US 12,253,071 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 Dec. 12, 2023, as Appl. No. 18/537,182.
Application 18/537,182 is a continuation of application No. 17/348,309, filed on Jun. 15, 2021, granted, now 11,867,165.
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 2024/0125313 A1, Apr. 18, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. F04B 43/02 (2006.01); F04B 9/02 (2006.01); F04B 9/04 (2006.01); F04B 43/04 (2006.01); F04B 53/14 (2006.01); F04B 1/14 (2020.01); F04B 9/117 (2006.01); F04B 9/137 (2006.01); F04B 17/03 (2006.01); F04B 17/04 (2006.01); F04B 27/10 (2006.01); F04B 35/01 (2006.01); F04B 35/04 (2006.01); F04B 43/06 (2006.01); F04B 45/047 (2006.01); F04B 45/053 (2006.01); F04B 53/10 (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)] 15 Claims
OG exemplary drawing
 
1. 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.