Improvement Design And Reliability Analysis Of High Temperature And High Pressure Pump

With the development of pump technology,high-quality and high-performance special pump research more and more attention,the continuous development of nuclear power energy makes the research of nuclear power pump is particularly important.There are a variety of pumps in the conventional island condensate system of nuclear power plants,as the components of the pump are working in high temperature and high pressure environments,which the operation of the pump safety put forward higher requirements.In this paper,the conventional island condensate pump as the research object,according to the requirements of enterprise,and refer to other similar pump design,high temperature and high pressure pump structure was improved design.First of all,according to the specific parameters such as flow and head,the main parameters of the pump and the shape and shape of the impeller are determined,which provide the theoretical basis for the determination of the overall structure size of the nuclear power pump.Due to high temperature and high pressure environment for the safe operation of nuclear power pump high demand,ordinary rough casting or welding of centrifugal pump performance and quality are low,so the pump body with stainless steel forging molding.The presence of the inlet and outlet flanges of the pump will affect the machinability of the pump body,so the pump body is designed as a revolving body and a non-standard flange is designed.It mainly includes the calculation and analysis of the material selection and the bearing capacity of the outlet flange,the gasket,the bolt and the pump body,and the stress relaxation analysis of the bolt under high temperature and high pressure environment,and designs the overall structure of the flange bolt connection.Then SolidWorks is used to model the high temperature and high pressure pump,which lays the foundation for the calculation and analysis of parts.Secondly,the pump inlet and outlet flange bolts,base bolts and pump shaft and other major structures strength is calculated to ensure that the pump strength requirements.On this basis,the fatigue analysis of the pump shaft is carried out to ensure the service life and reliability.At the same time,the ANSYS software was used to static analyze of the pump body,the shaft and the base,to obtain the total deformation cloud and the stress and strain cloud to check the strength.ANSYS is used to analyze the main structure of the pump,and the natural frequency and vibration pattern are obtained.If the first order natural frequency is larger than the spindle frequency,no resonance occurs,so as to reduce the vibration and noise.Based on the modal analysis of the whole structure,the seismic response of the whole structure under the action of seismic load is obtained,which ensures that the pump can work normally under the specified seismic rating.Finally,the article analyzes the reliability of nuclear fuel pump parts.According to the reason of the failure of the parts,the corresponding measures taken in the design process ofthe high temperature and high pressure pump are analyzed to ensure the safety and reliability of the system.And the reliability prediction of bolts and flanges is carried out.The influence of basic random parameters on the robustness of parts is obtained by using reliability sensitivity analysis,which lays the theoretical foundation for the reliability design of parts.