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US 8,075,288 B2Granted
Screw pump and pumping arrangement
AssigneeEdwards Limited
InventorNigel Paul Schofield
Life of this patent
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Abstract
A screw pump and pumping arrangement including a screw pump having a chamber and externally threaded rotors mounted on shafts for counter-rotation and flow paths with fluid inlets located at a common low pressure side of the chamber.
Claims19
A screw pump comprising:
- a chamber defining with first and second externally threaded rotors mounted on respective shafts rotatably disposed for counter-rotation within the chamber a plurality of flow paths having respective fluid inlets wherein a first one and a second one of the respective inlets are located at a common low pressure side of the chamber and on a common plane, and wherein threads of the first and second rotors are intermeshed at a location adjacent to the first and second inlets, such that fluid entering the chamber via the first and second inlets is moved through the flow paths by the first and second rotors in a manner of positive displacement, wherein the flow paths are isolated from each other such that pressure differentials are maintained among the flow paths when the screw pump is in operation.
A pumping arrangement comprising:
- a screw pump comprising a body defining a chamber housing first and second externally threaded rotors mounted on respective shafts rotatably disposed for counter-rotation within the chamber, the rotors defining with the body first and second flow paths passing through the chamber, each flow path having a respective fluid inlet located in said body;
- a first pumping unit having an exhaust connected to the fluid inlet of the first flow path of the screw pump;
- a second pumping unit having an exhaust connected to the fluid inlet of the second flow path of the screw pump;
- and
- wherein the fluid inlet of the first flow path and the fluid inlet of the second flow path are located at a common low pressure side of the chamber and on a common plane,
- wherein the first and second flow paths are isolated from each other such that pressure differentials are maintained between the first and second flow paths when the screw pump is in operation.
3 more elements
Dependencies are inferred from the claim text.