A cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments

Abstract

The application discloses a low-temperature valve for a low-temperature liquid nitrogen and liquid oxygen environment, a valve core is integrally formed at the bottom end of the valve rod, a driving rod is welded at the bottom end of the valve core, the lower end of the valve body is contracted to form a liquid outlet pipe, a one-way piece is installed in the liquid outlet pipe, a liquid inlet pipe is welded at the right end of the outer ring of the valve body, an emptying pipe is welded at the left end of the outer ring of the liquid outlet pipe, an emptying structure is installed in the emptying pipe, and the emptying structure and the one-way piece are connected with the driving rod. By installing the one-way piece in the liquid outlet pipe of the valve body, the low-position valve has the functions of a stop valve and a one-way valve, a driving rod is arranged below the valve core, a limiting structure for limiting the one-way core is arranged in the one-way piece, the limiting structure is connected with the driving rod through a lower pressing rod, so that when the valve core is stopped to stop the flow of liquid nitrogen and liquid oxygen, the one-way piece will be synchronously closed, the two ends cannot flow, and the generated bubbles cannot enter the equipment.

Description

Technical Field

[0001] This invention relates to the field of valves, and more particularly to a cryogenic valve for use in cryogenic liquid nitrogen and liquid oxygen environments. Background Technology

[0002] In the transportation of liquid nitrogen and liquid oxygen, cryogenic valves are typically used due to the low temperatures. To prevent backflow during liquid transportation, a check valve is usually installed at the outlet of the cryogenic valve to ensure that the liquid does not flow back. Because there is still a distance between the outlet of the check valve and the outlet of the cryogenic valve, when the cryogenic valve is closed, the liquid at the outlet of the cryogenic valve cannot be discharged due to insufficient pressure. This results in a certain amount of cryogenic liquid remaining between the outlet of the cryogenic valve and the inlet of the check valve. The boiling points of the retained liquid nitrogen and liquid oxygen are much lower than room temperature. When the cryogenic liquid is left in a non-fully insulated environment for a long time, it may rapidly absorb heat and reach its boiling point. The internal liquid will violently vaporize and form bubbles. When liquid nitrogen vaporizes, its volume expands by about 700 times. The rapid phase change process will intensify the bubble formation rate and intensity, thereby increasing the pressure in this space. In severe cases, the increased gas pressure may cause an explosion. In mild cases, the increased gas pressure may force open the valve core of the check valve, allowing these gases to enter the equipment and mix with the liquid nitrogen and liquid oxygen. Excessive bubbles will cause liquid entrainment, which may block the tray channels or gas phase channels, and in severe cases, induce a flooding accident. To address this, a cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments has been designed. Summary of the Invention

[0003] The present invention proposes a cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments, which solves the above-mentioned problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments includes a long-necked valve cover. A pneumatic actuator is bolted to the top of the long-necked valve cover, and a valve body is bolted to the bottom of the long-necked valve cover. A valve stem is slidably mounted inside the long-necked valve cover. The top of the valve stem is connected to the pneumatic shaft of the pneumatic actuator. The pneumatic actuator is an AT pneumatic actuator with its own pneumatic shaft. A valve core is integrally formed at the bottom of the valve stem and extends into the valve body. A drive rod is welded to the bottom of the valve core.

[0006] The lower end of the valve body narrows to form an outlet pipe. A one-way component is installed in the outlet pipe. An inlet pipe is welded to the right end of the outer ring of the valve body. An outlet pipe is welded to the left end of the outer ring of the outlet pipe. An outlet structure is installed inside the outlet pipe. The outlet structure and the one-way component are both connected to the drive rod.

[0007] The one-way component includes a fixed tube fixed to the bottom of the inside of the liquid outlet tube. The upper and lower ends of the fixed tube are respectively welded with annular frames. A guide sleeve is welded between the upper and lower annular frames. A one-way core is slidably sleeved on the guide sleeve. A lifting spring is sleeved on the guide sleeve. The upper and lower ends of the lifting spring abut against the bottom end of the one-way core and the upper surface of the lower annular frame, respectively. The lifting spring makes the one-way core always have an upward tendency. A limiting component for limiting the one-way core is installed inside the guide sleeve. A pressing rod is fixed below the drive rod and is connected to the limiting component.

