Pressure balance type manual valve device for high-pressure gas cylinder

Abstract

The utility model discloses a pressure balance type manual valve device for a high-pressure gas cylinder. The pressure balance type manual valve device comprises a valve body and a valve cover which are fixed in a sealed mode. The valve body is provided with an inlet end and an outlet end; a valve element is arranged on the side, close to the inlet end, of the valve deck, and a valve rod is arranged on the side, away from the inlet end, of the valve deck. A transmission hexagon is arranged at the position, close to the front end, of the valve rod. A transmission thread is arranged on the outer wall of the valve core and is in threaded fit with the inner wall of the valve cover; a hexagonal structure matched with the transmission hexagon is arranged in an inner cavity of the valve element. And the valve core is provided with a pressure balance channel which is communicated with the inner cavity of the valve core and the inlet end of the valve body. The manual valve operating device effectively solves the problems that the manual valve operating device under the working conditions of high pressure and large caliber is large in operating torque, easy to block and the like in principle.

Description

Technical Field

[0001] The utility model relates to the technical field of high-pressure hydrogen storage cylinder accessories, in particular to a pressure-balanced manual valve device for a high-pressure cylinder. Background Art

[0002] In the field of high-pressure hydrogen storage cylinder accessories, a manual valve operating device is a very common structure. For example, Chinese patent document No. CN110345257A discloses a built-in cylinder valve and a cylinder equipped with the valve.

[0003] However, manual valve operating mechanisms often suffer from high operating torque and transmission mechanism jamming, especially in large-diameter, high-pressure devices. In conventional manual valve operating mechanisms, the transmission thread directly bears the inlet pressure. Larger diameters and higher pressures result in greater axial forces, making operation difficult.

[0004] In a conventional manual valve operating device, the valve core and valve stem are integrated. The shaking caused by the operation directly affects the positioning accuracy of the valve core and valve body sealing surface, thereby affecting the sealing effect. Utility Model Content

[0005] The utility model provides a pressure-balanced manual valve device for high-pressure gas cylinders, which effectively solves the problems of large operating torque and easy jamming of the manual valve operating device under high-pressure and large-caliber working conditions.

[0006] A pressure-balanced manual valve device for a high-pressure gas cylinder comprises a sealed and fixed valve body and a valve cover; the valve body is provided with an inlet end and an outlet end;

[0007] The valve cover is provided with a valve core on the side close to the inlet end and a valve stem on the side away from the inlet end; the valve stem is provided with a transmission hexagon near the front end; the outer wall of the valve core is provided with a transmission thread, which is threadedly matched with the inner wall of the valve cover; the inner cavity of the valve core is provided with a hexagonal structure that matches the transmission hexagon; the valve core is provided with a pressure balancing channel connecting the inner cavity of the valve core and the inlet end of the valve body.

[0008] The main implementation principle of the utility model is to balance the pressure difference between the inside and outside of the valve core so that it is not subjected to the pressure difference force of the medium; the operating torque is transmitted between the valve stem and the valve core through the transmission hexagonal structure, and the pressure difference force of the medium is transferred to the valve stem, thereby reducing the operating torque.

[0009] Furthermore, the valve stem and the valve cover are sealed by a first valve stem sealing assembly, and a double sealing ring structure is provided, wherein the inner sealing ring is provided with a sealing retainer ring. The double sealing ring structure can improve the position accuracy of the valve stem and the sealing state of the sealing ring.

[0010] Furthermore, the valve cover and the valve body are sealed by a valve cover sealing assembly.

[0011] Furthermore, the valve core and the inlet end of the valve body are sealed via a valve core sealing surface.

[0012] Furthermore, the valve stem is provided with a second valve stem sealing assembly in front of the transmission hexagonal portion, for maintaining a seal between the valve stem and the inner cavity of the valve core. By providing the sealing assembly between the valve stem and the valve core, leakage of the inlet medium to the outlet end is prevented when the valve core sealing surface is closed.

[0013] Furthermore, the valve stem is provided with a gasket bearing between the rear end of the transmission hexagon and the inner wall of the valve cover. The pressure of the medium entering the valve core cavity is transmitted to the valve stem, which receives the axial force of the medium and transmits it to the gasket bearing, thereby reducing the operating torque.

