Magnetic coupling driven liquid hydrogen stop valve

Abstract

The utility model relates to valve technical field especially relates to a kind of liquid hydrogen stop valve of magnetic coupling drive, including valve assembly, valve assembly includes valve body part and the movable part installed on valve body part, movable part is used to open or close valve body part, elastic member is installed on movable part, inductive unit is installed on valve body part, elastic member is used to exert pre-tightening force to movable part, inductive unit is used to detect the stress value of elastic member, drive assembly is installed on valve body part, when inductive unit detects the stress value of elastic member is F1, it sends signal to drive assembly;The utility model realizes the control to drive assembly by the stress change of conical spring, so that valve can make support assembly play the supporting effect to valve core in opening state, prevent the sliding of valve core caused by magnetic coupling device failure, ensure the safe use of valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a liquid hydrogen shut-off valve driven by magnetic coupling. Background Technology

[0002] Traditional valves require the drive shaft to penetrate the sealed housing, posing a risk of "dynamic seal" leakage. In contrast, the magnetically coupled gate valve transmits torque through a magnetic field, achieving a fully enclosed static seal. This completely prevents the leakage of cryogenic liquid hydrogen to the outside world and avoids mechanical parts from jamming due to friction at low temperatures, thus improving transmission reliability.

[0003] Because liquid hydrogen shut-off valves need to transmit cryogenic liquid hydrogen, they need to be isolated from external heat. Therefore, a vacuum layer can be designed between the valve shell and the internal flow cavity for insulation. In order to improve the stability of the shut-off valve when operating at low temperature and the tightness of the valve when closed, an automatic compensation device is usually selected to generate a pre-tightening force on the valve core to ensure a complete seal. However, because the magnetic coupling mechanism is easily damaged, once damaged, the valve core may slide naturally under the action of fluid and gravity, causing the valve's internal opening to decrease or even close.

[0004] Therefore, to address the above issues, a gate valve can be designed that supports the valve core when the valve is open, preventing the valve core from sliding due to the flow force and gravity of the medium when the magnetic coupling mechanism is damaged, thus affecting the passage of the medium. Utility Model Content

[0005] To overcome the problem that once a magnetically coupled shut-off valve is damaged, the valve core is prone to sliding under the action of the fluid medium, resulting in a smaller valve opening or even blockage.

[0006] The technical solution of this utility model is as follows: a magnetically coupled liquid hydrogen shut-off valve, comprising a valve assembly, the valve assembly including a valve body and a movable part mounted on the valve body, the movable part being used to open or close the valve body, an elastic element being mounted on the movable part, a sensing unit being mounted on the valve body, the elastic element being used to apply a preload to the movable part, the sensing unit being used to detect the stress value of the elastic element, a drive assembly being mounted on the valve body, and when the sensing unit detects a stress value F1 in the elastic element, it sends a signal to the drive assembly; a transmission assembly is movably connected to the valve body. The input end of the transmission component is connected to the output end of the drive component. A follower component is installed on the output end of the transmission component. The transmission component is used to drive the follower component to move. An air supply component is installed on the valve body. The input end of the air supply component is connected to the follower component. A support component is installed on the follower component. A sealing component is installed on the valve body. When the follower component moves, gas flows into the support component or the sealing component. When gas flows into the support component, the support component restricts the movement of the movable part. When gas flows into the sealing component, the sealing component covers the sealing surface between the valve body and the movable part.

[0007] Preferably, the valve body includes a valve seat, an outlet chamber disposed on one side of the valve seat, an inlet chamber disposed on the other side of the valve seat, and a valve passage disposed between the outlet chamber and the inlet chamber. When the movable part approaches and enters the valve passage, the outlet chamber and the inlet chamber are disconnected; when the movable part moves away from the valve passage, the outlet chamber and the inlet chamber are connected. The movable part includes a valve core movably connected in the valve seat, a magnetic coupler mounted on the valve seat, and a handwheel movably connected to the valve seat. The handwheel drives the valve core to approach or move away from the valve passage through the magnetic coupler.

[0008] Preferably, the elastic element includes a conical spring mounted on the valve core, which provides preload to the valve core and valve passage when the valve core approaches and enters the valve passage; the sensing unit includes a sensor mounted on the valve seat, which may be a tension sensor, with one end of the conical spring connected to the sensor, which is used to detect the stress value of the conical spring.

