| 摘要 |
PROBLEM TO BE SOLVED: To reduce the manufacturing cost by arranging a supporting disc, which contacts with a shaft step part formed in a shaft end of a standard motor in the axial direction and which is guided on the shaft end in the radial direction, between a hub of an impeller and the shaft step part of a standard motor on the shaft end. SOLUTION: An impeller 10 of a regenerating pump type compressor 4 is fixed for arrangement in a shaft end 9 of a standard motor 1. A supporting disc 13 and one or plural correcting discs 14 at need are inserted between a hub 11 of the impeller 10 and a shaft step part formed in the shaft end 9. In the case of the standard motor 1, since the axial position and the radial width of the shaft step part 12 are not regulated, the predetermined contact surface in relation to the hub 11 of the impeller 10 is formed by the supporting disc 13. Thickness of the supporting disc 13 is set at a dimension so that the supporting disc contacts with the circumferential surface of a shaft at a sufficient width in a shaft range in front of the shaft step part 12, consequently, so that the supporting disc is guided in the radial direction at need. With this structure, a device at a low cost can be thereby provided. |
