Patent ID: 6390768
Filing Date: 2002-05-21
Classification: F04D

Abstract:
A pump impeller comprising:a core member having a back face, a front face and a central bore extending therethrough; the front face of the core member defining a curved surface; a first blade and a second blade fixed to the front face of the core member; each blade having a trailing portion terminating at a trailing edge and a leading portion terminating at a leading edge; the leading portion of the first blade radially overlapping the trailing portion of the second blade; the leading portion of the second blade radially overlapping the trailing portion of the first blade; a first channel defined by the leading portion of the first blade, the trailing portion of the second blade, and the front face of the core member; a second channel defined by the leading portion of the second blade, the trailing portion of the first blade, and the front face of the core member; and wherein the lateral cross-sectional area of the first channel proximate the trailing edge of the second blade is smaller than the lateral cross-sectional area of the first channel proximate the leading edge of the first blade.