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研究了双流道污水泵叶轮常用的图纸表达方法,发现平面图上的断面投影结果与轴面图中确定的断面形状尺寸不一致的问题.断面形状为沿对称轴对折的椭圆,此对称轴始终垂直于轴截面,其方向与平面图上的流道中线无关.传统设计中认为以垂直于平面图上的流道中线确定的截面尺寸并不符合实际的投影关系.这是设计中经常出现的双流道叶轮平面图、断面面积图与叶轮木模图三者不一致的主要原因.提出在双流道污水泵叶轮设计时,平面绘型作为初步设计,然后在三维造型中确定其余参数,再由三维造型来生成平面绘型,以保证设计与木模一致.设计结果表明,这种设计步骤是合理的.
The common blueprint expression method of double-channel sewage pump impeller is studied, and it is found that the cross-sectional projection result of the plane diagram is inconsistent with the cross-sectional shape and size determined in the axial plane diagram.The cross-section shape is an ellipse folded symmetrically along the symmetry axis, Axial section, the direction of the plane and the centerline of the runner has nothing to do.Traditionally, the design that the cross-sectional size perpendicular to the midline of the plan does not meet the actual projection relationship.This is often seen in the design of dual-flow path impeller plane , Sectional area chart and impeller wood pattern are not the main reasons.Proposed in the design of dual-channel sewage pump impeller, plane drawing as a preliminary design, and then determine the remaining three-dimensional modeling parameters, and then by the three-dimensional modeling to generate a plane drawing Type, in order to ensure the design consistent with the wooden mold.The design results show that this design step is reasonable.