VACUUM PUMP

摘要

PURPOSE: To narrow into a predetermined interval a large interval formed between a rotor inner wall surface and a stator column outer wall surface when loading a rotor with a different outer diameter. CONSTITUTION: A spacer Sn having an inner wall shape Sna adapted to an outer wall shape 14a of the stator column 14 and an outer wall shape Snb adapted to an inner wall shape 16-na of the rotor 16-n is detachably fixed on the stator column 14 outer periphery. The interval gn between the stator column 14 outer wall surface and the rotor 16-n inner wall surface is set to be a predetermined interval gl.