The Law of Valve Movement of Fountain Pump

In the experiment, it was found that the movement law of the valve of the fountain pump was not exactly the same as that of the people, and its movement was accompanied by two kinds of rotary motion in addition to the linear motion in the vertical direction. When the plunger movement speed is small, the valve ball around the vertical axis of the horizontal rotation and along the hole in the seat hole that is the valve seat hole axis revolution. The angular velocity of the plunger is related to the velocity of the plunger. The greater the speed of the plunger, the greater the angular velocity of the ball. The special form of the ball is mainly related to the particularity of the valve ball, the seat structure and the impact of the fluid. Deep well pump is a spherical valve, when the fluid around it flows, in the back of the surface layer will be off the phenomenon, while generating a lateral excitation force. Due to the symmetry of the ball, this lateral force will move along the circumference of the "equator" around the ball, so that the ball is not always on the axis of the valve seat, but away from a distance and close to the seat Corner on the rotation, which is the "revolution" phenomenon.
In addition, due to the instability of the fluid flow and the deviation of the ball caused by the fluid relative to the valve ball flow asymmetry, the ball will produce a certain degree of deflection, so that the lateral force is not acting on the core, but in the horizontal There is a certain eccentric, so that the ball in the horizontal plane there is a rotation, that is, "rotation" phenomenon. The above conclusion is obtained in the case of pure liquid. In the gas-liquid mixed-phase flow, due to the existence of bubbles, the flow field disturbance is more intense, and the bubble on the ball has a certain impact, this time the ball movement is more complex, in addition to rotating movement, there are drifting up and down.