[0014] Furthermore, the pressure-bearing areas of the valve core on both sides of the pressure-balancing channel are equal. This equal pressure-bearing area on both sides of the valve core achieves pressure balance. Regardless of whether the sealing surface is open or closed, the valve core remains in a pressure-balanced state. The drive threads on the outer wall of the valve core are not subjected to the force generated by the inlet and outlet pressure differential, thereby reducing operating torque and preventing thread jamming.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In the present invention, the operating torque is transmitted between the valve stem and the valve core through the transmission hexagonal structure, and the pressure difference force of the medium is transferred to the valve stem. The gasket bearing provides support for the valve stem, thereby reducing the operating torque.

[0017] 2. The utility model provides a pressure balance channel connecting the inner cavity of the valve core and the inlet end of the valve body. Regardless of whether the sealing surface is open or closed, the valve core is in a pressure balance state, and the transmission thread is not subjected to the force generated by the inlet and outlet pressure difference, thereby reducing the operating torque and avoiding thread jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural schematic diagram of a pressure-balanced manual valve device for a high-pressure gas cylinder according to the present invention;

[0019] Figure 2 It is a structural diagram of the valve core in this utility model.

[0020] In the figure: 1. Valve body; 11. Pressure-bearing area; 12. Inlet end; 13. Outlet end; 2. Valve core; 21. Pressure balance channel; 22. Transmission hexagon; 23. Pressure-bearing area; 24. Transmission thread; 25. Valve core sealing surface; 3. Second valve stem sealing assembly; 4. Valve cover sealing assembly; 5. Gasket bearing; 6. First valve stem sealing assembly; 61. Sealing ring; 7. Valve stem; 8. Valve cover. DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be noted that the embodiments described below are intended to facilitate understanding of the present invention and do not have any limiting effect on the present invention.

[0022] With the increase in storage capacity in the field of high-pressure hydrogen storage cylinders, the volume of cylinders is getting larger and larger, and the pressure is getting higher and higher. The flow capacity requirements for cylinder accessories are getting higher and higher. However, the basic performance of raw materials is difficult to develop synchronously. It is necessary to change the force relationship of each component in principle to improve the operability of the device.

[0023] like Figure 1 and Figure 2 As shown, a pressure-balanced manual valve device for a high-pressure gas cylinder includes a sealed and fixed valve body 1 and a valve cover 8; the valve body 1 is provided with an inlet end 12 and an outlet end 13.

[0024] The valve cover 8 is provided with a valve core 2 on the side close to the inlet end 12, and a valve stem 7 on the side away from the inlet end 12; the valve stem 7 is provided with a transmission hexagon 22 near the front end; the outer wall of the valve core 2 is provided with a transmission thread 24, which is threadedly matched with the inner wall of the valve cover 8; the inner cavity of the valve core 2 is provided with a hexagonal structure that matches the transmission hexagon 22; the operating torque is transmitted between the valve stem 7 and the valve core 2 through the transmission hexagonal structure.

[0025] The valve core 2 is provided with a pressure-balancing channel 21 connecting the inner cavity of the valve core 2 with the inlet end 12 of the valve body 1. The corresponding pressure-bearing areas of the valve core 2 on both sides of the pressure-balancing channel 21 are equal. The pressure-bearing area 11 on the outside of the valve core 2 is equal to the pressure-bearing area 23 on the inside.

[0026] By setting a pressure balancing channel 21 on the valve core 2 and setting the pressure-bearing areas on both sides of the valve core 2 to be equal, the pressure of the valve core is balanced. Regardless of whether the sealing surface is open or closed, the valve core 2 is in a pressure balanced state. The transmission thread on the outer wall of the valve core 2 does not bear the force generated by the inlet and outlet pressure difference, thereby reducing the operating torque and avoiding thread jamming.

