Simulation Analysis of Temperature Rise and Thermal Deformation of Multi-way Valve Spool in Sugarcane Harvester
Multi-way valve is the core component of the hydraulic system of sugarcane harvesting machinery,which is used to control the cooperative operation of multiple working devices.Aiming at the problems of large pressure difference variation at the valve port,obvious throttling temperature rise,and easy to cause spool deformation and stagnation,a fluid-solid-thermal coupling simulation study was carried out on the spool of the multi-way valve.Firstly,Design Model software is used to extract the corresponding flow paths and establish the simulation model of the flow field of multi-way valves with different openings,and then imported into ANSYS Workbench platform to carry out the fluid-solid-thermal coupling simulation under different working conditions.Finally,it analyzed and compared the fluid velocity,spool temperature and deformation of the internal flow field of the multi-way valve with double U-shaped and triangular throttling grooves under different openings and different inlet and outlet differential pressure conditions.The results of the study showed that the highest temperature of the double U-shaped,triangular throttle groove spool was always at the throttle groove.As the pressure difference between the valve inlet and outlet increases,the maximum flow rate of the oil,as well as the highest temperature and maximum deformation of the spool of the two types of throttle groove forms increase,and the deformation of the spool of the triangular throttle groove is smaller;With the increase of spool opening,spool temperature and maximum deformation of the triangular throttle groove spool are smaller than that of the double U-shaped throttle groove spool;The maximum deformation of the triangular throttle groove spool decreases by 25.1％compared with that of the double U-shaped throttle groove spool.This study provides a reference for the design of spool throttling grooves of multi-way valves for agricultural machinery.
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