One, improper installation of the pump noise caused by the installation of the time we talk about a flat, two stable three solid, flat refers to the level of the pump installation feet must be to maintain the level (in special circumstances, another case) can not be tilted, stable refers to the must be solid, can not be loose and shaky shaky. Solid means that the installation of the foundation must be solid and stable, not this side of the ground on the other side of the overhang. In addition, in order to avoid *** vibration caused by *** sound noise, pipeline pump feet should be installed vibration pads, imports and exports also have to be installed on the expansion joints (soft joints). Why do this? Because the pump in operation, the motor has a certain noise and accompanied by a slight jitter, if not installed vibration pads, then the pump and the foundation will produce a chain reaction between the *** vibration so that the jitter to strengthen. Inlet and outlet if not installed expansion joints, then the motor's shaking and noise will be transmitted to the pipeline, the pipeline is like a *** sound cavity will make the shaking and noise further strengthened. At the same time in the pipeline water resistance and pressure under the action of the pipeline will also sound and vibration, so it is necessary to install expansion joints to eliminate the pipeline and pump between the *** vibration and *** sound. Second, the noise caused by the pump impeller imbalance, some pumps used for a long time impeller in operation or was sucked into the pump cavity debris injury or other reasons lead to impeller loss of balance, left light right heavy, head heavy light, this time in the case of high-speed motor operation will lead to the motor bearings bearing the strength of the weight of the weight is not the same so as to produce noise, at the same time the motor shaft will also be imbalanced impeller affected by the different centrifugal At the same time, the motor shaft will also be affected by the unbalanced impeller to different centers, thus generating noise. Third, ISG pipeline pump bearing damage caused by noise, has been damaged bearing physical photos), some customers will pump installed in the outdoors, and there is no cover the use of the case, the rain will be from the motor wind cover by the wind blades sucked in, if the intrusion into the motor back cover bearing chamber will make the bearings oxidation and rust, bearing ball is no longer smooth, it will issue mechanical noise. If installed in the case of indoor this problem generally does not occur, but there will be another situation, if the mechanical seal is damaged between the timely replacement, as usual, without stopping the machine water, then the mechanical seal to lose the sealing effect of the pump running in the pump chamber pressure leads to water sprayed out of the pump body within a short period of time on the motor shaft of the water retaining ring can protect the motor bearings not to be invaded by the water, but the water sprayed more and more! Invade the bearing room after the same will damage the bearings. At this time, the sound of the running pump may be like a train over the railroad tracks, very noisy.