Low temperature self-compensating hydrogen tight shut-off valve

Abstract

The present application relates to the technical field of cut-off valve, and particularly relates to a low-temperature self-compensation hydrogen seal cut-off valve. The low-temperature self-compensation hydrogen seal cut-off valve comprises a valve shell, a valve seat arranged in the valve shell, a valve rod installed on the valve shell, a valve core fixed to the valve rod and located in the valve shell, and the valve core is used for plugging the valve seat. The low-temperature self-compensation hydrogen seal cut-off valve further comprises a sealing gasket fixed to the valve core and used for improving the sealing performance between the valve core and the valve seat, a mounting rod in penetrating rotary connection with the valve shell, a reset torsion spring arranged between the valve shell and the mounting rod, and a flow guide block fixed to the mounting rod and located in the valve shell. After the valve is closed, the flow guide block is obliquely arranged, the gas flow direction is changed, the direct impact of high-speed hydrogen on the core sealing structure is reduced, the damage probability of the valve under long-term high-frequency use condition is significantly reduced, and the overall service life of the cut-off valve is prolonged.

Description

Technical Field

[0001] This invention relates to the field of shut-off valve technology, and in particular to a cryogenic self-compensating hydrogen-sealed shut-off valve. Background Technology

[0002] Shut-off valves are a general term for valves used to connect or disconnect the medium in a pipeline. They mainly include gate valves, globe valves, ball valves, and plug valves. Among them, globe valves, as a type of forced-seal shut-off valve, are widely used in hydrogen energy transmission pipelines due to their relatively simple structure and good sealing performance. Their operational reliability is directly related to the safe operation of the entire hydrogen supply system.

[0003] However, when existing gate valves are applied to hydrogen transmission pipelines, a pressure difference gradually forms between the upstream and downstream sides during the closing process. This pressure difference increases continuously as the valve closes. As the high-pressure hydrogen passes through the narrow annular gap between the valve core and the valve seat, the flow velocity increases dramatically, exerting a hydrodynamic effect on the valve core. This easily induces valve core vibration, causing the sealing pair formed by the valve core and valve seat to be more prone to wear or damage compared to other valve components, resulting in a decrease in the overall service life of the valve. Summary of the Invention

[0004] In order to overcome the shortcomings of existing shut-off valves during normal use, the present invention provides a low-temperature self-compensating hydrogen-sealed shut-off valve.

[0005] The technical solution is: a cryogenic self-compensating hydrogen-sealed shut-off valve, comprising: A valve housing, wherein a valve seat is provided inside the valve housing, a valve stem is mounted on the valve housing, and a valve core located inside the valve housing is fixedly connected to the valve stem, the valve core being used to block the valve seat; Also includes: A sealing gasket, fixedly attached to the valve core, is used to improve the sealing performance between the valve core and the valve seat; A mounting rod is rotatably connected to the valve housing, and a return torsion spring is provided between the valve housing and the mounting rod; A drain block is fixedly connected to the mounting rod, and the drain block is located inside the valve body; A drive assembly is disposed on the valve housing, and the drive assembly is used to change the position of the drain block.

[0006] More preferably, the guide block is provided with symmetrically distributed inclined surfaces for guiding the gas inside the valve body.

[0007] More preferably, the driving component includes: A drive telescopic rod is fixedly connected to the valve housing. The telescopic end of the drive telescopic rod is slidably connected to the valve housing in a sealing manner. The telescopic end of the drive telescopic rod is in contact with the drain block. The first liquid storage shell is fixedly connected to the valve shell. The first liquid storage shell is slidably connected to the first piston rod. The first liquid storage shell and the fixed part of the drive telescopic rod are connected through a pipe. A compression rod is disposed on the valve stem, and the compression rod is used to compress the first piston rod.

[0008] More preferably, the horizontal distance between the telescopic end of the drive telescopic rod and the inlet end of the valve body is A, and the horizontal distance between the mounting rod and the inlet end of the valve body is B, where A < B.

[0009] More preferably, it also includes: Two fixed plates are symmetrically distributed and both are fixed to the valve body, with the first piston rod located between the two fixed plates; The movable plate has two symmetrically distributed plates, which are slidably connected to the corresponding fixed plates, and a first spring is fixed between the movable plate and the corresponding fixed plate; Two symmetrically distributed limiting blocks are fixedly connected to the corresponding moving plates. Each limiting block has an inclined surface. Each moving plate is fixedly connected to a pressing block. The pressing block is located on the side of the limiting block away from the first liquid storage shell. The pressing block has symmetrically distributed inclined surfaces. The pressing rod is used to press the inclined surfaces on the pressing block. A squeezing plate is fixedly connected to the first piston rod. The squeezing plate is slidably connected to both of the fixed plates. The squeezing rod is used to squeeze the squeezing plate. The limiting block is used to limit the squeezing plate. A second spring is fixedly connected between the first liquid storage shell and the first piston rod.

