Denso Corporation

Syuzou Oda

Fumiya Ishii

Shoichi Imahigashi

Takumi Okamoto

Syoichi Imahigashi

Taro Ogura

Kouji Oota

Koutarou Fukuda

A film heater includes a transparent conductive film and first and second electrodes. The transparent conductive film includes a heat generating portion that generates heat when energized by the first and second electrodes. An outer edge of the heat generating portion has a short side, a long side, and first and second oblique sides. The first and second electrodes include a plurality of first and second connection portions corresponding to a plurality of first and second ports, respectively. A plurality of first and second current suppression portions is disposed to suppress flow of the current between the inside and outside of the heat generating portion through a region between the plurality of first and second ports, respectively. For each of some or all of the plurality of first ports, the current flows through the heat generating portion between the first port and at least two second ports.

Film heater

Each of a plurality of blades of a turbofan includes a thick wall portion, a thin wall portion and a stepped portion. The stepped portion is formed between the thick wall portion and the thin wall portion. A plate thickness of the stepped portion is progressively decreased toward a positive pressure surface of the blade in a direction that is directed from the thick wall portion toward the thin wall portion. In the blade, a first curved surface forms a negative pressure surface of the thick wall portion, and a second curved surface forms a negative pressure surface of the thin wall portion while the second curved surface is located on a side of the first curved surface where the positive pressure surface of the blade is placed, and a negative pressure surface of the stepped portion connects between the first curved surface and the second curved surface.

Turbofan

A centrifugal fan sucks in air from one side in an axial direction and blows out air outward in a radial direction. A blade leading edge is connected to a cylinder inner surface of a side plate. The blade leading edge has: a tip end extended linearly by an apex of a convex surface and connected to the cylinder inner surface; and a convex surface end indicating a boundary between the convex surface and a side surface of the blade. When the cylinder inner surface has: a diameter &#x3a6;a at a first position, which is an end position of the upstream tubular portion of the side plate on one side in the axial direction, a diameter &#x3a6;b at a second position where the blade leading edge is connected; and a diameter &#x3a6;c at a third position where the convex surface end is connected, a relationship of &#x3a6;a&#x2265;&#x3a6;b&#x2265;&#x3a6;c is satisfied.

Centrifugal fan and blower equipped with the centrifugal fan

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Kariya, Japan

Syuzou Oda