我国现在生产的BA型离心式水泵,轴的结构如图1所示。其结构主要有两个不够合理的地方:(1)由于填料部分的轴段5直径大于轴颈直径,因此,两只滚动轴承2、4都得从联轴器档一端才能装配和拆卸。这样,轴承的装卸不但不方便,而且增加了轴承2处轴颈的磨损,缩短了泵轴的使用寿命;(2)由于填料5处的轴段与轴为一整体,磨损后该轴必须整体更换。鉴于上述情况,我们对一台6BA-8型泵轴进 China now produces BA-type centrifugal pump, shaft structure shown in Figure 1. There are mainly two unreasonable structures: (1) Since the diameter of the shaft section 5 of the packing section is larger than the diameter of the journal, both of the two rolling bearings 2 and 4 can be assembled and disassembled from one end of the shaft of the coupling. In this way, the loading and unloading of the bearing is not only inconvenient, but also increases the wear of the journal at the bearing 2 and shortens the service life of the pump shaft. (2) Since the shaft section of the filler 5 is integrated with the shaft, replace. In view of the above, we are a 6BA-8-type pump shaft