Mixed-flow water turbine runner with double flow channels on outlet

A hydraulic turbine and Francis flow technology, which is applied in the field of outlet dual-channel Francis turbine runner, can solve problems such as the failure of the unit to operate normally, and achieve the effects of ensuring flow uniformity, increasing pressure, and ensuring uniform distribution.

Inactive Publication Date: 2015-08-19
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the water turbine units of China's Yantan and Pakistan's Tabela Hydropower Stations experienced strong vibrations when they were operating in unstable areas, resulting in the failure of the units to operate normally.

Method used

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  • Mixed-flow water turbine runner with double flow channels on outlet
  • Mixed-flow water turbine runner with double flow channels on outlet
  • Mixed-flow water turbine runner with double flow channels on outlet

Examples

Experimental program
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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Such as figure 1 As shown, the present invention proposes a double-channel Francis turbine runner at the outlet, which includes an upper crown 1, a lower ring 2, a plurality of blades 3 fixedly connected between the upper crown 1 and the lower ring 2, and a splitter Plate 4, the diverter plate 4 is formed by thickening a rotary surface, and its center of revolution coincides with the rotation center of the water turbine. The bottom surface of the ring 2 is flush.

[0020] In the above embodiment, the splitter plate 4 is located in the middle of the flow channel formed by every two blades 3, and divides the flow channel near the outlet between the two blades 3 into two uniform flow channels. After leaving the outlet of the blade 3, the splitter plate 4 extends along the flow line toward the inlet of the draft tube, and its lower end is flush w...

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Abstract

The invention relates to a mixed-flow water turbine runner with double flow channels on an outlet. The mixed-flow water turbine runner is characterized by comprising an upper crown, a lower ring, multiple blades fixed between the upper crown and the lower ring and a splitter plate, the splitter plate is formed by thickening a gyration surface, the gyration center of the gyration surface coincides with the rotation center of a water turbine, and the upper portion of the splitter plate intersects with the lower portions of all the blades and is connected to the lower portions of all the blades in a fastened mode. The radial flow rate on the outlet of the water turbine runner can be reduced greatly, so that it is ensured that the flow rate on the outlet of the water turbine runner is evenly distributed under the working condition of vortex strips; compared with a common runner, the flow in the rotation center of the vortex strips is increased, the pressure of the region close to an axis center region and located between outlets of the blades and an inlet of a draft tube is increased, and therefore the spiral vortex strip action of the draft tube is eliminated at the source.

Description

technical field [0001] The invention relates to a Francis water turbine runner, in particular to a Francis water turbine runner with two outlet channels used in a large hydropower station. Background technique [0002] With the continuous increase of the capacity and structural size of the hydro-generator set, the rigidity and natural frequency of the structural support of the hydro-turbine decrease while the pulsation energy of the passing water increases, so the possibility of resonance hazard increases. Therefore, for large-scale hydroelectric generating units, the problem of operational stability will be more prominent. For example, the turbine units of China's Yantan Hydropower Station and Pakistan's Tabela Hydropower Station experienced strong vibrations when they were operating in unstable areas, causing the units to fail to operate normally. And similar large-scale water turbines put into operation, such as Xiaolangdi, Dachaoshan and other hydropower stations, soon ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03B3/12
CPCY02E10/20
Inventor 高忠信朱文若陆力张飞
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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