Continuously variable displacement pump with predefined unswept volume
AssigneeHalliburton Energy Services, Inc.
InventorsJim B. Surjaatmadja, Stanley V. Stephenson
Life of this patent
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Abstract
Apparatus and method for controlling an unswept volume in a piston system. The method includes rotating a shaft around a rotation point to drive a piston within a cylindrical volume in a periodic manner, modifying the stroke length of the piston, and moving the center of the shaft relative to the cylindrical volume such that a change in an unswept volume or compression ratio is controlled.
Claims30
A method of controlling an unswept volume in a piston system having a piston disposed in a cylindrical volume, the method comprising the steps of:
- rotating a shaft around a rotation point to drive the piston in a periodic manner within the cylindrical volume;
- modifying the stroke length of the piston;
- and
- moving the shaft relative to the cylindrical volume to control the unswept volume inside the cylindrical volume.
A method of controlling a compression ratio in a piston system having a piston disposed in a cylindrical volume, the method comprising the steps of:
- rotating a shaft around its center to drive the piston in a periodic manner within the cylindrical volume;
- modifying the stroke length of the piston;
- and
- moving the shaft relative to the cylindrical volume to control the compression ratio inside the cylindrical volume.
A piston system, comprising:
- a shaft adapted to rotate about its center;
- a cylindrical volume;
- a piston disposed in the cylindrical volume, wherein the piston is adapted to slidably move within the cylindrical volume;
- a linkage coupling the shaft to the piston;
- a first adjusting mechanism to adjust the relative position of the linkage to the center of the shaft thereby changing the stroke length of the piston;
- and
- a second adjusting mechanism coupled to the shaft for moving the center of the shaft relative to the cylindrical volume to control an unswept volume in the cylindrical volume.
A piston system, comprising:
- a shaft having a longitudinal axis;
- a concentric wheel coupled to the shaft;
- a fixed cam coupled to the concentric wheel;
- a rotatable cam coupled to the fixed cam, wherein the rotatable cam is adapted to rotate with respect to the fixed cam;
- a piston coupled to the rotatable cam, wherein the piston is adapted to slidably move within a cylindrical volume;
- and
- an adjusting mechanism coupled to the shaft, wherein the adjusting mechanism is adapted to move the longitudinal axis of shaft relative to the cylindrical volume.
Dependencies are inferred from the claim text.