Vertical plane interval regulating process for movable water-guiding vanes of water turbine

Abstract

The regulating process includes the steps of: turning the speed regulating ring to the position of 5-100% relative opening and fixing; connecting the speed regulating rings and water guide blade regulating levers successively, regulating to designed lengths and angles precisely and locking; closing all the water guiding blades to almost zero interval via the speed regulating rings; searching and precisely measuring the maximum interval; trimming to regulate the interval of the water guiding blades to the maximum interval; and closing the water guiding blades to zero, measuring and checking all the water guiding blade intervals. The present invention results in no damage to profile of the water guiding blades, makes the water turbine run smoothly and raises the water sealing effect of the closed water guiding blades.

Description

Technical field: [0001] The invention relates to a water turbine, in particular to a process for adjusting the clearance of the façade of movable water guide vanes of the water turbine. Background technique: [0002] The water turbine is equipped with 20 or 24 movable water guide vanes, and the movable water guide vanes are closed to cut off the water flow to realize shutdown, and the movable water guide vanes are opened to allow the water flow to enter the water turbine to make it run. By controlling the opening of the movable water guide vane, the speed of the hydroelectric generating set or the amount of load can be controlled. [0003] 20 or 24 movable water guide vanes must be opened or closed at the same time. After closing, the façade clearance between the movable water guide vanes must not exceed the technical specification requirements, and correct process methods are required to guide the adjustment of the façade clearance. [0004] The existing movable water guid...

AI Technical Summary

Problems solved by technology

[0008] 2. Because there is no operating standard to refer to when closing the movable water guide vanes one by one, after all the water guide vanes are closed, there is a large angle difference between each water guide vane

[0009] 3. Most of the other water guide vanes near the water guide vane with large gaps have zero gaps, and an appropriate number of nearby water guide vanes must be opened based on experience, and the existing large gaps are distributed to multiple water guide vanes. Gradually reduce the water guide vane gap until it is qualified

Because the water guide vanes with zero clearance are squeezed against each other and are tightly bound by steel wire ropes, the operation is very difficult and laborious

Even if you have a lot of practical experience, it is inevitable that you need to make repeated careful adjustments to meet the requirements of the gap.

[0010] 4. Due to the lack of measures to ensure that the angle of each water guide vane is consistent with the opening between adjacent water guide vanes, it will cause uneven distribution of water flow angle and flow circle entering the turbine, and artificially increase the uneven operation of the hydroelectric generator set. Stability factor

[0011] 5. Due to the angle error of the water guide vane, the sealing surfaces of two adjacent water guide vanes with a width of several tens of millimeters cannot form surface contact, which reduces the water sealing effect when the water guide vane is shut down during shutdown, and may easily cause the sealing surface of the water guide vane Damaged by high-pressure jet cavitation caused by water leakage