Patent ID: 9383097
Filing Date: 2016-07-05
CPC Classification: F02C,F23D,F23R

Claim Text:
1. A staged fuel injector comprising: a) a main fuel circuit for delivering fuel from an upstream end to a main fuel atomizer at a downstream end, the main fuel atomizer including a radially outer prefilmer and a radially inner fuel swirler, a radially inner surface of the radially outer prefilmer and a radially outer surface of the radially inner fuel swirler being joined from the upstream end to a midstream region to form said main fuel circuit and spaced apart from the midstream region to a downstream end to define walls of an annular spin chamber, wherein portions of the main fuel circuit are formed in the prefilmer and fuel exit ports associated with the main fuel circuit are formed in the prefilmer and exit into the annular spin chamber; and b) a pilot fuel circuit for delivering fuel to a pilot fuel atomizer which is located radially inward of the main fuel atomizer, wherein portions of the pilot fuel circuit are formed in the prefilmer and in the fuel swirler and are positioned proximate to and in thermal contact with the fuel exit ports and a portion of the pilot fuel circuit formed in the prefilmer is positioned downstream of the fuel exit ports in a wall of the annular spin chamber defined by the prefilmer.