[0010] More preferably, the distance between the inclined surface on the limiting block and the central axis of the first piston rod decreases as the distance between the inclined surface on the limiting block and the first liquid storage shell decreases, and the distance between the symmetrically distributed inclined surfaces on the squeezing block increases as the distance between the two and the central axis of the first piston rod increases.

[0011] More preferably, the thickness of the limiting block is the same as the thickness of the extrusion block, and the minimum distance between the two limiting blocks is equal to the minimum distance between the two extrusion blocks and less than the width of the extrusion rod, and the width of the extrusion plate is equal to the width of the extrusion rod.

[0012] More preferably, it also includes: The second liquid storage shell is fixed to the valve shell. The second liquid storage shell is connected to the first liquid storage shell through a pipe. The second liquid storage shell is located on the side of the mounting rod near the outlet end of the valve shell. The second piston rod is slidably and sealed within the second liquid storage tank. The second piston rod is slidably and sealed with the valve housing. The second piston rod is used to push the drainage block. A reset tension spring is fixedly connected between the second piston rod and the second liquid storage tank.

[0013] More preferably, a first limiting plate is fixedly connected inside the valve housing. The first limiting plate is located on the side of the mounting rod near the outlet end of the valve housing, and the first limiting plate is used to limit the flow block.

[0014] More preferably, it also includes: A first hydraulic telescopic rod is fixed between the two fixed plates. A fourth spring is fixed between the telescopic end of the first hydraulic telescopic rod and the fixed part. The pressing rod is used to press the telescopic end of the first hydraulic telescopic rod. The second hydraulic telescopic rod is fixedly connected to the valve body, and the fixing part of the second hydraulic telescopic rod is connected to the fixing part of the first hydraulic telescopic rod through a pipe; The movable tube is slidably and sealed to the inlet end of the valve body; The second limiting plate is fixed to the side of the moving tube near the valve seat and is used to limit the flow block.

[0015] Compared with the prior art, the present invention has the following advantages: After the valve is closed, the present invention tilts the guide block to change the airflow direction, reduces the direct impact of high-speed hydrogen on the core sealing structure, significantly reduces the probability of valve damage under long-term high-frequency use conditions, and extends the overall service life of the shut-off valve.

[0016] By limiting the extrusion plate with the limiting block, the guide block is kept in an inclined state at the initial stage of valve opening, guiding the high-speed airflow to the side wall of the valve body, reducing the frontal impact force of hydrogen on the valve core at the moment of opening, and improving the stability and reliability of the valve opening process. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the valve housing of the present invention; Figure 3 This is a three-dimensional structural diagram of the valve stem and valve core of the present invention; Figure 4 This is a three-dimensional structural diagram of the valve core and sealing gasket of the present invention; Figure 5 This is a three-dimensional structural cross-sectional view of the first liquid storage shell of the present invention; Figure 6 This is a three-dimensional structural diagram of the limiting block and the extrusion block of the present invention; Figure 7This is a three-dimensional structural diagram of the moving tube and the second limiting plate of the present invention.

[0018] The components in the attached diagram are labeled as follows: 1. Valve housing, 2. Valve seat, 3. Valve stem, 4. Valve core, 5. Sealing gasket, 6. Mounting rod, 7. Drain block, 8. Drive telescopic rod, 9. First liquid reservoir, 10. First piston rod, 11. Extrusion rod, 12. Fixed plate, 14. Moving plate, 15. Limiting block, 16. Extrusion block, 17. Extrusion plate, 18. Second liquid reservoir, 19. Second piston rod, 20. First limiting plate, 21. First hydraulic telescopic rod, 22. Second hydraulic telescopic rod, 23. Moving tube, 24. Second limiting plate. Detailed Implementation

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0020] This embodiment provides a cryogenic self-compensating hydrogen-sealed shut-off valve, which aims to optimize the existing shut-off valve during the valve closing process. This is because the high-pressure hydrogen generated at the upstream and downstream of the shut-off valve causes the valve core to vibrate as it passes through the narrow annular gap between the valve core and the valve seat. This vibration causes the sealing pair formed by the valve core and the valve seat to be more prone to wear or damage than other parts of the valve, resulting in a decrease in the overall service life of the valve.

