Cryogenic cooling apparatus
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United States of America Patent
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-
Feb 15, 1983
Grant Date -
N/A
app pub date -
Oct 8, 1981
filing date -
Oct 10, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Cryogenic cooling apparatus of the type including a generally tubular heat exchanger affording two paths, through one of which, in use, refrigerant gas from a supply under pressure is supplied to a Joule-Thompson expansion nozzle to liquify a portion of the gas in a container where the low pressure gas returns through the other path, and a valve member co-operating with the nozzle to vary its effective area for automatically controlling the flow of the refrigerant. The valve member is actuated via an elongate operating member by a movable wall of a bellows situated within or beyond the heat exchanger and exposed on one side to the pressure of a sensing vapor, which, in operation, is in equilibrium with liquid. The operating member is in the form of a tube whose interior communicates with the space containing the sensing vapor, and extending down to the region of the nozzle so that the heat extracted from the sensing vapor in the operating member is a function of the quantity of liquid refrigerant in contact with the operating member.
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