Dual fuel injector with hydraulic lock seal and liquid leak purge strategy

摘要

A dual fuel system includes a dual fuel injector that has disposed therein a gaseous nozzle chamber fluidly connected to a gaseous fuel inlet, and a liquid nozzle chamber fluidly connected to the liquid fuel inlet. The dual fuel injector also includes a hydraulic lock seal with an annular volume of liquid fuel surrounding a guide segment of a gas needle valve member for inhibiting migration of gaseous fuel into the liquid fuel. A liquid fuel common rail is fluidly connected to a liquid fuel inlet. A check valve is fluidly positioned between the gaseous fuel common rail and the gaseous nozzle chamber of the dual fuel injector for blocking liquid fuel leaked into a gaseous nozzle chamber through the hydraulic lock seal from entering the gaseous fuel common rail.

主权项

1. A dual fuel system comprising:
a dual fuel injector defining a gaseous fuel inlet, a gaseous nozzle outlet set, a liquid fuel inlet and a liquid nozzle outlet set, and having disposed therein a gaseous nozzle chamber fluidly connected to the gaseous fuel inlet, and a liquid nozzle chamber fluidly connected to the liquid fuel inlet, and including a hydraulic lock seal with an annular volume of liquid fuel surrounding a guide segment of a gas needle valve member for inhibiting migration of gaseous fuel into the liquid fuel; a gaseous fuel common rail fluidly connected to the gaseous fuel inlet; a liquid fuel common rail fluidly connected to the liquid fuel inlet; and a check valve fluidly positioned between the gaseous fuel common rail and the gaseous nozzle chamber of the dual fuel injector for blocking liquid fuel leaked into the gaseous nozzle chamber through the hydraulic lock seal from entering the gaseous fuel common rail.