混流泵
（二）泵盖是泵与进水管相连的零件，其端面与叶轮之间留有规定的轴向端面间隙（在消除轴承轴向活动间隙以后，保持规定的轴向间隙）。间隙过小产生磨擦，过大则会导致泵内压力水回流，使泵的效率降低，通过增减调整纸垫达到规定的间隙。
II. Pump cover is
the part connected with water inlet pipe.There is an stated axial end face gap
between its end
face and
impeller(Keep the stated axail gap after removing the bearing axial movable
gap).Friction will be
produced if
the gap is too ***all, contrary, if the gap is too large, the pressure water in
pump will reflux which
makes the
feeiciency reduced.Adjust the paper washer and make the gap be stated one.
3、安装基础：要求土质坚实牢固。
4、水泵安装时，必须保证泵轴的水平位置。
5、进水管末端应浸入水平面以下一米左右，但须离开泥底半米左右。
6、水泵安装好后，计算允许吸上高度和扬程，在水位稳定的条件下，要求为规定数量值的0.8~1.2倍范围，否则水泵不会正常运行
I.
Installation Principle
1. Installation
Height: C***idering the height according to the rainy season or dry season.The suction
vacuum
height can
not be higher than the adsorbing height.
2. Installation
Location:The location is better to close to the water source as p as
should be not
only
keeping the safety but also shortening the water inlet pipe and reduce the
headloss
振动原因分析
水泵振动原因分析导致机组和泵房建筑物产生振动的原因较多，有些因素之间既有联系又相互作用，概括起来主要有以下四个方面的原因。
电气方面
潜水泵电机是机组的主要设备，电机内部磁力不平衡和其它电气系统的失调，常引起振动和噪音。如异步电动机在运行中，由定转子齿谐波磁通相互作用而产生的定转子间径向交变磁拉力，或大型同步电机在运行中，定转子磁力中心不一致或各个方向上气隙差超过允许偏差值等，都可能引起电机周期性振动并发出噪音。泵叶轮转向：从泵进口方向看，叶轮转向为顺时针，当泵与柴油机直联传动时，为逆时针。