唇形密封圈润滑性能及对转子动力学性能影响研究

发布时间：2018-01-08 12:34

本文关键词：唇形密封圈润滑性能及对转子动力学性能影响研究　出处：《华东理工大学》2013年博士论文　论文类型：学位论文

【摘要】：唇形密封圈是机械设备中的重要元件,其密封性能的好坏直接影响到机械设备的使用效果和使用寿命。在正常工作时,唇形密封圈的密封唇和轴之间通常会形成一层很薄的流体动压油膜。以往关于唇形密封圈流体动压润滑的研究中,很少有考虑两接触表面的微观随机形貌,在分析流体动压时没有考虑橡胶密封唇口表面微凸体的初始弹性变形以及转动过程的形貌随机变化,在数值计算研究中没有考虑过盈量对密封圈润滑和泄漏性能的影响。此外,也未见有人研究唇形密封圈对转子系统振动性能的影响。针对这些问题,本文以唇形密封圈为研究对象展开研究,采用数值模拟和试验研究相结合的方法,深入研究了唇形密封圈的润滑性能和密封性能,研究了唇形密封圈对转子动力学性能的影响。本文的主要研究内容和取得的成果包括：采用基于AR模型的二维数字滤波技术和基于随机过程和时间序列模型的粗糙表面计算机模拟方法,构造了粗糙表面的指数自相关函数,模拟出密封唇和轴表面的三维随机粗糙表面；建立了密封圈和轴过盈接触的有限元模型,计算出密封唇的径向变形系数矩阵和切向变形矩阵；提出并构建了一种能够同时考虑密封唇和轴表面微观形貌、密封唇过盈量、密封唇的弹性变形等因素的流体动压润滑性能的数值模拟计算方法。对唇形密封圈进行了数值模拟研究,计算并分析了不同初始过盈量下流体润滑性能的变化规律；建立了一种能够同时考虑唇口过盈量、密封压力以及密封区域宽度方向各截面润滑油流量波动等因素的唇形密封圈泄漏率的数值模拟计算方法；建立了能够对轴的安装偏心量和密封圈初装间隙对密封圈性能影响进行计算的方法,分析了不同过盈量、密封压力和安装偏心量下唇形密封圈的润滑、密封性能；在考虑密封圈和轴的表面形貌变化、安装过盈量、密封圈和轴接触位置、接触角度、接触宽度变化、以及温度对润滑油粘度影响的前提下,应用Reynolds方程和“全局热平衡法”,构建了唇形密封圈热流体动力润滑数值模拟计算方法,计算研究了不同转速和不同初始过盈量下唇形密封圈油膜厚度、油膜压力、摩擦力、发热量、温度、泄漏率等一系列参数的变化规律；采用传递矩阵法构建了“轴承-转子-密封”系统的动力学模型,计算了“轴承-转子-密封”系统弯曲振动的固有频率、阻尼衰减因子和模态振型,并分析了叶轮和带轮的偏心不平衡量对系统不平衡响应振幅的影响。通过对“轴承-转子-密封”系统和“轴承-转子”系统的振动性能的比较,分析了唇形密封圈对转子动力学性能的影响；试验研究了不同过盈量对密封系统的温升、密封圈与轴接触面间摩擦力等性能参数的影响规律,并将试验所测得的数据与理论计算结果进行比较,在一定程度上证明了本文数值模拟研究成果的可靠性。本文的研究内容和取得的成果将可以为唇形密封圈性能的进一步研究以及在工业中的实际应用提供重要的理论支撑。
[Abstract]:Lip seal is an important component of the mechanical equipment, the sealing performance will directly affect the mechanical equipment use effect and service life. In normal operation, usually between the lip and shaft seal will form a very thin layer of fluid dynamic pressure oil film lip seal. The previous research on lip seal fluid dynamic pressure lubrication, seldom consider the micro morphology of two random contact surface morphology, random changes in the initial elastic analysis of hydrodynamic pressure without considering the rubber seal lip surface asperity deformation and rotation process, the numerical calculation research did not consider in the influence of the amount of interference of sealing ring lubrication and leakage performance. In addition, there is also no influence on the vibration performance of rotor system of lip seal. Aiming at these problems, based on the lip seal for research object, numerical simulation and experiment research In this method, the lubrication and sealing properties of the lip seal are studied, and the influence of the lip seal ring on the dynamic performance of the rotor is studied.
The main research contents and achievements include: using two-dimensional digital filter technology of AR model and rough surface computer random process and time series model based on simulation method based on the structure of rough surface with exponential autocorrelation function, simulate the lip seal and the shaft surface three dimensional random rough surface; a finite element sealing ring and the axial interference contact model, calculate the radial lip seal deformation coefficient matrix and tangential deformation matrix; puts forward a can also consider the sealing lip and shaft surface morphology, sealing lip interference, fluid lip deformation factors such as dynamic pressure lubrication properties of the numerical simulation method the sealing ring on the lip. Through numerical simulation, analysis of the variation between the interference under fluid lubrication performance and calculation; to establish a new test at the same time Considering the lip interference, method of numerical computation and factors of sealing pressure sealing area width direction of each section of oil flow fluctuation lip seal leakage rate; establish a method that can calculate the effect on the seal performance of the shaft installed eccentricity and seal installation clearance, analyzes the different interference the amount of lubrication, sealing, pressure and volume under the installation eccentric lip seal sealing performance; considering the surface morphology of the sealing ring and the shaft changes, installation amount of interference, the sealing ring and the shaft contact location, contact angle, contact width change, the premise and the influence of temperature on viscosity of lubricating oil under the application of Reynolds equation and "the global heat balance method, constructed the lip seal ring thermal hydrodynamic lubrication numerical simulation calculation method, calculation of different speed and different initial interference under the lip seal oil film thickness, oil film pressure, The friction, heat, temperature variation, leakage rate and a series of parameters; using the transfer matrix method to build a dynamic model of rotor bearing seal system, calculate the rotor bearing seal system of bending vibration frequency, damping factor and modal analysis, and the impeller and the pulley eccentric unbalance unbalance response of the system is studied. By comparing the amplitude of vibration performance of rotor bearing seal system and rotor bearing system, analyzes the lip seal on the performance of the rotor dynamics influence; experimental research on different amount of interference of the sealing system of temperature L, influence of contact surface between the friction ring and the shaft sealing performance parameters, and comparing the measured data and the calculated results of the test, to a certain extent, proved that the numerical simulation results can By sex.
The research contents and achievements of this paper will provide important theoretical support for further research on the performance of lip seal and practical application in industry.

【学位授予单位】：华东理工大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TH136

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