Noritz Corporation

Hideyuki Fujisawa

Naoki Se

Yuta Tsuji

Shoji Okuda

Taihei Terasawa

Kenichi Sakurai

Kazuyuki Goto

Michihisa Nakahara

Keizo Kawano

Masaki Kondo

Ryosuke Umakoshi

Tatsuya Karaki

Masahiro Iguchi

Hiroki Yamaji

Joji Endo

Masato Yoshida

Yoshinobu Shinozaki

Gaku Sato

Katsuya Imaoka

Kazuyuki Gotou

Masahiro Kawamoto

Yoshinori Hokada

Yukiko Kashima

Masaharu Imaizumi

A heat exchanger includes a plurality of heat transfer tubes housed in a predetermined case, a connecting tube body for connecting the plurality of heat transfer tubes, a predetermined tube expansion portion provided on each heat transfer tube, a first peripheral wall portion provided on the tube expansion portion, and a second peripheral wall portion that is positioned on an end portion of the connecting tube body and fitted to the tube expansion portion, wherein the first and second peripheral wall portions have different sectional shapes and are fitted together in a partial contact state including predetermined contact and non-contact portions. According to this configuration, the heat transfer tubes can be fixed to a side wall portion of the case and the connecting tube body can be connected to the heat transfer tubes easily and appropriately.

Heat exchanger and manufacturing method therefor

A metal bend pipe having a bend portion bent in a semi-circular arc shape is provided, in which an identification part that enables one of the two end portions of the bend portion to be identified as the bending-start side or the bending-end side is provided, and the identification part is integrally formed as a protruding and/or recessed three-dimensional region. Thus, it is possible to easily and reliably identify which of the two end portions of the bend portion is the bending-start side or the bending-end side.

Bend pipe and method for manufacturing same

A heat exchanger includes a tube expansion portion formed by expanding a heat transfer tube so that an outer peripheral surface of the heat transfer tube is pressed against an inner peripheral surface of a hole provided in a side wall portion of a case. The tube expansion portion includes first and second bulge portions positioned respectively on the inside and the outside of the side wall portion so as to sandwich the side wall portion in an axial length direction of the heat transfer tube and configured such that respective outer peripheral surfaces thereof partially bulge outward in a radial direction of the heat transfer tube, an end portion tip end of the heat transfer tube is positioned apart from the second bulge portion, and the end portion tip end and a part in the vicinity thereof are expanded so as to be included in a part of the tube expansion portion. Thus, effects such as improving the precision with which the side wall portion of the case, the heat transfer tube, and a connecting tube are fitted to each other can be achieved, and as a result, the respective parts can be brazed easily and appropriately.

A heat exchanger includes a tube expansion portion provided on a heat transfer tube such that an outer peripheral surface of the heat transfer tube is pressed against an inner peripheral surface of a first hole provided in a side wall portion of a case, and a first concave surface portion that is provided in a part of an outer surface of the tube expansion portion and forms a first gap, into which brazing material of a first brazed portion advances, between the outer surface of the tube expansion portion and the inner peripheral surface of the first hole. Thus, the attachment strength of the heat transfer tube can be improved by means of a simple configuration.

The burner case has a first member having a caulking portion and a second member having a facing portion facing the caulking portion and an extending portion for caulking, the extending portion extending from the facing portion, the caulking portion being held between the facing portion and the extending portion by bending the extending portion. A part of the extending portion in longitudinal direction constitutes a claw portion. Thus, the first member and the second member are not required to be screwed or the number of screws is reduced, thereby improving productivity of the burner case and reducing the production cost of the burner case.

Burner case production method and burner case

A heat transfer tube of a heat exchanger is provided with a first and a second annular convex portions of which outer diameters are partially expanded. The first annular convex portion is positioned on an inner face side of a side plate portion of a case of the heat exchanger and is engaged with a circumferential edge portion of a first hole portion provided for the side plate portion, or the first annular convex portion contacts under pressure with an inner circumferential face of the first hole portion. The second annular convex portion is positioned on an outer face side of a header constituting member and is engaged with a circumferential edge portion of a second hole portion. Thus the side plate portion, the heat transfer tube, and a header are relatively fixed by a simple means.

Heat exchanger and production method of the heat exchanger

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 heat exchanger has a case housing a plurality of heat transfer tubes, a pair of header portions for water inflow and for water outflow, the pair of header portions connecting with both ends of the plurality of heat transfer tubes, and a pair of wall portions for headers respectively constituted with an auxiliary member formed separately from a side plate member of the case, the wall portions for headers constituting the pair of header portions by being assembled with the side plate member. The pair of wall portions for headers are configured to be integrally connected with each other. Thereby, production of the pair of header portions are facilitated and the production cost of the heat exchanger is reduced.

Heat exchanger

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.

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Kobe, Japan

Hideyuki Fujisawa