[0009] Preferably, the drive assembly includes a motor mounted on the valve seat and a drive gear mounted on the output end of the motor. The motor is used to drive the drive gear to rotate. The input end of the transmission assembly is connected to the drive gear. When the sensor detects that the stress value of the conical spring is F1, the drive gear drives the follower assembly to approach the valve core through the transmission assembly.

[0010] Preferably, the transmission assembly includes a threaded sleeve movably connected to the valve seat and a driven gear fixedly connected to it. The driven gear meshes with the driving gear, and the driving gear drives the threaded sleeve to rotate through the driven gear. The input end of the follower assembly is connected to the threaded sleeve.

[0011] Preferably, the follower assembly includes a lead screw threaded onto a lead sleeve, a support fixedly connected to one end of the lead screw, and a notch provided on the support. The lead sleeve is used to drive the lead screw to move along its axial direction. The input end of the air supply assembly is fixedly connected to the lead screw, and the lead screw is used to control the inflow or outflow of gas into the air supply assembly.

[0012] Preferably, the air supply assembly includes an air chamber disposed within a valve seat, a plunger and a plug head movably connected within the air chamber, the plug head being fixedly connected to one end of the plunger, and the other end of the plunger being fixedly connected to a lead screw, the lead screw being used to drive the plunger and plug head to move within the air chamber; when the plunger moves along the h1 direction, gas flows from the air chamber into the support assembly; when the plunger moves along the h2 direction, gas flows from the air chamber into the sealing assembly.

[0013] Preferably, the support assembly includes a first airbag installed in the notch and a first air supply pipe connected at one end to the first airbag. The other end of the first air supply pipe is connected to the air chamber. When the plunger moves along the h1 direction, gas flows from the air chamber into the first airbag through the first air supply pipe.

[0014] Preferably, the sealing assembly includes a slot fixedly installed on the valve passage, a second airbag installed in the slot, and a second air supply pipe connected at one end to the second airbag. The other end of the second air supply pipe is connected to the air chamber. When the plunger moves along the h2 direction, gas flows from the air chamber into the second airbag through the second air supply pipe.

[0015] Preferably, the signal transmission module includes a contact switch A mounted on the follower component and a contact switch B mounted on the support component. When the valve core moves along the h2 direction, the contact switch B contacts the contact switch A to energize and sends a signal to the drive component. The drive component drives the follower component to move along the h2 direction through the transmission component.

[0016] The beneficial effects of this utility model are:

[0017] 1. By using a valve seat structure with a vacuum insulation layer in conjunction with low-temperature alloy materials, heat transfer can be effectively isolated, ensuring the stable transmission of low-temperature media.

[0018] 2. The conical spring can pre-tighten the sealing surface between the valve core and the valve passage. By utilizing the small elastic deformation of its material at low temperatures or the pre-tightening force design, it can automatically compensate for the dimensional shrinkage caused by temperature changes and keep the sealing surface tightly fitted.

[0019] 3. The valve's on / off drive part is connected to the internal valve core through magnetic coupling. There is no direct mechanical contact between the internal and external parts, achieving a fully enclosed static seal, completely preventing low-temperature media from leaking to the outside, avoiding mechanical parts from jamming due to friction at low temperatures, and improving transmission reliability.

[0020] 4. The control of the drive component is achieved by the stress change of the conical spring, so that when the valve is open, the support component can support the valve core, preventing the valve core from sliding due to the failure of the magnetic coupling device, and ensuring the safe use of the valve.

[0021] 5. The use of sealing components creates an auxiliary sealing structure on the sealing surface between the valve core and the valve passage when the valve is closed, further reducing the risk of leakage. Attached Figure Description

[0022] Figure 1 The diagram shown is a three-dimensional structural schematic of the magnetically coupled liquid hydrogen shut-off valve of this utility model.

[0023] Figure 2 The diagram shown is a cross-sectional view of the magnetically coupled liquid hydrogen shut-off valve of this utility model.

[0024] Figure 3 The diagram shows the structure of the magnetically coupled liquid hydrogen shut-off valve drive assembly, transmission assembly, and follower assembly of this utility model.

[0025] Figure 4 The diagram shows the structure of the gas supply assembly, support assembly, and sealing assembly of the magnetically coupled liquid hydrogen shut-off valve of this utility model.

[0026] Figure 5 This invention presents a magnetically coupled liquid hydrogen shut-off valve. Figure 2 Enlarged view of point A in the middle;

[0027] Figure 6 This invention presents a magnetically coupled liquid hydrogen shut-off valve. Figure 2 Enlarged view of point B in the middle;

[0028] Figure 7 This invention presents a magnetically coupled liquid hydrogen shut-off valve. Figure 2 Enlarged view of point C in the middle;

[0029] Figure 8 This invention presents a magnetically coupled liquid hydrogen shut-off valve. Figure 2 Enlarged diagram of point D in the middle.

