GB1215148A - Exhaust gas processing system for internal combustion engines - Google Patents

Abstract

1,215,148. Treating I. C. engine exhaust gases; silencers. J. W. VON BRIMER AND H. P. ROTH. Dec.13, 1967 [Dec. 13, 1966], No.56669/67. Heading F1B. In an exhaust processing system comprising an exhaust pipe 10 with a partially flattened end portion 14, a reactor 16 having an air inlet port 18 at or adjacent one end and an exhaust outlet 20 at the opposite end, the exhaust gases flow into the reactor 16 through an elongated inlet port 26 such that the flow is directed substantially tangentially to its cylindrical inner surface and almost perpendicularly to its axis to produce a helical flow. The lowpressure created near the axis of the reactor 16 causes air to be drawn in through the port 18 and mixed with the exhaust gases. One or more ignition devices 28, e.g. spark plugs, glow plugs, hot wires or catalytic igniters, may be provided in the member 16. The area of the exhaust inlet port 26 may be varied by means of a valve (32), Fig. 4 (not shown), pivoted by means of an arm (36) with an adjustable weight (38) or a bi-metallic valve (40), Fig. 5 (not shown). The effective area of the air inlet port 18 may be varied by means of a valve (50), Fig. 6 (not shown), linked to a valve (42) in the exhaust inlet which is spring-biased to the closed position. In further modification, Figs. 7, 9, 10 and 11 (not shown), devices are provided for varying the flow through the air inlet port in accordance with the pressure within the reactor 16. The flow through the port 18 may be controlled by a valve plate (62), Fig. 8 (not shown), connected to a device, e. g. a bellows, subjected to engine intake manifold vacuum. Air may be added to the exhaust gases at the outlet of the reactor 16 by means of a perforated baffle (98), Fig. 12 (not shown), which directs the gases radially outwardly, a scroll-shaped member (106), Fig. 13 (not shown), with a central air inlet (110) or a Venturi formed by a jacket (120), Fig. 14 (not shown), and a baffle (114) at the reduced diameter reactor outlet (118). In a further embodiment, Fig. 15 (not shown), air is introduced into the reactor 16 adjacent the exhaust inlet port 26 and also along its length through a perforated pipe (124) extending through a baffle (126) at the reactor outlet. A plurality of reactors (132, 134, 136), Fig. 16 (not shown), each receiving exhaust gases from a cylinder or cylinders of the engine (130) may draw air from a common manifold and discharge to a common exhaust pipe (138). A first reactor 16 may discharge substantially tangentially into a second reactor (144), Fig. 17 (not shown), with an air inlet (146) and exhaust outlet (148). The air supplied to the inlet port 18 may be heated in a chamber (150), Fig. 18 (not shown), surrounding the reactor 16. The reactor 16 may be surrounded by a layer or layers of highly reflective metal and a layer (156), Fig. 19 (not shown), of fibrous mineral insulation and contain a helical baffle (158) of increasing pitch towards the exhaust outlet. Crank-case gases from the engine (159), Fig.20 (not shown), may be drawn into the reactor 16 through a pipe (166) connecting the crank-case to the reactor air inlet (164). In another embodiment, Fig.22 (not shown), the exhaust gases from the reactor outlet are directed to an outlet (180) in a casing surrounding the downstream end of the reactor in paths parallel to the flow through the reactor by a member (174, 176) in the casing.