滚动转子式压缩机径向滑动轴承三维润滑数值模拟及应用研究

发布时间：2018-06-08 10:40

本文选题：滚动转子式压缩机 + 滑动轴承　；参考：《华中科技大学》2012年硕士论文

【摘要】：轴承转子系统是滚动转子式压缩机中的关键运动部件，其润滑性能的好坏将直接影响到压缩机的整机性能。因此，开展径向滑动轴承流体润滑性能分析研究，对减少轴承磨损、提高压缩机整机效率与可靠性、降低噪声与振动、延长使用寿命都具有非常重要的意义。本文以某型滚动转子式压缩机为研究对象，通过对压缩机曲轴进行动力学建模与分析，获得了压缩机主/副轴承在一个工作循环内所受载荷的变化关系。基于摩擦学基础理论，建立了压缩机径向滑动轴承流体动压润滑数值分析模型，该模型考虑了润滑表面粗糙度、润滑油粘温、粘压效应以及变密度效应等影响因素。通过计算得到整个工作循环内油膜厚度、油膜压力、轴心轨迹、摩擦功耗等润滑性能参数，并对主/副轴承流体动压润滑性能进行了分析。基于弹性力学基础理论，将流体动压润滑模型与表面法向弹性变形方程联立，建立径向滑动轴承弹流润滑数值分析模型，完成了滑动轴承弹流润滑与动压润滑性能的对比。对比分析了不同几何结构参数（轴颈半径、轴承间隙、轴承宽度）及运行参数（曲轴转速）对滑动轴承润滑性能的影响。以摩擦功耗和最小油膜厚度为评价指标，采用正交实验设计法对轴承几何结构参数进行了优化设计，提出了优化方案。研究结果表明：主轴承摩擦功耗占总摩擦功耗比重较大；增加轴承间隙、减小轴承半径和轴承宽度可以有效降低主轴承摩擦功耗；增加轴承宽度、轴承半径可以增加轴承润滑表面接触面积，降低油膜压力，增加最小油膜厚度。在设计轴承参数时，要对最小油膜厚度和轴承摩擦功耗两个评价指标综合考虑。在保证最小油膜厚度使润滑处于流体润滑的前提下，，选取摩擦功耗尽可能低的方案。
[Abstract]:The bearing rotor system is the key moving part in the rolling rotor compressor. Its lubrication performance will directly affect the whole performance of the compressor. Therefore, the analysis and study of the lubrication performance of the radial journal bearing can reduce the wear of the bearing, improve the efficiency and reliability of the compressor, reduce the noise and vibration, and prolong the service life. Life is of great significance.
In this paper, the dynamic modeling and analysis of a compressor crankshaft is taken as the research object. The change relation of the load of the compressor main / auxiliary bearing in a working cycle is obtained. Based on the basic theory of tribology, a numerical model for hydrodynamic lubrication of the compressor radial sliding bearing is established. The model considers the influence factors such as the roughness of the lubricating surface, the viscosity temperature of the lubricating oil, the viscosity pressure effect and the variable density effect. The lubrication performance parameters such as the oil film thickness, the oil film pressure, the axis trajectory, the friction power and so on are calculated, and the hydrodynamic lubrication performance of the main / auxiliary shaft bearing fluid is analyzed. Based on the elastic mechanics basis, the model is calculated. In theory, the hydrodynamic lubrication model and the surface method are combined to the elastic deformation equation, the elastohydrodynamic lubrication numerical model of the radial sliding bearing is established, and the comparison between the elastohydrodynamic lubrication and the dynamic lubrication performance of the sliding bearing is completed. The different geometric structure parameters (axial neck radius, bearing clearance, bearing width) and operating parameters (Qu Zhouzhuan) are compared and analyzed. The effect of speed) on the lubrication performance of the sliding bearing. With the friction power and the minimum oil film thickness as the evaluation index, the orthogonal experimental design method is used to optimize the geometric structure parameters of the bearing, and the optimization scheme is put forward.
The results show that the friction power of the main bearing occupies a large proportion of the total friction power; increasing the bearing clearance, reducing the bearing radius and bearing width can effectively reduce the friction power of the main bearing; increase the bearing width, the bearing radius can increase the contact area of the bearing lubrication surface, reduce the oil film pressure, and increase the minimum oil film thickness. In the design axis, the bearing radius can be increased. When the parameters are supported, the minimum oil film thickness and the friction power consumption of the bearing should be considered synthetically. Under the premise of ensuring the minimum oil film thickness to make the lubrication in the fluid lubrication, the minimum friction power consumption is selected as the lowest possible scheme.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH133.31;TH117.2

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