In Figure 4-18 and Figure 4-19, the displacement is a negative value, which means that the spool moves to the left, on the contrary, it moves to the right. Flow field simulation does not consider the spool friction and spring return force.
(1) Displacement of each spool and return oil The main spool steady state hydrodynamic and lateral force analysis The force on the spool. The oil flow in the main valve cavity not only generates axial force (ie steady-state hydrodynamic force), but also has a certain lateral force in the radial direction. The change curves of the steady-state hydrodynamic and lateral force valve opening of the old and new spools are now organized as follows (take 10 discrete points):
The lateral force of the core changes the same with the displacement of the valve core, indicating that the performance of the new valve has not changed; b) The picture shows the steady state liquid in direction B
Power. During the entire displacement process, it can be seen that the steady-state hydrodynamic force of the new valve spool is basically less than that of the old valve.
(2) Displacement of each spool into the oil main spool steady-state hydrodynamic and lateral force analysis
Figure 4-19 shows the steady-state hydrodynamic and lateral forces on the main spool of the spool displacement of the directional valve. Among them, a) is the force in the Y direction. During the entire displacement process, it can be seen that the lateral force of the new valve spool is less than that of the old valve. When the spool is opened to the right, the situation is the opposite. The lateral force of the two spools changes with the displacement of the spool, indicating that the performance of the new valve has not changed; The new valve spool's steady-state hydrodynamic force is less than the old valve, and the spool's steady-state hydrodynamic direction is opposite to the spool's right-open condition when the spool is opened to the left. The steady-state hydrodynamic force is slightly larger than the old valve, and the steady-state hydrodynamic force of the two spools changes with the spool displacement, indicating that the performance of the new valve has not changed.
