制冷剂溶解性对连杆轴承润滑特性的影响研究

Research on the Effect of Refrigerant Solubility on the Lubrication Characteristics of Connecting Rod Bearings

制冷压缩机中实际的润滑环境为非纯油状态下的混合润滑,制冷剂溶解于润滑油会导致压缩机连杆轴承的润滑性能下降,目前尚未对其展开深入研究。以制冷剂R600a/矿物油Azmol混合液相为润滑介质,建立基于制冷剂溶解度的润滑模型,研究不同负荷工况下溶解度对小型制冷压缩机连杆轴承润滑特性的影响规律。研究结果表明:在不同工况下,考虑溶解度影响后,轴承最小油膜厚度最大减小18.51%,最大油膜压力最大增加7.08%,摩擦功耗最大下降19.90%,端泄流量最大增加29.62%。该溶解度润滑模型为小型制冷压缩机连杆轴承摩擦副的失效机理分析提供了新的思路,对压缩机过负荷工况设计、轴承间隙及环境温度控制具有重要的指导意义。

The actual lubrication environment in refrigeration compressors is mixed lubrication in the state of impure oil.The refrigerant dissolves in the lubricating oil will cause the lubricating performance of the connecting rod bearings of the compressor to decline.At present,no in-depth research has been carried out on it.The refrigerant R600 a/Azmol mineral oil mixed liquid phase is used as the lubricating medium to establish a lubrication model based on the solubility of the refrigerant,and to study the effect of solubility on the lubrication characteristics of the connecting rod bearings of small refrigeration compressors under different load conditions.The results show that under different working conditions,after considering the effect of solubility,the minimum oil film thickness of the bearing is reduced by a maximum of 18.51%,the maximum oil film pressure is increased by a maximum of 7.08%,the friction power consumption is decreased by a maximum of 19.90%,and the end discharge flow is increased by a maximum of 29.62%.The solubility lubrication model provides a new idea for the analysis of the failure mechanism of the connecting rod bearing friction pair of small refrigeration compressors,and has important guiding significance for the compressor overload condition design,bearing clearance and environmental temperature control.