[0030] Explanation of reference numerals in the attached drawings: 101, valve seat; 102, liquid outlet chamber; 103, liquid inlet chamber; 104, valve passage; 105, valve core; 106, magnetic coupler; 107, handwheel; 201, conical spring; 202, sensor; 301, motor; 302, drive gear; 401, threaded sleeve; 402, driven gear; 501, lead screw; 502, support platform; 503, notch; 601, air chamber; 602, plunger; 603, plug; 701, first air bladder; 702, first air supply pipe; 801, slot; 802, second air bladder; 803, second air supply pipe; 901, contact switch A; 902, contact switch B. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Please see Figures 1-8This utility model provides an embodiment: a magnetically coupled liquid hydrogen shut-off valve, including a valve assembly. The valve assembly includes a valve body and a movable part mounted on the valve body. The movable part is used to open or close the valve body. An elastic element is mounted on the movable part, and a sensing unit is mounted on the valve body. The elastic element is used to apply a preload to the movable part, and the sensing unit is used to detect the stress value of the elastic element. A drive assembly is mounted on the valve body. When the sensing unit detects a stress value F1 in the elastic element, it sends a signal to the drive assembly. A transmission assembly is movably connected to the valve body, and the input end of the transmission assembly is connected to the output end of the drive assembly. The valve body is connected to a transmission assembly, which has a follower assembly mounted on its output end. The transmission assembly drives the follower assembly to move. An air supply assembly is mounted on the valve body, with its input end connected to the follower assembly. A support assembly is mounted on the follower assembly, and a sealing assembly is mounted on the valve body. When the follower assembly moves, gas flows into either the support assembly or the sealing assembly. When gas flows into the support assembly, it restricts the movement of the moving part. When gas flows into the sealing assembly, it covers the sealing surface between the valve body and the moving part. The valve body employs a vacuum insulation structure, with a vacuum designed between the valve shell and the internal flow cavity. The valve has a vacuum insulation layer (similar to a thermos flask) to prevent liquid hydrogen from evaporating due to heat absorption (liquid hydrogen has an extremely low boiling point, and even a small amount of heat can cause it to vaporize). It also prevents frost or ice buildup on the valve's outer surface, ensuring operational safety. The moving part is driven by magnetic coupling (in existing technology, the valve core 105 is connected via magnetic coupling, with no direct mechanical contact between internal and external components). When the user operates the moving part, the elastic element undergoes stress changes accordingly. When the sensing unit detects that the stress value reaches F1 (the moving part is in the open valve body state), it sends a signal to the drive assembly. The drive assembly then outputs power to the transmission assembly, which in turn controls the follower assembly. The moving assembly moves along the h1 direction and approaches the movable part. At the same time, the gas in the gas supply assembly flows into the support assembly. The support assembly is inflated and deformed to support the movable part, preventing the movable part from moving if the magnetic coupling mechanism fails. During the process of the movable part closing the valve body, the drive assembly outputs power in the opposite direction. In the above manner, the follower assembly moves along the h2 direction (note that the follower assembly and the movable part move together at this time), causing the gas in the gas supply assembly to flow into the sealing assembly. When the movable part closes the valve body, the sealing assembly covers the sealing surface between the valve body and the movable part to prevent the liquid hydrogen from leaking slightly.

