CENTRIFUGAL PUMP Russian patent published in 2009 - IPC F04D9/04 F04D13/04 

FIELD: engines and pumps.

SUBSTANCE: invention is related to pump engineering. Centrifugal pump comprises impeller with hub installed on shaft and auger. Inside hub there are intermediate and internal shafts. At the ends of intermediate shaft there are accordingly the first auger and impeller of hydraulic turbine second stage, and at the ends of internal shaft - the second auger and impeller of hydraulic turbine first stage. Nozzle blocks of both stages of hydraulic turbine are installed in cavity inside hub. In hub there are through holes that connect impeller cavity to hub cavity. Downstream the second stage of hydroturbine there is overflow channel for return of pumped product between the first and second augers. Overflow channel is arranged in the form of blind axial opening in internal shaft and radial openings arranged between augers and protruding inside blind hole.

EFFECT: improvement of pump cavitation properties.

2 cl, 2 dwg