One-way control valve for inflating gas cylinder

Abstract

The utility model discloses a one-way control valve for gas cylinder inflation, which relates to the technical field of gas cylinder inflation and comprises a pull rod hermetically connected to a gas inlet of a gas cylinder inner container, and a gas channel communicated with the gas cylinder inner container is arranged at the position of a central shaft of the pull rod. A one-way valve is arranged at the end, away from the gas cylinder inner container, of the gas channel, and the gas cylinder inner container is inflated and pressurized in the conduction direction of the one-way valve. The side wall of the pull rod is further provided with a pressure release valve used for releasing pressure, and the pressure release valve is communicated with the air channel. After the structure is adopted, the pull rod is arranged on the gas inlet of the gas cylinder liner, the one-way valve is arranged at one end of the pull rod, the one-way valve can inflate and pressurize the gas cylinder liner, air in the gas cylinder liner cannot flow out, and therefore the sealing performance of the gas cylinder liner is guaranteed; the pressure release valve is installed on the side portion of the pull rod, emergency pressure release is achieved through the pressure release valve, and production safety is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of gas cylinder filling technology, and in particular to a one-way control valve for gas cylinder filling. Background Technology

[0002] The production process of wound gas cylinders involves pressurizing the inner liner to a pre-charge pressure and sealing it to obtain a pressurized inner liner. Next, according to a predetermined layup plan, high-strength fibers are wound around the pressurized inner liner to obtain a wound inner liner. Finally, the wound inner liner is placed in a curing oven for high-temperature curing to form a composite material structure, resulting in a high-pressure hydrogen storage cylinder with a composite inner liner. During the curing process, pressure holding is required. This pressure holding not only further compresses the resin matrix in the composite material layers, making it more tightly packed between the fibers and improving the cylinder's seal, but also enhances the overall strength of the composite material layers, enabling it to withstand higher pressures without damage.

[0003] However, existing spiral wound gas cylinder liners have poor sealing performance, leading to leaks after the cylinders are filled with gas during the winding stage. This significantly reduces the hydrogen storage capacity of the cylinders, sometimes even failing to meet quality standards. Furthermore, emergency pressure relief measures are insufficient. If the internal pressure of the system abnormally increases or other safety hazards exist during the winding and curing process, traditional manufacturing systems often lack effective emergency pressure relief methods, increasing safety risks during production. Utility Model Content

[0004] The purpose of this utility model is to provide a one-way control valve for filling gas cylinders, which is installed on the air inlet of the gas cylinder liner to achieve the sealing of the gas cylinder liner and ensure its airtightness; at the same time, by setting a pressure relief valve, emergency pressure relief is achieved to ensure production safety.

[0005] To achieve the above objectives, this utility model provides a one-way control valve for filling gas cylinders, including a pull rod sealed to the air inlet of the gas cylinder liner, and an air passage communicating with the gas cylinder liner at the central axis of the pull rod; a one-way valve is provided at the end of the air passage away from the gas cylinder liner, and the one-way valve is directed to pressurize the gas cylinder liner; a pressure relief valve for depressurization is also provided on the side wall of the pull rod, and the pressure relief valve is connected to the air passage.

[0006] With the above structure, a one-way valve is installed at one end of a pull rod on the air inlet of the gas cylinder liner. The one-way valve can pressurize the gas cylinder liner by filling it with gas, while the air inside the gas cylinder liner cannot flow out, thus ensuring its sealing. A pressure relief valve is installed on the side of the pull rod, which enables emergency pressure relief and ensures production safety.

[0007] Preferably, the one-way valve includes a valve body sealed and fixed to a pull rod, with a valve cavity on the valve body communicating with an air passage; the one-way valve also includes a valve seat fixed in the valve cavity and having a valve port thereon, a piston slidably mounted in the valve cavity and in sealing contact with the valve port, and a return spring that presses the piston against the valve port; when the piston presses against the valve port, the air passage is closed; a push rod is fixed to one side of the piston located on the valve seat, and the push rod extends out of the valve port. With this structure, the air passage is opened by the push rod being pressed by the push pin, allowing for pressurization. This structure ensures that when the push rod is not pressed, the spring force of the return spring is sufficient to close the air passage, thus guaranteeing the one-way sealing effect of the one-way valve.

[0008] Preferably, a guide rod is fixed to the side of the piston away from the valve seat, and a fixed support is provided on the inner wall of the valve cavity, with an airflow channel provided on the fixed support; the guide rod is slidably mounted on the fixed support, and a return spring is sleeved on the guide rod and clamped between the fixed support and the piston. The fixed support and guide rod provide guidance for the piston's movement, ensuring the sealing effect of the one-way valve.

