The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.
形状为沿对称轴对折
椭圆，此对称轴始终垂直于轴截，其方向与平图上
道中线无关。
The shape of cross-section is an ellipse folded in half through one symmetry axis, and the axis keeps perpendicular with pinacoid-view.
形状为沿对称轴对折椭圆，此对称轴始终垂直于轴截，其方向与平图上道中线无关。
The drawing method for the double channel impeller is studied.It is found that there is an in-conformity between the dimensions of plane-view and pinacoid-view of fluid cross-section.
摘要研究了双道污水泵叶轮常用图纸表达方法，发现平图上投影结果与轴图中确定形状尺寸不一致
。
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