US 11,867,165 B2
Drive system for a positive displacement pump
Bradley H. Hines, Andover, MN (US); Brian W. Koehn, Minneapolis, MN (US); Jeffrey A. Earles, Lakeville, MN (US); Paul W. Scheierl, Circle Pines, MN (US); and Adam K. Collins, Brooklyn Park, MN (US)
Assigned to Graco Minnesota Inc., Minneapolis, MN (US)
Filed by Graco Minnesota Inc., Minneapolis, MN (US)
Filed on Jun. 15, 2021, as Appl. No. 17/348,309.
Application 17/348,309 is a continuation of application No. 16/204,863, filed on Nov. 29, 2018, abandoned.
Application 16/204,863 is a continuation of application No. 14/579,551, filed on Dec. 22, 2014, granted, now 10,161,393, issued on Dec. 25, 2018.
Claims priority of provisional application 62/022,263, filed on Jul. 9, 2014.
Claims priority of provisional application 61/937,266, filed on Feb. 7, 2014.
Prior Publication US 2021/0310475 A1, Oct. 7, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. F04B 43/02 (2006.01); F04B 9/02 (2006.01); F04B 43/04 (2006.01); F04B 9/04 (2006.01); F04B 53/14 (2006.01); F04B 43/06 (2006.01); F04B 17/04 (2006.01); F04B 45/053 (2006.01); F04B 9/117 (2006.01); F04B 9/137 (2006.01); F04B 17/03 (2006.01); F04B 35/04 (2006.01); F04B 53/10 (2006.01); F04B 35/01 (2006.01); F04B 45/047 (2006.01); F04B 1/14 (2020.01); F04B 27/10 (2006.01)
CPC F04B 43/025 (2013.01) [F04B 9/02 (2013.01); F04B 9/042 (2013.01); F04B 43/04 (2013.01); F04B 53/14 (2013.01); F04B 1/14 (2013.01); F04B 9/1176 (2013.01); F04B 9/1376 (2013.01); F04B 17/03 (2013.01); F04B 17/044 (2013.01); F04B 27/10 (2013.01); F04B 35/01 (2013.01); F04B 35/04 (2013.01); F04B 43/06 (2013.01); F04B 45/047 (2013.01); F04B 45/053 (2013.01); F04B 53/10 (2013.01); F04B 53/1002 (2013.01)] 20 Claims
OG exemplary drawing
 
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.