[0021] like Figures 1-4 and Figure 7 As shown, the valve includes: a valve body 1, a valve seat 2, and a valve stem 3. The valve seat 2 is disposed inside the valve body 1, and the valve stem 3 is mounted on the valve body 1. A valve core 4 located inside the valve body 1 is fixed to the valve stem 3. The valve core 4 is used to seal the valve seat 2. A sealing gasket 5 is fixed to the valve core 4 and is used to improve the sealing between the valve core 4 and the valve seat 2. A mounting rod 6 is rotatably connected to the valve body 1 through the valve body 1. A return torsion spring is disposed between the valve body 1 and the mounting rod 6. A drain block 7 is fixed to the mounting rod 6 and is located inside the valve body 1. A drive assembly is disposed on the valve body 1 and is used to change the position of the drain block 7.

[0022] In the above scheme, the left port of valve body 1 is the inlet end and the right port is the outlet end; the sealing gasket 5 is located on the lower side of valve core 4, and the upper side of valve seat 2 is provided with an inclined annular surface to improve the sealing performance between valve seat 2 and valve core 4; the sealing gasket 5 is made of polychlorotrifluoroethylene to reduce the influence of temperature on the shape of sealing gasket 5 and ensure that sealing gasket 5 can deform normally under the pressure of valve stem 3, thereby ensuring the sealing performance between sealing gasket 5 and valve seat 2; the guide block 7 is located inside valve body 1, and the mounting rod 6 is located on the upper side of the guide block 7. Under normal conditions, that is, when valve core 4 blocks valve seat 2, the guide block 7 is in an inclined state to guide hydrogen flow. The figure shows the state of valve seat 2 flow as an example. At this time, the guide block 7 is in a horizontal state, and the upper side of the guide block 7 is a horizontal surface to reduce the resistance during hydrogen flow; when the guide block 7 is in an inclined state, there are gaps between the front and rear sides of the guide block 7 and the inner wall of valve body 1.

[0023] like Figure 7 As shown, the guide block 7 is provided with symmetrically distributed inclined surfaces for guiding the gas in the valve body 1. The inclined surfaces on the guide block 7 are located on its lower side and are symmetrically distributed front and back.

[0024] like Figures 2-6 As shown, the drive assembly includes: a drive telescopic rod 8, fixedly connected to the valve housing 1, with the telescopic end of the drive telescopic rod 8 being slidably connected to the valve housing 1 and the telescopic end of the drive telescopic rod 8 being in contact with the drainage block 7; a first liquid storage shell 9, fixedly connected to the valve housing 1, with a first piston rod 10 slidably connected to the first liquid storage shell 9, and the first liquid storage shell 9 and the fixed part of the drive telescopic rod 8 being connected through a pipe; and a squeeze rod 11, disposed on the valve rod 3, which is used to squeeze the first piston rod 10.

[0025] In the above scheme, the drive telescopic rod 8 is located at the lower left of the valve housing 1. The figure shows the drive telescopic rod 8 in a retracted state as an example. When the drive telescopic rod 8 extends upward, it pushes the left side of the drainage block 7, causing the drainage block 7 to tilt. The first liquid storage shell 9 stores hydraulic oil. The extrusion rod 11 is provided with a through hole. The valve rod 3 is located in the through hole of the extrusion rod 11. The valve rod 3 is fixed with symmetrically distributed pressure plates, both of which are used to extrude the extrusion rod 11. In this embodiment, the extrusion rod 11 is fixed with the first piston rod 10. The right side of the extrusion rod 11 is provided with a through hole with a diameter larger than that of the valve rod 3. The two pressure plates on the valve rod 3 are located on the upper sides of the extrusion rod 11 to ensure the stability of the relative position of the extrusion rod 11 and the valve rod 3.

[0026] like Figure 4As shown, the horizontal distance between the extension end of the drive telescopic rod 8 and the inlet end of the valve body 1 is A, and the horizontal distance between the mounting rod 6 and the inlet end of the valve body 1 is B. A < B, which is used to reduce the resistance when the extension end of the drive telescopic rod 8 pushes the diversion block 7 to rotate, and to ensure that the diversion block 7 can rotate smoothly around the mounting rod 6.

