Multiple seal hydrogen ball valve based on pressure self-balancing

Abstract

This invention belongs to the field of valve technology. A multi-seal hydrogen transport ball valve based on pressure self-balancing includes a valve body; a left flange head is bolted to the left end of the valve body; a right flange head is bolted to the right end of the valve body; and bottom supports are bolted to the sides of both the left and right flange heads. This invention significantly improves the overall sealing performance and service life of the ball valve. Because the structural stability of the valve ball and stem is guaranteed, on the one hand, the valve ball and the valve seats on both sides can always maintain uniform and reliable pre-tightening contact, ensuring zero leakage of the main seal; on the other hand, the stability of the valve stem also ensures its concentricity with the stuffing box, preventing premature failure of the valve stem seal due to valve stem wobbling. Therefore, the ball valve of this invention can maintain excellent sealing performance for a long time, greatly improving the operational safety and reliability under harsh hydrogen conditions.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, specifically a multi-seal hydrogen transport ball valve based on pressure self-balancing. Background Technology

[0002] In the hydrogen energy industry chain, the safe and efficient transportation of hydrogen is a crucial link. Ball valves, due to their compact structure, low fluid resistance, and rapid opening and closing, are widely used in hydrogen transportation pipeline systems as key components for cutting off or controlling the medium.

[0003] However, traditional hydrogen delivery ball valves inherently suffer from a force imbalance problem when closed. Specifically, when the valve is closed, one side of the ball (the inlet) is directly connected to the upstream high-pressure hydrogen pipeline, bearing the enormous thrust generated by the high-pressure hydrogen within the pipeline. Simultaneously, the other side of the ball (the outlet) is isolated from the downstream pipeline, operating at low or no pressure. This significant pressure difference results in the ball bearing a continuous unidirectional pressure load.

[0004] During long-term service, this continuous unbalanced load can adversely affect the valve body structure. First, the enormous unidirectional pressure acts on the valve ball and is transmitted to the valve stem support components through the valve stem, easily causing slight displacement or deflection of the valve ball and bending deformation of the valve stem. Second, this deformation can disrupt the precise fit between the valve ball and the valve seat, creating a potential leakage gap between them. Simultaneously, the deformation of the valve stem can also affect its concentricity with the stuffing box, leading to a decrease in the sealing performance of the valve stem seal.

[0005] In summary, traditional hydrogen delivery ball valves suffer from unbalanced forces when closed, which can easily lead to structural deformation of the valve ball and stem after long-term operation. This results in the failure of both the valve seat seal and the valve stem seal, seriously threatening the safety and reliability of the hydrogen delivery system. Therefore, a multi-seal hydrogen delivery ball valve based on pressure self-balancing is needed to solve the above problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies, this invention proposes a multi-seal hydrogen delivery ball valve based on pressure self-balancing. This invention primarily addresses the problem that when a ball valve is in the closed state, the valve stem deforms due to pressure imbalance on both sides caused by the gas pressure on the valve ball, leading to a decrease in the valve's sealing performance.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: a multi-seal hydrogen conveying ball valve based on pressure self-balancing, comprising a valve body; a left flange head is bolted to the left end of the valve body; a right flange head is bolted to the right end of the valve body; bottom supports are bolted to the sides of both the left and right flange heads; a first connecting seat is installed under the valve body, a support shaft is installed inside the first connecting seat, a valve ball is installed on the support shaft, a valve stem is installed on the valve ball, the valve stem is rotatably connected to the valve body, a second connecting seat is provided outside the valve stem, the second connecting seat is installed on the valve body, a worm gear is installed at the top of the valve stem, a worm is meshed with the worm gear, an installation cover is installed on the second connecting seat, the worm is rotatably connected to the installation cover, a connecting flange is installed at one end of the front of the worm, a shoulder is provided outside the valve stem, a limiting frame is provided outside the shoulder, and a threaded connection to the first connecting seat is provided through the limiting frame. The valve ball is fitted with two valve seats, each slidably connected to a support frame. The two support frames are installed inside the left and right flanges, respectively. A disc spring assembly is installed between the valve seats and the support frames. A first channel is formed inside the left flange. A second channel is formed inside the valve body, left flange, and right flange. A third channel is formed inside the right flange. The right flange communicates with the support frame inside the left flange through a vent formed by the first, second, and third channels. A seal is provided between the support shaft and the valve body. Packing is provided in the gap between the valve stem and the valve body. Sealing rings are provided between the left and right flanges and the valve body. Sealing rings are provided between the valve seats and the support frames. Sealing rings are provided between the support frames and the right and left flanges. When the ball valve is closed, the contact area between the right side of the valve ball and hydrogen is the same as the contact area between the left valve seat and the valve ball.

