单级离心泵机械密封维修周期及可靠性研究  

Maintenance cycle and reliability for mechanical seal in single-stage centrifugal pump

作　　者：郑庆元 路笃辉 刘勇明[1] ZHENG Qing-yuan;LU Du-hui;LIU Yong-ming(Procurement Center,Zhejiang Institute of Mechanical&Electrical Engineering,Hangzhou 310053,China;China Special Equipment Inspection&Research Institute,Beijing 100029,China)

机构地区：[1]浙江机电职业技术学院采购中心,浙江杭州310053 [2]中国特种设备检测研究院,北京100029

出　　处：《机电工程》2023年第6期960-966,共7页Journal of Mechanical & Electrical Engineering

基　　金：国家重点研发计划项目(2018YFC0808601)。

摘　　要：为了研究影响单级离心泵机械密封维修周期及运行可靠性的关键因素,根据对离心泵机械密封失效数据的统计,利用威布尔分布函数分析了数据服从的分布类型及参数值,研究了单级离心泵机械密封的可靠性规律及维修周期。首先,对国内某炼化企业单级离心泵的失效部件及失效模式进行了概率统计,得出了单级离心泵失效概率最高的部件为机械密封的结论,其失效率最高的失效模式为外部泄漏(工艺);然后,采集了常减压装置单级离心泵机械密封的无故障运行时间数据,确定了其所服从的分布类型,进而确定了机械密封在一定可靠度下的维修周期及可靠性规律;最后,对机械密封常见的失效机理进行了分析,并给出了各失效机理的失效概率数据。研究结果表明:该组单级离心泵机械密封的无故障运行时间服从三参数威布尔分布,且拟合效果优于指数分布、正态分布;该机组机械密封的平均无故障时间(MTBF)、平均维修时间和可用度分别为:12745 h,55 h和99.6%。In order to study the key factors affecting the maintenance cycle and operation reliability of mechanical seals of single-stage centrifugal pumps,according to the statistics of failure data,the distribution type and parameters were analyzed using Weibull distribution function,and the reliability law and maintenance cycle of mechanical seals were studied.Firstly,through the probability statistics of the failure components and failure modes of single-stage centrifugal pumps in a domestic refining and chemical enterprise,it was concluded that the component with the highest failure probability of single-stage centrifugal pump was the mechanical seal,and the failure mode with the highest failure efficiency was external leakage(process).Then,the data of the trouble-free operation time of the mechanical seal of single-stage centrifugal pump in the atmospheric and vacuum distillation unit were collected to determine its distribution type,and then the maintenance cycle and reliability rule of the mechanical seal under a certain reliability were determined.Finally,the common failure mechanisms of mechanical seals were analyzed,and the failure probability data of each failure mechanism were given.The research results show that the fault free operation time of the mechanical seal of the single-stage centrifugal pump obeys the three parameter Weibull distribution,and the fitting effect is better than exponential distribution and normal distribution.The mean time between failures(MTBF),mean maintenance time,and the availability of mechanical seals of the unit are respectively 12745 h,55 h and 99.6%.

关 键 词：单级离心泵 平均无故障时间 平均维修时间 威布尔分布函数 失效模式影响及危害性分析 失效机理 失效概率 

分 类 号：TH311[机械工程—机械制造及自动化] TH17