MID STAGE IMPELLER OF CENTRIFUGAL PUMP Russian patent published in 2016 - IPC F04D29/22 

FIELD: engines and pumps.

SUBSTANCE: invention relates to negative displacement pumps, particularly, to impellers of centrifugal pumps. Mid stage impeller of centrifugal pump comprises drive disc, cover disc and vanes arranged therebetween. Cover disc is equipped with additional seal in form of circular ledge, concentric to inner ledge of main seal and forming together with main seal a discharge chamber. In plane perpendicular to axis of impeller, line which connects inlet and outlet edges of blade wheel is inclined to passing through outlet edge of impeller vanes tangent to outer periphery at an angle exceeding by 30-45° exit angle of impeller vanes. Maximum distance from line connecting inlet and outlet edge of blade of impeller to blade in direction perpendicular to said line is 0.15-0.25 of length of line connecting inlet and outlet edges of blade of impeller.

EFFECT: higher efficiency of rotary pump impeller.

3 cl, 2 dwg