[0008] The disc spring assembly includes two disc springs and a support ring. The two disc springs are arranged in a horizontal straight line, and the ends of the two disc springs that are far apart from each other are respectively installed on the outer surface of the valve seat and the inner wall of the support frame. The support ring is installed between the two disc springs.

[0009] The two disc springs have different elastic forces.

[0010] The disc spring assembly also includes two washers, which are respectively installed on the surface of the support ring and the inner wall of the support frame.

[0011] A first pressure sensor is installed inside the first channel.

[0012] A second pressure sensor is connected through the valve body, a grease filling pipe is connected through the valve body, a solenoid valve is provided outside the grease filling pipe, and a high-pressure grease filling component is connected to the end of the grease filling pipe.

[0013] The right flange head and its internal support frame have a central hole that communicates with a third channel. A sealing pin is slidably connected in the central hole. The sealing pin has a connecting hole with the same inner diameter as the third channel. One end of the sealing pin outside the central hole is connected to a central plate. An electric push rod is installed on the side of the central plate and is installed inside the right flange head.

[0014] A third pressure sensor is connected through the right flange head.

[0015] The valve body and valve ball are made of ASTM A182 F316L.

[0016] Both the sealing ring and the sealing element are made of hydrogenated nitrile rubber.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. In this invention, when the ball valve is in the closed state, the upstream high-pressure hydrogen gas not only acts on the right side of the valve ball, but is also precisely guided to the left valve seat through the internally designed balancing channel. Since the gas pressure areas acting on the left and right sides of the valve ball are equal, the hydrostatic thrust on the valve ball in the axial direction achieves self-balancing, fundamentally eliminating the huge unbalanced torque generated by unidirectional pressure in traditional ball valves. This effectively ensures the structural stability of the valve stem and valve ball. Through the aforementioned pressure self-balancing mechanism, the valve ball no longer bears continuous unidirectional lateral thrust, thus avoiding the transmission of this unbalanced force to the valve stem. This significantly reduces the risk of valve stem damage due to long-term stress. The invention eliminates the risks of bending and fatigue deformation, while ensuring that the valve ball remains centered in the valve body and does not deflect due to pressure deviation. This significantly improves the overall sealing performance and service life of the ball valve. Because the structural stability of the valve ball and stem is guaranteed, on the one hand, the valve ball and the valve seats on both sides can always maintain uniform and reliable pre-tightening contact, ensuring zero leakage of the main seal; on the other hand, the stability of the valve stem also ensures its concentricity with the stuffing box, preventing premature failure of the valve stem seal due to valve stem wobbling. Therefore, the ball valve of this invention can maintain excellent sealing performance for a long time, greatly improving the operational safety and reliability under harsh hydrogen conditions.

[0019] 2. In this invention, a second pressure sensor is provided to monitor the pressure state within the sealed chamber in real time. When the valve seat and valve ball of the ball valve are intact, the pressure within the monitoring chamber remains constant. Once a minor leak or failure occurs in the main seal, high-pressure hydrogen will instantly seep into the chamber, causing the second pressure sensor to detect abnormal pressure fluctuations. At this time, it is diagnosed as a level one leak alarm, and the controller immediately activates the preset emergency program, automatically opens the solenoid valve, and drives the high-pressure grease filling component to quickly and accurately inject emergency sealing grease into the leak channel between the valve ball and the valve body. The injected sealing grease can quickly fill the leak gap and solidify to form a reliable temporary repair sealing barrier, thereby blocking hydrogen leakage in the shortest possible time and preventing a small leak from developing into a major safety accident.

