The vibration of centrifugal pump is very harmful, but it is unavoidable. The vibration can reduce the service life of the parts. Especially for shaft, seal, bearing damage is huge. When it is serious, it will pull off the anchor bolts, crack the inlet and outlet pipe, or break the bolt of the inlet flange, or turn the valve, or even destroy the workshop. There are many ways of vibration, and there are many ways to reduce the vibration. For high speed centrifugal pumps and centrifugal compressors, vibration is a serious problem, and it must be paid enough attention.
One. Analysis and judgment of the cause of vibration
In order to analyze the causes of vibration, it is necessary to grasp the vibration characteristics of several common unbalance factors.
The 1. rotor imbalance is characterized by a large vibration of the two bearing. When the loading speed rises to the rated value, the amplitude increases very fast, and the amplitude decreases with the balance weight method.
2. when the center of the unit is not correct, the vibration is characterized by the increase of vibration with the load, and sometimes it will change suddenly. At this point, the method of weight can not be used, such as the method of weight distribution, then the vibration is aggravated.
3. when the supporting parts are defective, such as the rigidity of the foundation is not enough and the fasteners are loose, the vibration is characterized by the vibration during the empty load, and the amplitude is unstable. Health level self-priming pump
4., when the lubrication is not normal, the bearing clearance is large, and the oil film is destroyed, the characteristic of vibration is, because the oil film is damaged, sometimes the oil supply is not. When the operation condition changes, the vibration value changes. When vibration is accompanied by abnormal jitter and noise.
5. when the rotor and the casing friction, the vibration is characterized by vibration in the vicinity of the rubbing place, when the machine stops turning, it is easy to hear the sound of friction.
6. if the axial vibration is not due to the unbalance of the mass, it is mostly caused by the decrease of the stiffness of the front bearing seat.
Of course, sometimes the cause of vibration is more complex and requires a comprehensive analysis of the causes of all kinds of vibration.
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