GB124061A - Improvements in Carburettors for use in connection with Internal-combustion Engines. - Google Patents

Abstract

124,061. Cox, A. March 16, 1918. Spray carburettors.-The nozzle discharges into a branch passage which conveys the primary air and fuel into a main air passage, and the fuel delivery from the nozzle is varied by regulating an admission of air to the branch passage between the nozzle and the main passage. The nozzle d, the outlet area of which may be adjusted by a valve g but does not vary with throttle movement; discharges into the Venturi-shaped branch passage c which delivers at c<3> into a constricted portion b<2> of the main induction passage which has an air inlet a<1> and is controlled by a rotary plug valve b. The valve which controls the depression in the branch c, and therefore the fuel delivery, comprises a rotary ported sleeve e adjustably connected to the throttle valve by a slot and screw e<4>. The ports e<2> which may be pearshaped are closed as the throttle is opened, and vice versa. The constriction b<2> may be located otherwise than in the throttle plug, e.g. between the air inlet a' and the plug. In a modification, the branch passage enters the main passage between two butterfly throttle valves which are adjustably interconnected by a link which actuates the depression-control'ing valve. According to further modifications, (1) the depression oontrolling valve e may be adjusted independently of the throttle valve by a Bowden or like control, which is particularly advantageous in connexion with aeronautical engines for varying the richness of the mixture and facilitating starting; (2) the valve e may be formed integral with the throttle; (3) it may be of slide or other form; and (4) the branch passage may enter the main passage at any angle.