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

FIELD: engines and pumps.

SUBSTANCE: turbine pump comprises bodies 10, 23, a centrifugal pump 1, a screw 14, turbines 15, 16. The centrifugal pump comprises a centrifugal impeller 4 with a hub 5, installed on an outer hollow shaft 3, which is installed in a bearing 9, protected with a seal 47. The turbines 15, 16 comprise nozzle blocks 21, 22 and impellers 17, 18, a body 23, an input and an output nozzles 51, 52. Inside the shaft 3 on bearings 12, 13 there is an inner shaft 11. The impellers 17, 18 of the turbines 15, 16 are installed accordingly on an inner and an outer shafts 3, 11. The screw 14 is installed on the outer shaft 3, at the same time the impeller 18 of the second turbine 16 is arranged with a smaller diameter compared to the impeller 17 of the first turbine 15 and is installed in the back cavity 25, arranged inside the body 23 of the turbines 15, 16 in its central part. The channel 53 of gas supply to the second turbine 16 is arranged in the diaphragm 49, and the channel of gas bleed - in the form of one or several tubes 54, which connect the back cavity 25 with the outlet nozzle 52 of turbines.

EFFECT: improved cavitation properties of a pump included into a composition of a turbine pump and unloading of axial forces in inner and outer shafts.

3 cl, 6 dwg