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US 12,253,071 B2Granted
Drive system for a positive displacement pump
AssigneeGraco Minnesota Inc.
InventorsBradley H. Hines, Brian W. Koehn, Jeffrey A. Earles, Paul W. Scheierl, Adam K. Collins
Life of this patent
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Abstract
A drive system for a pump includes a housing and a fluid displacer and a reciprocator configured to mechanically displace the fluid displacer through respective suction strokes. The housing and fluid displacer define an internal pressure chamber configured to be filled with a working fluid having a charge pressure. The internal pressure chamber is configured such that the working fluid exerts the charge pressure on the fluid displacer during both the suction stroke and a pressure stroke of the fluid displacer.
Claims15
A displacement pump comprising:
- a first housing at least partially defining an internal pressure chamber configured to be filled with a working fluid charged to a charge pressure, the working fluid being one of a compressed gas and a non-compressible hydraulic fluid under pressure;
- a reciprocator disposed within the first housing and configured to be driven along a first axis;
- a first diaphragm disposed at a first end of the first housing, the first diaphragm at least partially defining the internal pressure chamber;
- wherein the reciprocator is connected to the first diaphragm to mechanically displace the first diaphragm through a first suction stroke;
- wherein the internal pressure chamber is configured such that the working fluid exerts the charge pressure on the first diaphragm during both the first suction stroke and during a first pressure stroke of the first diaphragm, wherein the first diaphragm is configured to shift in a first direction along the first axis to increase a volume of a first process fluid chamber through which the process fluid is pumped by the first diaphragm during the first suction stroke, and wherein the first diaphragm is configured to shift in a second direction along the first axis to decrease a volume of the first process fluid chamber during the first pressure stroke;
- and
- an electric drive operably connected to the reciprocator to drive reciprocation of the reciprocator along the first axis.
4 more elements
A displacement pump comprising:
- a first housing at least partially defining an internal pressure chamber configured to be filled with a working fluid charged to a charge pressure, the working fluid being one of a compressed gas and a non-compressible hydraulic fluid under pressure;
- a reciprocator disposed within the first housing and configured to be driven along a first axis;
- a first diaphragm disposed at a first end of the first housing, the first diaphragm at least partially defining the internal pressure chamber;
- wherein the reciprocator is connected to the first diaphragm to mechanically displace the first diaphragm through a first suction stroke;
- wherein the internal pressure chamber is configured such that the working fluid exerts the charge pressure on the first diaphragm during both the first suction stroke and during a first pressure stroke of the first diaphragm, wherein the first diaphragm is configured to shift in a first direction along the first axis to increase a volume of a first process fluid chamber through which the process fluid is pumped by the first diaphragm during the first suction stroke, and wherein the first diaphragm is configured to shift in a second direction along the first axis to decrease a volume of the first process fluid chamber during the first pressure stroke;
- and
- wherein the internal pressure chamber is configured to be filled with the working fluid throughout both the first pressure stroke and the first suction stroke without the working fluid being exhausted from the internal pressure chamber.
4 more elements
A displacement pump comprising:
- a first housing at least partially defining an internal pressure chamber configured to be filled with a working fluid charged to a charge pressure, the working fluid being one of a compressed gas and a non-compressible hydraulic fluid under pressure;
- a reciprocator disposed within the first housing and configured to be driven along a first axis;
- a first diaphragm disposed at a first end of the first housing, the first diaphragm at least partially defining the internal pressure chamber;
- wherein the reciprocator is connected to the first diaphragm to mechanically displace the first diaphragm through a first suction stroke;
- wherein the internal pressure chamber is configured such that the working fluid exerts the charge pressure on the first diaphragm during both the first suction stroke and during a first pressure stroke of the first diaphragm, wherein the first diaphragm is configured to shift in a first direction along the first axis to increase a volume of a first process fluid chamber through which the process fluid is pumped by the first diaphragm during the first suction stroke, and wherein the first diaphragm is configured to shift in a second direction along the first axis to decrease a volume of the first process fluid chamber during the first pressure stroke;
- and
- a second diaphragm disposed at a second end of the first housing, the second diaphragm at least partially defining the internal pressure chamber;
- wherein the reciprocator is connected to the second diaphragm to mechanically displace the second diaphragm through a second suction stroke.
5 more elements
Dependencies are inferred from the claim text.