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

Claim 11:
12. A displacement pump comprising:
a 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 housing and configured to be driven along a first axis;
an electric motor configured to generate a rotational output on a second axis;
a drive connected to the electric motor and the reciprocator, the drive configured to convert the rotational output from the electric motor to a linear reciprocating motion to cause the reciprocator to reciprocate along the first axis;
a first cover at least partially defining a first process fluid cavity;
a second cover at least partially defining a second process fluid cavity, wherein the housing is disposed axially between the first cover and the second cover;
a first diaphragm at least partially defining the first process fluid cavity on a first side of the first diaphragm and at least partially defining a first chamber on a second side of the first diaphragm, the first chamber fluidly separated from the first process fluid cavity by the first diaphragm; and
a second diaphragm at least partially defining the second process fluid cavity on a first side of the second diaphragm and at least partially defining a second chamber on a second side of the second diaphragm, the second chamber fluidly separated from the second process fluid cavity by the second diaphragm;
wherein the first diaphragm and the second diaphragm are connected to the reciprocator such that the reciprocator mechanically displaces the first diaphragm through a first suction stroke and mechanically displaces the second diaphragm through a second suction stroke; and
wherein the internal pressure chamber includes the first chamber and the second chamber, and wherein the internal pressure chamber is configured such that the working fluid concurrently exerts the charge pressure on the second side of the first diaphragm and on the second side of the second diaphragm.