Patent ID: 6062827
Filing Date: 2000-05-16
Classification: F04C

Abstract:
A rotary pump adapted for pumping fluids, comprising:a housing having an inlet, an outlet and an inner surface that confines a rotary chamber, said inlet and said outlet being spaced apart by and being connected to said rotary chamber;two parallel shafts pivotally mounted on said housing and axially extending through said rotary chamber;two meshing multi-lobe rotors mounted respectively on said shafts within said rotor chamber, each of said rotors having a plurality of lobes projecting radially therefrom toward said inner surface without contacting said inner surface, said lobes and said inner surface confining a plurality of sub-chambers moveable along said inner surface between said inlet and said outlet upon rotation of said rotors;a drive mechanism mounted on said housing for driving said shafts; anda plurality of grooves which are formed in said inner surface adjacent to said outlet and which are elongated circumferentially toward said outlet and which are communicated with said outlet.