Combustion apparatus

Abstract

A combustion apparatus has: a combustion housing; a partition plate provided in the combustion housing to partition a space in the combustion housing into a combustion chamber and an air supply chamber; and a plurality of rich-lean burners arranged in a right-left direction of the combustion chamber. A multiplicity of distributed holes are formed in the partition plate through which distributed holes secondary air is supplied from the air supply chamber to the combustion chamber. A flame rod facing to an upper side of a part of the rich-lean burners stops combustion when the flame rod does not detect any flames owing to a flame lift at a time of an oxygen deficiency. A supply quantity of the secondary air to the part of the rich-lean burners to which part the flame rod faces is larger than those to other parts.

1 . A combustion apparatus, comprising:
 a combustion housing;   a partition plate provided in the combustion housing to partition a space in the combustion housing into a combustion chamber and an air supply chamber on a lower side of the combustion chamber;   a plurality of rich-lean burners arranged in a right-left direction of the combustion chamber, each of the rich-lean burners including a burner main body elongated in a front-rear direction thereof, a lean flame port jetting out a lean mixture gas of a fuel concentration leaner than a theoretical air fuel ratio, and a couple of rich flame ports situated on both sides of the lean flame port in a right-left direction thereof to jet out a rich mixture gas of a fuel concentration richer than that of the lean mixture gas, the lean flame port and the rich flame ports situated at an upper end of the burner main body;   a multiplicity of distributed holes formed in the partition plate through which distributed holes secondary air is supplied from the air supply chamber to the combustion chamber;   a flame rod facing to an upper side of a part of the rich-lean burners to stop combustion when the flame rod does not detect any flames owing to a flame lift at a time of an oxygen deficiency,   wherein a supply quantity of the secondary air to the part of the rich-lean burners to which part the flame rod faces is larger than those to other parts.   
     
     
         2 . The combustion apparatus according to  claim 1 , wherein the distributed holes in a part of the partition plate through which part the secondary air to flow to the part of the rich-lean burners to which part the flame rod faces passes are formed to have an opening area of the distributed holes per unit area of the partition plate larger than those of other parts.