[0009] Preferably, the surface where the piston contacts the valve port is a conical surface, and a rubber layer is provided on the conical surface. The conical surface and the rubber layer ensure a tight fit between the valve port and the piston, guaranteeing a sealing effect.

[0010] Preferably, the return spring is a conical spring, with its smallest diameter resting against the fixed support and its largest diameter resting against the piston. The conical spring design ensures the stability of the spring and the return effect.

[0011] Preferably, a secondary sealing device is also provided within the valve cavity. This secondary sealing device includes a valve ball fixed to the end of the guide rod away from the piston, a ball seat disposed within the valve cavity between the valve ball and a fixed support, and a compression spring that presses the valve ball against the ball seat, ensuring a sealing contact between the valve ball and the ball seat. This structure enhances the secondary sealing effect. Furthermore, connecting the valve ball to the guide rod allows for guidance of the valve ball, enabling simultaneous opening and closing of both the piston and the valve ball.

[0012] Preferably, a guide cover is also provided between the compression spring and the valve ball. The guide cover is fastened to the valve ball and moves together with the valve ball. The outer edge of the guide cover slides axially with the inner wall of the valve cavity. This structure ensures the contact area between the compression spring and the valve ball, preventing uneven force on the valve ball.

[0013] Preferably, the guide cover includes three claws, each of which has an arc-shaped surface adapted to the valve ball. This structural design ensures that the guide cover has sufficient support area.

[0014] Preferably, the guide cover has a stepped surface on the side of the compression spring, and the compression spring is secured to the stepped surface. This structure ensures the installation stability of the compression spring.

[0015] Preferably, a mounting nut is screwed onto the end of the valve cavity away from the valve seat, and a through hole is provided at the center of the mounting nut, which connects the air passage and the valve cavity. This design facilitates installation.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are:

[0017] This utility model provides a one-way control valve for filling gas cylinders, which solves the technical problems of poor sealing after filling gas cylinders and the lack of a pressure relief device, which can easily lead to safety accidents. This utility model is installed on the air inlet of the gas cylinder liner, which realizes the sealing of the gas cylinder liner and ensures its sealing performance; at the same time, by setting a pressure relief valve, emergency pressure relief is realized, ensuring production safety. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a one-way control valve for filling gas cylinders according to this utility model;

[0019] Figure 2 This is a schematic diagram of the internal structure of the tie rod;

[0020] Figure 3 This is a schematic diagram of the one-way valve in Embodiment 4;

[0021] Figure 4 yes Figure 3 A schematic diagram of the structure of the guide shield.

[0022] In the diagram, 1 is the gas cylinder, 2 is the pull rod, 21 is the gas passage, 22 is the one-way valve, 221 is the valve body, 222 is the valve seat, 223 is the piston, 224 is the return spring, 225 is the push rod, 226 is the mounting nut, 227 is the guide rod, 228 is the fixed support, 23 is the pressure relief valve, 24 is the positioning screw, 25 is the secondary sealing device, 251 is the valve ball, 252 is the ball seat, 253 is the compression spring, 254 is the guide cover, 2541 is the arc surface, and 2542 is the stepped surface. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] The orientations mentioned in this specification are based on the orientation of the one-way control valve for filling gas cylinders of this utility model when it is working normally. They do not limit the orientation during storage and transportation, and only represent relative positional relationships, not absolute positional relationships.

[0025] Example 1:

[0026] like Figure 1 and Figure 2 As shown, a one-way control valve for filling a gas cylinder includes a pull rod 2 sealed to the air inlet of the inner liner of the gas cylinder 1. An air passage 21 communicating with the inner liner of the gas cylinder 1 is opened at the central axis of the pull rod 2. A one-way valve 22 is provided at the end of the air passage 21 away from the inner liner of the gas cylinder 1. The conduction direction of the one-way valve 22 is to pressurize the inner liner of the gas cylinder 1. A pressure relief valve 23 for depressurization is also provided on the side wall of the pull rod 2. The pressure relief valve 23 is connected to the air passage 21.

[0027] In this embodiment, the pull rod 2 is fixed to the air inlet of the inner liner of the gas cylinder 1 by screwing. Specifically, the air inlet of the inner liner of the gas cylinder 1 is provided with an internal thread, the pull rod 2 is inserted into the air inlet of the inner liner of the gas cylinder 1, and its outer side wall is provided with an external thread that mates with the internal thread. By screwing the pull rod 2, it is fixed to the air inlet of the inner liner of the gas cylinder 1. To ensure a seal, a sealing ring is sandwiched between the pull rod 2 and the air inlet of the inner liner of the gas cylinder 1.

