US 12,253,029 B2
Fuel system for dual use gas turbine engine main fuel pump
Eric Briggs, Indian Trail, NC (US); and Naison E. Mastrocola, Goshen, CT (US)
Assigned to Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed by Hamilton Sundstrand Corporation, Charlotte, NC (US)
Filed on Aug. 7, 2023, as Appl. No. 18/230,805.
Prior Publication US 2025/0052199 A1, Feb. 13, 2025
Int. Cl. F02C 7/236 (2006.01); F02C 7/26 (2006.01); F02C 9/26 (2006.01)
CPC F02C 7/236 (2013.01) [F02C 7/26 (2013.01); F02C 9/263 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A system comprising:
a main pump having a main pump shaft configured to connect to a gear box for driving the main pump with rotational power from the gear box in a run mode, and for driving the gear box with rotational power from the main pump in a start mode;
a first fuel line with an inlet configured to be connected in fluid communication with a fuel source, wherein the first fuel line includes a first branch in fluid communication with the main pump, and a second branch;
a start pump connected in fluid communication with the second branch of the first fuel line;
a second fuel line connecting the start pump in fluid communication with a pump management valve (PMV); and
a third fuel line connecting the main pump in fluid communication with the pump management valve; and
an electric machine configured to drive the start pump in the start mode, and wherein the electric machine is configured to be driven by the start pump in the run mode for generating electrical power from bypass flow of the main pump.