Patent GB-685603-A (GB)
Title: Improvements in or relating to apparatus for supplying combustible mixture to internal combustion engines
IPC: F02M1/00
Filed: 1949-07-05
Abstract: 685,603. Spray carburetters; vaporizers. CRAWLEY, F. A. July 5, 1949, No. 18303/48. Classes 7 (ii) and 7 (iii). A carburetter 1, Fig. 4, fed with air from outside the engine bonnet through a member 7 facing the direction of motion is fed with heavy fuel vapour at 42, exhaust gases at 11, 12, oil sump vapour at 201, the vapour from solid or viscous fuel at 48, and a mixture of fuel vapour, exhaust gases, and water vapour at 203, the resultant mixture flowing to the intake manifold 6 through orifices in heated plates 92, 91 and 89 in the carburetter outlet 85. A fuel tank 27, Fig. 1A, contains light fuel floating on top of solid or heavy fuel, the latter fuels being vaporized on flowing through a pipe 32, coiled around the exhaust silencer 33 and exhaust pipe 34 and leading to a port 35 in a vaporizer 2, Fig. 6, situated on and heated by the exhaust manifold 10, where its vapour may be mixed with light fuel vapour . supplied from tank outlet 28 by a pump 55 through pipe 56 to a float chamber 106 at the top of vaporizer 2. The light fuel escapes through an orifice 118 into a vaporizing chamber 119 from which the vapour escapes through orifices 120, 123, the mixture of light and heavy fuel vapours flowing through outlet 43 and pipe 41 to the carburetter nozzle 42. A second vaporizer 3, Fig. 5, contains solid or viscous fuel in a cylinder 104 heated by exhaust gases delivered through pipes 16, 17, 18, the fuel vapour being drawn through a pipe 49 leading to the nozzle 48. Water vapour from the radiator 22, the top of which is fed with air from a member 24, is heated in a coil 61 on the exhaust pipe 34, and supplied through a pipe 62 to port 103, Fig. 5, flowing through a coil 102 which opens into the space between casings 100, 104. Air is also delivered to the vaporizer 3 through pipes 66, 67 connected to cones 64, 65 facing the direction of motion, each pipe having a by-pass 69, 72 with exhaust-heated coils 68, 71 for heating some of the air. Light fuel from the tank outlet 28 may be fed to the vaporizer 3 through a by-pass 53b; and the mixture of light fuel vapour, exhaust gases and water vapour is delivered through port 209 and pipe 204 to the carburetter nozzle 203. The solid or viscous fuel. is inserted into the container 104 through an inlet 105 having a port 206 connected by pipe 80 to a pressure gauge 81 on the dashboard, and a vapour condensation pipe 36 is connected to the inlet 38 of a tank 40 supplying light fuel through a pipe 50 to the carburetter starting nozzle 52 controlled by a valve 99 actuated by a knob 76 on the dashboard. The engine is run solely on light fuel from nozzle 52 at starting until the vaporizers 2, 3, and the pipe 32 have been sufficiently heated. The light fuel from the tank outlet 28 is supplied to vaporizers 2, 3, during changeover to heavy fuel operation and during boost periods, the supply being shut off by cocks 53a, 56a, at other times. The jet discs 89, 91, 92 and the carburetter outlet 85 are heated by conduction from the exhaust manifold 10 through a phosphor bronze rod 88, a second heat-conducting rod 94 connected to the disc 92 extending adjacent the nozzle outlets and into the air intake 7 in which is screwed rings 95a .. c which are removable to vary size of the air flow passage. The carburetter inlet may be connected by a flexible hose to a conical air intake member 7a outside the radiator 22, and a pipe 45 leads from the carburetter mixing chamber to the inlet manifold 6. Electric heating coils may be fitted to the engine cylinder head and in the vaporizer 3 to obviate the necessity of using light fuel. The vaporizer 2 may be eliminated, the heavy fuel vapour from pipe 32 being delivered either direct to the carburetter or to a connection 250, Fig. 5 of the vaporizer 3. Where the device is used with a stationary engine, a fan forces air into the cones 7a, 64, 65, and 24. The invention may be applied to an existing carburetter, in which case the various connections shown in Fig. 4 are made to an adapter for use with the existing carburetter.