F - Mech Eng,Light,Heat,Weapons – 25 – B
Patent
F - Mech Eng,Light,Heat,Weapons
25
B
62/128
F25B 9/00 (2006.01) F25B 39/02 (2006.01) F25B 41/06 (2006.01) F25D 3/10 (2006.01)
Patent
CA 1082473
Abstract of the Disclosure In cryogenic apparatus for cooling an object to, and maintaining it at, very low temperature and of the kind in which a refrigerating medium comprising superfluid helium II is evaporated from a supply con- tainer into an evacuable exhaust system through a throttle element such element is constituted by a valve comprising a valve element displaceable re- lative to a valve sleeve and the element and sleeve define a passage gap which, in the normal control range, has a width of less than 10µ and a length determined by the position of the element relative to the sleeve. Such valve may have an additional control range in which the width of the passage gap is greater than 10µ. The valve element may be a cylindrical plunger which is axially movable within the sleeve and which defines with the sleeve over at least part of its movement an annular gap having a width less than 10µ. The apparatus may include a regulating means which controls the position of the plunger according to the temperature of the object and also at least one heat exchanger arranged in the exhaust system which is positioned either in the supply container or adjacent the object.
321814
Deutsche Forschungs-Und Versuchsanstalt Fur Luft- Und Raumfahrt
Fetherstonhaugh & Co.
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