquid inlet (110); The outer wall of the tube body (120) of the liquid inlet (110) is constricted; When the cover body (210) is removed from the liquid inlet (110), the elastic arc-shaped support ring (241) deforms outward to push the sealing ring (250) outward and fit it onto the tube body (120) of the liquid inlet (110); The elastic cavity (240) includes: The base plate (242) is fixedly mounted on the outer wall of the bidirectional check valve (230); An elastic arc-shaped connecting ring (243) is connected to the cover body (210) and the bottom plate (242) respectively; When the cover body (210) covers the liquid inlet (110) and the bidirectional one-way valve (230) abuts against the abutment plate of the liquid inlet (110), the cover body (210) continues to press down, thereby squeezing the elastic cavity (240), causing the elastic arc-shaped connecting ring (243) to deform outward, and enhancing the abutment force between the elastic cavity (240) and the inner wall of the tube body (120) of the liquid inlet (110); The bidirectional check valve (230) includes: The first one-way valve (231) is sleeved on the connecting shaft (220) of the cover body; The second check valve (232) is disposed at the bottom of the first check valve (231); The base plate (242) is fixedly connected to the side wall of the first one-way valve (231); The top of the first one-way valve (231) is sleeved on the connecting shaft (220) and is slidably connected to the connecting shaft (220).

2. The sealing structure for the water tank cover as described in claim 1, characterized in that, The first check valve (231) includes: The sleeve (2311) has a sealing ring (2312) extending radially outward from its bottom. A plug (2313) is fixedly disposed below the sealing ring (2312); Wherein, the outer diameter of the sealing ring (2312) is larger than the aperture of the abutment plate; The diameter of the block (2313) is adapted to the aperture of the abutment plate.

3. The sealing structure for the water tank cover as described in claim 2, characterized in that, The bottom of the block (2313) is provided with an installation port (2314). The second check valve (232) is disposed in the mounting port (2314).

4. The sealing structure for the water tank cover as described in claim 3, characterized in that, The second check valve (232) includes: The cover plate (2321) is fixedly installed inside the mounting port (2314); A limiting plate (2322) is disposed above the mounting cover plate (2321); A sealing plate (2323) is slidably disposed within the mounting cover plate (2321); The limiting plate (2322) and the sealing plate (2323) are connected by a shaft (2324); A compression spring (2325) is sleeved on the shaft (2324); One end of the compression spring (2325) is connected to the limiting plate (2322), and the other end is connected to the top surface of the mounting cover plate (2321).

5. A cooling circulation system for cooling a diesel engine (600), characterized in that, include: A water tank (300) comprising a sealing structure for a water tank cover as described in any one of claims 1-4; The liquid cooling line (400) is connected to the water pump of the external diesel engine (600); The auxiliary water tank (300) is connected to the liquid inlet (110) via a connecting pipe (510), and the interface is located above the two-way check valve (230).

6. A method for operating a water tank cover using a sealing structure as described in any one of claims 1-4, characterized in that, The working method includes: During installation, the sealing ring (250) is fitted onto the elastic cavity (240); Insert the cap body (210) into the liquid inlet (110) so that the sealing ring (250) is held by the tube body (120) of the liquid inlet (110) and moves upward along the elastic arc-shaped holding ring (241); During disassembly, pull the cap body (210) out of the liquid inlet (110); When pulled out, the elastic arc-shaped retaining ring (241) deforms outward to allow the sealing ring (250) to move downward and fit onto the outer wall of the tube body (120) of the inlet (110).

Images