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

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump production and can be used to pump over fluids, primarily, not containing abrasive particles. The proposed pump comprises impeller with hub fitted on the shaft. There are intermediate and inner shafts with augers running independently of the impeller in opposite directions and fitted inside the hub. The intermediate shaft extensions accommodate the first auger and wheel rotor of the birotary turbine second stage. The inner shaft extensions accommodate the second auger and wheel rotor of the birotary turbine first stage. The hydraulic turbine first stage rotor box is arranged inside the hub. The hub is furnished with through holes to communicate the impeller space with that of the hub. Aft of the birotary hydraulic turbine second stage, a bypass channel is arranged to return the product pumped over between the first and second augers. The bypass channel represents a blunt axial hole arranged in the inner shaft and radial holes arranged between augers and entering inside the said blunt hole.

EFFECT: improved cavitation properties.

2 cl, 3 dwg