Patent ID: 6612805
Filing Date: 2003-09-02
Classification: F04D,F16J

Abstract:
A machine comprisinga stationary housing, a shaft having a free end, means rotatably supporting the shaft in the housing, motor means operable to drive the shaft in rotation, a wheel having a hub carried on the shaft at the free end thereof for moving a fluid medium, wherein the housing has a substantially pot-shaped opening through which the shaft engages in a coaxial relationship and the wheel at the free end of the shaft is arranged outside the housing and the hub of the wheel engages into the pot-shaped opening in the housing, forming an annular gap between the inside wall of the pot-shaped opening in the housing and the outside wall of the hub, said annular gap having an exit end, a seal which for sealing off at least one of the shaft and the hub and the housing relative to the medium, and a spiral means which is arranged in the region of the hub non-rotatably therewith to produce a flow of medium which in the annular gap is directed out of same to prevent a deposit of particles, at least one of the outside diameter and the cross-section of the annular gap between the inside wall of the pot-shaped opening in the housing and the outside wall of the wheel hub being of a configuration which continuously to said exit end to provide an unrestricted flow path for discharge of particles at said exit end.