Which are main faults of vibration mechanical part of Cummins Generator Set?

The structure of the Cummins generator set includes two parts, electrical and mechanical, and its failure should be divided into two parts. The reasons for the vibration failure are also divided into two parts.

From the assembly and maintenance experience of MAMO POWER over the years, the main faults of the vibration mechanical part of Cummins generator set are as follows,

Firstly, the shaft system of the linkage part is not centered, the center lines are not coincident, and the centering is incorrect. The cause of this failure is mainly caused by poor alignment and improper installation during the installation process. Another situation is that the center lines of some linkage parts are coincident in the cold state, but after running for a period of time, due to the deformation of the rotor fulcrum, foundation, etc., the center line is damaged again, resulting in vibration.

Secondly, the gears and couplings connected to the motor are faulty. This kind of failure is mainly manifested in poor gear engagement, serious gear tooth wear, poor lubrication of the wheel, skew and misalignment of the coupling, incorrect tooth shape and pitch of the toothed coupling, excessive clearance or serious wear, which will cause certain damage. vibration.

Thirdly, defects in the structure of the motor itself and installation problems. This kind of fault is mainly manifested as the journal ellipse, the bending shaft, the gap between the shaft and the bearing bush is too large or too small, the rigidity of the bearing seat, the foundation plate, a part of the foundation and even the entire motor installation foundation is not enough, and the motor and the foundation plate are fixed. It is not strong, the foot bolts are loose, the bearing seat and the base plate are loose, etc. Excessive or too small clearance between the shaft and the bearing bush can not only cause vibration, but also cause abnormality in the lubrication and temperature of the bearing bush.

Fourthly, the load driven by the motor conducts vibration. For example: the vibration of the steam turbine of the steam turbine generator, the vibration of the fan and the water pump driven by the motor, cause the vibration of the motor.