滑片膨胀机槽底引压结构的研究  

Investigation on the Rotary Vane Expander by Introducing High Pressure into Vane Slots

作　　者：贾晓晗[1] 张波[1] 浦磊[1] 彭学院[1] 

机构地区：[1]西安交通大学能源与动力工程学院压缩机研究所,西安710049

出　　处：《西安交通大学学报》2011年第7期60-64,105,共6页Journal of Xi'an Jiaotong University

摘　　要：针对滑片膨胀机工作过程中高压进口流体在经过吸气孔口时对滑片冲击而造成滑片被压入槽底且无法与气缸内壁正常接触的问题,提出了一种滑片槽底引压结构.该结构将高压流体引入滑片槽底容积腔内,通过引入槽底的高压气体力来削弱进气冲击影响,保证滑片与气缸内壁良好接触.通过理论计算,得出了槽底引压结构的最优结构参数;通过比较无引压和有引压结构的膨胀机在相同工况下的实验结果,得出了引压结构对膨胀机工作过程中动力过程和热力过程的影响机理.研究结果表明:利用槽底引压结构,膨胀机能够在跨临界CO2制冷系统中稳定运行;滑片与气缸内壁贴合情况大幅改善,膨胀机性能大幅提高,输出功率最高达到了682 W,绝热效率最高值从无引压时的23.7%增长到有引压时的49.8%.An improved structure was suggested by introducing high pressure gas into the vane slots to ensure the contact between the vane tip and the cylinder wall in a rotary vane expander.The theoretical analyses and calculations were performed to obtain the optimum parameters of the improved structure.The experiments were conducted on the improved expander prototype with and without introducing high pressure gas under the same working conditions to explore the influence of the improved structure on the vane movement and thermodynamic process of the expander.The results show that the expander with the improved structure could run steadily in a trans-critical CO2 refrigeration system.The contact between the vane tip and the cylinder wall improved well and the leakage between each chambers decreased.The maximum work output was 682 W,and the maximum volumetric efficiency was 35.1%,and the maximum isentropic efficiency reached 49.8% when the rotate speed was 1 200 r/min.

关 键 词：膨胀机 跨临界循环 泄漏 高压气体 

分 类 号：TB653[一般工业技术—制冷工程]