[0027] The specific workflow of the above scheme is as follows: When this shut-off valve is needed, the operator first rotates the valve stem 3 to move the valve stem 3 downward. The valve stem 3 drives the valve core 4 and the sealing gasket 5 to move downward simultaneously. When the sealing gasket 5 comes into close contact with the valve seat 2, the sealing gasket 5 seals the valve seat 2, thereby putting the shut-off valve in the closed state.

[0028] As the valve stem 3 moves downward, the valve stem 3 drives the extrusion rod 11 to move downward synchronously via the two pressure plates on it. During this downward movement, the extrusion rod 11 drives the first piston rod 10 to move downward synchronously, forcing the hydraulic oil in the first reservoir 9 through the pipeline into the fixed part of the drive telescopic rod 8. This causes the telescopic end of the drive telescopic rod 8 to move upward, and during this upward movement, the telescopic end of the drive telescopic rod 8 presses upward against the lower left side of the drainage block 7, causing the drainage block 7 to rotate clockwise around the mounting rod 6. Figure 2 (Based on the perspective of the main view in the middle), during this process, the reset torsion spring on the mounting rod 6 is twisted to store force.

[0029] When the valve stem 3 moves downward to its limit position (i.e., when the sealing gasket 5 completes the sealing of the valve seat 2), the first piston rod 10 moves downward to its limit position simultaneously, keeping the drain block 7 in an inclined state. Then, the operator stops rotating the valve stem 3 and connects this shut-off valve to the hydrogen delivery pipeline.

[0030] After connecting this shut-off valve to the hydrogen delivery pipeline, when hydrogen needs to be transported, the operator rotates the valve stem 3 in the reverse direction. The valve stem 3 drives the valve core 4 and the sealing gasket 5 to move upward synchronously, releasing the blockage on the valve seat 2. During this process, the valve stem 3 drives the extrusion rod 11 to move upward synchronously. The extrusion rod 11 drives the first piston rod 10 to move upward synchronously, drawing the hydraulic oil introduced into the fixed part of the drive telescopic rod 8 back into the first liquid storage shell 9, causing the telescopic end of the drive telescopic rod 8 to reset downward, reducing the extrusion pressure on the drain block 7. As a result, the mounting rod 6 drives the drain block 7 to reset under the action of the reset torsion spring on it. The drain block 7 changes from an inclined state to a horizontal state, thus no longer obstructing the flow of hydrogen in the valve body 1, allowing the hydrogen to flow along the path from the left port to the right port of the valve body 1.

[0031] After transportation is completed, the staff will adjust the guide block 7 back to the tilted state according to the above operation. The tilt of the guide block 7 will guide the hydrogen in the hydrogen delivery pipe (guide the hydrogen to the side wall of the valve body 1), and at the same time reduce the flow rate of the hydrogen, thereby weakening the impact of the hydrogen on the valve core 4 and extending the overall service life of this shut-off valve. Example 2

[0032] Based on Example 1, this example further optimizes a low-temperature self-compensating hydrogen-sealed shut-off valve.

[0033] like Figures 2-6 As shown, it also includes: two fixed plates 12, symmetrically distributed, both fixed to the valve housing 1, with the first piston rod 10 located between the two fixed plates 12; two movable plates 14, symmetrically distributed, slidably connected to the corresponding fixed plates 12, with a first spring fixedly connected between the movable plates 14 and the corresponding fixed plates 12; two limiting blocks 15, symmetrically distributed, fixedly connected to the corresponding movable plates 14, with inclined surfaces on the limiting blocks 15, and a pressing block 16 fixedly connected to the movable plates 14, the pressing block 16 located on the side of the limiting blocks 15 away from the first liquid storage shell 9, with symmetrically distributed inclined surfaces on the pressing block 16, and a pressing rod 11 used to press the inclined surfaces on the pressing block 16; a pressing plate 17, fixedly connected to the first piston rod 10, with the pressing plate 17 slidably connected to both fixed plates 12, the pressing rod 11 used to press the pressing plate 17, the limiting blocks 15 used to limit the pressing plate 17, and a second spring fixedly connected between the first liquid storage shell 9 and the first piston rod 10.

[0034] In the above scheme, the two fixed plates 12 are symmetrically distributed front and back; when the first spring on the moving plate 14 is not compressed, the side of the moving plate 14 near the central axis of the first liquid storage shell 9 is flush with the side of the corresponding fixed plate 12 near the central axis of the first liquid storage shell 9; the extrusion plate 17 is located on the upper side of the first piston rod 10. In this embodiment, the first piston rod 10 and the extrusion rod 11 are not directly related. The second spring on the first piston rod 10 is always in a charged state to maintain the stability of the position of the first piston rod 10.

