GB193612A - Improvements in carburettors for internal combustion engines - Google Patents

Abstract

193,612. Were, E. J. Jan. 13, 1922. Spray carburettors.-In order to obtain a continuous flow of fuel throughout the whole range of throttle opening and to provide for slow speed running, a main nozzle o and a regulating nozzle o<1> are located in the Venturi passage p on the engine and air inlet sides respectively of the throttle valve q. The nozzles are preferably diametrically opposite each other, as nearly as possible in a plane passing through the axis of the throttle, and in approximately equal cross-sectional areas. They are connected by passages m, n which may form bifurcations, at or just below the normal fuel level, of a fuel passage c controlled at the orifice d by a needle valve e. The junction of the passages is open to the atmosphere through a conduit m<1> which may be controlled. The nozzles are controlled by needle valves t and their discharge orifices preferably point in the direction of air flow. The float chamber a has a projecting ring i which passes over a cylindrical projection k on the carburettor body and is locked by a nut l. In a modification, the nozzle orifices are formed in perforated tubes carrying the needle valves. During slow running, fuel is delivered only through the passage m and main nozzle c, air being supplied through the regulating nozzle o<1> and passage n. As the throttle is opened, the suction on the main nozzle increases and on the regulating nozzle decreases; the suction at the orifice d is increased and a richer mixture is supplied through the nozzle o. Further opening of the throttle causes fuel to be delivered through the regulating nozzle o<1> and, when the throstle is fully open, both nozzles deliver approximately equal quantities of fuel.