A cryogenic safety valve for a dewar

Abstract

The utility model belongs to valve technical field relates to a low temperature safety valve for dewar bottle, including valve body, be equipped with the valve cavity that penetrates valve body in valve body, the one side of the air inlet end close to valve body in valve cavity is connected with the valve core of sliding, be equipped with a plurality of air groove on the circumference of valve core, the other side in valve cavity is connected with the screw bush through screw thread, the spring is compressed between valve core and screw bush, the air outlet end close to valve body in valve cavity is equipped with the opening and closing assembly for controlling the opening and closing of air outlet end. When the safety valve is in the closed state, the plug is against the sealing slope, the end of the through groove is located in the sleeve, the air outlet end of the valve body is in the closed state, so that the water and dust in the air are prevented from entering the valve body.

Description

Technical Field

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

[0002] Cryogenic safety valves are safety valves suitable for cryogenic media (such as liquid oxygen, liquid nitrogen, liquid argon, liquefied natural gas, LNG, etc.). They automatically open when the pressure in the system exceeds a predetermined value, quickly releasing excessive pressure and preventing equipment or pipelines from rupturing, exploding, or other dangerous situations due to overpressure, thereby ensuring the safe operation of the cryogenic system. Existing cryogenic safety valves, during use, allow water vapor in the air to condense into condensate at low temperatures, and dust from the air may also enter the valve cavity, causing pressure deviations, affecting the normal discharge of gas, and posing safety hazards. Therefore, this utility model proposes a cryogenic safety valve for Dewar flasks. Utility Model Content

[0003] The main objective of this invention is to provide a cryogenic safety valve for Dewar flasks, which solves the problem in the background art where water and dust in the air enter the safety valve, causing pressure deviations and resulting in safety hazards.

[0004] This utility model achieves the above-mentioned objective through the following technical solution: a low-temperature safety valve for Dewar flasks, comprising a valve body, wherein a valve cavity is provided in the valve body, a valve core is slidably connected to one side of the valve cavity near the air inlet end of the valve body, a plurality of air grooves are provided on the circumferential surface of the valve core, a threaded sleeve is threadedly connected to the other side of the valve cavity, a spring is compressed between the valve core and the threaded sleeve, and an opening and closing component for controlling the opening and closing of the air outlet end is provided in the valve cavity near the air outlet end of the valve body.

[0005] Preferably, a spring seat is provided between the spring and the valve core, a positioning ball is provided between the spring seat and the valve core, a spring positioning boss and a spring positioning hole are respectively provided on a pair of opposite surfaces of the spring seat and the screw sleeve, and a gap is left between the circumferential surface of the spring seat and the inner wall of the valve body.

[0006] Preferably, the opening and closing assembly includes a valve stem, the positioning boss is provided with a mounting hole, one end of the valve stem is fixed in the mounting hole, the other end of the valve stem passes through the threaded sleeve, and a through groove is provided on the valve stem along its axial direction. When the air inlet end of the valve body is closed, the end of the through groove is located in the threaded sleeve.

[0007] Preferably, one end of the valve core is provided with 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.

[0008] Preferably, the valve core and the spring seat are provided with positioning grooves on a pair of opposite surfaces, and the positioning ball is located in the positioning groove.

[0009] Preferably, the positioning ball is made of stainless steel.

[0010] The beneficial effects of this utility model are as follows: When the safety valve is in the closed state, the plug abuts against the sealing inclined surface, the end of the through groove is located inside the sleeve, and the air outlet of the valve body is in a closed state, thereby preventing water and dust in the air from entering the valve body; when air pressure enters the air inlet of the valve body, the air pressure pushes the valve core and the spring seat to move, the air inlet of the valve body is opened, the air pressure enters the valve body, the valve stem is pushed out, the end of the through groove is exposed outside the screw sleeve, the air outlet of the valve body opens, and exhaust begins. Attached Figure Description

[0011] Figure 1 This is a diagram illustrating the arrangement of a cryogenic safety valve for a Dewar flask during operation, as shown in the example.

[0012] Figure 2 This is a schematic diagram of the valve core structure.

[0013] The numbers in the diagram represent:

[0014] 1. Valve body; 2. Valve cavity; 3. Valve core; 4. Air groove; 5. Screw sleeve; 6. Spring; 7. Spring seat; 8. Positioning ball; 9. Positioning boss; 10. Positioning hole; 11. Valve stem; 12. Mounting hole; 13. Through groove; 14. Plug; 15. Sealing bevel. Detailed Implementation

[0015] The present invention will be further described in detail below with reference to specific embodiments.

