• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (3): 51-56.doi: 10.3901/JME.2017.03.051

• 机构学及机器人 • 上一篇    下一篇

差速螺旋啮合双转子端面型线的统一几何设计及模拟

王克俭, 汪廷飞   

  1. 北京化工大学机电工程学院 北京 100029
  • 出版日期:2017-02-05 发布日期:2017-02-05
  • 作者简介:

    作者简介:王克俭(通信作者),男,1971年生,博士研究生导师。主要研究方向为成型制造。

    E-mail:wangkj@mail.buct.edu.cn

United Geometrical Design and Simulation of Sectional Profiles
for Twin Rotors in Differential Screw Coupling

WANG Kejian, WANG Tingfei   

  1. College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing 100029
  • Online:2017-02-05 Published:2017-02-05

摘要:

为了更全面描述啮合差速转子的端面,通过引入变符系数,采用相对运动法,推导了适合同向和异向的差速转子端面型线的统一啮合方程。通过改变差速比或者头数比及其他参数,可以得到不同新型的转子端面型线。用此模型建立了差速比为3:1、同向和异向的等径不等导程双螺旋转子混合段。应用Polyflow软件,有限元数值模拟了高密度聚乙烯熔体在两种啮合旋向下的流动混合效果。异向差速螺纹元件有长而窄的均匀停留时间,分布混合能力较好;同向差速螺纹元件的拉伸混合、剪切作用大,分散混合能力较强。

关键词: 端面型线, 混合, 数值模拟, 统一几何设计, 差速螺旋啮合双转子

Abstract:

For comprehensive description of differential rotors’ sections, one united geometrical design model is developed using relative motion method by introducing minus-plus transition coefficient for design sectional profiles of both co-rotational and counter-rotational twin rotors. From which, different types of novel rotors’ sectional profiles can be established by varying differential ratio and screw head number as well as other structural parameters. As an example, the model is used to form one mixing part constituted from double screw rotors of the same diameter and the different screw pitches with differential ratio of 3:1 either in co- or in counter-rotation. Polyflow software is used in finite element analysis numerical simulation of high density polyethylene melt in flow mixing for both coupling directions. It is shown that double differential counter-rotors exhibit uniform, longer residence time and smaller range of residence time distribution showing better distributive mixing capability in contrast with stronger extensional mixing and shear function showing better dispersive mixing capability for double differential co-rotors.

Key words: mixing, numerical simulation, sectional profiles, united geometrical design, twin rotors in differential screw coupling