The analysis for vibration of roots blower

The vibration caused by the imbalance of the Roots blower impeller itself can be caused by the following: due to loose, variation, deformation or uneven corrosion and abrasion of parts on the impeller; solid particles in the working medium are deposited on the rotor; The weight of the new replacement parts is uneven; the material of the impeller is not absolutely symmetrical in manufacturing; there are errors in machining accuracy and assembly deviations.

Bellow are some common causes:

The clearance between the impeller of the roots blower and the main shaft is too large.

The spindle is somewhat bent.

The rigidity of the foundation or machine base is insufficient or weak, the foundation steel plate is weak, the pad iron is loose, and the displacement; the anchor bolts are loose, etc.

The foundation is sinking, inclined or cracked.

The installation level of the unit is not good, and the rotor deflection has changed.

The alignment error of the coupling center caused by poor installation of Roots blower is too large.

The clearance between the coupling and the shaft is too large; the clearance of the elastic sleeve is too large or the clearance is uneven.

There is friction in the casing, and the impeller skews and collides with the inner wall of the casing