Refrigerated cryogenic envelope

Details Refrigerated cryogenic envelope Refrigerated cryogenic envelope

1975-04-18

1976-11-16

O'Dea, William F.

Refrigeration

Low pressure cold trap process and apparatus

138112, 138113, 165 81, 174 15S, 285 47, 285DIG5, F17C 702

Patent

active

039921697

ABSTRACT:
An elongated cryogenic envelope including an outer tube and an inner tube coaxially spaced within said inner tube so that the space therebetween forms a vacuum chamber for holding a vacuum. The inner and outer tubes are provided with means for expanding or contracting during thermal changes. A shield is located in the vacuum chamber intermediate the inner and outer tubes; and, a refrigeration tube for directing refrigeration to the shield is coiled about at least a portion of the inner tube within the vacuum chamber to permit the refrigeration tube to expand or contract along its length during thermal changes within said vacuum chamber.

REFERENCES:
patent: 2930592 (1960-03-01), Long et al.
patent: 3068026 (1962-12-01), McKamey
patent: 3137143 (1964-06-01), Jacobs et al.
patent: 3399691 (1968-09-01), Schoch et al.
patent: 3466886 (1969-09-01), Doose et al.

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