Pressure reduction and vibration damping runner cone device

Abstract

The invention relates to a pressure reduction and vibration damping runner cone device which comprises a runner cone (1) connected with a runner crown (3) of a rotary wheel, wherein a ribbed plate (8) is welded to the inner side of the runner cone (1), a spiral groove (9) is formed in the outer side of the runner cone (1), a water division plate (6) is arranged on a unit, and a drainage hole (5) is formed in the unit. When a mixed flow water turbine operates, the ribbed plate on the inner side of the runner cone pressurizes water flows drained out of the drainage hole, therefore, water drainage is increased, and axial hydraulic thrust of the unit is reduced; the spiral groove in the outer side of the runner cone drives the water flows close to the runner cone to rotate to smooth the water flows and perform water jet, pressure fluctuation of a draft tube is eliminated or weakened, and problems caused by hydraulic vibration are solved.

Description

technical field [0001] The invention relates to the technical field of Francis water turbines, in particular to a pressure-reducing, shock-absorbing, and water-discharging cone device. Background technique [0002] The Francis turbine is the most widely used. This type of unit has the advantages of compact structure, reliable operation, wide water head range and high efficiency at full load. However, many power plants at home and abroad have problems of high roof pressure and hydraulic vibration to varying degrees after they are put into operation. The top cover pressure equalizing pipe is added to connect the upper cavity of the top cover with the tail water, which can play a role of pressure relief. The power station adopts methods such as avoiding the operation in the vibration area and supplementing air to solve the problem of hydraulic vibration. However, some of these methods are limited by unit layout and complex structural forms, some cause serious energy waste, an...

AI Technical Summary

Problems solved by technology

Even with this structure, many power plants at home and abroad have problems of excessive roof pressure and hydraulic vibration to varying degrees after they are put into operation

In Liujiaxia and Dachaoshan hydropower stations, the pressure in the upper chamber of the runner was too high, which resulted in the temperature of the thrust tiles being too high. The hydropower stations in Sayang, Yantan and Wuqiangxi hydropower stations vibrated significantly, and even the units were damaged.

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