对于稀油润滑的泵，我们以知名品牌KSB离心泵MCPK为例子，常见的油封形式有两种，一种是较为常见的骨架油封也叫唇封，另一种叫迷宫式密封。
For the thin oil lubrication pump, we take the well-known brand KSB centrifugal pump as an example, there are two common oil seal forms, one is the more common skeleton oil seal, also called lip seal, and the other is called labyrinth seal.
骨架油封Lip seal
对于新泵出现的油封漏油的情况，首先客户加油没有按照操作手册来，把油加多了，另一种可能是在工厂组装完，喷漆时没有把油封处做保护，让密封处有油漆，使得泵运行过程中油封处出现泄露。线条状的油漆被油封切下来。
For the oil seal leakage of the new pump, first of all, the customer did not fill the oil according to the operation manual, and added more oil. Another possibility is that after the assembly of the factory, the oil seal was not protected when painting, so that the seal was painted, which made the oil seal leak during the operation of the pump. The line of paint are cut off by the oil seal.
轴密封处被喷了油漆The shaft seal place was sprayed with paint
另外一种情况是，使用了迷宫式油封的情况。轴承压盖上面加工了油沟和回油孔。往往漏油出现在驱动端，拆开泵轴承压盖，会在轴上看到很明显的沟痕印记，分析其原因，可能是驱动端侧的压盖暴露在空气中接触水汽和灰尘的概率大于受到防护罩网保护的非驱动端，当铸铁材质的压盖与轴接触的部位有灰尘聚集或生锈时，压盖与轴的间隙过小，导致泵在运转时油封处出现虹吸漏油现象，当将压盖内孔与轴的间隙通过砂纸或袖珍锉刀清理后，漏油的问题就会被解决掉。
The other case is that the labyrinth oil seal is used. The oil ditch and oil return hole are processed on the bearing gland. When you open the pump bearing gland, you will see obvious grooves on the shaft. Analyze the reason. It may be that the gland on the side of the drive end is exposed to water vapor and dust in the air, which is greater than that on the non-drive end protected by the protective mesh. When the pump is running, there is a siphon oil leakage phenomenon at the oil seal. When the gap between the inner hole of the gland and the shaft is cleaned by sandpaper or a pocket file, the problem of oil leakage will be solved.
