| The pump is a general-purpose machine.Its products are diversified,small and medium batch production,and almost pumps have work where there is liquid flow.It plays a very important role in the national economy.At present,the domestic centrifugal pump design is mainly based on the traditional two-dimensional hydraulic design and CAD drawing method.This traditional design method relies on the experience of the designer and has a long design cycle,which can't adapt to the current automated manufacturing technology and pump design The parametric 3D modeling method is an important technology for the development of CAD technology and adapting to the requirements of industrial development.It has high efficiency and practical characteristics.In this thesis,a three-dimensional solid model was established,and then the overall flow model was established,and the internal flow numerical simulation analysis and rotor modal analysis were performed.The design feedback was made according to the analysis result,which improves the design efficiency and reduces the development cost.A virtuous cycle from design to analysis.Therefore,from the perspective of shortening the pump product design cycle and improving work efficiency,this research has very important research significance and practical value.The main research work of this thesis is as follows(1)A centrifugal pump housing template was established by manual modeling.The design and establishment of the housing template did not use the method of marking the coordinates of each point on the section,but the dimensional constraint and geometric constraints were used to achieve full constraints or geometry,The main dimension housing thickness in the housing template was used as a variable to drive the operation of the housing parametric modeling module,and finally the three-dimensional parametric design of the housing was realized.In this thesis,the housing thickness was quickly modified by the equation,and the most suitable housing thickness was selected by finite element analysis by ANSYS Workbench.(2)Based on the graphics support software SolidWorks,determine the impeller related parameters and feature division.Under the Windows operating system,through the object-oriented programming tool C#,using the feature modeling method,parametric modeling technology,database and surface processing parameters,a parametric modeling system for centrifugal pump impeller with Windows graphical interface style was developed.The automatic modeling technology of centrifugal pump impeller was realized.(3)The full-flow model of the centrifugal pump was established.The ICEM CFD was used for mesh division.The internal flow model of the centrifugal pump was numerically simulated based on ANSYS CFX.The numerical simulation was used instead of the model test to obtain the flow characteristics and pressure distribution in the pump.The correctness and reliability of the parameterized model were tested and laid the foundation for the prestressed modal analysis of the rotor.(4)The rotor solid model was established by SolidWorks.The fluid-solid coupling function of ANSYS Workbench was used to apply the pressure distribution obtained by numerical simulation of the internal flow of the pump to the corresponding force surface of the rotor model.Calculate the modal analysis of the rotor without prestressing in the air,the modal analysis only by the rotating centrifugal f'orce,the modal analysis only by the fluid-solid coupling force,the modal analysis by the rotating centrifugal force and the fluid-solid coupling force.Compared the natural frequencies and modes of the above four cases,the influence of prestress on the rotor mode was explored,and the stability and reliability of the rotor system were verified. |
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