Rich-lean combustion burner

摘要

A row of rich-side flame holes is centrally arranged. Two rows of lean-side flame holes are arranged on both sides of the rich-side flame hole row, respectively. In addition, two rows of rich-side flame holes are arranged on the outsides of the two lean-side flame hole rows, respectively. A lower end part of a central rich-side burner part is projected into a tubular part into which the rich-side mixture is introduced, and communication holes in fluid communication with an inner space are formed in walls on both sides so as to pass completely therethrough in alignment with each other. Each communication hole has a larger diameter than an inner width P and is disposed at a potion situated nearer to the upper of the tubular part and nearer to the front so as to leave, at the rear, a space in which dust p particles are accumulated.

主权项

1. A rich-lean combustion burner comprising two rows of lean-side flame holes disposed so as to sandwich, therebetween and from both lateral sides, one row of central rich-side flame holes disposed so as to longitudinally extend in a central position and two rows of outer rich-side flame holes disposed so as to sandwich, therebetween and from outside, both said two rows of lean-side flame holes,
wherein a flow of a rich-side mixture introduced into a single rich-side mixture introduction channel is diverged from said single rich-side mixture introduction channel, whereby said rich-side mixture is distributed to said one row of central rich-side flame holes and to said two rows of outer rich-side flame holes, wherein a first supply channel for supply of said rich-side mixture to said one row of central rich-side flame holes, a second supply channel and a third supply channel for individual supply of said rich-side mixture to each of said two rows of outer rich-side flame holes and said rich-side mixture introduction channel are partitioned from one another, wherein a first portion of a formation member for partition formation of said first supply channel is disposed so as to project into said rich-side mixture introduction channel and wherein a pair of facially-opposing first communication holes is formed in said projecting first portion of said formation member facilitating fluid communication of the rich-side mixture from said rich-side mixture introduction channel and into the first supply channel, and wherein a second communication hole and a third communication hole are formed in respective ones of second and third portions of the formation member so that the second communication hole facilitates fluid communication of the rich-side mixture from said rich-side mixture introduction channel into the second supply channel and the third communication hole facilitates fluid communication of the rich-side mixture from the rich-side mixture introduction channel into the third supply channel.