柔性间隙影响下涡旋压缩机主轴系统动力学特性研究

考虑到涡旋压缩机主轴系统的高速回转特性，将自由运动和接触变形两状态非连续接触模型应用于间隙运动副动力学建模。以某卧式涡旋压缩机为依据，在不同运动副间隙下构建基于ADAMS/View的主轴系统刚柔耦合模型。通过柔性接触条件下的动力学仿真计算，深入分析了主轴系统核心部件(如动涡盘、曲轴、十字滑环及轴承)的运行状态及承载情况。结果显示：在理想间隙(间隙为0)下，柔性曲轴质心轨迹为一带有波动的非标准圆，而在非理想状态下，曲柄销与滚针轴承存在多处接触碰撞；当轴承内部存在间隙时，Z方向上的支反力更为连续和集中，且其波动幅度随着间隙增大而减小；间隙为0.01 mm时对于动涡盘加速度影响较大，不利于容积腔形成和气体压缩，而选择0.03 mm或0.05 mm间隙值时，可避免轴承系统发生应力集中和疲劳破坏，同时有助于轴承系统维护和十字滑环防自转。

Study on Dynamic Characteristics of Scroll Compressor Spindle System with Flexible Joint Clearance

In view of the high-speed working characteristics for scroll compressor spindle system,the discontinuous contact model with two-state was applied to dynamic modeling of joint clearance.On the basis of a horizontal scroll compressor,rigid flexible coupling model of the spindle system under different joint clearance was constructed by ADAMS/View.The running status and loading condition of some core components (such as orbiting scroll,crankshaft,cross slip ring and bearing) were deeply analyzed,which through dynamic simulation and calculation under the condition of flexible contact.The results show that the centroid trajectory of flexible crankshaft with ideal clearance(no clearance) is a nonstandard circle with fluctuations,while under a non-ideal state,there are multiple contact collision between the crank pin and needle bearing.When there is clearance in the bearing,the support reaction force in the Z direction is more continuous and concentrated,and its fluctuation amplitude will decrease with the increase of the joint clearance.When the clearance is 0.01 mm,it has an obvious influence on the acceleration of the orbiting scroll,which is not conducive to the formation of the volume cavity and gas compression.When the clearance is 0.03 mm or 0.05 mm,stress concentration and fatigue damage of the bearing system can be avoided,and it is also helpful to the maintenance of the bearing system and the prevention of the cross slip ring from rotating.