变工况隔膜压缩机曲轴动力学仿真分析

Dynamic Simulation Analysis of Diaphragm Compressor Under Variable Working Conditions

隔膜压缩机通过活塞运动挤压膜片达到压缩气体的作用,而这一过程中产生的排油压力会导致各传动部件受到复杂的交变载荷,而像曲轴等重要部件上则会产生较大的应力应变,这些复杂的作用力会引发曲轴等部件的强烈振动。针对这一问题,采用理论分析与ADAMS刚柔耦合仿真方法,对一台排气压力为45MPa隔膜压缩机的往复运动机构进行分析,结果表明:在额定工况下,曲柄销径向最大受力约为70282.4N,切向最大受力约为72593.2N,曲轴上最大应力值为141.36MPa,最大变形量为0.108mm;而对不同工况的分析结果显示,排气压力升高、曲轴转速变大都会导致曲轴上的应力增大。其中,转速变大对应力值的影响较小,而排气压力升高则对应力值的影响较大。

The diaphragm compressor compresses the diaphragm through the piston movement to compress the gas,and the oil discharge pressure generated in this process will cause the transmission components to be subjected to complex alternating loads,and important components such as crankshafts will produce large stress and strain,and these complex forces will cause strong vibration of components such as crankshafts.In order to solve this problem,the reciprocating motion mechanism of a diaphragm compressor with an exhaust pressure of 45MPa is analyzed by theoretical analysis and ADAMS rigid-flex coupling simulation method,and the results show that under rated working conditions,the maximum radial force of the crank pin is about 70282.4N,the maximum tangential force is about 72593.2N,the maximum stress value on the crankshaft is 141.36MPa,and the maximum deformation is 0.108mm.Increasing the crankshaft speed will lead to increased stress on the crankshaft.Among them,the increase of the speed has little effect on the stress value,while the increase of the exhaust pressure has a greater impact on the stress value.