Internally heatshielded nozzle

  • US 6,276,141 B1
  • Filed: 11/12/1999
  • Issued: 08/21/2001
  • Est. Priority Date: 03/13/1996
  • Status: Expired due to Term
First Claim
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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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