GB267559A - Method of supplying fuel to heavy oil motors - Google Patents

Abstract

267,559. LagardÞre. M. P. A. March 15, 1926, [Convention date]. Cylinders receiving liquid fuel; spray carburettors. - In two- or four-stroke heavy-oil engines of the type in which a rich mixture of fuel fog or mist with a small quantity of air produced outside the engine cylinder is supplied at low pressure to a chamber which is placed in communication with the working cylinder towards the end of an air-compressing stroke, the chamber is arranged within the head of the working cylinder. By this means it is easier to secure precise adjustment of the quantity of combustible admitted particularly when the quantity is small. In the two-stroke engine - shown, the scavenging air is compressed in the crank-chamber 1, provided with inlet valves 1<a>, and is transferred to the cylinder through a passage 2a and ports opposite to a deflecting surface on the piston 3 at the end of its outstroke. The exhaust ports ar shown at 4. The head of - the cylinder contains the chamber 6 adapted to be placed in communication with the interior of the cylinder by the opening of a valve 8 actuated by a cam 10<a> through a lever 9. Another valve 11 actuated by a cam 12a serves to admit the rich mixture of fuel fog or mist with air which is produced by forcing air through a nozzle 23 over the outlet of a nozzle 19 through which fuel is forced from a pipe 19<a> the quantity being controlled by a needle valve on a lever 20. An auxiliary pump 13 compresses air into a reservoir 14 whence pipes 15, 22 lead respectively to the fuel tank and to the air nozzle 23. The fuel tank is in two portions connected by cocks 17, 18 which permits of re-filling during working. A pipe 24 conducts the rich mixture to the valve 11. At the end of a working stroke, the valve 8 is closed, and shortly after this the valve 11 is opened to fill the chamber 6. When the compression pressure, due to the return of the piston 3, exceeds that around the valve 11, the valve 8 is opened and is closed again when the pressure in chamber 6 reaches or nearly reaches that necessary for self-ignition. Towards the end of the compression stroke, the valve 8 opens and the charge is injected into the working cylinder. The valve 8 may be kept closed during the whole of the compression stroke. The chamber 6 is provided with a liner 7 to maintain its temperature, and may also contain a heated resistance or a sparking plug to create an ignition point. The mist or fog may be produced in a carburetter with which is combined a pump either in front of the carburettor, or between the carburettor and the engine cylinder.