First, the sound source analysis:

Fan is divided into axial, centrifugal, mixed flow and other models. Widely used in industrial and mining enterprises, civil buildings, wall ventilation, post air supply, pipeline ventilation, roof ventilation, in the chemical industry, light industry, food, medicine, metallurgy, power plants and other industries and civil construction in large quantities.

Its noise is dominated by aerodynamic noise, in which the noise of the centrifugal fan machine is mainly low frequency and decreases with the increase of the frequency. The axial fan is dominated by the intermediate frequency noise.

The noise management is divided into sound source management and propagation path management. The former mainly on the fan impeller, blade, shell, support structure and the use of materials to improve, to reduce the fan's own noise, which mainly use muffler, acoustic enclosures, sound-absorbing walls and other noise products from the fan noise The noise on the transmission path is governed by the transmission path.

Second, the noise control measures:

1, in the fan inlet and outlet pipes on the installation of muffler

2, in the fan unit installed outside the sound cover

3, to take the transformation of the fan room of the comprehensive management measures.

If there is a special fan room, you can combine the scene to take the fan room into a noise reduction between the noise method, that is, the fan unit closed in the engine room so that the noise does not pass out, so the room noise is large, but External noise is much smaller. Sealed room to be set into the exhaust system, while equipped with silencer device for the ventilator sound and motor, chassis and other cooling needs.

Noise control requirements are high, you need to take the same time vibration, vibration isolation, sound absorption and sound insulation and other measures to comprehensively control the mechanical noise, vibration and electromagnetic noise in order to get a satisfactory noise reduction effect. www.ad34.cn