[0008] The upper part of the fixed tube is thickened to form a conical surface. The conical surface and the outer ring surface of the unidirectional core are both conical in cross section. When the unidirectional core moves upward, the outer ring surface of the unidirectional core can be tightly pressed with the conical surface. The two adopt a compression sealing structure, which will not cause deformation or leakage due to low temperature.

[0009] The upper half of the inner ring of the unidirectional core is designed with a conical structure to form a sealing surface. The outer ring surface of the guide sleeve is designed with a protruding and thickened shape to form a sealing joint surface. The sealing surface and the sealing joint surface have a conical cross-section. After the unidirectional core moves upward, the sealing surface can be tightly pressed with the sealing joint surface to form a sealing structure.

[0010] The outer ring of the guide sleeve has four sets of annular arrayed through holes. The limiting member includes multiple limiting blocks, which are slidably inserted into the through holes. A guide block is fixed at the bottom of the limiting block. A support ring is fixed in the inner ring of the guide sleeve. The support ring has guide grooves distributed around its four sides through its upper and lower parts. The guide block is slidably inserted into the guide groove.

[0011] The lower half of the inner ring surface of the unidirectional core is designed with a conical structure to form a contact surface, and the outer side of the limiting block is designed with an arc-shaped structure to form a limiting slope. When multiple limiting blocks move away from each other and outward, the limiting slope can contact the contact surface and push the unidirectional core to move upward to form a sealing structure.

[0012] The inner side of the limiting block has an arc-shaped structure designed to form a downward pressure slope, and the bottom end of the pressing rod has an arc-shaped surface. When the pressing rod moves downward, the arc-shaped surface at the bottom end of the pressing rod can contact the downward pressure slope, thereby pushing the four limiting blocks to move outward synchronously. The outward-moving limiting blocks will contact the one-way core and restrict its downward movement, thus ensuring that the gas in the space between the valve core and the one-way core cannot overflow into the equipment.

[0013] Preferably, a retaining ring is welded to the outer ring of the valve stem, and a bellows is sleeved on the outer ring of the valve stem. The top end of the bellows is welded to the retaining ring, and a flange is provided at the bottom end of the bellows. The flange is pressed between the bottom end of the long neck valve cover and the top end of the valve body. The three are fixed together by bolts and nuts. The bellows is a metal bellows, and its top end is welded to the retaining ring without any gap between them. Its bottom end seals the bottom end of the long neck valve cover and the top end of the valve body. Compared with traditional sealing elements, using the bellows as a sealing element allows the valve stem to move up and down normally, and also avoids deformation of the sealing element in low-temperature environments, thus improving the sealing effect.

[0014] The lower end of the valve stem is fitted with a guide member, which is fixed inside the upper part of the valve body. The outer ring of the top of the guide member is integrally formed with a ring. The top of the valve body has an annular groove, and the ring is placed in the annular groove. The top of the ring is tightly pressed against the lower end of the flange of the bellows.

[0015] Preferably, a second bellows is fitted around the outer ring of the pressure rod. The bottom end of the second bellows is welded to the outer ring of the pressure rod, and the top end of the second bellows is welded to the top end of the guide sleeve. There is no gap between the two, which improves the sealing effect between the pressure rod and the guide sleeve, preventing liquid nitrogen and liquid oxygen above the guide sleeve from penetrating into the lower part of the guide sleeve.

[0016] Preferably, the venting structure includes a guide ring seat fixed inside the venting pipe, a guide post slidably inserted into the guide ring seat, a sealing head integrally formed at the left end of the guide post, and an opening and closing part and a pressing part welded to the upper and lower sides of the right end of the guide post, respectively. The opening and closing part and the pressing part are slidably connected to the drive rod. The cross-section of the venting pipe is convex, and the sealing head structure is the same as the cross-section of the venting pipe. When the sealing head moves to the left, it can abut against the inner wall of the venting pipe to form a sealing structure. When it moves to the right, a gap will be left, thus allowing the gas to be discharged.

