为了防止粮库储藏的粮食发霉, 用离心式或轴流式鼓风机通风,一般都发出较强的噪声,风机功率愈大噪声愈严重。 美国在鼓风机的入口或出口处,安装了一个弯管式消声器,使鼓风机的噪声降低6-8分贝,如倍频带频率高于506赫兹,则可降低声压15—20分贝。弯管式消声器的构造见图.它由一 In order to prevent mildew food stored grain depot, with centrifugal or axial blower ventilation, are generally issued a strong noise, the greater the fan power, the more serious the noise. The United States installed a bellow-type muffler at the inlet or outlet of the blower to reduce the noise of the blower by 6-8 dB, or 15-20 dB of sound pressure at octave frequencies above 506 Hz. Elbow muffler structure shown in Figure. It consists of one