Cleaning vacuum air exhaust technology for large-sized space environmental simulator

Abstract

The invention relates to cleaning vacuum air exhaust technology for a large-sized space environmental simulator, which is mainly applied to research of large-sized space environmental simulators, and provides high vacuum test conditions for tests of spacecrafts. In order to obtain high vacuum of the large-sized space simulator, at first, a novel oilless rough pumping unit of a vacuum system exhausts air in a vacuum container in a vacuum manner so that the pressure in the vacuum container is lower than 10Pa, then a turbo molecular pump is utilized to exhaust air in a transitional manner until start vacuum degree of a main pump is achieved, finally, a low-temperature pump is utilized as the main pump for realizing high vacuum air exhaust, so that working vacuum degree of equipment is higher to 1.3X10-3Pa, and the working vacuum degree is maintained until a test is finished. The high vacuum air exhaust technology realizes that cleaning high vacuum for the large-sized space environmental simulator is obtained by the aid of completely oilless vacuum air exhaust equipment.

Description

technical field [0001] The vacuum pumping technology of the present invention belongs to the field of space environment simulation, and specifically relates to the high vacuum pumping technology of a large-scale space environment simulator, which is used for obtaining the vacuum of a space environment simulator test. Background technique [0002] The large-scale space environment simulator mainly simulates the vacuum, cold and dark environments of space, and is used as ground equipment for thermal vacuum and thermal balance tests of spacecraft such as satellites and spacecraft. The degree of vacuum is one of the important parameters of the space environment simulator test, and the vacuum required for the space environment test of the spacecraft is a clean high vacuum. The invented large-scale space environment simulator clean vacuum extraction technology is established to meet this need. At present, the vacuum of large-scale space environment simulators in China is obtained...

AI Technical Summary

Problems solved by technology

At present, the vacuum of large-scale space environment simulators in China is obtained by rough pumping units with oil pollution. A liquid nitrogen cold trap is added to the rough pumping pipeline to reduce the oil return pollution of the rough pumping unit, but it cannot completely prevent oil molecules from entering the vacuum container. It also increases the complexity of equipment operation. In addition, the molecular pump is also lubricated by oil, which will cause oil pollution to the container. The front stage of the molecular pump and the front stage of the cryopump also use oil-sealed mechanical pumps, which are oil-filled vacuum equipment. , now KM6, KM3B equipment adopts this technology

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