PUMP Russian patent published in 2011 - IPC F04D29/06 

FIELD: engines and pumps.

SUBSTANCE: centrifugal screw pump consists of housing, rotor with impeller of double inlet with screws of blades with constant and variable pitch, which are installed before inlet of impeller. Pump has slide bearings and tubes supplying liquid from decreasing space to bearings. Liquid supply tubes to bearings are connected to cylinder installed in decreasing space and smoothly changing to the cone in which holes are made. Cylinder with cone is installed so that first cylindrical part is flown, and then cone is flown; at that, cone angle does not exceed 15°, and total surface area of holes exceeds cross section of tube at least by 2 times.

EFFECT: increasing service life of bearings owing to more qualitative treatment of liquid and simplifying the pump design.

3 dwg