Refrigeration – Gas compression – heat regeneration and expansion – e.g.,...
Patent
1984-03-15
1985-10-01
Capossela, Ronald C.
Refrigeration
Gas compression, heat regeneration and expansion, e.g.,...
60520, 62226, 622281, F25B 900
Patent
active
045437939
ABSTRACT:
In a cryogenics refrigerator having a piston or piston-like displacer reciprocating in a cylinder, the position of the piston or displacer, the temperature at the cold end of the cylinder and/or a refrigeration gas pressure wave are monitored to provide one or more feedback signals. Valves or a linear motor drive are controlled through electronic control circuitry which responds to the feedback signals. A displacer may be driven by pressure differentials on a drive piston or by an electric motor. The preferred elements provide feedback throughout the refrigeration cycle and include a linear variable displacement transformer and an encoder disc. Preferably, the control circuitry is in the form of a programmable digital processor.
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Chellis Fred F.
Moschetto Samuel J.
Capossela Ronald C.
Helix Technology Corporation
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