Patent ID: 9242032
Filing Date: 2016-01-26
CPC Classification: A61M,F04D,Y10S

Claim Text:
1. A rotary pump comprising: a pumping chamber having a flat upper wall surface; a rotor within said pumping chamber having a substantially circular configuration and a plurality of axially raised bodies spaced apart to define fluid flow paths therebetween, wherein an extended interior sidewall section of each of said fluid flow paths defines a radial boundary to an axially recessed substantially planar polygon section of said rotor; each of said raised bodies having an upper surface area which defines a first inclined region extending axially upwardly toward said upper wall surface from a lower leading edge to an upper trailing boundary region to increase fluid pressure on said rotor beneath said flat upper wall surface in substantially only an axial direction of said rotor when said rotor is rotating, each first inclined region on a raised body contains at least a radially inner edged shroud curved in a direction of a circumference of said rotor, and each said raised body having a surface extending between said curved inner edged shroud and said extended interior sidewall section of said fluid flow path; said upper surface area of each of said raised bodies having a second inclined region extending axially downwardly in tandem from said upper trailing boundary region to a lower trailing edge to decrease axial fluid pressure on said rotor when said rotor is rotating, each of said upper trailing boundary regions extending along a diameter of said rotor oblique to each fluid flow path; said rotor being magnetically biased in an axial direction towards said upper wall surface and said rotor being suspended axially by said axial fluid pressure on said rotor beneath said upper wall surface when said rotor is rotating.