GB447376A - Improvements in and relating to silencers for gaseous currents and the method of producing same - Google Patents

Abstract

447,376. Exhaust and like silencers. SERVAIS, N. H., 8, Old Pye Street, Westminster. Dec. 9, 1935, No. 34072. [Class 7 (ii)] A silencer for gaseous currents, e.g. the exhaust of an internal-combustion engine or the intake of a compressor, of the type comprising a casing provided with a filling of sound-absorbing material so arranged that there is left an unobstructed passage for the gases from the inlet to the outlet, comprises a casing containing a composite filling consisting of a comparatively fine fibrous or like sound-absorbing material, such as steel wool, glass wool, asbestos fibres, ordinary wool, or loose felt, and a more rigid material, such as expanded metal, wire netting, or wire gauze, the rigid material acting as a binding or lacing to hold the fibrous material together. The casing 10 has an inlet 11, an outlet 12, and a through passage surrounded by expanded metal 13 and steel wool 14 arranged in alternate layers so as to fill the remaining space in the casing. The filling is made by rolling one end of a length of expanded metal to form a tube, covering the remainder of the length with a layer of steel wool, and rolling up to form a roll adapted to fit in the casing. The fibrous material may be composed of strands of different thicknesses or differing otherwise. According to the Provisional Specification, the filling may consist of a series of annular wads of steel wool or of a corrugated roll of wire gauze.