Patent GB-331909-A (GB)
Title: Improvements in carbureters
IPC: F02M7/02
Filed: 1929-04-08
Abstract: 331,909. Claudel, C. H., and Soc. Anon. la Co-operation Agricole et Industrielle. April 8, 1929. Spray carburettors.-In a carburettor, Fig. 6, comprising a slow-running nozzle 1 and concentric intercommunicating emulsion chambers Cp, Cc for normal running and full throttle opening respectively, the nozzle ard chambers are supplied by separate ducts 9, 10, 11, into which fuel passes from the float chamber through removable submerged jets Gr, Gp, and Gc. The central nozzle 1 is surrounded by a guard tube 2 to form a duct Ca through which emulsifying air is drawn from a passage a, the air supply being controlled by a cock or spring-loaded beat valve. Primary air is also admitted through an orifice 26. The fuel supply ducts 9, 10, 11 are formed in a single detachable unit J. In a modified construction, Fig. 1 (not shown), the submerged jets are arranged near the base of the float chamber in a common transverse plane, the ducts 9, 10, 11, being formed in an integral portion of the carburettor body. In Fig. 8 the three jets are fitted at the base of a detachable ditfuser unit, which is fed by a common duct 27. In this construction the guard tube is omitted, but a manually operated air corrector device surrounding the diffuser unit is provided. Figs. 13, 15, 16, show a further modification in which the three jets are amanged external to the float chamber to facilitate removal. In Fig. 13 the jets Gr and Gp supplying the slow-running nozzle 1 and inner emulsifying chamber Cp are screwed into bores 64, 65, into which lead radial ducts 67. 68, from the sides of the float chamber. The fuel enters chambers 70, 72 formed in the interiors of the jets through lateral holes 73. 75, to supply, through orifices 61, 63, the ducts 9. 11, leading to the base of the slow-running nozzle 1, and to the outer emulsion chamber Cc respectively, the inner . emulsion chamber Cp being similarly supplied by the duct 10 (Fig. 13). In a modification (Fig. 17, not shown), the bore 64 may communicate with the duct 11 instead of being in direct communication with the floatchamber, the orifice 61 thus being placed in series with the orifice 63. Alternatively, the jet Gp may be supplied in series with the chamber Gc or the chamber Gc may feed the jet Gr. through the jet Gp, or the jets Gr, Gp may be supp'ied in parallel from the chamber Gc. Fig. 11 shows the invention applied to a horizontal type carburettor. The emulsifying air for the slow-running nozzle 1 traverses holes 6, the secondary air being supplied through a channel 31 provided with an adjusting screw 32. Additional emulsifying air may be admitted to a chamber 42 by removing plugs 43 or 45, the latter being replaced by a connection to a controlled external duct (Fig. 9, not shown). A duct 56 feeding the jet Gr may be plugged and be replaced by that shown by dotted lines 55, to provide a feed in series with the jets Gc. In each construction the throttle valve is of the form shown in Fig. 6, in which one edge is located close to the outlet from the slow speed nozzle; it is so shaped as to provide a more rapid opening in the neighbour. hood of the nozzle than at the opposite side of the induction passage. An inverted form of this valve is shown in Fig. 8. Specification 241,853 is referred to.