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在同水泵打交道的人中间(其中包括一些常搞水泵的人)有时拿起一张水泵叶片木模图一时判断不清叶轮的旋转方向。也有个别水泵叶轮木模图,把转向绘反了,如叶轮木模图绘成顺时针而图纸文字却写成逆时针旋转。关于绘制水泵叶片木模图时,工作面与背面绘制的位置,有的书上作了具体规定,一些书上未明确写出。设计人员有不同的习惯画法,如有的图把工作面与背面用实虚线条区别表示在同一个投影方向上。还
In the middle of dealing with the pump (including some people often engage in the pump) sometimes pick up a pump blade wood pattern at a glance to determine the direction of impeller rotation. There are also individual pump impeller wood pattern, turn the steering painted anti, such as the impeller wooden figure painted clockwise and the drawings are written text counterclockwise rotation. On the drawing of the pump blade wood pattern, the face and the back of the drawing position, and some books made specific provisions, some of the book is not clearly written. Designers have different habits painting method, as shown in the figure and the back of the real lines of difference between the same projection in the same direction. also