Dynamic characteristics and structure optimization of distribution valve for high-speed radial piston pump

YAN Lu1,2, LIAN Zi-sheng1,2, LI Yong-kang1,2
(1.College of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;
2.Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment, Taiyuan 030024, China)

Abstract: Aiming at the problem that matching between the response frequency of the distribution valve and the pump speed in the process of the development of highspeed hydraulic pumps, the flow characteristics of plunger pump system,hysteresis and structure optimization of distribution valve were studied. The spool dynamics model was established based on the valve core force balance equation. Based on the classical control theory, the system time response was analyzed, and then the system transfer function was determined by solving the force balance equation. On the basis of the theoretical analysis, using AMESim software, dynamic flow of highspeed valve distribution system were analyzed and the influence of two different valve core structures and speed of pump on system dynamic characteristics was studied. The results indicate that the system reflow is obvious as the increasing of the pump speed, and meanwhile, the volumetric efficiency of the pump is reduced obviously. In addition, the cone valve is more suitable for highspeed valve distribution system. The damping hole can reduce the force of the valve core on the valve seat and increase the lifespans of the seat.
Key words: high-speed radial piston pump; distribution valve; AMESim; dynamic characteristics