GB288195A - Improvements in carburetting apparatus applicable for internalcombustion engines - Google Patents

Abstract

288,195. Schuddig, C. W. April 4, 1927, [Convention date]. Vaporizers, external; spray carburettors. - Heavy fuel is heated, atomized, mixed with air, passed through a tortuous passageway to which further air is admitted, and then passed through a vaporizer in which the heavier particles of fuel are separated and vaporized before returning to the mixture stream. Fuel is supplied, preferably under pressure, to a pipe 10 provided with a nozzle 25 and passing through a conduit 27 to which air is admitted through apertures 19 controlled bv an adjustable plug 20. The conduit 27 is carried by a plug 14 adjustable in the body 12, and is provided with a projection 41 and a baffle 36 between which are situated apertures 37, and with a second projection 40 and a baffle 35 carried by pins 42 above the outlet 28 of the conduit. The projections 40, 41 co-operate with projections 43, 44 in the body 12 to form a tortuous passageway, the size of which can be altered by adjusting the plug 14. The fuel nozzle 25 projects into a recess in a plug 26, which is surrounded by air inlets 30 controlled by a ported plate 31. The apparatus is provided with an exhaust jacket 61 extending at 60 around a vaporizer 63 which is provided with a series of rings 64 of increasing size secured together at points around their circumference. The outlet 71 of the apparatus is provided with a throttle valve 72 and with an inlet 74 for light fuel mixture, a valve 73 interconnected with a cock on the fuel tube 10 determining whether light or heavy fuel mixture is supplied. Instead of using light fuel mixture for starting, the vaporizer may be heated electrically or by a burner. A filter comprising an inner coarse screen and an outer fine screen may be provided in the fuel inlet pipe. In action, the fuel is heated in passing to the nozzle 25, is atomized by contact with the plug 26, mixed with cold primary air admitted through the inlets 30 and with heated secondary air admitted at 28, and then passes through the tortuous passageway to the chamber 53, further heated air being admitted through the perforations 37; the swirling mixture then enters the vaporizer 63, the lighter particles passing straight through the rings 64, whilst the heavier particles are thrown out by centrifugal force into contact with the hot wall and when vaporized pass through the spaces 67 between the rings into the mixture stream. To prevent knocking, exhaust gases may be admitted to the outlet 71 through an aperture 63<a>.