COUNTER-ROTATING AXIAL FLOW FAN
    2.
    发明申请
    COUNTER-ROTATING AXIAL FLOW FAN 有权
    逆转轴流风扇

    公开(公告)号:US20110142614A1

    公开(公告)日:2011-06-16

    申请号:US12967196

    申请日:2010-12-14

    IPC分类号: F04D29/52 F04D19/02

    摘要: A counter-rotating axial flow fan with reduced noise at the target operating point achieved without modifying a front impeller, a rear impeller, or a middle stationary portion is provided. An annular rib including a projecting surface for generating turbulent flow is formed on an inner wall portion of a casing at a position off from the middle stationary portion to a side of the rear impeller, the projecting surface extending radially inwardly of the inner wall portion and extending continuously in the circumferential direction of the inner wall portion. A fluid striking the projecting surface for generating turbulent flow is partially disturbed to form a turbulent flow before entering an area in which the rear impeller is provided. The turbulent flow suppresses flow separation of a fluid flowing along the surfaces of rear blades of the rear impeller from the surfaces of the rear blades.

    摘要翻译: 提供了在不改变前叶轮,后叶轮或中间静止部分的情况下实现在目标操作点处具有降低的噪声的反向旋转轴流风扇。 在从中间静止部分到后部叶轮的一侧的位置处,在壳体的内壁部分上形成包括用于产生湍流的突出表面的环形肋,所述突出表面沿着内壁部分的径向向内延伸, 在内壁部的圆周方向上连续延伸。 撞击突出表面以产生湍流的流体在进入其中设置后叶轮的区域之前部分地被扰动以形成湍流。 湍流抑制沿着后叶片的后叶的表面流动的流体与后叶片的表面的流动分离。