Multi-stage pulse tube cryocooler

Details Multi-stage pulse tube cryocooler Multi-stage pulse tube cryocooler

2008-04-29

2008-04-29

Doerrler, William C (Department: 3744)

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

Reexamination Certificate

active

11141876

ABSTRACT:
A three-stage pulse-tube cryocooler, in which the third stage pulse tube is arranged below the second stage pulse tube, with a gas flow conduit between the second stage pulse tube heat exchanger and the cold end of the second stage regenerator. The design of the invention is much simpler than a conventional three-stage parallel pulse tube cooler, requiring only two pulse tubes at the warm (room temperature) end and two reservoirs, with a corresponding reduction in the number of associated orifices, passages, etc. In effect, this provides a three stage cryocooler with a two-stage warm end design by putting the second and third stage pulse tubes in series, with a gas flow passage providing gas flow between the second and third stages for gas expansion and refrigeration. The three-stage design allows an intermediate temperature connection between the temperatures of the first and third stages, for applications which require three cooling temperatures.

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Wang, C.; Thummes, G. and C. Heiden, “Experimental Study of Staging Method for Two-Stage Pulse Tube Refrigerators for Liquid 4He Temperatures”, Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany, 1997, vol. 37, No. 12, pp. 857-863.

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