空调室外机低频振动原因分析和解决途径探讨

Low frequency vibration analysis and solution for air conditioner outdoor unit

低频振动是导致空调室外机存在异常噪音的重要原因,甚至在大量案例中,低频振动会经由墙体传入室内侧,因此,室外机低频振动会严重影响消费者的使用体验。本文通过对典型案例进行频谱分析,确认了压缩机振动传递至室外机钣金结构,是导致室外机产生低频振动的主要原因。在此基础上,本文进一步探讨了通过隔离压缩机振动,降低室外机低频振动的可行技术手段,利用模态分析和瞬态仿真计算,确认降低了回气管固有频率,是显著降低室外机低频振动的最有效技术手段,同时,降低压缩机脚垫硬度对室外机低频振动也有明显的改善。最后,本文通过对比试验测试,验证了室外机低频振动的主要解决途径。

Low frequency vibration is an important cause of air conditioner outdoor unit （ODU） abnormal noise, even in many cases, low frequency vibration and noise can go through the wall into the room, therefore, the ODU vibration will affect the consumer experience seriously. In this paper, the typical cases is analyzed, as a result, the main reason for ODU vibration is identified as the vibration of compressor transmitting to the sheet metal structure. Based on it, the technical solution for compressor vibration isolation and ODU low frequency vibration decrease is analyzed by modal analysis and transient dynamic simulation. As a result, decreasing suction pipe natural frequency is considered as the most effective way to reduce the ODU low frequency vibration. Meanwhile, decreasing the hardness of the compressor base rubber is both considered as an effective way to reduce the ODU low frequency vibration. The comparing tests are performed to validate the solutions raised by this paper.