Sealing structure for high-pressure hydrogen valve

Abstract

The invention relates to the technical field of sealing structures, and discloses a sealing structure for a high-pressure hydrogen valve, which comprises a middle valve body and side valve bodies respectively arranged at two ends of the middle valve body, a sealing structure is arranged at one end, close to the middle valve body, in each side valve body, and a ball sealing piece is arranged between the two sealing structures. A valve rod is installed on the top of the ball sealing piece. According to the invention, through the arrangement of the two spherical sealing elements, during use, the valve rod can be controlled to move upwards firstly through the first rotary driving device and the second rotary driving device, and the valve rod drives the spherical sealing elements to move inwards under the action of the connecting rod, so that the spherical sealing elements can be temporarily separated from the sealing structure; compared with the prior art, the device has the advantages that the friction process between the ball sealing element and the sealing structure in the movement process is effectively reduced, and the service life is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing structure, and in particular to a sealing structure for a high-pressure hydrogen valve. BACKGROUND

[0002] As a clean energy, hydrogen energy has the characteristics of high compression ratio, large-scale storage, and non-decay of energy. It has a wide range of sources and applications, and can effectively reduce the proportion of fossil energy and improve clean development. At present, the core components such as electric pile, membrane electrode and bipolar plate in the hydrogen energy industry chain have basically completed localization, but hydrogen valves have high safety requirements and great technical difficulty. The main problem of the hydrogen valve in the prior art is that its sealing performance is poor under high pressure working conditions, and hydrogen gas is easily leaked from the valve core through the valve stem.

[0003] In the Chinese patent with publication number CN 115325201 A, an intelligent high-pressure hydrogen valve is disclosed, which includes a valve body, a center cavity is formed in the valve body, a valve core is rotatably arranged in the center cavity, a valve stem is fixedly installed on the valve core, the end of the valve stem extends to the outside of the valve body through a valve sleeve on the valve body, a boss is formed on the inner wall of the valve sleeve, a packing is arranged on the boss, the packing is pressed on the boss by a pressing seat, and the pressing seat is detachably connected to the valve sleeve by a connecting bolt; the threaded sleeve is screwed on, the absorbing ring can be compressed and absorbed by the compression ring, so that the position of the absorbing ring is stably fixed, the hydrogen gas leaked between the pressing seat and the valve stem can be effectively absorbed by the side groove on the inner circumferential wall of the annular groove, and the hydrogen gas leaked between the valve sleeve and the pressing seat can be effectively absorbed by the side groove on the outer circumferential wall of the annular groove, so as to achieve the effect of effectively removing the leaked hydrogen gas and ensure the normal use of the valve under high-pressure hydrogen medium.

[0004] In the prior art, solid particles such as iron filings, welding slag and sand particles inevitably exist in the pipeline. When the solid particles adhere to the sealing element during the opening and closing process of the rotating ball core, the friction between the spherical sealing surface of the ball core and the sealing ring is large, which is inconvenient to rotate on one hand, and on the other hand, the spherical sealing surface and the sealing ring are worn, resulting in valve leakage and short service life. SUMMARY

[0005] The purpose of the present application is to solve the problems existing in the prior art, and a sealing structure for a high-pressure hydrogen valve is provided.

[0006] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0007] The utility model provides a sealing structure for high pressure hydrogen valve, including intermediate valve body and the side valve body who sets up respectively in the both ends of intermediate valve body, the side valve body is provided with sealing structure in one end near intermediate valve body in, the ball seal is arranged between two sealing structures, the top of ball seal is equipped with valve rod, and the other end of valve rod is vertically active and passes through the top of intermediate valve body to the outside of intermediate valve body, ball seal includes two spherical seals, the inner wall lower end of intermediate valve body is provided with lower support, the bottom of two spherical seals is rotated and is connected with the both sides of lower support respectively through the pivot, the both sides of valve rod bottom are rotatably installed with connecting rod through the pivot, the other end of two connecting rods is rotatably connected with the upper end of two spherical seals, one side of valve rod top is installed with rack, rack is engaged with gear, the top of valve rod is provided with first rotary drive device, the drive end of first rotary drive device is installed with second rotary drive device through connecting frame, the drive end of second rotary drive device is connected with gear, the front and back of rack are installed with limit stop plate, and the interval of the tooth block of gear and the interval of two limit stop plates are adapted.

[0008] Preferably, the bottom end of the valve rod and the top end of the lower support are provided with a jet head, and the output end of the jet head is provided with a one-way valve, the input end of the jet head is connected with a pipeline, and the two pipelines are respectively connected to the top of the valve rod and the bottom of the lower support through the inner cavity of the valve rod and the inner cavity of the lower support.

