Japanese Patent JPH0440939

B2

PURPOSE:To accurately detect the liquid surface in an inner cylinder by forming an auxiliary hole in a bore side of an L-shaped pipe which is opened at one end at the inner periphery of the inner cylinder of a rotor and opening the other end with a constant-pressure chamber which has lower pressure than the static pressure in the inner cylinder. CONSTITUTION:One end of an L-shaped pipe is opened at 11a in the vicinity of the inner peripheral surface of the interior 10 of a rotor inner cylinder 2, on which a field winding 1 is wound for a superconductive rotary electric machine, and an auxiliary hole 11b is formed in the bore side. The other end is connected to an exhaust hole 13 formed at the outer periphery of a rotational shaft 4a. The hole 13 communicates with a constant-pressure chamber 16 which has lower pressure than the interior 10 of the inner cylinder. When liquid helium is fed under pressure to the interior 10 of the inner cylinder as designated by an arrow 19, the helium is urged by the centrifugal force to the inner periphery to cool the coil 1, and the evaporated helium is flowed to the directions of arrows 20, 21, but cooling is proceeded, and when the liquid helium reaches the hole 11a, the gaseous helium is flowed from the auxiliary hole 11b, and when the helium reaches R4 at the liquid surface, the gaseous helium does not flow. The liquid surface in the inner cylinder 10 can be detected accurately by detecting the variation in the dynamic pressure in this case.

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SATO KAZUO
NONAKA SHIGEO
OOISHI TAKASHI

JP22490082A

July 06, 1992

December 23, 1982

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TOKYO SHIBAURA ELECTRIC CO

G01F23/00; H02K55/00; H02K55/04

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