Noritz Corporation

Yuta Tsuji

Hideyuki Fujisawa

Naoki Se

Hiroki Yamaji

Keizo Kawano

Ryosuke Umakoshi

Tatsuya Karaki

Masahiro Iguchi

Taihei Terasawa

Kenichi Sakurai

Michihisa Nakahara

Kazuyuki Goto

Kazuyuki Gotou

Masahiro Kawamoto

Masaharu Imaizumi

Masato Yoshida

Katsuya Imaoka

Yoshinobu Shinozaki

A heat exchanger includes tube expansion portions provided respectively on a plurality of heat transfer tubes such that outer peripheral surfaces of the heat transfer tubes are respectively pressed against inner peripheral surfaces of a plurality of first holes provided in a side wall portion of a case, and a plurality of first concave surface portions provided in an outer surface of the tube expansion portion so that first gaps, into which brazing material of a first brazed portion advances, are formed between the outer surface of the tube expansion portion and the inner peripheral surface of the first hole. At least one of the plurality of first concave surface portions is positioned in an outside peripheral surface portion of the outer peripheral surface of the heat transfer tube. According to this configuration, the strength with which the heat transfer tubes are attached to the case can be increased while simplifying a manufacturing operation and reducing the manufacturing cost.

Heat exchanger and manufacturing method therefor

A cover member of a gas supply manifold has a bent rising wall portion that is formed by bending a part of the cover member so as to rise in an opposite direction of a main body. The bent rising wall portion is in a form of a loop surrounding the entire circumference of a gas supply flow path and an area around the gas supply flow path. Such configuration increases the rigidity of the cover member and prevents large distortion of the cover member and leakage of gas from the gas supply flow path. As a result, the thickness of the cover member is reduced and the weight and the production cost of the gas supply manifold are also reduced.

Gas supply manifold and gas combustion device provided with the same

A gas supply manifold has a nozzle forming member having a plurality of gas injection nozzles, a cover member configured to be overlapped on the nozzle forming member, and a caulking-fastening portion configured to fasten the nozzle forming member and the cover member. The caulking-fastening portion is configured such that a convex portion provided for one of the nozzle forming member and the cover member penetrates a hole provided for the other member, and a tip end portion of the convex portion has an engagement portion, the engagement portion having a larger diameter or a larger width than the hole and being engaged with a peripheral edge portion of the hole. A tip end face of the convex portion has a dent portion formed by pressing the tip end face into a base portion side of the convex portion and an area around the dent portion constitutes the engagement portion. Thus, the nozzle forming member and the cover member are appropriately caulked and fastened.

Gas supply manifold and production method of gas supply manifold

A header of a heat exchanger including a first wall connected with a plurality of heat transfer tubes of the heat exchanger, a second wall facing the first wall with an interval therebetween, and a circumferential wall connecting outer circumferential edges of the first and the second walls in such a manner that an area between the first and the second walls constitutes a chamber for inflow of fluid, the chamber communicating with each of the heat transfer tube. At least one of the first and the second walls is configured to curve in such a manner that a central area of the wall is positioned close to an inside of the chamber than an outer circumferential area of the wall. The thickness of the header is reduced and enough strength of the header is obtained, thereby preferably enduring repeating water hammer.

Header of heat exchanger and heat exchanger provided with the same

The heat exchanger wherein each end of a plurality of heat transfer tubes is connected to an end wall of a bulging portion provided at a side wall of a case, an open edge of a header is fitted onto the bulging portion, and a chamber connecting with each heat transfer tube is formed. For jointing the header to the side wall, an inner circumferential end of the open edge of the header is formed as a first curved surface with a convex section, an outer face of the circumferential wall of the bulging portion is formed as a second curved surface with a concave section, the first curved surface and the second curved surface contact each other, and the surface-contact portion and the area therearound are welded. The number of the members is reduced, the structure is simplified, and the production cost of the heat exchanger is reduced.

Heat exchanger and production method thereof

The heat exchanger HE comprising a casehousing a plurality of heat transfer tubesand a headerhaving a hollow main bodywith an open edge. A side wallof the caseis provided with a bulging portionhaving a cylindrical circumferential wallbulging out of the caseand an end wallwhich blocks a tip portion of the circumferential wall. Each end of the heat transfer tubesis inserted into a penetrating holeprovided for the end wallof the bulging portion, and is jointed to the end wall, and the open edgeof the headeris fitted onto the circumferential wallof the bulging portion, thereby forming a chambercommunicating with the inside of each heat transfer tube. Therefore, it is possible that the number of the members of the heat exchanger HE is reduced, the configuration is simplified, and the heat exchanger HE is easily manufactured at low cost.

Growing community of inventors

Kobe, Japan

Yuta Tsuji