Low pressure hydrogen cylinder port seal valve core and seal valve

Abstract

The utility model provides a kind of low pressure hydrogen gas bottle mouth sealing valve core and sealing valve, wherein, sealing 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 the vulcanized rubber fills the recess.The valve core body is provided with rubber exhaust overflow glue hole, one end of the rubber exhaust overflow glue hole is connected with the bottom of the recess, and the other end leads to outside.Vulcanize rubber in the recess of valve core body as a whole, on the one hand, increase the contact area of rubber and valve body sealing surface, improve sealing performance.On the other hand, there is no gap between vulcanized rubber and recess, avoid gas into vulcanized rubber and recess between, to avoid the problem that valve core sealing surface rises on vulcanized rubber when separating with valve body sealing surface, leading to valve cannot be opened.

Description

Technical Field

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

[0002] One-way valve cores for gas cylinder openings are mainly used on valves at the cylinder openings of hydrogen-powered heavy trucks or hydrogen refueling stations, primarily for controlling gas flow. Current products use rubber O-rings for sealing in low-pressure environments.

[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] In the first sealing ring of utility model CN115199795B, i.e., the valve core of the rubber O-ring product, in its natural state, the valve core is closed by the force applied by the bottom spring. After hydrogen is introduced, the hydrogen enters from the bottom, pushing the entire valve core upward. At this time, the valve core sealing surface and the rubber O-ring are tightly pressed against the upper valve body sealing surface, closing the valve. When it is necessary to open the valve, an external force is applied downward to the valve stem at the top by an electromagnetic coil, pressing the entire valve core down. This causes the valve core sealing surface and the rubber O-ring to separate from the upper valve body sealing surface. At this time, the gas at the bottom can pass through the gap between the valve core sealing surface and the valve body sealing surface, thereby opening the valve.

[0005] However, during gas flow, some gas pressure may cause it to enter the bottom of the rubber O-ring through the gap between the valve core and the rubber O-ring, thus lifting the rubber O-ring upwards and preventing it from separating from the valve body sealing surface. This results in incomplete gas passage and valve opening failure. Furthermore, the small contact area between the rubber O-ring and the valve body sealing surface leads to weak sealing performance. Utility Model Content

[0006] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a sealing valve core and sealing valve for medium and low pressure hydrogen cylinders.

[0007] According to the present invention, a sealing valve core for a medium-low pressure hydrogen cylinder includes: A valve core body, wherein the valve core body has a sealing surface and a connecting surface that are disposed opposite to each other; A groove is provided on the sealing surface of the valve core body, and vulcanized rubber is provided in the groove, and the vulcanized rubber fills 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.

[0008] Preferably, the valve core body around the groove is provided with four rubber venting and overflow holes.

[0009] Preferably, an adhesive is provided between the groove and the vulcanized rubber.

[0010] Preferably, the valve core body is a stainless steel iron part.

[0011] This utility model also provides a medium-low pressure hydrogen cylinder mouth sealing valve, which adopts the medium-low pressure hydrogen cylinder mouth sealing valve core described in any of the above-mentioned embodiments, and further includes: valve body, pressure application component and valve stem; The sealing valve core, pressure application component, and valve stem of the medium- and low-pressure hydrogen cylinder are disposed in the valve body; The sealing surface of the sealing valve core of the medium and low pressure hydrogen cylinder 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 sealing surface of the medium-low pressure hydrogen cylinder port sealing valve core separates from the valve body sealing surface of the valve body, and the medium-low pressure hydrogen cylinder port sealing valve opens. When the valve stem is not pressed down, the sealing surface of the medium-low pressure hydrogen cylinder port sealing valve core is in close contact with the valve body sealing surface of the valve body, and the medium-low pressure hydrogen cylinder port sealing valve is closed.

[0012] Preferably, the pressure-applying element is a spring.

[0013] 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.

