Patent ID: 8109744
Filing Date: 2012-02-07
Classification: F04D

Abstract:
1. A turbo vacuum pump comprising: a casing; a pumping section having rotor blades and stator blades which are disposed alternately in said casing; a main shaft for supporting said rotor blades; and a bearing and motor section having a motor for rotating said main shaft and a bearing mechanism for supporting said main shaft rotatably; wherein a gas bearing is used as a bearing for supporting said main shaft in a thrust direction, spiral grooves are formed in both surfaces of a stationary part of said gas bearing, and said stationary part having said spiral grooves is placed between an upper rotating part and a lower rotating part which are fixed to said main shaft; and wherein said upper rotating part has a first surface and a second surface opposite to said first surface, a centrifugal blade element for compressing and evacuating gas in a radial direction is formed on said first surface of said upper rotating part, and said second surface faces said spiral grooves of said stationary part.