Electromagnetic cut-off valve for liquid hydrogen

Abstract

The application discloses a liquid hydrogen electromagnetic stop valve, which comprises a valve body and a control assembly. The valve body is provided with a coil carrier arranged in the valve body, a valve rod penetrating into the valve body and a medium channel for medium flow. The coil carrier is provided with a first movable channel coaxial with the valve rod. The control assembly comprises a static iron core, a movable iron core, an armature, a first coil, a permanent magnet and a second coil. One end of the static iron core is embedded in the upper port of the first movable channel. The first coil, the permanent magnet and the second coil are sequentially arranged on the coil carrier from top to bottom. The permanent magnet is composed of sectors of at least two magnetic cores magnetized radially along the axis. The movable iron core is arranged in the first movable channel. The lower end of the movable iron core is connected with an accommodating space in the interior. The upper end of the armature is elastically connected with a first spring. The first spring and the armature are arranged in the accommodating space and are connected with the movable iron core in linkage. The lower end of the armature is sequentially connected with a first valve rod, a second valve rod and a third valve rod.

Description

Technical Field

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

[0002] A liquid hydrogen solenoid valve is a control device for cryogenic colloidal fluids such as liquid hydrogen. It is mainly used to connect or disconnect liquid hydrogen media in pipelines, which is beneficial for industrial and scientific research production in cryogenic environments.

[0003] A search revealed that Chinese patent CN217653242U discloses a liquid hydrogen electromagnetic shut-off valve. This patent uses a single-coil control method, employing only one coil to control the opening and closing of the solenoid valve. In single-coil control, the opening and closing of the solenoid valve requires adjusting the current to change the magnetic field strength in the coil. Therefore, the response speed of the single-coil control method is relatively slow, and the required electrical energy input is relatively high. Summary of the Invention

[0004] The purpose of this invention is to provide a liquid hydrogen electromagnetic shut-off valve, which has lower energy consumption and longer lifespan, while improving the accuracy and reliability of the control system.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a liquid hydrogen electromagnetic shut-off valve, comprising a valve body, the valve body including a coil carrier disposed inside the valve body, a valve stem penetrating into the valve body, and a medium channel for medium flow, wherein a first movable channel coaxial with the valve stem is provided on the coil carrier; a control component, the control component including a stationary iron core, a movable iron core, an armature, a first coil, a permanent magnet, and a second coil, one end of the stationary iron core being embedded in the upper port of the first movable channel, the first coil, the permanent magnet, and the second coil being disposed sequentially from top to bottom on the coil carrier, the permanent magnet being composed of sectors radially magnetized along the axes of at least two magnetic cores, the movable iron core being disposed within the first movable channel, the lower end of the movable iron core being open and connected to an internal accommodating space, the upper end of the armature being elastically connected to a first spring, the first spring and the armature being disposed within the accommodating space and moving vertically in conjunction with the movable iron core, and the lower end of the armature being sequentially connected to a first valve stem, a second valve stem, and a third valve stem.

[0006] By adopting the above technical solution, two coils are used to control the opening or closing state of the solenoid valve when the power is turned on. The position of the permanent magnet in the middle acts as a selector. Only when the magnetic force of one of the coils is strong enough will the permanent magnet be attracted and the solenoid valve will be displaced, thereby realizing the control of the solenoid valve. When the control coil stops being powered or stops working, the permanent magnet can still maintain its own magnetization state, thus making the control process faster and more precise.

[0007] The present invention is further configured such that the valve body includes an electromagnetic upper cover, an electromagnetic lower cover, a valve cover, and a lower valve body, the electromagnetic upper cover and the electromagnetic lower cover are bolted together, the valve cover has an upwardly extending long neck, the long neck is threadedly connected to the electromagnetic lower cover, and the valve cover is bolted together with the valve body.

[0008] By adopting the above technical solution, the valve body adopts a modular design, and the different parts are connected by bolts, which makes it convenient for users to disassemble and install, facilitates maintenance and repair, and the entire valve body structure is compact, making it less prone to loosening and failure during operation, greatly improving safety and stability.

[0009] The present invention is further configured such that the lower valve body includes a vacuum insulation shell and a vacuum layer, and the vacuum insulation shell is provided with a vacuum pumping connector.

[0010] By adopting the above technical solutions, the vacuum insulation shell and vacuum layer can prevent heat exchange, thereby preventing the liquid from changing due to temperature during transportation, and have better insulation performance. The vacuum joint can facilitate customers to vacuum later, so as to maintain the vacuum insulation effect.

