Cryogenic refrigeration system

Details Cryogenic refrigeration system Cryogenic refrigeration system

1977-12-23

1979-03-13

King, Lloyd L.

Refrigeration

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

F25B 900

Patent

active

041435206

ABSTRACT:
A simply constructed low input power cyclic cryogenic refrigerator suitable or cooling superconducting quantum interfering devices (SQUID) and similar instruments is provided. A Stirling machine having a multistage displacer and a piston as its only essential moving parts, with helium gas as the working fluid, achieves and maintains a temperature of substantially 8.5.degree. K. The working cylinder and displacer are separated by a tube and are fitted together precisely at steady-state operation rather than at room temperature. The displacer preferably is made of nylon and its cylinder of an epoxy-glass composite to provide the nearly optimum clearance required to maintain the 8.5.degree. K. temperature for continuous periods on the order of several weeks.

REFERENCES:
patent: 3221509 (1965-12-01), Garwin
patent: 3222877 (1965-12-01), Brooks
patent: 3650118 (1972-03-01), O'Neil
patent: 3877239 (1975-04-01), Leo
patent: 4092829 (1978-06-01), Durenec

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