​Due to the passage of air compressor operation time, each bearing of the main engine is bound to be damaged, which may cause the screw to cause axial movement and radial displacement to increase, which will change the clearance between the screw and the screw, the screw and the main shell and the front and rear end faces. This clearance change is normal and allowed within the bearing life time, and the resulting air compressor gas production loss and motor load increase are also normal and allowed.
Since the service time of the unit is close to the maintenance period of the main engine, the life of the main engine bearing slowly advances to the larger allowable period. At this time, the axial and radial momentum of the screw slowly advances to the larger design specified value, and the main engine operation is still very safe, but it is already a time to consider arranging maintenance for the main engine. If once the unit has turned over the maintenance period, the bearing damage and the main engine assembly clearance reach the specified value of the main engine with technical conditions, then the main engine is already in a dangerous working state, it may occur at any time as follows serious consequences:
1, the operation load of the main engine increases, causing adverse effects on the motor and electrical system
​ The strong friction that may occur in the middle of the host screw, the middle of the screw and the front and back end faces, and the middle of the screw and the host housing will increase the operating load of the host rapidly, and the operating load of the worn bearing is also very large. In this way, the motor will be in a state of overload operation, which will greatly damage the safe operation of the motor. More serious, if the air compressor electrical protection device reflects slow or failure, it will also lead to motor damage.
2, the air compressor exhaust volume will appear a large loss.
The increase of the main machine assembly gap will also lead to a significant reduction in the high efficiency of the main machine, that is, the air compressor exhaust volume causes a large loss, which has a great impact on the normal operation of the gas department. Especially for those users who are equipped with a relatively small amount of air compressor exhaust volume, due to the loss of air compressor exhaust volume, under the premise that the gas supply of the gas system is relatively stable, the compressed air pressure of the pipeline network will decrease a lot, and it is possible that the gas system equipment can not operate normally or can not work at all, and even affect the normal operation of the unit and lead to a temporary shutdown. Bring losses to the company.
3, the most serious problem is that the host suddenly "hug".
Once this happens, if the electrical protection system does not reflect in place or the protection fails, it may also cause obvious adverse effects on the motor and electrical system.
For the host "holding" processing, not only the maintenance cost of maintenance is much more expensive than normal maintenance, but at the same time, due to the damage of the host components, the overall performance of the host after repair will be worse than the normal maintenance of the host. However, if the severity of the host damage is already no repair value or no way to repair, it can only be scrapped and replaced by the host, and the direct economic loss is great. Because the cost of the new purchase of the host is generally one-third of the cost of the entire air compressor, far more than the maintenance cost of the host under normal circumstances, and usually the maintenance of the qualified host comprehensive technical specifications are very similar to the new host!