Fast cycle water vapor cryopump

Details Fast cycle water vapor cryopump Fast cycle water vapor cryopump

1984-01-25

1985-08-20

Capossela, Ronald C.

Refrigeration

Low pressure cold trap process and apparatus

55269, 62268, 62278, B01D 800

Patent

active

045355975

ABSTRACT:
The disclosure relates to a closed circuit refrigerator having both rapid heating/defrost and cooling rates for the cryosurface and which operates on a continuous basis. The system is based upon a refrigeration process of the type which employs compression of a mixture of vapor refrigerant components with partial condensation and partial evaporation with steps of intermediate cooling and at least partial phase separation. The evaporator of the refrigeration system is placed in a vacuum system as a "Meissner" coil. The cryosurface has, thermally coupled thereto, both a defrost tube and an evaporator tube, the defrost tube carrying refrigerant fluid therein at raised temperature when made operational during a defrost cycle and the evaporator tube carrying low temperature refrigerant fluid therein when made operational during a cool down operation. Appropriate valves determine the refrigerant fluid both, i.e., through cooling heat exchangers or through a heating heat exchanger.

REFERENCES:
patent: 2041725 (1936-05-01), Podbielniak
patent: 3012415 (1961-12-01), La Porte
patent: 3203194 (1965-08-01), Fuderer
patent: 3579998 (1971-05-01), Thibault et al.
patent: 3677025 (1972-07-01), Payne
patent: 3768273 (1973-10-01), Missimer

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