VERTICAL OIL ELECTRIC PUMP UNIT (VERSIONS), AND SHAFT LINE OF VERTICAL ELECTRIC PUMP UNIT (VERSIONS) Russian patent published in 2012 - IPC F04D13/06 F04D9/04 F04D29/04 

FIELD: engines and pumps.

SUBSTANCE: unit includes in-series connected electric motor, main pump, transmission, booster and intake pipe. Main pump includes rotor shaft and at least one pressure section with impeller and guide vane, supply channel and discharge channel. In booster housing there arranged is screw with the shaft on which there fixed is bushing with multi-flow impeller. Bushing inlet includes anti-cavitation section provided with transition section with radius that is enlarged in flow direction to radius of outlet section. Booster impeller is provided with multi-stage increase in flow direction and in geometrical progression of quantity and number of flows of spiral blades of screw. Sections of the main pump are in-series connected and have the possibility of transmitting the pressure to each next section and/or to the outlet of pressure line, which is added to the pressure created in each of the previous sections.

EFFECT: increase in stability and operating life at enhancement of efficiency and reduction of power consumption and pumping in no-cavitation modes.

18 cl, 5 dwg