AUGER CENTRIFUGAL PUMPS Russian patent published in 2010 - IPC F04D9/04 F04D13/04 

FIELD: engines and pumps.

SUBSTANCE: invention relates to pump production. Proposed pump comprises casings 5, 20, 22, and impeller 2 with hub 3 fitted on shaft 1 that runs in bearing 4 protected by seal 38. Hub 3 houses idle and inner shafts 6, 8. First auger 10 secured on shaft 1 with the help of front taper nut 11 is fitted on one extension of inner shaft 8, while rear taper nut 12 with impeller 13 of the first hydraulic turbine is secured on opposite extension of aforesaid shaft 1. Second auger 15 and impeller 16 of second hydraulic turbine are fitted on extensions of idle shaft 6. First hydraulic turbine nozzle box 14 seats in chamber 30 arranged inside shaft 1, while nozzle box 17 of second hydraulic turbine is located inside hub 3, in chamber 18. Hub 3 has through holes 28 to communicate impeller chamber with chamber 18 made in hub 3. There are two chambers 30 and 31 inside shaft 1 separated by partition 32 that has hole 33. Aforesaid chamber 31 communicates with chamber 39 arranged between bearing 4 and seal 39. Augers 10, 15 can run in opposite directions.

EFFECT: improved cavitation properties.

2 cl, 3 dwg