Patent ID: 11867165
Assignee: GRACO MINNESOTA INC.
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A drive system for a displacement pump, the drive system comprising:
a first housing at least partially defining an internal pressure chamber configured to be filled with a working fluid having 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;
an electric displacer operably connected to the reciprocator to drive reciprocation of the reciprocator along the 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;
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 first diaphragm and the second diaphragm to mechanically displace the first diaphragm through a first suction stroke and to mechanically displace the second diaphragm through a second suction stroke;
wherein the internal pressure chamber is configured such that the working fluid exerts the charge pressure on the first diaphragm and on the second diaphragm during both a first pressure stroke of the first diaphragm and a second pressure stroke of the second diaphragm.