Study On The Dynamic Characteristics Of The Double Cylinder Linear Motor Reciprocating Pump

Reciprocating pump with discharge pressure and high efficiency, is one of the most common type of pump. Reciprocating pump technology has been widely applied nowadays, many pump products of different structures and different types have been produced, including crank linkage reciprocating pump, cam reciprocating pump and hydraulic reciprocating pump. Based on the investigation, we found that there some shortcomings of the traditional reciprocating pump, such as complicated structure, low in the overall efficiency, much middle transmission links, large fluctuations in the flow and pressure, inconvenience maintenance, and also difficult to achieve large displacement, low stroke rates and long stroke. Linear motor is a device which can convert electrical energy into mechanical energy of linear motion directly. With the progress of science and technology, it has been widely used for its simple structure, high speed and accuracy, low noise and cost. Using the linear motor to drive the reciprocating pump which can save the middle transmission links, simplify the structure of the pump and increase the working reliability and system efficiency; the flow of the pump can be regulated by changing the movement of the piston; it’s also easily to achieve automatic control.The scheme of linear oscillatory motor with two divided moving body driven double-cylinder reciprocating pump has been proposed in the thesis. This thesis studied the dynamic characteristics of the Double-cylinder Linear Motor Reciprocating Pump (DLMRP). The main research work is as follows:1. Consulting a large number domestic and foreign literatures, the development and application status of reciprocating pump and linear motor were summarized, and the research status of linear motor reciprocating pump was introduced briefly.2. Outlined the basic structure and working principle of the linear motor, according to the structure and working principle of the linear oscillatory motor with two divided moving body, analyzed the characteristics of the motor and the choice of permanent magnet material;3.Analyzed the circuit and magnetic circuit of the linear oscillatory motor with two divided moving body and established its mathematical model using the equivalent magnetic circuit method, analyzed the vibration characteristics of the motor, derived the calculations of the motor shaft power and efficiency;4. The movement rules of the piston and valve were studied based on the structure and theoretical analysis of the DLMRP.5. On the basis of theoretical research, electromagnetic systems, water systems and power system model of the DLMRP were established, made the numerical solution using the method of fourth-order Runge-Kutta with Matlab, and the result showed that the pump is energy-efficient;6. The AMEsim engineering simulation software was used to model and simulation of the pump system, Described the effect of the electromagnetic force frequency on the pump function. Observed and studied the flow rate and pressure characteristics of the system. The result proves the feasibility of the DLMRP and provides a theoretical basis for design and optimization of this kind of pump.