Patent ID: 9638422
Date: 2017-05-02
CPC Classifications: B05B,F02C,F02M,F23R

Claim:
1. A fuel injector for a gas turbine engine, comprising: an injector body having a feed arm with a nozzle body connected thereto, the feed arm having a feed arm wall bounding a cavity within the feed arm and supporting the nozzle body; a single-piece fuel conduit disposed within the feed arm cavity and fluidly connecting a fuel inlet portion of the feed arm to a fuel circuit in the nozzle body to form a fuel path through the injector body; a feed arm insulative gap bounded by an outer surface of the single-piece fuel conduit and an interior surface of the feed arm wall to thermally insulate the fuel path of the injector body; an aperture formed through the feed arm wall and in fluid communication with an outlet of the nozzle body through the feed arm insulative gap that provides fluid communication between the feed arm insulative gap and ambient conditions existing on an outside of the feed arm wall; a nozzle body insulative gap disposed radially outward of the fuel circuit in the nozzle body and extending about the fuel circuit in the nozzle body, the nozzle body insulative gap being in fluid communication with the feed arm insulative gap; a helical passage disposed within the feed arm insulative gap with an inlet and an outlet, the aperture being in fluid communication with the feed arm insulative gap serially through both the inlet and the outlet of the helical passage; and a reed valve disposed within the insulative gap and fluidly interposed between the outlet of the helical passage and the feed arm insulative gap, wherein the outlet of the helical passage is disposed axially along the feed arm on a side of the aperture opposite the nozzle body to promote fuel coking within the helical passage.