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US 6,106,224 AGranted
Downthrust pads for submersible centrifugal pumps
AssigneeCamco International Inc.
InventorsKetankumar Kantilal Sheth, Dwight Cameron Chilcoat
Life of this patent
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Abstract
A submersible centrifugal pump is claimed which includes an inner downthrust washer for receiving the downthrust load from the upward movement of the produced fluid, and an outer sealing washer, which is a non-load bearing washer, for allowing the repositioning of the impeller to prevent gaps that create recirculation.
Claims18
A multi-stage submersible centrifugal pump, comprising:
- a housing having an inlet and an outlet;
- a shaft extending generally longitudinally within the housing and through a plurality of pump stages, each of said stages having an axially oriented diffuser disposed generally about a longitudinal axis of said shaft;
- an axially oriented impeller disposed adjacent said diffuser and rotatably engaged about said shaft;
- an inner downthrust washer rotationally engaged to said shaft or said impeller, said thrust washer being adapted for receiving downthrust loads from said impeller;
- an outer sealing washer rotationally engaged to said impeller for preventing fluid recirculation in said stage;
- and
- a stationary thrust pad distinct from said thrust washer, said thrust pad being mounted about said shaft and positioned between said downthrust washer and said diffuser, such that said thrust pad and said downthrust washer are adapted to provide transmission of hydraulic thrust from said impeller to said diffuser without contact between said impeller and said diffuser.
4 more elements
A submersible centrifugal pump, comprising:
- a housing having an inlet and an outlet;
- a shaft extending generally longitudinally within the housing;
- an axially oriented diffuser disposed generally about a longitudinal axis of said shaft;
- an axially oriented impeller disposed adjacent said diffuser and rotatably engaged about said shaft;
- an inner downthrust washer rotationally engaged to said shaft or said impeller, said thrust washer being adapted for receiving downthrust load from said impeller;
- and
- a stationary thrust pad distinct from said thrust washer, said thrust pad being mounted about said shaft and positioned between said downthrust washer and said diffuser, such that said thrust pad and said downthrust washer are adapted to provide transmission of hydraulic thrust from said impeller to said diffuser without contact between said impeller and said diffuser.
4 more elements
Dependencies are inferred from the claim text.