Patent ID: 7645116
Filing Date: 2010-01-12
Classification: F04D

Abstract:
1. A turbo vacuum pump, comprising: a suction part for sucking gas in an axial direction; a discharge section in which rotating impellers and stationary impellers are alternately arranged; and a rotating shaft for rotating said rotating impellers; wherein said rotating impellers include one or more turbine impellers for discharging said sucked gas in said axial direction, and one or more centrifugal impellers, located downstream of said one or more turbine impellers, for further discharging said discharged gas by a centrifugal drag effect, and said one or more centrifugal impellers are fixed to said rotating shaft passing therethrough; and further comprising a round tubular ring disposed between said one or more centrifugal impellers and said rotating shaft, and fitted on said rotating shaft by shrink fit.