滚动转子式压缩机止推轴承摩擦磨损性能分析与实验研究

发布时间：2018-04-09 06:23

本文选题：滑动摩擦　切入点：粘着磨损　出处：《华中科技大学》2011年硕士论文

【摘要】：滚动转子式压缩机止推轴承长期处于重载、高速、高温等恶劣工作环境中,其润滑状况及摩擦磨损特性将直接影响到压缩机的运行性能与使用寿命。因此,研究其摩擦磨损特性对保障压缩机的正常运转具有非常重要的意义。本文以提高滚动转子式压缩机止推轴承耐磨性、降低摩擦功耗为研究目标。首先,从理论上分析了影响摩擦副磨损量和摩擦功耗的各主要因素。基于经典的粘着磨损模型,建立了边界润滑状态下滚动转子式压缩机止推轴承磨损量和摩擦功耗数值分析模型。模型中考虑了载荷、转速、止推面半径等影响因素。通过数值模拟计算,对比分析了这些因素对滚动转子式压缩机止推轴承磨损量和摩擦功耗的影响。在此基础上,采用Visual C++编制了滚动转子式压缩机止推轴承摩擦磨损性能分析软件。软件具有友好的操作界面,可以方便用户使用。在完成理论建模与分析的基础上,开展了滚动转子式压缩机止推轴承摩擦磨损性能的实验研究。通过正交实验、定载变速与定速变载实验测取了不同工况下试件的磨损量和摩擦功耗等实验数据。对比分析了载荷、转速、止推面半径等外摩擦条件对试件磨损量和摩擦系数的影响,并根据实验测试结果修正了理论模型中的参数值,提高了模型的准确性。通过对止推轴承摩擦磨损理论分析与实验测试结果的对比分析表明,理论模型计算值与实验值比较吻合,验证了理论模型的正确性与准确性。通过正交实验研究表明,载荷是影响磨损量的最重要外摩擦因素;润滑油种类是影响摩擦系数的最重要因素。通过实验数据的分析表明,在相同条件下磨损量随着载荷的增加而增大,当载荷到达一定值时,磨损量急剧增加。在一定转速范围内,磨损量随着转速的增加而减小,减小到一定值后趋于平稳。对模拟真机实验结果的分析表明,摩擦功耗随止推面半径的增大先增大后减少;随着载荷和转速的增大而增大并都成正比关系。通过对对磨试样摩擦表面的显微观察,进一步验证压缩机止推轴承磨损机理主要是粘着磨损。
[Abstract]:The rolling rotor type compressor thrust bearing is in the heavy load, high speed and high temperature working environment for a long time, its lubrication condition and friction and wear characteristic will directly affect the compressor's running performance and service life.Therefore, it is very important to study its friction and wear characteristics to ensure the normal operation of compressor.The purpose of this paper is to improve the wear resistance and reduce the friction power of thrust bearing of rolling rotor compressor.Firstly, the main factors affecting the wear and friction power consumption of friction pairs are analyzed theoretically.Based on the classical adhesive wear model, a numerical analysis model of wear and friction power consumption of thrust bearing of rolling rotor compressor under boundary lubrication is established.Factors such as load, speed and thrust radius are considered in the model.The effects of these factors on wear and friction power consumption of thrust bearing of rolling rotor compressor are compared and analyzed by numerical simulation.On this basis, the friction and wear performance analysis software of thrust bearing of rolling rotor compressor is programmed by Visual C.The software has a friendly operating interface and can be easily used by users.On the basis of theoretical modeling and analysis, the friction and wear performance of thrust bearing of rolling rotor compressor is studied experimentally.The experimental data of wear and friction power consumption of specimens under different working conditions were measured by orthogonal experiment, constant load change experiment and constant speed variable load experiment.The effects of external friction conditions such as load, rotation speed and thrust surface radius on the wear and friction coefficient of the specimen are compared and analyzed. The parameters in the theoretical model are corrected according to the experimental results, and the accuracy of the model is improved.The comparison between the theoretical analysis and the experimental results of friction and wear of thrust bearing shows that the calculated value of the theoretical model is in good agreement with the experimental value, which verifies the correctness and accuracy of the theoretical model.The orthogonal experiment shows that the load is the most important external friction factor affecting the wear rate and the type of lubricating oil is the most important factor affecting the friction coefficient.The analysis of experimental data shows that the wear amount increases with the increase of load under the same condition, and increases sharply when the load reaches a certain value.In a certain range of rotational speed, the wear amount decreases with the increase of rotational speed, and tends to be stable after decreasing to a certain value.The analysis of the experimental results shows that the friction power consumption increases firstly and then decreases with the increase of the thrust radius, and increases with the increase of load and speed.The wear mechanism of compressor thrust bearing is mainly adhesive wear through microscopic observation of friction surface of grinding sample.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TH45

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