基于声学负载的直线压缩机参数反求

Reverse Measurement of Linear Compressor Parameters Based on Acoustic Load

直线压缩机由于结合了直线电机驱动、柔性板弹簧支撑以及无油间隙密封等技术,具有寿命长、振动低、可靠性高等优势,现已发展成为斯特林型低温制冷机高效可靠运行的关键。直线压缩机由电、机械和声学三部分组成,其中低温制冷机提供等效声学阻抗。声阻抗直接影响着直线压缩机的工作特性。本文从直线压缩机的声阻抗特性出发,分析了其对直线压缩机输出特性的影响规律。进一步提出了基于声学负载的直线压缩机机械弹簧刚度、动子质量、电机比推力以及机械阻尼系数的反求方法,以期为直线压缩机阻抗匹配及其性能检测提供参考。

Combining the technologies of linear motor,flexure bearing and oilfree clearance seal, a linear compressor has advantages such as long life, low vibration and high reliability, which make it a key to insure the high performance of a Stirlingtype cryocooler. A linear compressor can be divided into three parts, those are electric, mechanical and acoustic parts, in which acoustic load is provided by a cryocooler. The acoustic impedance significantly effect the performance of a linear compressor. In this paper, the acoustic impedance characteristics are analyzed, and from this point of view, an reverse measurement method of the spring stiffness, the moving mass, the specific motor thrust and the damping coefficient is proposed, it is expected to provide reference for impedance match and performance test of a linear compressor.