Rich-lean combustion burner and combustion apparatus

摘要

There is provided a flame hole formation member 7 which is inserted and mounted from above in a third plate member 6 used to form a central rich-side flame hole row 33. As the flame hole formation member 7, a pair of flame hole formation parts 71, 71 each used to form a respective lean-side flame hole row 34 are connected by bridge formation parts 72, 72 at their upper end positions, with a predetermined distance held between the flame hole formation parts 71, 71. The bridge formation part 72, 72 is fitted from above into an engagement groove 332 formed in the upper end edge of the third plate member 6, whereby the pair of the flame hole formation parts 71, 71 are assembled so as to sit astride the upper end edge of the third plate member 6.

主权项

1. A rich-lean combustion burner, comprising: a) central rich-side flame holes arranged in one row and extending in the longitudinal direction in the middle relative to the lateral direction, b) lean-side flame holes arranged in two rows sandwiching said central rich-side flame hole row therebetween from both sides relative to the lateral direction and c) outer rich-side flame holes arranged in two rows sandwiching said two lean-side flame hole rows on both sides therebetween from outside, wherein a flame hole formation member forms said lean-side flame holes of said two lean-side flame hole rows, said flame hole formation member being inserted and mounted from above in a formation member forming said central rich-side flame holes, and
wherein said flame hole formation member comprises: i) a pair of flame hole formation parts forming said lean-side flame holes of each of said two lean-side flame hole rows and ii) at least one or more bridge formation parts connecting respective upper end portions or respective side end portions of said pair of said flame hole formation parts, and wherein said pair of said flame hole formation parts are held integrally with each other by said bridge formation part in such a state that said pair of said flame hole formation parts are oriented face-to-face with each other and spaced apart at an interval of a predetermined distance so as to sandwich therebetween said formation member forming said central rich-side flame holes from both sides relative to the lateral direction.