PURPOSE: To provide the titled passage structure wherein the interior structure of a nozzle part is simplified, constituted of such a structure that a common manifold is provided to three pipes in the nozzle having a burner provided to the leading end thereof and three passages provided to this manifold is connected to the jet orifice of the burner.
CONSTITUTION: In the nozzle passage structure of a lance, a firstWthird pipes (a powder pipe leading end part P, an O2-pipe leading end part O and oil pipe leading end par L) and a manifold 55 common to each pipe are provided in a nozzle 13 having a burner 67 provided to the leading end thereof. In this case, a first pipe is connected to the first distribution passage (pipe 61) in the manifold 55 through a first header 54 and a second pipe is connected to the second distribution passage 62 in the manifold 55 through a second header 51 surrounding the first header 54 while a third pipe is connected to the third passage 59 in the manifold 55 and the above mentioned three pipes are connected to the jet orifice of the burner 67. That is, because the header 54 is contained in the header 51, the total exclusive space the headers occupy can be reduced and the nozzle part 13 can be miniaturized and simplified.
ISHIMATSU HIROYUKI
MATSUOKA KENJI
NIPPON ALUMINIUM MFG