Internally heatshielded nozzle
DCFirst Claim
1. A fuel injector for a gas turbine engine, the fuel injector comprising:
- a fitting having a first fuel passage for receiving fuel;
a nozzle having a second fuel passage for dispensing fuel;
a housing stem extending between and interconnecting said fitting and said nozzle for i) supporting said fuel nozzle, and ii) directing fuel flow from said fitting to said nozzle, said housing stem having an internal bore defined by internal walls extending longitudinally through the stem; and
a fuel conduit disposed in the bore in said housing stem and closely surrounded by the internal walls of said housing stem, said fluid conduit having a first fixed connection with the fitting and a second fixed connection with the nozzle to fluidly interconnect the fuel passage in said fitting with the fuel passage in said nozzle, said internal bore in the housing stem being fluidly closed at the first connection to prevent fuel flowing around the fuel conduit in the bore, said fuel conduit having a coiled portion between said first and second connections to allow for thermal expansion of the fuel conduit within the bore, and said fuel conduit being spaced apart from the internal walls of the housing stem such that a stagnant air gap surrounds the fuel conduit along substantially the entire length of the fuel conduit between the fuel conduit and the housing stem.
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Litigations
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Accused Products
Abstract
A fuel injector for a gas turbine engine of an aircraft has an inlet fitting, a fuel nozzle, and a housing stem fluidly interconnecting and supporting the nozzle on the fitting. An internal heatshield assembly comprising an internal fuel conduit extends in a bore in the housing stem. An upper end of the fuel conduit has a rigid, fluid-tight connection with a fuel inlet passage in the fitting, while the lower end of the fuel conduit has a rigid, fluid-tight connection with the fuel nozzle. The bore closely surrounds the fuel conduit and a stagnant air gap is provided between the internal walls of the bore and the outer surface of the fuel conduit. The fuel conduit has a coiled portion to allow for thermal expansion.
91 Citations
26 Claims
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1. A fuel injector for a gas turbine engine, the fuel injector comprising:
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a fitting having a first fuel passage for receiving fuel;
a nozzle having a second fuel passage for dispensing fuel;
a housing stem extending between and interconnecting said fitting and said nozzle for i) supporting said fuel nozzle, and ii) directing fuel flow from said fitting to said nozzle, said housing stem having an internal bore defined by internal walls extending longitudinally through the stem; and
a fuel conduit disposed in the bore in said housing stem and closely surrounded by the internal walls of said housing stem, said fluid conduit having a first fixed connection with the fitting and a second fixed connection with the nozzle to fluidly interconnect the fuel passage in said fitting with the fuel passage in said nozzle, said internal bore in the housing stem being fluidly closed at the first connection to prevent fuel flowing around the fuel conduit in the bore, said fuel conduit having a coiled portion between said first and second connections to allow for thermal expansion of the fuel conduit within the bore, and said fuel conduit being spaced apart from the internal walls of the housing stem such that a stagnant air gap surrounds the fuel conduit along substantially the entire length of the fuel conduit between the fuel conduit and the housing stem. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A fuel injector for a gas turbine engine having a combustor casing with an opening, the fuel injector comprising:
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a fitting having a first fuel passage for receiving fuel, said fitting designed to be located exterior to the combustor casing;
a nozzle having a second fuel passage for dispensing fuel, said nozzle designed to be located within the combustor casing;
a housing stem extending through the opening in the combustor casing and between and interconnecting said fitting and said nozzle for i) supporting said fuel nozzle in the combustor casing, and ii) directing fuel flow from said fitting to said nozzle, said housing stem having an internal bore defined by internal walls extending through the stem; and
a fuel conduit disposed in the bore in said housing stem and having a first permanent, fluidly-sealed connection with the fitting and a second permanent, fluidly-sealed connection with the nozzle to fluidly interconnect the fuel passage in said fitting with the fuel passage in said nozzle, said internal bore in the housing stem being fluidly closed at the first connection to prevent fuel flowing around the fuel conduit in the bore, said fuel conduit having a structure between said first and second connections to allow for thermal expansion of the fuel conduit within the bore and said fuel conduit being spaced apart from the internal walls of the housing stem, such that a stagnant air gap surrounds said fuel conduit along substantially the entire length of the fuel conduit between the fuel conduit and the housing stem. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A fuel injection assembly for a gas turbine engine, comprising:
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a combustor casing with an opening, and a fuel injector, said fuel injector including;
a) a fitting having a first fuel passage for receiving fuel, said fitting located exterior to the combustor casing;
b) a nozzle having a second fuel passage for dispensing fuel, said nozzle located within the combustor casing;
c) a housing stem extending through the opening in the combustor casing and between and interconnecting said fitting and said nozzle for i) supporting said fuel nozzle in the combustor casing, and ii) directing fuel flow from said fitting to said nozzle, said housing stem having an internal bore defined by internal walls extending through the stem; and
a fuel conduit disposed in the bore in said housing stem and having a first permanent, fluid-tight connection with the fitting and a second permanent fluid-tight connection with the nozzle to fluidly interconnect the fuel passage in said fitting with the fuel passage in said nozzle, said internal bore in the housing stem being fluidly closed at the first connection to prevent fuel flowing around the fuel conduit in the bore, said fuel conduit having a coiled portion between said first and second connections to allow for thermal expansion of the fuel conduit within the cavity and said fuel conduit being spaced apart from the internal walls of the housing stem, such that a stagnant air gap surrounds said fuel conduit along substantially the entire length of the fuel conduit between the fuel conduit and the housing stem. - View Dependent Claims (21, 22, 23, 24, 25, 26)
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Specification