[关键词]
[摘要]
针对某台轴流式引风机变频改造后频繁发生轴系故障的现象,采用无线应变电测技术测试了轴系扭应力脉动特性。试验发现,风机变频运行在一定转速以上时,传动轴扭应力脉动幅度突增,并一直维持在高位。在运行过程中扭应力脉动频率被锁定,不随转速变化,该现象和扭转共振不同。分析表明,变频器电机传动轴叶轮组成的机电耦联系统出现了扭振失稳。提出将轴系上的膜片联轴器改为高弹橡胶联轴器,通过增加系统阻尼的方法抑制扭振失稳。改造前后的试验结果对比表明,高弹联轴器可以有效地抑制轴系扭振失稳。
[Key word]
[Abstract]
In order to solve the failure of an axial flow induced draft fan after the variable frequency driven conversion, the torsional stress pulsation characteristics of the fan were tested by using the wireless strain measurement technology. It was found that the torsional stress fluctuation amplitude increased sharply when the fan was running over a certain rotating speed and then kept high. In this process, the torsional stress pulsation frequency was locked and did not change with the rotation speed, which was different from the phenomenon of torsional resonance. The results showed that the unstable torsional vibration occurred in the electromechanical coupling system composed of frequency converter, motor, shaft and fan. It was proposed to solve the unstable torsional vibration problem by replacing the diaphragm coupler with the high elastic rubber coupler. The experimental results before and after replacement showed that the high elastic coupler could effectively suppress the unstable torsional vibration.
[中图分类号]
TM 351
[基金项目]