[0020] 3. In this invention, when the second pressure sensor detects a risk of leakage in the main seal, the system automatically enters a high-pressure enhanced sealing mode. The controller drives the electric push rod to move the sealing pin to a specific position, thereby opening the internal balance channel. At this time, upstream high-pressure hydrogen is guided to the rear cavity of the valve seat, generating a fluid pressure thrust on the valve seat in the same direction as the disc spring force. This causes the valve seat to adhere tightly to the valve ball surface with a sealing specific pressure far exceeding the conventional pressure, forming a "pressure-assisted" active sealing effect, which can effectively curb leakage and significantly improve the reliability of the seal. When the third pressure sensor detects a low gas pressure in the pipeline, the system intelligently switches to a low-pressure, low-torque mode. The controller drives the electric push rod to move the sealing pin simultaneously... By blocking the internal balance channel, the valve seat relies solely on the preset elasticity of the disc spring assembly for sealing. Since there is no additional pressure from high-pressure gas on the valve seat, the lateral friction force experienced by the valve ball during rotation is significantly reduced. This design significantly reduces the opening torque of the ball valve under low-pressure conditions, making valve operation easier and faster, optimizing the user experience, and reducing the power consumption of the actuator. This invention achieves dynamic switching of the sealing strategy through intelligent sensing of pressure and leakage signals: under high pressure or leakage, it automatically enhances the sealing force to ensure safety; under low pressure, it automatically reduces the operating torque to improve efficiency. This adaptive capability ensures that the ball valve always operates within its optimal performance range, achieving a perfect balance between safety and economy. Attached Figure Description

[0021] The invention will now be further described with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional cross-sectional structure of the right flange head in this invention;

[0024] Figure 3 In this invention Figure 2 Enlarged structural diagram of section A;

[0025] Figure 4 This is a schematic diagram of the three-dimensional cross-sectional structure of the valve body in this invention;

[0026] Figure 5 In this invention Figure 4 Enlarged structural diagram of section B;

[0027] Figure 6 This is a schematic diagram of the three-dimensional structure of the electric actuator in this invention;

[0028] Figure 7 This is a frontal cross-sectional view of the present invention;

[0029] Figure 8 This is a frontal cross-sectional view of the ball valve in the closed state in this invention;

[0030] In the diagram: 1. Valve body; 2. Left flange; 3. Right flange; 4. First connecting seat; 5. Support shaft; 6. Valve ball; 7. Valve stem; 8. Second connecting seat; 9. Worm gear; 10. Worm; 11. Mounting cover; 12. Shoulder; 13. Limiting frame; 14. Connecting bolt; 15. Connecting flange; 16. Bottom bracket; 17. Valve seat; 18. Support frame; 19. Disc spring assembly; 191. Disc spring; 192. Support ring; 193. Washer ring; 20. Vent channel; 21. First channel; 22. Second channel; 23. Third channel; 24. First pressure sensor; 25. Second pressure sensor; 26. Grease filling pipe; 27. Solenoid valve; 28. Sealing pin; 29. ​​Connecting hole; 30. Intermediate plate; 31. Electric push rod; 32. Intermediate hole; 33. Third pressure sensor. Detailed Implementation

[0031] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0032] like Figures 1 to 8As shown, a pressure-self-balancing multi-seal hydrogen conveying ball valve includes a valve body 1; a left flange head 2 is bolted to the left end of the valve body 1; a right flange head 3 is bolted to the right end of the valve body 1; bottom brackets 16 are bolted to the sides of both the left flange head 2 and the right flange head 3; a first connecting seat 4 is installed under the valve body 1, a support shaft 5 is installed inside the first connecting seat 4, a valve ball 6 is installed on the support shaft 5, a valve stem 7 is installed on the valve ball 6, and the valve stem 7 is rotatably connected inside the valve body 1. A second connecting seat 8 is provided and is mounted on the valve body 1. A worm gear 9 is mounted on the top of the valve stem 7, and a worm 10 is meshed with the worm gear 9. A mounting cover 11 is mounted on the second connecting seat 8, and the worm 10 is rotatably connected inside the mounting cover 11. A connecting flange 15 is mounted on one end of the front of the worm 10. A shoulder 12 is provided on the outside of the valve stem 7, and a limiting frame 13 is provided on the outside of the shoulder 12. A connecting bolt 14 threaded into the first connecting seat 4 is passed through the limiting frame 13. Two valve seats are provided on the outside of the valve ball 6. 17. A support frame 18 is slidably connected to the valve seat 17. Two support frames 18 are respectively installed inside the left flange 2 and the right flange 3. A disc spring assembly 19 is installed between the valve seat 17 and the support frame 18. A first channel 21 is opened in the left flange 2. A second channel 22 is opened in the valve body 1, the left flange 2, and the right flange 3. A third channel 23 is opened in the right flange 3. A vent 20 is formed by the first channel 21, the second channel 22, and the third channel 23 inside the right flange 3. The valve body 1 is connected to the support frame 18 inside the left flange 2. A seal is provided between the support shaft 5 and the valve body 1. The gap between the valve stem 7 and the valve body 1 is filled with packing. Sealing rings are provided between the left flange 2, the right flange 3 and the valve body 1. Sealing rings are provided between the valve seat 17 and the support frame 18. Sealing rings are provided between the support frame 18 and the right flange 3 and the left flange 2. When the ball valve is in the closed state, the contact area between the right side of the valve ball 6 and the hydrogen is the same as the contact area between the left valve seat 17 and the valve ball 6.