[0017] Preferably, the upper half of the left side of the opening and closing part is designed to form an opening and closing slope, and the lower half of the opening and closing part is vertically downward to form a vertical surface. An L-shaped block is welded to the left side of the outer ring of the drive rod. The lower end of the L-shaped block is cut off to form an inclined opening surface. The drive rod moves downward together with the valve core. When the valve core is fully closed, the opening and closing slope will contact the opening surface and push the L-shaped block to move to the right, thereby causing the entire guide column and sealing head to move to the right, and a gap is formed between the sealing head and the inner wall of the drain pipe.

[0018] Preferably, the right side surface of the pressing part is cut off to form a pressing slope, and an abutment block is welded to the left side of the outer ring of the drive rod. The right side surface of the opening and closing part is coplanar with the right side surface of the guide post. When the drive rod moves upward, the abutment block will move upward along the pressing slope, and during the upward movement, it will push the guide post to move to the left, thereby causing the sealing head to seal the drain pipe. When the abutment block contacts the right side surface of the guide post, the sealing head is in a sealed state. When the abutment block continues to move upward, it contacts the right side surface of the opening and closing part and will not push the sealing head, thus avoiding damage caused by excessive pressure.

[0019] The beneficial effects of this invention are:

[0020] 1. By installing a one-way valve in the outlet pipe of the valve body, the cryogenic valve can simultaneously function as a shut-off valve and a one-way valve. A drive rod is set below the valve core, and the one-way valve is equipped with a limiting structure for limiting the one-way valve core. The limiting structure is connected to the drive rod through a pressure rod. This means that when the valve core shuts off and the liquid nitrogen and liquid oxygen stop flowing, the one-way valve will also close synchronously, and neither end of it can flow, thus preventing the generated air bubbles from entering the equipment.

[0021] 2. By installing a drain pipe on the liquid outlet pipe and a drain structure inside the drain pipe, the drain structure is connected to the valve core through a drive rod. When the valve core is closed, causing the liquid nitrogen and liquid oxygen to stop flowing, the drain structure will also be forced to open synchronously. This makes the space between the one-way component and the valve core open, allowing the gas generated inside to be discharged, thus improving safety.

[0022] 3. The venting structure and the one-way component are linked by a drive rod and a pressure rod. When the venting structure is open, the one-way component is in a closed state, and when the one-way component is open, the venting structure must be in a closed state. This ensures that when the cryogenic valve is normally supplying liquid nitrogen and liquid oxygen, the liquid nitrogen and liquid oxygen inside will not leak, thus improving safety. Attached Figure Description

[0023] Figure 1 This is a front cross-sectional schematic diagram of a cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments proposed in this invention.

[0024] Figure 2 This is a cross-sectional view of a cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments proposed in this invention.

[0025] Figure 3 This is a partial cross-sectional schematic diagram of a cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments proposed in this invention.

[0026] Figure 4 for Figure 3 Enlarged view of a portion of the image;

[0027] Figure 5for Figure 2 Enlarged view of a portion of the image;

[0028] Figure 6 for Figure 5 Schematic diagram of the structure of the unidirectional component;

[0029] Figure 7 for Figure 6 Exploded view of a unidirectional component;

[0030] Figure 8 for Figure 5 A schematic diagram of the central venting structure and the valve core.