[0009] Preferably, the sealing structure comprises a cylindrical female floating valve seat, a thrust spring, a first sealing ring and a second sealing ring, and a cylindrical male floating valve seat inside the female floating valve seat; the thrust spring of the female floating valve seat is located in a groove inside the side valve body, one end of which abuts against the side valve body and the other end of which abuts against the female floating valve seat, for abutting the female floating valve seat against the ball seal; the first sealing ring is located inside the female floating valve seat and at a position in contact with the ball seal; the second sealing ring is located between the side valve body and the female floating valve seat; the male floating valve seat is located inside the female floating valve seat and at a position in contact with the ball seal.

[0010] Preferably, the connecting frame is in inverted L shape, and the drive end of the first rotary drive device is concentric with the valve rod.

[0011] Preferably, the valve rod and the lower support are connected with the intermediate valve body through a third sealing ring.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] This invention, through the use of two spherical seals, allows the valve stem to be moved upwards first via a first rotary drive device and a second rotary drive device. Under the action of the connecting rod, the valve stem drives the spherical seals to move inwards, temporarily separating them from the sealing structure. Then, the first rotary drive device rotates the spherical seals to allow hydrogen to pass through. Compared with existing technologies, this device effectively reduces the friction between the spherical seals and the sealing structure during movement, thus extending their service life. Attached Figure Description

[0014] Figure 1 This is a front sectional view of a sealing structure for a high-pressure hydrogen valve proposed in this invention.

[0015] Figure 2 This is a schematic diagram of a limiting plate for a sealing structure of a high-pressure hydrogen valve proposed in this invention.

[0016] Figure 3 This invention proposes a sealing structure for a high-pressure hydrogen valve. Figure 1 Enlarged diagram of point A in the middle.

[0017] In the diagram: 1. Intermediate valve body; 2. Side valve body; 3. Valve stem; 4. Spherical seal; 5. Lower support; 6. Connecting rod; 7. Rack; 8. Gear; 9. First rotary drive device; 10. Second rotary drive device; 11. Limiting plate; 12. Jet nozzle; 13. Pipeline; 14. Check valve; 15. Female floating valve seat; 16. Thrust spring; 17. First sealing ring; 18. Second sealing ring; 19. Sub-floating valve seat; 20. Third sealing ring; 21. Bracket. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Reference Figures 1-3A sealing structure for a high-pressure hydrogen valve includes an intermediate valve body 1 and side valve bodies 2 respectively disposed at both ends of the intermediate valve body 1. A sealing structure is provided at one end of each side valve body 2 near the intermediate valve body 1. A spherical seal is disposed between the two sealing structures. A valve stem 3 is mounted on the top of the spherical seal, and the other end of the valve stem 3 vertically and movably penetrates the top of the intermediate valve body 1 to the outside of the intermediate valve body 1. The spherical seal includes two spherical seals 4. A lower support 5 is provided at the lower end of the inner wall of the intermediate valve body 1. The bottom ends of the two spherical seals 4 are rotatably connected to both sides of the lower support 5 via rotating shafts. Connecting rods 6 are rotatably mounted on both sides of the bottom of the valve stem 3 via rotating shafts. The other ends of the two connecting rods 6 are rotatably connected to the upper ends of the two spherical seals 4, respectively. A rack 7 is mounted on one side of the top of the valve stem 3, and the rack 7 meshes with a gear 8. A first rotary drive device 9 is provided above the valve stem 3. A second rotary drive device 10 is mounted on the drive end of the first rotary drive device 9 via a connecting frame. The drive end of the second rotary drive device 10 is connected to the gear 8. Limiting plates 11 are installed on both the front and rear sides of the rack 7. The front-to-back spacing of the teeth of the gear 8 is adapted to the spacing of the two limiting plates 11.

[0020] In use, this device, via the first rotary drive device 9 and the second rotary drive device 10, can first control the valve stem 3 to move upward (the second rotary drive device 10 is activated, rotating the gear 8, which drives the rack 7 and the valve stem 3 to move upward). Under the action of the connecting rod 6, the valve stem 3 drives the spherical seal 4 to move inward, thus temporarily separating the spherical seal 4 from the sealing structure. Then, it is driven by the first rotary drive device 9 to rotate (the first rotary drive device 9 rotates the second rotary drive device 10; due to the limit plates 11 on both sides of the rack 7, when the gear 8 is driven to rotate by the first rotary drive device 9, it drives the rack 7 and the valve stem 3 to rotate together), allowing hydrogen to pass through. Compared with the prior art, this device effectively reduces the friction process between the spherical seal and the sealing structure during movement, thus extending its service life.

[0021] In this embodiment, a jet nozzle 12 is provided at the bottom end of the valve stem 3 and the top end of the lower support 5, and a one-way valve 14 is provided at the output end of the jet nozzle 12. The input end of the jet nozzle 12 is connected to a pipe 13, and the two pipes 13 pass through the inner cavity of the valve stem 3 and the inner cavity of the lower support 5 respectively to the top of the valve stem 3 and the bottom of the lower support 5. This device can periodically inject gas into the jet nozzle 12 through the pipe 13. The gas can be used to blow the sealing structure, thereby removing solid particles that adhere to the sealing structure during the use of this device and improving the service life of this device (this cleaning process can be performed periodically).

