线性压缩机壳体温度场研究及其结构优化

Study on the temperature field of linear compressor shells and the structural optimization

针对线性压缩机在高温环境下寿命缩短、安全性降低的问题,为了保证其合适的工作温度范围,开展了压缩机壳体内部温度场的分析与结构优化方案的对比研究。运用Fluent软件建立了压缩机壳体内部结构的耦合模型,计算了压缩机壳体在内热源线圈发热时的瞬态温度场分布,同时采取4种进出口方案的形式,以线圈与排气口的最高温度385 K为指标,分析对比了不同位置进出口条件下,排气口与线圈的最高温度。研究结果表明:进排气口的轴线位置与线圈轴线位置同时在同一轴线时线圈达到热平衡时的温度最低为365 K,进排气口位置的不同组合线圈的温差达20 K。以改进压缩机壳体的结构,并为不同型线的压缩机壳体数学模型的建立和型线优劣评判提供参考依据。

Linear compressors suffer from such problems as shortened service life and a lower standard of safety in the hightemperature environment.In this article,in order to ensure that the range of operating temperature is proper,the analysis is conducted on the temperature field of compressor shells;the comparative study is carried out on the structural optimization.The software Fluent is adopted to set up the coupling model of the shell’s structure;the transient temperature-field distribution is calculated when the compressor shell is heating at the heat-source coil.Meanwhile,four solutions of inlet and vent are taken,with the highest temperature of 385 K at the coil and vent as the indicators.The analysis is conducted on the highest temperature at the coil and vent under different conditions.The results show that when the inlet-vent axis and the coil axis are placed on the same axis,the coil temperature reaches the thermal balance at the minimum 365 K,and the temperature difference between the combined coils at the inlet and vent reaches 20 K.This study aims at the structural optimization of the compressor shell as well as provides reference for how to set up mathematical models of compressor shells with different profile and how to evaluate the profile.