Abstract:  On the issue of the sticking phenomenon caused by the radical deformation of the valve core due to the high volume of internal flow, high pressure, complex flow structure and significant rise of the throttling temperature in a multi-way valve, a numerical simulation study of fluid-solid-thermal coupling was carried out. First, the AMESim and UG software were used to model the load-sensitive multi-way valve. Then, the ICEM was used to mesh the fluid domain and solid domain. Finally, the ANSYS workbench platform was used to perform fluidsolidheat coupling numerical simulations for different working conditions. The fluid velocity, pressure distribution, throttle temperature rise, cavitation and spool deformation in the flow field under different working conditions were analyzed. The results show that the temperature in the area where the valve core in contact with the oil is greatly affected, while the temperature in the area far away from the oil does not change significantly. Under the influence of the oil temperature, the expansion deformation occurs in the throttle groove area on the valve core. With the large opening of the main valve and the low opening of the pressure compensator, void space occurred and caused cavitation; while the throttling temperature rises significantly at the throttle groove, and the valve core has a large deformation, thus resulting in the sticking phenomenon. This research conclusion can provide theoretical support for the structural design of the multiway valve core.

Key words:  multi-way valve; fluid-solid-thermal coupling; throttling temperature; cavitation; valve core deformation

WANG Ting-dong, YANG Jing. Simulation of load-sensitive hydraulic multi-way valve based on fluid-solid-heat coupling［J］.Journal of Mechanical & Electrical Engineering, 2022,39(1):1-9.