[0031] The diagram labels are as follows: 1. Pneumatic actuator; 2. Long neck valve cover; 3. Valve body; 31. Discharge pipe; 32. Inlet pipe; 33. Drain pipe; 4. Valve stem; 401. Retaining ring; 402. Guide component; 41. Bellows I; 42. Valve core; 43. Drive rod; 431. L-shaped block; 432. Opening surface; 433. Abutment block; 5. One-way component; 51. Retaining pipe; 511. Conical surface; 52. Annular frame; 53. Guide sleeve; 531. Sealing surface; 532. 54. Lifting spring; 55. One-way core; 551. Abutment surface; 552. Sealing surface; 56. Pressing rod; 561. Bellows II; 57. Limiting block; 571. Guide block; 572. Limiting inclined surface; 573. Pressing inclined surface; 58. Support ring; 581. Guide groove; 6. Drainage structure; 61. Guide ring seat; 62. Sealing head; 63. Guide column; 64. Opening and closing part; 641. Opening and closing inclined surface; 65. Pressing part; 651. Pressing inclined surface. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] Reference Figures 1-8 A cryogenic valve for cryogenic liquid nitrogen and liquid oxygen environments includes a long-necked valve cover 2, a pneumatic actuator 1 bolted to the top of the long-necked valve cover 2, a valve body 3 bolted to the bottom of the long-necked valve cover 2, a valve stem 4 slidably mounted inside the long-necked valve cover 2, the top of the valve stem 4 being connected to the pneumatic shaft of the pneumatic actuator 1, the pneumatic actuator 1 being an AT pneumatic actuator with its own pneumatic shaft, a valve core 42 integrally formed at the bottom of the valve stem 4, the valve core 42 extending into the valve body 3, and a drive rod 43 welded to the bottom of the valve core 42;

[0034] The lower end of the valve body 3 is narrowed to form an outlet pipe 31. A one-way component 5 is installed in the outlet pipe 31. An inlet pipe 32 is welded to the right end of the outer ring of the valve body 3. An outlet pipe 33 is welded to the left end of the outer ring of the outlet pipe 31. An outlet structure 6 is installed in the outlet pipe 33. The outlet structure 6 and the one-way component 5 are both connected to the drive rod 43.

[0035] The one-way component 5 includes a fixed tube 51 fixed inside the bottom end of the outlet tube 31. The upper and lower ends of the fixed tube 51 are respectively welded with annular frames 52. A guide sleeve 53 is welded between the upper and lower annular frames 52. The guide sleeve 53 is slidably sleeved with a one-way core 55. A lifting spring 54 is sleeved on the guide sleeve 53. The upper and lower ends of the lifting spring 54 abut against the bottom end of the one-way core 55 and the upper surface of the lower annular frame 52, respectively. The lifting spring 54 makes the one-way core 55 always have an upward tendency. A limiting component for limiting the one-way core 55 is installed inside the guide sleeve 53. A pressing rod 56 is fixed below the drive rod 43. The pressing rod 56 is connected to the limiting component.

[0036] The upper part of the fixed tube 51 is thickened to form a conical surface 511. The conical surface 511 and the outer ring surface of the one-way core 55 are both conical. When the one-way core 55 moves upward, the outer ring surface of the one-way core 55 can be tightly pressed with the conical surface 511. The two adopt a compression sealing structure, which will not cause deformation or leakage due to low temperature.

[0037] The upper half of the inner ring of the one-way core 55 is designed with a conical structure to form a sealing surface 552. The outer ring surface of the guide sleeve 53 is designed with a protruding and thickened structure to form a sealing contact surface 531. The sealing surface 552 and the sealing contact surface 531 have a conical cross-section. After the one-way core 55 moves upward, the sealing surface 552 can be tightly pressed with the sealing contact surface 531 to form a sealing structure.

[0038] The outer ring of the guide sleeve 53 has four sets of annular arrayed through holes 532. The limiting component includes multiple limiting blocks 57, which are slidably inserted into the through holes 532. The bottom end of the limiting block 57 is fixed with a guide block 571. The inner ring of the guide sleeve 53 is fixed with a support ring 58. The support ring 58 passes through the top and bottom to form a guide groove 581 with annular distribution around it. The guide block 571 is slidably inserted into the guide groove 581.

[0039] The lower half of the inner ring surface of the unidirectional core 55 is designed with a conical structure to form an abutment surface 551. The arc-shaped structure on the outward side of the limiting block 57 forms a limiting slope 572. When multiple limiting blocks 57 move away from each other and outward, the limiting slope 572 can contact the abutment surface 551 and push the unidirectional core 55 to move upward to form a sealing structure.

