Reseaech On Mechanical Properties And Line Style Of Rotor-stator Pair Of Double Helix Progressing Cavity Pump

Progressing cavity pump is widely used in oil field because of its fewer moving parts, even displacement, and more strong adaptability and so on. The double helix progressing cavity pump has characters such as large displacement, high efficiency, low energy consumption and good mechanics characteristic of rotor compared progressing cavity pump and has been gradually promoted in the international community. The application and theoretical research of double helix progressing cavity pump is insufficient in the country. Therefore, the in-depth theoretical study on double helix progressing cavity pump has great realistic meanings and practical significance.The paper begins from the line style theory of progressing cavity pump, according to the conjugate linear equation satisfied the theory of leak-proof and the structural parameters of GLB1200-14, the model of double helix progressing cavity pump of normal hypocycloid is established by SolidWorks. And then, the model has been lead-into ANSYS, selected element, defined material properties, meshed and loaded, the finite element analysis model has been generated. The distribution rule of contact pressure, shearing stress, and equivalent effective stress of double helix progressing cavity pump has been obtained by nonlinear contact finite element calculation.Change the amount of interference, work stress and work pressure respectively, achieved the distribution rule of contact pressure, shearing stress, and equivalent effective stress under various conditions. Taking the comparion of the distribution rule, achieved the impact on the distribution rule of the parameters.Established solid model and finite element model of double helix progressing cavity pump of curtate hypocycloid, carried on the finite element analysis, the results show that, the distribution rule of contact pressure, shearing stress, and equivalent effective stress is the same as double helix progressing cavity pump of normal hypocycloid, and the force status of progressing cavity pump of curtate hypocycloid is better than progressing cavity pump of normal hypocycloid.Using COSMOSMotion software, carried on motion simulation and analysis of double helix progressing cavity pump of normal hypocycloid, achieved the variation of velocity, acceleration and comparatively slide velocity. Taking the analysis of comparatively slide velocity of double helix progressing cavity pump of curtate hypocycloid, the results show that, in the same conditions, double helix progressing cavity pump of curtate hypocycloid is smaller than double helix progressing cavity pump of normal hypocycloid.