METHOD AND DEVICE FOR AUTOMATIC GOVERNING OF STEAM- TURBINE SPEED Russian patent published in 1998 - IPC

FIELD: steam-turbine speed control. SUBSTANCE: shaped concurrently with error signal is additional signal indicating difference between true pressure drop across throttle installed in outlet channel of pump coupled with turbine shaft and desired value. Additional signal is then transmitted to intermediate unit to reduce its value and if it exceeds desired value, error signal is used to correct it. Pump 22 coupled with turbine is used as high- pressure supply; intermediate unit is, essentially, flexible member, such as diaphragm 30, that forms, in conjunction with casing, cavity accommodating springs and that without springs; the former houses control spring 9 and adjusting spring 10. The latter mounts rod 12 installed in partition 32 which separates this cavity from valve cavity. Throttle 24 is installed in outlet channel of pump. Cavity 25 upstream of the latter communicates with cavity 13 and cavity 26 downstream of it communicates with cavity 11 and with pressure-reducing valve; inlet pipeline 2 of batching device is directly connected to valve mechanism. EFFECT: improved reliability and accuracy of speed governing, simplified design. 5 cl, 1 dwg