屋顶离心风机产生的噪音一般都是在它运行过程中作为空气的动力与周围环境的摩擦和阻隔产生。如果是屋顶离心风机的叶轮的圆周速度过高,空气产生的噪音的影响就会越多,它占有总体噪音的比例就会相应增大。其中噪声的决定性因素是线速度。知道了这一点我们在选购屋顶离心风机的时候就要考虑到空气动力噪音在整个噪音污染中的重要影响。如何减少空气动力噪音?在风压和风量稳定的情况下,减少风机的噪音需要考虑到以下十个方面:
The noise generated by a centrifugal fan on the roof is usually caused by friction and obstruction between the power of the air and the surrounding environment during its operation. If the circumferential speed of the impeller of the roof centrifugal fan is too high, the more noise generated by the air will be affected, and the proportion of its total noise will increase accordingly. The decisive factor in the noise is the linear velocity. Knowing this, we must take into account the important influence of aerodynamic noise on the whole noise pollution when we choose the roof centrifugal fan. How to reduce aerodynamic noise? Under the condition of stable wind pressure and air volume, the following ten aspects need to be considered in order to reduce the noise of the fan.
1、关注屋顶离心风机中气流的流动速度和流动方向,在屋顶离心风机的叶片的尾端尽可能地让它们变化地大一些。
1, pay attention to the flow speed and flow direction of the air flow in the roof centrifugal fan, and make them change as much as possible in the tail end of the blade of the roof centrifugal fan.
2、屋顶离心风机的选型也是一个重要的解决方案。选择的屋顶离心风机最好是低速后弯叶型,它们的工作点必须要和屋顶离心风机的最高效率点运行比较接近。
2, the selection of the roof centrifugal fan is also an important solution. The selected roof centrifugal fans are preferably low speed curved blades, and their working points must be close to the maximum efficiency points of the roof centrifugal fans.
3、屋顶离心风机和电动机需要直接连接的传动方式,这样减少噪音的效果是最好的,联轴器连接屋顶离心风机和电动机也是一种不错的减少噪音的传动方式。如果必须需要间接传动,为了减少屋顶离心风机产生的噪音,需要用没有缝隙的V带连接电机和屋顶离心风机。
3, the roof centrifugal fan and the motor need direct connection transmission, so that the noise reduction effect is the best, coupling the roof centrifugal fan and motor is also a good way to reduce noise. If indirect transmission is necessary, in order to reduce the noise generated by the centrifugal fan on the roof, it is necessary to use the V belt without gaps to connect the motor and the roof centrifugal fan.
4、可以通过减少风道中的空气流动的速度来减少在它运行过程中气流的波动引起的屋顶离心风机产生噪音。一般来说,需要将屋顶离心风机的主风道的空气流动速度控制在每秒钟八米的速度。特别是对于消声非常严格的屋顶离心风机以及它们的工作环境,主风道中的流动速度不可超过每秒8米的数值。
4, by reducing the speed of air flow in the duct, the noise of the roof centrifugal fan caused by the fluctuation of air flow during its operation can be reduced. Generally speaking, it is necessary to control the air flow rate of the main air duct of the roof centrifugal fan at a speed of eight meters per second. Especially for the roof centrifugal fans with very strict noise elimination and their working environment, the flow velocity in the main air duct can not exceed 8 meters per second.
5、将屋顶离心风机的进口和出口设计成直来直去的形态,不能够急转弯,以免减少流动的空气对于进出口产生的阻力噪音。同时,利用软性的接头连接,可以减少流动的空气产生的屋顶离心风机的噪音。电动机和屋顶离心风机都有安装在隔振基础上。
5, the import and export of the roof centrifugal fan is designed to be a direct and direct form, so it can not turn quickly enough to avoid reducing the resistance noise caused by the flow of air to the import and export. At the same time, the use of flexible joint connection can reduce the noise of the roof centrifugal fan generated by the moving air. Both the motor and the roof centrifugal fan are installed on the base of vibration isolation.
6、可以用隔声材料制作成围护结构,将声源控制在其中,可以减少屋顶离心风机在运行过程中产生的噪音向外传播,一般的情况下,很多屋顶离心风机的使用者都是放上一个风机小室。
6, the sound insulation material can be made into a enclosure structure, and the sound source is controlled in it, which can reduce the noise produced during the operation of the roof centrifugal fan. In general, many users of the roof centrifugal fan are put on a small fan room.
7、操作车间和机房之间的距离要尽可能地缩短。在选择屋顶离心风机的时候,不要留下太多的压头。假设屋顶离心风机的系统比较大,需要设置回风机,其中的噪音也会得到很大程度上的削弱。
7, the distance between the operation workshop and the computer room should be shortened as far as possible. When choosing the roof centrifugal fan, do not leave too many indenters. Assuming that the system of the roof centrifugal fan is relatively large, it is necessary to set up the return air fan, and the noise will also be greatly weakened.
8、在通风系统一定的情况下,系统阻力的常数也会相对比较稳定。在这种情况下,可以将风机的风量降低,那么屋顶离心风机的线速度也会降低,这样噪音也就会得到一点的控制。
8, under certain conditions of ventilation system, the constant of system resistance will be relatively stable. In this case, the air volume of the fan can be reduced, and the line speed of the roof centrifugal fan will also be reduced, so that the noise will get a little control.
9、在设计屋顶离心风机的时候,特别注意系统管路的设计让气流可以在管路中均匀流动,可以减少气流紧急转弯产生的一部分噪音。特别是主管道,以及在进入到操作车间的支管连接的地方,需要精心设计管路。
9. In the design of the roof centrifugal fan, special attention is paid to the design of the system pipeline so that the air flow can flow evenly in the pipeline, which can reduce the noise produced by the emergency turn of the air flow. In particular, the main piping, as well as the branch pipe connections that enter the operation workshop, need to be carefully designed.
10、部分人会在屋顶离心风机上加上调节阀,其实这些调节阀也是增加噪音的罪魁祸首,我们在安装屋顶离心风机的时候要尽量减少调节阀的使用。
10, some people will add the regulating valve on the roof centrifugal fan. In fact, these regulating valves are also the culprit of increasing the noise. We should try to reduce the use of the regulating valve when we install the roof centrifugal fan.
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