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US 9,062,675 B2Granted
Rotary lobe pump with wiper blades
OwnerRandy Dixon, Brett Howellinventors
Life of this patent
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Abstract
A positive displacement rotary pump with an improved impeller design integrating replaceable wiper inserts. The impeller generally has or more lobes and an equal number of conjugate surfaces. Each lobe has an arcuate peripheral end comprising a plurality of wiper blades. The wiper blades improve efficiency by making a seal with a pump chamber or the conjugate surface on the other impeller as it rotates. The wiper blades are arranged such that constant and successive contact between wiper blades and impellers is achieved.
Claims18
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.
9 more elements
An impeller capable of being rotated within a chamber of a rotary pump, said chamber having an interior chamber wall, said impeller comprising:
- at least one lobe extending radially outward from a hub interconnected to a drive shaft, the at least one lobe having a first end and a second end, said first end being proximate to said chamber wall and said second end being proximate to said drive shaft;
- said first end comprising a plurality of wiper inserts, said wiper inserts being radially distributed about a periphery of said at least one lobe;
- each of said wiper inserts comprising a blade portion and a biasing portion for operative engagement of said interior chamber wall;
- each of said biasing portions comprising a first end and a second end with a length therebetween and wherein said first ends and said second ends are selectively received in at least one of a slot and a track in opposing ends of said wiper inserts;
- and
- each of said biasing portions operatively interconnected to said lobe and providing a force to bias said blade portions in a direction radially outward from said hub.
3 more elements
A rotary pump, comprising:
- an interior chamber wall;
- a first and second impeller located within said interior chamber wall, each of said first and said second impellers having one or more lobes and an equal amount of substantially arcuate cut-out portions alternatively surrounding a hub, said hub substantially in the center of each of said impellers, said arcuate cut-out portions having a conjugate surface;
- a plurality of wiper inserts interconnected to each of said lobes, said wiper inserts of said first impeller and said wiper inserts of said second impeller radially distributed about said lobes such that said wiper inserts of said first impeller contact said second impeller and said wiper inserts of said second impeller contact said first impeller in an alternating manner;
- each of said wiper inserts comprising a blade portion and a biasing portion, said blade portions adapted to provide a force upon each of said wiper inserts in a direction which is outward from said hub;
- and
- an independent drive shaft interconnected each of said first and second impellers, wherein as said first and second impellers rotate said wiper inserts operatively engage said interior chamber wall to push a fluid through said rotary pump.
3 more elements
Dependencies are inferred from the claim text.