Study On Friction And Wear Characteristics Of Thrust Bearing In Rotary Compressor

The thrust bearing in rotary compressor is always working in the poor state of heavy load,high speed and high temperature .Its lubrication status,friction and wear characteristics play an very important part in the normal operating state of compressor .With considering the wear resistance of the thrust bearing , various main factors influencing wear volume have been analyzed .On the basis of the classical adhesive wear equation, fractional film defect computing has been considered to built a mathematical model for numerical simulation of wear and frictional losses under boundary lubrication condition. A friction and wear characteristics analysis software has been written on the basis of the above work. The software has friendly and convenient user interface.Through the orthogonal experiment,settle load and variable speed experiment, settle speed and variable load experiment in the friction and wear experiment , the influence of load, sliding speed and other external friction conditions on wear volume and friction coefficient was considered . It also corrects some of the parameters in the mathematical model and improves the accuracy of the model.The analysis of experimental results show that the theory value is consistent with the experimental value. Through the orthogonal experiment,it is found that load is the most important factor effecting wear loss and lubricant species is the most important factor effecting friction coefficient. It is found that wear loss increases as load increases and sharply increase when load reaches certain value. Wear loss decrease as speed increases and reach a plateau when speed reaches certain value. Load and speed both have a power function relation with wear loss. Through the simulation experiment of real thrust bearing, frictional power loss first increases and then decreased when the radius of the thrust bearing increases, and it increases when load or speed increases, and it is proportional to both of them. Based on the microscopy of experimental samples, the main wear mechanism of thrust bearing in rotary compressor is adhesive wear.