流体机械

2020, v.48;No.581(11) 37-41+72

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分层采油泵迷宫密封的泄漏特性研究
Investigation on Leakage Characteristics of Labyrinth Seal for Layered Oil Pump

李小龙;刘旭辉;程亮;孙巧雷;杜宇成;
Li Xiaolong;Liu Xuhui;Cheng Liang;Sun Qiaolei;Du Yucheng;School of Mechanical Engineering,Yangtze University;Oil and Gas Drilling and Well Completion Tools Research Center of Hubei Province;Hubei Cooperative Innovation Center of Unconventional Oil and Gas;

摘要(Abstract):

针对分层采油泵内柱塞与泵筒间隙密封泄漏问题,为探究分层采油泵迷宫密封机理和分层采油泵密封槽在不同泵间隙下适用的油液黏度范围,基于计算流体动力学理论对其间隙流场进行数值模拟分析。分析结果表明:油液通过节流间隙将压力能转化为动能,进入密封槽后形成1个大涡流和3个小涡流将动能转化为热能,从而达到密封作用;对于一级泵间隙,当油液黏度大于2 mPa·s时,纯间隙段阻流效果优于密封槽段;对于二级泵间隙,当油液黏度大于2.5 mPa·s时,纯间隙段阻流效果优于密封槽段;对于三级泵间隙,当油液黏度在1~6 mPa·s区间时,密封槽段阻流效果始终优于纯间隙段。研究结果可为分层采油泵的现场应用提供理论依据和参考。
In view of leakage in the labyrinth gap between plunger and pump cylinder in layered oil pump,in order to investigate the labyrinth sealing mechanism of layered oil pumps and the applicable oil viscosity range of the sealing groove of layered oil pumps under different pump clearances,the clearance flow field of the layered oil pump was simulated based on the theory of computational fluid dynamics.The results show that the pressure energy is converted into kinetic energy through the throttling clearance,and a large eddy current and three small eddies are formed after the oil liquid enters the sealing groove to convert kinetic energy into thermal energy,thus achieving sealing effect;For the primary pump clearance,when the oil viscosity is greater than2 mPa·s,the blocking effect of the pure clearance section is better than that of the sealing groove section;for the secondary pump clearance,when the oil viscosity is greater than 2.5 mPa·s,the blocking effect of pure clearance section is better than that of sealing groove section;for the three-stage pump clearance,when the oil viscosity is between 1 mPa·s and 6 mPa·s,the blocking effect of sealing groove section is always better than that of pure clearance section.The research results can provide theoretical basis and reference for the structural design and field application of layered oil pump.

关键词(KeyWords): 分层采油泵;迷宫密封;油液黏度;CFD;泄漏量
layered oil pump;labyrinth seal;oil viscosity;CFD;leakage

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基金项目(Foundation): 国家科技重大专项(2016ZX05038-002-LH001)

作者(Author): 李小龙;刘旭辉;程亮;孙巧雷;杜宇成;
Li Xiaolong;Liu Xuhui;Cheng Liang;Sun Qiaolei;Du Yucheng;School of Mechanical Engineering,Yangtze University;Oil and Gas Drilling and Well Completion Tools Research Center of Hubei Province;Hubei Cooperative Innovation Center of Unconventional Oil and Gas;

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