Novel low-temperature safety valve

Abstract

The utility model relates to the technical field of low-temperature safety valves, and discloses a novel low-temperature safety valve which comprises a valve body, a fixed seat, a movable seat, a sealing gasket, a threaded sleeve, a clamping mechanism, a dustproof ventilation cover and a threaded rod. Four guide grooves are formed in the inner wall of the valve body at equal intervals, and a first sliding plate and a second sliding plate are slidably connected into the guide grooves correspondingly. The first sliding plate is fixedly connected with the fixed seat, the top of the first sliding plate is fixedly connected with an extension rod, and the top end of the extension rod abuts against the dustproof ventilation cover; the second sliding plate is fixedly connected with the movable base, four connecting holes are formed in the top of the second sliding plate, conical clamping blocks made of rubber are clamped in the connecting holes, receding holes are formed in one ends of the conical clamping blocks, and the other ends of the conical clamping blocks are fixedly connected with the sealing gasket. The threaded rod penetrates through the fixing base and the dustproof ventilation cover, and a connecting assembly is arranged in an inner cavity of the threaded rod.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic safety valve technology, specifically a novel cryogenic safety valve. Background Technology

[0002] A cryogenic safety valve is a pressure protection device specifically designed for handling media in cryogenic environments. It is primarily used in storage tanks, pipelines, and other production equipment to ensure stable operation and safe pressure release even when the medium temperature is below ambient temperature. This type of safety valve is particularly suitable for therapeutic gas cylinders, cryogenic liquid storage tanks, aerospace applications, and cryogenic media storage and handling devices in certain fine chemical processes.

[0003] Chinese patent publication (publication number: CN218408661U) discloses a novel LNG cryogenic safety valve for vehicles, including a valve body, a sealing mechanism provided in the inner cavity of the valve body, a threaded sleeve fixedly connected to the bottom of the valve body, an air inlet pipe connected to the bottom of the valve body, and a locking mechanism provided through the top of the valve body.

[0004] The support plate (the core component used to fix the spring) in the aforementioned comparative document is connected to the inner wall of the valve body by welding. This permanent connection means that once the spring is damaged (such as elastic decay or fatigue fracture in low temperature environment), it cannot be disassembled and replaced separately. The entire valve body must be disassembled or even the entire safety valve must be scrapped.

[0005] In view of this, the present invention proposes a novel cryogenic safety valve to solve the above-mentioned technical problems. Utility Model Content

[0006] To address the shortcomings of the aforementioned background technology, this utility model provides a novel technical solution for a cryogenic safety valve. Through a removable structure of "fixed seat-sliding plate-guide groove," the fixed seat is rigidly connected to the first sliding plate, which slides smoothly along the guide groove of the valve body. After loosening the dustproof and ventilated cover, pulling the threaded rod will cause the fixed seat to detach from the valve body cavity, fully exposing the second spring sandwiched between the fixed seat and the movable seat. This allows for direct replacement without damaging the valve body structure, avoiding overall equipment failure and reducing maintenance costs. Furthermore, after the movable seat is removed from the valve body along with the fixed seat, the sealing gasket, through the elastic interference fit of the conical locking block and the deformation compensation of the clearance hole, can be manually inserted and removed for replacement (when the sealing gasket is pulled, the conical locking block retracts from the connection hole via the clearance hole; the conical locking block of the new sealing gasket automatically locks into the connection hole due to rubber elasticity). This achieves modular maintenance of the "spring + sealing gasket," requiring only targeted replacement for any damaged component.

[0007] This utility model provides the following technical solution: a novel low-temperature safety valve, comprising a valve body, a fixed seat, a movable seat, a sealing gasket, a threaded sleeve, a clamping mechanism, a dustproof and breathable cover, and a threaded rod;

[0008] The inner wall of the valve body is provided with four guide grooves at equal intervals, and a first sliding plate and a second sliding plate are slidably connected in the guide grooves respectively.

[0009] The first sliding plate is fixedly connected to the fixed base, and an extension rod is fixedly connected to its top. The top end of the extension rod abuts against the dustproof and breathable cover.

[0010] The second sliding plate is fixedly connected to the movable seat, and four connecting holes are provided on its top. A rubber conical block is inserted into the connecting holes. One end of the conical block is provided with a clearance hole, and the other end is fixedly connected to the sealing gasket.

