Rinnai Corporation

Hidenao Negi

Toshimitsu Nagasaka

Takaaki Nakagoshi

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 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

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

Hidenao Negi