High-pressure stop valve for liquid hydrogen system

Abstract

The present application relates to the technical field of stop valve, especially to a high-pressure stop valve for liquid hydrogen system, which aims at the problem that the existing stop valve may be damaged due to the high-pressure environment in the system, the high-pressure environment may generate certain pressure on the overall structure, and the structure is easily damaged, so that the sealing property of the stop valve is poor and liquid hydrogen is leaked, and proposes the following technical scheme: a valve body, which comprises a valve pipe and liquid inlet and outlet pipes connected to both sides of the valve pipe; a valve disc assembly installed in the valve body, which has two states of closing and opening, and when the valve disc assembly is completely closed, it is tightly sealed with the bottom of the valve pipe and can effectively cut off the flow of fluid; and an adjusting assembly for driving the valve disc assembly to adjust. The present application can be applied to the high-pressure environment in the liquid hydrogen system, is not easily damaged by high pressure in the closed state, has stable structure, good sealing effect and low liquid hydrogen leakage.

Description

Technical Field

[0001] This invention relates to the field of shut-off valve technology, and more particularly to a high-pressure shut-off valve for liquid hydrogen systems. Background Technology

[0002] A gate valve, also known as a stop valve, is a forced-seal valve. Therefore, when the valve is closed, pressure must be applied to the valve disc to ensure a leak-proof seal. When the medium enters the valve from below the valve disc, the resistance that the operating force needs to overcome is the frictional force of the valve stem and packing, plus the thrust generated by the pressure of the medium. The force required to close the valve is greater than the force required to open it, so the valve stem diameter must be larger; otherwise, the valve stem may bend. Gate valves are classified into three types according to their connection method: flange connection, threaded connection, and welded connection. Since the advent of self-sealing valves, the medium flow direction in gate valves has changed to entering the valve cavity from above the valve disc. In this case, under the action of medium pressure, the force required to close the valve is smaller, while the force required to open it is larger, allowing for a corresponding reduction in the valve stem diameter. Simultaneously, this type of valve is also more leak-proof under the action of the medium.

[0003] A liquid hydrogen system is a device and facility used for storing, transporting, and applying liquid hydrogen. Liquid hydrogen is the liquid form of hydrogen gas at extremely low temperatures (-253°C), possessing high energy density and broad application prospects. Currently, when used in liquid hydrogen systems, the high-pressure environment makes it difficult for the shut-off valve to maintain a good seal, leading to liquid hydrogen leakage. Furthermore, when the shut-off valve is closed, the high-pressure environment may exert pressure on the overall structure, potentially causing structural damage and further deteriorating the valve's sealing performance, resulting in liquid hydrogen leakage. Therefore, this invention proposes a high-pressure shut-off valve for liquid hydrogen systems. Summary of the Invention

[0004] The purpose of this invention is to address the problem that existing shut-off valves in the background art may suffer structural damage due to high-pressure environments in the system, resulting in poor sealing performance and liquid hydrogen leakage. The invention proposes a high-pressure shut-off valve for liquid hydrogen systems.

[0005] The technical solution of the present invention: a high-pressure shut-off valve for a liquid hydrogen system, comprising:

[0006] The valve body includes a valve tube and an inlet pipe and an outlet pipe connected to both sides thereon;

[0007] The valve disc assembly installed in the valve body has two states: closed and open. When the valve disc assembly is completely closed, it is tightly sealed to the bottom of the valve pipe, which can effectively cut off the flow of fluid.

[0008] An adjustment component is used to adjust the valve disc assembly. The adjustment component can control the flow rate of fluid by adjusting the opening degree of the valve disc assembly. The adjustment component is fixedly connected to the valve pipe by multiple sets of fasteners.

[0009] Optionally, the valve body also includes a connecting pipe between the valve pipe and the inlet pipe. The inlet pipe and the outlet pipe are both equipped with flanges at the ends away from the valve pipe, and the flanges have multiple sets of connection holes.

