卧式螺旋卸料沉降离心机螺旋空心轴内表面磨损的研究  

Study of the erosion phenomenon on the inner surface of the spiral hollow shaft of decanter centrifuge

作　　者：袁惠新[1] 王伟鹏 付双成[1] 戴如昊 周发戚 YUAN Huixin;WANG Weipeng;FU Shuangcheng;DAI Ruhao;ZHOU Faqi(School of Mechanical Engineering and RALL Transit,Jiangsu Key Laboratory of Green Process Equipment,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学机械与轨道交通学院、江苏省绿色过程装备重点实验室,江苏常州213164

出　　处：《流体机械》2023年第12期9-15,共7页Fluid Machinery

基　　金：国家自然科学基金项目(21676031);江苏省高校自然科学研究项目(19KJB530003)。

摘　　要：针对卧式螺旋卸料沉降离心机螺旋空心轴因磨损产生的偏心、振动、甚至漏料等问题,通过试验和数值模拟研究螺旋空心轴内表面上微凸和微凹缺陷对壁面磨损的影响。结果表明,微凸起处的磨损区主要分布在其迎流面处的底部和微凸起进料端附近壁面,且微凸起上的磨损率在其轴向位置上呈两端高、中间低的分布,距离进料端位置的磨损率更高,磨损率与处理量呈正相关。如进料流量从1.37 m^(3)/h增加至2.74 m^(3)/h时,微凸起磨损率峰值从6.20×10^(-4)kg/(m^(2)·s)增加至1.63×10^(-3) kg/(m^(2)·s);下凹缺陷的磨损区主要分布在其背流面,磨损率峰值随着缺陷直径增加而变大。如缺陷直径从1 mm增加至2 mm时,缺陷处磨损率峰值从3.77×10^(-4)kg/(m^(2)·s)增加至6.02×10^(-4)kg/(m^(2)·s),且下凹缺陷处存在明显的磨损集中现象。研究结果可为螺旋空心轴的防磨设计提供依据。The effect of micro-convex and micro-concave defects on the inner surface of the spiral hollow shaft on wall wear was investigated through tests and numerical simulations for eccentricity,vibration and even material leakage due to wear of the spiral hollow shaft in decanter centrifuges.The results show that the erosion area of the microconvex location is mainly distributed at the bottom of its windward side and wall surface near the feed end,and the erosion rate at the microconvex location is high at both ends and low in the middle in its axial position,and the erosion rate near the feed end is higher,and the erosion rate is positively correlated with the throughput.For example,the peak erosion rate at the micro-convex location increases from 6.20×10^(-4) kg/(m^(2)·s)to 1.63×10^(-3) kg/(m^(2)·s)when the feed flow rate increases from 1.37 m^(3)/h to 2.74 m^(3)/h.The erosion area of the concave defect is mainly distributed at its lee side,and peak erosion rate increases with increasing defect diameter.If the defect diameter increases from 1 mm to 2 mm,the peak erosion rate at the defect increases from 3.77×10^(-4) kg/(m^(2)·s)to 6.02×10^(-4) kg/(m^(2)·s)and there is an obvious erosion concentration phenomenon at the concave defect.The results of the study can provide a basis for the design of anti-friction spiral hollow shafts.

关 键 词：卧式螺旋卸料沉降离心机 螺旋空心轴 缺陷 壁面磨损 数值模拟 

分 类 号：TH117.2[机械工程—机械设计及理论]