Low temperature safety valve

Abstract

The utility model belongs to valve technical field relates to a low temperature safety valve, including the valve body, the valve body is sequentially provided with the valve core, spring and the screw bush, the valve core is slidably connected in the valve body, the screw bush is connected in the valve body through the thread, the periphery of valve core and the screw bush is equipped with a plurality of air groove, the spring is compressed between the valve core and the screw bush, be equipped with the valve rod in the valve body, one end of valve rod is connected with the valve core, the other end of valve rod passes the spring and the screw bush, the screw bush is connected with the anti -loose subassembly. The utility model through the stop piece and the limiting groove can prevent the gasket deflection, through the anti -slip tooth between the gasket and the screw bush, can prevent the screw bush deflection loose, avoids the security risk that the safety valve setting pressure change leads to because the screw bush loosens.

Description

Technical Field

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

[0002] A cryogenic safety valve is a safety valve suitable for cryogenic media (such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, LNG, etc.). It automatically opens when the pressure in the system exceeds a predetermined value, rapidly releasing excessive pressure to prevent equipment or pipelines from rupturing or exploding due to overpressure, thus ensuring the safe operation of the cryogenic system. A typical cryogenic safety valve consists of a valve core, a spring, and an adjusting sleeve, arranged from bottom to top. The valve core slides against the inner wall of the valve body, and the spring's two ends abut against the valve core and adjusting sleeve, respectively. The adjusting sleeve is threaded into the valve body. In some high-vibration applications, the adjusting sleeve may loosen and shift, causing the spring, which should be compressed, to stretch. This ultimately leads to a change in the safety valve's set pressure, potentially causing a safety accident. Therefore, this invention proposes a cryogenic safety valve. Utility Model Content

[0003] The main objective of this invention is to provide a cryogenic safety valve that solves the problem in the background art where the safety valve's threaded sleeve loosens in environments with significant vibration, causing safety hazards.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a low-temperature safety valve includes a valve body, in which a valve core, a spring, and a threaded sleeve are sequentially arranged. The valve core is slidably connected to the valve body, and the threaded sleeve is threadedly connected to the valve body. Both the valve core and the threaded sleeve have multiple air grooves on their circumferential surfaces. The spring is compressed between the valve core and the threaded sleeve. A valve stem is provided in the valve body, one end of which is connected to the valve core, and the other end of which passes through the spring and the threaded sleeve. The threaded sleeve is connected to an anti-loosening component.

[0005] Preferably, the anti-loosening component includes a washer that fits tightly against the end face of the threaded sleeve, one end of the spring abuts against the washer, the outer periphery of the washer is provided with limiting plates distributed in a cross shape, the inner wall of the valve body is provided with a limiting groove parallel to its axial direction, the limiting groove extends to the end face of the valve body and forms an opening, the limiting plates extend into the limiting groove, and anti-slip teeth are provided on a pair of opposing surfaces of the washer and the threaded sleeve.

[0006] Preferably, the gasket has a through hole in the middle, and the outer diameter of the gasket does not exceed the shortest distance between the surface of the air groove and the axis of the threaded sleeve.

[0007] Preferably, the valve core and the screw sleeve are provided with positioning bosses on a pair of opposite surfaces, and the end of the spring is fitted onto the positioning bosses.

[0008] Preferably, one end of the valve core is connected to a plug, the inner wall of the valve body is provided with a sealing slope, and the end of the plug abuts against the sealing slope.

[0009] The beneficial effects of this utility model are: the limiting plate and the limiting groove can prevent the gasket from deflecting, and the anti-slip teeth between the gasket and the threaded sleeve can prevent the threaded sleeve from deflecting and loosening, thus avoiding the safety hazards caused by the change in the set pressure of the safety valve due to the loosening of the threaded sleeve. Attached Figure Description

[0010] Figure 1 This is a diagram showing the arrangement of the cryogenic safety valve during operation, as illustrated in the example.

[0011] Figure 2 This is a schematic diagram of the gasket structure.

[0012] The numbers in the image represent:

[0013] 1. Valve body; 2. Valve core; 3. Spring; 4. Screw sleeve; 5. Air groove; 6. Valve stem; 7. Gasket; 8. Limiting plate; 9. Limiting groove; 10. Anti-slip teeth; 11. Positioning boss; 12. Plug; 13. Sealing bevel. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to specific embodiments.