[0040] The inner side of the limiting block 57 has an arc-shaped structure design to form a downward pressure slope 573, and the bottom end of the pressing rod 56 has an arc-shaped surface design to form an arc surface. When the pressing rod 56 moves downward, the arc surface at the bottom end of the pressing rod 56 can contact the downward pressure slope 573, thereby pushing the four limiting blocks 57 to move outward synchronously. The outward-moving limiting blocks 57 will contact the one-way core 55 and restrict its downward movement, thereby ensuring that the gas in the space between the valve core 42 and the one-way core 55 cannot overflow into the equipment.

[0041] Reference Figure 2 , Figure 3 A retaining ring 401 is welded to the outer ring of the valve stem 4. A bellows 41 is sleeved on the outer ring of the valve stem 4. The top end of the bellows 41 is welded to the retaining ring 401. A flange is provided at the bottom end of the bellows 41. The flange is pressed between the bottom end of the long neck valve cover 2 and the top end of the valve body 3. The three are fixed together by bolts and nuts. The bellows 41 is a metal bellows. Its top end is welded to the retaining ring 401. There is no gap between the two. Its bottom end is sealed with the bottom end of the long neck valve cover 2 and the top end of the valve body 3. Compared with traditional sealing elements, the use of bellows 41 as a sealing element allows the valve stem 4 to move up and down normally. At the same time, it avoids the deformation of the sealing element in low temperature environment and improves the sealing effect.

[0042] The lower end of the valve stem 4 is fitted with a guide 402, which is fixed inside the upper part of the valve body 3. The top outer ring of the guide 402 is integrally formed with a ring. The top of the valve body 3 has an annular groove, and the ring is placed in the annular groove. The top of the ring is tightly pressed against the lower end of the flange of the bellows 41.

[0043] Reference Figures 6-8 The outer ring of the pressure rod 56 is fitted with a second bellows 561. The bottom end of the second bellows 561 is welded to the outer ring of the pressure rod 56, and the top end of the second bellows 561 is welded to the top end of the guide sleeve 53. There is no gap between the two, which improves the sealing effect between the pressure rod 56 and the guide sleeve 53, so that liquid nitrogen and liquid oxygen above the guide sleeve 53 cannot penetrate into the lower part of the guide sleeve 53.

[0044] Reference Figures 4-8 The venting structure 6 includes a guide ring seat 61 fixed inside the venting pipe 33. A guide post 63 is slidably inserted into the guide ring seat 61. A sealing head 62 is integrally formed on the left end of the guide post 63. An opening and closing part 64 and a pressing part 65 are welded to the upper and lower sides of the right end of the guide post 63, respectively. Both the opening and closing part 64 and the pressing part 65 are slidably connected to the drive rod 43. The cross-section of the venting pipe 33 is convex. The structure of the sealing head 62 is the same as the cross-section of the venting pipe 33. When the sealing head 62 moves to the left, it can abut against the inner wall of the venting pipe 33 to form a sealing structure. When it moves to the right, a gap will be left, thus allowing the gas to be discharged.

[0045] The upper left half of the opening and closing part 64 is designed with an inclined surface to form an opening and closing inclined surface 641. The lower half of the opening and closing part 64 is vertically downward to form a vertical surface. An L-shaped block 431 is welded to the left side of the outer ring of the drive rod 43. The lower end of the L-shaped block 431 is cut off to form an inclined opening surface 432. The drive rod 43 moves downward together with the valve core 42. When the valve core 42 is about to be fully closed, the opening and closing inclined surface 641 will contact the opening surface 432. Then the valve core 42 continues to move downward. At this time, the L-shaped block 431 on the drive rod 43 moves downward together with the valve core 42 and the drive rod 43. The opening surface of the downward moving L-shaped block 431 will squeeze the opening and closing inclined surface 641 on the opening and closing part 64, thereby pushing the opening and closing part 64 to move to the right, and thus causing the entire guide post 63 and the sealing head 62 to move to the right, until the valve core 42 moves to the bottom so that the valve body is fully closed, and a gap is formed between the sealing head 62 and the inner wall of the drain pipe 33.

