Liquid hydrogen stop valve

Abstract

The utility model relates to the technical field of stop valves, and provides a liquid hydrogen stop valve which comprises a valve body, a valve clack and a valve cover, and the valve cover is arranged above the valve body and fixedly connected with the valve body through a guide rod. The guide block is arranged on the guide rod and is in sliding connection with the guide rod; the valve rod penetrates through the valve cover and the guide rod in the longitudinal direction, the bottom of the valve rod is fixedly connected with the valve clack, and the top of the valve rod is fixedly connected with the guide block; the operating rod penetrates through the valve cover in the longitudinal direction and is in threaded connection with the valve cover, and the bottom of the operating rod is rotationally connected with the guide block; the corrugated pipe is arranged on the valve rod in a sleeving manner, and the lower end of the corrugated pipe is fixedly connected with the valve rod; the heat insulation ring is arranged at the lower end of the valve rod in a sleeving mode, fixedly connected with the valve body and located below the corrugated pipe; the sealing assembly is arranged above the corrugated pipe and used for achieving sealing between the valve rod and the valve body.

Description

A liquid hydrogen shut-off valve Technical Field

[0001] This utility model relates to the field of shut-off valve technology, specifically to a liquid hydrogen shut-off valve. Background Technology

[0002] With the rapid development of my country's hydrogen energy industry, the demand for hydrogen energy is experiencing explosive growth. Current high-pressure gaseous hydrogen storage and transportation methods will be insufficient to meet the future application requirements of low cost and high convenience of hydrogen energy, thus opening up new possibilities for liquid hydrogen applications. Compared to existing high-pressure gaseous hydrogen, liquid hydrogen has advantages such as low pressure, high energy density, and convenient storage and transportation. Unlike LNG, liquid hydrogen has a temperature of only around 20K, making it highly susceptible to heat absorption and vaporization, and also prone to explosion. Therefore, to ensure the safety of liquid hydrogen storage and transportation, a sealed, safe, and reliable cryogenic liquid hydrogen valve is particularly important.

[0003] Chinese utility model patent CN222142434U discloses a cryogenic shut-off valve for liquid hydrogen, which minimizes heat exchange between the valve's outer wall and the air, significantly reducing heat loss and shortening cooling time, enabling stable, cryogenic delivery of liquid hydrogen. However, on the one hand, this shut-off valve has a very complex structure, increasing manufacturing costs for companies; on the other hand, the valve stem rotates during use, which can easily cause the bellows to twist and deform, affecting the safety and reliability of liquid hydrogen delivery. Summary of the Invention

[0004] In view of the deficiencies in the existing technology, the purpose of this utility model is to provide a liquid hydrogen shut-off valve with a simple structure that can safely and reliably transport liquid hydrogen.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a liquid hydrogen shut-off valve, comprising a valve body and a valve disc, and further comprising...

[0006] A valve cover is disposed above the valve body and is fixedly connected to the valve body via a guide rod;

[0007] A guide block, which is disposed on the guide rod and slidably connected to the guide rod;

[0008] A valve stem, which passes longitudinally through the valve cover and the guide rod, with its bottom fixedly connected to the valve disc and its top fixedly connected to the guide block;

[0009] An operating lever, which passes longitudinally through the valve cover and is threadedly connected to the valve cover, with its bottom rotatably connected to the guide block;

[0010] A bellows, which is sleeved on the valve stem, with its lower end fixedly connected to the valve stem;

[0011] A heat insulation ring is sleeved on the lower end of the valve stem and fixedly connected to the valve body. The heat insulation ring is located below the bellows.

[0012] A sealing assembly is disposed above the bellows and is used to achieve a seal between the valve stem and the valve body.

[0013] Furthermore, the sealing assembly includes a packing seat, packing, a packing pressure plate, a threaded rod, and a nut;

[0014] The packing seat is sleeved on the valve stem and fixedly connected to the valve body. An annular groove is formed on the top of the packing seat. The packing is laid in the annular groove and contacts the valve stem. The packing pressure plate is used to press the packing downward. The threaded rod passes through the packing pressure plate longitudinally and is fixedly connected to the valve body. The nut is sleeved on the threaded rod and threadedly connected to the threaded rod. The nut contacts the top of the packing pressure plate.