[0035] like Figure 6 As shown, the distance between the inclined surface of the limiting block 15 and the central axis of the first piston rod 10 decreases as the distance between the inclined surface of the limiting block 15 and the first liquid storage shell 9 decreases. The lower side of the limiting block 15 is a horizontal surface. When the limiting block 15 limits the extrusion plate 17, it ensures that the extrusion plate 17 cannot move upward. The distance between the symmetrically distributed inclined surfaces on the extrusion block 16 increases as the distance between the two and the central axis of the first piston rod 10 increases. The two inclined surfaces on the same extrusion block 16 are symmetrically distributed vertically.

[0036] like Figure 6As shown, the thickness of the limiting block 15 is the same as the thickness of the extrusion block 16. The minimum distance between the two limiting blocks 15 is equal to the minimum distance between the two extrusion blocks 16 and is less than the width of the extrusion rod 11. The width of the extrusion plate 17 is equal to the width of the extrusion rod 11. During the movement of the extrusion rod 11, the two extrusion blocks 16 are pushed apart, so that the horizontal distance between the two extrusion blocks 16 gradually increases. At the same time, when the extrusion rod 11 contacts the junction of the two inclined surfaces on the extrusion block 16, the minimum distance between the two extrusion blocks 16 reaches its maximum, and ensures that neither of the two limiting blocks 15 is on the moving path of the extrusion plate 17.

[0037] The specific workflow of the above scheme is as follows: As the valve stem 3 drives the extrusion rod 11 to move downward, the extrusion rod 11 drives the first piston rod 10 to move downward synchronously through the extrusion plate 17 (compressing the second spring on the first piston rod 10). As the extrusion plate 17 moves downward, it gradually contacts the inclined surfaces on the two extrusion blocks 16, causing the two extrusion blocks 16 to be squeezed and move away from each other (increasing the distance between the two extrusion blocks 16). The extrusion blocks 16 drive the corresponding moving plate 14 to move synchronously, and the moving plate 14 drives the corresponding limiting block 15 to move, compressing the first spring on the moving plate 14.

[0038] When the extrusion plate 17 moves down to contact the junction of the two inclined surfaces on the extrusion block 16, the distance between the two extrusion blocks 16 reaches its maximum. During the subsequent movement of the extrusion plate 17, the two extrusion blocks 16 move closer to each other under the action of the first spring on the corresponding moving plate 14 until the extrusion plate 17 moves down to lose contact with the extrusion blocks 16. Then, the two extrusion blocks 16 return to their initial positions relative to the corresponding fixed plate 12.

[0039] After the extrusion plate 17 loses contact with the extrusion block 16, as the extrusion plate 17 continues to move downward, it gradually contacts the two limiting blocks 15 and squeezes the two limiting blocks 15, causing the two limiting blocks 15 to move away from each other (driving the corresponding moving plate 14 to move synchronously). When the extrusion plate 17 moves downward to the position where it loses contact with the two limiting blocks 15, the two limiting blocks 15 are synchronously reset under the action of the first spring on the moving plate 14, thereby limiting the extrusion plate 17 and preventing the first piston rod 10 from resetting upward under the action of the second spring on it. At this time, the drain block 7 is in an inclined state.

[0040] During the upward movement of the valve stem 3 and the extrusion rod 11, the extrusion plate 17 is initially limited by the two limit blocks 15 and cannot move upward. When the extrusion rod 11 moves upward and contacts the inclined surfaces on the upper and lower sides of the extrusion block 16, as the extrusion rod 11 continues to move upward, the two extrusion blocks 16 are squeezed by the extrusion rod 11 and drive the corresponding limit blocks 15 to move synchronously. When the junction of the two inclined surfaces on the extrusion block 16 contacts the extrusion rod 11, the limit blocks 15 separate from the extrusion plate 17. At this time, the first piston rod 10 drives the extrusion plate 17 to move upward synchronously under the action of the second spring on it, thereby converting the flow block 7 from the inclined state to the horizontal state, realizing the delayed triggering operation, thereby reducing the probability of the valve core 4 vibrating due to the sudden impact of hydrogen during the opening process, and further improving the overall service life of the valve. Example 3

[0041] Based on Example 2, this example further optimizes a low-temperature self-compensating hydrogen-sealed shut-off valve.

