Patent ID: 9062675
Filing Date: 2015-06-23
Classification: F04C

Abstract:
1. A rotary pump, comprising: a pump chamber having an interior chamber wall; a first impeller and a second impeller disposed within said pump chamber, each of said impellers comprising: a hub located substantially in the center of said first impeller and said second impeller, wherein each of said hubs rotates around a central axis of each of said impellers; three 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 second end proximate to said central axis; said first end comprising a substantially arcuate periphery; and a substantially arcuate cut-out portion between each of said lobes on said impellers, each of said arcuate cut-out portions having a conjugate surface; each of said lobes comprising a plurality of wiper inserts, wherein each of said wiper inserts operatively engages a conjugate surface when each of said first ends of each of said lobes is proximate to each of said conjugate surfaces; wherein said plurality of wiper inserts are radially distributed about said substantially arcuate periphery such that at least one of said wiper inserts is in contact with at least one of said impellers throughout rotation of said impellers; each of said wiper inserts comprising a biasing element for providing a force to each of said wiper inserts in a direction radially outward from each of said central axes, said biasing element comprising a leaf spring and wherein peripheral ends of said leaf spring are inserted into at least one of a slot and a track provided in at least one corresponding end of the wiper insert; and a drive shaft interconnected to each of said hubs, wherein each of said drive shafts independently rotate each of said hubs and said impellers to operatively move fluid through said pump chamber.