Patent ID: 6174152
Filing Date: 2001-01-16
Classification: F04C

Abstract:
A displacement pump comprising:a casing having an inlet and an outlet, and including a first end, and a second end remote from said first end, said second end having an interior surface;a plurality of rotors, each rotor having a plurality of lobes, connected to shafts, mounted within said casing, said shafts extending substantially perpendicularly to said interior surface of said second end of said casing;a bearing mounting each of said shafts adjacent said first end of said casing for rotation about an axis substantially perpendicular to said interior surface of said second end of said casing, and so that a clearance is defined between said rotors and said interior surface of said first end of said casing;a drive operatively connected to at least one of said shafts adjacent said first end of said casing; andmeans for introducing flushing fluid into said clearance to keep said clearance substantially free of undesirable particles or fibers; andwherein at least one of said rotors has vanes on a surface thereof adjacent said interior surface of said second end of said casing for pumping fibers or particles radially outwardly from said clearance.