Abstract
As an important part of the vacuum system in the space environment simulator, the rough pumping system reduces the vacuum degree of the container from atmospheric pressure to the pressure of the high vacuum system when the space environment simulator starts up. As the key equipment of the rough pumping system, the rough pumping valve plays the role of isolating the rough pumping system from the environmental simulator, and its leakage rate has a direct impact on the vacuum degree that the space environment simulator can reach. Therefore, it is very important to detect the leakage rate of the rough pumping valve. In this paper, the leakage rate detection method of the rough pumping valve is introduced, including the valve delivery stage and valve installation stage to the simulator stage, in order to provide some basis for the follow-up valve leakage rate detection work
Highlights
Factory leakage rate detectionAfter the valve manufacturer completes the valve assembly and debugging, it is required to test the factory leakage rate
As an important part of the vacuum system in the space environment simulator, the rough pumping system reduces the vacuum degree of the container from atmospheric pressure to the pressure of the high vacuum system when the space environment simulator starts up
In order to verify the correctness of the thermal design of the spacecraft and the ability of the thermal control system in each flight stage to adapt to various thermal environments, to determine the optimal thermal control parameters of the thermal control system, and to examine and verify the working ability of the spacecraft, sufficient ground tests must be carried out during the development of the spacecraft
Summary
After the valve manufacturer completes the valve assembly and debugging, it is required to test the factory leakage rate. The single point leakage rate is better than 1.0×10-10 Pa·m/s; C) Close the valve and use helium cover method to test the positive sealing performance of the valve plate, that is, fill the non-sealed side (valve plate) with helium to 1000Pa first, fill the air to 105Pa, the general valve plate leakage rate is better than 1.0×10-10Pa·m/s; D) Similar to the above steps, check valve reverse sealing performance; E) Close the valve, release the cylinder pressure, and use helium mass spectrometry injection to test the sealing condition of the valve plate and shaft seal; In space environment simulator, there are many pneumatic flapper valve, which can achieve bidirectional sealing.
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