Patent ID: 6595743
Filing Date: 2003-07-22
Classification: A61M,F04D

Abstract:
Hydrodynamic sealing means for a rotary pump, the pump being of the type comprising at least one rotor arranged within a stationary casing, the rotor comprising a hub and at least one fluid impelling blade in the hub, a gap being defined between a periphery of the rotor and the casing, the sealing means comprising:at least one conduit in the rotor for conducting a by-passed portion of the fluid under pumping, the conduit having at least one outlet located at the periphery of the rotor communicating with the gap, and at least one inlet located radially inwardly relative to the outlet; a first portion of the conduit radially extended from the inlet towards a center of the rotor for conducting said by-passed portion of fluid towards the center of the rotor; a second portion of the conduit in fluid communication with the first conduit portion, radially extended from the center of the rotor to the conduit outlet, for conducting the portion of fluid from the center of the rotor to the outlet into the gap.