跨临界二氧化碳压缩膨胀机的研究  

STUDY ON TRANSCRITICAL CARBON DIOXIDE EXPERSSOR

作　　者：李敏霞[1] 马一太[1] 苏维诚[1] 管海清[1] 

机构地区：[1]天津大学热能研究所,天津300072

出　　处：《机械工程学报》2005年第10期153-158,共6页Journal of Mechanical Engineering

基　　金：高等学校博士学科专项科研基金资助项目(D0200105)。

摘　　要：为提高二氧化碳跨临界循环效率,解决系统节流损失大的问题,研究开发了新型的滚动活塞转子式压缩膨胀机,来代替二氧化碳跨临界系统中的节流阀。给出了滚动活塞转子式压缩膨胀机的设计思路和设计特点。对压缩膨胀机主轴的受力和力矩进行了分析和计算,分析结果表明在二氧化碳压缩膨胀机工作过程中,两个气缸内的流体流动过程相反,作用于主轴上的作用力和力矩的大小、方向都不相同,选择两个偏心轮合适的相位角有利于主轴上总力矩的平稳变化,设计时应选择最佳相位角,但同时两个偏心轮之间的主轴部分将是最薄弱的环节。The transcritical carbon dioxide rolling piston expressor （expander-compressor） is developed to replace the throttling valve in the CO2 transcritical cycle for the improvement of the performance efficiency of the CO2 transcritical cycle and decreasing larger throttling losses. The design consideration and the feature of the rolling piston type expressor are presented. The torque of the shaft of this type of expressor are calculated and analyzed. The researches show that the value and direction of forces on the shaft produced by the fluid in two cylinders are different due to the opposite flow process in the expander from that in the compressor and the proper phase of two-rolling piston can allow the expressor to take over the low-vibration characteristics. So the optimum phase of two cranks should be taken into account in the design. In addition, the analytical results also show that the shaft between two cranks is the part that is easy to break.

关 键 词：二氧化碳 跨临界循环 压缩膨胀机 

分 类 号：TU83[建筑科学—供热、供燃气、通风及空调工程]