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一、简介国内很多大型水电站均装有蝴蝶阀,在事故时应能截断水流,以保证水电站的安全,在蝶阀活门接近全关位值时,两侧水压差常超过水轮机正常水头值。国内作过蝶阀试验的单位不多,且多为中低水头机组。试验中,钢管最大振动值及蝶阀支墩位移值常达数毫米,而且噪音大。试验时如阀前、后钢管破裂,轻则中断送电,重则水淹厂房。蝶阀使用水头越高,阀后单机出力越大,则钢管的振动值及噪音值越大。很多单位不敢作此试验,不敢将蝶阀作后备保护使用。故亟待查清振动与噪音的来源,采取相应的安全对策并通过试验以验证其安全性。
I. INTRODUCTION Many domestic large-scale hydropower stations are equipped with butterfly valves. In case of accidents, they should be able to cut off the water flow so as to ensure the safety of hydropower stations. When the valve flaps are close to the full valve position, the water pressure on both sides often exceeds the normal head of the turbine. Butterfly valve test made in China is not many units, and mostly low-head unit. In the test, the maximum vibration value of steel pipe and butterfly valve pier often up to several millimeters displacement, but noisy. Tests such as the valve before and after the steel tube rupture, ranging from interrupt transmission, heavy water flooded plant. The higher the head of the butterfly valve, the greater the output of the valve after the single machine, the greater the value of vibration and noise of the steel pipe. Many units did not dare to make this test, not to use the butterfly valve for backup protection. It is urgent to find out the source of vibration and noise, take appropriate safety measures and test to verify its safety.