The Calculation And Analysis Of Temperature Field Andstress Field In Large Pump Shielded Motor Stator Cavity

Large-scale nuclear pump shield motor used in nuclear power plant reactor cooling system,used to drive the reactor cooling pump to cool the core,the motor high temperature,under pressure,poor operating environment.The stator cavity of the motor adopts the welding structure of the casing and the shielding sleeve to form a stator sealed chamber,which has poor heat dissipation capability,and the stator winding is prone to local temperature rise and damage;the casing part is the nuclear safety pressure boundary,and once damaged,nuclei will be generated Leakage;pressure shield sleeve thickness thin prone to damage,the motor will lose the loss of normal drive function,causing the reactor emergency shutdown;In addition to maintaining the stator cavity sealing difficulties.Therefore,the stator cavity shell,shielding sleeve and its supporting components of the temperature field and stress field must be accurately analyzed to eliminate design problems and improve the safety of motor operation.According to the characteristics of the high temperature environment,the temperature field of the stator cavity of the shielded pump motor is modeled.The temperature distribution of the stator cavity is studied by the analytical method and the finite element method,and the high temperature rise position of the stator cavity is identified.The cause of the temperature rise in the high temperature rise area is analyzed,and the main reason for the local high temperature area is obtained and verified.On the basis of the high temperature zone analysis,the structure and the installation form of the shielding sleeve of the shielding sleeve of the stator cavity are compared and analyzed.The temperature rise level of the local high temperature zone in the end circulation is reduced,the heat transfer structure and the heat dissipation capacity of the stator cavity of the shielded motor are optimized.The stress field of the stator cavity of the shielded pump motor is modeled in this paper.The stress distribution of the stator chamber under two conditions of normal pressure and internal abnormal rupture is analyzed with the aid of the finite element tool,and the criterion for determining the lattice of the stator cavity is given.The deformation and displacement of the key components of thermal stress,radial fatigue and pressure are calculated and analyzed.The measures to avoid the damage of the shielding sleeve are given by optimizing the structure,which provides a basis for ensuring the reliable operation of the motor.According to the calculation results,the structure and test parameters of the simplified simulation test parts of the shielding casing and the support structure are determined,which provides the basis for the simulation test and verification of the key components of the motor.Based on the analysis results of the stress temperature field and the optimal design results,the key component design and simulation test are carried out.The stator prototype is designed and the stator prototype is manufactured.The hydraulic pressure test,the pressure test test and the helium leakage airtightness test are carried out on the stator cavity of the prototype.The experimental results meet the design requirements and are verified.The accuracy and rationality of the results of temperature and stress fields in stator cavity are analyzed.