LOW NOISE MOTOR FAN

摘要

PURPOSE:To decrease noise by making a hollow tube manufactured from the material having viscoelasticity silencer element, forming a part of a casing with the silencer element and so setting its silencer frequency as to be equal to the predominant frequency of the noise. CONSTITUTION:A silencer element 1 is retained by a frame 10 and formed as a casing 2 and the silencer element 1 is made of material having viscoelasticity into cylindrical shape. The silencer element 1 is retained between the tips of a retaining cylinder 14 and a motor 4 is arranged in the cylinder. And the silencer frequency of the silencer element 1 is set equal to the predominant frequency of the noise. For this reason the generated noise can be reduced by a silencer.