| 摘要 |
A vent silencer including an outer housing having an inlet and an outlet, and a divider plate is disposed within the housing and divides the housing into an upstream inlet chamber and a downstream chamber. Located within the inlet chamber and communicating with the inlet is a primary diffuser, while a series of parallel perforated tubes are located within the downstream chamber and a sound absorbing material is packed around the tubes. The upstream ends of the tubes are closed and project beyond the plate into the inlet chamber. The sound energy is attenuated in passing from the primary diffuser into the inlet chamber and further attenuation is achieved as the sound energy passes through the perforations into the projecting ends of the tubes.
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