The Thermosetting Coupling Analysis And Parameter Optimization Of The Plastic Lined Pump Structure

There is interaction between the fluid and the impeller in the lining plastic pump when the lining plastic pump in the process of transport medium.The plastic lined pump will produce thermal stress in the process of pumping heat medium.It also can make the lining plastic pump produce thermal deformation and the plastic gap of the pump will changed.While the clearance is too small,it will make the pump casing and impeller of the lining plastic pump produce collision and stuck phenomenon due to the thermal expansion deformation.The abrasion of the impeller will exacerbated.If the clearance is too large,it will produce circumfluence during the pump casing and impeller gap of plastic lined pump and make the efficiency down.At present,the CFD internal flow field analysis,fluid structure coupling analysis and thermo mechanical coupling analysis have not been found in the numerical simulation for the lining plastic pump while most scholars at home and abroad are carried on the numerical simulation and structural analysis.According to the structure design of given parameters,calculated the structure parameters of the lining plastic pump and drawn the three-dimensional models.Import the model into ANSYS Workbench,made the CFD flow analysis to the model;Selected the inlet angleβb1,installation angleβb2,the angle of the packageφ,the inlet diameter D1,and the outlet diameter D2 of the Lining plastic pump impeller as the five factors of orthogonal experiment.Designed and completed the orthogonal experiment,analyzed the orthogonal experiment by using range analysis of orthogonal experiment,then it can be obtained the combined parameters of efficiency and cavitation.In order to get the best combination parameters of the lining plastic pump under the condition of maximum efficiency and minimum cavitation,using the genetic algorithm to optimize the structural parameters.Then carried on the thermosetting,fluid-solid,fluid-thermal-structure interaction for the lining plastic pump.Obtained the displacement deformation and stress distribution of each coupling field under the analysis.Established the orthogonal experimental table of the lining plastic pump impeller.Used the numerical analysis method to analyze the results of the orthogonal experiment.Obtained the influence of each structural parameter on each evaluation index and the best combination parameters.According to the parameter combination of the lining plastic pump impeller optimized by the comprehensive weighted scoring method,the minimum displacement and minimum stress are taken as the reference indexes,then using comprehensive weighted scoring method and Taguchi algorithm to optimize the parameters of pump shirt thermomechanical coupling analysis results.Through the optimization of the parameters of the coupling analysis,the best combination parameters can be obtained when the displacement is minimum and the stress is minimum.Using the 3D printing technology printed the physical model and its performance is verified by experiments.The experimental results show that with the decrease of the flow rate,head increases gradually.Through the coupling analysis of the flow field,the thermal structure field and the solid field,the displacement and stress distribution of the plastic lined pump can be obtained under the condition of multi field coupling is that the displacement distribution increases gradually with the central axis of the impeller structure.The maximum displacement deformation occurs at the edge of the impeller and the displacement of the central axis of the impeller is the smallest.The maximum deformation at the edge of the impeller.Then it can be controlled the clearance between impeller and volute according to the maximum deformation of the impeller.This provided a reference for the design and manufacture of plastic lined pump structure.The maximum stress of impeller is located at the central axis of the impeller.The maximum displacement deformation in the thermosetting coupling conditions of 1.0629mm,the maximum equivalent stress is 9.2606MPa;the maximum deformation of solid flow coupling condition is 0.77391mm,the maximum equivalent stress is 5.8128MPa;the flow of maximum deformation of thermosetting coupling conditions for 1.7717mm,the maximum equivalent stress is 10.31MPa;The parameter optimization of lining plastic pump is carried out by using the method of comprehensive weighted score and Taguchi algorithm,obtained the best combination of structure in thermosetting under coupling parameters.the Parameter combination of Comprehensive weighted scoring method is:A3B1C3D4E2,impeller inlet diameter D1 is 76mm;outlet diameter D2 is 252mm;inlet angle is 26 degrees;the outlet angle is 32 degrees;the wrap angle is 105 degrees;And the Parameter combination of Taguchi algorithm is that A3B1C3D2E2,the impeller inlet diameter D1 is 76mm;outlet diameter D2 is 252mm;inlet angle is 26 degrees;the outlet angle is 24 degrees;the wrap angle is 105 degrees,while the total displacement and stress of lining deformation plastic pump are both minimum.The comparative analysis shows that the combination parameters obtained by the two methods are basically the same.