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如今市场上的大部分化工泵还都停留在二三十年以前的设计水平上,那时轴封采取填料函。其特征是轴径小(填料作为悬臂轴的第三个支撑),密封腔压力高,轴向间隙过大。
Most of the chemical pumps on the market today are still stuck at the design level of two or three decades ago, when the shaft seal was stuffed. It is characterized by small shaft diameter (filler as the third support of the cantilever shaft), high pressure in the seal chamber and excessive axial clearance.