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渔子溪一级水电站水轮机转轮上冠与顶盖之间采用的是梳齿止漏装置。为测量两梳齿之间的间隙布置有测孔。该孔因受汽蚀与泥沙磨损的破损,曾造成穿孔,穿孔后其漏水射流射进水轮机导轴承油盆内,引起烧瓦事故。测孔位置示意见图1。顶盖为20SiMn钢,厚40mm,ZGOCr_(13)Ni_6Mo不锈钢止漏环厚35mm,总孔深75mm。该孔原设计采用G3/4″螺钉封堵,螺纹长15mm。在运行中由于受高速微小沙粒在孔中冲撞磨蚀,并不断向纵深扩展,在一个大修周期,测孔即被磨穿产生
Yuzizi Hydropower Station Turbine runner between the crown and the top is comb teeth to stop leakage device. To measure the gap between the two comb teeth measuring holes arranged. The hole due to cavitation and sediment wear and tear damage, has caused perforation, perforated water leakage jet shot into the turbine bearing oil bearing pot, causing the tile accident. Figure 1 shows the hole location. Top cover 20SiMn steel, thickness 40mm, ZGOCr_ (13) Ni_6Mo stainless steel stop leak ring thickness 35mm, total hole depth 75mm. The original hole design G3 / 4 "screw closure, thread length 15mm. In operation due to high-speed tiny sand collision in the hole erosion, and continue to expand to the depth, in a major repair cycle, the hole is worn wear out