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US 5,174,726 AGranted
Liquid pump
OwnerIain S. Findlayinventor
Life of this patent
Estimating the term…
Abstract
A two stage centrifugal and shear pump is characterized by low turbulence for pumping delicate liquids, as blood. Centrifugal first stage is a hollow shaft on which the shear pump discs are mounted. Offset slots in the shaft and disc hubs direct liquid out of the shaft to the discs.
Claims32
A liquid pump comprising:
- a housing having an outlet;
- and
- a rotor in said housing, the rotor having:
- a centrifugal pump first stage with an inlet to receive liquid and an outlet to discharge liquid, and
- a shear pump second stage having an inlet joined with the centrifugal pump outlet to receive liquid therefrom and an outlet to deliver liquid to the housing outlet,
- in which said centrifugal pump is a hollow rotatable shaft connected with said inlet and having an outlet slot therein, said shear pump is a plurality of parallel discs on said shaft, receiving liquid discharged from said shaft slot, the discs being spaced apart at their peripheries to provide an outlet from which liquid is delivered to the housing outlet, the flow area through said slot being greater than the cross-sectional area of the shaft, the flow area at the centers of the discs being greater than the flow area through the slot.
3 more elements
A liquid pump comprising:
- a housing having an outlet;
- and
- a rotor in said housing, the rotor having:
- a centrifugal pump first stage with an inlet to receive liquid and an outlet to discharge liquid in which said centrifugal pump is a hollow rotatable shaft connected with said inlet and having an outlet slot therein in which said slots is offset from the shaft diameter, and
- a shear pump second stage having an inlet joined with the centrifugal pump outlet to receive liquid therefrom and an outlet to deliver liquid to the housing outlet.
2 more elements
A liquid pump comprising:
- a housing having an outlet;
- and
- a rotor in said housing, the rotor having:
- a centrifugal pump first stage with an inlet to receive liquid and an outlet to discharge liquid in which said centrifugal pump is a hollow rotatable shaft connected with said inlet and having a non-radial outlet slot therein, and
- a shear pump second stage having an inlet joined with the centrifugal pump outlet to receive liquid therefrom and an outlet to deliver liquid to the housing outlet.
2 more elements
A liquid pump comprising:
- a housing having an outlet;
- and
- a rotor in said housing, the rotor having:
- a centrifugal pump first stage with an inlet to receive liquid and an outlet to discharge liquid, and
- a shear pump second stage having an inlet joined with the centrifugal pump outlet to receive liquid therefrom and an outlet to deliver liquid to the housing outlet,
- wherein said shear pump second stage includes:
- a pair of outer discs on said rotor having flat outer surfaces spaced from and substantially parallel to the inner walls of the housing and inner surfaces;
- and
- a plurality of intermediate discs on said rotor between said inner surfaces of said outer discs, said intermediate discs being spaced apart and spaced from the center of the inner surfaces of the outer discs, and providing an inlet at which liquid is received from said centrifugal pump, the outer discs and the intermediate discs being spaced apart at their peripheries to provide an outlet from which liquid is delivered to the housing outlet.
6 more elements
A liquid pump comprising:
- a housing having an outlet;
- and
- a rotor in said housing, the rotor having:
- a centrifugal pump first stage with an inlet to receive liquid and an outlet to discharge liquid in which said centrifugal pump is a hollow rotatable shaft connected with said inlet and having an outlet slot therein, and
- a shear pump second stage having an inlet joined with the centrifugal pump outlet to receive liquid therefrom and an outlet to deliver liquid to the housing outlet in which said shear pump is a plurality of parallel discs on said shaft, spaced apart at their centers to provide an inlet at which liquid is received from said shaft slot, the discs being spaced apart at their peripheries to provide an outlet from which liquid is delivered to the housing outlet in which each disc has a hub extending around said rotatable shaft, the hubs each having a slot therein complementary with the outlet slot in the shaft.
2 more elements
Dependencies are inferred from the claim text.