[0046] The right side surface of the pressing part 65 is cut off to form a pressing slope 651. A stop block 433 is welded to the left side of the outer ring of the drive rod 43. The right side surface of the opening and closing part 64 is coplanar with the right side surface of the guide post 63. When the drive rod 43 moves upward, the stop block 433 will move upward along the pressing slope 651. During the upward movement, it will push the guide post 63 to move to the left, thereby causing the sealing head 62 to seal the drain pipe 33. When the stop block 433 contacts the right side surface of the guide post 63, the sealing head 62 is in a sealed state. When the stop block 433 continues to move upward, it contacts the right side surface of the opening and closing part 64 and will not push the sealing head 62, thus avoiding damage caused by excessive pressure.

[0047] Working principle: In actual use, the liquid outlet pipe 31 is connected to the liquid inlet of the equipment to be used through a pipeline, the liquid inlet pipe 32 is connected to the pipeline for transporting liquid nitrogen and liquid oxygen through a pipeline, and the vent pipe 33 is connected to the vacuum pump through a pipeline. The pneumatic actuator 1 moves the valve stem 4 upward through the pneumatic shaft, thereby opening the valve core 42.

[0048] At the same time, when the valve core 42 moves upward, the pressure rod 56 located below the drive rod 43 will also move upward synchronously. The bottom end of the pressure rod 56 will disengage from the pressure slope 573 on the inner side wall of the multiple limit blocks 57, that is, the pressure rod 56 releases the contact limit of the multiple limit blocks 57, and the limit blocks 57 can then move freely inward.

[0049] During the upward movement of the valve core 42, the drive rod 43, the abutment block 433, and the L-shaped block 431 located below the valve core 42 will also move upward together. When the abutment block 433 moves upward, it will move upward along the pressing slope 651. As the abutment block 433 gradually rises, it will push the guide post 63 to move to the left, thereby causing the sealing head 62 to seal the drain pipe 33. When the abutment block 433 contacts the right side surface of the guide post 63, the sealing head 62 is in a sealed state. When the abutment block 433 continues to move upward, it contacts the right side surface of the opening and closing part 64 and will not push the sealing head 62, thus avoiding damage caused by excessive pressure.

[0050] After the valve core 42 is opened, the valve body 3 is connected to the outlet pipe 31, which in turn connects the outlet pipe 31 to the inlet pipe 32. Liquid nitrogen and liquid oxygen entering the valve body 3 through the inlet pipe 32 can flow into the outlet pipe 31. At this time, the sealing head 62 seals the drain pipe 33, so liquid nitrogen and liquid oxygen will not flow out through the drain pipe 33. Initially, the one-way core 55 blocks the outlet 31 under the action of the lifting spring 54. As the amount of liquid nitrogen and liquid oxygen in the outlet pipe 31 increases, the internal pressure gradually increases. The liquid nitrogen and liquid oxygen will push the one-way core 55 to move downward. During the downward movement of the one-way core 55, the conical surface 551 of the one-way core 55 will squeeze the limiting slope 572 of the limiting block 57, which will cause multiple limiting blocks 57 to extend and retract inward into the guide sleeve 53. The lifting spring 54 is compressed downward, and the liquid nitrogen and liquid oxygen can be discharged through the space between the one-way core 55 and the inner wall of the fixed pipe 51 and flow into the corresponding equipment.

[0051] When liquid nitrogen and liquid oxygen flow back, the lifting spring 54 will cause the one-way core 55 to move upward. As the amount of liquid nitrogen and liquid oxygen increases and the pressure increases, the pressure between the outer ring surface of the one-way core 55 and the conical surface 511, and the pressure between the sealing surface 552 of the one-way core 55 and the sealing interface 531 of the guide sleeve 53 will become greater and greater, thus making the sealing effect better and preventing backflow.

