Two-stage Stirling and single-stage pulse tube gas coupling cascaded multi-stage low temperature refrigerator

Abstract

The invention discloses a two-stage Stirling and single-stage pulse tube gas coupling cascaded multi-stage low temperature refrigerator. In the refrigerator structure, a two-stage Stirling refrigerator is used as a first stage and a second stage of a three-stage refrigerator; a high-frequency pulse tube refrigerator is connected behind the second stage of the Stirling refrigerator and is used as a third stage; and the high-frequency pulse tube refrigerator has a U-shaped and coaxial layout structure, and can be subjected to phase modulation by combining a normal-temperature inertia tube with a normal-temperature gas storage and combining a low-temperature inertia tube with a low-temperature gas storage. The refrigerator has the advantages of the Stirling refrigerator and the high-frequency pulse tube refrigerator and has obvious thermodynamic advantages. The operating conditions required by the high-frequency pulse tube refrigerator in a liquid helium temperature zone can be acquired at the inlet of a heat accumulator of the pulse tube refrigerator by controlling the phase angle between a discharger and a compressor of the two-stage Stirling refrigerator, the lowest refrigeration temperature can reach that of the liquid helium temperature zone, and refrigerating capacity is supplied to different temperature zones at the same time.

Description

technical field [0001] The invention relates to a regenerative low-temperature refrigerator, in particular to a multi-stage low-temperature refrigerator with two-stage Stirling and single-stage pulse tube gas-coupled cascade connection. Background technique [0002] Compared with the G-M refrigerator, Brayton refrigerator and Stirling refrigerator, the pulse tube refrigerator has no moving parts at the cold end, and has the advantages of simple structure, low cost, small mechanical vibration, high reliability and long life. This makes the pulse tube refrigerator a current research hotspot. Pulse tube refrigerators can be divided into low-frequency pulse tube refrigerators and high-frequency pulse tube refrigerators according to their operating frequency. Among them, high-frequency pulse tube refrigerators have become the long-life low-temperature refrigerators for space due to their small size, light weight, high efficiency, and compact structure. The ideal choice of the ma...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the technical shortcomings that the existing three-stage high-frequency pulse tube refrigerator and three-stage Stirling refrigerator cannot reach the liquid helium temperature zone, and provide a two-stage Stirling and single-stage pulse tube gas coupling stage multi-stage cryogenic refrigerator

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