配合间隙对溢流阀稳态液动力的影响

针对稳态液动力影响电液比例溢流阀调压精度的问题，建立了内流式滑阀液动力数学模型，基于CFD仿真平台，构建了考虑配合间隙的滑阀模型，并搭建了试验平台以验证模型的正确性，研究了不同配合间隙对滑阀稳态液动力的影响。结果表明：考虑配合间隙的滑阀模型与试验测试结果有很好的一致性；溢流阀在工作过程中，阀口开度与配合间隙非常接近,随着压力升高，阀口开度变小，射流角接近20°；随着配合间隙增大，阀口开度变小，射流角变大；配合间隙在一定范围内，液动力随着间隙增大而增大，当达到临界值后，配合间隙对液动力的影响变小。

Influences of Fit Clearances on Steady-state Fluid Forces of Relief Valves

Aiming to solve the pressure regulating precision of electro-hydraulic proportional relief valves affected by steady-state fluid forces, a flow force mathematical model of converged flow spool valves was built. The valve model considering fit clearances was established based on CFD, and a test rig was set up to validate the correctness of the model. Then the influences of different fit clearances on steady-state fluid forces of spool valves were studied. The results show that the spool valve model considering fit clearances has a good coincidence with test results. While relief valve is working, the valve opening is close to fit clearance extremely. As pressure increases, valve opening becomes smaller, and jet angle gets close to 20°. As the clearance increases, valve opening turns smaller, jet angle becomes bigger. In a certain ranges, steady-state fluid forces increase with the increase of clearances, and fit clearances have a small influence on steady-state fluid forces when clearances reach the critical values.