High-pressure hydrogen cylinder port sealing valve core and sealing valve

Abstract

The utility model provides a kind of high-pressure hydrogen bottle mouth sealing valve core and sealing valve, valve core includes: valve core body, the valve core body has oppositely arranged sealing surface and connecting surface;The sealing surface of the valve core body is provided with recess, the recess is provided with vulcanized rubber and vulcanized polytetrafluoroethylene gasket, the vulcanized rubber is arranged below the vulcanized polyethylene gasket, the vulcanized rubber and the vulcanized polyethylene gasket fill the recess.Upper end vulcanized polyethylene gasket effectively prevents hydrogen molecule penetration under high pressure state.Meanwhile can give product improves very good sealing effect, when being extruded under high pressure for a long time, also will not appear due to pressure and damaged problem.Recess inner lower part vulcanized rubber can provide very good rebound deformation to vulcanized polyethylene gasket even in low pressure process, prevent vulcanized polyethylene gasket and body sealing surface from not being close under low pressure state, improve sealing effect.

Description

Technical Field

[0001] This utility model belongs to the field of valves, specifically relating to a high-pressure hydrogen cylinder mouth sealing valve core and a sealing valve. Background Technology

[0002] The one-way valve core for gas cylinder openings is mainly used on valves at the cylinder openings of hydrogen-powered heavy trucks or hydrogen refueling stations, and its main function is to control the gas supply.

[0003] Utility model CN115199795B discloses a controllable one-way valve assembly for hydrogen transportation, relating to the field of intelligent gas transportation equipment technology, including a front valve assembly and a rear valve assembly; the front valve assembly includes a front valve body, a valve core, a first valve stem, a spring, a temperature sensor, a first sealing ring, and a stop block; the rear valve assembly includes a rear valve body, a servo electric cylinder, a first piston, a second piston, and a second valve stem, wherein the second valve stem is a high-temperature resistant brittle plastic rod.

[0004] The first sealing ring in utility model CN115199795B is made of rubber. Under high pressure (70MPa), the rubber will deform under high pressure, leading to leakage. Simultaneously, in a high-pressure hydrogen environment for an extended period, hydrogen molecules will penetrate into the spaces between rubber molecules, causing the rubber to swell. This results in the rubber product expanding, and due to size limitations, the valve core cannot fully open when the valve is opened. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of this utility model is to provide a high-pressure hydrogen cylinder mouth sealing valve core and sealing valve.

[0006] According to the present invention, a high-pressure hydrogen cylinder mouth sealing valve core includes: a valve core body, wherein the valve core body has a sealing surface and a connecting surface disposed opposite to each other; A groove is provided on the sealing surface of the valve core body. A vulcanized rubber and a vulcanized polytetrafluoroethylene gasket are provided in the groove. The vulcanized rubber is located below the vulcanized polyethylene gasket, and the vulcanized rubber and the vulcanized polyethylene gasket fill the groove. The valve core body is provided with a rubber venting and overflow hole, one end of which is connected to the bottom of the groove, and the other end is open to the outside.

[0007] Preferably, the valve core body around the groove is provided with four rubber venting and overflow holes.

[0008] Preferably, an adhesive is provided between the groove and the vulcanized rubber.

[0009] Preferably, the valve core body is a stainless steel iron part.

[0010] This utility model also provides a high-pressure hydrogen cylinder mouth sealing valve, which adopts the high-pressure hydrogen cylinder mouth sealing valve core described in any of the above-mentioned embodiments, and further includes: a valve body, a pressure applying component, and a valve stem; The high-pressure hydrogen cylinder mouth sealing valve core, pressure applying component, and valve stem are disposed in the valve body; The sealing surface of the high-pressure hydrogen cylinder valve core is connected to the valve stem, and the connecting surface is connected to the pressure-applying component. When the valve stem is pressed down, the force on the valve core sealing surface is greater than the force on the connecting surface, the sealing surface of the high-pressure hydrogen cylinder mouth sealing valve core separates from the valve body sealing surface of the valve body, and the high-pressure hydrogen cylinder mouth sealing valve opens. When the valve stem is not pressed down, the force on the sealing surface of the high-pressure hydrogen cylinder mouth sealing valve core is less than the force on the connecting surface, the sealing surface of the high-pressure hydrogen cylinder mouth sealing valve core is in close contact with the valve body sealing surface of the valve body, and the high-pressure hydrogen cylinder mouth sealing valve is closed.

[0011] Preferably, the pressure-applying element is a spring.

