Spacecraft leakage rate testing system performing parallel air extraction by molecular pumps and cryogenic pump

Abstract

The invention discloses a spacecraft leakage rate testing system performing parallel air extraction by molecular pumps and a cryogenic pump. The spacecraft leakage rate testing system comprises a leakage detection container for containing a spacecraft to be detected, a cryogenic pump, turbo molecular pumps, compound molecular pumps, dry pumps and supporting pipe valves, wherein the leakage detection container is connected with the cryogenic pump through a valve, and is provided with a turbo molecular pump set and a compound molecular pump set respectively; the turbo molecular pump set consists of multiple parallel turbo molecular pumps and valves which are serially connected mutually; the compound molecular pump set consists of multiple parallel compound molecular pump and valves which are serially connected mutually; the compound molecular pump set and the turbo molecular pump set are serially connected with the dry pumps as prepumps respectively; a helium mass spectrometer leakage detector is arranged between the compound molecular pump set and the dry pump serially connected with the compound molecular pump set. According to the spacecraft leakage rate testing system, through mutual cooperation of the cryogenic pump, the turbo molecular pumps, the compound molecular pumps and the dry pumps, a vast majority of helium leaking out of the spacecraft is detected by the helium mass spectrometer leakage detector, so that the leakage detection sensitivity is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of vacuum leak detection, and in particular relates to a vacuum mass spectrometer leak rate testing system used for testing the total leak rate of spacecraft. Background technique [0002] Leakage failures seriously threaten the normal operation of the spacecraft. A small leak in the propulsion system will affect the life of the spacecraft in orbit. A serious leak in the propulsion system may cause serious accidents such as explosions. Security poses a serious threat. Therefore, the spacecraft must undergo strict leak rate testing during the development process. [0003] The leak rate test of spacecraft is usually divided into single point leak rate test and total leak rate test. The single-point leak rate test is to check all the welds and screw joints of the system with sealing performance requirements one by one, and requires that the leak rate of all tested points meet the technical indicators. In ord...

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Problems solved by technology

However, the volume of spacecraft is generally large, so the volume of the leak detection container is large. If a molecular pump is used to pump air, a large number of molecular pumps must be used, and the cost is huge.

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