基于单向流固耦合的采油单螺杆泵容积效率分析  

Research on volumetric efficiency of single progressive cavity pump based on unidirectional fluid-solid coupling

作　　者：李大奇[1] 杨其信 杜秀华[1] 赵丰德 聂晓虎 LI Daqi;YANG Qixin;DU Xiuhua;ZHAO Fengde;NIE Xiaohu(School of of Mechanical Science and Engineering,Northeast Petroleum University,Daqing 163318,China)

机构地区：[1]东北石油大学机械科学与工程学院,黑龙江大庆163318

出　　处：《流体机械》2023年第9期51-58,共8页Fluid Machinery

基　　金：黑龙江省重点研发计划项目(GZ20210112)。

摘　　要：为研究采油螺杆泵的容积效率,建立螺杆泵有限元仿真模型,使用流固耦合方法分析单级压差对定子橡胶的变形规律,推导了对螺杆泵定子密封和泄漏影响较大XY方向变形量的计算式。根据定子橡胶变形量和初始过盈量,得到螺杆泵泄漏量,计算出容积效率,并对其进行试验验证;利用该方法,分析了螺杆泵定子导程、初始过盈量、偏心距等结构参数和单级压差、转速、流体黏度等工作参数对容积效率的影响规律,结果表明:容积效率随定子导程的增加而降低,在压差为0.6 MPa下容积效率由47%降至30%;随着初始过盈量的增加而升高,在压差为0.6 MPa下容积效率由31%增至71%;随着单级压差的增加而降低,在过盈量为0.28 mm下容积效率由98%降至16%;随着转速的增加而升高,在过盈量为0.178 mm下容积效率由8%增至69%;随着流体黏度的增大而升高,在过盈量为0.178 mm下容积效率由38%增至85%;随偏心距的增大变化不大,容积效率由96%降至94%。To study the volumetric efficiency of the PCP(progressive cavity pump),the finite element simulation model of the PCP was established to analyze the single-stage pressure difference deformation rule of stator rubber using fluid-structure coupling,and the calculation formula of the deformation that has greater influence on PCP stator seal and leakage in XY direction.According to the deformation amount and the initial interference amount of the stator rubber,the leakage amount of the PCP was obtained,and then the volume efficiency was calculated,and was verified by test.By using this method,the influences of structural parameters such as stator lead,initial interference,eccentricity and working parameters such as single-stage pressure difference,rotational speed and fluid viscosity on volumetric efficiency of the PCP were analyzed.The results show that the volumetric efficiency decreases with the increase of stator lead,and decreases from 47%to 30%at 0.6 MPa pressure difference;It increases with the increase of initial interference,and increases from 31%to 71%under 0.6 MPa pressure difference;it decreases with the increase of single-stage pressure difference,and decreases from 98%to 16%at 0.28 mm of interference;it increases with the increase of rotational speed,and increases from 8%to 69%at 0.178 mm of interference;it increases with the increase of fluid viscosity,and increases from 38%to 85%at 0.178 mm of interference;it changes little with the increase of eccentricity,and decreases from 96%to 94%.

关 键 词：采油螺杆泵 单向流固耦合 数值模拟 容积效率 

分 类 号：TH327[机械工程—机械制造及自动化]