1.合理选择通风机的机型。在噪声控制要求高的场合，应选用低噪声通风机。不同型号的通风机，在同样的风量、风压下，机翼型叶片的离心通风机噪声小，前向板型叶片的离心通风机噪声大。

1. Reasonably choose the model of ventilation fan. In situations with high noise control requirements, low noise ventilation fans should be selected. Different models of ventilators, under the same air volume and pressure, have lower noise levels for centrifugal ventilators with wing shaped blades and higher noise levels for centrifugal ventilators with forward facing plate shaped blades.

　　2.通风机的工作点应接近最高效率点。同一型号的通风机效北越高，噪声越小。为使通风机的运行工况点保持在通风机的高效率区，应尽量避免用阀门进行工况调节。如必须在通风机压出端设阀门时，其设置的最佳位置是距通风机出口1m处。它能使2000Hz以下的噪声降低。在通风机入口处气流应保持均匀。

The working point of the ventilation fan should be close to the highest efficiency point. The higher the efficiency of the same model of ventilation fan, the lower the noise. To maintain the operating point of the ventilation fan in the high-efficiency zone, it is advisable to avoid using valves for condition adjustment as much as possible. If it is necessary to install a valve at the outlet of the ventilation fan, the optimal position for setting it is 1 meter away from the outlet of the ventilation fan. It can reduce noise below 2000Hz. The airflow at the entrance of the ventilation fan should be kept uniform.

　　3.在可能条件下适当降低通风机的转速。通风机的旋转噪声与叶轮圆周速度10次方成比例，涡流噪声与叶轮圆周速度6次方(或5次方)成比例。故降低转速可降低噪声。

3. Reduce the speed of the ventilation fan appropriately under possible conditions. The rotational noise of the ventilation fan is proportional to the 10th power of the impeller circumferential speed, and the eddy current noise is proportional to the 6th power (or 5th power) of the impeller circumferential speed. Therefore, reducing the speed can reduce noise.

　　4.通风机进、出口的噪声级是通风理、风压增加而增大的。因此，设计通风系统时，应尽量减少系统的压力损失。当通风系统的总风量和压力损失较大时，可将其分为小系统。

The noise level at the inlet and outlet of the ventilation fan increases with the increase of ventilation efficiency and wind pressure. Therefore, when designing a ventilation system, efforts should be made to minimize the pressure loss of the system. When the total air volume and pressure loss of the ventilation system is large, it can be divided into small systems.

　　5.气流在管道内的流速不宜过高，以免引起再生噪声。确定管道内气流流速应根据不同要求按有关规定选取。

5. The flow velocity of the airflow in the pipeline should not be too high to avoid causing regeneration noise. The determination of the airflow velocity inside the pipeline should be selected according to different requirements and relevant regulations.

　　6.注意通风机与电动机的传动方式。采用直联传动的通风机噪声最小，用联轴器的次之，用没有接缝的三角皮带传动的稍差。通风机应配用低噪声的电动机。

6. Pay attention to the transmission mode between the ventilation fan and the electric motor. The ventilation fan using direct transmission has the lowest noise, followed by the one using couplings, and slightly worse when driven by a V-belt without joints. Ventilation fans should be equipped with low-noise electric motors.

以上是关于 济南通风管道 的介绍，若想了解相关知识可请点击：http://www.jntfgd.com 我们将会全心全意为您提供满分服务，欢迎您的来电！

The above is an introduction to Jinan ventilation ducts. If you want to learn more about related knowledge, please click: http://www.jntfgd.com We will wholeheartedly provide you with full score service. Welcome to call us!