Hypsokinesis formula centrifugal fan

The utility model provides a hypsokinesis formula centrifugal fan, including an impeller, the impeller include a plurality of blade and blade nonworking face with blade retention's last chassis and lower chassis, the area of going up the chassis is greater than lower chassis, go up the chassis with the one side of blade contact is provided with streamlined arch. The air current that the blade formed when rotatory is through streamlined bellied integration back, even rebound the return air machine again, belliedly suitably blocks owing to streamlined for the air current has reduced the noise generation in softly getting into the fan, thereby reduces the noise at work of fan. 本实用新型提供了种后倾式离心风机，包括叶轮，所述叶轮包括若干个叶片和在所述叶片非工作面与所述叶片固定的上底盘和下底盘，所述上底盘的面积大于所述下底盘，所述上底盘与所述叶片接触的面设置有流线型凸起。叶片旋转时形成的气流经过流线型凸起的整合后，即使再反弹回风机，由于流线型凸起的适当阻挡，使得气流柔和地进入风机内，减少了噪音的产生，从而降低风机的工作噪音。