A pump-turbine unit for micro-head

Abstract

The invention relates to the technical field of pump turbines, in particular to a pump turbine set for a micro water head. The pump turbine set structurally comprises a pipe, and a generator motor and a pump turbine are horizontally installed in the pipe in a same-rotation-shaft mode. The pump turbine set simultaneously has two working conditions including water turbine electricity generation and water pump pumping, and a same rotation shaft meets requirements for water pumping and electricity generation. A micro-pressure type pump turbine runner with a spherical-surface-shaped hub and a thin-and-long warp-shaped blade is adopted, the chord lengths of the cross sections of the blade are gradually increased from the blade root side to the blade edge side, electricity generation or water pumping of the micro water head within the range of 0-2.5m is adapted, the runner and an inlet and an outlet of the pipe are optimized to enable the scope of a specific value of the length of the pipe to the diameter of the runner to be within 0.6-3, and the pump turbine set can be conveniently installed on a bulkhead gate or a riverbed. The pump turbine set is of an integrated structure, is convenient to produce and machine, brings convenience to set assembly, can simultaneously use water power resources of the micro water head and water pump energy consumption to water pumping and electricity generation of the micro water head, is simple in structure and low in construction cost, and enables the development on other projects to be avoided.

Description

Technical field [0001] This application relates to the technical field of water pump turbines, in particular to a water pump turbine unit for micro-head. Background technique [0002] From the perspective of water ecological environment, urban landscape water bodies, ecological rivers, and urban inland rivers, due to factors such as interception and storage, development and utilization, or networked river areas for flood control, etc., will cause poor fluidity and weakened river power. Turning into "dead water" causes the degradation of the water body's self-purification ability, and the deterioration of the environment cannot meet the ecological requirements. [0003] From the perspective of clean and renewable energy, micro-head hydropower (hydropower) is one of the best clean and renewable green energy sources that mankind has found so far. The national energy "Twelfth Five-Year Plan" clearly defines hydropower. Resource (hydropower) development is given priority. It is genera...

AI Technical Summary

Problems solved by technology

[0006] In the prior art, the Chinese invention patent application with the publication number CN102966563A discloses a high-efficiency water pump and power generation water wheel pump. Its structure includes a pump body, a generator and a pump shaft. The pump body includes a water wheel chamber and a pump chamber. , the pump shaft is divided into the first section shaft and the second section shaft, the upper end of the pump shaft is connected to the generator; the first section shaft is fixed with two impellers in the same direction, and the pump chamber is provided with a first water inlet and a first water outlet ; A special runner is fixed on the second shaft, and the installation direction of the impeller is opposite to that of the special runner. The pump body is provided with a water guide seat corresponding to the special runner, and the pump body is provided with a second water inlet for water to flow into the pump chamber. The bottom of the pump body is provided with a second water outlet. When pumping water, the river or tidal pumping station can be used to lift water to irrigate the farmland. When the slack farmland does not need water, it can be connected to a generator, and the generator can be directly driven by water energy. Power generation, although the overall structure is compact, easy to operate, reduce water flow loss, increase water head ratio, improve utilization efficiency, and have a wide range of applications; however, in the above technical solutions, the water pump and water turbine are set separately, resulting in a complex overall structure. High cost, not suitable for large-scale promotion and application

[0007] The runner of the pump turbine in the prior art generally includes an upper crown, a lower ring, and blades arranged between the upper crown and the lower ring, and can only be applied to a capacity-intensive pumped storage power station with a water head ranging from 4 to 600 m. It cannot be applied to pump-turbines with micro-heads that are not energy-intensive, and its structure is relatively complex, bulky and heavy

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