[0011] The threaded rod passes through the fixed base and the dustproof and breathable cover, and its inner cavity is provided with a connecting component.

[0012] As a preferred embodiment of this utility model, the connecting assembly includes two guide plates, which are slidably connected to the inner cavity of the threaded rod. A first spring is provided between the two guide plates, and a locking pin is fixedly connected to one side of each guide plate. A connecting seat is fixedly connected inside the movable seat, and a locking hole adapted to the locking pin is provided on the inner wall of the connecting seat.

[0013] As a preferred technical solution of this utility model, a second spring is sleeved on the surface of the threaded rod between the fixed seat and the movable seat. The second spring is used to provide the reset force of the movable seat. The dustproof and breathable cover is connected to the valve body through fine thread.

[0014] As a preferred embodiment of this utility model, the valve body is a stainless steel valve body, and the surfaces of the first sliding plate and the second sliding plate are nitrided.

[0015] As a preferred embodiment of this utility model, the sealing gasket is a fluororubber sealing gasket, and the sealing gasket and the conical block are integrally formed by a vulcanization process.

[0016] As a preferred technical solution of this utility model, the outer wall of the dustproof and breathable cover is provided with anti-slip texture, and the anti-slip texture is distributed at equal intervals along the circumferential direction.

[0017] As a preferred embodiment of this utility model, the cone angle of the conical block is 60°-90°, and the conical block and the connecting hole are interference fit.

[0018] As a preferred technical solution of this utility model, the inner wall of the vent hole of the dustproof and breathable cover is coated with a hydrophobic coating, and the hydrophobic coating is a polytetrafluoroethylene hydrophobic coating.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This utility model uses a removable structure of "fixed seat-sliding plate-guide groove". The fixed seat is rigidly connected to the first sliding plate. The first sliding plate slides smoothly along the guide groove of the valve body. After loosening the dustproof and breathable cover, pulling the threaded rod can drive the fixed seat to detach from the inner cavity of the valve body, so that the second spring sandwiched between the fixed seat and the movable seat is fully exposed and directly replaced. Thus, the replacement does not need to damage the valve body structure, avoids the overall scrapping of the equipment, and reduces maintenance costs.

[0021] 2. After the movable seat of this utility model is removed from the valve body along with the fixed seat, the sealing gasket can be manually removed and replaced through the elastic interference fit of the conical block and the deformation compensation of the relief hole (when the sealing gasket is pulled, the conical block retracts from the connection hole by the relief hole; the conical block of the new sealing gasket automatically locks into the connection hole by the elasticity of the rubber), thereby realizing the modular maintenance of "spring + sealing gasket", and only targeted replacement is needed when a single component is damaged. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a partially enlarged view of the present invention;

[0025] Figure 4 This is a schematic diagram of the extension rod structure of this utility model;

[0026] Figure 5 This is a schematic diagram of the conical locking block structure of this utility model.

[0027] In the diagram: 1. Valve body; 101. Fixed seat; 102. Movable seat; 103. Sealing gasket; 104. Threaded sleeve; 105. Clamping mechanism; 106. Dustproof and breathable cover; 107. Threaded rod; 2. Guide groove; 201. First sliding plate; 202. Second sliding plate; 203. Extension rod; 204. Connecting hole; 205. Conical block; 206. Clearance hole; 3. Guide plate; 301. First spring; 302. Locking pin; 303. Connecting seat; 304. Locking hole; 4. Second spring. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-5 As shown, a novel cryogenic safety valve includes a valve body 1, a fixed seat 101, a movable seat 102, a sealing gasket 103, a threaded sleeve 104, a clamping mechanism 105, a dustproof and breathable cover 106, and a threaded rod 107.

[0030] The inner wall of the valve body 1 is provided with four guide grooves 2 at equal intervals, and a first sliding plate 201 and a second sliding plate 202 are slidably connected in the guide grooves 2 respectively.

[0031] The first sliding plate 201 is fixedly connected to the fixed base 101, and an extension rod 203 is fixedly connected to its top. The top end of the extension rod 203 abuts against the dustproof and breathable cover 106.

[0032] The second sliding plate 202 is fixedly connected to the movable seat 102. Four connecting holes 204 are provided on its top. A rubber conical block 205 is inserted into the connecting hole 204. One end of the conical block 205 is provided with a clearance hole 206, and the other end is fixedly connected to the sealing gasket 103.

