Vacuum protection valve used at super-low temperature
A technology of vacuum protection and vacuum valve, which is applied in the direction of safety valve, balance valve, valve device, etc., can solve the problems of reduced response speed of vacuum terminal, broken vacuum, small flow rate, etc., so as to ensure reliability, improve safety, and avoid continuous supercharged effect
Active Publication Date: 2014-01-01
HUZHOU SANJING CRYOGENIC EQUIP
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Problems solved by technology
It solves the technical problems in the prior art, such as the avoidance of vacuum crosstalk, the flow rate of the vacuum system is too small under the conditions of vacuum holding and vacuum breaking, the response speed of the vacuum terminal is reduced, and even affects the working conditions of breaking vacuum and high-pressure purge.
However, this invention is developed for normal temperature equipment, and it cannot solve the safety problems caused by vacuum failure and decreased sealing performance in ultra-low temperature environments.
Method used
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Embodiment 1
[0014] Example 1, such as figure 1 As shown, a vacuum protection valve for ultra-low temperature includes a vacuum valve body 1. The vacuum valve body 1 has a cylindrical connecting outer wall 10, and a vacuum sleeve 2 is sleeved along the connecting outer wall 10. The vacuum sleeve 2 is provided with an atmospheric through hole. 20. The vacuum valve body 1 is provided with a limit table 11 for limiting the position of the vacuum sleeve 2 along the periphery of the connecting outer wall 10. A vacuum plug 3 is provided at the connection between the vacuum valve body 1 and the vacuum sleeve 2. The vacuum plug 3 includes a vacuum plug that can move in a vacuum. The sealing plug 31 in the valve body 1 and the sealing plug disc 32 that is integrally connected with the sealing plug 31 and can move in the vacuum sleeve 2, the sealing plug 31 is provided with an annular concave sealing groove 310, and the concave sealing groove 310 is in contact with the vacuum An inner sealing rin...
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The invention relates to a vacuum protection valve, in particular to a vacuum protection valve used at a super-low temperature and needed in the chemical industry, industrial and mining enterprises, the national defense and scientific research industry and other industries. The vacuum protection valve comprises a vacuum valve body, wherein the vacuum valve body is provided with a cylindrical connection outer wall, a vacuum sleeve is connected with the connection outer wall in a sleeved mode, an atmosphere through hole is formed in the vacuum sleeve, the vacuum valve body is provided with a limiting stand used for limiting the position of the vacuum sleeve along the periphery of the connection outer wall, the communication portion of the vacuum valve body and the vacuum sleeve is provided with a vacuum plug, the vacuum plug comprises a sealing plugging cylinder capable of moving in the vacuum valve body and a sealing plugging plate integrally connected with the sealing plugging cylinder and capable of moving in the vacuum sleeve, the sealing plugging cylinder is provided with an annular concave sealing groove, an inner sealing ring is arranged between the concave sealing groove and the vacuum valve body, and an outer sealing ring is arranged in an area defined by the sealing plugging plate, the end portion of the vacuum valve body and the inner wall of the vacuum sleeve in an enclosed mode, and accordingly vacuum sealing and overpressure protection functions can be effectively achieved.
Description
technical field [0001] The invention relates to a vacuum protection valve, in particular to a vacuum protection valve for ultra-low temperature required by chemical industry, industrial and mining enterprises, national defense scientific research and other industries. Background technique [0002] At present, the vacuum protection valve mainly compresses the bonnet by spring force, and seals it with the valve seat through a wire seal, or adopts a liquid seal to ensure its vacuum seal. 1) Under the spring force structure, the vacuum seal is mainly realized by the spring force, which requires high spring force. If it is too large, it will not be able to open quickly when the pressure in the vacuum chamber increases to protect the vacuum shell. If it is too small, it will not be able to effectively achieve vacuum sealing. ;2) The liquid-sealed structure requires filling the sealing liquid in the vacuum tube, but in the ultra-low temperature (-196°C) environment, the conventiona...
Claims
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IPC IPC(8): F16K17/26
CPCF16K17/02F16K51/02
Inventor 嵇伟锋吴波
Owner HUZHOU SANJING CRYOGENIC EQUIP