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

FIELD: engines and pumps.

SUBSTANCE: pump includes housing, screw and impeller with a hub, which is installed on shaft. Screw is installed on additional shaft and fixed on it by means of conical nut. Additional shaft is installed with possibility of axial movement and spring-loaded to the other edge from the pump outlet with spring. Inside the hub of impeller there made is inner cavity in which there arranged is nozzle assembly and wheel of hydraulic turbine so that there formed are cavities before nozzle assembly of hydraulic turbine and after wheel of hydraulic turbine. Hydraulic turbine wheel is connected through magnetic coupling to additional shaft. In impeller there made are holes which connect the cavity of impeller to cavity before nozzle assembly of hydraulic turbine. In sleeve and conical nut there made are radial holes, and in additional shaft - axial hole for formation of return channel of some part of pumped product passing through hydraulic turbine to the pump inlet.

EFFECT: improving cavitation properties of pump.

2 cl, 1 dwg