US 12,281,616 B1
Single variable displacement fuel systems with fuel oil coolers
Ryan Prescott Susca, Windsor, CT (US); Sachin Ramprashad, West Hartford, CT (US); and Ryan Shook, Walla Walla, WA (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Dec. 20, 2023, as Appl. No. 18/390,229.
Int. Cl. F02C 7/236 (2006.01); F02C 7/232 (2006.01); F02C 9/30 (2006.01)
CPC F02C 7/236 (2013.01) [F02C 7/232 (2013.01); F02C 9/30 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A system comprising:
an actuation pump sub-system (APS) with an inlet configured to feed fuel from a fuel source into the APS, a first outlet configured for connecting the APS in fluid communication with an actuation system to supply fuel flow for actuation, a second outlet feeding into a supply line, and a third outlet feeding into the supply line;
a fuel oil cooler (FOC) in a first branch of the supply line, the FOC being in fluid communication to receive flow from the second outlet, wherein the APS includes a bypass valve (BPV) in a second branch of the supply line, in parallel with the FOC and in fluid communication to allow flow from the third outlet into the supply line bypassing the FOC;
an augmentor pump operatively connected to be driven by a gearbox, wherein the augmentor pump is connected in fluid communication to supply an augmentor control, wherein the APS includes a boost pump operatively connected between the inlet of the APS and the second outlet of the APS for boosting pressure of fuel from the supply to the pressure in the supply line, wherein the APS includes a variable displacement pump (VDP) with a pump inlet in fluid communication to be supplied with boosted pressure from the boost pump, and a pump outlet connected in fluid communication with the first outlet of the APS;
an augmentor selector valve (ASV) in a line connecting the pump outlet of the VDP with the outlet of the APS, wherein the ASV is connected in fluid communication with a line connecting between the augmentor pump and the augmentor control for backup supply to the augmentor control from the APS; and
a main pump and control sub-system (MPCS) with a main inlet connected in fluid communication with the supply line downstream of the BPV and FOC, and a main outlet for supplying fuel to a downstream gas generator.