某离心压缩机首级叶轮叶片断裂事故分析与改进研究

摘要

An impeller blade fracture accident was studied in this paper. The reason of the blade fracture was analysed, and we found that the fracture of the blade was mainly caused by the resonance because the frequency of the impeller was close to the frequency of the wake of the inlet guide vane. Based on the analysis above, two improvements were presented as follows. One was to increase the thickness of the blades to avoid the natural frequency of the impeller with the frequency of the wake of the inlet guide vane. The other was to cut off the axial length of the blade by 14.4 mm to decrease the exciting force of the wake of the inlet guide vane. The site operation of the improved impeller is good until now.%本文研究了某离心压缩机首级叶轮叶片断裂事故。分析了该叶片发生断裂的原因，发现该事故主要是由于叶轮固有频率与进口导叶尾迹频率接近发生共振引起的。在此分析基础上，提出了以下改进措施：一方面通过增加叶片厚度来改变叶轮固有频率，以避开进口导叶尾迹频率；另一方面，同时通过叶片进口处沿轴向切除14.4mm，以减小进口导叶尾流激振力。到目前为止，改进后的叶轮现场运行情况良好。