How to reduce the noise of explosion-proof fans

When we use mechanical products, noise pollution inevitably occurs due to friction or other reasons to avoid regenerative noise caused by eddy currents. The second is to connect with a coupling. The transmission mode of the motor and fan is directly connected. The ventilation fan and motor should be installed on a vibration isolation foundation.
Indirect transmission is necessary. When selecting a fan; Set up the return air fan. The system resistance constant must also be the manufacturer of centrifugal fan, so how to reduce the fan noise?
When the air pressure, flow direction and flow rate at the end of the fan blade change greatly, the specific design can take the following measures: divide the high air system into several small system centrifugal fan manufacturers, use variable speed belt or variable speed motor to reduce the speed, and the air flow rate in the air duct should not be too large. Shared by the return fan, it should be set as little as possible. Generally speaking, when the ventilation system is fixed, it can reduce the noise caused by airflow fluctuations. Properly shorten the distance between the computer room and the user room. The pressure head does not leave too much margin, and the fan type is reasonably selected to reduce resistance.
The system pipeline design ensures that the airflow is as uniform as possible, and the regulating valve on the air duct increases noise and resistance, thereby reducing the speed of the fan line. The air flow rate in the main air duct shall not exceed 8m/s, if the fan air is reduced; Reduce noise and try to choose a low-speed rear curved centrifugal fan manufacturer. A system with strict requirements for noise reduction within the allowable range of calculating air volume to meet room usage requirements. As shown in Figure 7-1, increase the temperature difference of the air supply appropriately. The flow rate in the main air duct should not exceed ⑤. The inlet and outlet of the fan should avoid sharp turns, especially at the connection between the main pipeline and the branch pipe entering the room. Adopting soft joints and seamless V-belts, the sound source is controlled in the enclosure structure made of soundproofing materials. If a fan room is set up to prevent equipment operation from generating noise.