[0042] like Figures 2-4 and Figure 7 As shown, it also includes: a second liquid storage shell 18, which is fixedly connected to the valve shell 1. The second liquid storage shell 18 is connected to the first liquid storage shell 9 through a pipe. The second liquid storage shell 18 is located on the side of the mounting rod 6 near the outlet end of the valve shell 1; a second piston rod 19, which is sealed and slidably connected inside the second liquid storage shell 18. The second piston rod 19 is sealed and slidably connected to the valve shell 1. The second piston rod 19 is used to push the drainage block 7. A reset tension spring is fixedly connected between the second piston rod 19 and the second liquid storage shell 18.

[0043] In the above scheme, the second liquid storage shell 18 is located below the valve shell 1 and to the right of the drive telescopic rod 8; the reset spring on the second piston rod 19 is always in a stored state to maintain the stability of the position of the second piston rod 19, and the elastic coefficient of the reset spring on the second piston rod 19 is less than the elastic coefficient of the first spring on the first piston rod 10; the second piston rod 19 is located to the right of the mounting rod 6.

[0044] The specific workflow of the above scheme is as follows: During the downward movement of the compression rod 11, the hydraulic oil in the first reservoir 9 flows through the pipeline to the fixed part of the drive telescopic rod 8 and the second reservoir 18. During this process, because the return spring in the second reservoir 18 is in a stored state, the return spring applies a downward pulling force to the second piston rod 19. As a result, the second piston rod 19 generates a suction force on the hydraulic oil in the first reservoir 9 during the downward movement, causing the hydraulic oil in the first reservoir 9 to flow preferentially into the second reservoir 18, thereby driving the second piston rod 19 to move downward first.

[0045] When the second piston rod 19 moves downward to its limit position (the second piston rod 19 is still partially in contact with the valve housing 1), the hydraulic oil in the first reservoir 9 begins to flow into the fixed part of the drive telescopic rod 8, causing the guide block 7 to change from a horizontal state to an inclined state. During this process, the guide block 7 is always in contact with the upper side of the second piston rod 19 (in order to reduce the friction between the guide block 7 and the second piston rod 19, a rolling ball can be set at the upper end of the second piston rod 19 in actual production).

[0046] During the upward movement of the first piston rod 10, the hydraulic oil in the fixed part of the drive telescopic rod 8 flows into the first reservoir 9. After the telescopic end of the drive telescopic rod 8 completes its reset, the hydraulic oil in the second reservoir 18 begins to flow into the first reservoir 9, causing the second piston rod 19 to begin to move upward. During the upward movement, the second piston rod 19 squeezes the right side of the guide block 7, applying an upward thrust to the right side of the guide block 7. This ensures that the guide block 7 is smoothly reset to a horizontal state under the combined action of the reset torsion spring on the mounting rod 6 and the second piston rod 19, thereby reducing the influence of hydrogen flow on the reset process of the guide block 7. Example 4

[0047] Based on Example 3, this example further optimizes a low-temperature self-compensating hydrogen-sealed shut-off valve.

[0048] like Figure 3 and Figure 7 As shown, a first limiting plate 20 is fixedly connected inside the valve housing 1. The first limiting plate 20 is located on the side of the mounting rod 6 near the outlet end of the valve housing 1. The first limiting plate 20 is used to limit the flow block 7.

[0049] In the above scheme, the first limiting plate 20 is located at the upper right part of the drainage block 7 and is used to limit the upper right side of the drainage block 7.

[0050] like Figures 2-5 As shown, it also includes: a first hydraulic telescopic rod 21, fixed between two fixed plates 12, with a fourth spring fixed between the telescopic end of the first hydraulic telescopic rod 21 and the fixed part; a pressing rod 11 for pressing the telescopic end of the first hydraulic telescopic rod 21; a second hydraulic telescopic rod 22, fixed to the valve body 1, with the fixed part of the second hydraulic telescopic rod 22 connected to the fixed part of the first hydraulic telescopic rod 21 through a pipe; a moving pipe 23, which is sealed and slidably connected to the inlet end of the valve body 1; and a second limiting plate 24, fixed to the side of the moving pipe 23 near the valve seat 2, for limiting the flow block 7.

