Patent GB-175621-A (GB)
Title: Improvements in carburetters for explosion engines
IPC: F02M7/24
Filed: 1922-02-10
Abstract: 175,621. Brut, G. F. Feb. 17, 1921, [Convention date]. Spray carburettors.-Spraying of the fuel during normal running is effected by an injector comprising a tube or chamber open to the atmosphere and having an outlet nozzle which coacts with a constricted portion of the fuel nozzle, the fuel which accumulates in the tube or chamber during non-working being used up at starting. As shown diagrammatically in Fig. 1, the fuel nozzle n is supplied with fuel through a restricted orifice i, and is provided at the bottom with a constriction p which coacts with an injector nozzle k at the end of the tube l. In modifications, the fuel nozzle n, Fig. 3, which may be arranged axially in the induction pipe or situated, as shown, in the centre of the float chamber, is supplied with fuel through a passage g, chamber g, and orifice i. The injector nozzle p<1> communicates with the atmosphere through a conduit w, and one or more concentric tubes l'. Air inlets s may be provided in the nozzle n above the fuel level, and the chamber g may communicate with the space l through a conduit t. According to the Specification as open to inspection under Sect. 91 (3) (a), the injector tube, instead of being open to the atmosphere, may communicate with a chamber containing a pressure medium at a constant or variable pressure, which may be above or below atmospheric. In a further modification, the injector is situated above the normal fuel level, the injector tube being supplied with fuel, which may differ from that supplied direct to the nozzle, through a restricted orifice. This subject-matter does not appear in the Specification as accepted. Reference has been directed by the Comptroller to Specifications 16368/11, 14021/12, 11969/13, 17767/13, and 286/14. chambers according to the speed, and is drawn into the cylinder from these chambers on the inlet stroke. A series of discs l<1> - - l<4> are adjustably mounted on a tube o so as to form partitions dividing a vessel a into gas-tight chambers 1 - - 4. These chambers communicate with the tube o by ports p<1> - - p<4>, of which the ports p<2>, p<3>, p<4> are controlled by a valve q having ports r<2>, r<3>, r<2>, and actuated by hand or foot or a governor through a lever k, so as to bring one or more of the chambers into operation according to the speed. Admission to the cylinder by a pipe e is controlled by valve i, spring-loaded at s and opened by the engine suction or by a cam. The stem of the valve i is connected to a piston valve t having a port t<1> which communicates with the inlet t<2>, through which, when the valve i is closed, the fuel passes in the form of a spray and enters as many of the chambers 1 - - 4 as are open, afterwards passing from these chambers to the cylinder on the inlet stroke. In the case of a fuel which is not easily vaporized, a reservoir C, Fig. 8, jacketed with charcoal powder is supplied by a pipe e with gaseous fuel from the vessel a to be utilized for starting or, if required, during running. Further, the pipe leading from the fuel tank D to the vessel o is provided with a receptacle F containing a small reserve of petrol to make up for insufficient vaporization of the fuel at starting. An air-inlet orifice f, Fig. 1, is provided on the pipe e through which the fuel is drawn into the engine.