Design And Research Of New Type Submersible Screw Pump Reducer

The submersible screw pump installed in the well is a new way of oil production instead of the traditional rod pumping system.In this system,the well fluid is lifted to the surface after being pressurized by the rotor of the progressing cavity pump driven by the motor through the reducer.In view of the narrow radial dimension of the downhole space and the difficulty in realizing the traditional meshing transmission mode,based on the concept of linkage CAM transmission put forward independently,a new transmission mode with slender structure--cylindrical CAM reducer was designed by using the principle of cylindrical CAM mechanism.On the basis of the structural design,the related theoretical problems are studied.On the basis of brief introduction of the concept of CAM mechanism,the concept of linkage CAM drive is put forward,that is,CAM mechanism and anti-cam mechanism share a set of intermediate drive parts(namely CAM follower).This paper introduces the basic structure of the linkage CAM drive,and explains the characteristics of the drive by analyzing the relationship between the meshing of the linkage CAM drive and the steering and rotating speed of the main and driven cams.The diversity of the transmission is analyzed.Based on the concept of linkage CAM drive,the concept of linkage CAM drive is further developed to solve the problem that a single linkage CAM drive can not achieve a whole week of continuous rotation.A variety of linkage CAM drive methods are listed.Through the evolution of structure or parameters,the concept of combined linkage CAM drive is further expanded.The results show that,as a basic form of indirect meshing drive,the combined linkage CAM drive not only has its own structural diversity,but also can evolve into direct meshing drives such as movable tooth drive,harmonic drive,chain drive and involute gear drive.Therefore,it is of positive significance to promote the discovery of new transmission forms.In view of the needs of cylindrical CAM reducer in this paper,the contours of the main CAM and the driven CAM are discussed.In order to obtain a larger contact area between the CAM and the intermediate transmission parts so as to have a larger bearing capacity,the uniform motion law on the main body of the CAM curve is selected.In order to avoid the rigid impact at the beginning and end of the uniform motion law,the problem of using different curve forms to correct the uniform motion law is discussed in detail.Includes polynomials,trigonometric corrections,and combinatorial corrections.At the same time,the change of motion Angle ratio and travel ratio of the corrected section curve is discussed,and the results of different correction strategies are compared and analyzed.For the correction of the law of uniform motion,the relevant conclusion is that,first of all,the first and second polynomial functions are not suitable for the correction of uniform motion.Second,the cubic polynomial function correction can avoid rigid impact,but there is still flexible impact.Thirdly,the correction of the fourth and fifth degree polynomial function and the higher degree polynomial function can obtain the correction segment without impact better.Finally,the motion law of trigonometric functions can only be modified if certain conditions are satisfied.Prototype processing and experiment were carried out on the design results.The results show that the designed scheme performs well with no load and light load,and the transmission noise is very low,but there are still some problems.For example,due to the need to use a hard tooth surface,cylindrical convex profile is difficult to manufacture and processing,and wear is serious in the experiment,so the transmission capacity needs to be further studied.