Noise reduction mechanism of fan device and molding method of porous damping material therefor
    21.
    发明授权
    Noise reduction mechanism of fan device and molding method of porous damping material therefor 失效
    风机装置降噪机构及多孔阻尼材料成型方法

    公开(公告)号:US06454527B2

    公开(公告)日:2002-09-24

    申请号:US09771932

    申请日:2001-01-30

    IPC分类号: F04D2966

    摘要: Porous damping material (40) is attached to an entire inner circumference of the fan shroud (20) opposing to an end of a fan (4) and is exposed to opposing space without using conventional perforated metal. Accordingly, jet noise caused by strong swirl between the fan (4) and the fan shroud (20) can be damped by the damping material (40) and impulsive sound scarcely occurs. Thus, both of the impulsive sound and the jet noise can be effectively damped, thereby securely reducing noise. The pours member (401) constituting the porous damping material (40) is a die-molding product made by a die (150) having a cavity (153).

    摘要翻译: 多孔阻尼材料(40)附接到与风扇(4)的端部相对的风扇罩(20)的整个内周,并且不使用常规的穿孔金属而暴露于相对的空间。 因此,由风扇(4)和风扇罩(20)之间的强烈漩涡引起的喷气噪声可被阻尼材料(40)阻尼,并且几乎不发生脉冲声。 因此,可以有效地抑制脉冲声和喷射噪声,从而可靠地降低噪音。 构成多孔阻尼材料(40)的浇注构件(401)是具有空腔(153)的模具(150)制成的模制产品。