[0016] Example:

[0017] like Figure 1 and Figure 2 As shown, a cryogenic safety valve for a Dewar flask according to this utility model includes a valve body 1, a valve cavity 2 that passes through the valve body 1, a valve core 3 that is slidably connected to one side of the valve cavity 2 near the air inlet end of the valve body 1, a plurality of air grooves 4 that are provided on the circumferential surface of the valve core 3, a threaded sleeve 5 that is threadedly connected to the other side of the valve cavity 2, a spring 6 that is compressed between the valve core 3 and the threaded sleeve 5, and an opening and closing assembly for controlling the opening and closing of the air outlet end that is near the air outlet end of the valve cavity 1.

[0018] A spring seat 7 is provided between the spring 6 and the valve core 3. A positioning ball 8 is provided between the spring seat 7 and the valve core 3. A spring positioning boss 9 and a spring positioning hole 10 are respectively provided on a pair of opposite surfaces of the spring seat 7 and the screw sleeve 5. A gap is left between the circumferential surface of the spring seat 7 and the inner wall of the valve body 1.

[0019] The opening and closing assembly includes a valve stem 11, and a mounting hole 12 is provided on the positioning boss. One end of the valve stem 11 is located in the mounting hole 12, and the other end of the valve stem 11 passes through the threaded sleeve 5. The inner diameter of the threaded sleeve 5 is the same as the diameter of the valve stem 11. A through groove 13 is provided on the valve stem 11 along its axial direction. When the air inlet end of the valve body 1 is closed, the end of the through groove 13 is located in the threaded sleeve 5.

[0020] One end of the valve core 3 is provided with a plug 14, and the inner wall of the valve body 1 is provided with a sealing slope 15, with the end of the plug 14 abutting against the sealing slope 15.

[0021] The valve core 3 and the spring seat 7 are provided with positioning grooves on their opposite surfaces, and the positioning ball 8 is located in the positioning groove.

[0022] The positioning ball 8 is made of stainless steel.

[0023] The beneficial effects of this utility model are as follows: When the safety valve is in the closed state, the plug 14 abuts against the sealing inclined surface 15, the end of the through groove 13 is located inside the sleeve, and the air outlet of the valve body 1 is in a closed state, thereby preventing water and dust in the air from entering the valve body 1; when air pressure enters the air inlet of the valve body 1, the air pressure pushes the valve core 3 and the spring seat 7 to move, the air inlet of the valve body 1 is opened, air pressure enters the valve body 1, the valve stem 11 is pushed out, the end of the through groove 13 is exposed outside the screw sleeve 5, the air outlet of the valve body 1 is opened, and exhaust begins.

[0024] 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 for a dewar, characterized by: The device includes a valve body, which has a valve cavity that extends through the valve body. A valve core is slidably connected to one side of the valve cavity near the air inlet end of the valve body. The valve core has multiple air grooves on its circumferential surface. A threaded sleeve is threadedly connected to the other side of the valve cavity. A spring is compressed between the valve core and the threaded sleeve. An opening and closing assembly for controlling the opening and closing of the air outlet end is provided in the valve cavity near the air outlet end of the valve body.

2. A cryogenic safety valve for a Dewar according to claim 1, characterized in that: A spring seat is provided between the spring and the valve core, and a positioning ball is provided between the spring seat and the valve core. A spring positioning boss and a spring positioning hole are respectively provided on a pair of opposite surfaces of the spring seat and the screw sleeve. A gap is left between the circumferential surface of the spring seat and the inner wall of the valve body.

3. A cryogenic safety valve for a Dewar according to claim 2, characterized in that: The opening and closing assembly includes a valve stem, and the positioning boss is provided with a mounting hole. One end of the valve stem is fixed in the mounting hole, and the other end of the valve stem passes through the threaded sleeve. The valve stem is provided with a through groove along its axial direction. When the air inlet end of the valve body is closed, the end of the through groove is located in the threaded sleeve.

4. A cryogenic safety valve for a Dewar according to claim 1, characterized in that: One end of the valve core is provided with 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.

5. A cryogenic safety valve for a Dewar according to claim 2, characterized in that: The valve core and the spring seat are provided with positioning grooves on their opposite surfaces, and the positioning ball is located in the positioning groove.

6. A cryogenic safety valve for a Dewar flask according to claim 2, characterized in that: The positioning ball is made of stainless steel.

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