CFD-based axial steady-state hydrodynamic study and structural optimization of miniature switching valve

Miniature switching valve internal flow pattern is relatively complex, in the working process of the hydraulic valve cavity often produces low-pressure areas, and eddy currents, as well as leads to spool deformation and displacement of the hydrodynamic force and other phenomena. This affects the stability of the internal flow field of the hydraulic valve, especially when the hydraulic pressure is too large to block the spool movement, inaccurate action is present, or even spool opening and closing failure is jitter out of control. Other phenomena, this paper designs a new type of spool and body combination of miniature switching hydraulic valves, to reduce its axial hydraulic pressure. Firstly, a three-dimensional model of the hydraulic valve with different seat angles was established; secondly, CFD numerical analysis of the model was carried out using FLUENT, and the axial steady state hydrodynamic force was studied by comparing the simulation results. The results show that by simultaneously modifying the geometry of the spool and the valve body, the axial component of the hydrodynamic force can be significantly reduced, thus significantly changing the magnitude of the axial hydrodynamic force of the switching valve, to satisfy the requirement of reducing the driving force required for the work, and to achieve the reduction of power consumption. Finally through the hydraulic valve comprehensive test bench to verify the accuracy of the miniature switching valve, through the research of this paper, can provide a certain reference for the design and research of the switching valve.