Study on steady-state flow force compensation of hydraulic spool
A diversion groove structure was designed on the spool to compensate the steady-state flow force to solve the difficulty in compensating steady-state flow force of hydraulic spool.When the liquid flows through the diversion groove,due to the reverse diversion effect of the diversion groove,the liquid flow component along the opposite direction is generated.The interaction between this part of the liquid flow component and the forward moving liquid flow increases the jet angle at the outlet and the flow force decreases.The steady-state flow force model was analyzed and deduced.The influence of changes in the structural parameters of the diversion groove on the steady-state flow force was studied by CFD simulation,and the compensation principle of the diversion groove was revealed.The experimental results show that the steady-state flow force of the spool with diversion groove is significantly reduced relative to that of the spool without diversion groove.When the pressure difference is 2.5 MPa,the average decrease of the flow force under each opening is 52.7%;when the pressure difference is 3.5 MPa,the average decrease of the flow force under each opening is 47.7%;and when the pressure difference is 4.5 MPa,the average decrease of the flow force under each opening is 33.9%.The diversion groove structure can effectively compensate the steady-state flow force and improve the control accuracy of the spool.
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