Cryogenic refrigerator

Details Cryogenic refrigerator Cryogenic refrigerator

1996-11-08

1998-08-04

Capossela, Ronald C.

Refrigeration

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

60520, 92192, 277235A, 277236, F25B 900

Patent

active

057877122

ABSTRACT:
A cryogenic refrigerator includes a displacer and a cylinder therein for generating a very low temperature. And, a sealing ring is provided in an inserted condition within a ring shaped groove which is formed at an outer peripheral portion of the displacer, the sealing ring having resilience for extending itself outward so that a sealing member on an outer diameter thereof is enlarged and that an outer portion of the sealing ring is slidably contacted to an inner face of the cylinder, and the sealing ring being made of non-magnetic alloy, thereby a magnetic noise and disturbance of an outer magnetic field due to the cryogenic refrigerator are greatly decreased.

REFERENCES:
patent: 4087988 (1978-05-01), Pallaver et al.
patent: 5316321 (1994-05-01), Ishida et al.
patent: 5481879 (1996-01-01), Asami et al.
patent: 5551709 (1996-09-01), Plunkett

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