| 摘要 |
An oil-free turbo vacuum pump is capable of evacuating gas in a chamber from atmospheric pressure to high vacuum. The turbo vacuum pump includes a pumping section having rotor blades and stator blades which are disposed alternately in a casing, a main shaft for supporting the rotor blades, and a bearing and motor section having a motor for rotating the main shaft and a bearing mechanism for supporting the main shaft rotatably. A gas bearing is used as a bearing for supporting the main shaft in a thrust direction, spiral grooves are formed inboth surfaces of a stationary part of the gas bearing, and the stationary part having the spiral grooves is placed between an upper rotating part and a lower rotating part which are fixed to the main shaft.
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