滚动转子压缩机四倍频异常振动控制

FOUR OCTAVE ABNORMAL VIBRATION CONTROL OF ROTARY COMPRESSOR

空调压缩机的振动、噪声水平是衡量压缩机质量的重要性能指标之一.本文针对某型号滚动转子压缩机在特定频段4倍频振动幅值大于1倍频振动幅值问题,进行了扫频阶次分析、实验模态分析和振动噪声源识别等测试分析,确定了结构共振是导致4倍频超标的原因,提出了增加储液器质量和加强储液器托架刚度两种方案控制4倍频振动.实验测试表明,两种方案均改变了压缩机的固有振动特征,有效的降低了4倍频振动幅值,加强储液器托架刚度方案具有更小的振动响应.

The vibration and noise level of air condition compressor is one of the important performance index for the compressor quality. This paper focuses on a problem that the vibration amplitude of 4 octave at a particular frequency range is greater than that of 1 octave for the rolling rotor compressor. Through analyzing the frequency sweep and experimental modal,and identifying noise source,it is determined that structure resonance causes the happen of exceeding the standard for 4 octave. Meanwhile,two control methods for 4 octave vibration are proposed to increase the quality of accumulator and strengthen the stiffness of accumulator bracket. Moreover,experimental results show that these two methods improve the natural vibration characteristics of the compressor which effectively reduce the amplitude of 4 octave vibration,and the way to strengthen the stiffness of accumulator bracket produces smaller vibration response.