Water pump turbine and method of use thereof

Abstract

The invention relates to a pump turbine which comprises a volute casing, stationary guide vanes, movable guide vanes and a rotating wheel, wherein the rotating wheel is positioned in the middle in the volute casing; the stationary guide vanes and movable guide vanes are distributed in the volute casing; the movable guide vanes are distributed on the periphery of the rotating wheel; and the stationary guide vanes are distributed on the periphery of the movable guide vanes. The pump turbine is characterized in that a small guide blade is rotatably arranged between every two stationary guide vanes. When the pump turbine operates, the stationary guide vanes are kept stationary, the opening and closing of the small guide blades are utilized to control the flow entering the set, and the movable guide vanes can be adjusted to a reasonable angle so as to provide a reasonable attack angle for the waterflow entering the rotating wheel, thereby ensuring the stable flow in the rotating wheel and enhancing the efficiency and stability of the set.

Description

technical field [0001] The invention relates to a water pump turbine and a using method thereof, belonging to the field of fluid machinery. Background technique [0002] The structure of the existing water pump turbine is as follows: figure 1 As shown, it includes a volute 1, a fixed guide vane 2, a movable guide vane 3 and a runner 4. Among them, the volute 1, the fixed guide vane 2 and the movable guide vane 3 are used as the water guide mechanism of the pump turbine, which can form and change the circulation of the water flow entering the runner 4, and control the flow rate of the unit so that the water flow flows along the The circumference enters the runner 4 evenly. Since the fixed guide vane 2 needs to bear the axial load of the unit, its parts cannot rotate, so it can only be used as a fixed water guiding mechanism to initially form the circulation of the water flow entering the movable guide vane 3 . The movable guide vane 3 needs to adjust the flow through the u...

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Problems solved by technology

However, there is dynamic and static interference in the flow area between runner 4 and movable guide vane 3. Therefore, when the asynchronous guide vanes are put into operation, due to the asynchronous opening of the guide vanes, the water flowing into runner 4 cannot form a uniformly distributed circulation, which damages the runner chamber. The hydraulic balance between the runner 4 and the movable guide vane 3 will increase the dynamic and static interference between the watersheds, which will intensify the problems of pressure pulsation, noise and vibration inside the unit, increase the operation and maintenance costs of the unit, and also reduce them to a certain extent. The fatigue strength of the unit

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