| 摘要 |
PURPOSE:To contrive to prevent vibration or the like from occurring by realizing no rotation of a secondary shaft during the stretch-out running of a primary shaft by a structure wherein a piping, which is arranged between an intermediate pressure turbine and a condenser and yet in which a damping valve is arranged, is provided in order to by-pass part of exhaust steam so as to lead directly to a condenser. CONSTITUTION:When a damping valve 16 is open under the condition that the steam, the quantity of which is only necessary for keeping a primary shaft I running at about 1,000RPM, is flowed through a high pressutre turbine 1 and an intermediate pressure turbine 2, a major part of the steam, by which the intermediate pressure turbine 2 is driven, is flowed through the damping valve 16 into a condenser 13, while part of said steam is flowed through low pressure turbines 4 and 5 into the condenser 13. Accordingly, the high pressure turbine 1 and the intermediate pressure turbine 2, both of which commonly drive the primary shaft I , are stretch- out-run at about 1,000RPM, while the low pressure turbines 4 and 5, which drive a seconary shaft II, exert no particular turning power, though they are heated by a small quantity of high temperature steam passing therethrough. Consequently, the stretch-out running can be performed without running the risk of rubbing vibration of the secondary shaft, which runs half times as fast as the primary shaft, and of the bending of a rotor and the like due to low speed running. |
