偏心销对水轮机圆柱式导水机构开度的影响分析

在水轮机圆柱式导水机构中,偏心销常用来补偿制造偏差及表面磨损,但其对导叶开度的影响容易被忽略.首先通过建立具有代表意义的理想开度机构,分析得到不含偏心销结构的开度机构运动关系.然后将常见的两种偏心销结构引入理想开度机构中,利用MATLAB计算得到了偏心销对导叶全开转角的影响曲线.分析表明,影响导叶开度的主要因素为偏心销...

Analysis on influence of eccentric pins on opening of cylindricalwater distributor of hydro turbines

In the cylindrical water distributor of a hydro turbine,eccentric pins are usually used to compensate manufacture deviations and worn surfaces,but their influence on the opening of wicket gates is often ignored.First,this paper develops an ideal model for the gate opening and derives a motion relationship among the assembled parts to realize the gate opening mechanism for the case without eccentric pins.Then,using this model,we examine two types of eccentric pins and use Matlab to calculate and depict curves representing the influence of the pins on the angle of the fully opened gates.The analysis shows that two dominant factors are the eccentricity of the pins and those parts that are locked to the pins,and the latter factor is more significant and should be emphasized.In design and installation,a reasonable eccentricity and appropriate locked parts should be considered and selected,and the same eccentric direction should be guaranteed for the eccentric pins locked to the regulating ring.