20K cold shield refrigerating device

Abstract

The invention relates to spacecraft environment simulation test equipment and discloses a 20K cold shield refrigerating device which comprises a G-M refrigerator (26), wherein the G-M refrigerator (26) is installed on an installation tool (25) through a vacuum sealing surface, a cold shield shielding plate (23) is installed on and connected with a primary cold head (24) of the G-M refrigerator (26), and a secondary cold head (22) of the G-M refrigerator (26) is connected with a 20K cold shield (21) in a fastening and heat conducting way. The 20K cold shield refrigerating device is installed at the top in a vacuum simulation cabin (12) in a vacuum sealing way through the installation tool (25). The invention solves the problems of high development cost, long development cycle and the like of the traditional equipment and has the advantages of high running reliability of the equipment, simplified operation flow, lowered equipment running cost, shortened preparation time before system boot time, and the like.

Description

technical field [0001] The invention relates to spacecraft space environment simulation test equipment, in particular to a 20K cold screen refrigeration device installed in a vacuum simulation cabin with a 100K heat sink cold background. Background technique [0002] Before the launch of the satellite-borne infrared detection remote sensing instrument, in order to determine the mathematical relationship between the output signal of each detection channel and the physical parameters of the target, to check whether the detection channel of the detection instrument is working normally, to determine the dynamic range of the instrument channel, etc. The corresponding infrared radiation calibration and performance test experiments are carried out in the vacuum environment of the environmental simulation equipment. [0003] Satellite-borne infrared detection and remote sensing instruments generally require a temperature lower than 105K to work normally. When flying in orbit, it rel...

AI Technical Summary

Problems solved by technology

[0005] (1) The cost of equipment development is expensive, and only one set of helium turboexpansion refrigeration system will cost as little as four to five million yuan, and as many as tens of millions of yuan;

[0006] (2) The equipment development cycle is long, usually more than 18 months;

[0007] (3) Since the helium gas used as the cooling medium needs to flow through the cold screen, the manufacturing process requirements for the cold screen are very high, but it is still easy to leak cold, and the helium gas leaked from the cold will destroy the vacuum degree in the vacuum simulation chamber. impact test;

[0008] (4) The helium turboexpansion refrigeration system is very complicated, the operation process is cumbersome, the reliability of the operation is not high, and it takes 4-7 days to pre-purify the system before the system is started

[0009] The present invention relates to a new type of 20K cold screen refrigeration device. At present, there is no description or report of similar technology to the present invention, and no similar information has been collected at home and abroad.

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