Low air pressure test device

Abstract

The invention relates to a low air pressure test device which is used in a space environment simulation system. The low air pressure test device comprises a vacuum tank, an air pumping system, an air inflation system, a pressure measuring system and a control system, wherein the air pumping system comprises two air pumping pipelines, a first pneumatic valve and an electric pressure regulating valve are in tandem connection to a first air pumping pipeline, and second pneumatic valves and a molecular pump are in tandem connection to a second air pumping pipeline; one end of the first air pumping pipeline and one end of the second air pumping pipeline both communicate with the vacuum tank; the other end of the first air pumping pipeline and the other end of the second air pumping pipeline are converged in a main pipeline; a dry type screw pump is connected to the main pipeline. The pressure measuring system comprises an absolute pressure transmitter and a full measuring range vacuum gauge which are connected with the vacuum tank; the air inflation system comprises a mass flow meter and a magnetic valve; the air pumping system, the pressure measuring system and the air inflation system are all connected with the control system. According to the low air pressure test device provided by the invention, an air pumping rate and an air inflation rate can be controlled at the same time; the pressure can be stabilized in the range of pressure required by tests.

Description

technical field [0001] The invention belongs to the technical field of space environment simulation and relates to a low air pressure test device used in a space environment simulation system. Background technique [0002] The low-pressure test is a very important test item in the space environment simulation test. It mainly assesses whether the spacecraft or spacecraft system components can withstand the low-pressure environment, whether they can work normally in the low-pressure environment, and whether they can withstand rapid changes in air pressure. , to prevent spacecraft or spacecraft system components from failing during launch or while in orbit. The current low-pressure test is mainly completed with a low-pressure test chamber, but the ultimate pressure of the low-pressure test chamber can only reach 10 2 The magnitude of Pa, while the spacecraft or spacecraft components currently conducting deep space exploration require a pressure value lower than 10 when perform...

AI Technical Summary

Problems solved by technology

The current low-pressure test is mainly completed with a low-pressure test chamber, but the ultimate pressure of the low-pressure test chamber can only reach 10 2 The magnitude of Pa, while the spacecraft or spacecraft components currently conducting deep space exploration require a pressure value lower than 10 when performing low-pressure tests. 2 The magnitude of Pa, and the pressure value required by some low pressure tests even reaches 10 -5 Pa level, so the existing low pressure test chamber can not meet the requirements of the test

[0003] For pressure at 10 2 The current common practice for low-pressure tests below Pa is to conduct them in space environment simulation test equipment, but it has two limitations: one is that the depressurization rate cannot be adjusted after the vacuum pumping system is started; the other is that the vacuum pumping system starts Finally, the pressure is gradually reduced before reaching the ultimate vacuum of the equipment, and the pressure cannot be stabilized near the pressure value required by the test.

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