Pulse tube refrigerator

Details Pulse tube refrigerator Pulse tube refrigerator

1997-04-30

1998-12-08

Capossela, Ronald C.

Refrigeration

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

60520, F25B 900

Patent

active

058454985

ABSTRACT:
A pulse tube refrigerator according to the present invention is capable of performing cryogenic operation sufficiently. The cryostat includes regenerators and pulse tubes. Each regenerator has a cold stage at an upper end thereof. Each pulse tube has a low-temperature end portion at a lower end thereof and a high-temperature end portion thereof, the low-temperature end portion being located lower than the cold stage. The cold stage and the low-temperature end portion are connected to each other through a line whose cubic volume is substantially negligible in comparison with that of the pulse tube. Since the pulse tube has working gas of relatively high density in an upper portion thereof and working gas of relatively low density in a lower portion thereof, there is no convection of working gas induced by the gravity. Thus, the cryostat performs cryogenic operation sufficiently without being adversely affected.

REFERENCES:
patent: 5269147 (1993-12-01), Ishizaki et al.
patent: 5412952 (1995-05-01), Ohtani et al.
patent: 5435136 (1995-07-01), Ishizaki et al.

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