[0011] The present invention is further configured such that a second movable channel with a valve stem displacement axis is provided inside the long neck, and a heat insulation layer, a second valve stem and a heat insulation box are provided inside the second movable channel. The second valve stem is filled with foamed polyethylene in the middle, and at least one graphene heat insulation sheet is placed inside the heat insulation box. A heat insulation pad is provided between the valve cover and the lower valve body.

[0012] By adopting the above technical solution, a heat insulation layer, a second valve stem, and a heat insulation box are set in the second movable channel of the valve stem displacement axis. This can prevent heat from being conducted along the valve stem to the valve cover and lower valve body, and also prevent the low temperature of the medium from being conducted to the valve cover. It can effectively isolate external heat, thereby reducing the valve's ability to conduct heat, reducing the valve's thermal expansion and contraction and aging phenomenon, and enhancing the valve's durability.

[0013] The invention is further configured such that a piston and a flexible rubber diaphragm cooperating with the piston are connected below the third valve stem. The piston is linked to the third valve stem and has a second spring at its upper end. The flexible rubber diaphragm is fixed to the valve body and has a pressure-reducing hole and a flow hole. The medium channel is divided into an inlet end, an outlet end, and a connecting cavity. The pressure-reducing hole connects to the inlet end, and the flow hole connects the outlet end and the connecting cavity. The second spring, the piston, and the flexible sealing diaphragm are disposed in the connecting cavity. The connecting cavity is separated from the second movable channel with a long neck by a sealing cap. The sealing cap is fitted into the lower opening, and one end of the second spring is tightly attached to the sealing cap and applies a vertically upward elastic force.

[0014] By adopting the above technical solution, the pressure reduction effect is achieved through the pressure reduction holes and flow holes on the flexible rubber diaphragm, which can control the pressure of the medium within a controllable range and ensure the stability and safety of the valve. Due to the synergistic effect of the piston and the flexible rubber diaphragm, the second moving channel of the valve can be effectively sealed. The flexible rubber diaphragm has high toughness, can be bent without breaking, and is not easily deformed when exposed to temperature changes, thereby enhancing the durability of the valve.

[0015] The present invention is further configured such that the lower valve body and the valve cover are respectively provided with a protrusion and a groove, and a sealing ring is provided in the groove. The valve cover and the lower valve body are tightened by bolts, so that the protrusion is embedded in the groove and pressed tightly against the sealing ring.

[0016] By adopting the above technical solution, the fitting of the protrusions and grooves, as well as the compression of the sealing ring, a good seal can be achieved between the valve cover and the lower valve body, which can effectively prevent the medium from overflowing and ensure the sealing performance of the valve.

[0017] The present invention is further configured such that a bearing is provided on the periphery of the second valve stem for sliding cooperation with it, and the bearing is fixed on the inner wall of the valve body.

[0018] By adopting the above technical solution, the bearing can reduce the friction between the second valve stem and the inner wall of the valve body, making the up-and-down movement of the valve stem easier, reducing the energy consumption of the solenoid valve to a certain extent, and also reducing wear and extending service life.

[0019] The present invention is further configured such that the coil carrier is provided with a detachable first outer shell, a second outer shell, and a third outer shell from the inside out, and an energy storage coil is provided between the first outer shell and the second outer shell.

[0020] By adopting the above technical solution, the design of the coil mounting carrier allows the first, second, and third outer shells to be detached from the coil mounting carrier. This makes maintenance or coil replacement more convenient and improves maintenance ease.

[0021] The present invention is further configured such that one end of the first valve stem and the third valve stem have a T-shaped head, and both ends of the second valve stem are provided with T-shaped grooves. The first valve stem, the second valve stem and the third valve stem are connected by the T-shaped head and the T-shaped groove. The lower end of the armature is provided with a semi-circular groove, and one end of the first valve stem is provided with a semi-circular groove that fits into the semi-circular groove.

[0022] By adopting the above technical solution, the valve stem is prevented from being too long, which would lead to insufficient rigidity, inability to withstand large compressive forces or torques, easy deformation or damage, and affect the normal operation of the valve. The segmented design makes the valve stem easier to disassemble and maintain.

[0023] The present invention is further configured such that an anti-collision pad is provided on the stationary iron core, and a buffer ring that cooperates with the anti-collision pad is provided on the movable iron core.