[0015] Furthermore, the bottom of the packing plate is formed with an annular protrusion that extends into and is adapted to the annular groove.

[0016] Furthermore, the valve disc and the valve body are connected by a line seal.

[0017] Furthermore, a handwheel is fixedly mounted on the top of the operating lever.

[0018] The beneficial effects of this utility model are as follows: The liquid hydrogen shut-off valve provided by this utility model simplifies the structure of existing liquid hydrogen shut-off valves from a practical point of view, using fewer parts and having a simple overall structure. On the other hand, through the design of the guide rod, valve cover, operating rod and guide block, the valve rod will only move up and down during operation, without rotating, avoiding the twisting and torsional deformation of the bellows, thus enabling safe and reliable delivery of liquid hydrogen. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the internal cross-sectional structure of this utility model.

[0020] Reference numerals: 10-valve body, 11-liquid hydrogen passage, 20-valve disc, 30-valve cover, 31-guide rod, 40-guide block, 50-valve stem, 60-operating lever, 61-handwheel, 70-insulation ring, 80-bellows, 90-sealing assembly, 91-packing seat, 92-packing, 93-packing pressure plate, 94-threaded rod, 95-nut, 96-annular protrusion. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0025] As shown in Figure 1, this utility model provides a liquid hydrogen shut-off valve, including a valve body 10 and a valve disc 20. The valve body 10 has a liquid hydrogen channel 11. The valve disc 20 can control the opening and closing of the liquid hydrogen channel 11 when it rises and falls. The above are all prior art, and the specific structure will not be described in detail here. This utility model also includes a valve cover 30, a guide block 40, a valve stem 50, an operating rod 60, a heat insulation ring 70, a bellows 80, and a sealing assembly 90.

[0026] The valve cover 30 is positioned above the valve body 10 and is fixedly connected to the valve body 10 via a guide rod 31.

[0027] The guide block 40 is mounted on the guide rod 31 and is slidably connected to the guide rod 31.

[0028] The valve stem 50 passes longitudinally through the valve cover 30 and the guide rod 31. The bottom of the valve stem 50 is fixedly connected to the valve disc 20, and the top of the valve stem 50 is fixedly connected to the guide block 40.

[0029] The operating lever 60 passes longitudinally through the valve cover 30 and is threadedly connected to the valve cover 30. The bottom of the operating lever 60 is rotatably connected to the guide block 40. Preferably, the axis of the operating lever 60 is collinear with the axis of the valve stem 50.

[0030] The bellows 80 is sleeved on the valve stem 50, and the lower end of the bellows 80 is fixedly connected to the valve stem 50. The bellows 80 serves a sealing function to prevent leakage from the radial gap between the valve stem 50 and the valve body 10.

[0031] A heat insulation ring 70 is fitted onto the lower end of the valve stem 50 and fixedly connected to the valve body 10. The heat insulation ring 70 is located below the bellows 80. The heat insulation ring 70 is positioned between the valve stem 50 and the valve body 10, and is located below the bellows 80. The heat insulation ring 70 reduces the radial clearance between the valve stem 50 and the valve body 10, reduces the heat convection of liquid hydrogen within the valve space, and thus limits the low-temperature transfer of liquid hydrogen to the bellows 80, thereby reducing the low-temperature performance requirements of the bellows 80 and improving its sealing life.

[0032] The sealing assembly 90 is positioned above the bellows 80 and is used to achieve a seal between the valve stem 50 and the valve body 10.

[0033] When this utility model is in operation, the operator only needs to control the rotation of the operating rod 60. Since the operating rod 60 is threadedly connected to the valve cover 30, under the action of the guide rod 31, the operating rod 60 will drive the guide block 40 to move up and down. The guide block 40 will then drive the valve rod 50 and the valve disc 20 to move up and down simultaneously, thereby controlling the opening and closing of the liquid hydrogen channel 11.

