Fuel valve for a large-sized turbocharged compression ignition two-stroke internal combustion engine, an internal combustion engine using the same, and a method of operating the engine

摘要

A fuel valve (50) for injecting liquid fuel into the combustion chamber of a large slow running two-stroke turbocharged compression-igniting internal combustion engine, comprising an elongated valve housing (52) with a rear end and a front end, a nozzle (54) comprising an elongated nozzle body extending from a base (46) to a closed tip (59), a main bore (55) extending from the base (46) to the closed tip (59) and a plurality of nozzle holes (56) connected to the main bore (55), the nozzle (54) being disposed at the front end of the elongated valve housing (52) with the base (46) connected to the front end, a fuel inlet port (53) in the elongated fuel valve housing (52) for connection to a source (60) of pressurized liquid fuel, an axially displaceable valve needle (61) slidably received in a longitudinal needle bore (64) in the elongated valve housing (52) with a clearance between the valve needle (61) and the needle bore (64), the valve needle (61) having a closed position and an open position, the valve needle (61) rests on a valve seat (69) in the closed position and the valve needle (61) has lift from the valve seat (69) in the open position and the valve needle (61) being biased towards the closed position, the seat (69) being disposed in the elongated valve housing (52) between a fuel chamber (58) in the valve housing (52) and an outlet port (68) in the front end of the elongated valve housing (52), the outlet port (68) connecting directly to the main bore (55) in the nozzle (54), the fuel chamber (58) being connected to the fuel inlet port (53), the clearance opening at one end of the needle bore (64) to the fuel chamber (58), a lubricating oil inlet port (70) for connection to a source of pressurized lubricating oil (57), a lubricating oil supply conduit (47) connecting the lubricating oil inlet port (70) to the clearance at a first position (P1) along the length of the needle bore (64), an ignition liquid inlet port (67) for connection to a source of pressurized ignition liquid (65), and an ignition liquid conduit (66) extending from the ignition liquid inlet port (67) to the chamber (58) or to the clearance at a second position (P2) along the length of the needle bore (64) that is closer to the fuel chamber (58) than the first position (P1).