Research On Key Technology Of Tilting Pad Thrust Bearing With High Temperature And High Specific Pressure For Deep Well Pump

With the growing demand for energy and the depletion of oil and gas resources,underground exploration projects are progressing rapidly.In underground crude oil exploration projects,in some exploration wells,oil and gas resources need to be pumped to the surface through deep wells,with the deepening of underground crude oil prospecting,the bearing used in deep well pump equipment is under more and more severe working conditions,it needs to withstand very large thrust loads,due to the limitation of structural size,the specific pressure of oil film up to 25 MPa,which is much higher than the 2-6 MPa specific pressure of ordinary sliding bearings;At the same time,underground temperatures are high and cooling systems cannot be installed,the working temperature of lubricating oil reaches 250 ?,which is much higher than the 80? of ordinary sliding bearings.It is a great challenge to the design and manufacture of sliding bearing for deep well pump,and now the country basically relies on imports.Therefore,it is a necessary work to study the key technology of the high temperature and large specific pressure tilting-pad thrust bearings.The main work is as follows:Firstly,the hydrodynamic lubrication theory is described,and the formation mechanism of hydrodynamic lubrication is explained.Then,the relevant mathematical model is established,and the boundary conditions are determined.Finally,according to the requirements of working conditions,the structure design of thrust bearing with tilting tile for deep well pump is carried out.Based on the theory of hydrodynamic lubrication,using ANSYS software,through the unidirectional thermo-fluid-solid coupling method,based on the viscosity-temperature effect,the study is carried out on the high temperature and large specific pressure tilting pad thrust bearing,and the bearing pad is studied under different circumferential inclination angles.The bearing capacity of the dynamic pressure lubricating oil film,and the bearing performance and lubrication performance of the bearing under different total axial thrust,different speed,different lubricating oil grades and different oil supply temperatures are studied.It is found that the inclination angle of the bearing bush and the total axial thrust have a great influence on the bearing capacity of the lubricating oil film.The speed,lubricating oil brand and oil supply temperature have a relatively large influence on the lubrication performance.Under extreme conditions,keep the external conditions(such as: thrust plate speed,total axial thrust and lubricant brand,etc.)unchanged.Set the length and width of the small rectangular support block of the bearing bush,the center of the rectangular surface relative to the circumferential offset of the bearing bush,and research under different parameters such as the deviation of the center of the rectangular surface relative to the radial center of the bearing bush.It was found that these four parameters all have influence on the deformation of the bearing bush,the structural size that minimizes the deformation of the bearing bush was determined.Finally,based on the previous theoretical analysis,a high temperature and large specific pressure tilting-pad thrust bearing test bench was built.The test bench can simultaneously provide a maximum oil supply temperature of 300 ° C and a bearing working environment with a maximum pressure of 200 KN,it can carry out performance tests under all working conditions.The maximum pressure and maximum temperature of the lubricating oil film under various working conditions are obtained from the test,and they are compared with theoretical calculations to verify their correctness.