Noritz Corporation

Shigeo Sugie

Takashi Hasegawa

Shuji Kameyama

Yasutaka Kuriyama

Takashi Akiyama

Itsuo Nagai

Kyohei Ogawa

Masahiro Iguchi

Kenichi Nakayama

Koji Shimomura

Kazuhiro Nishimura

Hidenori Hata

Masaaki Matsuda

Shingo Kimura

Yasuhiko Sato

Makoto Hamada

Yoshihito Okitsu

A premixing device includes: a gas flow path for allowing air to flow; a gas outlet that allows fuel gas to flow out into the gas flow path by utilizing a negative pressure; and a flapper disposed in the gas flow path. The premixing device further includes an operation regulating part for the flapper which allows the opening degree of the flapper to change according to the air flow rate in a range below a predetermined upper limit position while preventing the flapper from rotating in an opening direction beyond the upper limit position. The operation regulating part is capable of selectively switching and setting one of a first upper limit position for normal combustion and a second upper limit position for fuel ignition. The opening degree of the flapper at the second upper limit position is smaller than that at the first upper limit position.

Premixing device and combustion device including the premixing device

A plate heat exchanger includes a plurality of plates stacked so that a liquid flow passage is formed on the inside thereof, and a gas flow passage through which heating gas passes, the gas flow passage being formed between the plurality of plates and including a gas inflow opening portion and a gas outflow opening portion positioned on an opposite side to the gas inflow opening portion, wherein the gas outflow opening portion has a smaller opening area than the gas inflow opening portion. Thus, when the heating gas passes through the gas flow passage, even if the volumetric flow thereof decreases due to a reduction in temperature or condensation, a reduction in the flow velocity of the heating gas can be suppressed. Hence, a reduction in a heat transfer coefficient can be suppressed, leading to an improvement in heat transfer efficiency, and as a result, reductions in overall size, weight, and manufacturing cost can be achieved appropriately.

Plate heat exchanger and water heater including same

A shaft body () is rotatable around an axial line (C-C). A first valve element () is located between a first opening () and a second opening () and it has a first notch (). A second valve element () is located between first opening () and a third opening () and it has a second notch (). By rotating first and second valve elements () around the axial line (C-C) as a center (O), an operation for opening and closing first and second notches () can be performed.

Valve apparatus and water heating 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 ( ).

Combustion apparatus

Growing community of inventors

Kobe, Japan

Shigeo Sugie