[0033] The threaded rod 107 passes through the fixed base 101 and the dustproof and breathable cover 106, and its inner cavity is provided with a connecting component;

[0034] The connecting assembly includes two guide plates 3, which are slidably connected to the inner cavity of the threaded rod 107. A first spring 301 is provided between the two guide plates 3. A locking pin 302 is fixedly connected to one side of each guide plate 3. A connecting seat 303 is fixedly connected inside the movable seat 102. A locking hole 304 adapted to the locking pin 302 is opened on the inner wall of the connecting seat 303.

[0035] A second spring 4 is sleeved on the surface of the threaded rod 107 between the fixed seat 101 and the movable seat 102. The second spring 4 is used to provide the restoring force of the movable seat 102. The dustproof and breathable cover 106 is connected to the valve body 1 by fine thread.

[0036] Fine thread connections offer high precision and excellent sealing, preventing leakage of low-temperature media or external dust through the connection point, while also facilitating disassembly and maintenance.

[0037] Valve body 1 is a stainless steel valve body, and the surfaces of the first sliding plate 201 and the second sliding plate 202 are nitrided.

[0038] Stainless steel valve bodies have excellent low-temperature resistance and corrosion resistance, preventing material embrittlement or media corrosion at low temperatures and ensuring the service life of the valve.

[0039] Nitriding treatment of the first sliding plate 201 and the second sliding plate 202 can improve surface hardness and wear resistance, reduce friction loss in low temperature environment, ensure smooth sliding, and reduce the risk of jamming.

[0040] The sealing gasket 103 is a fluororubber sealing gasket, and the sealing gasket 103 and the conical locking block 205 are integrally formed by vulcanization process;

[0041] Fluororubber has good low-temperature resistance and chemical resistance, and retains its elasticity in low-temperature environments to ensure sealing performance; the vulcanization process makes the sealing gasket 103 and the conical block 205 a whole, preventing leakage at the connection;

[0042] The outer wall of the dustproof and breathable cover 106 is provided with anti-slip texture, which is evenly distributed along the circumference.

[0043] The anti-slip texture increases friction during manual installation or removal, making it easier for operators to tighten or loosen the dustproof and breathable cover 106 in low-temperature environments (where they may be wearing protective gloves), thus improving maintenance convenience.

[0044] The cone angle of the conical block 205 is 60°-90°, and the conical block 205 and the connecting hole 204 are interference fit;

[0045] A cone angle of 60°-90° can generate sufficient radial pressure under interference fit to ensure that the cone block 205 is tightly connected to the connecting hole 204, while facilitating the insertion or removal of the block;

[0046] The inner wall of the ventilation holes of the dustproof and breathable cover 106 is coated with a hydrophobic coating, which is a polytetrafluoroethylene hydrophobic coating.

[0047] The hydrophobic coating prevents external moisture from condensing into ice on the inner wall of the vent, thus avoiding ice blockage that could affect the breathing function of valve 1 (balancing internal and external air pressure).

[0048] Maintenance and Adjustment Working Principle

[0049] Second spring 4 replacement mechanism

[0050] Unlock and disassemble:

[0051] The dustproof vent 106 is connected to the valve body 1 by a fine thread. The anti-slip texture on the outer wall facilitates low-temperature operation. After loosening the vent 106, pull the threaded rod 107 upward.

[0052] The fixed seat 101 slides along the guide groove 2 of the valve body 1 via the first sliding plate 201, and simultaneously disengages from the inner cavity of the valve body along with the threaded rod 107;

[0053] The second spring 4 can be directly removed because the fixed seat and the movable seat 102 are separated and the axial constraint is lost.

[0054] Installation and reset:

[0055] Insert the new second spring 4 into the threaded rod, push the fixing seat 101 back and slide it into the valve body 1 along the guide groove 2, tighten the dustproof and ventilated cover 106, so that the extension rod 203 abuts against the dustproof and ventilated cover 106, and the replacement is completed.

[0056] Gasket 103 Replacement Mechanism

[0057] Component extraction:

[0058] Repeat the "replace the second spring 4" step to make the fixed seat 101 and the movable seat 102 (through the first sliding plate 201 and the second sliding plate 202 along the guide groove 2) simultaneously disengage from the valve body 1;

[0059] Sealing gasket 103 quick-release and quick-install:

[0060] Disassembly: The sealing gasket 103 is interference-fitted with the connecting hole 204 of the movable seat 102 through the conical block 205. When the sealing gasket 103 is pulled, the conical block deforms and contracts through the relief hole 206, disengaging from the connecting hole 204.

