Cvi Incorporated

Jack E Jensen

Charles B Hood

Harold Cheney Parish

First and second multi-stage cryogenic refrigerators each have a displacer driven by a common motor so that the displacers are substantially 180.degree. out of phase. The final stage of each refrigerator has a regenerator arranged in a heat exchange relationship with counterflow.

Multi-stage cryogenic refrigerators

The cryogenic refrigerator includes a movable displacer within an enclosure having first and second chambers of variable volume. A refrigerant fluid is circulated in a fluid path between said chambers and correlated with movement of the displacer. A spool valve controls introduction of high pressure fluid and low pressure fluid to said chambers in a manner so that such flow is correlated with the pressure difference across said valve.

Cryogenic refrigerator

In a cryogenic refrigerator, a valve member reciprocates to control fluid to and from chambers of variable volume. The valve member is moved in one direction by a cam and in the opposite direction by a fluid spring.

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Columbus, OH, United States of America

Jack E Jensen