[0033] Please see Figures 1-2 , Figure 5 and Figures 7-8In this embodiment, the valve body includes a valve seat 101, an outlet chamber 102 disposed on one side of the valve seat 101, an inlet chamber 103 disposed on the other side of the valve seat 101, and a valve passage 104 disposed between the outlet chamber 102 and the inlet chamber 103. When the movable part approaches and enters the valve passage 104, the outlet chamber 102 and the inlet chamber 103 are disconnected; when the movable part moves away from the valve passage 104, the outlet chamber 102 and the inlet chamber 103 are connected. The movable part includes a valve core 105 movably connected to the valve seat 101, a magnetic coupler 106 mounted on the valve seat 101, and a handwheel 107 movably connected to the valve seat 101. The handwheel 107 drives the valve core 105 to approach or move away from the valve passage 104 through the magnetic coupler 106. The elastic element includes a valve core 105 mounted on the valve core 101. The conical spring 201 on valve core 105 provides preload to valve core 105 and valve passage 104 when valve core 105 approaches and enters valve passage 104. The sensing unit includes a sensor 202 mounted on valve seat 101, which can be a tension sensor. One end of conical spring 201 is connected to sensor 202, which is used to detect the stress value of conical spring 201. The signal transmission module includes a contact switch A901 mounted on the follower assembly and a contact switch B902 mounted on the support assembly. When valve core 105 moves along h2, contact switch B902 contacts contact switch A901, energizes it, and sends a signal to the drive assembly. The drive assembly drives the follower assembly through the transmission assembly. Moving along the h2 direction, when the user turns the handwheel 107, power is output to the valve core 105 through the magnetic coupler 106, causing the valve core 105 to move (in existing technology, the working principle of the magnetic coupling actuator can be referred to; the magnetic coupling actuator transmits torque through a magnetic field, rotating the sleeve threaded to the valve core 105 in the air, achieving a fully enclosed static seal; the movement of the valve core 105 is controlled by threaded transmission; in practical applications, a directional device is also used to assist the valve core 105 in rotational limitation, etc.). When the valve core 105 moves along the h2 direction into the valve passage 104 (in the initial stage of movement, the valve core 105 will squeeze the support assembly, causing the contact switch B902 on it to contact the contact switch A901 and energize, sending a signal to the drive assembly), the liquid outlet chamber 1... When 02 and the inlet chamber 103 are disconnected, liquid hydrogen cannot flow. At the same time, the axial force generated by the elastic metal material of the conical spring 201 stabilizes the sealing surface pressure between the valve core 105 and the valve passage 104, avoiding sealing failure caused by vibration and pressure fluctuations (the material of the conical spring 201 will also produce slight elastic deformation at low temperatures, automatically compensating for the dimensional shrinkage caused by temperature changes). When the movable part moves to the preset position along the h1 direction, the conical spring 201 is compressed and the stress value is detected by the sensor 202 to reach F1. The sensor 202 sends a signal to the drive assembly (it is worth noting that, unlike the signals sent by the contact switch B902 and the contact switch A901, the drive assembly outputs power in opposite directions under the two signals received).

[0034] Please see Figures 2-8 In this embodiment, the drive assembly includes a motor 301 mounted on the valve seat 101 and a drive gear 302 mounted on the output end of the motor 301. The motor 301 drives the drive gear 302 to rotate. The input end of the transmission assembly is connected to the drive gear 302. When the sensor 202 detects that the stress value of the conical spring 201 is F1, the drive gear 302 drives the follower assembly closer to the valve core 105 through the transmission assembly. The transmission assembly includes a threaded sleeve 401 movably connected to the valve seat 101 and a driven gear 402 fixedly connected to it. The driven gear 402 meshes with the drive gear 302, and the drive gear 302 drives the threaded sleeve 401 to rotate through the driven gear 402. The input end of the follower assembly is connected to the valve core 105. The threaded sleeve 401; the follower assembly includes a screw 501 threadedly connected to the threaded sleeve 401, a support 502 fixedly connected to one end of the screw 501, and a notch 503 provided on the support 502. The threaded sleeve 401 is used to drive the screw 501 to move along its axial direction. The input end of the air supply assembly is fixedly connected to the screw 501. The screw 501 is used to control the inflow or outflow of gas into the air supply assembly. After receiving a signal, the motor 301 starts, controls the drive gear 302 to rotate and transmits power to the threaded sleeve 401 with the driven gear 402. When the threaded sleeve 401 rotates, it controls the screw 501 to move along the h1 or h2 direction (consistent with the moving direction of the moving part) through the threaded transmission action (similar to the existing ball screw).

