| 摘要 |
1,162,939. Gas turbine plant. DAIMLERBENZ A.G. March 7, 1968 [March 9, 1967], No.11166/68. Headings F1G and F1T. The invention relates to a gas turbine engine for driving a vehicle, the engine comprising two useful power turbines, one being a starting turbine and the other a normal operation turbine, the normal operation turbine being secured on a shaft, and the starting turbine being connected to the shaft through a freewheel drive. Combustion gases are supplied through a duct and are directed either to the starting turbine or to the normal operation turbine by a valve device. In the embodiment shown, a normal operation turbine 14 is secured on a shaft 12 which is rotatably supported by bearings 16, 17 within a casing, the shaft having a flange 18 for connection to an output shaft. A starting turbine 13 is mounted on the shaft 12 by means of a freewheel device 20. Combustion gases from a gas generator, not shown, pass to a duct 32 which divides into two branches 33, 34, the branch 33 leading to volute 30 from which gases may pass through inlet guide vane assembly 28 to drive the starting turbine 13, and the branch 34 leading to volute 31 from which gases may pass through inlet guide vane assembly 29 to drive the normal operation turbine 14. The gas flow either to branch 33 or to branch 34 is controlled by a flap valve 35 pivotally mounted at 37 and controlled in dependence on speed of the shaft 12 by means of centrifugal device 38 and actuating linkage shown. The arrangement is such that at zero and low speeds of the shaft 12, the valve member 35 is positioned as shown so that gases pass to the starting turbine 13 which has high torque at low speeds, while when the shaft reaches a predetermined speed the device 38 causes the valve member to move to the other position shown by chain line so that the gases now pass to the normal operation turbine 14 which thus takes over the drive, the starting turbine coming to rest. The two turbines discharge into a common outlet chamber 23. |
