抽水蓄能机组顶盖漏水原因分析

发布时间：2018-05-16 07:36

本文选题：顶盖螺栓 + 漏水　；参考：《人民长江》2017年23期

【摘要】：针对某抽水蓄能机组顶盖出现的漏水现象,对其在各个运行工况下的顶盖螺栓总载荷及残余预紧力进行了计算。由计算结果可以发现,由于在个别工况下残余预紧力小于0,导致了顶盖漏水,通过调整螺栓的伸长量,使得残余预紧力大于0,漏水现象得到了改善,但是预紧安全系数仍无法满足相关标准的要求。为此,进行了认真分析和复核。结果发现:在现有螺栓数量的基础上,通过增加预紧力虽然可以提高预紧的安全系数,但同时也得螺栓的总载荷增加,降低材料的安全系数,增加了螺栓断裂的可能性。针对新问题制定了相应的措施,即将螺栓小径由36 mm增加至52 mm后,通过增加预紧力提高预紧安全系数,保证螺栓连接的紧密性,村料的安全系数也得到了保证。改进后的螺栓在机组运行过程中服役安全。
[Abstract]:The total load and residual preload of cap bolts in a pumped-storage unit are calculated according to the leakage phenomenon in the roof cover of a pumped-storage unit. From the calculation results, it can be found that the residual pretightening force is less than 0 under individual working conditions, which leads to the leakage of the top cover. By adjusting the elongation of the bolt, the residual pretension force is greater than 0, and the leakage phenomenon is improved. However, the pre-tightening safety factor still can not meet the requirements of relevant standards. To this end, carried out serious analysis and review. The results show that on the basis of the number of existing bolts, the safety factor of the bolt can be increased by increasing the pretightening force, but at the same time, the total load of the bolt is increased, the safety factor of the material is reduced, and the possibility of bolt fracture is increased. The corresponding measures are made to solve the new problem, that is, after the bolt diameter is increased from 36 mm to 52 mm, the safety factor of the bolt is improved by increasing the pretension force to ensure the tightness of the bolt connection, and the safety factor of the village material is also guaranteed. The improved bolt is safe in service during the operation of the unit.
【作者单位】：国网新源控股有限公司技术中心;国网新源控股有限公司回龙分公司;
【分类号】：TV738;TV743

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