Patent GB-717425-A (GB)
Title: Improvements relating to power gas producers
IPC: F02C5/06
Filed: 1951-10-22
Abstract: 717,425. Gas turbine plant. BRIDLE, K. F. Oct. 15, 1952 [Oct. 22, 1951], No. 24575/51. Class 110(3) [Also in Group XXVII] An apparatus for producing combustion products under pressure or power gas comprises an air compressor and a motor for driving it, the compressor and the motor comprising a multiple piston and cylinder assembly in which a compressor piston is directly coupled to a driving piston which is of larger effective area and which is acted on by the power gas. Air from the com- 'pressor is delivered to a combustion chamber wherein fuel is burned to produce power gas, a portion of which passes to the motor driving the compressor, the remainder passing to an engine such as a turbine. The motor driving the compressor is mechanically independent of the engine. In Fig. 1, the compressor piston 13 is disposed in a cylinder 12 and the driving piston 11 in a cylinder 10, the two pistons being mounted on a rod 14. Air delivered by the compressor passes through the valve 17 to a reservoir 19 and thence to a combustion chamber 21 where fuel is admitted from the regulator 37, part of the resulting combustion gases passing through the pipe 22 to a turbine 23, and part passing through the pressure-regulated valve 26 to the valve cylinder 27 from which they pass to the working cylinder 10. The cylinder 27 contains a valve 29, 30 operated by means of a link 33 and abutments 34, 35 on the piston rod 14, and the valve controls admission of gas to, and discharge of gas from, the working cylinder 10. The piston 11 is returned to the top of its stroke by means of the spring 39. The valve 26 is balanced by means of the spring 40 acting on one side and the pressure of the power gas acting on the other side. Should the pressure of the power gas rise, the valve tends to close against the spring 40 and a less quantity of gas flows to the working cylinder. In the embodiment shown in Fig. 2 comprising two units A, B acting in opposite directions, air is compressed by the bottom side of the piston 45 and the power gas acts simultaneously on the upper sides of the two pistons 45, 46. Admission of gas from the combustion chamber to the working cylinders 42, 43 is controlled by the valve 48, 49, 50 disposed in the cylinder 27. When the valve is in the position shown, gas passes from the combustion chamber 21 through the .pressure-regulated valve 26 to the pipe 28 and manifold 47 to the two cylinders 42, 43, and at the same time gases from beneath the piston 46 pass through the manifold 51 and discharge to atmosphere through the vent 52. When the valve is moved to the right, gas from the combustion chamber passes through the manifold 51 to beneath the piston 46 so that the two pistons are moved to the top of their strokes, the compressor piston drawing in air through the valve 16; at the same time, exhaust gas from the top sides of the pistons 45, 46 passes through the manifold 47, pipe 28 and vent 31 to atmosphere. The pressureregulated valve 26 may be by-passed should it be necessary to produce power gas at a greater rate and a pressure-regulated valve is disposed in the duct from the combustion chamber to the turbine so that the flow of gas to the turbine is increased.