Research On Mechanical Properties Of Rod-bushing Vice Of The Single Progressive Cavity Pump

With its unique advantages, the progressing cavity pump has been extensively applied in oil field. Further enhancing its lifting performance and extending service life have become the studying focus both home and abroad. But there isn't effective method to test the loading and distortion of the PCP under actual operating mode at present .So using computer technology for virtual finite element modeling and numerical analysis is useful attempt.Because the profile of the PCP rotor and stator is complex, there is certain difficulty for modeling and finite element analysis. In the articles carring on finite element analysis to the screw pump, the three-dimensional model is usually replaced by areal model , therefore there is big error in the analysis results. So this article establishes three-dimensional parametric model of the PCP using SolidWorks, and inducts the model to the ANSYS software to carry on finite element grid dividing through the software connection technology of ANSYS and SolidWorks. Then we carry contacting analysis to the rotor and stator under coupling stressful condition. We get the changing rules of the PCP stator rubber parameters, such as displacement, stress, strain and so on, along with the rotor position, surplus, fluid pressure, rubber material and so on under even working pressure. The result shows that the equivalent stress of the screw pump stator is smaller than its own yield stress when the stator and rotor fit under working pressure,so it will not yield. When the rotor is located in the top circular arc of the stator, the displacement, stress and strain of the stator is bigger than those when the rotor is located in the linear position, and the maximum value appears 45 degrees against the contacting circular arc, so this position wears most seriously; By contrast of the shear stress, shear strain respectively, we can see that the xz shear stress and xz shear strain are bigger than those of xy and yz, so the xz shear failure is the main factor undermining screw pump. The stress, strain and contacting pressure of the stator grow with the increase of the working pressure and surplus, furthermore decrease with the increase of the poisson ratio, especially the xz shear stress, shear strain change more sensitive if working pressure is greater than 1.4 MPa or poisson ratio greater than 0.495.The results of this article provide reliable theoretical basis to study on the screw pump failure reasons and optimize the structural and operating parameters of the screw pump.