Cryogenic refrigerator

Details Cryogenic refrigerator Cryogenic refrigerator

1981-12-30

1982-12-28

Capossela, Ronald C.

Refrigeration

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

F25B 900

Patent

active

043659829

ABSTRACT:
Two embodiments of a Stirling cooler are shown. Each embodiment includes usual compressor portion and cold finger portion. The compressor is improved by inserting a vibration damper in the master piston rod by employing a unique evacuating-charging valve, and be inserting an in-line filter in the cryogen passageway between compressor and cold finger. The cold finger is improved by lining the inside of the displacer-regenerator piston with a highly reflective coating and by inserting a good heat conducting spring between the end of the piston and the opposite wall of the cold finger expansion chamber. In one embodiment, the drive for the compressor crankshaft is improved by using herringbone reduction gears with the layer gear counterbalanced and by using a torsional drive shaft between the electric drive motor and the small herringbone gear. The other embodiment uses direct torsion-shaft drive of the crankshaft, but with a counterbalance on the crankshaft in the form of a weight on a flexible arm.

REFERENCES:
patent: 3851173 (1974-11-01), Taylor et al.
patent: 4277948 (1981-07-01), Horn et al.

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