Refrigeration – Low pressure cold trap process and apparatus
Patent
1979-01-24
1981-02-17
Capossela, Ronald C.
Refrigeration
Low pressure cold trap process and apparatus
137 51, 285 47, 285DIG5, 310 54, 310 64, F17C 702
Patent
active
042507138
ABSTRACT:
An apparatus for providing selective fluid communication between a helium transporter and an electric machine with superconductive exciter windings includes a coupling of the transporter which is mated to an undriven end of the shaft of the electric machine. Passages in the coupling and shaft supply liquid helium to the winding and return warmed liquid helium to the transporter. Quick interchangeability of the transporter is facilitated by a bayonet fitting and a spring biased sealing arrangement between corresponding passages in the coupling and shaft. A pressure actuated valve in the passages is provided to interrupt fluid communication when the pressure of the liquid helium falls below a predetermined value. A centrifugal force actuated valve in the passages is provided to interrupt fluid communication when the shaft speed falls below a predetermined value.
REFERENCES:
patent: 3626717 (1971-12-01), Lorch
patent: 3845639 (1974-11-01), Smith, Jr. et al.
patent: 3950959 (1976-04-01), Coureau
patent: 3991588 (1976-11-01), Laskaris
patent: 4056745 (1977-11-01), Eckels
BBC Brown Boveri & Company Limited
Capossela Ronald C.
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