线性压缩机变容量性能实验研究

通过对开发的线性压缩机进行变容量调节性能实验,进行不同容量百分比条件下的效率分析.结果显示,当通过减小活塞行程实现变容量调节时,电机效率受频率特性的影响较大,在频率比接近1.0时,电机效率最高.绝热效率与活塞的摩擦损耗和吸排气阀开关损耗有关,随着活塞行程的增加,摩擦损耗也增加,但吸排气阀的开关损耗基本不变,绝热效率随着行程的增加先增大后减小.同样的行程条件下,排气压力越高,气体压缩功越高,但机械损耗不变,因而绝热效率越高.

Investigation on Variable Capacity Performance of Linear Compressor

Through the experiments of variable capacity adjustment on the developed linear compressor,the efficiency characteristics on different discharge volume was analyzed.The experimental results show that the motor efficiency will be affected greatly by the frequency features when the variable volume is adjusted by changing the piston stroke.The highest motor efficiency will occur on the condition that the frequency ratio nears to 1.0.The adiabatic compression efficiency of the linear compressor depends on the friction loss of piston and switching loss of suction valve and discharge valve.As the piston stroke increases,the adiabatic compression efficiency increases firstly and then decreases for the friction loss increases with the increasing of piston stroke,while the switching loss of valves keeps unchanged.On the same piston stroke,the adiabatic efficiency increases with the increasing of discharge pressure for the gas compression work increases with the discharge pressure,while the mechanical loss keeps unchanged.