制冷与空调

为解决某空调器室外机启动工况下的管路应力问题，首先通过振动试验分析压缩机的瞬态振动特性，分析问题原因。然后建立管路振动有限元分析模型，以压缩机储液器上盖处的冲击响应谱作为激励，分析管路振动应力，并提出优化方案。结果表明：空调器启动瞬间压缩机最大切向振动加速度为稳定运行阶段的7.9倍，该冲击载荷激发了压缩机的刚体模态和吸气管路模态，进而引发吸气管口应力问题；管路优化方案的最大振动应力仿真值为34.3 MPa,相比原方案仿真值(65.9 MPa)降低47.2%,经试验验证有效。研究结果对采用定频滚动转子式压缩机的空调器启动管路应力分析和优化设计具有参考价值。

In order to solve the problem of pipeline stress during the start-up phase of the outdoor unit of an air conditioner, the transient vibration characteristics of the compressor are analyzed through vibration experiments firstly, and the causes of the problem are discussed. Secondly, the finite element analysis model of pipeline vibration is established, and the shock response spectrum at the upper cover of the compressor reservoir is used as the excitation to analyze the pipeline vibration stress, as well as an optimization scheme is proposed. The results show that the maximum tangential vibration acceleration of the compressor at the starting moment is 7.9 times that of the stable operation stage. The compressor impact load excites the rigid modes of the compressor and modes of suction pipeline, thus leading to the stress problem of inlet suction pipe. The maximum vibration stress of the pipeline optimization scheme is 34.8 MPa, which is 47.2% lower than that of the original scheme(65.9 MPa), and it is verified to be effective by tests. The research results have reference value for the pipeline stress analysis at start-up and optimization design of the air conditioner with the constant frequency rolling rotary compressor.