Rinnai Corporation

Toshimitsu Nagasaka

Takaaki Nakagoshi

Hidenao Negi

Masakazu Ando

In a heat exchanger, a respective meander passagein each of two stages connecting heat absorbing tubesdivided into the two stages and arranged in a flow direction of a combustion gas in an inside of a casingfrom one side to the other side in a Y-axis direction is constituted, and both a heat absorbing tubeof #at an upstream end of the meander passagein a first stage and a heat absorbing tubeof #at a downstream end of the meander passagein a second stage are made to be positioned at the one side in the Y-axis direction, notches are provided with each heat absorbing finat portions positioned at a more upstream side in the flow direction of the combustion gas than each heat absorbing tubeof the meander passagein the second stage, and first notchescorresponding to the heat absorbing tubeat a downstream end of the meander passagein the second passage are formed larger than second notchescorresponding to each heat absorbing tubeother than the heat absorbing tubeof #at the downstream end.

Heat exchanger

A thermal insulation material is arranged on an inner surface of a swelling part formed at a side plate part and outwardly swelling in an X-axis direction so as to be sandwiched from both sides in a Z-axis direction by a step outwardly bent in the X-axis direction and positioned an end, in a Z-axis plus direction, of the swelling part and by a structural member of a burner protruding inwardly in the X-axis direction from an end, in the Z-axis minus direction, of the side plate part. A vicinity portion of an end, in the Z-axis plus direction, of the thermal insulation material is held from an inside in the X-axis direction by a side edge portion, on each side in the X-axis direction, of the fins.

Combustion apparatus

A heat exchanger () having a temperature sensor () detecting a temperature of a water passage () including heat-transfer pipes (), (), a connecting portion (), an inlet pipe (), and an outlet pipe (), and a sensor bracket (), wherein the sensor bracket () is joined and fixed to the connecting portion () in a state in which at least a part of a base portion () of the sensor bracket () forming a mounting surface of the temperature sensor () is in surface contact with a planar portion () provided in the connecting portion (), and the temperature sensor () is secured to a joint portion () of the base portion () joined and fixed to the planar portion ().

A heat exchanger having a drainage member () mounted on an open end () of a heat-transfer tube (), wherein the drainage member () contains a flow guide portion () including an insertion portion () configured to be inserted into the heat-transfer tube () from the open end (), and a projecting portion () projecting toward an outside of the heat-transfer tube () from the open end () and extending downward.

Water heat exchanger with tube drainage member

A turbulence member is made of a flat plate member configured to be inserted into a heat-transfer tube having a substantially elliptical cross-sectional shape. The flat plate member is a generate turbulence in a fluid flowing inside the heat-transfer tube by a plurality of projected pieces projected on both front and back surfaces. A rotation preventing piece configured to prevent rotation of the flat plate member inside the heat-transfer tube is provided in at least one of both side edges along the flow passage direction in the flat plate member. The rotation preventing piece is provided at a predetermined angle to the flat plate member so that a forefront comes into contact with a tube wall inner circumferential surface of the heat-transfer tube. A space through which the fluid can circulate is formed between the rotation preventing piece and the tube wall inner circumferential surface.

Turbulence member and heat exchanger using same, and water heater

An indoor installation type combustion apparatus includes an upper surface of the exterior case has formed therein: a cylindrical exhaust connection port which is in communication with an exhaust duct and which is connectable to an exhaust pipe; a first cylindrical air supply connection port which is connectable to an air supply pipe of double-pipe system containing therein the exhaust pipe and which encloses the exhaust connection port; and a second cylindrical air supply connection port which is connectable to an air supply pipe of twin-pipe system which is separate from, and independent of, the exhaust pipe, a low-cost apparatus is provided in which the air flowing in from whichever the first and the second air supply connection ports will be treated by one and the same supply-air filter. An air supply box which is in communication with both the first and the second air supply connection ports is disposed.

Indoor installation type combustion apparatus

A forced air supply combustion apparatus sucks combustion air from an air supply port. An air filter for collecting foreign matters in the air is mounted on an air-supply-port-formed plate in an insertable and drawable manner. A filter frame is arranged to be brought into close contact with a peripheral part of the air supply port in a state of having mounted the air filter in position. The air-supply-port side edge parts are provided with retaining pieces to clamp a filter side frame part in the Z-axis direction against the side edge parts. A distance in the Z-axis direction between the air-supply-port side edge parts, and the retaining pieces is set larger than a dimension, in the Z-axis direction, of the filter side frame part, and is set smaller than a sum of the dimensions to be obtained by adding to said dimensions the projection height of the projections provided in a projecting manner.

Forced air supply type of combustion apparatus

A turbulence generator includes a flat plate member () having a plurality of through holes (), (), and pairs of projecting pieces () and () projecting respectively from upstream-side edges and downstream-side edges of the through holes (), (), wherein the pairs of projecting pieces () and () project alternately to front and back surface sides of the flat plate member ().

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Nagoya, Japan

Toshimitsu Nagasaka