[0034] From a practical standpoint, this invention simplifies the structure of existing liquid hydrogen shut-off valves, using fewer components and resulting in a simpler overall structure while still maintaining good sealing performance. Furthermore, through the design of the guide rod 31, valve cover 30, operating rod 60, and guide block 40, the operating rod 60 does not cause the guide block 40 and valve stem 50 to rotate during operation; the valve stem 50 only moves up and down. This prevents the bellows 80 from twisting and deforming, thus ensuring safe and reliable liquid hydrogen delivery.

[0035] In one embodiment, the sealing assembly 90 includes a packing seat 91, a packing 92, a packing pressure plate 93, a threaded rod 94, and a nut 95.

[0036] A packing seat 91 is fitted onto the valve stem 50 and fixedly connected to the valve body 10. A downwardly extending annular groove is formed at the top of the packing seat 91. Packing 92 is laid within the annular groove and contacts the valve stem 50. A packing pressure plate 93 is positioned above the packing 92 and is used to press the packing 92 downwards. A threaded rod 94 passes longitudinally through the packing pressure plate 93 and is fixedly connected to the valve body 10. A nut 95 is fitted onto the threaded rod 94 and threadedly connected to it. The nut 95 contacts the top of the packing pressure plate 93.

[0037] When the operator tightens nut 95, nut 95 moves the packing plate 93 downwards, causing the packing 92 to be tightly filled into the annular groove, achieving a good seal between the valve stem 50 and the valve body 10. Unscrewing nut 95 and opening the packing plate 93 allows for replacement of the sealing packing 92, a convenient design for maintenance. The sealing packing 92, in conjunction with the bellows 80, provides a double seal, ensuring zero leakage between the valve stem 50 and the valve body 10, further improving the sealing performance.

[0038] In one embodiment, the bottom of the packing plate 93 is formed with an annular protrusion 96, which extends into and is adapted to the annular groove.

[0039] The annular protrusion 96 is adapted to the annular groove, allowing them to fit together better and enabling the packing 92 to fill the annular groove more tightly, thus achieving a good seal between the valve stem 50 and the valve body 10.

[0040] In one embodiment, the valve disc 20 and the valve body 10 are connected by a line seal to prevent scratches on the sealing surfaces of the valve disc 20 and the valve body 10 at low temperatures.

[0041] In one embodiment, a handwheel 61 is fixedly mounted on the top of the operating lever 60 to facilitate the operator in controlling the rotation of the operating lever 60.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0043] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A liquid hydrogen shut-off valve, comprising a valve body and a valve disc, characterized in that: The valve also includes a valve cover, which is disposed above the valve body and fixedly connected to the valve body via a guide rod; a guide block, which is disposed on the guide rod and slidably connected to the guide rod; a valve stem, which passes longitudinally through the valve cover and the guide rod, with its bottom fixedly connected to the valve disc and its top fixedly connected to the guide block; an operating rod, which passes longitudinally through the valve cover and is threadedly connected to the valve cover, with its bottom rotatably connected to the guide block; a bellows, which is sleeved on the valve stem and whose lower end is fixedly connected to the valve stem; a heat insulation ring, which is sleeved on the lower end of the valve stem and fixedly connected to the valve body, and is located below the bellows; and a sealing assembly, which is disposed above the bellows and used to achieve a seal between the valve stem and the valve body.

2. The liquid hydrogen shut-off valve according to claim 1, characterized in that: The sealing assembly includes a packing seat, packing, a packing pressure plate, a threaded rod, and a nut. The packing seat is sleeved on the valve stem and fixedly connected to the valve body. An annular groove is formed on the top of the packing seat. The packing is laid in the annular groove and contacts the valve stem. The packing pressure plate is used to press the packing downward. The threaded rod passes through the packing pressure plate longitudinally and is fixedly connected to the valve body. The nut is sleeved on the threaded rod and threadedly connected to the threaded rod. The nut contacts the top of the packing pressure plate.

3. A liquid hydrogen shut-off valve according to claim 2, characterized in that: The bottom of the packing plate has an annular protrusion that extends into and is adapted to the annular groove.

4. A liquid hydrogen shut-off valve according to claim 1, characterized in that: The valve disc and the valve body are sealed by a line.

5. A liquid hydrogen shut-off valve according to claim 1, characterized in that: A handwheel is fixedly installed on the top of the operating lever.

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