外摆线型单螺杆泵运动仿真及结构参数优化

发布时间：2018-10-14 09:57

【摘要】：螺杆泵采油系统以其结构简单、管理方便、适应性强等特点日益受到国内外油田的重视。随着三次采油技术的发展,螺杆泵采油系统已成为油田中最重要的人工举升方式之一。目前油田中普遍使用内摆线型单螺杆泵,这种螺杆泵螺杆一般为金属材料,衬套一般为橡胶材料,由于衬套是易损件,检泵更换衬套时需要将油管和抽油杆同时取出,检泵时间长,检泵费用高,与“高水平,高效益”的长远方针极其不符。外摆线线型从理论上也可用于螺杆泵的设计,但关于此方面的研究却甚少。本文从外摆线型骨线共轭副的形成入手,通过分析外摆线型单螺杆泵螺杆-衬套副的相对运动,发现外摆线型单螺杆泵的固定接触点出现在衬套骨线上,从而提出衬套采用金属材料,螺杆表面采用橡胶材料;用速度瞬心法推导出齿凸接触点和齿凹接触点处相对滑动速度的计算公式,并用MATLAB生成了速度曲线;对Solid Works进行二次开发,实现了外摆线型单螺杆泵的参数化建模,用Solid Works Motion对外摆线型单螺杆泵进行了运动仿真,并提取出了齿凸接触点和齿凹接触点处相对滑动速度的离散值,与MATLAB输出的公式曲线进行对比,拟合度很高,最大偏差率仅为0.14203%;将速度曲线与啮合状态进行对应,发现齿凹接触点处相对滑动速度的最大值发生在螺杆齿凸中点与衬套齿凹中点相接触处,齿凸接触点处相对滑动速度最大值发生在螺杆齿凸中点与衬套齿凸中点相接触处。将过流面积、幅长系数、最大综合曲率和相对滑动速度作为影响外摆线型单螺杆泵性能的指标,通过线性加权组合法构建优化的目标函数,用阀值法对各个子目标进行无量纲化处理,用MATLAB优化工具箱中的fmincon函数进行优化计算,全局最优解为幅长系数K=0.757,等距半径系数r0=1.4。
[Abstract]:The screw pump oil recovery system has been paid more and more attention by oil fields at home and abroad for its simple structure, convenient management and strong adaptability. With the development of tertiary oil recovery technology, screw pump oil recovery system has become one of the most important artificial lifting methods in oil fields. At present, the inner cycloid type single screw pump is widely used in oil fields. The screw of this kind of screw pump is usually metal material, and the bushing is generally rubber material. Since the bushing is a wearable part, it is necessary to remove the tubing and sucker rod simultaneously when the pump is replacing the bushing. The pump inspection time is long, the pump inspection cost is high, and the long-term policy of "high level, high efficiency" is extremely inconsistent. The cycloid type can also be used in the design of screw pump theoretically, but there is little research on this aspect. Starting from the formation of the conjugate pair of the outer cycloid type bone line, by analyzing the relative motion of the screw bushing pair of the cycloid type single screw pump, it is found that the fixed contact point of the outer cycloid type single screw pump appears on the bushing bone line. The formula of relative sliding velocity between tooth convex contact point and tooth concave contact point is derived by velocity instantaneous center method, and the velocity curve is generated by MATLAB, the metal material is used for bushing and rubber material is used on screw surface, and the relative sliding velocity between tooth convex contact point and tooth concave contact point is derived by velocity instantaneous center method. The parametric modeling of cycloidal single screw pump is realized by the secondary development of Solid Works. The kinematic simulation of the external cycloidal single screw pump with Solid Works Motion is carried out, and the discrete value of the relative sliding velocity between the contact point of tooth convex and the contact point of tooth concave is extracted. Comparing with the formula curve of MATLAB output, the fitting degree is very high, the maximum deviation rate is only 0.14203, the velocity curve is corresponding to the meshing state, It is found that the maximum relative slip velocity at the contact point of tooth concave occurs at the contact point between the middle point of the screw tooth convex and the middle point of the bushing tooth concave, and the maximum value of the relative slip velocity at the contact point of the tooth convex point occurs at the contact point between the middle point of the screw tooth convex and the middle point of the bushing tooth convex. The overcurrent area, amplitude and length coefficient, maximum synthetic curvature and relative sliding velocity are taken as the indexes to influence the performance of cycloidal single-screw pump. The optimized objective function is constructed by linear weighted combination method. The threshold method is used for dimensionless processing of each subtarget, and the fmincon function in MATLAB optimization toolbox is used to optimize the solution. The global optimal solution is amplitude and length coefficient K _ (0.757) and isometric radius coefficient r _ 0 ~ (1. 4).
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TE933.3

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