Open impeller for submergible pump configured for pumping liquid comprising abrasive matter

An open impeller for a submergible pump configured for pumping liquid comprising abrasive matter, the impeller comprising a cover plate, a centrally located hub and at least two spirally swept blades connected to the cover plate and to the hub;

• each blade comprising a leading edge adjacent the hub, a trailing edge at the periphery of the impeller, and a lower edge, the lower edge extending from the leading edge to the trailing edge and separating a suction side of the blade from a pressure side of the blade, the lower edge configured to be located opposite of and facing a wear plate of said submergible pump;
• at least one blade having a winglet at the lower edge, wherein the winglet is connected to and projects from the suction side of said at least one blade, said winglet located radially outside an inner radius (r_inner) of the impeller, extending in the circumferential direction to the trailing edge at the suction side of the blade located at a maximum radius (r_max) of the impeller, and having a lower wear surface configured to be located opposite of and facing the wear plate of the submergible pump,
• wherein said inner radius (r_inner), measured at the interface between the leading edge of the blade and the lower edge of the blade at the suction side of the blade, is equal to the largest of:
• the maximum radius (r_max) of the impeller multiplied by 0.6, and
• an inlet radius (r_inlet) of the impeller multiplied by 1.2.