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    • 40. 发明公开
    • Ducting
    • Leitung
    • EP1344969A2
    • 2003-09-17
    • EP03004009.1
    • 2003-02-24
    • Smiths Group plc
    • Gibson, Diane
    • F16L11/115F16L55/033
    • F16L11/115F02M35/10137
    • Sound attenuating ducting has an inner, helical wire 1 supporting an inner and outer layer 2 and 7 formed by strips 3 and 8 of a foamed thermoplastic rubber material. Axial and helical reinforcing yarns 5 and 6 extend along the ducting between the layers 2 and 7. The two strips 3 and 8 are applied from extruders, the extrusion rate of the inner strip being set to be less than that of the outer strip so that the inner strip is stretched to produce a more porous structure than in the outer strip. In this way, the inner layer 2 is efficient in absorbing orifice noise within the ducting and the outer layer 7 contains radiated noise.
    • 声衰减管道具有内螺旋线1,其支撑由发泡热塑性橡胶材料的带3和8形成的内层和外层2和7。 轴向和螺旋形增强纱线5和6沿着层2和7之间的管道延伸。两个条带3和8从挤出机施加,内条带的挤出速率设定为小于外条带的挤出速率,使得 内带被拉伸以产生比在外条中更多孔结构。 以这种方式,内层2在管道内吸收孔噪声是有效的,而外层7包含辐射噪声。