Silencer for intake/exhaust gas duct

A silencer for an intake/exhaust gas duct having a duct casing wall defining an inside space over the entire length thereof with inlet and outlet openings, said silencer comprising noise-absorbing partition means extending through said inside space over the entire length of said gas duct in parallel with but spaced from said duct casing wall, said noise-absorbing partition means comprising a plurality of porous ceramic plates assembled side by side, said ceramic plates being provided with a plurality of minute apertures extending across the thickness of said plates;

• gas passage means extending in said inside space from said inlet opening to said outlet opening, said gas passage means having a sidewall, at least a major portion of said sidewall being said ceramic plates;
• noise-absorbing space means defined in said inside space adjacent said gas passage means with said noise-absorbing partition means disposed therebetween, said noise-absorbing space means being free of noise-absorbing material;
• noise-shielding plates disposed at inlet and outlet openings of said gas duct so as to close said noise-absorbing space means;
• and a plurality of gas chambers defined in said noise-absorbing space means by a plurality of noise-shielding sectional walls disposed in said noise-absorbing space means.