Granted Patent B2

US 10,683,829 · App. 15/780,378 · Granted Jun 16, 2020

Abstract

Claims (9)

1. A gaseous fuel injector for supplying gaseous fuel to a gaseous fuel combustion engine, the gaseous fuel injector comprising:

an injector housing adapted to receive an injector assembly and supply the gaseous fuel thereto, the injector housing having a nozzle body, an inlet at a first end, a nozzle with spray apertures at a second open end, a chamber between the inlet and the spray apertures, and an ignition arrangement at the second open end;

wherein the nozzle is adapted to comprise the ignition arrangement comprising a primary electrode thereof;

wherein the nozzle comprises an outer coating of an electrical insulator material forming an insulating ring around the nozzle body along a length of the nozzle body;

wherein the nozzle comprises a heat shield comprising a sleeve around the insulating ring; and

wherein the sleeve of the heat shield comprises a short cone section extending downwardly at the second open end of the nozzle to define a small annular cavity terminating below the insulating ring and just above the spray apertures, wherein a lower-most end of the short cone section has an inner periphery which terminates just above the spray apertures.

2. The gaseous fuel injector according to claim 1 , wherein the sleeve of the heat shield forms the primary electrode by comprising a current conducting material.

3. The gaseous fuel injector according to claim 1 , wherein the nozzle body forms the primary electrode by comprising a current conducting material.

4. The gaseous fuel injector according to claim 3 , wherein the current conducting material comprises copper and is connected to an insulated coaxial cable adapted to deliver a current thereto.

Assignments (6)