[0051] In the above scheme, the first hydraulic telescopic rod 21 is located above the first piston rod 10, and the telescopic end of the first hydraulic telescopic rod 21 faces downward. The fourth spring on the first hydraulic telescopic rod 21 is always in a charged state. Initially, the telescopic end of the first hydraulic telescopic rod 21 is in contact with the extrusion rod 11. The second hydraulic telescopic rod 22 is located at the inlet end of the valve seat 2. In this embodiment, the inlet end of the valve seat 2 consists of two parts, left and right, which are connected by a bracket. The moving tube 23 is located at the inlet end of the valve body 1 and is used to connect the two parts of the inlet end of the valve body 1. The second limiting plate 24 is located at the lower right side of the moving tube 23 and is used to limit the upper left part of the drain block 7. When the valve seat 2 is fully open, the second limiting plate 24 is in the position of limiting the drain block 7, the telescopic end of the first hydraulic telescopic rod 21 is in a retracted state, the telescopic end of the second hydraulic telescopic rod 22 is in an extended state, and the extrusion plate 17 is not in contact with the extrusion rod 11.

[0052] The specific workflow of the above scheme is as follows: As the extrusion rod 11 moves downward, the extrusion force exerted by the extrusion rod 11 on the telescopic end of the first hydraulic telescopic rod 21 gradually decreases. Under the action of the fourth spring on it, the telescopic end of the first hydraulic telescopic rod 21 moves downward and draws the hydraulic oil in the fixed part of the second hydraulic telescopic rod 22 into the fixed part of the first hydraulic telescopic rod 21 through the pipeline, so that the telescopic end of the second hydraulic telescopic rod 22 retracts into its fixed part, thereby driving the moving tube 23 to move to the left, so that the contact position between the second limiting plate 24 and the diversion block 7 changes continuously.

[0053] When the extrusion rod 11 moves downward to contact the first piston rod 10, the telescopic end of the first hydraulic telescopic rod 21 is fully extended, and the second limiting plate 24 moves to the right to the position where it loses contact with the drainage block 7. Then, as the extrusion rod 11 moves downward, it separates from the telescopic end of the first hydraulic telescopic rod 21 and gradually extrudes the first piston rod 10, causing the telescopic end of the drive telescopic rod 8 to extend upward (the specific process can be referred to the above).

[0054] As the extrusion rod 11 moves upward, the first piston rod 10 moves upward under the action of the second spring, and the guide block 7 gradually turns into a horizontal state. When the extrusion rod 11 re-contacts the telescopic end of the first hydraulic telescopic rod 21, the guide block 7 is in a horizontal state. At the same time, the first limiting plate 20 limits the upper right side of the guide block 7 to prevent the guide block 7 from rotating counterclockwise around the mounting rod 6 under the action of hydrogen, thereby affecting the flow path of hydrogen in the valve body 1 and reducing the impact on the inner wall of the valve body 1.

[0055] As the extrusion rod 11 continues to move upward, it presses the telescopic end of the first hydraulic telescopic rod 21, causing the telescopic end of the first hydraulic telescopic rod 21 to move upward. This forces the hydraulic oil in the fixed part of the first hydraulic telescopic rod 21 into the fixed part of the second hydraulic telescopic rod 22, causing the telescopic end of the second hydraulic telescopic rod 22 to move the moving tube 23 to the right. This, in turn, causes the second limiting plate 24 to move to the right and re-contact the upper side of the right side of the diversion block 7, thus limiting the position of the diversion block 7. This ensures the stability of the position of the diversion block 7 during subsequent use, reduces the probability of vibration caused by the flow of hydrogen, and ensures that the hydrogen in the valve body 1 can flow smoothly.

[0056] The technical principles of the embodiments of the present invention have been described above with reference to specific examples. These descriptions are merely for explaining the principles of the embodiments of the present invention and should not be construed as limiting the scope of protection of the embodiments of the present invention in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of the present invention without creative effort, and these embodiments will all fall within the scope of protection of the embodiments of the present invention.

Claims

1. A cryogenic self-compensating hydrogen-sealed shut-off valve, comprising: A valve housing (1) is provided inside the valve housing (1), a valve seat (2) is provided inside the valve housing (1), a valve stem (3) is installed on the valve housing (1), and a valve core (4) located inside the valve housing (1) is fixed on the valve stem (3). The valve core (4) is used to block the valve seat (2). Its characteristic is that it further includes: A sealing gasket (5) is fixed to the valve core (4) to improve the sealing between the valve core (4) and the valve seat (2); The mounting rod (6) is rotatably connected to the valve housing (1) through the valve housing (1), and a return torsion spring is provided between the valve housing (1) and the mounting rod (6); A diversion block (7) is fixed to the mounting rod (6), and the diversion block (7) is located inside the valve body (1); A drive assembly is disposed on the valve housing (1) and is used to change the position of the drain block (7).

