Fast response Joule-Thomson cryostat

Details Fast response Joule-Thomson cryostat Fast response Joule-Thomson cryostat

1996-08-20

1999-06-22

Kilner, Christopher

Refrigeration

Cryogenic treatment of gas or gas mixture

Liquefaction

62222, F25B 1902

Patent

active

059138890

ABSTRACT:
A cryostat (10') with a heat exchanger (13'); a valve (25') for controlling the flow of fluid through said heat exchanger (13'); and a snap disk (30') for actuating the valve (25'). In a specific embodiment, the snap disk (30') is constructed of at least two different materials (32', 34'), each having a different coefficient of thermal expansion. The snap disk (30') is mounted upon an orifice block (38') and coupled to a needle valve (25') by a connecting rod (40'). The needle valve (25') engages an orifice (16') in the orifice block (38'). The orifice (16') is in communication with the tubing (14') of a heat exchanger (13') via a channel (44') in the orifice block (38'). The geometry of the snap disk (30') is such that when the disk changes state, it snaps due to the thermal properties thereof. This ensures fast response with abrupt closure characteristics and considerable travel. In addition, the snap disk (30') allows for a simplified cryostat design with minimal weight and cost.

REFERENCES:
patent: 4028907 (1977-06-01), Herrington et al.
patent: 4152903 (1979-05-01), Longsworth
patent: 4177650 (1979-12-01), Campbell

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