| With the continuous increase of oil field mining output,the displacement of submersible screw pump(ESPCP)system has become the primary problem in the development of oil production operations,which requires the study of the coupling of submersible screw pump.The displacement of screw pump is related to the eccentricity of its screw.The screw is connected to the coupling,and the coupling drives the screw to move together.Therefore,the structure of the coupling affects the displacement of the submersible screw pump(ESPCP)system.The zero tooth difference internal gear coupling in the submersible screw pump production system is an important transmission component of the system,which carries torque,axial force and changes the form of motion.Therefore,the design and research of the coupling is very important.The ESPCP system specific gear pair refers to a zero tooth difference internal meshing gear pair,which is a new type of device specifically designed for the coupling part of the ESPCP system.This article analyzes the relationship between the maximum center distance that the internal and external gears can achieve after modification and the various modification coefficients of a zero tooth difference internal meshing gear pair.Based on constraints such as strength and over cutting,the initial domain for selecting modification coefficients is given,and a modification coefficient selection model is constructed to ensure the simplicity and accuracy of the selection of modification coefficients.And explained the theory of the meshing process of zero tooth difference gear pairs,defined the starting and ending points of meshing,and deduced the calculation formula for the coordinates of the starting and ending points.At the same time,based on the specific needs of production,a method for selecting the modification coefficient of zero tooth difference internal meshing gear pairs and a study on the strength of special modified gears have been carried out to grasp the balance between "maintaining strength" and "increasing displacement".Then,by providing a new method for selecting the modification coefficient,it can quickly and accurately calculate the modification coefficient that meets the requirements according to the constraint preconditions such as the meshing equation after defining the Effective domain of the initial value of the modification coefficient.This method can effectively solve the problem of selecting the modification coefficient of the meshing gear pair within the involute zero tooth difference of the gear coupling in the oil production control system of submersible screw pump(ESPCP),Make the selection of technical parameters more concise,direct and accurate.Finally,the Solid Works software system is used to parameterize the modeling of zero tooth difference gear pairs and complete meshing motion simulation,in order to observe the gear meshing situation more directly and dynamically.By importing the model into Ansys finite element software and analyzing the contact stress of internal meshing gears,the corresponding stress distribution map can be obtained,and the contact stress of tooth surfaces with different modification coefficients can be analyzed.After finite element static analysis,we believe that gears are prone to faults at the meshing point.So,when optimizing gear design,we must pay special attention to the dangerous situations at the contact between the tooth root and the tooth surface. |
