Noritz Corporation

Masahiro Iguchi

Takashi Hasegawa

Shuji Kameyama

Yasutaka Kuriyama

Takashi Akiyama

Koji Shimomura

Hidenori Hata

Masaaki Matsuda

Shingo Kimura

Yasuhiko Sato

Norihide Wada

Hideyuki Fujisawa

Keiichi Miura

Itsuo Nagai

Yuta Tsuji

Kazuhiro Nishimura

Shigeo Sugie

Hiroki Yamaji

Takao Morigaki

Masahiko Shimazu

Toshikazu Miki

Keisuke Iwai

Kazuyuki Gotou

A hot water supply device including an inlet pipe, an outlet pipe, a burner unit, a heat exchanger, an exhaust aperture, a first temperature sensor detecting a measured exhaust temperature of the exhaust gas, a second temperature sensor detecting a water temperature of water entering the inlet pipe, and a processor. The processor is configured to obtain an error between the measured exhaust temperature and an estimated exhaust temperature, and detects that scale clogging has occurred inside the heat exchange tubing based on an index which is generated using the error between the measured exhaust temperature and the estimated exhaust temperature. The estimated exhaust temperature is a first predetermined value that is determined using a numerical equation which has at least the water temperature of water entering the inlet pipe and a scale number of the hot water supply device as variables of the numerical equation.

Hot water supply device

A heat exchanger includes a case into which heating gas is supplied, a heat transfer pipe accommodated in the case, and first and second header sections, each of which has a chamber formed using a protruding part provided in the sidewall section, and to which the heat transfer pipe is connected such that a fluid to be heated enters and exit the chamber. The sidewall section has a configuration in which an inner plate and an outer plate overlap each other, the protruding part of the first header section is provided on the inner plate and protrudes toward an inside of the case, and the protruding part of the second header section is provided on the outer plate and protrudes toward an outside of the case.

Heat exchanger and water heating apparatus including the same

A heat exchanger includes fins and a plurality of pairs of cut-and-raised parts. Each pair of the cut-and-raised parts are positioned on both left and right sides in a width direction on a downstream side in a heating gas flowing direction around an outer circumference surface of each of upstream pipe body parts and face a downstream part on the outer circumference surface with a first gap therebetween. A width between upstream end parts of each pair of the cut-and-raised parts is larger than an outer diameter of each of the upstream pipe body parts. In addition, each pair of the cut-and-raised parts are inclined such that a width between downstream end parts becomes smaller than the width between the upstream end parts. A heating gas passing part having a width narrower than a dimension therebetween is provided in a region between two adjacent upstream pipe body parts.

Heat exchanger and water heating apparatus including same

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.

Heat exchanger and production method thereof

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.

Combustion apparatus

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

Hyogo, Japan

Masahiro Iguchi