| 摘要 |
PURPOSE:To prevent heat from entering by forming a vacuum exhaust passage for communicating between a space and an adiabatic space formed by two magnetic fluid seals in a shaft, and providing a thermal insulating plate between the passage and a helium supply unit, thereby preventing a vacuum damage. CONSTITUTION:A stator which has a winding in a frame is disposed, a superconductive rotor is provided on the inner peripheral side to construct a superconductive rotary electric machine. A shaft 4b of a driver side is coupled directly with one end flange of a torque tube, and a helium transfer coupling (HTC) 11 is provided at the end. A hermetically sealed hole is formed in the shaft 4b, a supply tube 13 and an exhaust tube 14b are disposed, liquid helium is supplied. In this case, two magnetic fluid seals 19, a mechanical seal 24 and thermal insulating plates 20, 25 are provided in the HTC11, and a heater 27 is provided between the seals 24 and 29a. Thus, the shaft 4c is thermally insulated from the shaft 4b by the plate 20 to suppress the cooling of the shaft 4b, thereby performing preferable sealing function. |
