双螺杆真空泵工作过程中容积及气体状态变化分析  

Modeling and Analysis of Air Compression in Single-Thread Twin-Screw Vacuum Pumps

作　　者：徐飞[1] 潘成程 谭昱全 汪祚远 冯驹先 干蜀毅[1] 

机构地区：[1]合肥工业大学机械与汽车工程学院,合肥230009

出　　处：《真空科学与技术学报》2015年第11期1300-1304,共5页Chinese Journal of Vacuum Science and Technology

摘　　要：以常见单头等螺距凹齿双螺杆真空泵的齿间容积变化为基础,对工作过程中气体状态的变化进行了总结,对螺杆真空泵的排气口的设计给出了一种方法。建立了一种基于热力学原理的数学模型,对其中的压缩过程进行了计算,并做了验算。本文可为研究螺杆真空泵转子及排气口的设计提供借鉴,为螺杆真空泵工作过程的热力学计算提供参考。The time evolution of the inter-tooth volume, temperature and pressure at the exhaust port of the conven- tional single-thread and fixed pitch twin-screw vacuum pumpsin the four distinctive stages, especially in the compression stage, was empirically approximated, mathematically formulated with the piston model, theoretically analyzed in thermo- dynamics, numerically simulated with software MATLAB, and experimentally measured with the Busch ACO400F vacuum pump. The compression was found to turn into recoiling compression at a time when the inter-tooth volume opens up to the exhaust port and the suction pressure decreases to below 30 kPa. Therecoiling-compression was approximated as the suc- tion of air in fixed-volume adiabatic mode, so the exhausted-air temperature can be calculated.The calculated and mea- sured temperature was found to be in good agreement. We suggest that the results be of some technological interest in de- sign of twin-screw vacuum pump.

关 键 词：螺杆真空泵 排气口 容积变化 排气温度 

分 类 号：TB751[一般工业技术—真空技术]