2 A FUEL VALVE AND METHOD FOR INJECTING A LIQUID FUEL INTO A COMBUSTION CHAMBER OF LARGE COMPRESSION-IGNITING TURBOCHARGED TWO-STROKE INTERNAL COMBUSTION ENGINE

摘要

The present invention relates to a fuel valve to inject liquid fuel into a combustion chamber of a large low speed turbocharged compression-igniting two-stroke internal combustion engine, capable of reliably injecting the liquid fuel, and a method thereof. According to the present invention, the fuel valve (50) comprises: an elongated valve housing (52); a nozzle (54) including an elongated nozzle body, a main bore (55), and a plurality of nozzle holes (36) connected to the main bore (55), and disposed on the front end part of the elongated valve housing (52); a fuel inlet port (53); a valve needle (61) having a closed position and an opening position; a seat (69) disposed in the elongated valve housing (52); an outlet port (68) directly connected to the main bore (55) inside the nozzle (54); a fuel chamber (58) connected to the fuel inlet port (53); a gap opened to one end part of a needle bore (64) with respect to the fuel chamber (58); a lubricant inlet port (70); a lubricant supply pipe (47) to connect the lubricant inlet port (70) to the gap of a first position (P1) along the length of the needle bore (64); an ignition liquid inlet port (67); and an ignition liquid pipe (66) extended to a chamber or the gap of a second position (P2) closer to the fuel chamber (58) from the ignition liquid inlet port (67) than the first position (P1).