[0014] Compared with existing technologies, this invention has the following advantages: Firstly, by vulcanizing the rubber integrally within the groove of the valve core body, the contact area between the rubber and the valve body sealing surface is increased, improving sealing performance. Secondly, the absence of gaps between the vulcanized rubber and the groove prevents gas from entering between them, thus avoiding the problem of the vulcanized rubber rising and preventing the valve from opening when the valve core sealing surface separates from the valve body sealing surface. Furthermore, by providing a rubber venting and overflow hole, even if the top of the groove becomes blocked during the rubber's flow into the groove, gas and excess rubber at the bottom of the groove can still be expelled through the groove, solving the problem of rubber separation caused by air trapped at the bottom during product manufacturing. Attached Figure Description

[0015] 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 This is a schematic diagram of the structure of the sealing valve core of a medium- and low-pressure hydrogen cylinder. Figure 2 This is a partial structural diagram of the sealing valve for a low-pressure hydrogen cylinder.

[0016] The diagram shows: Detailed Implementation

[0017] 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.

[0018] like Figure 1 As shown, this embodiment provides a sealing valve core for a medium-low pressure hydrogen cylinder, including: a 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, and vulcanized rubber 23 is provided in the groove 22, filling the groove 22 completely.

[0019] The valve core body 21 is provided with a rubber vent overflow hole 24. One end of the rubber vent overflow hole 24 is connected to the bottom of the groove 22, and the other end leads to the outside.

[0020] Four rubber venting and overflow holes 24 are provided on the valve core body 21 around the groove 22.

[0021] An adhesive is provided between the groove 22 and the vulcanized rubber 23.

[0022] The valve core body 21 is made of stainless steel.

[0023] like Figure 2 As shown, this embodiment also provides a medium-low pressure hydrogen cylinder mouth sealing valve, including: valve body 1, medium-low pressure hydrogen cylinder mouth sealing valve core 2, pressure applying component 3 and valve stem 4; The medium- and low-pressure hydrogen cylinder mouth sealing valve core 2 is any one of the above-mentioned medium- and low-pressure hydrogen cylinder mouth sealing valve cores 2; The sealing valve core 2, the pressure applying component 3, and the valve stem 4 of the medium and low pressure hydrogen cylinder are installed inside the valve body 1; The sealing surface 211 of the sealing valve core 2 of the medium and low pressure hydrogen cylinder 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 medium and low pressure hydrogen cylinder mouth sealing valve core 2 separates from the valve body 1, and the medium and low 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 medium and low pressure hydrogen cylinder mouth sealing valve core 2 is less than the force on the connecting surface 212. The sealing surface 211 of the medium and low pressure hydrogen cylinder mouth sealing valve core 2 is in close contact with the valve body 1, and the medium and low pressure hydrogen cylinder mouth sealing valve is closed.

[0024] The pressure-applying component 3 is a spring. When the valve stem 4 is not pressed down, the spring pushes the sealing valve core 2 of the medium-low pressure hydrogen cylinder port upward, and the sealing surface of the sealing valve core 2 of the medium-low pressure hydrogen cylinder port is in close contact with the valve body, thus closing the sealing valve of the medium-low pressure hydrogen cylinder port.

[0025] When valve stem 4 is pressed down, the sealing surface of the sealing valve core 2 of the medium and low pressure hydrogen cylinder mouth is separated from the valve body, and the sealing valve of the medium and low pressure hydrogen cylinder mouth is opened. When valve stem 4 rises and retracts, the spring returns to its natural state, pushing the sealing valve core 2 of the medium-low pressure hydrogen cylinder opening upwards again. The sealing surface of the sealing valve core 2 of the medium-low pressure hydrogen cylinder opening is tightly attached to the valve body, and the sealing valve of the medium-low pressure hydrogen cylinder opening is closed.

[0026] In one feasible implementation, an electromagnetic coil is provided on the valve stem 4, which is used to drive the valve stem 4 to rise or fall.

[0027] During operation, the valve core is equipped with a pressure-applying component 3 on the connecting surface 212 of the valve core body 21. Under normal conditions, the pressure-applying component 3 makes the force on the valve core sealing surface 211 less than the force on the connecting surface 212. The sealing surface 211 of the valve core body 21 is in close contact with the sealing surface 11 of the valve body 1, and the valve is in a closed state, so the gas will not overflow.

[0028] When the sealing valve needs to be opened, the valve stem 4 is pressed down. The force on the sealing surface 211 is greater than the force on the connecting surface 212. The sealing surface 211 separates from the sealing surface 11 of the valve body 1, and the valve opens.

