多路阀滑阀节流槽计算方法研究
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摘要
工程机械上,多路阀常通过在阀芯节流边加工不同形状的非全周开口节流槽以满足不同阀芯流量控制特性。由于非全周开口节流槽复杂多变的结构特点,传统而相对简单的截面面积计算公式难以完成面积精确的计算。利用CFD仿真软件,对双U节流槽的三维流场压力进行仿真分析,推导了面积与压力变化之间的关系,并根据节流槽液体流动结构形式确定了局部压力损失系数,得到非全周开口计算面积与节流槽结构参数之间的关系方程。通过AMESim软件进行液压系统仿真分析,并最终通过试验进行了验证。研究发现通过该方法能快速准确地完成各种非全周开口滑阀开口面积的设计,对非全周开口滑阀流量设计、液动力预测及其振动和噪声的控制具有重要意义。
In the field of construction machinery, different shapes of the non-circular opening throttling grooves are often taken in multi-way valve for different flow control characteristics. Because of the complex and changeable structure characteristics of non-circular throttling grooves, the traditional and relatively simple calculation formula of the cross-sectional area is difficult to complete the accurate calculation of the area. CFD simulation software was used to simulate and analyze the three-dimensional flow field pressure of dual-U throttling groove,and the relationship between the area and the pressure was deduced. The local pressure-loss-coefficient according to the liquid flow form was determined,and the relationship equation between the calculation area of non-circular opening and the structure parameters of the throttling groove was obtained. AMESim simulation and test results are basically the same. The results indicate that this method can quickly and accurately complete the design of opening area about various non-circular opening valve,which has important significance for flow designing, flow force prediction and the control of vibration and noise.
In the field of construction machinery, different shapes of the non-circular opening throttling grooves are often taken in multi-way valve for different flow control characteristics. Because of the complex and changeable structure characteristics of non-circular throttling grooves, the traditional and relatively simple calculation formula of the cross-sectional area is difficult to complete the accurate calculation of the area. CFD simulation software was used to simulate and analyze the three-dimensional flow field pressure of dual-U throttling groove,and the relationship between the area and the pressure was deduced. The local pressure-loss-coefficient according to the liquid flow form was determined,and the relationship equation between the calculation area of non-circular opening and the structure parameters of the throttling groove was obtained. AMESim simulation and test results are basically the same. The results indicate that this method can quickly and accurately complete the design of opening area about various non-circular opening valve,which has important significance for flow designing, flow force prediction and the control of vibration and noise.
引文
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