Fuel valve for injecting fuel into the combustion chamber of an internal combustion engine

Abstract

A fuel valve (50) for injecting e.g. a low flashpoint liquid fuel into the combustion chamber of a large slow running two-stroke turbocharged self-igniting internal combustion engine. The fuel valve (50) comprises an elongated fuel valve housing (52), a nozzle (54) with a closed tip (59) and a hollow interior that forms a chamber (55) connected to nozzle holes (56), a fuel inlet port (53) for connection to a source (60) of pressurized liquid fuel, an actuation liquid port (92), a pump piston (80) received in a first bore (81) with a pump chamber (82) in the first bore (81) on one side of the pump piston (80), an actuation piston (83) received in a second bore (84) in the valve housing (52) with an actuation chamber (85) in the second bore (84) on one side of the actuation piston (83), the pump piston (80) being connected to the actuation piston (83) to move in unison therewith, the actuation chamber (85) being connected to the actuation liquid port (92), a valve member with an axially displaceable shaft (67) that is received in a longitudinal bore (77), the valve member having a closed position and an open position, the axially displaceable shaft (67) is provided with a closure member (65) that rests on a valve seat (69) in the closed position and has lift from the valve seat (69) in the open position and the axially displaceable shaft (67) is biased towards the closed position by a spring (66), a conduit (57, 77) between the pump chamber (82) and the valve seat (69), the valve seat faces the chamber (55) in the nozzle (54), and the closure member (65) is at least partially disposed in the chamber (55) in the nozzle (54).

Description

technical field [0001] The present invention relates to a fuel valve for injecting liquid fuel into the combustion chamber of a large low speed unidirectional flow turbocharged two-stroke internal combustion engine. Background technique [0002] Large low-speed turbocharged two-stroke self-ignition internal combustion engines of the crosshead type are commonly used in the propulsion systems of large ships or as prime movers in power plants. These engines are often run on heavy fuel oil. [0003] Recently, there is a need for large turbocharged two-stroke self-ignition internal combustion engines capable of operating on alternative fuels such as gas, methanol, coal slurry, petroleum coke, and the like. Low flash point fuels are a group of fuels that are in increasing demand. [0004] Many low flash point fuels such as methanol, LPG, DME or biofuels are relatively clean fuels when used as fuel for large low speed unidirectional flow turbocharged two-stroke self-ignition inte...

AI Technical Summary

Problems solved by technology

Thus, in the case of a dual fuel system, there would be three low flash point fuel valves and three fuel valves per cylinder, and therefore, the head space of the cylinders would be congested

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