GB241918A - An improved apparatus for generating a mixture of combustion products and air under pressure - Google Patents

Abstract

241,918.. Johansson, J. E. Oct. 22, 1924, [Convention date]. Two- and four-stroke engines. - Combustion products under pressure are generated in a plant comprising an internal-combustion engine 7, one or more air compressors 8 driven by the engine, and a receiver 9, the products expanded in the engine being mixed therein with air from the compressor to prevent an excessively high temperature of the resulting mixture. The exhaust valve of the engine is opened mechanically at the end of the expansion stroke when the pressure of the expanded gas is approximately the same as that of the compressed air, the stroke volumes of the compressor and the engine being such that the total volume of air taken in by the plant is at least 50 per cent greater than that of the air used for charging the engine only. In one form, Fig. 1, the engine 7 works on a four-stroke cycle. Air from the compressor 8 passes to a receiver 12 and is further compressed in the rear end of the engine cylinder 7, from which it passes to a receiver 13. Air is admitted from the receiver 12 to the engine 7 by a valve c and compressed, fuel is injected through a valve 14 at the beginning of the power stroke, and on the exhaust stroke the products of combustion are expelled to the receiver 9 through a valve b and a pipe 15, together with air admitted to the engine by a valve a from the receiver 13. In a modification, the air to be compressed in the rear end of the cylinder 7 is taken directly from the atmosphere instead of from the receiver 12, and steam may be admitted to the pipe 15 to lower the pressure. In another form, the engine works on a two-stroke cycle, air being compressed at high pressure into a single receiver by the compressor 8 and the rear end of the engine cylinder which act as single-stage compressors. Six-stroke engines.-In a further form, the separate compressor 8 is omitted and the first stage of compression takes place in the combustion chamber of the engine 7, which works on a six-stroke cycle; the second stage takes place, as in Fig. 1, in the rear end of the engine cylinder.