[0029] Specifically, a spring is installed at the bottom of the stainless steel part. In its natural state, the spring applies pressure to the stainless steel part, pushing it upward. The stainless steel part, which is fitted with vulcanized rubber 22, is tightly attached to the valve body, sealing the valve body and keeping it closed, preventing gas from overflowing.

[0030] When it needs to be opened, the upper valve stem 4 is driven down by the external electromagnetic coil. The force applied to the stainless steel part presses down the valve core 2 as a whole, causing the stainless steel part with vulcanized rubber 22 to separate from the valve body 1. Gas can then pass through the gap between the valve body 1 and the stainless steel part, thereby opening the valve.

[0031] The rubber is vulcanized as a whole in the groove 22 of the valve core body 21, which increases the contact area between the vulcanized rubber 23 and the sealing surface of the valve body 1, thereby improving the sealing performance.

[0032] On the other hand, there is no gap between the vulcanized rubber 23 and the groove 22, preventing gas from entering between the vulcanized rubber 23 and the groove 22. This avoids the problem of the vulcanized rubber 23 rising and causing the valve to fail to open when the valve core sealing surface 211 separates from the valve body 1 sealing surface. By brushing adhesive into the groove 22 of the valve core, the rubber is vulcanized in the groove 22 under high temperature and pressure, avoiding the problem of valve opening failure caused by the vulcanized rubber 23 separating from the valve core body 21 when gas passes through.

[0033] The rubber venting and overflow hole 24 solves the problem of rubber delamination caused by air trapped at the bottom during production. Specifically, since the valve core is vulcanized integrally with the rubber, the rubber can easily clog the top as it flows into the groove 22 during vulcanization, resulting in poor gas venting at the bottom of the groove 22. This prevents the vulcanized rubber 23 from contacting the bottom of the groove 22, causing delamination. This can lead to gas entry and product failure during use. By providing the rubber venting and overflow hole 24, even if the top is clogged, the gas at the bottom of the groove 22 can still be expelled through the groove 22, removing gas and excess rubber, thus avoiding the aforementioned problems.

[0034] Four rubber venting and overflow holes 24 are opened around the groove 22. When the rubber flows into the rubber venting and overflow holes 24, it not only removes the gas at the bottom of the groove 22, but also applies a certain force to the vulcanized rubber 23, firmly holding the vulcanized rubber 23 and preventing the vulcanized rubber 23 from detaching upwards, thereby solving the valve core failure problem.

[0035] 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.

[0036] 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 sealing valve core for a medium-low pressure hydrogen cylinder, 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), and a vulcanized rubber (23) is provided in the groove (22), and the vulcanized rubber (23) fills the groove (22). The valve core body (21) is provided with a rubber vent overflow hole (24), one end of which is connected to the bottom of the groove (22), and the other end is connected to the outside.

2. The sealing valve core for medium and low pressure hydrogen cylinders according to claim 1, characterized in that, Four rubber venting overflow holes (24) are provided on the valve core body (21) around the groove (22).

3. The sealing valve core for medium and low pressure hydrogen cylinders according to claim 1, characterized in that, An adhesive is provided between the groove (22) and the vulcanized rubber (23).

4. The sealing valve core for medium and low pressure hydrogen cylinders according to claim 1, characterized in that, The valve core body (21) is made of stainless steel.

5. A sealing valve for the mouth of a medium- or low-pressure hydrogen cylinder, characterized in that, The medium-low 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 low-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 sealing valve core (2) of the medium and low pressure hydrogen cylinder mouth 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 medium and low pressure hydrogen bottle mouth sealing valve core (2) separates from the valve body sealing surface (11) of the valve body (1), and the medium and low pressure hydrogen bottle mouth sealing valve opens. When the valve stem (4) is not pressed down, the sealing surface (211) of the medium and low 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 medium and low pressure hydrogen bottle mouth sealing valve is closed.

6. The sealing valve for the mouth of a medium- and low-pressure hydrogen cylinder according to claim 5, characterized in that, The pressure-applying component (3) is a spring.

7. The sealing valve for the mouth of a medium- and low-pressure hydrogen cylinder 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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