Noritz Corporation

Takashi Akiyama

Itsuo Nagai

Ryosuke Umakoshi

Yasutaka Kuriyama

Takeshi Wakada

Norihide Wada

Keigo Fukunishi

Toshio Watanabe

Takashi Hasegawa

Shuji Kameyama

Masahiro Iguchi

Koji Shimomura

Hidenori Hata

Masaaki Matsuda

Shingo Kimura

Yasuhiko Sato

Tatsuya Karaki

Keiichi Miura

Naoki Se

Hiroki Hasegawa

Taihei Terasawa

Shigeo Sugie

Kenichi Sakurai

Yoshinori Kanda

Takao Morigaki

Takashi Wakatake

Koji Ota

Masahiko Shimazu

Toshikazu Miki

Provided is a water heater including a burner that receives a supply of combustion air from a fan, a heat exchanger having a heat transfer tube, and a combustion chamber case in which a combustion chamber of the burner is formed in the interior thereof and which is to be capable of guiding combustion gas generated by the burner to the heat exchanger. The water heater further includes a unit case that surrounds the combustion chamber case, and a region on the outside of the combustion chamber case within the unit case serves as an air pressure chamber having a higher pressure than the combustion chamber. Thus, combustion gas leakage to the outside can be prevented or suppressed appropriately by means of a simple configuration.

Water heater

A burner case and a burner device provided with the burner case are disclosed. A cover for closing an opening of a case body of the burner case is attached to the case body by a first caulking portion and a second caulking portion. A first caulking direction and a second caulking direction intersect with each other, the first caulking direction is a direction in which a first attachment piece and a first facing portion, those constituting the first caulking portion, face each other and are caulked, the second caulking direction is a direction in which a second attachment piece and a second facing portion, those constituting the second caulking portion, face each other and are caulked. Thus, the case body and the cover are not required to be screwed or the number of the screws is reduced, and leakage of gas from the burner case to outside is prevented.

Burner case and burner device provided with the burner case

There is provided a flame hole formation memberwhich is inserted and mounted from above in a third plate memberused to form a central rich-side flame hole row. As the flame hole formation member, a pair of flame hole formation partseach used to form a respective lean-side flame hole roware connected by bridge formation partsat their upper end positions, with a predetermined distance held between the flame hole formation parts. The bridge formation partis fitted from above into an engagement grooveformed in the upper end edge of the third plate member, whereby the pair of the flame hole formation partsare assembled so as to sit astride the upper end edge of the third plate member

Rich-lean combustion burner and combustion apparatus

A rich-lean combustion burner has a supply channel through which a lean-side mixture is supplied to lean-side flame holes; and a supply channel through which a rich-side mixture is supplied to rich-side flame holes. The supply channels are partitioned from each other. A third plate member including a pair of plate parts which are bent to form a V shape at its lower end edge as a fold line is employed to form a central rich-side burner part. A slit part is partitioned and formed between side edges of a pair of first plate members on both longitudinal sides for forming lean-side flame holes on width-wise sides of the central rich-side burner part. With the lower end part in front, the V-shaped third plate member s inserted into the slit part, thereby being interposed between the first plate members.

Rich-lean combustion burner

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.

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.

Burner

A combustion apparatusincludes a plurality of burners, a plurality of fuel supply channels, a blower, an air supply passage, and a pressure regulator. The burnersare divided into a plurality of burner groups. The pressure regulatoris branched at a portion located immediately after a gas outletat downstream of the regulatorand connected to the respective fuel supply channels, so as to regulate gas supplied at a primary pressure to gas at a secondary pressure in response to a predetermined signal pressure sensed from one selected from a part of the air supply passageand the blowerand to discharge the regulated gas through the pressure regulator. The fuel supply channelseach are configured to perform fuel supply to the respective burner groupsand are provided with a switching valvefor either shutting off or reducing the fuel supply to at least a part of the burner groups

Combustion apparatus

Portion of a burner

A combustion apparatus ( ) is generally composed of a principal part ( ), a supplementary part ( ) and a burner port assembly ( ). Four metal plates ( ) constituting the principal and supplementary parts ( ) are pressed to have in them several protuberances and recesses. These metal plates are laid one on another to form in them some hollow spaces and sealed regions. These hollow spaces communicate with each other to form a thin gas passage ( ) together with a thick gas passage ( ) in this combustion apparatus ( ) in such a manner that its condition of thick and thin fuel combustion is rendered more stable.

A combustion apparatus ( ) with a burner port assembly ( ) comprises an elongated first array of main burner ports ( ) for jetting and burning a fuel gas mixture of a concentration to make main flames. The combustion apparatus ( ) comprises at least one second arrays of auxiliary burner ports ( ) for jetting and burning a further fuel gas mixture of a different concentration to make auxiliary flames, wherein the second arrays of said auxiliary burner ports ( ) extend along the first array of said main burner ports ( ). The burner port assembly ( ) is constructed using inner and outer wall segments ( ) together with outermost wall segments ( ) or bands ( ). One of the bands ( ) faces the corresponding one of said outermost segments ( ) so as to define between them collateral burner ports ( ).

Growing community of inventors

Kobe, Japan

Takashi Akiyama