Rinnai Corporation

Tadayuki Hiraga

Hideo Okamoto

Hiroaki Sasaki

Mineyuki Nasu

Hiroitsu Ohta

A tubular burner includes: a mixing tube having an inlet port into which a fuel gas and primary air flow; and a flame hole member having a plurality of flame holes and being fitted into a front end portion of the mixing tube. The flame holes of the flame hole member are made up of a central main flame hole and a plurality of subsidiary flame holes positioned around, and each being smaller than, the central main flame hole. In an annular region of the flame hole member defined between an outer periphery of the flame hole member and the central main flame hole, a plurality of non-flame-hole regions which are free from formation of the subsidiary flame holes are provided at a circumferential distance from one another. The plurality of the subsidiary flame holes are formed in each of flame hole regions defined between the non-flame-hole regions.

Tubular burner

A combustion device has tubular burners with mixing tubes made by joining together two plate members which have formed therein half-split mixing tubes at a distance from one another and which, when joined together, form a clearance serving as a carryover flame hole to communicate a mixing tube with an adjoining mixing tube. An intermediate flame hole portion is formed by recessing backward the front end of the carryover flame hole. A cover portion is formed in each of the two plate members so as to lie opposite to each other with a recessed space lying therebetween. The recessed space is defined as a space that is generated between the intermediate flame hole portion and a line that is drawn in front of the intermediate flame hole portion along the same longitudinal direction as the front end, except for the part of the intermediate flame hole portion.

Combustion device

A single can-type composite heat source machine including a single can body including a first combustion section having a first burner and a hot water supplying first main heat exchanger located above the first burner, and a second combustion section having a second burner and a second main heat exchanger located above the second burner and used for a purpose other than hot water supply. The first combustion section and the second combustion section are partitioned from each other by a partition wall and juxtaposed in a lateral direction. The machine includes a first auxiliary heat exchanger and a second auxiliary heat exchanger both of a latent heat recovery type connected to upstream sides of the first main heat exchanger and the second main heat exchanger, respectively. An exhaust system can be miniaturized and simplified in spite of provision of the auxiliary heat exchangers.

Growing community of inventors

Nagoya, Japan

Tadayuki Hiraga