双吸离心泵因其流量大、运行稳定等优点被广泛用于小氮肥厂循环水系统中，但是由于这类泵大多采用填料密封，因而存在水外漏率超标，动点泄漏率超过２％的问题，为此需经常压紧填料压盖，这又造成轴套磨损加快，设备运行周期缩短，检修工作量和费用都相应增加，给车间设备... Double suction centrifugal pump is widely used in circulating water system of small nitrogenous fertilizer plant due to its large flow rate and stable operation. However, because of the packing seal of such pumps, the leakage rate of water exceeds the standard, and the leakage rate of moving point exceeds 2% The problem, for which it is often required to compress the packing gland, which in turn causes the sleeve to wear faster, shorten the cycle of equipment operation, maintenance workload and costs are increased accordingly to the workshop equipment.