[0028] In this embodiment, the pressure relief valve 23 is a manual pressure relief valve. Specifically, a pressure relief hole is provided on the outer circumference of the pull rod 2, and the pressure relief hole is connected to the air passage 21. A thread is provided inside the pressure relief hole, and a pressure relief screw is installed through the thread. A sealing ring is clamped between the bottom of the pressure relief screw and the pressure relief hole, thus sealing the pressure relief hole. When pressure relief is needed, the pressure relief screw is manually loosened to release the seal and allow gas to escape from the pressure relief hole. Of course, in practical applications, an electromagnetic pressure relief valve or other automatic pressure relief valve can also be used.

[0029] For ease of installation, a positioning screw 24 is fixed on the pull rod 2. The positioning screw 24 is used to position and connect the pull rod 2 to the rotating mechanism and the inflation mechanism. In this embodiment, the positioning screw 24 is a hexagonal screw screwed onto the outer wall of the pull rod 2. The depth of the threaded hole of the positioning screw 24 can be reasonably set according to the wall thickness of the pull rod 2. In this embodiment, in order to ensure the stability of the installation and ensure sufficient connection strength, the threaded hole of the positioning screw 24 passes downward through the air passage 21, but does not close the air passage. In practical applications, it is not necessary to penetrate the air passage 21. A sealing ring is clamped between the positioning screw 24 and the threaded hole to ensure its sealing performance. Of course, other connection methods can also be used in practical applications, such as milling flattening the pull rod 2 for positioning and installation. Since the installation method of the pull rod 2 is not directly related to the solution of this application, this embodiment will not describe or limit this installation method in detail.

[0030] Example 2:

[0031] This embodiment provides a preferred solution for a one-way valve 22 based on Embodiment 1.

[0032] like Figure 2As shown, the one-way valve 22 includes a valve body 221 sealed and fixed on the pull rod 2, and a valve cavity is provided on the valve body 221, which communicates with the air passage 21. The one-way valve 22 also includes a valve seat 222 fixed in the valve cavity and having a valve port thereon, a piston 223 slidably installed in the valve cavity and in sealing contact with the valve port, and a return spring 224 pressing the piston 223 against the valve port; there is an airflow passage between the piston 223 and the valve cavity, and the air passage 21 is closed when the piston 223 presses against the valve port; a push rod 225 is fixed on the piston 223 on one side of the valve seat 222, the push rod 225 extends out of the valve port, and there is an air inlet between the push rod 225 and the valve port of the valve seat 222.

[0033] When the ejector pin of the external inflation device presses against the ejector rod 225, it pushes the piston 223 away from the valve port, the air passage 21 opens, and high-pressure air enters the inner liner of the gas cylinder through the air passage 21 via the valve port, thus achieving inflation.

[0034] To facilitate installation and connection, a mounting nut 226 is screwed onto the end of the valve cavity away from the valve seat 222. A through hole is provided at the center of the mounting nut 226, which connects the air passage 21 and the valve cavity.

[0035] Example 3:

[0036] In order to increase the guiding performance of the piston 223 and avoid poor sealing between it and the valve seat 222, this embodiment adds a guide rod 227 based on embodiment two. The specific installation method is as follows: a guide rod 227 is fixed to the side of the piston 223 away from the valve seat 222; a fixed support 228 is provided on the inner wall of the valve cavity, and an airflow channel is provided on the fixed support 228; the guide rod 227 is slidably mounted on the fixed support 228; and a return spring 224 is sleeved on the guide rod 227 and clamped between the fixed support 228 and the piston 223.

[0037] The surface of piston 223 that contacts the valve port is a conical surface, and the conical contact surface of piston 223 is provided with a rubber layer to enhance the sealing effect.

[0038] To enhance the airflow effect, the airflow channel is enlarged as much as possible. Therefore, to ensure the stability of the piston 223, the return spring 224 in this embodiment is a conical spring, with its smallest diameter resting against the fixed support 228 and its largest diameter resting against the piston 223, ensuring spring stability and return effect. In practical applications, a regular spring can also be used.

[0039] Example 4:

[0040] like Figure 3 and Figure 4 As shown in the figure, this embodiment is a further improvement on embodiment three.

