考虑运动副间隙的动涡旋盘运动学特征及磨损研究

Study on Kinematic Characteristics and Wear of the Orbiting Scroll Considering Motion Pair Clearance

动涡旋盘与十字滑环组成的运动副间隙易造成涡旋压缩机产生振动与冲击。通过在低转速条件下对动涡旋盘、十字滑环等关键运动部件进行运动学仿真,揭示十字滑环与动涡旋盘产生冲击的原因。运动副之间的磨损增大十字滑环与动涡旋盘之间的冲击,通过试验研究涡旋压缩机工作过程中十字滑环与动涡旋盘配副的磨损特征,预测涡旋盘的工作寿命。研究发现:十字滑环凸键对机架键槽的冲击比对动涡旋盘键槽的冲击更大,而它与动涡旋盘键槽组成的运动副间隙与动涡旋盘自转现象具有显著的正相关性,动涡旋盘自转过大易造成涡旋齿干涉撞齿;当十字滑环凸键与动涡旋盘键槽接触角磨损至5.443°时,动涡旋盘在x、y轴方向上的平均角速度较理想状态下增加了约120%,此时涡旋齿即将发生首次干涉现象。

The motion pair clearance composed of the orbiting scroll and the Oldham’s coupling is easy to cause vibration and impact of the scroll compressor.The dynamic simulation of the orbiting scroll and the Oldham’s coupling was carried out under the condition of low rotational speed.The reason for the impact of the Oldham’s coupling and the orbiting scroll was revealed.The wear between the moving pair increased the impact between the Oldham’s coupling and the orbiting scroll,the wear characteristics of the Oldham’s coupling and the orbiting scroll during the working process of the scroll compressor were experimentally studied,so as to predict the working life of the scroll compressor.It is found that the impact of the Oldham’s coupling key on the frame keyway is more severe than it on the orbiting scroll keyway,and the motion pair clearance composed of the Oldham’s coupling and the orbiting scroll keyway has a significant positive correlation with the rotation phenomenon of the orbiting scroll,excessive rotation of the orbiting scroll can easily lead to the interference of the scroll teeth.When the contact angle between the Oldham’s coupling key and the orbiting scroll keyway is worn to 5.443°,the average angular velocity of the orbiting scroll in the x and y axes increases by about 120%compared with the ideal state,and the first interference phenomenon of the scroll teeth is about to occur at this time.