US 12,352,217 B2
Direct control variable displacement metering pumps
Ryan Shook, Loves Park, IL (US); and Ryan Prescott Susca, Windsor, CT (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on May 26, 2023, as Appl. No. 18/202,534.
Prior Publication US 2024/0392728 A1, Nov. 28, 2024
Int. Cl. F02C 9/30 (2006.01); F04B 49/06 (2006.01); F04C 14/24 (2006.01)
CPC F02C 9/30 (2013.01) [F04B 49/06 (2013.01); F04C 14/24 (2013.01); F04C 2270/185 (2013.01); F04C 2270/585 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A system comprising:
a variable displacement pump (VDP) in fluid communication with an inlet line and with an outlet line, wherein the VDP includes a variable displacement mechanism;
an electromechanical actuator (EMA) operatively connected to actuate the variable displacement mechanism;
a flow sensing valve (FSV) connected in the outlet line, wherein the FSV includes a sensor configured to generate sensor data indicative of flow out of the outlet line;
a controller operatively connected to the EMA to control the variable displacement mechanism based on the sensor data to support flow demands from one or more downstream systems;
a minimum pressure shutoff valve (MPSOV) fluidically connected to the outlet line;
a first MPSOV line connecting the MPSOV in fluid communication with the inlet line, wherein the first MPSOV line includes a first fixed throttle;
a second MPSOV line connecting the MPSOV to the outlet line for fluid communication;
an MPSOV control line that connects the MPSOV in fluid communication with the inlet line through a second fixed throttle; and
a solenoid valve (SOL) connected in fluid communication with the outlet line and with the MPSOV control line for actuating the MPSOV between first and second states, wherein the MPSOV includes an MPSOV valve member with a first position in the MPSOV that connects the first and second MPSOV lines in fluid communication and allows flow though the outlet line, and a second position that disconnects the first and second MPSOV lines from being in fluid communication and blocks flow through the outlet line.