Study On Dynamic Characteristics Of Rotor System Of Radial Flexible Mechanism Of Scroll Compressor

With the the proposed of“Double Carbon”strategic objectives,efficient and clean energy use has become an important means to promote green development.As a kind of volumetric fluid machinery with high efficiency and energy saving,scroll compressor is widely used in refrigeration,air conditioning,waste heat recovery and other fields.Due to the machining error,assembly error and liquid accumulation in the cavity,the meshing of the orbiting and static scroll wraps will deviate from the ideal standard state,resulting in tangential leakage or over-contact wear at the meshing position of the scroll wraps,which will affect the performance and operation reliability of the compressor.Radial flexibility can effectively solve this problem.As a transmission component,the rotor system of the radial flexible mechanism drives the orbiting scroll to revolve and translate.The dynamic characteristics of the rotor system of the radial flexible mechanism have a direct impact on the efficiency,vibration and wear of the compressor,and then significantly affect the performance of the whole machine.Therefore,it is of great significance to carry out the research on the dynamic characteristics of the rotor system.In this paper,the dynamic characteristics of the rotor system with eccentric slider radial compliant mechanism in scroll compressor are studied by means of theoretical analysis and numerical simulation.The motion law of the orbiting scroll in the process of avoidance and recovery and the vibration law of the rotor system are revealed.The specific work is as follows:Firstly,based on the structure and working principle of scroll compressor,the avoidance and propulsion functions of the radial compliant mechanism were analyzed from the perspective of mechanism;Through the theoretical analysis of the different limiting methods under the two anti-rotation conditions of the cross slip ring and the cylindrical pin,the limiting range of the mechanism is determined.Secondly,the dynamic characteristics of the rotor system with radial flexible mechanism are simulated and analyzed by using ADAMS software,and the motion trajectory of the mass center of the orbiting scroll is obtained,and the relationship between the mechanism limit parameters and the motion law of the mass center of the orbiting scroll is determined;Parametric optimization method is used to optimize the main bearing force by adjusting the centroid position of the eccentric slider.The results show that the orbiting scroll makes a composite motion of sliding,revolution and translation,the sliding motion has little effect on the results,and the orbiting scroll can quickly return to its original position after avoiding collision,but its existence will increase the force fluctuation of the main bearing.After parametric optimization,the maximum force on the bearing is reduced by 8.6%.The optimized radial flexible mechanism can effectively improve the vibration performance of the scroll compressor.Finally,the modal analysis and harmonic response analysis of the rotor system of the radial flexible mechanism are carried out with the help of ANSYS Workbench.The weak parts of the rotor system are determined by obtaining the natural frequencies and vibration modes of the rotor system;The Campbell diagram is used to determine the resonance probability of the rotor system within a given speed.The results show that the rotor system is stable up to the sixth order modal form,there are concentrated deformations on the surface near the auxiliary bearing end and the auxiliary bearing,and the maximum deformation of the eccentric slider is in the area near the crank pin of the main shaft;There is no critical speed point in the range of 0～6000rpm,and the resonance of the rotor system will not occur;The rotor system will produce a larger amplitude response under the higher frequency,the stress and amplitude response of the eccentric slider,that is,the crank pin of the main shaft,are larger,and the impact of the response results on the whole rotor system is within a reasonable range.The above research can provide a theoretical reference for the optimization design and performance improvement of scroll compressor with radial flexible mechanism.