The single-stage water-ring vacuum pump was damaged by cavitation accumulation after years of operation and seriously affected the security of the operation of the unit.In order to solve it,the pump has been replaced by the anti-cavitation two-stage cone-type vacuum pump which can lessen and even avoid cavitation,enhance the secu-rity of the operation of the unit and reduce the operating cost.%因多年运行的汽蚀累积作用而损坏的单极真空泵无法正常运行，严重影响了机组运行的安全性。针对这一问题，将其更换为抗汽蚀性较好的双击锥体真空泵，减弱甚至避免了汽蚀现象的产生，不但提高了机组运行的安全性，还降低了运行成本。
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