GB191015645A - Improvements in or relating to Steam Turbines. - Google Patents

Abstract

15,645. Procner, J. June 29. Regulating; exhaust, disposing of.-Exhaust steam, from a turbine in which the number of stages is constant, is used in manufacturing processes, and the supply of steam is controlled by the pressure in the exhaust chamber and by a centrifugal governor, so as to keep the exhaust pressure constant whatever power is required from the turbine and however the demand for steam in the manufacture may vary. The whole or only a part of the steam may be controlled by the pressure - controlled and speed - controlled valves. The steam supply may be throttled, and multiple-ported valves may be used to supply a number of nozzles of the first stage of the turbine. As shown in Figs. 5 and 6, the steam from the pipe 10 passes to the turbine by ports of the piston valves 28, 37. The valve 28 is controlled by steam pressure of the exhaust chamber' acting upon the piston 15, which it depresses against the spring, and admits oil under pressure through the valve 19 to the cylinder 25, the piston of which is integral with the valve piston 29. As the pressure in the pipe 13 falls, the piston valve 28 admits steam to more ports, and thence to more nozzles of the turbine. The valve 37 is controlled by the governor 36 actuating an oil-valve 31 controlling the flow of oil to the cylinder in which the piston 34 moves, so that, if the speed of the governor increases, the ports to the turbine are closed and some nozzles put out of action. A throttle valve 39, also operated by oil controlled by a valve connected to the speed-governor, may be added. In a further modification, in order to meet a large demand for exhaust steam while small power is required for the turbine, part of the steam may pass directly from the steammain to the exhaust through a valve controlled by the exhaust pressure, and the whole of the steam to the turbine may be throttled by a valve controlled by the centrifugal governor.