SCREW-CENTRIFUGAL PUMPING EQUIPMENT Russian patent published in 2009 - IPC F04D9/04 F04D29/66 F04D13/04 

FIELD: motors and pumps.

SUBSTANCE: invention relates to pump engineering. Screw-centrifugal pumping equipment contains impeller 2 with hub 3, installed on shaft 1, and screw 8. Shaft 1 is implemented with cavity 20. In hub 3 there are implemented through openings 19. Inside the hub 3 it is installed additional shaft 6. On one end of shaft 6 from the side of input into impeller 2 there are installed screw 8 and hydroturbine 9. Inside the additional shaft 6 it is implemented hollow center 21, allowing output into hollow 15 between screw 8 and hydroturbine 9 through cross-holes 22. Between shaft 1 and additional shaft 6 it is installed at least one intermediate magnetic bearing 7.

EFFECT: invention is directed to improvement of anti-cavitation properties of pump and increasing of its coefficient of efficiency.

3 cl, 2 dwg