Noritz Corporation

Shuji Kameyama

Keigo Fukunishi

Yasutaka Kuriyama

Norihide Wada

Tatsuya Karaki

Mitsuo Nomura

Takashi Hasegawa

Hironao Matsunaga

Takashi Akiyama

Masahiro Iguchi

Koji Shimomura

Masaaki Matsuda

Hidenori Hata

Shingo Kimura

Tadashi Takewaka

Masaaki Takata

Yukio Yoshida

Yasuhiko Sato

Takeshi Oohigashi

Kazuhiro Kimura

Keiichi Miura

Itsuo Nagai

Akira Tsutsumi

Nobuhiro Takeda

Shigeo Sugie

Masato Doyama

Hiroshi Asakura

Keiichi Amada

Takao Morigaki

Sakiko Kimura

Masahiko Shimazu

Toshikazu Miki

A fan includes: an impeller including a main plate having a first plane, a plurality of first blades each formed the first plane, and a shroud formed integrally with the plurality of first blades; a fan case; a drive source; and a rotation shaft. The first blades each include a linearly protruding region that is linearly increased in height from an outer circumferential side to an inner circumferential side, and a curvedly protruding region that is curvedly increased in height from the outer circumferential side to the inner circumferential side, the height extending in a direction in which each first blade protrudes. The linearly protruding region is welded to the main plate. Accordingly, a highly durable fan can be implemented that allows sufficient durability to be maintained even under a high temperature environment or an acid environment.

Fan and water heater provided with the same, and impeller and water heater provided with the same

A water heater capable of cooling a fan by inflow of air while suppressing backflow of combustion gas is provided. A fan includes: a fan case having a back surface wall; an impeller having a first blade and a second blade and housed in the fan case; a drive source rotating the impeller; and a rotation shaft coupling the impeller and the drive source through a through hole provided in the back surface wall. A gap through which air outside the fan case is suctioned into the fan case is provided between the rotation shaft and the back surface wall. The second blade faces the back surface wall without another member interposed therebetween throughout a range from an inner circumferential side to an outer circumferential side of the second plane.

Water heater

A fan assembly includes a fan and an emission connection portion. The fan includes a fan case having a first internal space, an impeller, and a rotation shaft. The emission connection portion includes a connection portion case having a second internal space and provided with an emission port for emitting gas sent from the fan to the outside of the fan assembly through the second internal space. In a plan view from a direction of axis of the rotation shaft, a tongue portion extending from one end toward the other end is located at a boundary between the first internal space and the second internal space, and the tongue portion is provided to extend to a position at least reaching a straight line connecting a center point of the emission port and a center of rotation of the rotation shaft to each other, from one end toward the other end.

Fan assembly and water heater

A water heater is provided that can suppress backflow (entry) of drainage water into a fan from downstream of the fan in a path of a flow of combustion gas. The fan includes a fan case, an impeller housed within the fan case, a drive source attached to the fan case so as to drive the impeller, and a rotation shaft connecting the impeller and the drive source. An exhaust connection portion has a connection portion case and is provided with an exhaust port for emitting combustion gas delivered from the fan to outside of the water heater. The exhaust connection portion also has a drainage water discharge portion for discharging drainage water accumulated downstream of the fan in the path of the flow of combustion gas.

A water heater of a latent heat recovery type includes: a combustion apparatus including a burner having a plurality of burner port portions and generating combustion gas from openings at ends of the plurality of burner port portions; a heat exchanger heating water that flows through inside by heat exchange with combustion gas generated in the combustion apparatus; and a fan suctioning the combustion gas that has passed through the heat exchanger and emitting combustion gas to outside of the water heater. The fan includes a fan case, an impeller housed within the fan case, and a drive source connected to the impeller. At least a part of an upper surface of a bottom wall of the fan case is inclined with respect to a reference plane including the openings of the plurality of burner port portions.

A fan serves to suction combustion gas which has passed through a secondary heat exchanger and emitting combustion gas to the outside of a water heater. A drainage water discharge pipe is connected to the secondary heat exchanger in order to discharge the drainage water produced as a result of recovery of latent heat in the secondary heat exchanger to the outside of the secondary heat exchanger. An air passage pipe is connected to an exhaust box. A Y-shaped pipe joint has a flow path allowing merging of the drainage water discharge pipe and the air passage pipe, and the flow path after merging leads to the outside of the water heater.

An exhaust adapter A having an inner tubular wallforming a through holecommunicating with an exhaust port, an outer tubular wallsurrounding the inner tubular wall, and an annular concave partformed between the inner tubular walland the outer tubular wall. One of at least two types of exhaust pipes having different pipe diameters can be selectively connected as an exhaust pipeby utilizing either the through holeor the annular concavity. Height Hof the inner tubular wallis designed to be lower than height Hof the outer tubular wall. Drain flowing in the annular concave partis prevented from flowing out around the outer tubular walland furthermore the exhaust adapter A can be accurately used for various types of exhaust pipes with different pipe diameters.

Exhaust adapter and combustion apparatus having the same

Duct joint

A secondary heat exchanger B for recovering latent heat from combustion gas includes water tubeseach of which is so inclined that a first endis positioned lower than a second end. Therefore, in draining water from each of the water tubes, water can be caused to flow smoothly into a water-inflow and hot-water-outflow headerA connected to the first ends. The secondary heat exchanger B includes a casingwhich includes an upper walland a bottom wallwhich are so inclined that the inner surfaces thereof extend generally in parallel with the water tubes, and the upper and the lower gapsandhave constant widths sand s. Therefore, the amount of heat recovery from the combustion gas passing through the gapsandcan be increased.

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

Himeji, Japan

Shuji Kameyama