Noise pollution is also an important factor of environmental pollution. People living near factories or roads will be more or less troubled by the noise of mechanical equipment and cars. Taking the noise pollution index as the index to assess the factory and living environment has long been included in the index of environmental protection standards by the state. Then, the equipment production supplier should also have the responsibility and obligation to reduce the noise pollution during the operation of mechanical equipment through technical means and better create a low decibel working and living environment.

空压机噪声的控制主要采用消声器、消声坑道和隔声技术三个方面：

The noise control of air compressor mainly adopts three aspects: muffler, silencing tunnel and sound insulation technology:

1、安装空压机消声器：主要噪声源是进、排气口，应选用适宜的进排气消声器。空压机进气噪声的频谱呈低频特性，进气消声器应选用抗性结构或以个、抗性为主的阻抗复合式结构。空压机的排气气压大，气流速度高，应在空压机排气口使用小孔消声器。

1. Installation of air compressor muffler: the main noise source is the inlet and outlet, and appropriate inlet and exhaust muffler shall be selected. The frequency spectrum of air compressor intake noise is low-frequency. The intake muffler shall be resistant structure or impedance composite structure dominated by individual and resistance. The exhaust pressure of the air compressor is large and the air flow speed is high. A small hole muffler should be used at the exhaust port of the air compressor.

2、设置空压机消声坑道：消声坑道的地下或半地下的坑道，坑道壁用吸声性好的砖砌成。把空压机的进气管和消声坑道连接，使空气通过消声坑道进入空压机。采用消声坑道可使空压机的进气噪声大大降低，使用寿命也比一般消声器长。

2. Set air compressor silencing tunnel: underground or semi underground tunnel of silencing tunnel, and the tunnel wall is made of bricks with good sound absorption. Connect the air inlet pipe of the air compressor with the silencing tunnel to make the air enter the air compressor through the silencing tunnel. The use of silencing tunnel can greatly reduce the intake noise of air compressor, and the service life is longer than that of general muffler.

3、建立隔声罩：在空压机的进、排气口安装消声器或设置消声坑道以后，气流噪声可以降到80db（a）以下，但空压机的机械噪声和电机噪声仍然很高，因此还应在空压机的机组上安装隔声罩。

3. Establishment of sound insulation cover: after installing silencers or silencing tunnels at the inlet and outlet of the air compressor, the air flow noise can be reduced to less than 80dB (a), but the mechanical noise and motor noise of the air compressor are still very high. Therefore, sound insulation cover shall also be installed on the unit of the air compressor.

4、悬挂空间吸声体：在空压机站，高大空旷的厂房混响很重。若在厂房顶棚分散悬挂吸声体，厂房的噪声可降低3-10db（a），混响时间降低5-10s。

4. Suspended space sound absorber: in the air compressor station, the tall and open workshop has a heavy reverberation. If the sound absorbers are dispersed on the roof of the plant, the noise of the plant can be reduced by 3-10db (a) and the reverberation time can be reduced by 5-10S.