灌溉用压力调节器性能试验与受力分析

为了研究灌溉系统压力调节器的工作特性与结构参数的关系,对7种内置弹簧式规格的低流量压力调节器进行了调压特性试验,对压力调节器的弹簧参数与出口预置压力的关系以及内部运动部件的受力情况进行了分析.结果表明,压力调节器的出口预置压力越低,调压性能越优良,测得的临界工作压力与出口预置压力之差随着出口预置压力的增大而增大,并非常数0.034 MPa;随着出口预置压力的上升,内置弹簧丝直径越粗,弹簧自由长度越短,其弹簧刚度系数越大;压力调节器调节组件所受的初始弹簧力和最大弹簧力与出口预置压力存在近似的线性关系,而且在向压力调节器进口端运动的过程中,调节组件所受的弹簧力占其出口所受水压作用力从57.9%逐渐增大至66.5%,而密封圈摩擦力和橡胶膜片变形力之和占出口所受水压作用力则从39.9%下降至31.3%.

Performance test and force analysis of pressure regulator used in irrigation system

In order to study the relationship between the pressure regulating properties and the structural parameters of pressure regulator used in irrigation system,tests on the pressure regulating properties of seven low flow types of pressure regulators integrated with springs were conducted.The relationship between the spring parameters and the preset outlet pressure,and the forces acting on the built-in moving parts were also analyzed.The results showed that pressure regulator with lower preset outlet pressure has higher performance of regulating.The difference between measured critical working pressure and preset outlet pressure increases with the preset outlet pressure and is not equal to a constant of 0.034 MPa.As the preset outlet pressure increases,the spring stiffness constant increases with a larger spring diameter and a shorter spring natural length.Both the initial and maximum spring forces are in positive linear relationship with the preset outlet pressure.As well,when the regulating part moves toward the inlet of the pressure regulator,the ratio of spring force to hydrostatic pressure exerting on the outlet cross-section of the regulating part increases with an average from 57.9% to 66.5%,and the sum of friction force of the sealing part and the deformation force of rubber diaphragm decreases with an average from 39.9% to 31.3%.