[0024] By adopting the above technical solutions, the anti-collision pad can reduce collision and wear during use, maintain the flatness and smoothness of its surface, thereby improving the service life of the valve. Furthermore, by setting a buffer ring on the moving iron core, it can work with the anti-collision pad to buffer the movement of the iron core, reducing vibration and noise caused by impact or friction, making the valve work more smoothly and quietly.

[0025] The beneficial effects of the present invention are as follows: The present invention provides a solenoid valve that can improve response speed and reduce energy consumption. The dual coil can improve the response speed of the valve, and the use of permanent magnets can reduce the electrical energy input required for the coil, thereby saving energy consumption, reducing costs, making the solenoid valve more environmentally friendly, and improving the performance and efficiency of the dual coil solenoid valve. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0027] Figure 1 A schematic diagram of the overall structure of the invention;

[0028] Figure 2 This is a schematic cross-sectional view of the overall structure of the present invention;

[0029] Figure 3 for Figure 2 Enlarged structural diagram of section A in the middle;

[0030] Figure 4 for Figure 2 Enlarged structural diagram of section B in the middle;

[0031] Figure 5 for Figure 2 Enlarged structural diagram of section C;

[0032] Figure 6 for Figure 2 Enlarged structural diagram of section D in the middle;

[0033] Figure 7 This is an exploded view of the control component in one embodiment of the present invention;

[0034] Figure 8This is an exploded view of the valve stem in one embodiment of the present invention.

[0035] In the diagram, 1. Valve body; 10. Valve stem; 11. First valve stem; 111. Semicircle; 112. T-head; 12. Second valve stem; 121. Polyethylene foam; 122. T-slot; 13. Third valve stem; 2. Electromagnetic top cover; 21. Third outer shell; 22. Second outer shell; 23. First outer shell; 24. Coil carrier; 241. First coil; 242. Second coil; 243. Permanent magnet; 244. Movable iron core; 245. Armature; 2451. Semicircular slot; 246. First spring; 247. First movable channel; 25. Energy storage coil; 26. Stationary iron core; 261. Anti-collision pad; 26 2. Buffer ring; 3. Electromagnetic lower cover; 4. Long neck; 41. Thermal insulation layer; 411. Bearing; 42. Second active channel; 43. Thermal insulation box; 431. Graphene thermal insulation sheet; 5. Valve cover; 51. Thermal insulation pad; 52. Groove; 53. Sealing ring; 6. Lower valve body; 60. Medium channel; 61. Connecting cavity; 611. Flexible rubber diaphragm; 6111. Pressure reducing hole; 6112. Flow hole; 612. Piston; 613. Second spring; 62. Inlet end; 63. Outlet end; 64. Vacuum insulation shell; 641. Vacuum connection; 65. Vacuum layer; 66. Sealing cap; 67. Protrusion. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0038] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0039] A liquid hydrogen electromagnetic shut-off valve, such as Figures 1 to 8As shown, the system includes a valve body 1, which comprises a coil carrier 24 disposed inside the valve body 1, a valve stem 10 penetrating inside the valve body 1, and a medium channel 60 for medium flow. The coil carrier 24 has a first movable channel 247 coaxial with the valve stem 10. This first movable channel 247 is cylindrical and interconnected vertically. A control assembly includes a stationary iron core 26, a movable iron core 244, an armature 245, a first coil 241, a permanent magnet 243, and a second coil 242. The permanent magnet 243 is a magnetic material capable of generating a persistent magnetic field, the direction and magnitude of which are related to the magnet's structure. One end of the stationary iron core 26 is detachably embedded in the upper port of the first movable channel 247. The diameter of one end of the stationary iron core 26 is slightly smaller than that of the first movable channel 247, while the other end... The diameter is larger than the first movable channel 247. The first coil 241, permanent magnet 243, and second coil 242 are arranged sequentially from top to bottom on the coil carrier 24. The permanent magnet 243 is composed of sectors radially magnetized along the axes of at least two magnetic cores. The permanent magnet 243 is mounted on the hub of the coil carrier 24. The movable iron core 244 is arranged inside the first movable channel 247. The movable iron core 244 has an internal accommodating space. The lower end of the movable iron core 244 is connected to the first movable channel 247. The upper end of the armature 245 has a shoulder that engages with the first spring 246. The first spring 246 and the armature 245 are arranged in the accommodating space and move up and down with the movable iron core 244. The lower end of the armature 245 is sequentially connected to the first valve stem 11, the second valve stem 12, and the third valve stem 13. In operation, the upper and lower coils control the opening and closing states of the solenoid valve, respectively. When the upper coil is powered by an external power source, it generates a magnetic field. A permanent magnet 243, composed of four radially magnetized sector-shaped regions with four magnetic cores, interacts with the magnetic field within the permanent magnet 243, causing it to generate a first upward magnetic flux. This flux gradually increases upwards, thus opening the solenoid valve. When the lower coil is powered by an external power source, it also generates a magnetic field. This magnetic field interacts with the magnetic field within the permanent magnet 243, causing it to generate a second downward magnetic flux. This flux gradually decreases downwards, thus closing the solenoid valve. The sector-shaped permanent magnet 243 allows for more precise control over the direction and magnitude of the magnetic field, resulting in a higher magnetic field strength and better stability. This better meets the needs of different application conditions and makes disassembly and assembly easier. Using the permanent magnet 243 reduces the electrical energy input required for the coil, thereby saving energy consumption and reducing operating costs. It also makes the solenoid valve more environmentally friendly and improves the performance and efficiency of the dual-coil solenoid valve.

