Research On Dynamic Characteristic Of A New Radial Piston Pump With Axial Flow Distribution

A new radial piston pump developed by our school has been widely recognized by users with its high working pressure, impact resistance, long life and control of high precision. However, the past experience shows that even the hydraulic system has very good static characteristics, but there will be many problems when it runs, such as vibration, noise and so on. These problems are mainly caused by dynamics of the system. As the core component of hydraulic system, the hydraulic pump has the biggest influence.In this paper, we accomplish the dynamic characteristic's research of new radial piston pump through the method of flowing simulation. We will have a better understanding when we have finished the research. Some conclusions provide theoretical foundation for the designing of hydraulic pump. We use 40mL/r radial piston pump for the study, and the main research contents are shown below:(1)Describing the working principle of radial piston pump and analyzing the movement of distribution pairs. We deduce the equation of plunger's motion process.(2)Because of the high pressure fluid can not be seen as an incompressible fluid, we present the concept of weakly compressive fluid in the paper, and we deduce the equation.(3)Considering the viscosity's effects and deducing the expression of viscosity.(4)According to the Reynolds number, we determine respectively the fluid state of suction chamber, discharge chamber, plunger chamber, and distribution pairs and so on.(5)We build the physical model of radial piston pump in the pro/E, and then we use Fluent to solve the movement's process. Because of the fluid state can not be seen as a general fluid state, we use the model of laminar flow and local turbulence when we solve the fluid.(6)We study the characteristics of the double triangular grooves in the paper, and we compare it with the single triangular groove.(7)In view of other pump's damping structure, we design a new damping structure in this pump and analyze it.Through the research content, we can conclude that:â‘ In the pre-boost area, the semi-circular groove can get better result than triangular groove. The actual pulse rate of the pump's outlet drops to 17% from 22.1%.â‘¡The dynamic characteristics of double triangular grooves are better than the single triangular groove.â‘¢In the pre-boost area, the flow coefficient of damping groove is a fixed value(0.7).â‘£Spindle speed, pressure and eccentricity impact on the pump's dynamic characteristics are different. The load pressure's influence is the biggest among all the parameters, and the next parameter is the spindle speed. The eccentricity has the smallest impact...