CENTRIFUGAL BLOWER

To provide an axial flow impeller which can achieve both uniformizing of a flow velocity distribution in a blowout port and improvement in static pressure efficiency.SOLUTION: A centrifugal blower 1 includes: an impeller 2 having a plurality of forward-facing blades 51, for sucking air along a rotation center line C and blowing out the air radially; and a casing 3 which has a suction port 11 arranged on the rotation center line C of the impeller 2 and for guiding the air to the impeller 2, and a cylindrical part 23 extending in a tangential direction of the impeller 2 and having a blowout port 12 at a protrusion end for allowing the air blown out from the impeller 2 to flow out. The cylindrical part 23 includes: a first wall part 31 curbed in a protruding manner in the direction being separated from the rotation center line C of the impeller 2, and continuously connected to a peripheral wall 25 surrounding the periphery of the impeller 2; and a second wall part 32 opposed to the first wall part 31, and abutting on the peripheral wall 25 substantially in parallel with the rotation center line C of the impeller 2.SELECTED DRAWING: Figure 1 【課題】吹出口における流速分布の均一化と、静圧効率の向上とを両立可能な軸流羽根車を提供する。【解決手段】遠心送風機１は、複数の前向き羽根５１を有して回転中心線Ｃに沿って空気を吸い込み、放射状に空気を吹き出す羽根車２と、羽根車２の回転中心線Ｃ上に配置されて羽根車２へ空気を導く吸込口１１と、羽根車２の接線方向へ延びて突出端に羽根車２から吹き出す空気を流出させる吹出口１２を有する筒状部２３と、を有するケーシング３と、を備えている。筒状部２３は、羽根車２の回転中心線Ｃから離れる方向へ凸形状に湾曲し、羽根車２の周囲を囲む周壁２５に連続して繋がる第一壁部３１と、第一壁部３１に対向し、かつ羽根車２の回転中心線Ｃに実質的に平行して周壁２５に突き当たる第二壁部３２と、を有している。【選択図】 図１