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大多数离心泵采用填料密封。其圆柱形填料腔的填料密封是通过填料压盖来实现的。但压盖松紧难掌握，保证密封难度较大。采用锥形填料腔其密封不是靠固体填料与旋转轴套紧密贴合来阻止内部液体泄出，而是通过填料与旋转轴套之间紧密贴合形成一层很微薄的环隙，环隙里充满润滑油
Most centrifugal pumps are packed with packing. The packing seal of its cylindrical packing chamber is achieved by the packing gland. But gland loose grip difficult to ensure greater sealing difficult. The use of conical packing chamber seal is not by solid packing and rotating sleeve close fit to prevent the internal liquid leakage, but through the packing and the rotating shaft sleeve closely fit between the formation of a very meager ring gap, the ring gap Filled with oil