Experimental and numerical study on valve dynamic impact contact characteristics and fault diagnosis of a reciprocating piston pump.

Abstract

With the increase in power and flow of emulsion pumps, pump valves are more likely to be damaged during long working hours, Therefore, it is important to ensure the reliability of pump valves at all stages. However, there are still some problems that need to be solved urgently. For example, whether the actual dynamic characteristics of the valve are consistent with the simulation results, and whether the simulation can replace experiments to provide a reference for the design improvement of the valve. At the same time, what is the failure mechanism of the valve, and what methods can be used to find the early failure of the valve. Therefore, the dynamic impact contact characteristics and fault diagnosis of valves of reciprocating piston pumps were investigated both experimentally and numerically. They were analyzed using AMESim simulation and U-Adolph theory, respectively, to predict the dynamic characteristics of the valve. The effect of spring stiffness on the dynamic characteristics of the valve was also investigated. The numerical analysis and analytical results are in good agreement with the experimental results, which provide an important reference for the development of new horizontal five-cylinder single-acting reciprocating pumps. In addition, finite element analysis was used to study the impact contact characteristics of the discharge valve closing under different valve diameters. The failure mechanism of the pump and valve was revealed, a fault diagnosis method was proposed, and the effectiveness of the method is verified by experiment.