Patent ID: 9618012
Date: 2017-04-11
CPC Classifications: F04D,F05D

Claim:
1. A turbo-molecular pump comprising: a rotor having a plurality of stages of rotor blades and a cylindrical section; a plurality of stages of stationary blades alternately arranged with respect to the plurality of stages of rotor blades; a plurality of spacers stacked to position the plurality of stages of stationary blades; a stator arranged with a gap from the cylindrical section, a base to which the stator is fixed; a spacer cooling section arranged between a lowest spacer of the stacked spacers and the base, the spacer cooling section having a first flow passage through which coolant flows; a heater for heating the stator; a temperature sensor for detecting a temperature of the stator; a base cooling section for cooling the base, the base cooling section having a second flow passage connected in series to the first flow passage; and a temperature controller for controlling circulation of coolant to the first flow passage and the second flow passage connected in series and energization of the heater to maintain the temperature of the stator at a predetermined temperature.