[0040] like Figure 1As shown, the valve body 1 includes an electromagnetic upper cover 2, an electromagnetic lower cover 3, a valve cover 5, and a lower valve body 6. The electromagnetic lower cover 3 has symmetrically arranged handles. A sealing gasket is placed between the electromagnetic upper cover 2 and the electromagnetic lower cover 3. The electromagnetic upper cover 2 and the electromagnetic lower cover 3 are connected on the left and right sides by bolts, two nuts, and washers. The valve cover 5 has an upwardly extending long neck 4, which is threaded to the electromagnetic lower cover 3. The valve cover 5 is connected to the valve body 1 by six bolts. The valve body 1 adopts a modular design, with different parts connected by bolts, facilitating user disassembly and installation, maintenance, and repair. Furthermore, the entire valve body 1 has a compact structure, making it less prone to loosening and malfunctions during operation, greatly improving safety and stability.

[0041] like Figure 2 and Figure 5 As shown, a second movable channel 42, the displacement axis of the valve stem 10, is provided within the long neck 4. The second movable channel 42 contains a heat insulation layer 41, a second valve stem 12, and a heat insulation box 43. The second valve stem 12 is filled with polyethylene foam 121. The heat insulation box 43 is trapezoidal and has an openable cover on the side near the lower valve body. At least one graphene heat insulation sheet 431 is placed inside the heat insulation box 43. The third valve stem 13 passes through the heat insulation box 41 from the middle. A heat insulation pad 51 is provided at the connection between the valve cover 5 and the lower valve body 6. The heat insulation layer 41, the second valve stem 12, and the heat insulation box 43 within the second movable channel 42, the displacement axis of the valve stem 10, prevent heat from being conducted along the valve stem 10 to the valve cover 5 and the lower valve body 6. It also prevents the low temperature of the medium from being conducted above the valve cover 5. This effectively isolates external heat, thereby reducing the valve's heat conduction capacity, reducing thermal expansion and contraction and aging, and enhancing the valve's durability.

[0042] like Figure 6 As shown, the lower valve body 6 includes a vacuum-insulated outer shell 64 and a vacuum layer 65. A vacuum-drawing connector 641 is provided on the vacuum-insulated outer shell 64. This vacuum-drawing connector is stepped and connected to a mating sealing cap via threads. The vacuum-insulated outer shell 64 and the vacuum layer 65 prevent heat exchange, thereby preventing the liquid from changing due to temperature variations during transportation, resulting in better insulation performance. The vacuum-drawing connector 641 allows customers to easily perform vacuuming later, maintaining the vacuum insulation effect.

