| 摘要 |
In the silencer (30) of the present invention, a cylindrical porous plate (34) is provided on the outer circumferential side of a path forming component that forms a sound absorption path. The porous plate (34) has a plurality of micro holes penetrating it in the thickness direction. By forming the plurality of micro holes on the outer circumferential side of the porous plate (34), sound generated by the air flowing along the sound absorption path is attenuated without any sound absorption material being used. The porous plate (34) is formed from metal. As a result, there is no source for generating for dust and dirt such as sound absorption materials formed, for example, from connected foam resin and fiber. Accordingly, it is possible to reduce sound that is generated by the flow of air while also reducing the creation of dust and dirt.
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