[0010] Optionally, the valve disc assembly includes a mounting plate disposed in a valve tube, a fixing cylinder mounted at the bottom of the mounting plate, a sealing sleeve fitted around the outer ring of the fixing cylinder, a stop plate disposed below the sealing sleeve, the stop plate being threadedly connected to the fixing cylinder, and a first sealing ring mounted on the stop plate.

[0011] Optionally, multiple sets of positioning strips are installed on the outer side of the fixed cylinder, and multiple sets of positioning grooves corresponding to the positioning strips are opened on the inner wall of the sealing sleeve. The outer diameter of the stop plate is larger than the outer diameter of the positioning groove.

[0012] Optionally, the side of the fixed cylinder is provided with a first through hole corresponding to the connecting pipe, and the side of the sealing sleeve is provided with a second through hole corresponding to the connecting pipe.

[0013] Optionally, the adjusting assembly includes a fixed plate fixedly connected to the top of the valve pipe by multiple sets of fasteners. A fixed cover is installed on the top of the fixed plate. The fixed plate and the fixed cover are rotatably connected by a bearing to multiple sets of threaded sleeves. The top end of the threaded sleeve protrudes from the surface of the fixed cover, and the bottom end of the threaded sleeve penetrates through the fixed plate. Limiting rings are fitted on both ends of the threaded sleeve.

[0014] Optionally, the threaded sleeve is threadedly connected to a threaded rod, the bottom end of which is fixedly connected to the top of the mounting plate, and the other end of which is fixedly connected to a limit frame. The limit frame is U-shaped, and multiple sets of limit holes are opened at the bottom of the limit frame. Limit rods are slidably connected in the limit holes, and the bottom end of the limit rods is fixedly connected to the fixed plate.

[0015] Optionally, a connecting rod is fixedly connected to the top of the limiting rod, and multiple sets of the connecting rods are fixedly connected to a fixing frame. The fixing frame is fixedly installed on the top of the fixing plate, and a rotating rod is rotatably connected to the fixing frame. A handwheel is installed on the top of the rotating rod.

[0016] Optionally, a first gear is fixedly connected to the end of the rotating rod away from the handwheel, and a second gear is fitted onto the outer ring of both sets of threaded sleeves, with the first gear meshing with the second gear.

[0017] Optionally, a second sealing ring is also provided between the fixed disc and the valve pipe.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] This invention utilizes a valve body to allow fluid to flow in through the inlet pipe and out through the outlet pipe. The valve assembly effectively cuts off fluid flow. A connecting pipe allows fluid from the inlet pipe to enter the fixed cylinder when the valve assembly is closed, thus balancing the pressure on both sides of the shut-off plate and effectively reducing the pressure burden on the structure. The threaded connection between the shut-off plate and the fixed cylinder facilitates the replacement of the sealing sleeve. An adjustable handwheel engages two sets of second gears, causing the threaded sleeve to rotate and, via the threaded rod, move the entire valve assembly upwards, opening the valve assembly and allowing fluid flow.

[0020] This invention is applicable to high-pressure environments in liquid hydrogen systems. It is not easily damaged by high pressure when in the closed state, has a stable structure, good sealing effect, and prevents liquid hydrogen leakage. Attached Figure Description

[0021] Figure 1 This is a front view of a high-pressure shut-off valve for a liquid hydrogen system.

[0022] Figure 2 yes Figure 1 The front view;

[0023] Figure 3 yes Figure 1 Top view;

[0024] Figure 4 yes Figure 1 Side view;

[0025] Figure 5 yes Figure 1 A schematic diagram of the cross-sectional structure;

[0026] Figure 6 This is a schematic diagram of the disassembled structure of the valve disc assembly;

[0027] Figure 7 yes Figure 5 Enlarged view of point A in the middle;

[0028] Figure 8 yes Figure 1 A cross-sectional view;

[0029] Figure 9 This is a schematic diagram of the adjustment component;

[0030] Figure 10 yes Figure 9 A partial sectional view;

[0031] Figure 11 yes Figure 1 The main view shows the valve assembly in the open state;

[0032] Figure 12 yes Figure 11 A schematic diagram of the cross-sectional structure.

