高压大流量安全阀卸荷过程模型构建及仿真分析

Model building for unloading process of high pressure large flow relief valve and its simulation analysis

为建立大流量安全阀在卸荷过程中的准确物理模型,对现有最大流量为1 000 L/min的矿用液压支架安全阀进行结构分析.建立了大流量安全阀内部流道的三维几何模型,采用ANSYS Workbench软件以定压差为条件,研究安全阀阀芯从0到最大开度时的阀芯内部流场及压力分布规律.仿真结果表明,在卸荷过程中,从阀体入口到阀芯顶端所受液压力由于压力损失,最大降低了约3 MPa.因此,将阀芯前端部分简化成一个固定节流口,并以此为基础,提出了符合实际工况的安全阀物理模型,针对此物理模型建立了其动态数学模型,并对其进行仿真分析,仿真结果与实际测试结果基本一致.这为研发大于1 000 L/min的大流量安全阀提供了理论参考.

To establish an accurate physical model of the large flow safety valve in the process of unloading, the structural of existing maximum flow rate of 1000 L/min of hydraulic mining stent valve was analyzed. Three-dimensional geometric models of internal flow channel of the large flow relief valve were established. Using ANSYS Workbench, under the condition of constant pressure difference internal flow field and pressure distribution of relief valve core from zero to maximum opening were studied. The simulation show that liquid pressure of valve core from entrance to top is reducing due to the pressure loss, and the biggest reduction is about 3 Mpa. Therefore, the front part reduces to a fixed throttle, and on this basic, a physical model of valve which conforms to actual working condition is proposed. According to the physical model, the dynamic mathematical model was established, and the simulation results are basically consistent with the actual test results. This study provides a theoretical reference for the future research and development of large flow safety valve greater than 1000 L/min.