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US 8,985,977 B2Granted
Asymmetric lobes for motors and pumps
AssigneeBaker Hughes Incorporated
InventorsCarsten Hohl, Helmut G. Benning
Life of this patent
Estimating the term…
Abstract
An apparatus for use in a wellbore may include a stator having a bore and a rotor disposed in the bore. Either or both of the rotor and the stator may include a layer that has an asymmetrical material property profile along at least a portion of a circumference of that layer.
Claims20
An apparatus for use in a wellbore, comprising:
- a stator having a bore defined by an inner first layer;
- and
- a rotor disposed in the bore and having a outer second layer, the first layer and the second layer cooperating to form at least one fluid chamber and at least one seal at substantially the same time during relative rotation between the rotor and the stator,
- wherein a load section and a seal section are defined along a layer selected from at least one of:
- (i) the first layer, and (ii) the second layer, and wherein the load section has a material property that is asymmetric with a material property of the seal section.
2 more elements
A method for use in a wellbore, comprising:
- disposing a rotor in a bore of the stator, wherein the stator has an inner first layer and the rotor has an outer second layer, wherein a load section and a seal section are defined along a layer selected from at least one of:
- (i) the first layer, and (ii) the second layer, and wherein the load section has a material property that is asymmetric with a material property of the seal section;
- and
- forming at least one fluid chamber and at least one seal using the stator and the rotor during relative rotation between the rotor and the stator.
1 more element
An apparatus for use in a wellbore, comprising:
- a stator having a lobe, a bore, and a layer disposed over the lobe, wherein the layer has a load section on one side of the lobe and a seal section on an opposing side of the lobe, wherein the load section has a material property that is asymmetric with a material property of the seal section;
- and
- a rotor disposed in the bore.
Dependencies are inferred from the claim text.