[0061] Installation: The conical locking block 205 (60°-90° cone angle, interference fit) of the new sealing gasket 103 is inserted into the connecting hole 204, and the rubber elasticity is restored to the interference fit and fixed, completing the assembly without tools.

[0062] Component reinstallation:

[0063] The movable seat 102 and the fixed seat 101 slide into the valve body 1 along the guide groove 2 in sequence, and the dustproof and breathable cover 106 is tightened to reset the sealing system.

[0064] Manually adjust the sealing level (emergency measure in case the second spring 4 is damaged).

[0065] Press the two guide plates 3 inside the threaded rod 107 to compress the first spring 301, causing the locking pin 302 to retract into the threaded rod 107. After rotating the threaded rod 107 to align with the connecting seat 303, release the guide plates 3. The locking pin 302 will spring into the locking hole 304 under the elastic force of the first spring 301, and the threaded rod 107 will be rigidly connected to the movable seat 102. Rotate the threaded rod 107 again to constrain the linear movement of the movable seat 102 through the guide groove 2, driving it to move up and down. Manually adjust the contact pressure between the sealing gasket 103 and the valve body 1 to temporarily compensate for the sealing function failure of the spring.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this utility model, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel cryogenic safety valve, comprising: Valve body (1), fixed seat (101), movable seat (102), sealing gasket (103), threaded sleeve (104), clamping mechanism (105), dustproof and breathable cover (106) and threaded rod (107); The valve body (1) is characterized by having four guide grooves (2) evenly spaced on its inner wall, and a first sliding plate (201) and a second sliding plate (202) are slidably connected in the guide grooves (2); The first sliding plate (201) is fixedly connected to the fixed base (101), and an extension rod (203) is fixedly connected to its top. The top end of the extension rod (203) abuts against the dustproof and breathable cover (106). The second sliding plate (202) is fixedly connected to the movable seat (102), and four connecting holes (204) are provided on its top. A rubber conical block (205) is inserted into the connecting hole (204). One end of the conical block (205) is provided with a clearance hole (206), and the other end is fixedly connected to the sealing gasket (103). The threaded rod (107) passes through the fixed base (101) and the dustproof and breathable cover (106), and its inner cavity is provided with a connecting component.

2. The novel cryogenic safety valve according to claim 1, characterized in that: The connecting assembly includes two guide plates (3), which are slidably connected to the inner cavity of the threaded rod (107). A first spring (301) is provided between the two guide plates (3). A locking pin (302) is fixedly connected to one side of each guide plate (3). A connecting seat (303) is fixedly connected inside the movable seat (102). A locking hole (304) adapted to the locking pin (302) is opened on the inner wall of the connecting seat (303).

3. A novel cryogenic safety valve according to claim 1, characterized in that: A second spring (4) is sleeved on the surface of the threaded rod (107) between the fixed seat (101) and the movable seat (102). The second spring (4) is used to provide the restoring force of the movable seat (102). The dustproof and breathable cover (106) is connected to the valve body (1) by a fine thread.

4. A novel cryogenic safety valve according to claim 1, characterized in that: The valve body (1) is a stainless steel valve body, and the surfaces of the first sliding plate (201) and the second sliding plate (202) are nitrided.

5. A novel cryogenic safety valve according to claim 1, characterized in that: The sealing gasket (103) is a fluororubber sealing gasket, and the sealing gasket (103) and the conical block (205) are integrally formed by vulcanization process.

6. A novel cryogenic safety valve according to claim 1, characterized in that: The outer wall of the dustproof and breathable cover (106) is provided with anti-slip texture, which is distributed at equal intervals along the circumferential direction.

7. A novel cryogenic safety valve according to claim 1, characterized in that: The cone angle of the conical block (205) is 60°-90°, and the conical block (205) and the connecting hole (204) are interference fit.

8. A novel cryogenic safety valve according to claim 1, characterized in that: The inner wall of the ventilation holes of the dustproof and breathable cover (106) is coated with a hydrophobic coating, which is a polytetrafluoroethylene hydrophobic coating.

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