Introduction and popular science of muffler
In a closed space such as a room or a sound insulation cabin, ventilation and heat dissipation are often required, and it is necessary to design an opening or duct for air exchange with the outside in the indoor space. The opening or the air duct not only realizes the airflow exchange between the indoor space and the outside, but also forms a channel for sound propagation with the outside. In order to ensure the requirements of the noise index of the used space, it is necessary to block the noise propagation caused by this. Devices that can not only allow airflow to pass through, but also effectively prevent or attenuate the propagation of sound energy, are collectively referred to as mufflers.
Both silencing and sound insulation hinder the propagation of noise by reducing the transmission of sound energy. Sound insulation is the way of blocking in the sound transmission path to achieve sound transmission loss, while silencing is the absorption of sound energy in the transmission path. Consume or reflect back and forth to achieve sound transmission loss.
If you want to meet the requirements for noise inside and outside the building, there are few civil or industrial technology rooms that have machinery and air-conditioning equipment that do not need a muffler. In the air conditioning and ventilation systems of large industrial enterprises, fans are often the most important source of noise. The entire ventilation pipeline system must be carefully designed and planned for noise reduction to ensure that the indoor and outdoor noise control acceptance requirements are met. In the air conditioning and ventilation system of civil buildings, careful noise reduction design must be carried out to ensure that the indoor noise meets the requirements of the design index for the use function. Therefore, mufflers are widely used in noise control technology and indoor acoustic environment design.