Vacuum pumping pipeline device for spacecraft environmental simulation test equipment

Abstract

The invention discloses a vacuum pumping pipeline device of a spacecraft environment simulation test equipment, comprising: a vacuum rough pumping pipeline [3] of a spacecraft space environment simulator [5] connected in series with a liquid nitrogen oil retaining cold trap [2] ]; there is a liquid nitrogen pipeline [1] in the liquid nitrogen oil-retaining cold trap [2]; according to the present invention, on the liquid nitrogen pipeline [1] in the liquid nitrogen oil-retaining cold trap [2], a roadside The liquid nitrogen pipeline [21] is connected in series with the low temperature shut-off valve [22]; the low temperature shut-off valve [24], [twenty three]. The invention solves the problem of oil return from the mechanical vacuum pump of the rough vacuuming pipeline of the spacecraft environmental simulation test equipment, and achieves the beneficial effects of improving test reliability and effectively preventing the vacuum pump oil from polluting the spacecraft.

Description

technical field [0001] The invention relates to spacecraft environment simulation test equipment, in particular to an oil retaining cold trap liquid nitrogen pipeline in a vacuum pumping pipeline device. Background technique [0002] Before the spacecraft is launched into space, it must conduct a vacuum thermal test simulating a cold and dark space environment in a special space environment simulator to test the rationality of its thermal design and assess the high and low temperature performance of its stand-alone machine. At the initial stage of the test, the space simulation cabin is evacuated by the vacuum pumping system. At present, there are thousands of space environment simulators of various sizes in our country. Most of the rough vacuum pumping units of the vacuum pumping system use oil-filled mechanical vacuum pumps. Oil-filled vacuum pumps have the advantage of high pumping speed. There is a very big disadvantage of the oil vacuum pump, that is, when the pressure...

AI Technical Summary

Problems solved by technology

However, due to equipment layout and plant design, the pipeline between the cold trap and the liquid nitrogen storage tank is too long, and the liquid nitrogen that is introduced at the beginning is basically vaporized, so that from the beginning of liquid supply to the cold trap to the complete cooling of the cold trap It takes more than 20 minutes to come down and take effect, especially in summer when the temperature is high, the cooling time will be longer

[0005] Generally speaking, it only takes ten minutes for the rough vacuum pumping unit to pump the vacuum pipeline from 3000Pa to 10Pa. However, it is difficult for the usual cold trap liquid nitrogen pipeline design to ensure that the cold trap can fully exert the effect of condensing and retaining oil, so it is easy to cause pollution

[0006] The present invention relates to this kind of device that shortens the cooling time of the cold trap. At present, there is no description or report of similar technology of the present invention, and no similar information has been collected at home and abroad.

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