Method of refrigeration and refrigeration apparatus

Details Method of refrigeration and refrigeration apparatus Method of refrigeration and refrigeration apparatus

1976-08-24

1978-11-21

Capossela, Ronald C.

Refrigeration

Refrigeration producer

Evaporator, e.g., heat exchanger

F25B 1900

Patent

active

041260171

ABSTRACT:
A miniature open circuit refrigerator of the Joule-Thompson type, functions as a demand cryostat by virtue of a pressure-operated refrigerant supply control. The refrigerant fluid under high pressure is introduced at a first relatively rapid flow rate into the cryostat through a calibrated opening that is fully open during the initial or start-up period of the device, for rapid cool down. This calibrated opening is thereafter at least partially closed by a valve which is urged open by a spring and which is urged closed, against the action of the spring, by a bellows containing a gas at high pressure and which is exposed on its outer side to at least a portion of the pressure of the refrigerant fluid. Upon the fall in pressure of the stored refrigerant fluid, toward the end of the start-up, the bellows expands so as at least partially to close the valve, thereby to decrease the flow of refrigerant during the final portion of the cool-down period and during the steady state or on-stream operation of the device. The invention is particularly applicable for the rapid cool down of infrared detection probes.

REFERENCES:
patent: 2991633 (1961-07-01), Simon
patent: 3095711 (1963-07-01), Wurtz, Jr.
patent: 3256712 (1966-06-01), Makowski
patent: 3320755 (1967-05-01), Jepson et al.
patent: 3415078 (1968-12-01), Liston
patent: 3728868 (1973-04-01), Longsworth

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