运动副间隙对涡旋压缩机切向泄漏间隙的影响

针对曲柄销防自转机构涡旋压缩机运动副间隙引起的切向泄漏问题,基于机构学原理简化的平行四杆机构模型,利用连续接触模型,将含间隙的机构转化为多构件多自由度无间隙的机构进行分析,并借助Matlab数值分析软件得出防自转曲柄销处间隙值对动涡旋自转角及切向泄漏间隙的影响.结果表明:动涡盘自转使得泄漏间隙变化量随主轴转角周期性变化,且随着间隙值的增大而增大;反向自转形成的负值间隙变化量使动静涡旋齿磨损增大.因此,在压缩机设计时应严格选用配合公差,减少配合间隙带来的不利影响.

Effect of kinematic pair clearance in scroll compressor on its tangential leakage gap

Aimed at the problem of tangential leakage caused by kinematic pair clearance in scroll compressor with autorotation prevention mechanism of crankshaft pin and based on the parallel four-bar linkage model simplified with principle of mechanism, a mechanism with clearance in itself is converted into one with multiple components, multiple degrees of freedom and no gap, and analyzed there after, so that the influence of the clearance magnitude at anti-rotation crank pin on the autorotation angle and tangential leakage gap is determined with the help of Matlab numerical analysis software. The results show that the autorotation of the movable scroll disk will make the magnitude of leakage gap to change periodically with the rotation angle of the spindle and increase with the increase of the gap magnitude. The amount of change of the negative gap caused by the reverse rotation will make the wear of the movable and static scroll teeth increased. Therefore in the design stage of the compressor, the fitting tolerances should be strictly selected to reduce the adverse effect of the fitting clearance.