SCREW PUMP Russian patent published in 2010 - IPC F04D3/02 F04D9/04 F04D13/04 

FIELD: engines and pumps.

SUBSTANCE: screw pump includes the main screw 2 with bushing 3 installed in housing 5 on hollow shaft 1, inside which there is additional shaft 6. On shaft 6 there installed is hydraulic turbine and on the end from the inlet to the main screw 2 - additional screw 8. To housing 5 there connected are inlet and outlet housings 15, 17. Hydraulic turbine is combined with additional screw 8, for which purpose inside screw 8 there made is inner cavity 9 interconnected via channel 13 and holes 11, 14 to cavity 18 of outlet housing 17. On external or front surfaces 23, 24 of screw 8 there made are holes 10 interconnecting with inner cavity 9 for creation of torque moment on additional screw 8 combined with hydraulic turbine. Between shaft 1 and additional shaft 6 there can be installed at least one intermediate bearing 7. One bearing or all of them 7 can be magnetic.

EFFECT: improving cavitation properties of pump.

3 cl, 4 dwg