Patent GB-373976-A (GB)
Title: Improvements in carbureters
IPC: F02M7/02
Filed: 1930-11-27
Abstract: 373,976. Spray carburetters. CLAUDEL, C. H., Veuxhaulles, Cote d'Or, France. Nov. 27, 1930, No. 35736. Convention date, Nov. 27, 1929. Void [Published under Sect. 91 of the Acts]. [Class 7 (iii).] In a carburetter of the type described in Specification 331,909, [Class 7 (iii), Internal-combustion engines, Carburetting-apparatus &c. for], comprising three submerged jets Gr, Gp, Gc, Fig. 2, for idling, normal running, and for low speed running respectively, the jet Gp supplies a central emulsion-forming chamber 15, to which the engine suction is transmitted directly through orifices 8, Fig. 7, whilst the jet Gc supplies a concentric chamber 20 which communicates with the outlets 8 through the chamber 15 by means of orifices in the wall 1 separating the chambers. The jet Gr, which is in direct and unobstructed communication with the chamber 15, supplies fuel to a duct 22 having an outlet adjacent to an enlarged portion of the throttle valve 23 when the latter is in the closed position ; at small throttle openings a throttle duct 24 in the enlarged portion permits air to cross the outlet of the slow running duct 22 but as the throttle is further opened the inlet end of the duct 24 moves away from a recess 26 in the wall of the induction pipe and is obstructed by a projection 28; enrichment of the mixture results from the reduction of the air flow in the passage 24. A hot correcting fluid, such as hot air or exhaust gas may be admitted to the central tube 5 of the diffuser system whilst a suction-actuated ball valve (not shown) may control the admission of cold air through the base plug 7. The head of the diffuser is surrounded by a fixed or movable choke 11<1>; if fixed, as shown in Fig. 7, the main air supply is controlled by suction-actuated annulus or by balls 31 carried by a housing surround the choke 11<1>. Alternatively, the air passage 33 may be omitted, the choke being moved axially by suction to control the main air flow past the diffuser as described in Specification 342,685. In a modified construction the conical portion 34<1>, Fig. 10, of the diffuser head may be moved, manually or automatically, to control either or both the areas of the mixture outlet orifices 8 and the correcting fluid outlet from the tube 5. The invention is also described as applied to a horizontal type carburetter in which form of construction the mixture outlet to the choke tube is controlled by a freely pivoted arm arranged as shown in Fig. 14, the arm being raised from the end of the emulsion tube 1 by an amount dependent on engine suction. In each construction the three submerged jets are fed from a common float chamber containing a spherical float 29 which bears directly on the fuel inlet valve 30. A calibrated orifice 62, Fig. 2 is located in the passage connecting the jets Gc, Gp. The upper and lower portions of the carburetter, which are integral with the cover and float chamber respectively, are secured together by a bolt V which may be bored axially to accommodate the normal running jet tube 14, removal of which, in this construction, is effected by withdrawing it from the bolt V without removing the latter or otherwise dismantling the carburetter.