Discussion on Vibration Isolation Design of Side Wall Fan
A large elastic pad is used for the vibration isolation design of the side wall fan.Based on the classical solution of damped forced vibration of a single degree of freedom system,the relationships between the vibration isolation efficiencies and the parameters of the pad are further derived.The analyses show that for SR11 pad with area of(480×350)mm,the vibration isolation efficiency is equal to the expected value,80%when the thickness of the pad is 48.3mm.When the thickness of the pad is more than 14.05mm and less than 48.3mm,the vibration isolation efficiency increases sharply with the increase of the thick-ness;When the thickness of the pad is greater than 48.3mm,the vibration isolation efficiency increases very gently with the in-crease of the thickness;When the thicknesses of the pad are at or near 48.3mm,good vibration isolation effect can not only be ob-tained,the center of gravity of side wall fan and the cost of product can also be reduced.In their respective and certain ranges,the smaller the pad area,static elastic modulus and damping ratio are,the greater the isolation efficiency is and the better the isolation effect is.Furthermore,the installation design of side wall fan is improved.The pad of SR11 type is installed between the bottom surface of the fan and the lower surface of the square opening of the wall.The vertical reciprocating micro motion of the fan can be allowed.The vibration isolation performance of the elastic pad can be exerted.At the same time,prevent the air from going through the gap around the fan.
Side Wall FanFoamed Polyurethane Elastic PadVibration IsolationInstallation Improvement
NETL
NSTL
万方数据
