Patent GB-599246-A (GB)
Title: Improvements relating to reciprocating-piston apparatus for compressing gases and delivering the compressed gases externally of the apparatus
IPC: F04B25/00
Filed: 1939-01-06
Abstract: 599,246. Air &c. compressors. PESCARA, R. P. Jan. 6, 1939, No. 516. Convention date, Jan. 6, 1938. [Class 8 (i)] A reciprocating piston apparatus for compressing gases and delivering the compressed gases externally of the apparatus, comprises at least two cylinders 1, 9, Fig. 1, of different volume disposed so that the piston of one cylinder is moving towards the cylinder head 1a while the piston of the other cylinder is moving away therefrom, a valve 10 permitting communication between the two cylinders during the time when the piston 3 of the larger cylinder 1 is moving toward the cylinder head, whereby gas is transferred to the smaller cylinder 9 at the Same time undergoing compression due to the different Volumes of the cylinders, the gas thus Compressed being externally delivered from the smaller cylinder during the succeeding stroke; and at feast one internal-combustion motor cylinder 2<1>, 2<11> which drives the pistons of the other cylinders. The large cylinder 1 works on a two-stroke cycle and the two internalcombustion cylinders 2<1>, 2<11> operate on fourstroke cycles 360 degrees out of phase. The downstroke of the piston 3 forces gas from beneath the piston 13 of the high-pressure cylinder 9 which is coaxial with the cylinder 1, through a delivery valve 11 and provides space in the cylinder 1 for receiving the burnt gases from one or other of the cylinders 2<1>, 2<11>, the gases being blown out to the atmosphere when the piston reaches air inlet-ports 7 near the end of its stroke. On its upstroke, the piston 3 forces air under pressure into the exhausted cylinder 2<1> or 2<11> and simultaneously effects a first stage compression of air which it delivers to the high-pressure cylinder 9 through the valve 10 to mix with air drawn into the top of the cylinder and passing through valves 17 in the piston 13. In modifications, the highpressure cylinder replaces one of the combustion cylinders and the other operates on a two-stroke cycle or two four-stroke combustion cylinders charge a smaller two-stroke compressor cylinder during part of their compression strokes. As shown in Fig. 5, large four-stroke compressor cylinders A, A' supercharge smaller combustion cylinders B, B<1> which on their compression stroke deliver part of their charge into a single high stage compressor cylinder C and on their exhaust deliver their combustion products through pipes 38 into the other large compression cylinder to aid the expansion stroke thereof and drive the piston downwards. The plant, Fig. 8, delivers simultaneously separate streams of compressed 'air and gases, two twostroke, low-pressure compressors D, D<1> delivering simultaneously to a high-pressure compressor cylinder E and to combustion cylinders F, F<1> which discharge their combustion products through outlets 43, 43'. In another form, a single large two-stroke low-pressure compressor cylinder discharges alternately into each of two four-stroke combustion cylinders which each deliver alternately air and combustion gases to a high-pressure compressor cylinder. In a further modification, the compressor delivers the charge into a separate reservoir to which the combustion cylinders also deliver part of their compressed air before fuel injection begins.