[0033] Figure label:

[0034] 1. Valve body; 11. Valve pipe; 12. Inlet pipe; 13. Outlet pipe; 14. Connecting pipe; 15. Flange; 16. Connection hole;

[0035] 2. Valve disc assembly; 21. Mounting plate; 22. Fixing cylinder; 23. Sealing sleeve; 24. Stop plate; 25. First sealing ring; 26. Positioning strip; 27. Positioning groove; 221. First through hole; 231. Second through hole;

[0036] 3. Adjustment assembly; 301. Fixed plate; 302. Fixed cover; 303. Threaded sleeve; 304. Limiting ring; 305. Threaded rod; 306. Limiting frame; 307. Limiting hole; 308. Limiting rod; 309. Connecting rod; 310. Fixed frame; 311. Rotating rod; 312. Handwheel; 313. First gear; 314. Second gear; 315. Second sealing ring;

[0037] 4. Fasteners. Detailed Implementation

[0038] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0040] 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.

[0041] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example

[0043] like Figure 1-4 As shown, the present invention proposes a high-pressure shut-off valve for a liquid hydrogen system, comprising a valve body 1. The valve body 1 includes a valve pipe 11 and an inlet pipe 12 and an outlet pipe 13 connected to both sides of the valve body 1. Both the inlet pipe 12 and the outlet pipe 13 are connected to the valve body 1 to facilitate fluid passage; fluid flows in through the inlet pipe 12 and flows out through the outlet pipe 13. The valve body 1 also includes a connecting pipe 14 connecting the valve pipe 11 and the inlet pipe 12, which are also connected. A flange 15 is installed at the end of the inlet pipe 12 and the outlet pipe 13 furthest from the valve pipe 11. Multiple sets of connection holes 16 are provided on the flange 15. The flange 15 and the connection holes 16 facilitate the overall installation of the valve body 1 and its connection to other pipelines.

[0044] At the same time, such as Figure 5 and Figure 6As shown, the aforementioned shut-off valve includes a valve disc assembly 2 installed in the valve body 1. The valve disc assembly 2 has two states: closed and open. When the valve disc assembly 2 is fully closed, it tightly seals against the bottom of the valve pipe 11, effectively cutting off the flow of fluid. The valve disc assembly 2 includes a mounting plate 21 disposed in the valve pipe 11. A fixed cylinder 22 is installed at the bottom of the mounting plate 21, and the fixed cylinder 22 moves synchronously with the mounting plate 21. A sealing sleeve 23, made of rubber, is fitted around the outer ring of the fixed cylinder 22, making it in close contact with the inner wall of the valve pipe 11, thus ensuring good sealing when the valve disc assembly 2 moves. A shut-off disc 24 is also disposed below the sealing sleeve 23, which is threadedly connected to the fixed cylinder 22. The outer diameter of the shut-off disc 24 is larger than the outer diameter of the positioning groove 27. The shut-off disc 24 is used to limit the sealing sleeve 23, preventing it from leaving the position of the fixed cylinder 22. At the same time, the shut-off disc 24 is in close contact with the bottom opening of the valve pipe 11, achieving fluid cut-off. A first sealing ring 25 is installed on the stop plate 24. The first sealing ring 25 ensures that the fluid will not overflow after the stop plate 24 cuts off the fluid, providing good sealing performance. A first through hole 221 corresponding to the connecting pipe 14 is opened on the side of the fixed cylinder 22, and a second through hole 231 corresponding to the connecting pipe 14 is opened on the side of the sealing sleeve 23. The opening of the first through hole 221 and the second through hole 231 allows the fluid in the inlet pipe 12 to enter the fixed cylinder 22 through the connecting pipe 14, thereby preventing high-pressure fluid from applying pressure to one side of the stop plate 24. Fluid exists on both sides of the stop plate 24, thus preventing the stop plate 24 from loosening due to high pressure and causing a loss of sealing performance. Multiple sets of positioning strips 26 are installed on the outer side of the fixed cylinder 22, and multiple sets of positioning grooves 27 corresponding to the positioning strips 26 are opened on the inner wall of the sealing sleeve 23. The positioning strips 26 and positioning grooves 27 ensure that the installation position of the sealing sleeve 23 is accurate, and that the first through hole 221 and the second through hole 231 always correspond after the sealing sleeve 23 is installed.