[0033] The packing material used is polytetrafluoroethylene (PTFE) based packing material. PTFE has an extremely low coefficient of friction and excellent chemical inertness, and almost zero hydrogen permeability.

[0034] With the ball valve in the closed position, hydrogen gas is input through the right flange 3. At this time, the gas pressure from the hydrogen delivery pipeline acts on the right side of the valve ball 6 through the right flange 3. Simultaneously, the hydrogen gas in the delivery pipeline flows through the vent 20 to the inner wall of the support frame 18 inside the left flange 2, thus causing the gas pressure to act on the valve seat 17 inside the left flange 2. Therefore, the left side of the valve ball 6 is compressed by the gas pressure and the elastic force of the left disc spring assembly 19 through the left valve seat 17, and the right side of the valve ball 6 is also compressed by the gas pressure and the elastic force of the disc spring assembly 19. The elasticity of the valve ball is such that the contact area between the right side of the valve ball 6 and the hydrogen gas is the same as the contact area between the valve seat 17 and the valve ball 6 on the left side. Therefore, the area of ​​gas pressure acting on the surface of the ball valve on both sides is the same, so that the pressure on the left and right sides of the valve ball 6 is equal. This keeps the pressure on the left and right sides of the valve ball 6 in a balanced state, ensuring that the lateral force on the valve ball 6 and the valve stem 7 remains constant, reducing the probability of deformation of the valve stem 7 due to gas pressure, avoiding leakage between the valve stem 7 and the packing, and thus ensuring better sealing performance of the ball valve itself.

[0035] like Figures 3 to 5 As shown, the disc spring assembly 19 includes two disc springs 191 and a support ring 192. The two disc springs 191 are arranged in a horizontal straight line. The ends of the two disc springs 191 that are far apart from each other are respectively installed on the outer surface of the valve seat 17 and the inner wall of the support frame 18. The support ring 192 is installed between the two disc springs 191.

[0036] To accommodate the small stroke required for the valve seat 17 to fit the valve ball 6, a double disc spring 191 combination structure is adopted to provide stable rebound. This structure can achieve precise and controllable spring force output within a limited space, ensuring that the valve seat 17 always obtains a uniform and lasting sealing pressure, thereby improving the sealing reliability of the ball valve under frequent opening and closing.

[0037] The two disc springs 191 have different elastic forces.

[0038] Two disc springs 191, one with a larger elastic force and the other with a smaller elastic force, together form a composite elastic unit. Through stiffness matching, the finite linear displacement of a single disc spring 191 is extended into a longer, approximately linear composite working stroke. Within the extended working stroke, the composite elastic unit can output a smooth and highly stable elastic force, ensuring that even if normal wear occurs on the sealing surface between the valve ball 6 and the valve seat 17 during long-term operation, the valve seat 17 can still tightly fit the valve ball 6 under the action of stable elastic force, automatically compensate for the gap, and maintain an excellent sealing effect.

[0039] like Figure 5 As shown, the disc spring assembly 19 also includes two washers 193, which are respectively mounted on the surface of the support ring 192 and the inner wall of the support frame 18.

[0040] When the valve ball 6 presses the valve seat 17 horizontally, the valve seat 17 moves into the support frame 18. At this time, the valve seat 17 first compresses the disc spring 191 with less elastic force to deform. When the disc spring 191 with less elastic force is compressed but not to its limit, the washer ring 193 supports the disc spring 191, thereby avoiding excessive compression and damage to the disc spring 191 with less elastic force. Then the valve seat 17 continues to move to compress the disc spring 191 with greater elastic force. In this scheme, the disc spring 191 with less elastic force is compressed first, and then the disc spring 191 with greater elastic force is compressed, so as to achieve a larger range of elastic force applied to the valve ball 6, thereby ensuring that the disc spring assembly 19 applies a stable elastic force to the valve ball 6 and is not easily damaged by excessive compression and deformation.

