Effect of Magnus Force on Ball Behavior in Hydraulic L Shaped Pipe

摘要

This paper presents a control method of a check ball in hydraulic L-shaped pipe by Magnus force. The spring-driven ball-type check valve is one of the most important components of hydraulic systems; it controls the position of the ball and prevents backward flow. In this paper, the relationship between the position of the inlet pipe and the ball levitation time is evaluated using CAE. The check ball is arranged as a check valve in the L shape piping of the hydraulic cylinder. By moving the position of the inflow pipe from the center of the housing, a strong swirling flow is generated in the entire housing to give rotational motion to the check ball. Magnus force was exerted by this rotation and it was found that the levitation time was advanced. The check ball is supported by a spring to ensure the check operation. However, the spring must be eliminated due to various problems. This causes the check ball to rotate and translate. In the experiment, it is difficult to confirm the behavior of the check ball and the detailed flow around it. The purpose of this study is to clarify the effect of the Magnus force acting on the rotation of the check ball by using CAE tool. It was found that there is a difference in the time to check depending on the rotation direction and rotation speed of the check ball.