Patent GB-464323-A (GB)
Title: Improvements in and relating to power plants
IPC: F02C5/12
Filed: 1936-09-30
Abstract: 464,323. Gas turbines. LASLEY, R. E. Sept. 30, 1936, No. 26560. [Class 110 (iii)] [Also in Group XII] A gas-turbine plant comprises a turbine 72 which drives a main compressor 32, in which fuel gas and air are fed to companion low and high pressure cylinders 1, 2, and charges of air delivered under high pressure from cylinders 1 to cylinders 2 when explosions occur in the low pressure cylinders. The number of stages of compression may be more than two. For starting purposes a blower 31 is driven by an electric motor through a shaft 33, and air is supplied through a pipe 34, past a regulating valve 36 to a manifold 11. Thence the air is led through a neck 22 past a valve 29, Fig. 4, to a low pressure cylinder. When the main compressor 32 delivers air at pressure through a pipe 37 to a manifold 10, a valve 14 is forced back to close the air supply through pipe 34. An electric contact 19 is thus broken, and the motor driving the shaft 33, is stopped. The contact 19 may be made manually. Air supplied to each cylinder 1 is mixed with fuel fed in from a pipe 51 past a non-return valve 50, which passes through holes 52<1>, and the mixture is fired in the chamber 44 by means of a sparking plug 93. The products of combustion leave through flared holes 43 and drive the air contained in the chamber 45, through a perforated disc 46, past the valve 7, Fig. 2, to the high pressure cylinder 2. The force of the explosion in a chamber 40 seats a valve 55 and at the same time opens a valve 58 against the pressure of a spring 59. Air enters through a port 61, passes the valve 58 and proceeds onwards through channels 63 which lead to an inlet pipe 70, which feeds the turbine 72. A pipe 68 leads gases from the chamber 40 into a pipe 66, and a further pipe 68<1> leads gases from the adjacent high pressure cylinder 2. Air is induced into the spout 67 by the gases. The turbine drives a power shaft 73. A rotary distributer 76 supplies fuel to pipes 51, 75, leading to the L.P. and H.P. cylinders respectively. A shaft 77 upon which the distributer nozzle 76 is mounted, is driven through gearing 78 from a shaft 79. The latter is rotated by means of air flowing from the pipe 38, passing through diagonal holes in a rotor disc 80. When the starting compressor 31 is in action, air for the disc 80, passes through a pipe 83. A valve 82 is adjusted to allow the proper quantity of air to pass through the turbine 80 and also control the speed of the distributer 76. An ignition distributer 89 is also driven by the shaft- 77, to supply current to the plugs 93, 94. A tank 95 is a reservoir for compressed air and supplies a regulator 105 which receives fuel gas from a carburetter by way of a pipe 106. A delivery tube 107 leads to the distributer 76. A control valve 105f, Fig. 8, is attached to a lever pivoted at 105<i> which is controlled in turn by a diaphragm 105<k>. Air under pressure entering the chamber 105<l> forces the diaphragm downwards and opens the valve. A stem 105<n> may be moved manually. In a modification, Fig. 5, the H.P. cylinders 109 do not have direct communication with the manifold. Air passes to each L.P. cylinder 110 through neck 115, and from the cylinder 110 to the cylinder 109, by way of a valve 113. A fuel tube 118 supplies fuel to a pipe 122 when a piston 124 is forced outwards by explosion pressure in the L.P. cylinder, and carries with it a valve block 121. A plunger 130 closes an outlet pipe 129 when an explosion in the chamber 127 forces a valve 140 on to its seat, and simultaneously a valve 141 is opened to admit air to the space S. The valve 140 and the plunger 130 are in the open position together. Fig. 9 shows a modification in which an atomizer 143 is provided for the L.P. cylinder. Fuel is supplied through a pipe 146, and air through a pipe 155. Some fuel passes through holes 149 in the web 148. The atomizer 159 for the H.P. cylinder 158, is provided with air and fuel pipes 173, 163, respectively. Perforation 171, 182, assist the mixing of air and fuel. Sparking plugs 153, 184, are energized alternately through a contact 190 which is controlled by the position of a valve 179. Fuel inlet pipes 164, 146, Fig. 10, which supply the atomizers, are fed by reciprocating plungers 202, actuated by pivoted arms 205, each having a roller in contact with a cam 208 or 209 keyed to a shaft 194. The arms 205 are secured to discs 206, 207. These discs can be adjusted, angularly, by rotation of wheels 217, 218, to rotate shafts 210, 211, and drive gears 213, 215. The air supply to the pipe 155, which leads to the L.P. cylinders, is controlled by a regulating disc 228, and a cap member 225 which is pressed into contact with the disc 228 by a spring 227. Elongated openings 229 in the disc 228 co-operate with openings 230 which are moved into. and out of registry with the openings 229. Teeth 231 on the disc 228 mesh with a gear 232 on the shaft 210. A further gear 234 controls the angular position of the ignition distributer 193. The disc 224 is moved intermittently by means of a resilient tongue 236, which rotates the disc, and spring pawls 238, having hooked ends which engage with projections on the disc. The disc is thus held stationary momentarily, until the pressure of the driving tongue 236, overcomes the resistance of the pawl.