制冷剂管道参数对冰箱振动影响特性

Influence of refrigerant pipe parameters on vibration characteristics of refrigerator

为减小冰箱振动、降低噪声,利用Pro/Engineer软件分别建立冰箱制冷剂管道内部气柱及管道三维实体模型,用有限元分析软件ANSYS分析模态,获得气柱及管道固有频率。气柱固有频率与压缩机激发频率相差较大不会产生共振,而管道固有频率在共振区内会产生共振。在制冷剂管道材料不变条件下分析不同管道长度、弯管圆角半径及固定支撑位置对冰箱振动特性影响。结果表明,减小制冷剂管道长度会增大固有频率并逐渐远离共振区,从而避免管道共振;增加制冷剂管道弯管圆角半径,其固有频率略有增大,一阶固有频率仍在共振区内导致管道共振;在制冷剂管道不同位置增加固定支撑,能有效提高管道固有频率,使其远离共振区,且存在最佳安装位置。

In order to reduce the vibration and noise of a refrigerator,geometric models of the refrigerant pipe and the gas column in the pipe were created respectively by using Pro / Engineer software,and natural frequencies of the pipe and the gas column were obtained by the modal analysis based on ANSYS software. It is found that gas column resonance will not appear due to the large difference between compressor excitation frequency and the gas column natural frequency,but pipe resonance will occur when the pipe natural frequency is in the resonance zone. The vibration characteristics of the pipes mode of the same material yet with different length,fillet radius and support location were analyzed. The model analysis results show that,the pipe natural frequency increases continuously and gets far away gradually from the resonance zone with the decrease of refrigerant pipe length. The pipe natural frequency is slightly getting higher with the increase of fillet radius,however the pipe resonance will still occur with the first order natural frequency in the resonance zone. The pipe natural frequency can be improved effectively and get far away from the resonance zone by adding supports in different locations,and a best location exists.