[0052] The pneumatic actuator 1 moves the valve stem 4 downward via the pneumatic shaft, thereby closing the valve core 42. The cryogenic valve can be shut off. When the valve core 42, drive rod 43, and pressure rod 56 move downward, the arc-shaped structure design of the inner side of the limiting block 57 forms a downward pressure slope 573, and the arc-shaped design of the bottom end of the pressure rod 56 forms an arc surface. When the pressure rod 56 moves downward together with the drive rod 43, the arc surface at the bottom end of the pressure rod 56 can contact the downward pressure slope 573, thereby pushing the four limiting blocks 57 to move outward synchronously. The outward-moving limiting blocks 57 will contact the one-way core 55 and restrict its downward movement. In this way, when the valve core 42 is closed, the one-way core 55 can simultaneously force the one-way component 5 to close and prevent it from opening, thereby ensuring that the gas in the space between the valve core 42 and the one-way core 55 cannot overflow into the equipment.

[0053] Simultaneously, the drive rod 43 moves downward along with the valve core 42, and when the valve core 42 is about to be fully closed, the opening and closing inclined surface 641 will contact the opening surface 432 and push the L-shaped block 431 to move to the right, thereby causing the entire guide post 63 and sealing head 62 to move to the right. A gap is formed between the sealing head 62 and the inner wall of the vent pipe 33, which makes the space between the one-way component 5 and the valve core 42 open, allowing the gas generated inside to be discharged, and the vacuum pump can make the inside a vacuum state, improving safety.

[0054] By installing a one-way valve 5 inside the outlet pipe 31 of the valve body 3, the cryogenic valve can simultaneously function as a shut-off valve and a one-way valve. A drive rod 43 is set below the valve core 42. The one-way valve 5 is equipped with a limiting structure for limiting the one-way core 55. The limiting structure is connected to the drive rod 43 through a pressing rod 56. This means that when the valve core 42 is shut off and the liquid nitrogen and liquid oxygen stop flowing, the one-way valve 5 will also close synchronously, and neither end of it can flow, thus preventing the generated bubbles from entering the equipment.

[0055] By setting an empty pipe 33 on the liquid outlet pipe 31, and installing an empty structure 6 inside the empty pipe 33, the empty structure 6 is connected to the valve core 42 through a drive rod 43. When the valve core 42 is closed, causing the liquid nitrogen and liquid oxygen to stop flowing, the empty structure 6 will also be forced to open synchronously. This makes the space between the one-way component 5 and the valve core 42 open, allowing the gas generated inside to be discharged, thus improving safety.

[0056] The venting structure 6 and the one-way component 5 are linked by the drive rod 43 and the pressure rod 56. When the venting structure 6 is open, the one-way component 5 is in a closed state, and when the one-way component 5 is open, the venting structure 6 is always in a closed state. This ensures that when the cryogenic valve is normally supplying liquid nitrogen and liquid oxygen, the liquid nitrogen and liquid oxygen inside will not leak, thus improving safety.