[0041] like Figure 4 As shown, a first pressure sensor 24 is installed in the first channel 21.

[0042] The first pressure sensor 24 detects the air pressure in the vent 20. When the first pressure sensor 24 detects that the pressure value remains constant, it means that the pressure in the vent 20 is consistent with the hydrogen gas pressure in the hydrogen delivery pipe, the vent 20 is unobstructed, and at this time the left and right sides of the valve ball 6 are in a state of pressure balance, which makes it easy to judge whether it is in a balanced and sealed state based on the detection result of the first pressure sensor 24.

[0043] like Figure 2 As shown, a second pressure sensor 25 is connected through the valve body 1, a grease filling pipe 26 is connected through the valve body 1, a solenoid valve 27 is provided outside the grease filling pipe 26, and a high-pressure grease filling component is connected to the end of the grease filling pipe 26.

[0044] The second pressure sensor 25 is used to detect the pressure between the valve ball 6 and the valve body 1. When there is no leakage, the low-pressure air pressure between the valve ball 6 and the valve body 1 remains constant. When the second pressure sensor 25 detects an increase in pressure, it indicates that hydrogen has entered the gap between the valve ball 6 and the valve body 1, indicating a hydrogen leak. At this time, the controller controls the solenoid valve 27 to open, and the high-pressure grease filling component injects sealing grease between the valve ball 6 and the valve body 1 to complete the seal and prevent hydrogen from continuing to leak to the outside of the valve body 1, which could cause an explosion. This solution determines whether there is a leak between the valve ball 6 and the valve body 1 based on the value of the second pressure sensor 25, and promptly seals the leak, reducing the probability of hydrogen leaking to the outside of the valve body 1 and improving its safety.

[0045] The sealant uses a perfluoropolyether-based hydrogen-compatible resin, which has the characteristics of high stability and excellent sealing performance. It is also not prone to reacting with hydrogen, making the sealant even better.

[0046] like Figures 4 to 6As shown, a central hole 32 is provided in the right flange head 3 and its internal support frame 18. The central hole 32 is connected to the third channel 23. A sealing pin 28 is slidably connected in the central hole 32. A connecting hole 29 is provided on the sealing pin 28. The inner diameter of the connecting hole 29 is the same as the inner diameter of the third channel 23. A middle plate 30 is connected to one end of the sealing pin 28 outside the central hole 32. An electric push rod 31 is installed on the side of the middle plate 30. The electric push rod 31 is installed in the right flange head 3.

[0047] When the second pressure sensor 25 detects a leak between the valve ball 6 and the valve body 1, the controller extends the electric push rod 31. The electric push rod 31 drives the sealing pin 28 to move to the right via the intermediate plate 30 until the sealing pin 28 moves to the right side of the third channel 23. At this time, hydrogen gas smoothly passes through the vent channel 20 and the intermediate hole 32, allowing hydrogen gas to enter the left and right support frames 18. The gas pressure of the hydrogen gas acts on the valve seat 17, which in turn is squeezed against the surface of the valve ball 6 by the elastic force of the disc spring assembly 19 and the gas pressure. This increases the squeezing force on the right valve seat 17, making the contact between the valve seat 17 and the valve ball 6 tighter, thereby improving the sealing performance of the contact surface between the valve seat 17 and the valve ball 6, preventing hydrogen gas from continuing to leak and diffuse to the outside of the valve body 1, and improving overall safety.

[0048] like Figure 2 As shown, a third pressure sensor 33 is connected through the right flange head 3.

[0049] A third pressure sensor 33 is used to determine whether there is high-pressure hydrogen in the hydrogen delivery pipeline. If the gas pressure in the hydrogen delivery pipeline is low, the pressure exerted on the valve seat 17 by the gas pressure is small. Even without the pressure assistance of the gas pressure on the valve seat 17, the pressure on both sides of the valve ball 6 can still be kept in a relatively balanced state. At this time, the controller controls the electric push rod 31 to extend. The electric push rod 31 drives the intermediate plate 30 and the sealing pin 28 to move to the right until the sealing pin 28 blocks both the intermediate hole 32 and the third channel 23. At this time, the hydrogen pressure cannot pass through the intermediate hole 32 and the vent channel 20 to act on the valve seat 17. At this time, the valve seats 17 on both sides of the valve ball 6 are only subjected to the elastic force exerted by the disc spring assembly 19. Therefore, the valve ball 6 can still be in a balanced and sealed state. Moreover, since the pressure on the side of the valve ball 6 is reduced, the friction between the valve ball 6 and the valve seat 17 is smaller when rotating, making the subsequent adjustment of the valve stem 7 and the rotation of the valve ball 6 to open the ball valve easier and more convenient.

