Analysis And Optimization Of Mechanical Behavior Of Gear And Rack Transmission Mechanism Of Downhole Pump

In order to improve oil extraction efficiency and ameliorate rod and tube wear,rodless pump oil extraction has become an important direction for the development of artificial lift technology.This article designs and analyzes the entire transmission mechanism based on the transmission scheme conception of the gear rack transmission mechanism of the downhole pumping pump.In this paper,the model of the entire downhole pump gear and rack mechanism is designed and a three-dimensional model of the entire transmission system is established.Through kinematics simulation,the output speed of each component and the output speed and displacement of the rack were obtained,which verified the rationality of the entire transmission mechanism.Using Hypermesh and Ansys co-simulation,the strength and fatigue characteristics of the NW planetary gear reducer are analyzed,and the maximum equivalent stress of the entire gear train is 440 MPa,and the maximum service life is 3.08 years,which not only meets the requirements of strength but also the requirements of design life.The strength and contact characteristics of the NGW type double arc planetary gear reducer are analyzed,and the maximum equivalent stress of the entire gear train in the simulation process is 941 MPa,and the maximum stress is located at the contact end face of the sun gear and the planetary gear.The contact state of the entire gear train is basically consistent with the theoretical calculation value.Of the downhole pump rack and gear mechanism key member gear and rack mechanism has been optimized by using genetic algorithms and nonlinear programming and response surface methodology MOGA algorithm combines two ways.In this process,with the smallest radial size of the gear and rack as the objective function,the mathematical model of the gear and rack is solved and analyzed,and the radial size of the gear and rack is reduced by 6.6%.In order to make the entire transmission system adapt to a variety of well conditions,the frequency conversion control strategy of the submersible motor used is studied.Through the voltage space vector inverter and the reference model adaptive method,the speed sensorless direct torque control of the submersible motor is realized.It is obtained through simulation that changing the input frequency of the model can change the output speed of the motor,thereby changing the stroke frequency of the reciprocating pump,and the entire Simulink simulation model has a faster response and better performance.