[0012] Preferably, an electromagnetic coil is provided on the valve stem, and the electromagnetic coil is used to drive the valve stem to rise or fall.

[0013] Compared with existing technologies, this utility model has the following advantages: A vulcanized polyethylene gasket and vulcanized rubber are arranged within the groove of the valve core body. The vulcanized polyethylene gasket at the upper end not only has tightly packed internal molecules, effectively preventing the penetration of hydrogen molecules under high pressure, but also possesses excellent mechanical properties, providing a superior sealing effect and preventing damage under prolonged high-pressure compression. Vulcanized rubber is located below the vulcanized polyethylene gasket in the lower part of the groove. Utilizing the high deformation and resilience of the vulcanized rubber, it provides excellent rebound deformation even under low pressure, preventing the vulcanized polyethylene gasket from not adhering tightly to the sealing surface under low pressure, thus improving the sealing effect. Furthermore, the use of rubber venting and overflow holes solves the problem of gas venting from the bottom of the groove during the vulcanization process and provides sufficient buffer space for the vulcanized polyethylene gasket under high pressure, preventing damage and significantly extending its lifespan. Attached Figure Description

[0014] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 A schematic diagram of the sealing valve core of a high-pressure hydrogen cylinder. Figure 2This is a partial structural diagram of the sealing valve at the mouth of a high-pressure hydrogen cylinder.

[0015] The diagram shows: Detailed Implementation

[0016] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0017] like Figure 1 As shown, this embodiment provides a high-pressure hydrogen cylinder mouth sealing valve core, including: valve core body 21, the valve core body 21 having a sealing surface 211 and a connecting surface 212 disposed opposite to each other; A groove 22 is provided on the sealing surface 211 of the valve core body 21. A vulcanized rubber 23 and a vulcanized polytetrafluoroethylene gasket 24 are provided in the groove 22. The vulcanized rubber 23 is located below the vulcanized polyethylene gasket 24, and the vulcanized rubber 23 and the vulcanized polyethylene gasket 24 fill the groove 22.

[0018] The valve core body 21 is provided with a rubber vent overflow hole 25. One end of the rubber vent overflow hole 25 is connected to the bottom of the groove 22, and the other end leads to the outside.

[0019] Four rubber venting and overflow holes 25 are provided on the valve core body 21 around the groove 22.

[0020] An adhesive is provided between the groove 22 and the vulcanized rubber 23.

[0021] The valve core body 21 is made of stainless steel.

[0022] like Figure 2 As shown, this embodiment also provides a high-pressure hydrogen cylinder mouth sealing valve, including: valve body 1, high-pressure hydrogen cylinder mouth sealing valve core 2, pressure applying element 3 and valve stem 4; The high-pressure hydrogen cylinder mouth sealing valve core 2 is any one of the high-pressure hydrogen cylinder mouth sealing valve cores 2 mentioned above. The high-pressure hydrogen cylinder mouth sealing valve core 2, the pressure applying element 3, and the valve stem 4 are installed inside the valve body 1; The sealing surface 211 of the high-pressure hydrogen cylinder mouth sealing valve core 2 is connected to the valve stem 4, and the connecting surface 212 is connected to the pressure application component 3; When the valve stem 4 is pressed down, the force on the valve core sealing surface 211 is greater than the force on the connecting surface 212, the sealing surface 211 of the high-pressure hydrogen cylinder mouth sealing valve core 2 separates from the valve body sealing surface 11 of the valve body 1, and the high-pressure hydrogen cylinder mouth sealing valve opens. When the valve stem 4 is not pressed down, the force on the sealing surface 211 of the high-pressure hydrogen bottle mouth sealing valve core 2 is less than the force on the connecting surface 212. The sealing surface 211 of the high-pressure hydrogen bottle mouth sealing valve core 2 is in close contact with the valve body sealing surface 11 of the valve body 1, and the high-pressure hydrogen bottle mouth sealing valve is closed.

[0023] The pressure-applying component 3 is a spring.

[0024] In one feasible embodiment, an electromagnetic coil is provided on the valve stem 4, which is used to drive the valve stem 4 to rise or fall.

[0025] By using a vulcanized polyethylene gasket 24 located at the top of the groove 22, the problem of rubber swelling caused by small-molecule hydrogen entering the rubber under 70MPa pressure can be solved, which leads to an increase in rubber size and prevents the valve core from opening. The dense internal structure of the vulcanized polyethylene gasket 24 can prevent the penetration of hydrogen molecules, and because of its high hardness, it will not cause leakage due to deformation under high pressure.