[0035] Please see Figures 2-4 and Figures 6-8In this embodiment, the gas delivery assembly includes a gas chamber 601 disposed within the valve seat 101, a plunger 602 movably connected within the gas chamber 601, and a plug head 603. The plug head 603 is fixedly connected to one end of the plunger 602, and the other end of the plunger 602 is fixedly connected to a lead screw 501. The lead screw 501 is used to drive the plunger 602 and the plug head 603 to move within the gas chamber 601. When the plunger 602 moves along the h1 direction, gas flows from the gas chamber 601 into the support assembly; when the plunger 602 moves along the h2 direction, gas flows from the gas chamber... 601 flows into the sealing assembly; the support assembly includes a first airbag 701 installed in the recess 503 and a first air supply pipe 702 connected at one end to the first airbag 701, the other end of the first air supply pipe 702 being connected to the air chamber 601. When the plunger 602 moves along the h1 direction, gas flows from the air chamber 601 into the first airbag 701 through the first air supply pipe 702; the sealing assembly includes a slot 801 fixedly installed on the valve passage 104, a second airbag 802 installed in the slot 801, and a second airbag 802 connected at one end to the second airbag 801. The second gas supply pipe 803 on 02 is connected at one end to the gas chamber 601. When the plunger 602 moves along the h2 direction, gas flows from the gas chamber 601 into the second air bladder 802 through the second gas supply pipe 803. When the lead screw 501 moves along the h1 direction, the gas in the gas chamber 601 flows into the first air bladder 701 through the first gas supply pipe 702, causing the first air bladder 701 to inflate until it presses against the valve core 105 (when the magnetic coupler 106 fails, the valve core 105 will...). Under the reverse support force of the first airbag 701, it will not slide along the h2 direction due to medium disturbance or mechanical vibration, thus avoiding the situation where the valve core 105 closes the valve passage 104. When the lead screw 501 moves along the h2 direction, the gas in the air chamber 601 flows into the second airbag 802 through the second gas supply pipe 803, causing the second airbag 802 to expand until the second airbag 802 covers the sealing surface of the valve core 105 and the valve passage 104, preventing liquid hydrogen from flowing out from the gap between the valve core 105 and the valve passage 104.

[0036] During operation, the user turns the handwheel 107 to one side, which drives the valve core 105 to move along the h1 direction through the magnetic coupler 106. The conical spring 201 is compressed and its stress value reaches F1, which is detected by the sensor 202. The sensor sends a signal to the motor 301, which controls the drive gear 302 to rotate and transmits power to the threaded sleeve 401 with the driven gear 402. When the threaded sleeve 401 rotates, the screw 501 drives the plunger 602 to move along the h1 direction through the threaded transmission. The gas in the air chamber 601 flows into the first air bag 701 through the first air supply pipe 702, causing the first air bag 701 to inflate until the first air bag 701 abuts against the valve core 105. The valve passage 104 is opened, and the liquid outlet chamber 102 and the liquid inlet chamber 103 are connected.

[0037] The user turns the handwheel 107 to the other side, driving the valve core 105 to move along the h2 direction via the magnetic coupler 106. In the initial stage of movement, the valve core 105 squeezes the first air bag 701, causing the contact switch B902 on it to contact and energize with the contact switch A901, and sending a signal to the motor 301. The motor 301 controls the drive gear 302 to rotate in the opposite direction and transmits power to the threaded sleeve 401 with the driven gear 402. When the threaded sleeve 401 rotates, the screw 501 drives the plunger 602 to move along the h2 direction through the threaded transmission. The gas in the air chamber 601 flows into the second air bag 802 through the second air supply pipe 803, causing the second air bag 802 to expand until the second air bag 802 covers the sealing surface of the valve core 105 and the valve channel 104. At this time, the valve channel 104 is closed, and the liquid outlet chamber 102 and the liquid inlet chamber 103 are disconnected.

Claims

1. A magnetically coupled actuated liquid hydrogen stop valve comprising a valve assembly, characterized by: The valve assembly includes a valve body and a movable part mounted on the valve body. The movable part is used to open or close the valve body. An elastic element is mounted on the movable part, and a sensing unit is mounted on the valve body. The elastic element is used to apply a preload to the movable part, and the sensing unit is used to detect the stress value of the elastic element. A drive assembly is mounted on the valve body. When the sensing unit detects that the stress value of the elastic element is F1, it sends a signal to the drive assembly. A transmission assembly is movably connected to the valve body. The input end of the transmission assembly is connected to the output end of the drive assembly. A follower assembly is installed on the output end of the transmission assembly. The transmission assembly is used to drive the follower assembly to move. An air supply assembly is installed on the valve body. The input end of the air supply assembly is connected to the follower assembly. A support assembly is installed on the follower assembly, and a sealing assembly is installed on the valve body. When the follower assembly moves, gas flows into the support assembly or the sealing assembly. When gas flows into the support assembly, the support assembly restricts the movement of the moving part; when gas flows into the sealing assembly, the sealing assembly covers the sealing surface between the valve body and the moving part.

