涡旋压缩机动涡旋盘端面摩擦副多转速下磨损影响分析

Analysis of the Wear Effect of End-face Friction Pair on Movable Scroll Plate of Scroll Compressor under Multiple Speeds

针对涡旋压缩机工作过程中动涡旋盘端面在常见工况下因表面磨损过大导致气体泄漏问题,以某型号涡旋压缩机为研究对象,建立动涡旋盘端面摩擦副受力分析模型,分析作业过程中动涡旋盘端面受载荷变化情况;利用有限元数值模拟得到动涡旋盘在典型工况下不同转速时端面摩擦副动态接触应力变化云图,在端面磨损实验机上测得动涡旋盘常用材料QT400磨损系数,通过修正Archard磨损模型并结合有限元磨损仿真计算出在不同转速下QT400的磨损深度值,并根据材料PV值原理设计实验方案分析QT400的磨损机制。结果表明:动涡旋盘转速越快,接触应力值较大的区域磨损深度值越大:材料磨损机制主要为疲劳磨损,随着载荷增大磨损机制不断向黏着磨损转化,并伴随有少量的磨粒磨损,该研究对涡旋压缩机动涡旋盘结构改进具有一定的参考价值。

In view of the problem of gas leakage caused by excessive surface wear on the end-face of the movable scroll plate during the working process of the scroll compressor,taking a certain type of scroll compressor as the research object,the force analysis model of the end-face friction pair of the movable scroll plate was established,and the change of the load on the end-face of the movable scroll plate during the operation was analyzed.The dynamic contact stress change cloud diagram of the end-face friction pair of the movable scroll plate at different rotational speeds under typical working conditions was obtained by finite element numerical simulation.The wear coefficient of QT400,a commonly used material for the movable scroll plate,was measured on the end-face wear testing machine.The wear depth value of QT400 at different speeds was calculated by modifying the Archard wear model and combining finite element wear simulation,and an experimental plan was designed to analyze the wear mechanism of QT400 according to the material PV value principle.The results show that the faster the orbiting scroll rotates,the greater the wear depth value in the area with larger contact stress value.The wear mechanism of QT400 is mainly fatigue wear,which is continuously transformed into adhesive wear with the increase of load,accompanied by a small amount of abrasive wear.This research provides a good reference for the improvement of the scroll compressor orbiting scroll structure.