[0015] Example:

[0016] like Figures 1 to 2 As shown, a cryogenic safety valve of this utility model includes a valve body 1. A valve core 2, a spring 3, and a threaded sleeve 4 are sequentially arranged inside the valve body 1. The valve core 2 is slidably connected inside the valve body 1, and the threaded sleeve 4 is threadedly connected inside the valve body 1. Multiple air grooves 5 are provided on the circumferential surfaces of the valve core 2 and the threaded sleeve 4. The spring 3 is compressed between the valve core 2 and the threaded sleeve 4. A valve stem 6 is provided inside the valve body 1. One end of the valve stem 6 is connected to the valve core 2, and the other end of the valve stem 6 passes through the spring 3 and the threaded sleeve 4. The threaded sleeve 4 is connected to an anti-loosening component.

[0017] The anti-loosening component includes a washer 7 that is tightly attached to the end face of the threaded sleeve 4. One end of the spring 3 abuts against the washer 7. The outer periphery of the washer 7 is provided with limiting plates 8 arranged in a cross pattern. The inner wall of the valve body 1 is provided with a limiting groove 9 parallel to its axial direction. The limiting groove 9 extends to the end face of the valve body 1 and forms an opening. The limiting plates 8 extend into the limiting groove 9. Anti-slip teeth 10 are provided on a pair of opposing surfaces of the washer 7 and the threaded sleeve 4.

[0018] The gasket 7 has a through hole in the middle, and the outer diameter of the gasket 7 does not exceed the shortest distance between the surface of the air groove 5 and the axis of the threaded sleeve 4, so as to prevent the gasket 7 from blocking the air groove 5.

[0019] The valve core 2 and the screw sleeve 4 are provided with positioning bosses 11 on their opposite surfaces, and the end of the spring 3 is sleeved on the positioning bosses 11.

[0020] One end of the valve core 2 is connected to a plug 12, and the inner wall of the valve body 1 is provided with a sealing slope 13, with the end of the plug 12 abutting against the sealing slope 13.

[0021] The limiting plate 8 and the limiting groove 9 can prevent the gasket 7 from deflecting. The anti-slip teeth 10 between the gasket 7 and the screw sleeve 4 can prevent the screw sleeve 4 from deflecting and loosening, thus avoiding the safety hazards caused by the change in the set pressure of the safety valve due to the loosening of the screw sleeve 4.

[0022] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A cryogenic safety valve, characterized in that: The device includes a valve body, within which a valve core, a spring, and a threaded sleeve are sequentially arranged. The valve core is slidably connected to the valve body, and the threaded sleeve is threadedly connected to the valve body. Both the valve core and the threaded sleeve have multiple air grooves on their circumferential surfaces. The spring is compressed between the valve core and the threaded sleeve. A valve stem is provided within the valve body, with one end connected to the valve core and the other end passing through the spring and the threaded sleeve. The threaded sleeve is connected to an anti-loosening component.

2. The cryogenic safety valve according to claim 1, characterized in that: The anti-loosening component includes a washer that fits tightly against the end face of the threaded sleeve, one end of the spring abuts against the washer, the outer periphery of the washer is provided with limiting plates distributed in a cross shape, the inner wall of the valve body is provided with a limiting groove parallel to its axial direction, the limiting groove extends to the end face of the valve body and forms an opening, the limiting plates extend into the limiting groove, and anti-slip teeth are provided on a pair of opposite surfaces of the washer and the threaded sleeve.

3. A cryogenic safety valve according to claim 2, characterized in that: The gasket has a through hole in the middle, and the outer diameter of the gasket does not exceed the shortest distance between the surface of the air groove and the axis of the threaded sleeve.

4. A cryogenic safety valve according to claim 1, characterized in that: The valve core and the screw sleeve are each provided with a positioning boss on their opposite surfaces, and the end of the spring is fitted onto the positioning boss.

5. A cryogenic safety valve according to claim 1, characterized in that: One end of the valve core is connected to a plug, and the inner wall of the valve body is provided with a sealing slope, with the end of the plug abutting against the sealing slope.

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