Patent GB-630145-A (GB)
Title: Improvements in silencing exhaust gases
IPC: F01N1/08
Filed: 1946-11-22
Abstract: 630,145. Silencing gaseous currents. TRIGGS, W. W. (Maxim Silencer Co.). Nov. 22, 1946, No. 34743. [Class 7 (ii)] In a silencer of the type that.is intended to be attached directly to the exhaust ports of an internal-combustion engine without the intervention of a manifold comprising a generally cylindrical casing 21, Figs. 1, 2, partition means, such as the arcuate member 23, extending transversely across the casing and longitudinally throughout its length so as to divide the casing into two adjacent chambers, for example inlet chamber 24 and outlet chamber 25 there is provided one or more inlet conduits 26 opening laterally of the casing into the inlet chamber 24 one or more outlet conduits 29 opening into the outlet chamber 25 as well as a plurality of transfer passages 28 extending through the partition and beyond the partition on both its sides into both of the chambers. In a modification, one pair of transfer conduits is dispensed with and a slotted and longitudinally disposed outlet pipe replaces the pipes 29. In a further modification, the transfer conduits, which are arranged so that they pass through the partition and yet remain nearly parallel to it, may either all open into the same end of the inlet chamber or two may open into the opposite end. In still another modification, five transfer conduits may pass substantially at right angles through the centre line of the partition ; one longitudinal outlet pipe is used. In another modification, the partition is a flat diametrically arranged plate in which are perpendicularly located three rows of eight transfer conduits ; the outlet pipe is T- shaped. In a further modification, three transfer conduits, which may open into the inlet chamber either toward or away from the direction in which the gases are introduced, are axially positioned through an ellipse-like partition that joins the inner ends of two oppositely curved longitudinal members that extend from opposite ends of the casing. In another modification, two oppositely curved plates which extend one from each end of the cylindrical casing and terminate a short distance from the other end, are not as wide as the diameter of the casing and therefore overlap at the centre to form a longitudinal transverse conduit. In a still further modification, Fig. 9, which is also stated to function as a spark arrester, the inlet chamber is comprised of a U- shaped member formed beneath a circular outlet chamber 58. The gases passing into the outlet chamber 58 are given a whirling motion by the tangential arrangement of two transfer conduits 59. Dirt particles are thrown outward and pass through a pipe 61 to a dirt container (not shown). The axial outlet pipe 62 is longitudinally slotted. In another modification, in which the dirt trap is dispensed with, the circular outlet chamber is transversely divided into two chambers and one perpendicular transfer conduit opens into the rear chamber whilst four longitudinal tubes connect the rear chamber to the front one which now constitutes the outlet chamber ; the outlet pipe is longitudinally disposed. In a further modification, two axial transfer conduits may pass through a diagonal partition in a cylindrical casing. U.S.A. Specification 2,297,046 is referred to.