A leaf spring nozzle flow control which is positioned in the nozzle body controls the flow of fluid to a fixed restriction nozzle such that the flow varies substantially in direct linear relationship with the pressure of the fluid. The flow control includes a plate having a plurality of leaf spring valves which are biased by the fluid pressure from a first position in which flow to the nozzle is blocked to a second position in which the fluid flows to the nozzle when the pressure of the fluid exceeds a predetermined minimum magnitude as determined by the leaf spring.
A dual orifice fuel nozzle characterized in the provision of a pressure responsive flow modulating member in the primary fuel supply passage upstream of the spin passages and spin chamber of the primary discharge orifice, said member being operative in response to increasing primary fuel pressure to decrease the flow through the primary discharge orifice and to increase the angle of the fuel spray pattern therefrom once engine ignition and/or some low power condition is reached.
The airblast fuel injector capable of accommodating high fuel temperature at the injector tip without deleterious fuel vaporization problems and resultant combustion instability in a gas turbine engine includes an annular spring valve mounted on an annular shoulder of an inner injector body forming an inner air chamber with the valve having a cantilever valve head for controlling fuel flow from a fuel swirling orifice in the shoulder near the injector tip. The spring bias of the cantilever valve head is adjusted by lapping the valve head prior to fastening the spring valve to the inner injector body and before the inner injector body is assembled within an outer injector body having means forming an outer annual fuel chamber and air chamber. The method involves valving the fuel flow in the injector tip near to the fuel discharge orifice in a valve closed manner below a selected minimum fuel pressure and in a valve metering manner above the selected fuel pressure with valving located sufficiently upstream therefrom that the airblast operational characteristics of the injector are not adversely affected.
The airblast fuel injector capable of accommodating high fuel temperature at the injector tip without deleterious fuel vaporization problems and resultant combustion instability in a gas turbine engine includes an annular spring valve mounted on an annular shoulder of an inner injector body forming an inner air chamber with the valve having a cantilever valve head for controlling fuel flow from a fuel swirling orifice in the shoulder near the injector tip. The spring bias of the cantilever valve head is adjusted by lapping the valve head prior to fastening the spring valve to the inner injector body and before the inner injector body is assembled within an outer injector body having means forming an outer annual fuel chamber and air chamber. The method involves valving the fuel flow in the injector tip near to the fuel discharge orifice in a valve closed manner below a selected minimum fuel pressure and in a valve metering manner above the selected fuel pressure with valving located sufficiently upstream therefrom that the airblast operational characteristics of the injector are not adversely affected.
An airblast fuel injector tip is provided for reducing fuel vaporization problems as a result of high fuel temperatures without adversely affecting the airblast operational characteristics of the injector tip. The injector tip includes a fuel receiving chamber and an arcuate valve member movable relative to a valve seat member having a fuel discharged port for discharging fuel flow into the fuel receiving chamber as metered by said valve member in dependence on the pressure of fuel. The valve member comprises an arcuate reed-type valve received in a generally cylindrical tubular valve seat insert with the flow area of the fuel discharge port adjustable externally of the valve seat insert for adjusting the valve cracking pressure.
5174504 - Airblast fuel injector - Owned by Fuel Systems Textron, Inc. (Walled Lake, MI) [*] Notice:The portion of the term of this patent subsequent to May 14, 2008 has been disclaimed.
An airblast fuel injector tip is provided for reducing fuel vaporization problems as a result of high fuel temperatures without adversely affecting the airblast operational characteristics of the injector tip. The injector tip includes a fuel receiving chamber and an arcuate valve member movable relative to a valve seat member having a fuel discharge port for discharging fuel flow into the fuel receiving chamber as metered by said valve member in dependence on the pressure of fuel. The valve member comprises an arcuate reed-type valve received in a generally cylindrical tubular valve seat insert with the flow area of the fuel discharge port adjustable externally of the valve seat insert for adjusting the valve cracking pressure.