[0026] By using vulcanized rubber 23 at the bottom of the vulcanized polyethylene gasket 24, the problem of poor sealing performance of the vulcanized rubber 23 can be solved. Due to the poor elasticity of the vulcanized polyethylene gasket 24, if the entire groove 22 were filled with vulcanized polyethylene gasket 24, leakage would occur due to its poor elasticity. By placing vulcanized rubber 23 at the bottom of the groove 22, space is provided for the vulcanized polyethylene gasket 24 to deform. After the loss of external force, it can provide good rebound deformation, promptly and tightly fitting the vulcanized polyethylene gasket 24 to the sealing surface of the valve body 1, preventing leakage.

[0027] By employing rubber venting and overflow holes 25, the problem of gas venting from the bottom of the groove 22 during the rubber vulcanization process is solved. Furthermore, it provides sufficient buffer space for the vulcanized polyethylene gasket 24 under high pressure, preventing damage to the vulcanized polyethylene gasket 24. This significantly extends the lifespan of the vulcanized polyethylene gasket 24.

[0028] The vulcanized polyethylene gasket 24 at the upper end of the groove 22 of the valve core body 21 not only has tightly packed internal molecules, effectively preventing the penetration of hydrogen molecules under high pressure, but also possesses excellent mechanical properties, providing a good sealing effect and preventing damage due to pressure even under prolonged high-pressure compression.

[0029] Because the material is relatively hard, it does not fit tightly against the upper valve body sealing surface under low pressure, which can lead to leakage. Adding vulcanized rubber 23 below the vulcanized polyethylene gasket 24 utilizes the high deformation and resilience of the vulcanized rubber 23 to provide good rebound deformation for the vulcanized polyethylene gasket 24 even under low pressure, thus improving the sealing effect.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A high-pressure hydrogen cylinder nozzle sealing valve core, characterized in that, include: The valve core body (21) has a sealing surface (211) and a connecting surface (212) disposed opposite to each other. A groove (22) is provided on the sealing surface (211) of the valve core body (21). A vulcanized rubber (23) and a vulcanized polytetrafluoroethylene gasket (24) are provided in the groove (22). The vulcanized rubber (23) is located below the vulcanized polytetrafluoroethylene gasket (24). The vulcanized rubber (23) and the vulcanized polytetrafluoroethylene gasket (24) fill the groove (22). The valve core body (21) is provided with a rubber vent overflow hole (25), one end of which is connected to the bottom of the groove (22), and the other end is connected to the outside.

2. The high-pressure hydrogen cylinder sealing valve core according to claim 1, characterized in that, Four rubber venting and overflow holes (25) are provided on the valve core body (21) around the groove (22).

3. The high-pressure hydrogen cylinder mouth sealing valve core according to claim 1, characterized in that, An adhesive is provided between the groove (22) and the vulcanized rubber (23).

4. The high-pressure hydrogen cylinder sealing valve core according to claim 1, characterized in that, The valve core body (21) is made of stainless steel.

5. A high-pressure hydrogen cylinder mouth sealing valve, characterized in that, The high-pressure hydrogen cylinder mouth sealing valve core according to any one of claims 1 to 4 further includes: valve body (1), pressure application element (3) and valve stem (4). The high-pressure hydrogen cylinder mouth sealing valve core (2), pressure application component (3) and valve stem (4) are disposed inside the valve body (1); The sealing surface (211) of the high-pressure hydrogen cylinder mouth sealing valve core (2) is connected to the valve stem (4), and the connecting surface (212) is connected to the pressure application component (3); When the valve stem (4) is pressed down, the sealing surface (211) of the high-pressure hydrogen bottle mouth sealing valve core (2) separates from the valve body sealing surface (11) of the valve body (1), and the high-pressure hydrogen bottle mouth sealing valve opens. When the valve stem (4) is not pressed down, the sealing surface (211) of the high-pressure hydrogen bottle mouth sealing valve core (2) is in close contact with the valve body sealing surface (11) of the valve body (1), and the high-pressure hydrogen bottle mouth sealing valve is closed.

6. The high-pressure hydrogen cylinder sealing valve according to claim 5, characterized in that, The pressure-applying component (3) is a spring.

7. The high-pressure hydrogen cylinder mouth sealing valve according to claim 5, characterized in that, An electromagnetic coil is provided on the valve stem (4), which is used to drive the valve stem (4) to rise or fall.

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