[0050] Valve body 1 and valve ball 6 are made of ASTM A182 F316L.

[0051] The valve body 1 and valve ball 6 are made of ASTM A182 F316L and undergo stress-relief annealing and low-temperature nitriding treatment. The low carbon content of ASTM A182 F316L fundamentally minimizes the formation of carbides, which are the main sites for hydrogen atom aggregation and lattice embrittlement. After stress-relief annealing, the stress level of the material is reduced to a minimum, which greatly reduces the risk of brittle fracture in a hydrogen environment. This gives the valve body 1 and valve ball 6, which are in direct contact with hydrogen, hydrogen embrittlement resistance and corrosion resistance. In addition, the low-temperature nitriding treatment forms a high-hardness nitride layer (bright white layer) in the sealing area of ​​the valve ball 6 and valve seat 17, which significantly improves wear resistance and anti-galling ability, ensuring that the valve can maintain a long-term and reliable seal even after frequent opening and closing.

[0052] Both the sealing ring and the sealing element are made of hydrogenated nitrile rubber.

[0053] The use of hydrogenated nitrile rubber with extremely high saturation and a denser molecular chain structure effectively blocks the penetration and diffusion of small hydrogen molecules, greatly reducing the amount of hydrogen leakage through the seals. Its excellent high temperature and pressure resistance can adapt to hydrogen throttling and heating or changes in ambient temperature, and it has strong resistance to extrusion deformation under high pressure hydrogen, maintaining the integrity of the sealing contact surface and making the sealing effect of the seals and sealing rings better.

[0054] During operation, when the ball valve is installed in the hydrogen delivery pipeline and is in the closed state, hydrogen is input through the right flange 3. The gas pressure in the hydrogen delivery pipeline acts on the right side of the valve ball 6. Simultaneously, the hydrogen in the hydrogen delivery pipeline passes through the vent 20 to the inner wall of the left support frame 18, thus causing the gas pressure to act on the left valve seat 17. The gas pressure and the elastic force of the left disc spring assembly 19 act on the left side of the valve ball 6 through the left valve seat 17. The right side of the valve ball 6 is subjected to the gas pressure and the elastic force of the disc spring assembly 19. Since the gas pressure on the left and right sides acts on the same area of ​​the ball valve surface, the pressure on the left and right sides of the valve ball 6 is in a balanced state. When the first pressure sensor 24 detects that the pressure value remains constant, it indicates that the left and right sides of the valve ball 6 are in a state of pressure balance. When the second pressure sensor 25 detects that the pressure value increases, it indicates that hydrogen has entered the gap between the valve ball 6 and the valve body 1, indicating that hydrogen leakage has occurred. At this time, the control solenoid valve 27 is opened, and sealing grease is injected into the valve ball 6 and valve body 1 through the high-pressure grease filling component. Between these points, a seal is formed to prevent further hydrogen leakage. When the third pressure sensor 33 detects a low pressure in the hydrogen delivery pipeline, no pressure self-balancing is required. The controller controls the electric push rod 31 to extend, causing the intermediate plate 30 and the sealing pin 28 to move to the right until the sealing pin 28 simultaneously blocks both the intermediate hole 32 and the third channel 23. At this point, the valve ball 6 is only subjected to the elastic force of the disc spring assembly 19 on both sides. When the third pressure sensor 33 detects a decrease in pressure, it indicates that the valve ball 6... When an internal hydrogen leak occurs, the controller extends the electric push rod 31, and the sealing pin 28 continues to move to the right, thereby releasing the blockage of the third channel 23. At the same time, the hydrogen delivery pipeline connects with the support frame 18 through the middle hole 32. Hydrogen enters both the left and right sides of the support frame 18, causing the valve seats 17 on both sides to be subjected to the gas pressure brought by the hydrogen. The valve seats 17 are pressed against the surface of the valve ball 6 by the elasticity of the disc spring assembly 19 and the gas pressure, thereby improving the sealing performance between the valve seats 17 and the surface of the valve ball 6.

