Simulation of Stator and Rotor Meshing Rotation of Double Helix Single Screw Pump
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摘要: 为了提高双头单螺杆泵的工作效率和使用寿命，研究了结构参数对其工作效率及使用寿命的影响。基于橡胶Mooney-Rivlin双参数模型理论，考虑橡胶衬套材料具有非线性变形特性、内压及转子惯性对橡胶衬套的作用，建立了双头单螺杆泵一个导程的定转子三维啮合模型，分析了过盈量、偏心距对螺杆泵定子衬套应力和摩擦阻力矩的影响。数值模拟结果显示，偏心距选择7.5 mm时，过盈量由0.2 mm增加到0.6 mm，螺杆泵摩擦阻力矩从88.52 N·m增大到466.51 N·m，衬套应力峰值由1.4 MPa增加到1.8 MPa；而过盈量取0.4 mm时，偏心距由7.3 mm增大到7.5 mm，摩擦阻力矩从240.00 N·m仅增加到264.77 N·m，衬套应力峰值由1.28 MPa增加到1.62 MPa。这表明，合理搭配过盈量和偏心距可以提高螺杆泵的工作效率和使用寿命，为螺杆泵设计及结构参数优化提供了理论依据。Abstract: In order to improve working efficiency and service time of double helix single screw pump,the effects of its structure parameters on working efficiency and service time were studied.Based on double parameter Mooney-Rivlin model,a three-dimensional meshing model taking material nonlinearity,internal pressure and inertia effect of the rotor on the rubber lining into account,was established for the double helix single screw pump.The effects of interference fit and eccentricity change on the stator rubber lining’s stress and fatigue failure were acquired from the analysis.Simulation results showed that frictional torque increased from 88.52 N·m to 466.51 N·m and stator lining stress increased from 1.4 MPa to 1.8 MPa,when interference fit increased from 0.2 mm to 0.6 mm under eccentricity 7.5 mm.Frictional torque increased only from 240.00 N·m to 264.77 N·m,when eccentricity increased from 7.3 mm to 7.5 mm under interference fit 0.4 mm,however,the peak stress on stator lining increased from 1.28 MPa to 1.62 MPa.This showed that the rational combination of interference fit and eccentricity could increase work efficiency and service time of the screw pump.The work in this paper established a theory foundation for the design and structure parameter optimization of the double helix single screw pump.
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Keywords:
- screw pump /
- stator /
- rubber /
- lining /
- rotor /
- geometrical model /
- mathematic model
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