The Research And Design Of Slotless Tubular Permanent Magnet Linear Reciprocating Pump

Reciprocating pump in our industrial production field plays a comparatively important role.However,the traditional reciprocating linear motion of the pump usually use a rotary motor and intermediate transformation mechanism,which transform the rotation movement into linear motion.Due to the lots of intermediate transformation mechanism between the whole mechanism,the efficiency of the pump is low,the structure size is large,the components are easy to wear,and the life span is short.All these disadvantages are restricted to the development and application of the traditional reciprocating pump.Now with the development of science and technology,the thoughts of "zero transmission" removing the intermediate transformation mechanism between the source of power transmission and working parts are gradually taken into our consideration.For the reciprocating pump,the method of direct drive can easily avoid the transformation of the institutions in the middle by combing the linear motion power source and reciprocating pump.There are many driving modes in the field of direct drive,and linear motor is one of the more common ones.This paper is based on the idea to design a small axial magnet-filled slotless tubular permanent magnet linear motor pump,which is different from the traditional solenoid magnet.In this paper,the structure of the motor is introduced in detail,and a complete theoretical derivation is made for the thrust calculation of the motor.In pump,the structure adopts three check valves for flow control.Two of the bigger check valves are placed in the oil discharge side and absorption side of the pump respectively,and in the hollow of the motor shaft also placed a small check valve,which formed two separated volumes in the ends of motor shaft.When the motor is moving,the function of the whole motor pump is accomplished through the flow control of the check valves.In the fourth chapter,the motor is simulated and analyzed.Through the derivation of the motor thrust,a series of motor parameters ar e determined and the structure of the motor is designed,then the two-dimensional plane model of the motor is established by using the software of ANSYS Maxwell.The material of each region is set,the grid is divided,the excitation source is applied.The magnetic field distribution of the permanent magnet under static solution and the force output characteristic of the motor under transient solver are analyzed.In the fifth chapter,some simulation analysis of the reciprocating pump with AMEsim software is applied.Firstly,the reciprocating pump model with a pair of check valves is established,and the distribution characteristics under the influence of factors,such as spring stiffness and closed dead volume,are analyzed emphatically.Then,the corresponding AMEsim model was established for the reciprocating pump structure with three check valves in distribution in this paper.After setting the corresponding parameters,the simulation obtained the oil outlet side transient flow.It can be seen that the reciprocating pump can complete the oil discharge function,but there is a certain fluctuation in the flow rate.By comparing the analysis of factors such as spool displacement,valve chamber pressure and so on with the valve port transient flow rate,a relatively good pump output flow characteristic was obtained by adjusting certain parameters.