Temperature actuated switch for cryo-coolers

Details Temperature actuated switch for cryo-coolers Temperature actuated switch for cryo-coolers

1993-09-15

1995-01-10

Kilner, Christopher

Refrigeration

Storage of solidified or liquified gas

Including cryostat

62298, 62383, 165 32, 165 96, F25B 1900

Patent

active

053796012

ABSTRACT:
A thermally actuated switch is useful for a redundant cryo-cooled system such as a computer system. In the path between two redundant cryo-heads, a thermally actuated switch which has two sensible parallel thermally conducting plates which are separated by an compressible gas (air) gap which provides a non-conducting fluid and a conducting fluid (mercury). Under operating conditions (below mercury freezing point), the gap is filled with solid mercury, providing an excellent thermal path. If a cooler fails, the temperature on its side of the thermal interface rises until the mercury liquifies. When liquid mercury is displaced from the gap by a non-conducting gas, a thermal open circuit is provided avoiding loss of heat from the alternative cryo-cooler.

REFERENCES:
patent: 3177933 (1965-04-01), Webb
patent: 3225820 (1965-12-01), Riordan
patent: 3391728 (1968-07-01), Kelly
patent: 3430455 (1969-03-01), Stuart et al.
patent: 3450196 (1969-06-01), Bauer
patent: 3525229 (1970-08-01), Denhoy
patent: 3702533 (1972-11-01), Dirne et al.
patent: 3807188 (1974-04-01), Lagodmos
patent: 4689970 (1987-09-01), Ohguma et al.
patent: 4770004 (1988-09-01), Lagodmos

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