2. The magnetic coupling driven liquid hydrogen stop valve according to claim 1, characterized in that: The valve body includes a valve seat (101), an outlet chamber (102) disposed on one side of the valve seat (101), an inlet chamber (103) disposed on the other side of the valve seat (101), and a valve passage (104) disposed between the outlet chamber (102) and the inlet chamber (103). When the movable part approaches and enters the valve passage (104), the outlet chamber (102) and the inlet chamber (103) are disconnected; when the movable part moves away from the valve passage (104), the outlet chamber (102) and the inlet chamber (103) are connected. The movable part includes a valve core (105) movably connected in the valve seat (101), a magnetic coupler (106) mounted on the valve seat (101), and a handwheel (107) movably connected on the valve seat (101). The handwheel (107) drives the valve core (105) to move closer to or away from the valve passage (104) via the magnetic coupler (106).

3. The magnetic coupling driven liquid hydrogen stop valve according to claim 2, characterized in that: The elastic element includes a conical spring (201) mounted on the valve core (105), which provides a preload force at the valve core (105) and valve passage (104) when the valve core (105) approaches and enters the valve passage (104); The sensing unit includes a sensor (202) mounted on the valve seat (101). The sensor (202) can be a tension sensor (202). One end of a conical spring (201) is connected to the sensor (202). The sensor (202) is used to detect the stress value of the conical spring (201).

4. The magnetic coupling driven liquid hydrogen stop valve according to claim 3, characterized in that: The drive assembly includes a motor (301) mounted on the valve seat (101) and a drive gear (302) mounted on the output end of the motor (301). The motor (301) is used to drive the drive gear (302) to rotate. The input end of the transmission assembly is connected to the drive gear (302). When the sensor (202) detects that the stress value of the conical spring (201) is F1, the drive gear (302) drives the follower assembly to approach the valve core (105) through the transmission assembly.

5. The magnetic coupling driven liquid hydrogen stop valve according to claim 4, characterized in that: The transmission assembly includes a threaded sleeve (401) movably connected to the valve seat (101) and a driven gear (402) fixedly connected. The driven gear (402) meshes with the driving gear (302), and the driving gear (302) drives the threaded sleeve (401) to rotate through the driven gear (402). The input end of the follower assembly is connected to the threaded sleeve (401).

6. The magnetic coupling driven liquid hydrogen stop valve according to claim 5, characterized in that: The follower assembly includes a lead screw (501) threaded onto a lead sleeve (401), a support (502) fixedly connected to one end of the lead screw (501), and a notch (503) provided on the support (502). The lead sleeve (401) is used to drive the lead screw (501) to move along its axial direction. The input end of the air supply assembly is fixedly connected to the lead screw (501). The lead screw (501) is used to control the flow of gas into or out of the air supply assembly.

7. The magnetic coupling driven liquid hydrogen stop valve according to claim 6, characterized in that: The air supply assembly includes an air chamber (601) disposed in a valve seat (101), a plunger (602) and a plug (603) movably connected in the air chamber (601), the plug (603) being fixedly connected to one end of the plunger (602), and the other end of the plunger (602) being fixedly connected to a lead screw (501), the lead screw (501) being used to drive the plunger (602) and the plug (603) to move within the air chamber (601); When the plunger (602) moves along the h1 direction, gas flows from the gas chamber (601) into the support assembly; when the plunger (602) moves along the h2 direction, gas flows from the gas chamber (601) into the sealing assembly.

8. The magnetic coupling driven liquid hydrogen stop valve according to claim 7, characterized in that: The support assembly includes a first airbag (701) installed in the notch (503) and a first air supply pipe (702) with one end connected to the first airbag (701). The other end of the first air supply pipe (702) is connected to the air chamber (601). When the plunger (602) moves along the h1 direction, gas flows from the air chamber (601) into the first airbag (701) through the first air supply pipe (702).

9. A magnetically coupled liquid hydrogen shut-off valve according to claim 8, characterized in that: The sealing assembly includes a slot (801) fixedly installed on the valve passage (104), a second airbag (802) installed in the slot (801), and a second air supply pipe (803) with one end connected to the second airbag (802). The other end of the second air supply pipe (803) is connected to the air chamber (601). When the plunger (602) moves along the h2 direction, gas flows from the air chamber (601) into the second airbag (802) through the second air supply pipe (803).

10. The magnetic coupling driven liquid hydrogen stop valve according to claim 9, characterized in that: The signal transmission module includes a contact switch A (901) mounted on the follower component and a contact switch B (902) mounted on the support component. When the valve core (105) moves along the h2 direction, the contact switch B (902) contacts the contact switch A (901) and sends a signal to the drive component. The drive component drives the follower component to move along the h2 direction through the transmission component.

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