To use a coolant supplied, to and exhausted from a superconducting rotary electric machine at cryogenic temperatures, and to suppress the ingress of heat from external to the coolant to make a cooling device for cooling the coolant again relatively small in size.
First and second rotary vacuum thermal insulating pipes 2, 3 are coupled to an end of a rotor 1. A fixed vacuum thermal insulating pipe 12 is placed inside the first rotary vacuum thermal insulating pipe 2, and its open end is placed in the first rotary vacuum thermal insulating pipe 2. The second rotary vacuum thermal insulating pipe 3 is rotatably supported by a fixed body 4, and is encircled with a fixed shaft 6. A vacuum thermal insulating portion 7 is provided on the inner circumferential surface of the fixed shaft 6, and a sealing member 8 and a magnetic fluid seal 9, comprising fluororesin are provided between the vacuum thermal insulating portion 7 and the second rotary vacuum thermal insulating pipe 3. The coolant of the cooling device 14 flows through a channel encircled with a vacuum thermal insulating layer to cool the rotor 1 and is recovered.
COPYRIGHT: (C)2007,JPO&INPIT
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