Tension-force coupled high-pressure pumping
AssigneeAgilent Technologies, Inc.
InventorHaertl Hans-Georg
Life of this patent
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Abstract
A pumping apparatus (200) for delivering liquid at a high pressure (Psys) at which compressibility of the liquid becomes noticeable, comprises a piston (20) adapted for reciprocation in opposing directions in a pump working chamber (30), and a drive (40) coupled to the piston (20) to apply a tension force onto the piston (20) in order to move the piston (20) into a drive direction (50).
Claims10
A pumping apparatus for delivering liquid at a high pressure at which compressibility of the liquid becomes noticeable, comprising
- a piston adapted for reciprocation in opposing directions in a pump working chamber,
- a drive coupled to the piston to apply a tension force onto the piston in order to move the piston into a drive direction, and
- a return mechanism, coupled to the piston, being adapted for counteracting against the movement of the piston into the drive direction and to apply a tension force onto the piston in order to move the piston into a return direction opposite to the drive direction,
- wherein the return mechanism is coupled to a side of the piston facing into pump working chamber.
A method of delivering a liquid at a high pressure at which compressibility of the liquid becomes noticeable, comprising
- reciprocating a piston in opposing directions in a pump working chamber by applying a tension force onto the piston in order to move the piston into a drive direction, wherein a pump volume in the pump working chamber is increased when the piston is moved into the drive direction, and
- counteracting against the movement of the piston into the drive direction by coupling to a side of the piston facing into pump working chamber, thus applying a tension force onto the piston in order to move the piston into a return direction opposite to the drive direction.
Dependencies are inferred from the claim text.