Patent ID: 7938619
Filing Date: 2011-05-10
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; a rotating shaft for rotating said rotating impellers; and a turbine impeller part fixed to a suction side axial end face of said rotating shaft; wherein said rotating impellers include one or more turbine impellers for discharging the sucked gas in said axial direction, and one or more centrifugal impellers, located downstream of said one or more turbine impellers, for further discharging the discharged gas by a centrifugal drag effect, wherein said turbine impeller part and said one or more centrifugal impellers are separately formed, wherein said one or more turbine impellers are included in said turbine impeller part, and wherein at least one stage of said one or more centrifugal impellers is a circumferential flow impeller having a disk part and a vane extending radially from an outer periphery of said disk part, an axial width of said vane being equal to an axial width of said disk part.