[0041] To increase the reliability of the seal, a secondary sealing device 25 is also provided in the valve cavity. The secondary sealing device 25 includes a valve ball 251 fixed to the end of the guide rod 227 away from the piston 223, a ball seat 252 located in the valve cavity between the valve ball 251 and the fixed support 228, and a pressure spring 253 that presses the valve ball 251 against the ball seat 252, with the valve ball 251 and ball seat 252 in sealing contact. The secondary sealing device 25 improves the sealing effect of the one-way valve 22 and reduces the sealing pressure of the piston 223. Of course, the secondary sealing device 25 can be set independently, that is, the valve ball 251 is not fixed to the guide rod 227. The advantage of the two being linked is that it ensures their synchronization; when one becomes stuck, the spring of the other can also play a reset role.

[0042] To ensure the stable movement of the valve ball 251, a guide cover 254 is added between the compression spring 253 and the valve ball 251. The guide cover 254 is fastened to the valve ball 251 and moves together with the valve ball 251. The outer edge of the guide cover 254 slides axially with the inner wall of the valve body 221.

[0043] Preferably, the guide cover 254 includes three claws connected in a Y-shape, and each of the three claws is provided with an arc-shaped surface 2541 adapted to the valve ball 251, so as to better adapt to the shape of the valve ball 251 and ensure its stable movement.

[0044] Furthermore, the guide cover 254 is provided with a stepped surface 2542 on one side of the compression spring 253, and the compression spring 253 is locked on the stepped surface 2542 to ensure the stable installation of the compression spring 253.

[0045] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A one-way control valve for filling gas cylinders, characterized in that: It includes a pull rod that is sealed and connected to the air inlet of the gas cylinder liner, and an air passage communicating with the gas cylinder liner is opened at the central axis position of the pull rod; A one-way valve is provided at the end of the air passage away from the inner liner of the gas cylinder. The one-way valve is open in the direction of pressurizing the inner liner of the gas cylinder. A pressure relief valve is also provided on the side wall of the pull rod for depressurization. The pressure relief valve is connected to the air passage.

2. The one-way control valve for filling gas cylinders according to claim 1, characterized in that: The one-way valve includes a valve body that is sealed and fixed on the pull rod, and a valve cavity is provided on the valve body, which is in communication with the air passage; the one-way valve also includes a valve seat that is fixed in the valve cavity and has a valve port thereon, a piston that is slidably installed in the valve cavity and in sealing contact with the valve port, and a return spring that presses the piston against the valve port. When the piston presses against the valve port, the air passage is closed; a push rod is fixed on one side of the piston located on the valve seat, and the push rod extends out of the valve port.

3. The one-way control valve for filling gas cylinders according to claim 2, characterized in that: A guide rod is fixed on the side of the piston away from the valve seat. A fixed support is provided on the inner wall of the valve cavity, and an airflow channel is provided on the fixed support. The guide rod is slidably mounted on the fixed support, and the return spring is sleeved on the guide rod and clamped between the fixed support and the piston.

4. A one-way control valve for filling gas cylinders according to claim 3, characterized in that: The surface of the piston that contacts the valve port is a conical surface, and a rubber layer is provided on the conical surface.

5. A one-way control valve for filling gas cylinders according to claim 3, characterized in that: The return spring is a conical spring, with its smallest diameter abutting against the fixed support and its largest diameter abutting against the piston.

6. A one-way control valve for filling gas cylinders according to claim 3, characterized in that: The valve cavity is also provided with a secondary sealing device, which includes a valve ball fixed to the end of the guide rod away from the piston, a ball seat disposed in the valve cavity between the valve ball and the fixed support, and a pressure spring that presses the valve ball against the ball seat, wherein the valve ball and the ball seat are in sealing contact.

7. A one-way control valve for filling gas cylinders according to claim 6, characterized in that: A guide cover is also provided between the compression spring and the valve ball. The guide cover is fastened to the valve ball and moves together with the valve ball. The outer edge of the guide cover slides axially with the inner wall of the valve cavity.

8. A one-way control valve for filling gas cylinders according to claim 7, characterized in that: The guide cover includes three claws, each of which has an arc-shaped surface adapted to the valve ball.

9. A one-way control valve for filling gas cylinders according to claim 7, characterized in that: The guide cover has a stepped surface on one side of the compression spring, and the compression spring is engaged on the stepped surface.

10. A one-way control valve for filling gas cylinders according to claim 6, characterized in that: The valve cavity is sealed with a mounting nut at one end away from the valve seat. A through hole is provided at the center of the mounting nut, and the through hole connects the air passage and the valve cavity.

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