As the impellers of a positive displacement blower rotate, they trap a pocket of air every time they pass by the inlet and discharge connection, creating a pressure pulse. This pressure pulse presents two issues:
- Pulsation causes vibration in the piping system
- The low frequency noise can be a nuisance or even a health concern for people in near vicinity of the blower
Blower silencers are used to reduce this noise and vibration. Silencers are typically placed at the blower’s inlet and discharge in pressure applications. For vacuum applications a silencer is typically used on the discharge only.
There are three basic types of silencers used to reduce the noise and vibration generated by the pressure pulse.