Noritz Corporation

Hitoshi Hara

Tetsurou Hamada

Hiroki Hasegawa

Kozo Uehara

Toshihiro Hori

Hideaki Yoshitomi

Hiroaki Takashima

Kimiaki Asano

Yoshinori Kanda

Yutaka Nakamura

Mitufuku Asakawa

A heat exchanger Aincludes a partitionpartitioning the spacesurrounded by a coiled tubeat an axially intermediate portion of a housinginto a first and a second regionsandand partitioning the coiled tubeinto a first and a second heat exchanging portions HTand HT. The combustion gas supplied to the first regionflows to a combustion gas pathby passing through a clearanceof the first heat exchanging portion HTand then passes through a clearanceof the second heat exchanging portion HT. With this structure, the amount of heat recovery is increased, and the heat exchange efficiency is enhanced while simplifying the overall structure of the heat exchanger Aand reducing the size of the heat exchanger.

Heat exchanger and water heater

A heat exchanger Aincludes a coiled tubeincluding a plurality of loopsand a spacesurrounded by the coiled tubeand having an end closed by a partitionThe heat exchanger is so designed that combustion gas flows from the spaceto a combustion gas pathby passing through clearancesof the loopsof the coiled tubeThe loopsare made of a tube having a thickness tand a width Lwhich is larger than the thickness, so that the amount of heat recovery when the combustion gas passes through the clearancesis large. Therefore, the heat exchange efficiency is enhanced while simplifying the overall structure of the heat exchanger Aand reducing the size of the heat exchanger.

A combustion apparatushas a fuel spraying nozzle, a feed canaland a return canal, both the canals connected to the nozzle, with the former canalfeeding a fuel to the nozzle and with the later canalallowing an unsprayed portion of the fuel to flow back. An electro-magnetic pumpdisposed in the feed canalserves to compress the fuel towards the nozzle, and an injector valveis disposed in the return canal. A low rate at which the fuel is sprayed out from the nozzle is controlled by a controlling meansby regulating the mode of opening and closing the valve bodyof injector valve

Combustion apparatus

A combustion apparatushas an anti-spreading memberdisposed below a combustion chamber. This anti-spreading memberis composed of a generally cylindrical main body, an outer flangeand an inner flange, these flanges being formed at and integral with the opposite ends of the main body, respectively. A controllerfor regulating the operation of this apparatusis designed to preheat the anti-spreading memberat a heat generation rate 'q' lower than the required heat generation rate 'Q', before the apparatus starts its normal operation to burn a fuel.

A combustion apparatushas a fuel spraying nozzle, a feed canaland a return canal, both the canals connected to the nozzle, with the former canalfeeding a fuel to the nozzle and with the latter canalallowing an unsprayed portion of the fuel to flow back. An electromagnetic pumpdisposed in the feed canalserves to compress the fuel towards the nozzle, and an injector valveis disposed in the return canal. A controllerregulates the operation of the injector valvein the manner of duty-ratio control so as to adjust the flow rate of the fuel being sprayed out of the nozzle

Growing community of inventors

Kobe, Japan

Hitoshi Hara