US 11,913,646 B2
Fuel injector systems for torch igniters
Jason Ryon, Carlisle, IA (US); and Lev Alexander Prociw, Johnston, IA (US)
Assigned to Delavan Inc., Des Moines, IA (US)
Filed by Delavan Inc., Des Moines, IA (US)
Filed on Nov. 23, 2021, as Appl. No. 17/533,682.
Application 17/533,682 is a continuation of application No. 17/127,250, filed on Dec. 18, 2020, granted, now 11,209,164.
Prior Publication US 2022/0243916 A1, Aug. 4, 2022
Int. Cl. F23R 3/00 (2006.01); F23R 3/28 (2006.01); F02C 7/18 (2006.01); F02C 7/232 (2006.01)
CPC F23R 3/283 (2013.01) [F02C 7/18 (2013.01); F02C 7/232 (2013.01); F05D 2220/32 (2013.01); F05D 2240/35 (2013.01); F05D 2260/232 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A fuel injector system for a torch igniter, the fuel injector system comprising:
an injector body centered on an axis, wherein the injector body includes an axial wall at a first axial end of the injector body;
a receiving aperture formed in a cap of the torch igniter that receives an inner portion of the injector body at a second axial end of the injector body, the second axial end opposite the first axial end;
an injector aperture formed within the inner portion of the injector body and directly fluidly connected to an interior volume of the torch igniter;
an air inlet configured to intake a flow of air at the axial wall;
a fuel inlet configured to intake a flow of fuel at the axial wall;
an air channel disposed within the injector body and configured to channel the air from the air inlet to the injector aperture, wherein the air channel is centered on and extends along the axis;
a fuel channel disposed within the injector body and configured to channel the fuel from the fuel inlet to the injector aperture;
a receiving cavity formed in a housing of the torch igniter that receives the injector body, the receiving cavity directly fluidly connected to the receiving aperture;
a purge passage formed in the housing of the torch igniter and fluidly connected to a cooling air source, wherein the purge passage is configured to impinge cooling air from the cooling air source into the receiving cavity and onto an exterior surface of the injector body near the receiving aperture; and
wherein:
the exterior surface of the injector body is spaced a first distance from an inner surface of the receiving cavity near the purge passage; and
the exterior surface of the injector body and the inner surface of the receiving cavity define a purge channel configured to channel the cooling air from the receiving cavity to the receiving aperture and through the receiving aperture into a combustion chamber of the torch igniter.