降低通風機聲源噪聲有哪些方法？

發布人：http://www.bnlfans.net   發布時間：2018-04-24 19:02:09

(1)合理選擇通風機的機型。在噪聲控制要求高的場合，應選用低噪聲通風機。不同型號的通風機，在同樣的風量、風壓下，機翼型葉片的離心通風機噪聲小，前向板型葉片的離心通風機噪聲大。

(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)通風機的工作點應接近較率點。同一型號的通風機效北越高，噪聲越小。為使通風機的運行工況點保持在通風機的率區，應盡量避免用閥門進行工況調節。如必須在通風機壓出端設閥門時，其設置的較佳位置是距通風機出口1m處。它能使2000Hz以下的噪聲降低。在通風機入口處氣流應保持均勻。

(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)在可能條件下適當降低通風機的轉速。通風機的旋轉噪聲與葉輪圓周速度10次方成比例，渦流噪聲與葉輪圓周速度6次方(或5次方)成比例。故降低轉速可降低噪聲。

(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)通風機進、出口的噪聲級是通風理、風壓增加而增大的。因此，設計通風系統時，應盡量減少系統的壓力損失。當通風系統的總風量和壓力損失較大時，可將其分為小系統。

(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)氣流在管道內的流速不宜過高，以免引起再生噪聲。確定管道內氣流流速應根據不同要求按有關規定選取。

(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)注意通風機與電動機的傳動方式。采用直聯傳動的通風機噪聲較小，用聯軸器的次之，用沒有接縫的三角皮帶傳動的稍差。通風機應配用低噪聲的電動機。

(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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