STAGE OF SUBMERSIBLE MULTI-STAGE CENTRIFUGAL PUMP Russian patent published in 2020 - IPC F04D29/44 F04D13/10 F04D1/06 F04D29/02 

FIELD: pumps building.

SUBSTANCE: invention relates to pump engineering and, first of all, to multi-stage pumps used in oil production. Submersible multi-stage centrifugal pump stage comprises impeller with hub and drive and driven discs. Blades are located between discs. Distributor comprises a cylindrical part in the form of a cup, upper and lower discs between which the blades are located. Distributor is made in the form of solid cast structure from cast iron. At the outlet of the impeller there is an annular groove, in which additional blades are installed on an additional disc installed in the lower disc of the distributor. Outer diameters of the impeller and the cup of the distributor, the diameter of the blades at the inlet of the distributor and the outer diameter of the impeller are interrelated. Internal diameter of the upper disc of the distributor is not more than thirty seven percent of the outer diameter of the distributor cup. Inner diameter of impeller hub makes not more than twenty two percent of outer diameter of distributor cup.

EFFECT: invention is aimed at improving operating reliability in formation fluid with high content of free gas and mechanical impurities with high efficiency and pressure coefficient of the stage.

4 cl, 1 dwg