[0045] For further details, please refer to Figure 7-12 The aforementioned shut-off valve also includes an adjustment component 3 for adjusting the valve disc assembly 2. The adjustment component 3 controls the fluid flow rate by adjusting the opening degree of the valve disc assembly 2. The adjustment component 3 is fixedly connected to the valve pipe 11 by multiple sets of fasteners 4, facilitating the removal of the adjustment component 3 for maintenance of the entire shut-off valve. The adjustment component 3 includes a fixing plate 301 fixedly connected to the top of the valve pipe 11 by multiple sets of fasteners 4. A second sealing ring 315 is also provided between the fixing plate 301 and the valve pipe 11. The second sealing ring 315 enhances the sealing performance of the adjustment component 3 after installation, preventing leakage.

[0046] A fixed cover 302 is mounted on the top of the fixed plate 301, and the fixed cover 302 is fixed to the top of the fixed plate 301. Two sets of threaded sleeves 303 are rotatably connected to the fixed plate 301 and the fixed cover 302 via bearings, which minimize resistance when the threaded sleeves 303 rotate. The top end of the threaded sleeve 303 protrudes from the surface of the fixed cover 302, and the bottom end of the threaded sleeve 303 penetrates through the fixed plate 301. Limiting rings 304 are fitted at both ends of the threaded sleeve 303, which limit the rotation of the threaded sleeve 303 and prevent it from moving up and down. A threaded rod 305 is threadedly connected to the threaded sleeve 303, which moves along its length when the threaded sleeve 303 rotates. The bottom end of the threaded rod 305 is fixedly connected to the top of the mounting plate 21, so that when the threaded rod 305 moves up and down, it can drive the mounting plate 21 to move up and down synchronously, that is, drive the valve disc assembly 2 to move up and down as a whole. The other end of the threaded rod 305 is fixedly connected to a limiting frame 306. When the threaded rod 305 moves, it drives the limiting frame 306 to move as well. The limiting frame 306 is U-shaped, and two sets of limiting holes 307 are provided at the bottom of the limiting frame 306. A limiting rod 308 is slidably connected in the limiting holes 307. The bottom end of the limiting rod 308 is fixedly connected to the fixed plate 301. The limiting rod 308 is used to limit the up and down movement of the limiting frame 306, so that the limiting frame 306 moves smoothly, and thus the threaded rod 305 moves smoothly as well. A connecting rod 309 with an L-shaped structure is fixedly connected to the top of the limiting rod 308. The four sets of connecting rods 309 are fixedly connected to a fixed frame 310. The fixed frame 310 is fixedly installed on the top of the fixed plate 301. The fixed frame 310 is fixed in position, so the positions of the multiple sets of connecting rods 309 are fixed, thus fixing the position of the limiting rod 308. A rotating rod 311 is rotatably connected to the fixed frame 310, and the rotating rod 311 rotates while remaining in its original position. A handwheel 312 is installed on the top of the rotating rod 311, which facilitates the rotation of the rotating rod 311. A first gear 313 is also fixedly connected to the end of the rotating rod 311 away from the handwheel 312, and the first gear 313 rotates synchronously with the rotating rod 311. A second gear 314 is fitted onto the outer ring of each of the two sets of threaded sleeves 303, and the second gear 314 rotates synchronously with the threaded sleeves 303. The first gear 313 meshes with the second gear 314, so that when the first gear 313 rotates, it drives the two sets of second gears 314 to rotate synchronously, thereby driving the valve disc assembly 2 to move as a whole. The gear ratio of the first gear 313 to the second gear 314 is 1:2, so that when the first gear 313 rotates two revolutions, it can drive the second gear 314 to rotate one revolution. Therefore, a smaller force is needed to rotate the first gear 313 to drive the second gear 314 to rotate, which is more labor-saving.

