| 摘要 |
PROBLEM TO BE SOLVED: To provide a piloted rich-lean combustion burner that is not influenced by a positional deviation between a fuel gas injection nozzle and a burner unit to enable mixture gas to be equally distributed to the right and left piloted ports and a length of rich mixture gas feeding pipe to be made short.SOLUTION: There is provided an introduction pipe part 11 formed with an inlet 10 for supplying mixture to a second burner 5 and having its discharge side connected to upstream side inlets of the right and left distribution pipes 13, 13. The introduction pipe part 11 is provided with a pipe-shaped narrow part 17 for converging flux of flowing mixture stream in such a way that a flux width win respect to an axis y perpendicular to a pipe central axis x of the introduction pipe part 11 may be narrowed, upstream side inlets of the right and left distribution pipe parts 13, 13 are arranged in plane symmetry around a plane including the pipe central axis x of the pipe-shaped narrow part 17 while the direction of width axis y where the flow flux width wof mixture flow is narrowed at the narrow part 17 is defined as a normal direction and a plane including the pipe central axis x of the narrow part 17 is defined as a symmetry plane S. |
