| 摘要 |
A vacuum pump is provided with a spacer (Sn) so as to reduce the large gap (gn) formed between an inner wall of a rotor (16-n) and an outer wall shape of a stator column (14) into a predetermined small gap (gl), when the rotor having a different diameter is mounted on the stator column. The predetermined small gap is achieved by detachably fixing the spacer having inner-wall and outer-wall shapes (Sna, Snb) based on the outer-wall and inner-wall shapes (14a, 16-na) of the stator column and the rotor, respectively, to the peripheral outer surface of the stator column. <IMAGE> |
