PURPOSE: To provide a fuel jetting nozzle, which comprises a concentric nozzle body for liquid and gaseous fuels that has a flange formed with an annular passage where a liquid fuel and a purge gas are passed to cool the nozzle to eliminate undesired influences by the thermal expantion.
CONSTITUTION: An inside of a cylindrical body 2 serves as a gaseous fuel passage, and the cylindrical body 2 has a circular flame opening 5 in a forward end surface thereof and a liquid fuel nozzle 4 supported in a center thereof by a support 3. An attachment flange 9' extending from the circumference of the body 2 constitutes of two components 9'a, 9'b. The component 9'b is formed with an inlet hole 7 and an outlet hole 8, the component 9'a is formed with a channel 14 which will communicate with the holes 7, 8 and an annular opening 15, the components 9'a, 9'b are bonded together to form the flange 9' and a cooling passage. A receiving member 16 which will cover the annular opening 15 extends between the component 9'a and the body 2 and is welded thereto. A liquid fuel and a purge gas will be supplied into the inlet hole 7 to cool the body, and leave from the outlet hole 8 to be passed into a liquid fuel supply tube 1.
OOTANI KAZUMI
KUROKAWA SUNAO
TAGUCHI YUUJI
HITACHI SERVICE ENG