GB196333A - Improvements in or relating to internal combustion engines - Google Patents

Abstract

196,333. DeppÚ, W. P. Dec. 21, 1921. Spray carburetters; vaporezers, external. - A mixture of air and fuel is rendered homogeneous by mechanical means, is heated gradually to a temperature above the vaporizing or boiling points, but below the cracking or dissociating points, of the fuel constituents, the values of such limiting temperatures being those which apply when the fuel is under the conditions of pressure and admixture with air which exist during such heating, and predetermined amounts of hot exhaust gases are then introduced into the mixture, the temperature of which is gradually increased on its way to the combustion chamber, where it is compressed to a pressure and temperature just below the ignition point and then fired. Fuel is supplied to nozzles 3, 4 provided with smaller orifices than usual, heated primary and secondary air is supplied through pipes 8, 14, controlled respectively by valves 7, 12, from jackets 9, 15 surrounding the exhaust pipe 10, and the mixture passes through a choke-tube 16 provided with a centrally-opening throttle valve 17, as described in Specification 11222/15, to a chamber 20 containing a rotary mixer 21; the mixture then passes through an annular conduit 24 formed between inner and outer chambers 25, 27 supplied with exhaust from the exhaust manifold 30 through pipes 29, 31, the chamber 25 being provided at the top with perforations 52, Fig. 2, or a nozzle 53, Fig. 1, to admit a predetermined amount of exhaust gas to the mixture. The intake manifold comprises a curved portion 84 connected at its end 35 with a pair of downwardly-extending flattened sections 36 opening into chambers 37, each of which covers three of the intake ports 38. The sections 36 are surrounded by flattened portions 39 of the exhaust manifold 30 which is provided at the top with an outwardly-extending portion 42 which covers the curved portion 34 of the intake manifold, and opens into a semi-circular portion 44 leading to the exhaust pipe 10. Exhaust gases may also be introduced into the primary and secondary air inlets through pipes 54, 55; into the mixture just above the throttle valve through pipes leading either from the exhaust pipe 10 or from the chamber 27; and into the top and bottom of the sections 36 of the intake manifold through holes or nozzles 61, 62, Fig. 2. Specification 130,209 is referred to.