Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1995-11-16
1997-01-07
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62 511, F25B 1902
Patent
active
055905382
ABSTRACT:
A stacked multistage Joule-Thomson (J-T) cryostat is described in which each stage comprises a thermally conducting material plate member with fluid passages formed therein and in which the stages are stacked one above the other but separated from each other by thermally insulating standoff supports. Each successive stage in the stack is cooled to successively lower temperature zones by J-T expansion and liquefaction of different coolant gases. Each stage has a restricting passageway connected to a different high pressure gas coolant supply and forming a throttle valve opening into two-phase (liquid-vapor) coolant reservoir passages. The reservoir passages in all but the coldest stage are in heat exchange relation with the high pressure supply passages of the lower boiling temperature coolant gases. The coldest stage is in heat exchange relation with a cold surface on which a device to be cooled can be mounted. Because the stages are constructed of thermally conductive material, there is substantially no thermal gradient within a given stage, and because the stages are thermally isolated from each other, substantial parasitic loads by the heat exchanger section on the cold reservoir for a given coolant is avoided.
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Ambrose Jay H.
Hsu Ike C.
Capossela Ronald C.
Groth Henry J.
Lockheed Missiles and Space Company, Inc.
McHugh Terry
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