山东黄金集团三山岛金矿新立分矿有30多台2PNL立式泥浆泵,在使用过程中经常出现泥浆泵下轴承磨损过快,需频繁更换。经分析,主要是下轴承密封不好,造成矿浆或者污水进入轴承室,导致轴承过早报废。为此对原密封设计进行了如下改进:将原来的单件骨架密封圈密封改为双层密封(见图1);加大了迷宫环和迷宫套的密封深度;加强了迷宫环的紧固性, There are more than 30 2PNL vertical mud pumps in Shali Gold Mine of Sanshandao Gold Mine of Shandong Gold Group. In the process of using, mud bearings often wear under too fast and need to be replaced frequently. After analysis, the main bearing seal is not good, resulting in pulp or sewage into the bearing chamber, leading to premature bearing scrap. To this end the original seal design were improved as follows: the original single-piece skeleton seal to double seal (see Figure 1); increase the labyrinth ring and labyrinth seal depth; strengthen the labyrinth fastening Sexuality,