STEAM TURBINE CONTROL DEVICE Russian patent published in 1997 - IPC

FIELD: turbine manufacture and control. SUBSTANCE: steam is first supplied through steam-distributing nozzles, then through throttles, and after that again through nozzles. Device has pressure transformer 2, servomotors 5 and 6 hydraulically interconnected by high- and low-pressure oil lines 80 and 85 and pulse lines 83 and 84, as well as feedback control valves 7,8 of servomotors 5 and 6. Steam distribution nozzles 9 and throttles 10 are linked in pairs by lever transmissions 71, 72 with servomotors 5,6. Control valves 93-97 of nozzles 7 are connected through channels 99-103 to nozzle assembly 106 placed in turbine casing 91; control valves 98 of steam-distribution throttles 10 are connected via channels 104, 105 to nozzle assembly 106 located in turbine casing 92. Feedback control valve 8 of servomotor 6 has additional port 62 communicating with pulse line 83 and with line 85; control ports 19,20 in pressure transformer 2 communicating with pulse lines 83, 84 are spaced from control edges of bottom and middle pistons of control valve 11 at different distances. Feedback control valve 7 of servomotor 5 may have additional port 59 hydraulically connected between first additional port 62 and line 85. Pulse line may be connected to end box 67 of feedback control valve 8 of servomotor 6. EFFECT: improved reliability of turbine control. 3 cl, 2 dwg