[0047] In this embodiment, firstly, the stop plate 24 is rotated to remove it from the fixed cylinder 22. The sealing sleeve 23 is then slidably installed onto the outer ring of the fixed cylinder 22, so that the first through hole 221 corresponds to the second through hole 231. At this time, the positioning strip 26 is positioned in the positioning groove 27 for limiting. The valve disc assembly 2 is placed into the valve tube 11, and the valve tube 11 is fixedly connected to the fixed plate 301 using fasteners 4. At this time, the second sealing ring 315 ensures good sealing between them. The handwheel 312 is rotated, and the rotating rod 311 fixedly connected to the handwheel 312 begins to rotate, thereby causing the first gear 313 fixedly connected to the bottom end of the rotating rod 311 to begin to rotate. The first gear 313 meshes with two sets of second gears 314, driving the two sets of second gears 314 to rotate synchronously and in the same direction. At this time, the two sets of threaded sleeves 303 rotate synchronously under the action of the second gears 314, and the threaded sleeves 303 maintain their original position under the action of the bearings and the limiting rings 304. Since the threaded sleeve 303 is threadedly connected to the threaded rod 305, and one end of the threaded rod 305 is fixedly connected to the mounting plate 21 while the other end is fixedly connected to the limiting frame 306, the rotation of the threaded sleeve 303 can drive the threaded rod 305 to move downwards, causing the limiting frame 306 and the mounting plate 21 to move downwards simultaneously. At this time, the limiting frame 306 moves smoothly under the limiting action of the limiting rod 308, which can prevent the threaded rod 305 from deflecting during the movement. It stops when the handwheel 312 can no longer be rotated. At this time, the first sealing ring 25 installed on the stop plate 24 is tightly attached to the bottom opening of the valve pipe 11, and the valve disc assembly 2 is in the closed state.

[0048] At this point, the valve body 1 is fixed between the two sets of pipes using two flanges 15, and liquid hydrogen is introduced. Liquid hydrogen flows in through the inlet pipe 12, and simultaneously passes through the connecting pipe 14, then sequentially through the second through hole 231 and the first through hole 221 into the fixed cylinder 22. Liquid hydrogen is present on both sides of the stop plate 24, preventing high-pressure liquid hydrogen from pushing upwards and damaging the structure, thus making the structure more stable. When it is necessary to open the valve disc assembly 2, the handwheel 312 is turned, causing the threaded sleeve 303 to rotate and drive the two sets of threaded rods 305 to move upwards, thereby moving the mounting plate 21, which is fixedly connected to the threaded rods 305, upwards. At this point, the sealing sleeve 23 remains tightly pressed against the inner wall of the valve pipe 11, ensuring good sealing. After the stop plate 24 leaves the bottom of the valve pipe 11, the liquid hydrogen entering through the inlet pipe 12 can be discharged through the outlet pipe 13.

