Concentric pulse tube expander with vacuum insulator

Details Concentric pulse tube expander with vacuum insulator Concentric pulse tube expander with vacuum insulator

1996-01-24

1997-10-28

Bennett, Henry A.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

62 521, 62520, F25B 900

Patent

active

056807686

ABSTRACT:
An expander for a concentric pulse tube cooler. The inventive expander includes a central pulse tube; a concentric insulation tube disposed around the central pulse tube, the insulation tube having a concentric chamber therein and the chamber being filled with an insulator and the insulator being atmospheric; and a regenerator disposed around the concentric insulation tube. In a particular implementation, the insulator tube includes a vent which allows the insulation chamber to communicate with the surrounding atmosphere. When used in space, the chamber is filled with a void and the insulator becomes a vacuum and provides effective insulation at cryogenic temperatures. The inventive expander allows for an improved concentric pulse tube cooler design comprising a cold finger assembly disposed at a first end of the concentric pulse tube cooler; a heat exchanger assembly disposed at a second end of the concentric pulse tube cooler; and the pulse tube expander assembly of the present invention secured to the heat exchanger. The expander assembly comprising the central pulse tube; the concentric insulation tube disposed around the central pulse tube having the evacuated insulation chamber therein; and the regenerator disposed around the concentric insulation tube as set forth above.

REFERENCES:
patent: 4450693 (1984-05-01), Green et al.

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