降低通风机声源噪声有哪些方法？

发布人：http://www.sftfgd.com   发布时间：2018-04-24 19:02:09

(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) choose the type of the ventilator reasonably. Low noise ventilator should be chosen when noise control requirements are high. Under the same air volume and wind pressure, the centrifugal fan with wing type blades has little noise, and the centrifugal fan with front plate type blade is noisy.

(2)通风机的工作点应接近较率点。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，其设置的较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。

(2) the working point of the ventilator should be close to the highest efficiency point. The same type of ventilator is getting higher and higher, and the noise is smaller. In order to maintain the operating point of the fan in the high efficiency area of the fan, try to avoid using the valve to adjust the working condition. If the valve must be installed at the outlet of the fan, the best location is to 1m away from the outlet of the fan. It can reduce the noise below 2000Hz. The air flow should be kept uniform at the entrance of the ventilator.

(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 fan properly under possible conditions. The rotary noise of the fan is proportional to the 10 times of the circumferential speed of the impeller, and the eddy noise is proportional to the 6 power (or 5 power) of the circumferential speed of the impeller. So reducing the speed can reduce the 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。

(4) the noise level of the inlet and outlet of the fan increases with the increase of ventilation and wind pressure. Therefore, when designing the ventilation system, the pressure loss of the system should be minimized. When the total air volume and pressure loss of ventilation system are 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 velocity of the airflow in the pipeline should not be too high, so as not to cause regenerative noise. The flow velocity in the pipeline should be selected according to different requirements according to the 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较小，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 of the ventilator and the motor. The fan with direct connection drive is the least noise, followed by the coupling and slightly worse with the no joint triangle belt drive. A low noise motor should be used for the ventilator.

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