Parametric Modeling And Finite Element Analysis Of Three-Head Progressing Cavity Pump Based On Linetype Optimization

The Progressing Cavity Pump(PCP) not only has smooth transmission, low noise, reliable and simple structure, but also can transmit high viscosity and sensitivity of the medium. Therefore, PCP has been widely used in various fields. Currently, the study mainly focused on single-head PCP and double-head PCP,and the analysis and research on the other multiple-head PCP is less, and multiple-head PCP has high efficiency, long life, high flow and so on. So we choose three-head PCP as the research object for analysis and research, which has a certain reference value for the depth analysis and research on other multiple-head PCP.1. The linetype theory of PCP is comprehensively and systematically analyzed, and the envelope method and the tooth profile normal method is used to analyze conjugated linetype to establish the corresponding linetype equation. In order to eliminate the phenomenon of equidistant curves of deduction, the curvature radius of equidistant curve of different cycloid is studied. When the variation coefficient of the curtate hypocycloid is close to 1, the range of curvature radius which does not appear deduction is wide. So the curtate hypocycloid is often selected as the linetype of PCP.2. Through the analysis of the parameters of the curtate hypocycloid equidistance linetype, the basic parameters includes the stator diameter, the number of rotor heads, the variation coefficient and the coefficient of equidistant radius. From the analysis and study of the displacement and life, the flow area, the maximum sliding speed, eccentricity and the largest integrated curvature are selected as evaluations of the PCP equidistant linetype, and use the method of combining ISIGHT with MATLAB to implement the multi-objective optimizations which include the maximum of flow area, the minimum of the maximum sliding speed, the minimum of eccentricity and the minimum of the largest integrated curvature. The result is showed that the three-head PCP optimized in terms of overall performance is better than the three-head PCP which is not optimized.3. Through the use of CATIA knowledge engineering and expert system modules for parametric modeling of PCP, the 3D models of stator and rotor are completed by CATIA secondary development platform which is established by VB technology. And static and dynamic interference detections are carried out to prove the correctness of 3D model of the three-head PCP.4. Finite element analysis of the three-head PCP which include before and after optimization is established to analyze the stress and strain distribution. The comprehensive analysis result is showed that the three-head PCP optimized in terms of performance is improved, and the correctness of the design optimization is verified.