振动与冲击对机械密封瞬态性能的影响  

Effects of Vibration and Shock on the Transient Performance of the Mechanical Seal

作　　者：王青阳 王增丽[2] 吴伟烽[1] 于博 张平 WANG Qingyang;WANG Zengli;WU Weifeng;YU Bo;ZHANG Ping(School of Energy and Power Engineering,Xi'an Jiaotong University,Shaanxi Xi'an 710049,China;College of New Energy,China University of Petroleum,Shandong Qingdao 266580,China;Xi'an Aerospace Propulsion Institute,China Aerospace Science and Technology Corporation,Shaanxi Xi'an 710100,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]中国石油大学(华东)新能源学院,山东青岛266580 [3]中国航天科技集团有限公司西安航天动力研究所,陕西西安710100

出　　处：《摩擦学学报(中英文)》2024年第12期1694-1706,共13页Tribology

基　　金：国家重点研发计划项目(2020YFB2010000);国家自然科学基金项目(51706247);陕西高校青年创新团队资助。

摘　　要：在多相泵输送油气混相介质过程中,原油中甲烷的溶解析出和断塞流的冲击会引起轴系振动和工况波动冲击,从而影响机械密封的瞬态性能.为了探究振动和冲击对瞬态密封性能的影响,建立了考虑甲烷溶解的机械密封瞬态动力学模型.给出了不同位移扰动、动力学参数以及工况波动冲击下的液膜流场演变特性和瞬态密封性能.结果表明:振动会导致液膜动压和空化区波动,波动范围在67.2%~172%之间.密封性能的波动幅度和频率随着位移扰动的增大而增大.当O型圈阻尼为1.2 kN·s/m,浮环质量为0.5 kg时,密封性能的波动幅度和频率最小.机械密封的冲击响应和冲击频率的变化随着转速、含气率和压力冲击的升高而更为剧烈.多相泵的机械密封应采用阻尼大的O型圈和质量小的浮环,并可通过增加补偿机构来提高密封系统的抗干扰能力.With the increasing demand for energy and the decreasing availability of onshore oil and gas resources,offshore oil fields,desert oil fields,and marginal oil fields are being vigorously developed.In the process of oil and gas resource exploitation,oil and gas transportation technology is the key to cost savings,energy consumption reduction,and profit increase.Multiphase mixed transportation technology is widely applied due to its low investment cost,longdistance transportation,and high oil well production efficiency.As one of the core equipments in multiphase mixed transport,a multiphase pump possesses the advantages of low cost,high efficiency,lightweight,and small volume.Therefore,the performance of a multiphase pump directly determines the extraction efficiency of oil and gas resources.For multiphase pumps,the leakage is one of the key performance indicators,and the magnitude of the leakage directly determines the operational efficiency of the multiphase pump.Mechanical seals are widely used in multiphase pumps due to their excellent sealing performance,long operating cycles,and wear resistance.However,in the context of oil and gas media transportation,it is observed that both the oil and gas phases enter the sealed end face concurrently,resulting in the formation of an oil and gas mixed film.Moreover,methane present in natural gas is susceptible to dissolving or precipitating in the oil phase due to variations in film pressure,thereby influencing the sealing performance.Additionally,fluctuations in gas content can induce shaft vibration and impact operational conditions(such as speed,pressure,and gas content),causing transient alterations in the sealing ring,disturbances in film thickness,increased wear of the seal ring,and heightened leakage.In this paper,a transient dynamic model of the mechanical seal considering methane dissolution was established to investigate the effects of vibration and impact on the transient sealing performance.The evolution characteristics of the liquid film flow field and transien

关 键 词：多相泵 机械密封 振动 冲击 瞬态性能 

分 类 号：TH117.2[机械工程—机械设计及理论]