Progressing cavity pump/motor
AssigneeRobbins & Myers Energy Systems L.P.
InventorMichael Guidry, Jr.
Life of this patent
Estimating the term…
Abstract
A progressing cavity pump/motor includes a stator (12) having a metal interior surface (14) and one or more spiraling internal lobes (16). The rotor (18) has a metal exterior surface (20) and one or more spiraling external lobes (22) for cooperating with the stator to form progressing cavities between the stator and the rotor during rotation of the rotor. At least one of the stator interior surface and the rotor exterior surface include a plurality of spaced grooves (30) in the respective surface, such that fluid flowing to a gap between the stator and the rotor is disrupted by the spaced grooves to reduce fluid leakage between the stator and the rotor.
Claims18
A progressing cavity pump/motor, comprising:
- a stator having an interior surface with two or more spiraling lobes;
- a rotor having an exterior surface with one or more spiraling lobes, the one or more lobes of the rotor cooperating with the two or more lobes of the stator to form progressing cavities between the stator and the rotor during rotation of the rotor within the stator;
- and
- a plurality of spaced grooves formed on a portion of a spiraling lobe on at least one of the stator interior surface and the rotor exterior surface to disrupt the flow of fluid flowing through a gap between the stator interior surface and the rotor exterior surface to reduce fluid leakage between the stator and the rotor;
- wherein ach of the plurality of spaced grooves is parallel to a centerline of the spiraling lobe on which the spaced groove is formed.
A progressing cavity pump/motor, comprising:
- a stator formed having an interior surface and two or more spiraling internal lobes;
- a rotor having an external surface and one or more spiraling external lobes, the rotor cooperating with the stator to form progressing cavities between the stator and the rotor during rotation of the rotor;
- and
- at least one of the stator interior surface and the rotor exterior surface having a plurality of spaced grooves, each of the plurality of spaced grooves being parallel to a centerline of the respective spiraling lobe on which the spaced grooves are formed to disrupt the flow of fluid flowing to a gap between the stator and the rotor to reduce fluid leakage between the stator and the rotor.
A stator for a progressing cavity pump/motor including a rotor having a rigid external surface and one or more spiraling external lobes, the rotor cooperating with the stator to form progressing cavities between the stator and the rotor during rotation of the rotor within the stator, the stator comprising:
- an interior surface and two or more spiraling internal lobes;
- and
- a plurality of spaced grooves to disrupt the flow of fluid flowing through a gap between the interior surface of the stator and the exterior surface of the rotor to reduce fluid leakage between the stator and the rotor;
- wherein each of the plurality of spaced grooves is parallel to a centerline of a stator spiraling lobe.
Dependencies are inferred from the claim text.