[0043] like Figure 2 and Figure 5As shown, a piston 612 and a flexible rubber diaphragm 611 that cooperates with the piston 612 are connected below the third valve stem 13. The third valve stem 13 passes through the piston 612. The end of the third valve stem 13 connected to the piston 612 is provided with a shoulder. The piston 612 is provided with a groove that cooperates with the shoulder of the third valve stem 13. The piston 612 and the third valve stem 13 are linked together, and a second spring 613 is provided at the upper end. One end of the second spring 613 is in close contact with the piston 612. The flexible rubber diaphragm 611 is fixed on the valve body 1. The flexible rubber diaphragm 611 is provided with a pressure reducing hole 6111 and a flow hole 6112. The medium channel 60 is divided into an inlet end 62, an outlet end 63 and a connecting cavity 61. The pressure reducing hole 6111 connects to the inlet end 62, and the flow hole 6112 connects the outlet end 63 and the connecting cavity 61. When the valve is closed... When closed, the flow hole 6112 is blocked by the piston 612 pressed above. The second spring 613, piston 612 and flexible sealing diaphragm are arranged in the connecting cavity 61. When the medium flows in from the inlet end, the medium flows into the connecting cavity 61 through the pressure reducing hole 6111. At this time, the fluid pressure acting on the piston 612 is canceled. When the valve is opened, the medium first flows out through the flow hole 6112. Because the outflow is greater than the inflow, a pressure drop is generated. This pressure difference causes the flexible rubber diaphragm 611 to bend. The medium flows out through the bottom of the flexible rubber diaphragm 611. At this time, the inflow and outflow are almost the same. The connecting cavity 61 and the second movable channel 42 of the long neck 4 are separated by the sealing cover 66. The sealing cover 66 is fitted into the lower opening. One end of the second spring 613 is close to the sealing cover 66 and applies a vertical upward elastic force. The pressure reduction effect is achieved through the pressure reducing hole 6111 and the flow hole 6112 on the flexible rubber diaphragm 611, which can control the pressure of the medium within a controllable range and ensure the stability and safety of the valve. Due to the synergistic effect of the piston 612 and the flexible rubber diaphragm 611, the valve port passage can be effectively sealed. The flexible rubber diaphragm 611 is made of highly tough material, which can be bent without breaking and is not easily deformed when exposed to temperature changes, thereby enhancing the durability of the valve.

[0044] like Figure 5 As shown, the lower valve body 6 and the valve cover 5 are respectively provided with a protrusion 67 and a groove 52. A sealing ring 53 is provided in the groove 52. The valve cover 5 and the lower valve body 6 are tightened by bolts, so that the protrusion 67 is embedded in the groove 52 and pressed tightly against the sealing ring 53. The engagement of the protrusion 67 and the groove 52, as well as the pressing of the sealing ring 53, can achieve a good seal between the valve cover 5 and the lower valve body 6, which can effectively prevent the medium from overflowing and ensure the sealing performance of the valve.

[0045] like Figure 4As shown, a bearing 411 is provided around the second valve stem 12 for sliding cooperation with it, and the bearing 411 is fixed to the inner wall of the valve body 1. The bearing 411 can reduce the friction between the second valve stem 12 and the inner wall of the valve body 1, making the up-and-down movement of the valve stem 10 easier, reducing the energy consumption of the solenoid valve to a certain extent, and also reducing wear and extending service life.

[0046] like Figure 7 As shown, the coil carrier 24 has a detachable first outer shell 23, a second outer shell 22, and a third outer shell 21 arranged from the inside out. An energy storage coil 25 is disposed between the first outer shell 23 and the second outer shell 22. The design of the coil carrier 24 allows the first outer shell 23, the second outer shell 22, and the third outer shell 21 to be removed from the coil carrier 24. This makes it easier to operate when repairing or replacing the coil, improving the convenience of maintenance.

[0047] like Figure 8 As shown, the first valve stem 11 and the third valve stem 13 have a T-shaped head 112 at one end, and the second valve stem 12 has T-shaped grooves 122 at both ends. The first valve stem 11, the second valve stem 12, and the third valve stem 13 are connected by the T-shaped head 112 and the T-shaped grooves 122. The lower end of the armature 245 has a semi-circular groove 2451, and one end of the first valve stem 11 has a semi-circular groove 111 that fits into the semi-circular groove 2451. To avoid the valve stem 10 being too long, which would lead to insufficient rigidity and inability to withstand large compressive forces or torques, making it prone to deformation or damage and affecting the normal operation of the valve, the segmented design allows the valve stem 10 to be easily disassembled and maintained.

[0048] like Figure 3 As shown, the stationary iron core 26 is equipped with an anti-collision pad 261, and the movable iron core 244 is equipped with a buffer ring 262 that cooperates with the anti-collision pad 261. The anti-collision pad 261 can reduce collision and wear during use, keep its surface flat and smooth, thereby improving the service life of the valve. Furthermore, by setting the buffer ring 262 on the movable iron core 244, it can cooperate with the anti-collision pad 261 to buffer the movement of the movable iron core 244, reducing vibration and noise caused by impact or friction, making the valve work more smoothly and quietly.

