US 12,366,207 B2
Variable displacement pump (VDP) systems with dry-out centrifugal main pump
Ryan Shook, Walla Walla, WA (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 Sep. 11, 2023, as Appl. No. 18/244,425.
Prior Publication US 2025/0084795 A1, Mar. 13, 2025
This patent is subject to a terminal disclaimer.
Int. Cl. F02C 7/236 (2006.01); F02C 7/232 (2006.01); F04B 23/14 (2006.01)
CPC F02C 7/236 (2013.01) [F02C 7/232 (2013.01); F04B 23/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A fuel system comprising:
a main fuel pump sub-system (MFP) with an inlet for receiving a supply of fuel from an inlet line, wherein the MFP has a main outlet line configured to supply fuel to a main fuel throttle valve assembly (MFTV), and a cross-over outlet line; and
a variable displacement pump sub-system (VDPP) with a first inlet connected in fluid communication with the cross-over outlet line, a second inlet connected to a branch of the main outlet line, a first outlet line configured to connect to supply fuel to the MFTV, and a second outlet line configured to connect to supply fuel to an actuation system;
wherein the MFTV includes an MFTV check valve (MFTV CV) connected in fluid communication between the main outlet line and the first outlet line of the VDPP, configured to prevent flow from the main outlet line to the first outlet line of the VDPP, and to allow flow from the first outlet line of the VDPP to the main outlet line; and
wherein the MFTV includes a selector valve (MFTV SV) connected in fluid communication with the first outlet line of the VDPP, with the branch of the main outlet line upstream of the MFTV CV, and with an engine line, wherein the MFTV SV is configured to select between the main outlet line and the first outlet line of the VDPP to supply fuel from the MFTV to the engine line.