[0027] A second stem seal assembly 3 is installed in front of the transmission hexagonal element 22 of the valve stem 7, ensuring a seal between the stem 7 and the inner cavity of the valve core 2. A spacer bearing 5 is installed between the rear end of the transmission hexagonal element 22 and the inner wall of the valve cover 8. The pressure of the medium entering the inner cavity of the valve core 2 is transmitted to the stem 7, which then receives the axial force of the medium and transmits it to the spacer bearing 5, thereby reducing operating torque.

[0028] The valve stem 7 and the valve cover 8 are sealed by the first valve stem sealing assembly 6, and a double sealing ring structure is provided. The inner sealing ring is provided with a sealing retainer ring 61. The double sealing ring structure can improve the position accuracy of the valve stem 7 and improve the sealing state of the sealing ring.

[0029] The valve cover 8 and the valve body 1 are sealed by the valve cover sealing assembly 4 .

[0030] The valve core 2 and the inlet end 12 of the valve body 1 are sealed via a valve core sealing surface 25 .

[0031] In this embodiment, the valve core sealing surface 25 is made of engineering plastic PEEK / POM; the valve body 1 is made of 6061-T6 aluminum alloy material; the second valve stem sealing assembly 3, the valve cover sealing assembly 4, and the first valve stem sealing assembly 6 use rubber sealing rings, such as modified hydrogenated nitrile butadiene rubber and modified fluororubber; the gasket bearing 5 is made of H62 brass; and the sealing retaining ring 61 is made of engineering plastic PEFE or PEEK.

[0032] When the valve core 2 is closed, the valve core sealing surface 25 and the second valve stem sealing assembly 3 provide sealing to separate the inlet end 12 from the outlet end 13; when the valve core 2 is opened, the inlet end 12 and the outlet end 13 are connected.

[0033] The use of the device of the utility model can greatly reduce the operating torque. The split design of the valve stem and the valve core can also improve the stress conditions of each sealing component, avoid mutual interference, and improve the sealing performance.

[0034] The embodiments described above provide a detailed description of the technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, supplements and equivalent substitutions made within the scope of the principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A pressure-balanced manual valve device for a high-pressure gas cylinder, characterized in that: It comprises a sealed and fixed valve body (1) and a valve cover (8); the valve body (1) is provided with an inlet end (12) and an outlet end (13); The valve cover (8) is provided with a valve core (2) on the side close to the inlet end (12) and a valve stem (7) on the side away from the inlet end (12); the valve stem (7) is provided with a transmission hexagon (22) near the front end; the outer wall of the valve core (2) is provided with a transmission thread (24), which is threadedly matched with the inner wall of the valve cover (8); the inner cavity of the valve core (2) is provided with a hexagonal structure that matches the transmission hexagon (22); the valve core (2) is provided with a pressure balance channel (21) that connects the inner cavity of the valve core (2) and the inlet end (12) of the valve body (1).

2. The pressure-balanced manual valve device for high-pressure gas cylinders according to claim 1, characterized in that: The valve stem (7) and the valve cover (8) are sealed via a first valve stem sealing assembly (6), and a double sealing ring structure is provided.

3. The pressure-balanced manual valve device for high-pressure gas cylinders according to claim 1, characterized in that: The valve cover (8) and the valve body (1) are sealed via a valve cover sealing assembly (4).

4. The pressure-balanced manual valve device for high-pressure gas cylinders according to claim 1, characterized in that: The valve core (2) and the inlet end (12) of the valve body (1) are sealed via a valve core sealing surface (25).

5. The pressure-balanced manual valve device for high-pressure gas cylinders according to claim 1, characterized in that: The valve stem (7) is provided with a second valve stem sealing assembly (3) in front of the transmission hexagon (22), which is used to maintain the seal between the valve stem (7) and the inner cavity of the valve core (2).

6. The pressure-balanced manual valve device for high-pressure gas cylinders according to claim 1, characterized in that: The valve stem (7) is provided with a spacer bearing (5) between the rear end of the transmission hexagon (22) and the inner wall of the valve cover (8).

7. The pressure-balanced manual valve device for a high-pressure gas cylinder according to claim 1, characterized in that: The pressure-bearing areas of the valve cores (2) corresponding to the two sides of the pressure balance channel (21) are equal.

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