Roots blower bearing damage reasons

Due to the continuous operation of Roots blower for a long time, the temperature rise of the motor body is too high, and the oil filling grease for the bearing is not timely added, resulting in the bearing oil shortage until the bearing is damaged, the shaft bending, belt fracture and other phenomena. As a result, the stator and rotor friction (commonly known as sweeping the bore) causes the core temperature to rise sharply, and the groove insulation and turn to turn insulation are burned out, resulting in the turn to turn winding Short circuit or “blasting” to the ground will cause stator core to be inverted slot, dislocation, shaft wear, end cover scrapping and so on. Bearing damage is generally caused by the following reasons:

Bearing

1. Improper assembly of Roots blower bearing, such as uneven knocking on the bearing inner ring during cold assembly, causes the shaft to be worn, resulting in the loss of interference between the bearing inner ring and outer ring or the interference amount becoming smaller, resulting in the phenomenon of running the inner ring. When installing the motor end cover, the uneven knocking results in the loose fit between the bearing chamber of the end cover and the outer ring of the shaft. No matter running the inner ring or outer race, the temperature rise of bearing will rise sharply. As long as the bearing is in good condition, intermittent running of outer ring is allowed.

2. The bearing wall is not cleaned or the grease is not clean. For example, the bearing keeps a small amount of steel material. In order to clean it thoroughly, the running is that the bearing is damaged and the temperature rise is too high to burn the bearing.

3. Bearing replacement processing, motor end cover nested after large interference or ovality excessive, resulting in bearing ball clearance is too small or uneven, resulting in bearing friction increased, temperature rose sharply until burned.

4. Due to the axial dislocation of stator and rotor cores or insufficient precision after re machining the rotating shaft, the inner and outer rings of the bearing are not in the same section, which causes the temperature rise after bearing operation and even burns out.

5. Bearing damage is caused by mixing different types of grease.

6. The bearing itself has quality problems, such as raceway rust, inflexible rotation, too small clearance, cage deformation and so on.

7. The standby machine does not run for a long time, the grease is deteriorated and the bearing is rusty. Only the maintenance and maintenance of the spare machine can be used. Pay attention to regular inspection and regular replacement of the same brand of grease.