[0049] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A liquid hydrogen electromagnetic shut-off valve, characterized in that, include: The valve body (1) includes a coil carrier (24) disposed inside the valve body (1), a valve stem (10) penetrating inside the valve body (1), and a medium passage (60) for medium flow. The coil carrier (24) is provided with a first movable channel (247) coaxial with the valve stem (10). The control component includes a stationary iron core (26), a movable iron core (244), an armature (245), a first coil (241), a permanent magnet (243), and a second coil (242). One end of the stationary iron core (26) is embedded in the upper port of the first movable channel (247). The first coil (241), the permanent magnet (243), and the second coil (242) are arranged sequentially from top to bottom on the coil carrier (24). The permanent magnet (243) consists of sectors radially magnetized along the axes of at least two magnetic cores. The movable iron core... The core (244) is set in the first movable channel (247), so the movable core (244) has a accommodating space inside. The lower end of the movable core (244) is connected to the accommodating space. The upper end of the armature (245) is elastically connected to the first spring (246). The first spring (246) and the armature (245) are set in the accommodating space and move up and down with the movable core (244). The lower end of the armature (245) is sequentially connected to the first valve stem (11), the second valve stem (12), and the third valve stem (13). The valve body (1) includes an electromagnetic upper cover (2), an electromagnetic lower cover (3), a valve cover (5) and a lower valve body (6). The electromagnetic upper cover (2) is bolted to the electromagnetic lower cover (3). The valve cover (5) has an upwardly extending long neck (4). The long neck (4) is threaded to the electromagnetic lower cover (3). The valve cover (5) is bolted to the lower valve body (6). The long neck (4) is provided with a second movable channel (42) coaxial with the displacement of the valve stem (10). The second movable channel (42) is provided with a heat insulation layer (41), a second valve stem (12) and a heat insulation box (43). The second valve stem (12) is filled with foamed polyethylene (121). At least one graphene heat insulation sheet (431) is placed in the heat insulation box (43). A heat insulation pad (51) is provided between the valve cover (5) and the lower valve body (6). A piston (612) and a flexible rubber diaphragm (611) cooperating with the piston (612) are connected below the third valve stem (13). The piston (612) is linked to the third valve stem (13) and a second spring (613) is provided at its upper end. The flexible rubber diaphragm (611) is fixed on the valve body (1). The flexible rubber diaphragm (611) is provided with a pressure reducing hole (6111) and a flow hole (6112). The medium channel (60) is divided into an inlet end (62), an outlet end (63), and a connecting cavity (61). The pressure reducing hole (611) is... 11) Connect the inlet end (62) and the connecting cavity (61). The flow hole (6112) connects the outlet end (63) and the connecting cavity (61). The second spring (613), piston (612) and flexible sealing diaphragm are arranged in the connecting cavity (61). The connecting cavity (61) and the second movable channel (42) of the long neck (4) are separated by the sealing cap (66). The sealing cap (66) is fitted into the lower opening of the second movable channel (42). One end of the second spring (613) is close to the sealing cap (66) and applies a vertically upward elastic force.

2. The liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The lower valve body (6) includes a vacuum insulation shell (64) and a vacuum layer (65), and a vacuum connector (641) is provided on the vacuum insulation shell (64).

3. The liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The lower valve body (6) and the valve cover (5) are respectively provided with a protrusion (67) and a groove (52). A sealing ring (53) is provided in the groove (52). The valve cover (5) and the lower valve body (6) are tightened by bolts, so that the protrusion (67) is embedded in the groove (52) and pressed against the sealing ring (53).

4. The liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The second valve stem (12) is provided with a bearing (411) that slides up and down with it, and the bearing (411) is fixed on the inner wall of the valve body (1).

5. A liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The coil carrier (24) is provided with a detachable first outer shell (23), a second outer shell (22) and a third outer shell (21) from the inside to the outside, and an energy storage ring (25) is provided between the first outer shell (23) and the second outer shell (22).

6. The liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The first valve stem (11) and the third valve stem (13) have a T-head (112) at one end, and the second valve stem (12) has T-slots (122) at both ends. The first valve stem (11), the second valve stem (12) and the third valve stem (13) are connected by the T-head (112) and the T-slots (122) engaging. The lower end of the armature (245) is provided with a semi-circular groove (2451), and one end of the first valve stem (11) is provided with a semi-circular groove (111) that fits into the semi-circular groove (2451).

7. A liquid hydrogen electromagnetic shut-off valve as described in claim 1, characterized in that, The stationary iron core (26) is provided with an anti-collision pad (261), and the movable iron core (244) is provided with a buffer ring (262) that cooperates with the anti-collision pad (261).

Images