Hydraulically Driven Reciprocating Pump Commutation Impact Study And Closed System Design

Hydraulic reciprocating pump is essential among industrial pumps. As the world is short of energy, hydraulic reciprocating pump is being used more and more widely in all fields for its high efficiency and energy-saving. Compared to the traditional mechanical transmission reciprocating pump and the electrical transmission reciprocating pump hydraulic reciprocating pump has been an important direction for research and development abroad. It has many advantages, such as high efficiency, being widely used, high pressure, convenience in made and repair and so on. Currently,our research for hyduraulic reciprocating pump is still at initial stage. There are many technical problems to solve in existing hydraulic reciprocating systems. So, the research for hydraulic system of hydraulic reciprocating pump has very important and practical significances.In this paper, the author has made the following studies:1. reviews of the basic theories of hydraulic reciprocating pump. Based on the existing research results, the paper summarized the type,composition, and working principle of the hydraulic reciprocating pump. It also illustrated the flow characteristics,pressure characteristics and piston movement characteristics of the hydraulic reciprocating pump system.2. the research of the reversing impact of open hydraulic reciprocating pump system. Since the open hydraulic reciprocating pump system uses the valve control reversing, it has big reversing impact. In the paper,the author analysised and researched the working principle and characteristics of pumping loops, and found out the root causes of reversing impact and forward three solutions:parallel an accumulator to the high pressure side; choose appropriate transition function of reversing valves; extend the reversing time of reversing valves. Theoretical calculation, mathematical model and simulation analysis of the three solutions were also done for offering references to reduce the reversing impact of open hydraulic reciprocating pump system. 3. The research for the instantaneous air suction in the low pressure suction side of the closed hydraulic reciprocating pump system. The paper illustrated the mechanism of this phenomenon and proposed a solution of paralleling an accumulator to the low pressure side. Based on this solution, the paper also designed a new closed hydraulic reciprocating pump system. According to the principle of the system, the paper established corresponding simulation model by using the power linkage chart law and Matlab software's Simulink toolbox. By entering the simulation parameters, the paper compared the dynamic simulink results of original system to the changed system and made analysis.4. Build the closed hydraulic reciprocating pump experimental platform. The paper analysised the experiment results of the new and old system's pressure-changing on the high and low pressure side on the prototype of closed hydraulic reciprocating pump system, which futherly prove the correctness and feasibility of the theory of the new closed hydraulic reciprocating pump system.