US 12,345,203 B2
Direct controlled variable displacement pump fuel systems with low pressure thermal recirculation pumping
Ryan Prescott Susca, Windsor, CT (US); and Ryan Shook, Loves Park, IL (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Jun. 12, 2023, as Appl. No. 18/208,451.
Prior Publication US 2024/0410358 A1, Dec. 12, 2024
Int. Cl. F02C 7/22 (2006.01); F02C 7/236 (2006.01); F04B 49/12 (2006.01)
CPC F02C 7/22 (2013.01) [F02C 7/236 (2013.01); F04B 49/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system comprising:
a main supply line;
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 configured to vary pressure to the outlet line, wherein the inlet line is in fluid communication to receive flow for the VDP from the main supply line;
an actuator operatively connected for direct control of the variable displacement mechanism;
a pressure sensor operatively connected to the outlet line to generate feedback indicative of pressure in the outlet line;
a controller operatively connected to receive the feedback from the pressure sensor, and operatively connected to the actuator to control the variable displacement mechanism based on the feedback;
an actuation system in fluid communication to be supplied with fluid from the outlet line for use in hydraulic actuation, wherein the actuation system includes an actuation return line connecting the actuation system in fluid communication to return fluid to the main supply line;
a boost pump connected in fluid communication between a supply and the main supply line upstream of the inlet line for supplying the VDP and one or more gas generator systems supplied by the main supply line; and
a wash screen in the inlet line configured to filter flow entering the inlet line through a screen, and configured to wash the screen with flow through the main supply line.