有阀线性压缩机吸气阀片位移特性的可视化实验

Visualization Experiment of Displacement Characteristics of Suction Valve in a Valved Linear Compressor

吸气阀作为J-T节流制冷机用有阀线性压缩机的核心部件,其位移特性会直接影响有阀线性压缩机性能。为了揭示吸气阀片位移特性,本文建立了阀片位移模型,理论分析了阀片厚度、升程和运行频率对阀片位移变化的影响,搭建了可视化实验台,测量并研究了不同工况下的阀片位移变化和压缩机效率。结果表明:采用0.2 mm吸气阀片厚度,0.38 mm升程时现有的有阀线性压缩机可获得最佳性能。设计合理的阀片升程限位器高度,可提高压缩机性能,同时阀片形变及冲击所受应力较小。运行频率较低时,阀片产生颤振现象,压损增大。该研究结果可为簧片阀组的优化和可靠性设计提供参考。

As the core component of a valved linear compressor for a Joule-Thompson throttling refrigerator,the displacement characteristics of the suction valve directly affect the compressor′s performance.A valve-displacement model was established to determine the displacement characteristics of the suction valve.The effects of the valve thickness,lift,and operating frequency on the displacement change of the valve were analyzed theoretically.A visualization experimental bench was constructed to measure and study the displacement changes in the valve and compressor efficiencies in different working conditions.The results showed that the valved linear compressor demonstrated the best performance when the thickness of the suction valve plate was 0.2 mm and that of the lift was 0.38 mm.Reasonable design of the valve-lift limiter height can improve the performance of the compressor,with less stress on the valve deformation and impact.At lower operating frequencies,the valve developed flutter,increasing the pressure loss.The research results can provide a reference for the optimization and reliable design of reed valve manifolds.