[0022] In this embodiment, the sealing structure includes a cylindrical female floating valve seat 15, a thrust spring 16, a first sealing ring 17 and a second sealing ring 18, and a cylindrical female floating valve seat 19 located inside the female floating valve seat. The thrust spring 16 of the female floating valve seat is located in a groove inside the side valve body 2, with one end abutting against the side valve body 2 and the other end abutting against the female floating valve seat, for pressing the female floating valve seat against the spherical seal. The first sealing ring 17 is located inside the female floating valve seat and is in contact with the spherical seal. The second sealing ring 18 is located between the side valve body 2 and the female floating valve seat. The female floating valve seat 19 is located inside the female floating valve seat and is in contact with the spherical seal. It adopts two independent cylindrical floating soft sealing valve seats, with the cylindrical female floating sealing valve seat housed in the cylindrical female floating sealing valve seat. It is a mother-daughter combination soft sealing structure, each independently performing a double sealing function, making the sealing more reliable.

[0023] In this embodiment, the connecting frame is inverted L-shaped, and the driving end of the first rotary drive device 9 is concentric with the valve stem 3.

[0024] In this embodiment, the valve stem 3 and the lower support 5 are both connected to the intermediate valve body 1 through the third sealing ring 20, which facilitates the sealing of the valve stem 3 and the lower support 5 with the intermediate valve body 1.

[0025] In this embodiment, the top of the intermediate valve body 1 is connected to the top of the first rotary drive device 9 via a bracket 21 for mounting the first rotary drive device 9.

[0026] In this embodiment, the sealing ring can be made of rubber, and the first rotary drive device 9 and the second rotary drive device 10 can be rotary motors.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A sealing structure for a high-pressure hydrogen valve, comprising an intermediate valve body and side valve bodies respectively disposed at both ends of the intermediate valve body, wherein a sealing structure is disposed at one end of the side valve body near the intermediate valve body, a spherical seal is disposed between the two sealing structures, a valve stem is mounted on the top of the spherical seal, and the other end of the valve stem vertically and movably penetrates the top of the intermediate valve body to the outside of the intermediate valve body, characterized in that: The spherical seal includes two spherical seals. A lower support is provided at the lower end of the inner wall of the intermediate valve body. The bottom ends of the two spherical seals are rotatably connected to the two sides of the lower support via rotating shafts. Connecting rods are rotatably installed on both sides of the bottom of the valve stem via rotating shafts. The other ends of the two connecting rods are rotatably connected to the upper ends of the two spherical seals. A rack is installed on one side of the top of the valve stem. The rack meshes with a gear. A first rotary drive device is provided above the valve stem. A second rotary drive device is installed at the drive end of the first rotary drive device via a connecting frame. The drive end of the second rotary drive device is connected to the gear. Limiting plates are installed on both the front and rear sides of the rack. The front-to-back spacing of the gear teeth is adapted to the spacing of the two limiting plates.

2. The sealing structure for a high-pressure hydrogen valve according to claim 1, characterized in that: Both the bottom end of the valve stem and the top end of the lower support are equipped with jet nozzles, and the output end of the jet nozzles is equipped with a one-way valve. The input end of the jet nozzles is connected to a pipe, and the two pipes pass through the inner cavity of the valve stem and the inner cavity of the lower support to the top of the valve stem and the bottom of the lower support, respectively.

3. The sealing structure for a high-pressure hydrogen valve according to claim 1, characterized in that: The sealing structure includes a cylindrical female floating valve seat, a thrust spring, a first sealing ring, a second sealing ring, and a cylindrical female floating valve seat located inside the female floating valve seat. The thrust spring of the female floating valve seat is located in a groove inside the side valve body, with one end abutting against the side valve body and the other end abutting against the female floating valve seat, for pressing the female floating valve seat against the spherical seal. The first sealing ring is located inside the female floating valve seat and is in contact with the spherical seal. The second sealing ring is located between the side valve body and the female floating valve seat. The female floating valve seat is located inside the female floating valve seat and is in contact with the spherical seal.

4. A sealing structure for a high-pressure hydrogen valve according to claim 2, characterized in that: The connecting frame is inverted L-shaped, and the driving end of the first rotary drive device is concentric with the valve stem.

5. A sealing structure for a high-pressure hydrogen valve according to claim 1, characterized in that: Both the valve stem and the lower support are connected to the intermediate valve body via a third sealing ring.

6. A sealing structure for a high-pressure hydrogen valve according to claim 1, characterized in that: The top of the intermediate valve body is connected to the top of the first rotary drive device via a bracket.

Images