GB124202A - Improvements in Governing Mechanism for Compound Engines. - Google Patents

Abstract

124,202. British Westinghouse Electric & Manufacturing Co., (Assignees of Hodgkinson, F.). July 10, 1917, [Convention date]. Motor power plant; regulating. -Relates to governing means for compound engines or turbines, and comprises means responsive to variations in the speed of the high-pressure section for controlling the operation of the lowpressure section and means responsive to variations in the speed of the low - pressure section for shifting the function of governing the low-pressure section from the first to the second of said means. For example, in a turbo-generator installation, Fig. 1, comprising a high-pressure turbine section 10 and two low-pressure turbine sections 11, 11<1> connected in parallel, in the event of an accident unloading say the section 11', the sections 10, 11 continue in operation under load under the control of the governor 15 of the high-pressure section, while the section 11<1> is automatically isolated by a governor 22, which is adapted first to cut off the fluid supply coming from the section 10 by closing a gate valve 20 when the speed of the section 11<1> becomes excessive, and then to admit sufficient live steam through a valve 23 to keep the section 11<1> running at. normal speed. Excess fluid from the section escapes through a relief valve 28<a>. A modification is described wherein a high-pressure turbine is connected in series with a duplex low-pressure turbine by a conduit having a gate valve such as 20. An application of the invention to the turbine described in Specification 17643/14 is described, and in this modification, the gate valve may be closed by the governor of the initial section. The control of the gate valve may be effected by a governor 37a, Fig. 4, controlling a pressure-actuated device 39, Fig. 6, and a trip mechanism 43, Figs. 4 and 5. Mounted on the governor lever 37<b> is a finger 47 adapted to release from a latch 46 a trip lever 45 and so allow a valve 44 to open and permit the space below a differential piston 60 to be exhausted. The piston 60 thereupon shifts a valve 52, admitting pressure fluid below a piston 49 which thereupon shuts the gate valve mounted on its rod 50. For subsequently opening the valve admitting highpressure steam to the low-pressure section, the governor 37a is connected thereto through a relay.