Radiation precooling type pulse tube cooling system

Abstract

The invention relates to a radiation precooling type pulse tube cooling system, which comprises a pulse tube cooling part, wherein a pressure wave generator, a first regenerator, a cold-end heat exchanger, a pulse tube, a hot-end heat exchanger and an air reservoir are sequentially communicated, and the air reservoir is communicated with the hot-end heat exchanger through an inertia tube; and the radiation precooling type pulse tube cooling system is characterized by also comprising a radiation cooling part which comprises a radiation cooling board and a metal board which is closely connected and combined with the radiation cooling board. The first regenerator is fixed on the metal board; the air reservoir and the hot-end heat exchanger are embedded in the metal board respectively; and the output end of the pressure wave generator is communicated with the input end of the first regenerator through a connecting pipe. The radiation precooling type pulse tube cooling system adopts thermal coupling of the radiation cooling part and the pulse tube cooling part, uses radiation cooling only for the hot end of the pulse tube, requires low cooling capacity, lowers the cooling temperature of a cooler to a required temperature range and is suitable for cooling spatial devices.

Description

technical field [0001] The invention belongs to a pulse tube refrigerating system, and particularly designs a radiation precooling pulse tube refrigerating system suitable for space application. Background technique [0002] With the development of space technology, research on small and miniature cryogenic refrigerators for infrared detectors and high-temperature superconducting devices has aroused great interest from various countries. The payloads of some satellites, especially high-precision remote sensing equipment such as infrared telescopes, focal planes and mirrors of infrared sensors, and low-noise amplifiers of radio receivers, all require a very low background temperature to reduce background thermal noise interference , to improve detection accuracy. The required cooling temperature varies from 200K-2K. There are many refrigeration technologies that can meet this demand, which can be generally divided into radiant refrigeration, thermoelectric refrigeration, st...

AI Technical Summary

Problems solved by technology

TRW once used a specially designed heat radiator to control the dissipation of waste heat of the refrigerator (C K Chan, AIRS Pulse TubeCryocooler System, Cryocooler 9), which uses two opposed pulse tube refrigerators to conduct infrared imaging spectrometer Cooling, but the system uses a supporting structure to discharge the waste heat generated in the compressor and refrigerator through the radiator, and does not use radiation cooling to directly cool the hot end of the pulse tube

There are also people in China who couple radiation refrigeration and pulse tube refrigerators (Liu Yingwen et al., Patent: Space Low Temperature Refrigerator Combined with Radiation Refrigeration and Pulse Tube Refrigeration, Patent No.: CN1388344), but in this system the compressor and The refrigerator is placed together on the radiation cooling plate, and the radiation cooling plate is used to cool the whole system, so the cooling capacity required is large, and the advantages of radiation cooling cannot be brought into play, and the hot end of the pulse tube cannot be lowered to a lower temperature

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