低温制冷机用线性压缩机效率的理论及实验研究

Theoretical and experimental investigations on the efficiency of linear compressors for cryocoolers

为了提高低温制冷机整机效率,基于力的平衡及电压平衡方程理论,分析了线性压缩机电机效率及电功转化为活塞表面声功效率的影响因素;并对线性压缩机效率进行了实验测量;理论与实验吻合较好;电机效率、电功转化为声功效率测量值与理论值偏差分别在3%及7%以内。最后对冷指确定时线性压缩机的优化设计方法进行了总结。

In order to increase the total efficiency of the Stirling cryocooler and Stirling - type pulse tube cryocooler, theoretical analysis was carried out on the efficiency of the motor and transduction efficiency of electrical power to acoustic power at the piston surface of the linear compressor based on the force balance and voltage balance equation. The two efficiencies of two different linear compressors connected with cold fingers were measured. The calculated results agreed well with the test values, and the differences between the experimental results and the theoretical values were respectively 3% for the efficiency of the motor and 7% for the transduction efficiency of electrical power to acoustic power at the piston surface of the linear compressor. At last the optimal.design method of the linear compressor with known load impedance was summarized.