| 摘要 |
PURPOSE:To prevent the occurrence of a reversible phenomenon in a turbine as well as to aim at miniaturization of a turbine brake, by regulating opening of a deflector according of a needle, while avoiding a collision of the jet deflected by the deflector to a bucket, in time of discharge operation CONSTITUTION:In time of discharge operation, a select switch 19 from generating operation to this discharge operation and vice versa is connected to a contact (b), and a signal out of a needle opening detector 16 and a signal out of an electric governor 13 are inputted into a needle-deflector tracking device 20b in time of this discharge operation, thus signal processing takes place. These signals are converted into a control signal at a converter 21, through which a deflector distributing valve 22, and according to the opening, a deflector servomotor 10 is controlled. And, a full-open position of a water receiving surface of a deflector 9 is changed according to opening of a needle 7 in time of the discharge operation of the deflector 9, namely, a diameter (d) theta of a jet 3. With this constitution, the jet sprayed out of a nozzle 2 is deflected so as not to hit a bucket after colliding with the deflector 9 so that a reversible phenomenon in a turbine runner is made preventable. |
