Shunting blade impeller for centrifugal pump

The utility model discloses a shunting blade impeller for a centrifugal pump. The shunting blade impeller comprises blades and an impeller back cover plate, wherein the blades are arranged on the impeller back cover plate; the blades comprise four long blades and four short blades; the four long blades are distributed circumferentially at equal intervals; the four short blades are distributed circumferentially at equal intervals; the short blades are positioned in the middle of a flow channel formed by two long blades; the relation between the inlet diameters D2 of the short blades and the outlet diameter D1 of the impeller is that D2=0.7D1. The shunting blade structure of the centrifugal pump is optimized, so that a jet flow-back trace structure inside the flow channel is improved, the flow in the flow channel becomes more stable, the unstable phenomena of flow separation, secondary flow and the like in the flow channel are reduced, and the comprehensive performance of the centrifugal pump is improved.