2. The cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 1, characterized in that, The guide block (7) is provided with symmetrically distributed inclined surfaces for guiding the gas inside the valve body (1).

3. The cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 1, characterized in that, The driving component includes: The drive telescopic rod (8) is fixed to the valve housing (1). The telescopic end of the drive telescopic rod (8) is in a sealed sliding connection with the valve housing (1). The telescopic end of the drive telescopic rod (8) is in contact with the drain block (7). The first liquid storage shell (9) is fixed to the valve shell (1). The first liquid storage shell (9) is slidably connected to the first piston rod (10). The first liquid storage shell (9) and the fixed part of the drive telescopic rod (8) are connected by a pipe. A squeeze rod (11) is disposed on the valve rod (3), and the squeeze rod (11) is used to squeeze the first piston rod (10).

4. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 3, characterized in that, The horizontal distance between the telescopic end of the drive telescopic rod (8) and the inlet end of the valve body (1) is A, and the horizontal distance between the mounting rod (6) and the inlet end of the valve body (1) is B, where A < B.

5. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 3, characterized in that, Also includes: The fixing plates (12) are symmetrically distributed and are fixed to the valve housing (1). The first piston rod (10) is located between the two fixing plates (12). The movable plate (14) has two symmetrically distributed plates, which are slidably connected to the corresponding fixed plate (12). A first spring is fixed between the movable plate (14) and the corresponding fixed plate (12). The limiting block (15) has two symmetrically distributed blocks, which are respectively fixed to the corresponding moving plate (14). The limiting block (15) is provided with an inclined surface. The moving plate (14) is fixed with a squeezing block (16). The squeezing block (16) is located on the side of the limiting block (15) away from the first liquid storage shell (9). The squeezing block (16) is provided with symmetrically distributed inclined surfaces. The squeezing rod (11) is used to squeeze the inclined surface on the squeezing block (16). The extrusion plate (17) is fixedly connected to the first piston rod (10). The extrusion plate (17) is slidably connected to both of the fixed plates (12). The extrusion rod (11) is used to extrude the extrusion plate (17). The limiting block (15) is used to limit the extrusion plate (17). A second spring is fixedly connected between the first liquid storage shell (9) and the first piston rod (10).

6. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 5, characterized in that, The distance between the inclined surface of the limiting block (15) and the central axis of the first piston rod (10) decreases as the distance between the inclined surface of the limiting block (15) and the first liquid storage shell (9) decreases, and the distance between the symmetrically distributed inclined surfaces on the squeezing block (16) increases as the distance between the two and the central axis of the first piston rod (10) increases.

7. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 6, characterized in that, The thickness of the limiting block (15) is the same as the thickness of the extrusion block (16), and the minimum distance between the two limiting blocks (15) is equal to the minimum distance between the two extrusion blocks (16) and less than the width of the extrusion rod (11). The width of the extrusion plate (17) is equal to the width of the extrusion rod (11).

8. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 5, characterized in that, Also includes: The second liquid storage shell (18) is fixed to the valve shell (1). The second liquid storage shell (18) is connected to the first liquid storage shell (9) through a pipe. The second liquid storage shell (18) is located on the side of the mounting rod (6) near the outlet end of the valve shell (1). The second piston rod (19) is sealed and slidably connected to the second liquid storage shell (18). The second piston rod (19) is sealed and slidably connected to the valve shell (1). The second piston rod (19) is used to push the drainage block (7). A reset spring is fixed between the second piston rod (19) and the second liquid storage shell (18).

9. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 8, characterized in that, A first limiting plate (20) is fixedly connected inside the valve housing (1). The first limiting plate (20) is located on the side of the mounting rod (6) near the outlet end of the valve housing (1). The first limiting plate (20) is used to limit the flow block (7).

10. A cryogenic self-compensating hydrogen-sealed shut-off valve according to claim 9, characterized in that, Also includes: The first hydraulic telescopic rod (21) is fixed between the two fixed plates (12). A fourth spring is fixed between the telescopic end of the first hydraulic telescopic rod (21) and the fixed part. The extrusion rod (11) is used to extrude the telescopic end of the first hydraulic telescopic rod (21). The second hydraulic telescopic rod (22) is fixed to the valve body (1), and the fixing part of the second hydraulic telescopic rod (22) is connected to the fixing part of the first hydraulic telescopic rod (21) through a pipe; The moving tube (23) is slidably and sealed to the inlet end of the valve body (1); The second limiting plate (24) is fixed to the side of the moving tube (23) near the valve seat (2) and is used to limit the flow block (7).

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