Patent ID: 6416290
Filing Date: 2002-07-09
Classification: F04D,F05D

Abstract:
A turbomolecular pump comprising: a motor; a rotor blade unit having a plurality of axially spaced-apart rotor blades rotated by the motor; a stator opposing the rotor blade unit and having a plurality of fixed blades confronting the rotor blades with a slight gap between confronting fixed blades and rotor blades; an outer casing for containing the motor, the rotor blade unit, the stator and the fixed blades and having a base portion; an inlet port for receiving a gas; an exhaust port for discharging the gas; and rotor blade temperature detecting means for estimating a temperature of the rotor blade unit and comprising one or more radiation thermometers disposed in one of the base portion and a flange portion of the inlet port out of contact with the rotor blade unit.