通風管道降低通風機聲源噪聲措施

發(fā)布人：http://www.rdhw.com.cn   發(fā)布時間：2017-07-27 16:53:30

(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) reasonably select the type of ventilators. In the case of high noise control, low noise ventilators should be selected. Different types of fans, under the same air volume and air pressure, the centrifugal fan of the airfoil type blade has little noise, and the centrifugal fan of the 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(qū)，應盡量避免用閥門進行工況調(diào)節(jié)。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. For the same type of ventilator, the higher the effect, the less noise. In order to keep the working conditions of the fan in the high efficiency area of the ventilator, it is necessary to avoid using the valve to adjust the working conditions. If you have to set the valve at the end of the fan, the best place for it is from the ventilator outlet 1m. It can reduce the noise below 2000Hz. Airflow should be kept evenly at the entrance of the ventilator.

(3)在可能條件下適當降低通風機的轉(zhuǎn)速。通風機的旋轉(zhuǎn)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(zhuǎn)速可降低噪聲。

(3) reduce the speed of the ventilator properly under the possible conditions. The rotating noise of the fan is proportional to the speed of the impeller 10 times, and the vortex noise is proportional to the speed of the impeller 6 times (or 5 times). Therefore, reducing the speed can reduce 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(tǒng)時，應盡量減少系統(tǒng)的壓力損失。當通風系統(tǒng)的總風量和壓力損失較大時，可將其分為小系統(tǒng)。

(4) the noise level of the inlet and outlet of ventilators is increased by ventilation and wind pressure. Therefore, the pressure loss of the system should be minimized when designing the ventilation system. When the total air volume and pressure loss of ventilation system are large, they can be divided into small systems.

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

(5) the velocity of air flow in the pipeline should not be too high, so as to avoid regeneration noise. Determine the airflow velocity in the pipeline shall be selected according to the relevant requirements according to different requirements.

(6)注意通風機與電動機的傳動方式。采用直聯(lián)傳動的通風機噪聲較小，用聯(lián)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 drive mode of fan and motor. The fan used for direct drive has the least noise, followed by couplings and slightly less with a triangle belt without seams. Ventilators should be equipped with motors with low noise.