| 摘要 |
426,575. Exhaust and like silencers. BLUNDELL, A., 361, Walsgrave Road, Coventry. Dec. 7, 1933, Nos. 34392/33 and 15732/34. [Class 7 (ii)] [See also Group XXI] Silencers for the air or gas intakes or the exhaust of internal-combustion engines, also applicable to intakes and outlets of air and gas compressors and to firearms, are composed of or include one or more tubular elements formed by spirally winding a metal strip of a cross section such that the edges of adjacent convolutions interlock with, but are free to move axially relatively to, one another. The strip is preferablyof Z- or S-section so as to form a continuous spiral passage a<5>, and may be perforated as at a<4>. The coiled elements may be combined with a perforated tube placed internally or externally, with or without a winding of asbestos cord or tape, or a layer of wire mesh ; or there may be two concentric coiled strips with asbestos cord incorporated between the convolutions. Fig. 10 shows a carburetter intake composed of a series of coiled elements A open to the air at their free ends, their other ends being connected to a chamber d with a socket d<1> for connection to the carburetter. The elements A may be held together by a plate e and surrounded by a casing of wire gauze f. For silencing exhaust gases, an element may form the tail pipe of an ordinary expansion chamber, or inlet and outlet elements A, A<1>, Fig. 13, may enter from opposite ends of an expansion chamber g so as to give the gases a tortuous path before entering the outlet chamber g<1>. Or the expansion chamber to which the elements are connected may itself be formed of coiled strip in the same way as the elements. One or more coiled elements may also be provided between the exhaust manifold and the exhaust pipe, in addition to the usual silencer at the tail end. |
