涡旋压缩机激励载荷反求分析

涡旋压缩机在匹配空调系统时,其振动会通过吸排气管对空调系统管路应力应变产生较大影响,为了得到对空调系统振动激励的大小,提出通过涡旋压缩机振动位移响应反求激励载荷的方法,并对反求时振动响应测点位置、测点个数进行了分析与探讨,最终得到了某型号涡旋压缩机激励反求力和力矩的大小及添加方式。结果显示,涡旋压缩机与转子压缩机有较大差异,其激励载荷主要以不平衡离心力为主,可忽略力矩的影响,且激励载荷与运行频率的平方成线性关系,运行频率越高,不平衡离心力越大。另外,以反求的结果作为载荷,通过MSC频率响应分析仿真吸排气管的振动位移响应,将其与吸排气管路的试验结果对比,发现整个运行频率范围内结果一致性较好,验证了激励载荷反求方法的准确性。

Analysis of Backward Formulation Method for Excitation Load of Scroll Compressors

When the scroll compressor is installed to the air-conditioner,its vibration will have a great influence on the stress and strain of the air-conditioner pipeline through the suction and exhaust pipes.In order to obtain the magnitude of the vibration excitation of the compressor to the air conditioning system,the method of backward formulation for the excitation load through the vibration displacement response is proposed.Then the position and the number of measurement points for the vibration response are analyzed and discussed.Finally,the magnitude and loading manner of the excitation force and the torque of the scroll compressor are obtained.The results show that there is a great difference between the scroll compressor and the rotor compressor.The excitation load of scroll compressor is mainly the unbalanced centrifugal force and the influence of the torque can be ignored.And the excitation load has a linear relationship with the square of the running frequency.The higher the running frequency is,the greater the unbalanced centrifugal force is.In addition,taking the result from the backward simulation as the load,the vibration displacement response of the suction and exhaust pipe is simulated by MSC software.Meanwhile,it is found that the results of simulation and test of suction and exhaust pipe are in good agreement in the whole operating frequency range.The backward formulation method of the excitation load is well verified.