| 左晓甜，郭树国，金子云.带有反向螺纹的同轴变速单螺杆三维流场分析[J].中国油脂,2025,50(01):.[ZUO Xiaotian，GUO Shuguo，JIN Ziyun.Three dimensional flow field analysis of coaxial variable speed single screw with reverse thread[J].China Oils and Fats,2025,50(01):.] |
| 带有反向螺纹的同轴变速单螺杆三维流场分析 |
| Three dimensional flow field analysis of coaxial variable speed single screw with reverse thread |
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| DOI：10.19902/j.cnki.zgyz.1003-7969.240016 |
| 中文关键词: 摆线齿轮减速器 反向螺纹 单螺杆挤出机 |
| 英文关键词:cycloidal gear reducer reverse thread single-screw extruder |
| 基金项目:2022年辽宁省自然科学基金项目（2022-MS-288） |
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| 摘要点击次数: 2 |
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| 中文摘要: |
| 为了改善单螺杆挤出机混炼性能，设计了一种装配内嵌式摆线齿轮减速器和反向螺纹元件的新型螺杆。使用Solid works软件建模，利用ANSYS和CFX软件分析新型同轴变速单螺杆挤出机的流道内三维流场变化，根据流道内的压力、速度矢量、截面速度等变化，探究物料在其流道内的剪切和混合情况。结果表明：在外部情况相同时，新型螺杆建压能力弱于传统螺杆，即新型螺杆的挤出效率较低；新型螺杆因为装配内嵌式摆线齿轮减速器使其混炼区域的速度降为传统螺杆的1/6，引起物料对流，加快压力场变化，使其速度流线更加混乱；新型螺杆因为装配有反向螺纹元件，使其混炼区域出现反向建压能力，在此作用下物料出现反向速度，出现回流现象。综上，摆线齿轮减速器和反向螺纹元件均延长了物料在流道内的停留时间，增加了物料的挤压剪切次数，从而增强了挤出机的混合分布能力和挤压剪切效果。 |
| 英文摘要: |
| In order to improve the mixing performance of a single-screw extruder, a new screw assembled with an embedded cycloidal gear reducer and reverse thread was designed. Solid works software was used for modeling and ANSYS/CFX software was used to analyze the change of three dimensional flow field in the flow channel of the new coaxial variable-speed single-screw extruder, and to explore the shear and mixing of the material in its flow channel according to the change of pressure, velocity vector, and cross sectional velocity in the flow channel. The results showed that in the same external situation, the new screw pressure building capacity was weaker than the traditional screw, i.e., the extrusion efficiency of the new screw was lower. Because of the assembly of embedded cycloidal gear reducer, the speed of the new single-screw extruder in its mixing region decreased to 1/6 of the conventional screw, causing material convection, accelerating the pressure field changes, so that the speed of the flow more chaotic. Because of the assembly of the reverse thread, the reverse pressure building capacity appeared in the mixing region, under which the material appeared to reverse the speed of the phenomenon of reflux. In summary, the cycloidal gear reducer and reverse thread can prolong the residence time of the material in the flow channel, increase the number of the extrusion and shear of material, thus enhancing the mixing and distribution capacity, and the extrusion and shear effect of the extruder. |
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