Research On Multi-body Dynamics Characteristics Of Scroll Compressor Rotor System

With its unique advantages,scroll compressors have been widely used in many fields such as air conditioning and refrigeration,medical and health,and new energy.With the development of new industries,the development of scroll machinery will become more and more popular.The rotor system is the core part of the scroll compressor.It is very important for the scroll compressor to maintain good dynamic characteristics under various complicated w orking conditions.This paper takes the rotor system of the scroll compressor as the research focus,uses the dynamic simulation software ADAMS and the finite element analysis software ANSYS to establish a rotor system model that includes the clearance of the moving pair and the flexibility of the crankshaft member,and considers the overturning force of the movable scroll and different motions.The secondary clearance affects the rotor system,and the components are analyzed and compared according to the corresponding simulation results.At the same time,the force analysis and speed response analysis of the anti-autotransmission mechanism are carried out to provide analysis on the design of the scroll compressor and the dynamic characteristics of the rotor system.Methodological and theoretical guidance.This paper firstly analyzes the force and motion form of th e scroll compressor small crank by combining dynamics and kinematics,and obtains the change law of the force and moment received by the small cran k in a cycle through MATLAB calculation,and analyzes the movement of the small crank The theory is verified by motion simulation,and the stress and strain distribution law of the small crank is calculated by using ANSYS software according to the differen t loads of the small crank and its reliability is checked.Secondly,with the rotating hinge contact model as the support,the dynamic model of the scroll compressor rotor system with the moving pair clearance is established in ADAMS.Considering the simul ation analysis under different moving pair clearances and gas force conditions,the movement laws of differen t components of the rotor system at a constant speed are obtained.The results show that the inclination angle of the movable scroll increases with the increase of the clearance;the change of the moving pair clearance has almost no effect on the displacem ent of the eccentric end of the small crank and the drive bearing,and has little effect on the speed of the drive bearing;the acceleration of the drive bearing And the contact collision force between the hinges of the crank pin is greatly affected by the change of the gap;the larger the gap,the greater the deviation of the bearing’s center of mass motion trajectory,and the more serious the wear.At the same time,based on the rigid-flexible coupling theory,a rigid-flexible coupling model with the cran kshaft as a flexible body member is established,and the simulation analysis of the rigid-flexible coupling model is completed and the comparison w ith the rigid body model shows that the clearance of the moving pair is certain,and the flexibility of the c rankshaft will cause the movable scroll The inclination angle of the bearing increases accordingly;the displacement and speed of the bearing are l ess affected by the flexibility of the crankshaft;the acceleration of the bearing and the contact collision force at the hinge of the crank pin are greatly affected by the flexibility of the crankshaft;the bearing centroid displacement trajectory of the rigid-flexible coupling model The deviation range is greater.Finally,from the theoretical analysis of the r easons for the non-synchronization of the speed response between the small crank and the main shaft,considering the gas force and the uniform acceleration of the main shaft,the simulation results show: the size of the moving pair gap and the difference i n contact damping respond to the speed of the small crank It has a greater impact,and the existence of the movement pair clearance will cause the failure of the small crank structure.The larger the movement pair clearance,the lower the failure speed of the crank.