Combined adjusting method of water turbine

Abstract

The invention relates to a combined adjusting method of a water turbine. The method is characterized by the following steps that: the centrifugal pendulum which is at least comprised is driven by using a synchronous motor to be synchronously rotated with a set; the rotating speed of the set is measured; if the rotating speed is more than a set value, the power load of the set is reduced and the centrifugal pendulum operates a valve core of a guide vane pressure distributing valve to move downwards through a lever connection mechanism; the guide vane pressure distributing valve is connected with a guide vane servomotor; the guide vane pressure distributing valve operates the guide vane servomotor to reduce the opening degree of a movable guide vane; a feedback system is composed of a feedback rod, a hard feedback and a buffer; one end of the feedback system is connected with the guide vane servomotor and the other end of the feedback system is connected with the guide vane pressure distributing valve; the feedback system feeds the signal of the movable guide vane back to the guide vane pressure distributing valve; the valve core of the guide vane pressure distributing valve is moved by a combined mechanism connecting lever, a combined cam and an idler wheel through a connecting rod; and the vane pressure distributing valve operates the vane servomotor through a valve control so that the vane angle of a rotating wheel is adjusted to the angle corresponding to the opening degree of the movable guide vane. By using the combined adjusting method, the water turbine can obtain a stable performance.

Description

technical field [0001] The invention belongs to hydraulic mechanical engineering, in particular to a low water head turning paddle type water turbine association adjustment method. Background technique [0002] The regulation system of the low-head rotary paddle turbine is double regulation, that is, the movable guide vane of the turbine is linked with the runner blade. It has been proved by experiments and practice that the low-head turbine adopts double regulation, which can enable the turbine to obtain a wider high-efficiency area, improve the overall efficiency of the turbine, maximize the use of water energy, and obtain the maximum kinetic energy. The double adjustment is adjusted in this way: with the increase of the output of the unit, the opening of the movable guide vane increases, the application flow of the turbine increases, the angle of the runner blade increases, and the output of the unit decreases; vice versa; when the unit stops, the opening of the movable g...

AI Technical Summary

Problems solved by technology

This adjustment is well known, but there are two problems. It is correct to improve the efficiency of the turbine and obtain the maximum energy during normal operation and start-up. However, it is correct when the turbine is shut down or transitioned from power generation to phase modulation. The hydraulic turbine has a transition period from the working condition of the turbine to the working condition of the reverse pump and the phase modulation and compression. At this time, this adjustment: 1. During the period of shutdown or transition from power generation to phase modulation (phase modulation and compression), the turbine has In the working condition of the reverse water pump, in this case, the decrease of the opening of the guide vane, the decrease of the flow rate of the unit, and the decrease of the angle of the runner blades are the increase of the head of the reverse water pump, which becomes the cause of the shutdown of the vertical unit and the lifting of the machine during the transition process. The main factors, such as Gezhou generator set shut down and lift, and the Syrian Dishlin power station unit designed by our institute is lifted during the process of phase modulation and compression; increase the axial rear thrust of the horizontal generator set

Decrease the stability of the unit

2. At this time, the unit does not need to obtain a lot of water energy and needs to stop quickly or the transition process is completed quickly. According to the above adjustment, the movable guide vanes of the water turbine are all closed to 0 opening, and the runner blades will be reduced to the minimum angle position. Small, the turbine can get the maximum water energy in the process, which is not conducive to the reduction of downtime and transition time

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