[0057] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0058] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment, characterized by, The application relates to a valve device, which comprises a long-neck valve cover (2), the top end of the long-neck valve cover (2) is bolted with a pneumatic actuator (1), the lower end of the long-neck valve cover (2) is bolted with a valve body (3), a valve rod (4) is slidably arranged in the long-neck valve cover (2), the top end of the valve rod (4) is connected with a pneumatic shaft of the pneumatic actuator (1), the valve rod (4) is internally provided with the pneumatic shaft, the bottom end of the valve rod (4) is integrally formed with a valve core (42), the valve core (42) extends into the valve body (3), and a driving rod (43) is welded to the bottom end of the valve core (42). The lower end of the valve body (3) is contracted to form an outlet pipe (31), a one-way piece (5) is arranged in the outlet pipe (31), a liquid inlet pipe (32) is welded to the outer ring of the right end of the valve body (3), a discharge pipe (33) is welded to the outer ring of the left end of the outlet pipe (31), and a discharge structure (6) is arranged in the discharge pipe (33), wherein the discharge structure (6) and the one-way piece (5) are connected with the driving rod (43). The one-way piece (5) comprises a fixed pipe (51) fixed to the inner bottom end of the outlet pipe (31), annular frames (52) are welded to the inner top and bottom ends of the fixed pipe (51), a guide sleeve (53) is welded between the upper and lower annular frames (52), a one-way core (55) is slidably sleeved on the guide sleeve (53), a jacking spring (54) is sleeved on the guide sleeve (53), the upper and lower ends of the jacking spring (54) abut against the bottom end of the one-way core (55) and the upper surface of the lower annular frame (52), a limiting piece for limiting the one-way core (55) is arranged in the guide sleeve (53), and a pressing rod (56) is fixed below the driving rod (43) and connected with the limiting piece. The inner wall of the fixed pipe (51) is thickened at the top to form a tapered surface (511), and the outer ring surface sections of the tapered surface (511) and the one-way core (55) are in a tapered structure. The inner ring upper half of the one-way core (55) is designed in a tapered structure to form a sealing surface (552), part of the outer ring surface of the guide sleeve (53) is protruding and thickened to form a sealing surface (531), and the cross sections of the sealing surface (552) and the sealing surface (531) are in a tapered structure. Four groups of ring array distributed through holes (532) are formed in the outer ring of the guide sleeve (53), the limiting piece comprises a plurality of limiting blocks (57), the plurality of limiting blocks (57) are slidably inserted into the through holes (532), the bottom end of the limiting block (57) is fixed with a guide block (571), a supporting ring (58) is fixed to the inner ring of the guide sleeve (53), the supporting ring (58) is penetrated by four circumferentially distributed guide grooves (581) from top to bottom, and the guide block (571) is slidably inserted into the guide groove (581). The inner ring surface lower half of the one-way core (55) is designed in a tapered structure to form an abutting surface (551), and the outwardly facing side of the limiting block (57) is designed in an arc structure to form a limiting inclined surface (572). The inward side arc structure of the limiting block (57) forms a downward inclined surface (573), and the bottom end arc surface of the downward pressing rod (56) forms an arc surface.

2. The cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment according to claim 1, wherein The outer ring of the valve rod (4) is welded with a fixing ring (401), the outer ring of the valve rod (4) is sleeved with a corrugated pipe I (41), the top end of the corrugated pipe I (41) is welded with the fixing ring (401), the bottom end of the corrugated pipe I (41) is provided with a flange, and the flange is pressed between the bottom end of the long neck valve cover (2) and the upper end of the valve body (3). The lower end of the valve rod (4) is sleeved with a guide piece (402), and the guide piece (402) is fixed inside and above the valve body (3).

3. The cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment according to claim 1, wherein The outer ring of the downward pressing rod (56) is sleeved with a corrugated pipe II (561), the bottom end of the corrugated pipe II (561) is welded with the outer ring of the downward pressing rod (56), and the top end of the corrugated pipe II (561) is welded and fixed with the top end of the guide sleeve (53).

4. The cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment according to claim 1, wherein The emptying structure (6) comprises a guide ring seat (61) fixed in the emptying pipe (33), a guide column (63) is slidably inserted on the left and right of the guide ring seat (61), a sealing head (62) is integrally formed on the left end of the guide column (63), and an opening and closing part (64) and a pressing part (65) are welded on the right end of the guide column (63) on the upper and lower sides, respectively.

5. A cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment according to claim 4, wherein The left side upper half inclined surface of the opening and closing part (64) forms an opening and closing inclined surface (641), the lower half of the opening and closing part (64) is vertically downward, the outer ring left side of the driving rod (43) is welded with an L-shaped block (431), and the lower end of the L-shaped block (431) is formed with an inclined opening surface (432).

6. A cryogenic valve for use in a cryogenic liquid nitrogen or liquid oxygen environment according to claim 5, wherein The right side surface of the pressing part (65) is formed with a pressing inclined surface (651), the outer ring left side of the driving rod (43) is welded with an abutting block (433), and the right side surface of the opening and closing part (64) is coplanar with the right side surface of the guide column (63).

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