[0049] The above specific embodiments are merely optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A high-pressure shut-off valve for a liquid hydrogen system, characterized in that, include: Valve body (1), the valve body (1) includes valve pipe (11) and inlet pipe (12) and outlet pipe (13) connected to its two sides; The valve disc assembly (2) installed in the valve body (1) has two states: closed and open. When the valve disc assembly (2) is completely closed, it is tightly sealed to the bottom of the valve pipe (11), which can effectively cut off the flow of fluid. An adjustment component (3) is used to adjust the valve assembly (2). The adjustment component (3) can control the flow rate of fluid by adjusting the opening degree of the valve assembly (2). The adjustment component (3) is fixedly connected to the valve pipe (11) by multiple sets of fasteners (4). The adjustment assembly (3) includes a fixed plate (301) fixedly connected to the top of the valve pipe (11) by multiple sets of fasteners (4). A fixed cover (302) is installed on the top of the fixed plate (301). The fixed plate (301) and the fixed cover (302) are rotatably connected by a bearing to multiple sets of threaded sleeves (303). The top end of the threaded sleeve (303) protrudes from the surface of the fixed cover (302), and the bottom end of the threaded sleeve (303) penetrates the fixed plate (301). Limiting rings (304) are fitted on both ends of the threaded sleeve (303). The threaded sleeve (303) is threadedly connected to a threaded rod (305). The bottom end of the threaded rod (305) is fixedly connected to the top of the mounting plate (21). The other end of the threaded rod (305) is fixedly connected to a limiting frame (306). The limiting frame (306) is U-shaped. Multiple limiting holes (307) are opened at the bottom of the limiting frame (306). A limiting rod (308) is slidably connected in the limiting hole (307). The bottom end of the limiting rod (308) is fixedly connected to the fixed plate (301).

2. The high-pressure shut-off valve for a liquid hydrogen system according to claim 1, characterized in that, The valve body (1) also includes a connecting pipe (14) connecting the valve pipe (11) and the inlet pipe (12). The inlet pipe (12) and the outlet pipe (13) are both equipped with flanges (15) at the ends away from the valve pipe (11). Multiple sets of connection holes (16) are provided on the flanges (15).

3. A high-pressure shut-off valve for a liquid hydrogen system according to claim 2, characterized in that, The valve assembly (2) includes a mounting plate (21) disposed in the valve tube (11). A fixing cylinder (22) is installed at the bottom of the mounting plate (21). A sealing sleeve (23) is fitted around the outer ring of the fixing cylinder (22). A stop plate (24) is also disposed below the sealing sleeve (23). The stop plate (24) is threadedly connected to the fixing cylinder (22). A first sealing ring (25) is installed on the stop plate (24).

4. A high-pressure shut-off valve for a liquid hydrogen system according to claim 3, characterized in that, The outer side of the fixed cylinder (22) is equipped with multiple sets of positioning strips (26), and the inner wall of the sealing sleeve (23) is provided with multiple sets of positioning grooves (27) corresponding to the positioning strips (26). The outer diameter of the stop plate (24) is larger than the outer diameter of the positioning grooves (27).

5. A high-pressure shut-off valve for a liquid hydrogen system according to claim 3, characterized in that, The side of the fixed cylinder (22) is provided with a first through hole (221) corresponding to the connecting pipe (14), and the side of the sealing sleeve (23) is provided with a second through hole (231) corresponding to the connecting pipe (14).

6. A high-pressure shut-off valve for a liquid hydrogen system according to claim 3, characterized in that, The top end of the limiting rod (308) is fixedly connected to a connecting rod (309), and multiple sets of the connecting rods (309) are fixedly connected to a fixing frame (310). The fixing frame (310) is fixedly installed on the top of the fixing plate (301). A rotating rod (311) is rotatably connected in the fixing frame (310), and a handwheel (312) is installed on the top of the rotating rod (311).

7. A high-pressure shut-off valve for a liquid hydrogen system according to claim 6, characterized in that, The end of the rotating rod (311) away from the handwheel (312) is also fixedly connected to a first gear (313), and the outer rings of the two sets of threaded sleeves (303) are fitted with second gears (314), and the first gear (313) meshes with the second gear (314).

8. A high-pressure shut-off valve for a liquid hydrogen system according to claim 3, characterized in that, A second sealing ring (315) is also provided between the fixed plate (301) and the valve pipe (11).

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