Title:
VACUUM ENCLOSURE
Document Type and Number:
Japanese Patent JP3215268
Kind Code:
B2
Abstract:
PURPOSE: To obtain a vacuum enclosure in which a magnetic fluid can be used under a state equivalent to stationary field by a structure wherein the pole, the permanent magnet and the housing follow the rotation of rotary shaft integrally.
CONSTITUTION: In order to rotate a vacuum enclosure 14, a vacuum sealing means 9 fixed to an evacuation hole 8 is fixed with an evacuation pipe 10. The vacuum sealing means 9 functions to evacuate the vacuum enclosure 14 coupled with a communication hole of a rotary shaft 1 and then the evacuation pipe 10 is removed from the vacuum sealing means 9. In this regard, a shaft seal mechanism receiver 4 comprising a magnet 6, poles 2, 3 and a magnetic fluid 7 follows the rotation of the rotary shaft 1. Consequently, the difference of r.p.m. is decreased between the rotary shaft 1 and the poles 2, 3 and since friction and stir of the magnetic fluid are reduced, the magnetic fluid can be used under a state equivalent to stationary field. This structure eliminates the need of providing a groove for carrying a refrigerant at a pole in order to suppress heating of the magnetic fluid as well as the need of a refrigerant carrying system.
Inventors:
Hideo Mitai
Application Number:
JP18851094A
Publication Date:
October 02, 2001
Filing Date:
August 10, 1994
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
H02K55/00; (IPC1-7): H02K55/00
Domestic Patent References:
| JP5953058A | ||||
| JP60176462A | ||||
| JP6327228A |
Attorney, Agent or Firm:
Takehiko Suzue (6 outside)
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