微型无油滚动转子压缩机的动力特性与摩擦损失分析

Analysis on dynamic characteristics and friction loss of miniature oil-free rolling piston compressor

微型滚动转子压缩机的无油化带来的摩擦损耗问题不容忽视,研究其摩擦损耗分布规律及其改进措施对提高压缩机效率至关重要,为此,对微型无油滚动转子压缩机主要摩擦副进行了变工况、变结构的摩擦功耗研究。首先,建立了微型无油滚动转子压缩机动力学分析的数学模型;然后,对微型无油滚动转子压缩机主要部件的受力进行了特性分析,并计算获得了主要摩擦副摩擦功耗随主轴转角的变化规律;最后,分析了排气压力、滑片厚度、偏心率和相对气缸长度对微型无油滚动转子压缩机主要摩擦副摩擦功耗及其占比的影响规律。研究结果表明:排气压力从1100 kPa提高至1800 kPa,压缩机总摩擦功耗升高了67.7%;滑片厚度从1 mm提高至3 mm,总摩擦功耗仅升高了32.8%;偏心率从0.06提高至0.2,总摩擦功耗升高了121.5%;相对气缸长度从0.25提高至0.6,总摩擦功耗升高了31.9%。根据分析结果可得出结论:微型无油滚动转子压缩机的偏心率的取值在0.14左右最为合适,优化偏心率对改善微型无油滚动转子压缩机的摩擦损失效果最明显,其次是改变滑片厚度,最后是改变相对气缸长度。

The friction loss caused by the oil-free operation of miniature oil-free rolling piston compressor can not be ignored.Therefore,it is important to know how to reduce the friction loss of miniature oil-free rolling piston compressor.For this purpose,a study was conducted on the friction power consumption of the main friction pairs of miniature oil-free rolling piston compressor under varying operating conditions and structures.Firstly,a mathematical model for the dynamic analysis of miniature oil-free rolling piston compressor was established.Then,the force characteristics of the main components of the miniature oil-free rolling piston compressor were analyzed,and the variation law of the friction power consumption of the main friction pair with the spindle angle was calculated.Finally,the influence of exhaust pressure,slide thickness,eccentricity,and relative cylinder length on the friction power consumption and proportion of the main friction pairs in miniature oil-free rolling piston compressor were analyzed.The research results show that the discharge pressure of the miniature oil-free rolling piston compressor increase from 1100 kPa to 1800 kPa,and the total friction power consumption increase by 67.7%,while the total friction power consumption only increase by 32.8%.The eccentricity of the miniature oil-free rolling piston compressor increases from 0.06 to 0.2,and the total friction power consumption increase by 121.5%.The relative cylinder length of the miniature oil-free rolling piston compressor increases from 0.25 to 0.6,and the total friction power consumption increase by 31.9%.According to the analysis results,the most suitable eccentricity value for the miniature oil-free rolling piston compressor is around 0.14.The optimized eccentricity has the most significant effect on improving the friction loss of the miniature oil-free rolling piston compressor followed by changing the thickness of the sliding plate,and finally changing the length of the corresponding cylinder.