Patent ID: 11970976
Assignee: HAMILTON SUNDSTRAND CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A fuel injector for a turbine engine comprising:
a housing having an internal enclosure for pressurized fluid;
a fuel inlet formed on the housing, permitting delivery of a fuel supply to the fuel injector;
a scheduling valve disposed within the housing, configured for regulation of fuel flow from the fuel inlet in response to fuel pressure received at the fuel inlet;
a primary fuel circuit formed in the housing, receiving fuel from the scheduling valve;
a secondary fuel circuit formed in the housing, receiving fuel from the scheduling valve;
an auxiliary fuel circuit formed in the housing, receiving fuel from the scheduling valve;
an electrically-controlled valve in fluid communication with the auxiliary fuel circuit, adapted and configured to actively control fuel through the auxiliary fuel circuit in response to a control signal;
a fuel nozzle in fluid communication with and receiving fuel from the primary, secondary and auxiliary fuel circuits;
a primary outlet formed on the nozzle, in fluid communication with the primary fuel circuit;
a secondary outlet formed on the nozzle, in fluid communication with the secondary fuel circuit; and
an auxiliary outlet formed on the nozzle, in fluid communication with the auxiliary fuel circuit,
wherein the scheduling valve includes a valve spool, biased to a closed position by one or more biasing members, wherein the valve spool is configured to regulate flow from the inlet of the injector to each of the primary and secondary circuits, and wherein the valve spool includes a scheduling surface configured to vary flow area through the secondary circuit based on position of the valve spool within the scheduling valve.