upper impeller的意思|示意

With the decreasing of C1, the radial flow generated by the lower impeller, the axial flow generated by the upper impeller, and the axial flow of the main circulation increased.

降低下层桨的离底高度能加强下层桨的径向流动，并增大上层桨叶轮区和循环区流体的轴向流动。

Maintenance difficulty is different, vertical pump maintenance is difficult, such as repair impeller should be the upper can all move to the rear;

维修难度不同 ， 立式三螺杆泵检修难度大 ， 如检修叶轮需将上部全部移去后方能进行 ；

Each rotor impeller is composed of a cast iron frame, a graphite casing, an upper main shaft, a lower main shaft, the graphite impeller and the belt wheel.

转子叶轮由铸铁支架、石墨套管，上部主轴、下部主轴、石墨叶轮和皮带轮构成。