Water-spraying guide vane capable of improving deviation of optimum operating condition of water turbine

Abstract

The invention discloses a water-spraying guide vane capable of improving deviation of the optimum operating condition of a water turbine. The water-spraying guide vane comprises a guide vane body and a movable vane of a guide vane pivot. The guide vane pivot comprises an upper end shaft and a lower end shaft. Two parallelly arranged water-spraying grooves which are symmetrical to the central line of the blade profile of the guide vane are formed in the guide vane body, and a hole is formed in the shaft end of the upper end shaft and extends to the guide vane body to be communicated with the two water-spraying grooves in an open and close manner. On the premise of not changing the structure of an existing water distributor and the outer surface of the guide vane, a water-spraying guide vane runner formed by the one hole and the two grooves is processed in the guide vane just according to the dimensional size of the existing guide vane. When the vane deviates from the optimum operating condition, the hydraulic performance of the water turbine can be improved by spraying water. The water-spraying guide vane disclosed by the invention is suitable for a water guiding mechanism of a mixed-flow type or a runoff type water turbine, and is more remarkable in benefit to a large unit. The guide vane disclosed by the invention not only can be used for a novel unit, but also can be used for modification of an old unit of an existing power station.

Description

technical field [0001] The invention belongs to the field of mechanical design and manufacture, in particular to the field of design and manufacture of water turbines, and in particular to a guide vane and flow channel design technology for improving the performance of water turbines deviated from optimal working conditions. Background technique [0002] Both the mixed-flow and radial-flow turbines are equipped with a radial water guide mechanism, and the axes of the guide vanes are evenly distributed on the cylindrical surface concentric with the runner of the turbine, that is, on the distribution circle of the guide vane axes. The guide vanes of the existing hydraulic turbines are composed of a guide vane body with a ruled surface and a guide vane pivot with an upper end shaft and a lower end shaft. The number of guide vanes designed and the diameter of the guide vane axis distribution circle are relative to the diameter of the turbine runner. During the operation of the ...

AI Technical Summary

Problems solved by technology

The problem to be solved by the present invention is to provide a design structure of the guide vane of the water turbine, which can overcome the problem that the outlet angle of the guide vane does not match with the placement angle of the runner blade inlet when the mixed-flow or radial-flow turbine operates off the optimum working condition, resulting in hydraulic failure of the water turbine. Performance Degradation Defects

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