Patent ID: 8540477
Filing Date: 2013-09-24
Classification: A61M,F04D,Y10S

Abstract:
1. A rotary pump comprising: a pumping chamber; a rotor within said pumping chamber having a plurality of axially raised bodies spaced apart to define fluid flow paths therebetween; each of said raised bodies having an upper surface area along which a first inclined region extends from a leading edge to a trailing boundary region, a gap between each first inclined region and an axially upper interior wall of said pumping chamber decreasing towards said trailing boundary region to increase axial fluid pressure in said gap when said rotor is rotating; said upper surface area of each of said raised bodies having a second inclined region extending from said trailing boundary region to a trailing edge of said second inclined region, a gap between each of said second inclined regions and said axially upper interior wall increasing towards said trailing edge to decrease axial fluid pressure in said gap when said rotor is rotating; inner and outer boundaries of each first inclined region being defined by respective inner and outer shrouds, an interior side of each inner shroud defining a downwardly tapered and concavely shaped inwardly facing surface area coextensive with said inner shroud and descending toward the center of the rotor.