Multi-expander cryogenic cooler

Details Multi-expander cryogenic cooler Multi-expander cryogenic cooler

1991-10-24

1993-06-01

Fox, John C.

Refrigeration

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

F25B 900

Patent

active

052149226

ABSTRACT:
A cryogenic cooler 100 for cooling a plurality of detector arrays 106 having a single compressor 102 for reciprocating a cooling gas within the cryogenic cooler. A primary transfer line 108 is connected to the compressor for transferring the cooling gas. A reducing coupler 112 is connected to the primary transfer line for distributing the cooling gas between the primary transfer line and a plurality of equally sized secondary transfer lines 118. Each of the secondary transfer lines are connected to one of a plurality of modified expander elements 104. Each of the expander elements are in thermal communication with one of the plurality of detector arrays for cooling that one detector array as the gas is reciprocated within the cooler. In a specific implementation, the pressure wave of the cooling gas during the compression cycle causes the expander elements to cycle a displacer piston 130 to compress the gas at the cold end volume 144, thus allowing a screen mesh 142 in a regenerator 134 to absorb the heat caused by gas compression in a constant volume. During the expansion cycle, the regenerator 134 is cycled in the opposite direction expanding and cooling the gas at the cold. The regenerator screen mesh permits the heat of compression to be dissipated while storing the cooling effect at the cold tip 122 for cooling the detector array.

REFERENCES:
patent: 4846861 (1989-07-01), Berry et al.
patent: 4894996 (1990-01-01), Kazumoto et al.
patent: 5010737 (1991-04-01), Okumura et al.

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