TURBO-PUMP UNIT Russian patent published in 2011 - IPC F04D13/04 F04D9/04 

FIELD: engines and pumps.

SUBSTANCE: unit includes housings, centrifugal pump 1, screw 14, two gas turbines 15, 16 and outer and inner shafts 3, 11, Shaft 11 is installed inside shaft 3 on bearings 12, 13. Pump includes centrifugal impeller 4 with hub 5 having inner cavity 34. Impeller 4 is fixed on shaft 3 which is installed in bearing 9 protected with seal 47. Turbines 15, 16 are installed in housing 23 with inlet and outlet branch pipes 51, 52, and include guide vanes 21, 22 and impellers 17, 18. Impellers 17, 18 are installed on shafts 3, 11; screw is installed on shaft 3. Impeller 18 of turbine 16 has smaller diametre than impeller 17 of turbine 15. Impeller 17 of turbine 15 is installed in rear cavity 25 made inside housing 23 of turbine in its central part. Gas supply channel to turbine 16 is made inside outer shaft 3 and connects cavity of inlet branch pipe 51 to cavity 54 before turbine 16. Gas outlet channel is made in the form of annular slot 57, which connects rear cavity 45 of turbine 16 to outlet branch pipe 52 of turbine 15.

EFFECT: improving cavitation properties of pump included in turbine-pump unit, and providing removal of axial forces.

4 cl, 6 dwg