There are many types of fans in industry and civil construction, the most common is the centrifugal fan and axial fans. For the types and models of fans is different, the noise and frequency characteristics are different. But from the noise generation and mechanism, it is similar. There are four major components: aerodynamic noise at the intake and exhaust; mechanical noise at the machine Shell, piping, and the bearing ; Motor electromagnetic noise and the solid noise of the fan vibration through the base. In this four components, the aerodynamic noise at the intake and exhaust is the most serious which is about 10 ~ 20 dB (A) higher than the other components.
Muffler is the effective measure to reduce the noise radiation of air power equipment at the intake and outlets or the noise along the pipeline. Chassis and motor noise can be reduced by installation of acoustic enclosures. Except the noise reduction at the Fan outlet, according to the actual situation, the body noise of the fan and the vibration of the solid sound should also be emphasized.
According to the noise resource, noise characteristic , noise reduction requirements, process conditions, installation location and so on, we can design specially to reach a good muffler noise reduction effects. From air-conditioning ventilation systems to the fan , we all can complete very good.