| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rich-lean flame burner capable of equalizing, in particular, a mixed state and a supply amount of rich mixed air supplied to rich flame holes located at positions at both external sides when dividing and supplying the rich mixed air to the rich flame holes at three positions of a center position from a common rich mixed air introduction passage and positions at both external sides. <P>SOLUTION: There are sequentially aligned rich flame holes of a center rich burner in the center, lean flame holes of lean burners at both sides, and rich flame holes of external rich burners at both external sides. A lower end 60a of the center rich burner is protruded to a cylinder 38 into which the rich mixed air is introduced, and first communication holes 61, 61 are formed at both sidewalls. Second and third communication holes 41, 41 communicating with an external rich burner are formed at the cylinder 38 located at the downstream side, and the second and third communication holes 41, 41 are arranged while they face each other via only a space without interposing anything for blocking them between them. <P>COPYRIGHT: (C)2013,JPO&INPIT |
