Patent ID: 6053717
Filing Date: 2000-04-25
Classification: F01C,F04C,F05C

Abstract:
A positive displacement rotary pump, comprising(a) a pump chamber, said pump chamber having an interior chamber wall;(b) one or more impellers rotationally displaced within said pump chamber, each impeller comprising:a hub located substantially in the center of each impeller, wherein each of said hubs rotates around a central axis of each of said impellers;one or more lobes extending radially outward from each of said central axes, each of said lobes having a first end and a second end, said first end proximate to said chamber wall and said second end proximate to said central axis; anda substantially arcuate cut-out portion between each of said lobes on said impellers, each of said arcuate cut-out portions having a conjugate surface;(c) a wiper insert, interconnected to said first end of each of said lobes, wherein each of said wiper inserts operatively engages said interior chamber wall when each of said first ends of each of said lobes is proximate to said interior chamber wall and each of said conjugate surfaces when each of said first ends of each of said lobes is proximate to each of said conjugate surfaces, said wiper insert further having a blade having an edge and an inner end and an elongated portion having an outward end and an inward end, wherein said outward end is interconnected to said inner end of said blade and a retention means having a primary end and a secondary end wherein said primary end is interconnected to said inward end of said elongated portion; and(d) a biasing means interconnected to said secondary end of said retention means for providing a force to each of said wiper inserts in a direction radially outward from each of said central axes; and(e) a drive means interconnected to each of said hubs, wherein said drive means rotates each of said hubs and said impellers to operatively move fluid through said pump chamber.