Submersible Screw Pump Mechanical Properties Of Finite Element Analysis

With its unique advantages, the progressing cavity pump has been widely applied inoil field. It has become the studying focus on Enhancing its lifting performance andextending service life both home and abroad. At present there isn’t effective method to testthe loading and distortion of the PCP under actual operating mode. So it is useful attemptto use computer technology for virtual finite element modeling and numerical analysisRotor and stator is the main working parts of screw pump. This paper expounds thebasic principle of screw pump, the type of screw pump rotor, stator line equation and themathematical expression of contact seal line, explain the formation mechanism of thesealed cavity, and then from the Angle of the kinematics analysis to the movement of thesealed cavity and the rotor motion in the stator bushing.Because of the complex profile of the PCP rotor and stator, the three-dimensionalmodel is usually replaced by a real model. There is a big error in the analysis results. Thisarticle establishes three-dimensional parametric model of the PCP using NX, and inductsthe model to the ANSYS software to carry on finite element grid dividing through thesoftware connection technology of ANSYS and NX. Using ANSYS finite element analysissoftware, the simulation of the screw pump working status, work in uniform internalpressure and the differential effect of two kinds of cases, the three models analyzed themechanical characteristics of screw pump, screw pump stator is obtained of thedisplacement, stress and shear stress distribution rule.By means of single screw pump stator of three different models of displacement,equivalent stress and shear stress distribution of cloud analysis, we find that using theplane model instead of3d model can simplify the analysis process and reduce the analysisdifficult, but it can’t guarantee the analysis accuracy and is inappropriate. We suggest thatthe analysis results of3d model is more close to the real situation, and support thenecessity of application of three-dimensional model for finite element analysis. Theresearch of this paper lays the foundation of improving the performance of screw pump.