[0055] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A multi-seal hydrogen conveying ball valve based on pressure self-balancing, comprising a valve body (1); characterized in that: A left flange head (2) is bolted to the left end of the valve body (1); a right flange head (3) is bolted to the right end of the valve body (1); bottom brackets (16) are bolted to the sides of both the left flange head (2) and the right flange head (3); a first connecting seat (4) is installed under the valve body (1); a support shaft (5) is installed inside the first connecting seat (4); a valve ball (6) is installed on the support shaft (5); a valve stem (7) is installed on the valve ball (6); the valve stem (7) is rotatably connected inside the valve body (1); a second connecting seat (8) is provided outside the valve stem (7); the second connecting seat (8) The valve stem (7) is mounted on the valve body (1); a worm gear (9) is mounted on the top of the valve stem (7); a worm (10) is meshed with the worm gear (9); a mounting cover (11) is mounted on the second connecting seat (8); the worm (10) is rotatably connected inside the mounting cover (11); a connecting flange (15) is mounted on one end of the front of the worm (10); a shoulder (12) is provided on the outside of the valve stem (7); a limiting frame (13) is provided on the outside of the shoulder (12); a connecting bolt (14) threadedly connected to the first connecting seat (4) is provided through the limiting frame (13); two valve seats (17) are provided on the outside of the valve ball (6). The valve seat (17) is slidably connected to a support frame (18); the two support frames (18) are respectively installed inside the left flange head (2) and the right flange head (3); a disc spring assembly (19) is installed between the valve seat (17) and the support frame (18); a first channel (21) is opened in the left flange head (2); a second channel (22) is opened in the valve body (1), the left flange head (2) and the right flange head (3); a third channel (23) is opened in the right flange head (3); the right flange head (3) has a ventilation channel formed by the first channel (21), the second channel (22) and the third channel (23). (20) It is connected to the inside of the support frame (18) inside the left flange (2); a seal is provided between the support shaft (5) and the valve body (1); a filler is provided in the gap between the valve stem (7) and the valve body (1); a sealing ring is provided between the left flange (2), the right flange (3) and the valve body (1); a sealing ring is provided between the valve seat (17) and the support frame (18); a sealing ring is provided between the support frame (18) and the right flange (3) and the left flange (2); and when the ball valve is in the closed state, the contact area between the right side of the valve ball (6) and the hydrogen is the same as the contact area between the left valve seat (17) and the valve ball (6).

2. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 1, characterized in that: The disc spring assembly (19) includes two disc springs (191) and a support ring (192); the two disc springs (191) are arranged in a horizontal straight line; the ends of the two disc springs (191) that are far apart from each other are respectively installed on the outer surface of the valve seat (17) and the inner wall of the support frame (18); the support ring (192) is installed between the two disc springs (191).

3. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 2, characterized in that: The two disc springs (191) have different elastic forces.

4. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 3, characterized in that: The disc spring assembly (19) also includes two washers (193); the two washers (193) are respectively installed on the surface of the support ring (192) and the inner wall of the support frame (18).

5. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 4, characterized in that: A first pressure sensor (24) is installed in the first channel (21).

6. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 5, characterized in that: A second pressure sensor (25) is connected through the valve body (1); a grease filling pipe (26) is connected through the valve body (1); a solenoid valve (27) is provided outside the grease filling pipe (26); and a high-pressure grease filling component is connected to the end of the grease filling pipe (26).

7. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 6, characterized in that: The right flange head (3) and its internal support frame (18) have an intermediate hole (32); the intermediate hole (32) communicates with the third channel (23); a sealing pin (28) is slidably connected in the intermediate hole (32); a connecting hole (29) is provided on the sealing pin (28); the inner diameter of the connecting hole (29) is the same as the inner diameter of the third channel (23); an intermediate plate (30) is connected to one end of the sealing pin (28) outside the intermediate hole (32); an electric push rod (31) is installed on the side of the intermediate plate (30); the electric push rod (31) is installed in the right flange head (3).

8. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 7, characterized in that: A third pressure sensor (33) is connected through the right flange head (3).

9. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 8, characterized in that: The valve body (1) and valve ball (6) are made of ASTM A182 F316L.

10. The multi-seal hydrogen conveying ball valve based on pressure self-balancing according to claim 9, characterized in that: Both the sealing ring and the sealing element are made of hydrogenated nitrile rubber.

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