Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1990-12-28
1992-06-09
Capossela, Ronald C.
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62224, F25B 1902
Patent
active
051196379
ABSTRACT:
A Joule-Thomson cryogenic refrigeration system capable of achieving high temperature stabilities in the presence of varying temperature, atmospheric pressure, and heat load is provided. The Joule-Thomson cryogenic refrigeration system includes a demand-flow Joule-Thomson expansion valve disposed in a cryostat of the refrigeration system. The expansion valve has an adjustable orifice that controls the flow of compressed gas therethrough and induces cooling and partial liquefaction of the gas. A recuperative heat exchanger is disposed in the cryostat and coupled to the expansion valve. A thermostatically self-regulating mechanism is disposed in the cryostat and coupled to the J-T expansion valve. The thermostatically self-regulating mechanism automatically adjusts the cross-sectional area of the adjustable valve orifice in response to environmental temperature changes and changes in power dissipated at a cold head. A temperature sensing and adjusting mechanism is coupled to the cold head for adjusting the temperature of the cold head in response to the change in heat flow in the cold head. The temperature sensing and adjusting mechanism comprises a temperature sensitive diode, a wound wire heater, and an electrical feedback control circuit coupling the diode to the heater. An absolute pressure relief valve is interposed between the output of the cryostat and an exhaust port for maintaining a constant exhaust temperature of the refrigeration system, independent of changes in atmospheric pressure.
REFERENCES:
patent: 3293877 (1966-12-01), Barnes
patent: 4080802 (1978-03-01), Annable
patent: 4126017 (1978-11-01), Butniewski et al.
patent: 4761556 (1988-08-01), Simpson et al.
patent: 5060481 (1991-10-01), Bartlett et al.
Bard Steven
Trimble Curtis A.
Wu Jiunn-Jeng
Capossela Ronald C.
Jones Thomas H.
Manning John R.
Miller Guy M.
The United States of America as represented by the Administrator
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