The Method of Avoiding Cracks in the Runner Blades of Francis Turbine
A technology for runner blades and water turbines, which is applied to the use of sound waves/ultrasonic waves/infrasonic waves to analyze solids, test metals, and material inspection products. It can solve problems such as blade cracks, runner blade inspection requirements that are too loose, and blade quality requirements that cannot be guaranteed. , to achieve the effect of reasonable size and reliable operation
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[0018] The runner blades of the Francis turbine are assembled between the upper crown and the lower ring of the runner. The shape of the runner blades is as follows: figure 1 As shown, it is surrounded by four curved sides, which are the water outlet side 1, the upper crown connection side 2, the water inlet side 3 and the lower ring connection side 4, and the runner blade will be connected to the upper crown through the upper crown connection side 2 , connect edge 4 to the lower ring via the lower ring.
[0019] Practice has proved that cracks are most likely to occur near the water outlet during the operation of the runner blades. Therefore, the water edge of the runner blade needs to be used as a key area for quality assurance. According to different stress levels, the present invention further divides the water outlet edge of the runner blade into several different areas, and performs quality control according to different standards.
[0020] Therefore, the first problem...
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