Rich-lean combustion burner and combustion apparatus

摘要

In a rich-lean combustion burner, each of outer rich-side flame holes disposed on both outer sides is supplied with rich-side mixture in the same amount and mixing state as the others. A lower end part of a central rich-side burner part is projected into an interior of a tubular part to which a rich-side mixture is introduced. First communication holes are opened, respectively, in both side walls of the lower end part. A second and a third communication holes in fluid communication with an outer rich-side burner part are opened in a tubular part. The second and the third communication holes are oriented so as to face each other without any obstruction, other than a space, therebetween. Furthermore, a pocket part which is a space part adapted to collect and accumulate dust particles is formed on the downstream side up to a closed end.

主权项

1. A rich-lean combustion burner which comprises: (a) one row of central rich-side flame holes arranged such that it extends longitudinally in the middle of said rich-lean combustion burner; (b) two rows of lean-side flame holes arranged such that they sandwich therebetween said central rich-side flame hole row from both lateral sides thereof; and (c) two rows of outer rich-side flame holes arranged such that they sandwich therebetween both said two lean-side flame hole rows from the outsides thereof, wherein, for split-flow supplying of rich-side mixture from a common rich-side mixture introduction channel, the flow of rich-side mixture is split and supplied to said central rich-side flame hole row and said two outer rich-side flame hole rows,
(i) wherein a lower end part of a formation member used to form by partition a rich-side mixture supply channel for supplying of rich-side mixture to said central rich-side flame holes is disposed so as to project, as a projecting part, into the inside of said rich-side mixture introduction channel, and wherein a first communication hole for split-flow supplying of rich-side mixture to said rich-side mixture supply channel from said rich-side mixture introduction channel is formed in said projecting part, with its opening oriented to face the interior of said rich-side mixture introduction channel; (ii) wherein a second communication hole and a third communication hole for split-flow supplying of rich-side mixture to said two outer rich-side flame hole rows from said rich-side mixture introduction channel are formed in a formation member used to form by partition said rich-side mixture introduction channel, with their openings oriented to face the interior of said rich-side mixture introduction channel; and (iii) wherein said first communication hole is disposed, with its opening situated upstream, relative to the direction of the flow of rich-side mixture in the inside of said rich-side mixture introduction channel, of where said second and said third communication holes are opened.