Vibration Analysis Of Centrifugal Pumps

1. The rotor of the centrifugal pump is unbalanced and misaligned. This problem accounts for a large proportion of about 80% in the vibration problem of centrifugal pumps. The factors that cause the imbalance of the centrifugal pump rotor include uneven material blocking and unqualified part structure, resulting in the eccentricity formed by the non coincidence of the rotor mass centerline and the shaft centerline. The correction of rotor imbalance in centrifugal pumps can be divided into two parts. Static balance and dynamic balance: generally also known as single-sided balance and double-sided balance. The difference is that single-sided balance is calibrated on one calibration face, while double-sided balance is calibrated on two calibration faces.
2. Installation reason: The foundation bolts are loose and the levelness of the calibration is not adjusted properly. Before the centrifugal pump starts working, it is necessary to check whether the foundation bolts are loose and whether the installation of the centrifugal pump is level. These can also cause vibration in centrifugal pumps during operation.
3. There are foreign objects inside the centrifugal pump. Before operating the centrifugal pump, it is necessary to inspect the inside of the pump. Due to long-term use, there may be some foreign objects inside the centrifugal pump, such as weeds in the water.
4. Due to prolonged use, cavitation perforation occurs inside the centrifugal pump.
5. There are unreasonable situations in the design of centrifugal pumps, such as issues with part size and dimensions. However, this situation is relatively rare. Before leaving the factory, centrifugal pumps undergo multiple inspections inside the workshop to ensure their qualification rate.