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AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsJames E. Zimmerman, Donald B. Sullivan
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A single stage, twin piston cryogenic refrigerator for cooling supercondung devices. The refrigerator uses helium as the heat transfer medium and is constructed with two nested, concentric pistons, an inner piston and an outer piston, mounted in a cylinder and driven 90.degree. out of phase by a common crankshaft. The inner piston extends through and below the outer piston and is received in a stationary insert mounted in the cylinder. The outer piston has a first piston face which forms a compression space with the stationary insert while the inner piston has a second piston face which forms an expansion space with the cylinder and the insert. The inner piston is formed with upper and lower piston halves joined by a flexible joint positioned in the compression space. Cylindrical regenerator gaps are present at the interface of the inner piston with the stationary insert and at the interface of the stationary insert with the cylinder.
A regenerative cycle refrigerator with a working fluid comprising:
A method of refrigeration using a working fluid in a cylinder in a regenerative heat exchange cycle comprising:
A method of refrigeration using a working fluid in a cylinder having a first hollow piston in the cylinder, a second piston in the first piston and projecting into the cylinder, a gap means between the second piston and the cylinder, a compression space between the first piston and the gap means, an expansion space between the second piston, the gap means and the cylinder, a plurality of regenerative heat exchange gaps formed between the second piston and the cylinder, and means driving the first piston and the second piston, comprising the steps of:
Dependencies are inferred from the claim text.