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隔声罩是其罩壁具有隔声能力.其外形与声源机器相当的一种结构,将声源机器全部罩盖,切断其空气声途径使不向周围传播.但声源机器由于在操作和维修等方面的要求,其所连接的管道、电缆和转轴,需经在罩壁上的开孔通入或引出,或者在罩壁设置的门、窗或活动盖板,以及罩壁的相互连接,均可能存在程度不同的孔缝.这样,罩内的空气声有可能由此外逸(一般称为漏声),使隔声罩的隔声效果降低.设若一个理想的隔声壁(τ_(壁)=0),如壁上有一个为壁面积1/100的孔(τ_(孔)=1),则这个壁的平均透声系数τ为:
Sound insulation cover is its cover wall with sound insulation capacity.Its shape and sound source machine is a structure that covers all the sound source machine cover, cut off its air sound way to not spread around.But the sound source machine due to the operation And maintenance requirements, the pipes, cables and shafts connected to them must be led in or out through the openings in the cover wall or the doors, windows or movable cover plates provided in the cover wall and the mutual connection of the cover walls There may be some degree of holes in the connection, so that the air inside the cover may escape (commonly referred to as leakage), so that the noise insulation effect of the noise reduction hood.If an ideal sound-insulating wall (τ_ (Wall) = 0). If there is a hole in the wall that has a wall area of 1/100 (τ_ (hole) = 1), the average sound transmission coefficient τ of this wall is: