TURBINE-DRIVEN PUMP ASSEMBLY Russian patent published in 2011 - IPC F04D13/04 F04D9/04 

FIELD: engines and pumps.

SUBSTANCE: turbine-driven pump assembly includes housings 10, 23, 24, 26, centrifugal screw pump 1 and turbine 2. Pump 1 includes centrifugal impeller 4 with hub 5 having inner cavity 32; impeller is installed on outer shaft 3; and screw 14. Shaft 3 is installed in bearing 9 protected with seal 45. Turbine 2 includes two stages 15, 16 with nozzle diaphragms 21, 22 and impellers 19, 20. Inner shaft 11 is installed inside shaft 3 on bearings 12, 13. Impellers 19, 20 of turbine 2 are installed on outer and inner shafts 3, 11 respectively, and screw 14 is installed on outer shaft 3. In hub 5 there are through holes 33 connecting cavity 31 of hub 5 to cavity 8 inside impeller 4. Centrifugal flow controls 36 can be installed inside through holes 33.

EFFECT: improving cavitation properties of pump included in turbine-driven pump assembly, and providing the discharge of axial forces of inner and outer shafts.

3 cl, 5 dwg