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US 4,836,759 AGranted
Rotary pump with orbiting rotor of harder material than stator
AssigneeNautical Services Pty. Ltd.
InventorIan Lloyd
Life of this patent
Estimating the term…
Abstract
A reversible, self-priming rotary pump has a housing with a stator of elastomeric material which is softer than the elastomeric material of the rotor on a cam on shaft. The inlet and exhaust ports are separated by a lobe received in a recess in the stator. As the shaft is rotated, the rotor orbits within the stator to pump the fluid between the inlet and exhaust ports, the stator being at least partially compressed along the line of contact with the rotor to form an efficient seal therebetween.
Claims15
A rotary pump including:
- a pump housing with a stator having an inlet port, and an exhaust port, said stator including an inner surface and an outer surface;
- a rotor, mounted within and engaging the inner surface of the stator, and being mounted on a shaft, the shaft being rotatably mounted in the housing;
- and
- a lobe on the rotor engageable in a recess within the stator to prevent rotation of the rotor, the lobe being disposed intermediate the inlet and exhaust ports;
- at least the outer surface of the rotor and lobe comprising an elastomeric material of a first hardness and at least the inner surface of the stator comprising an elastomeric material of a second hardness different from said first hardness so that at least one of the rotor and lobe, and the stator, are at least partially compressed as the rotor moves in an orbital path within the stator to form two pumping chambers of variable capacity,
- said shaft being mounted substantially coaxially with the stator in end plates in the housing and having an eccentric cam rotatably received in an eccentrically located bore in the rotor.
3 more elements
A rotary pump of double capacity including:
- a pump housing with a stator having an inlet port, and an exhaust port, said stator including an inner surface and an outer surface;
- a rotor, mounted within and engaging the inner surface of the stator, and being mounted on a shaft, the shaft being rotatably mounted in the housing;
- and
- a lobe on the rotor engageable in a recess within the stator to prevent rotation of the rotor, the lobe being disposed intermediate the inlet and exhaust ports;
- at least the outer surface of the rotor and lobe comprising an elastomeric material of a first hardness and at least the inner surface of the stator comprising an elastomeric material of a second hardness different from said first hardness so that at least one of the rotor and lobe, and the stator, are at least partially compressed as the rotor moves in an orbital path within the stator to form two pumping chambers of variable capacity,
- two said stators being fitted within the housing, and said housing being of twice the length of a single capacity pump;
- and
- two said rotors being fitted on a single cam on the shaft.
5 more elements
Dependencies are inferred from the claim text.