R290与R410A旋转式压缩机滑片-活塞摩擦副特性的对比

摘要

为了模拟与压缩机工作状态尽量接近的实验条件,本文在密封的高压环境下测试了在R290/矿物油混合物组合下的滑片-活塞摩擦副的摩擦系数、咬合力和磨损量.测试样件为压缩机中的滑片与滚动活塞量产件,根据压缩机的实际运行工况设定了滑片与滚动活塞间相对滑动速度、负载及润滑油温度等实验条件范围,采用电子扫描镜检测实验后样件的表面形态,并与目前使用量较大的R410A/POE油混合物组合进行对比.结果表明,在R290/矿物油混合物组合下,滑片-活塞摩擦副的摩擦系数比R410A/POE油混合物组合的摩擦系数大0.05 ～0.10,但其咬合负载高出300 N,表明在R290/矿物油混合物组合下,压缩机的抗磨损能力增强,但摩擦功耗也同时增加,需进一步改进.%R290 has been considered for use in air-conditioning systems as a low global wanning potential (GWP) refrigerant.This paper describes the tribological characteristic of the vane-piston tribopair in a R290 rotary compressor.For the purpose of simulating the tribopair working conditions,the vanes and rolling pistons of a compressor were directly adopted as test specimens.All of the tribological tests were performed under sealed high-pressure conditions,with test conditions such as the relative sliding speed,loads,and temperatures set based on actual operating conditions of a compressor,and the friction coefficients,scuffing resistances,and wear depths were measured.Furthermore,the morphological changes were investigated using a scanning electron microscope after the tests.As a comparison benchmark,tests were also conducted using R410A/polyolester oil.From these tests,it was evident that the friction coefficients and scuffing load of the vane-piston interface in the presence of R290/mineral oil were respectively 0.05-0.10 and 300 N higher than those of R410A/polyolester.On the other hand,the wear resistance ability with R290/mineral oil was better than that with R410A/polyolester.