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Nondestructive Atmospheric Depressurization Vacuum Gas Switching Device

A gas switching and vacuum technology, used in liquid/vacuum measurement for liquid tightness, by detecting the appearance of fluid at the leak point, etc., to achieve the effects of fast signal response, fast switching time, and fast signal stability

Active Publication Date: 2019-05-03
BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the problem that different gases to be measured enter the mass spectrometer chamber of the total leak rate tester during the spacecraft total leak rate test

Method used

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  • Nondestructive Atmospheric Depressurization Vacuum Gas Switching Device
  • Nondestructive Atmospheric Depressurization Vacuum Gas Switching Device
  • Nondestructive Atmospheric Depressurization Vacuum Gas Switching Device

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Embodiment Construction

[0021] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] refer to figure 1 , figure 1 It is a structural schematic diagram of the vacuum gas switching device of the present invention. Among them, the vacuum gas switching device is mainly composed of a filter 1, a standard gas circulation pump, a standard gas solenoid valve 3, a sample gas solenoid valve 4, a sample gas circulation pump 5, a flow limiting hole 6, a vacuum corrugated pipe 7 and a gas switching valve body 9 composition. The filter, the standard gas circulation pump and the connected stainless steel pipeline constitute the standard gas circulation system, which can pump the standard gas from the gas source to the gas switching valve, and bring the excess gas back to the standard gas source. The filter, the sample gas circulation pump and the connected stainless steel pipes constitute the sample gas circulation system, which works in the ...

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Abstract

The invention discloses a gas switching apparatus for damage-free pressure reduction from atmospheric pressure to a vacuum. The apparatus herein mainly includes a standard gas circulation pipeline, agas sample circulation pipeline, and a gas switching valve apparatus. The gas switching valve apparatus includes a standard gas electromagnetic valve and a gas sample electromagnetic valve, and a current-limiting aperture which is connected to the same end of the standard gas electromagnetic vale and the gas sample electromagnetic valve. The current-limiting aperture is in communication with a leak detection pore of a central leak rate test instrument through a metal corrugated pipeline. The diameter of the current-limiting aperture fits the entrance of the leak detection instrument in terms of pressure. According to the invention, the apparatus herein overcomes the problems of current gas switching apparatuses, such as the shortened service life of the central leak rate test devices due to the contaminated to-be-tested gas, ratio imbalance of gas components due to long distance of the gas sample, fast pressure reduction from atmospheric pressure or positive pressure to a vacuum of theto-be-tested gas, and also the mixture of different gases in the process of rapid gas switching process.

Description

technical field [0001] The invention belongs to the technical field of spacecraft leak detection. Specifically, the invention relates to a spacecraft that switches between different gases and enters a vacuum mass spectrometer chamber during the total leak rate test, so as to ensure that the sample gas is quickly dropped from the atmospheric pressure to a high vacuum environment, and the sample injection There is no loss in gas composition ratio. Background technique [0002] During the assembly process of the spacecraft, multiple total leak rate tests are required. According to the existing total leak rate test method, standard gas and gas to be tested (also referred to as sample gas) need to be introduced. The pressures of the standard gas and the gas to be tested are both normal pressure (about one standard atmospheric pressure) or positive pressure, and the working pressure of the total leak rate testing instrument is a vacuum environment, generally 10 -6 Pa~10 -1 Pa, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M3/20
Inventor 窦仁超师立侠孙立臣洪晓鹏刘兴悦周雪茜钟亮韩琰窦威杨定魁任国华
Owner BEIJING INST OF SPACECRAFT ENVIRONMENT ENG
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