摘要
机械密封动环和静环之间形成的润滑膜厚度是其稳定运行的一个重要评价指标,为实现润滑膜厚度的非接触检测,根据机械密封润滑膜的特点,构建了接触式机械密封润滑膜的超声检测模型,并推导了润滑膜厚度的计算公式。指出机械密封在运行过程中会产生两相流,准确测量机械密封润滑膜的厚度,必须考虑密封介质的两相问题。引入中间变量混合因子,通过试验获得混合因子和密封润滑介质密度的变化关系,进行气液两相润滑下的机械密封润滑介质密度的表征。对两相润滑下的机械密封润滑膜厚度进行超声测试,对考虑两相和不考虑两相的润滑膜厚度计算值进行对比分析。研究结果表明:在汽化程度不高时,考虑两相的润滑膜厚度计算值与真实值更接近;随着汽化程度的增加,超声检测的精度在降低,需从升速和声阻抗等参数的变化方面综合考虑。
The thickness of the lubricating film formed between the moving ring and the static ring of the mechanical seal is an important evaluation index for its stable operation.In order to realize the non-contact detection of the lubricating film thickness,according to the characteristics of the mechanical seal lubricating film,an ultrasonic testing model of the contact mechanical seal lubricating film was constructed,and the calculation formula of the lubricating film thickness was deduced.It is pointed out that the mechanical seal of the turbo pump will produce two-phase flow during the operation,and the two-phase problem of the sealing medium must be considered in order to accurately measure the thickness of the lubricating film.A mixed factor of intermediate variables was introduced,and the relationship between mixed factor and the density of the sealing lubrication medium was obtained through experiments,and the mechanical seal lubrication medium density under gas-liquid two-phase lubrication was characterized.The thickness of lubrication film of mechanical seal under two-phase lubrication was measured by ultrasonic method,the calculated values of lubricant film thickness with and without two phases were compared and analyzed.The results show that when the degree of gasification is not high,the calculated value of lubricant film thickness with two phases is closer to the real value,and with the increase of the degree of gasification,the accuracy of ultrasonic detection is reduced.It is necessary to consider comprehensively the change of the parameters such as the acceleration and the acoustic impedance.
作者
刘朝丰
贾谦
郑钰波
董心怡
王建磊
LIU Chaofeng;JIA Qian;ZHENG Yubo;DONG Xinyi;WANG Janlei(Shaanxi Province Aerospace and Astronautics Propulsion Research Institute Co.,Ltd.,Xi'an Shaanxi 710003,China;Department of Mechanical Engineering,Xi'an Jiaotong University City College,Xi'an Shaanxi 710018,China;Mechanical System Control and Robot Application Institute,Xi'an Jiaotong University City College,Xi'an Shaanxi 710018,China;School of Mechanical and Precision Instrument Engineering,Xi'an University of Technology,Xi'an Shaanxi 710048,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第2期57-61,共5页
Lubrication Engineering
基金
西安交通大学城市学院校级项目(2020Y12)。
关键词
机械密封
两相润滑
超声波
润滑膜
mechanical seal
two phase lubrication
ultrasonic
lubricating film
