Method and dilution refrigerator for cooling at temperatures bel

Details Method and dilution refrigerator for cooling at temperatures bel Method and dilution refrigerator for cooling at temperatures bel

1983-03-07

1985-02-19

Capossela, Ronald C.

Refrigeration

Processes

62467, 62514R, F25D 100

Patent

active

044997370

ABSTRACT:
The dilution refrigerator operates by sucking a .sup.4 He-rich mixture from a tank and returning it to the tank through a superleak. Thereby the .sup.3 He is separated and returned to the .sup.3 He-rich content of the tank. By this cycling process, a drop in temperature is obtained at the exit of the superleak and through re-mixing of the .sup.3 He with the .sup.4 He. Cycling of the liquid .sup.3 He-.sup.4 He mixture is performed by a bellows pump maintained in a container 16 at a temperature below 2.degree. K. and by specially designed valves comprising a steel ball as a plug and a gold ring as the valve seat.

REFERENCES:
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patent: 3896630 (1975-07-01), Severijns et al.
patent: 3922881 (1975-12-01), Staas et al.
patent: 3978682 (1976-09-01), Severijns et al.
patent: 4047394 (1977-09-01), Severijns et al.
patent: 4136526 (1979-01-01), Chanin et al.
patent: 4136531 (1979-01-01), Staas et al.
patent: 4296609 (1981-10-01), Severijns et al.
patent: 4297856 (1981-11-01), Staas et al.
patent: 4300360 (1981-11-01), Chanin et al.
London et al.: Osmotic Pressure of He.sup.3 with Proposals for a Refrigerator to Work Below 1.degree. K., Physical Review, vol. 23, No. 5, Dec. 1962.

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