air end motor 1616754080 machine repair characteristics
The structure of the main engine of the oil injection twin screw air compressor (also known as the head) is usually composed of a pair of screw meshing with each other, the main body shell, the high pressure end and the end cover and the low pressure end and the end cover.
When the main engine of screw air compressor runs normally, there is no contact between the screw and the screw, between the screw and the main shell and the end face of the high and low pressure, which is mainly ensured by the following three aspects:
1, screw, host shell and high and low pressure end processing are high precision. The precision ensures that after the main machine is assembled, there is a proper clearance between the screw and the screw, and between the screw and the main machine shell. The clearance size has fully taken into account the deformation of the screw and the shell when the main machine is running at high temperature.
2, the size of the gap between the screw and the high and low pressure end face is guaranteed in accordance with the technical requirements of the screw assembly. The main engine running screw no axial channeling movement, and the radial displacement of the screw is guaranteed by high precision bearings;
3. The air end motor 1616754080 film formed by the lubricating oil during the normal operation of the main engine makes the screw not in direct contact with the screw.
However, with the passage of air compressor running time, the main engine each bearing is bound to wear, resulting in the axial channeling of the screw and the increase of radial displacement, the change will make the clearance between the screw and the screw, the screw and the host shell and the front and rear end face change. These clearance changes are normal and allowed during the life of bearings, and the resulting air compressor gas production attenuation and main motor load increase are normal and allowed.
As the running time of the unit approaches the overhaul period of the main engine, the life of the main engine bearing gradually approaches the maximum allowable time. At this time, the axial and radial channeling momentum of the screw gradually approaches to the maximum allowable design value, the change will make the clearance between the screw and the screw, the screw and the host shell and the front and rear end face of the greater change. While the host is still safe to run, it is time to consider scheduling an overhaul of the host.
Because once the running time of the unit has passed the overhaul period, bearing wear and the clearance of the main engine have reached the limit value allowed by the technical conditions of the main engine. At this time, the main engine is in an unsafe operating state, and the following serious consequences may occur at any time:
1. The increase of the running load of the main engine will cause harm to the main motor and electrical system
The strong friction that may occur between the host screw, between the screw and the front and rear end faces, between the screw and the host shell will make the host operating load increase sharply, and the running load of the seriously worn bearing is also very large. In this way, the motor will be in overload working state, will seriously endanger the safe operation of the motor. If the situation is serious, if the electric protection device of the air compressor unit is not sensitive or fails, it may also lead to the motor burning.
2. The exhaust volume of air compressor will decrease significantly.
The increase of the main engine matching clearance will lead to the serious reduction of the efficiency of the main engine, that is, the air compressor exhaust volume will be greatly attenuated, which will have a certain impact on the normal production of the gas unit. Especially for those users whose air compressor exhaust configuration is rich and small, due to the attenuation of air compressor exhaust volume, under the condition that the gas consumption of the gas system is relatively stable, the compressed air pressure of the pipe network will be reduced a lot. It may occur that the equipment of the gas system cannot work normally or cannot work at all, thus affecting the normal production of the unit or causing temporary production suspension. Bring losses to the enterprise.
3. The most serious consequence is the sudden "hug" of the host.
Once such a situation occurs, if the electrical protection system does not respond in time or fails to protect, it may also bring serious damage to the main motor and electrical system.
For the host "lock" processing, on the one hand overhaul maintenance costs will be much more expensive than normal overhaul, on the other hand due to the host components will be damaged, so the overall performance of the repaired host will be worse than the normal overhaul of the host. If the damage of the main engine is so serious that it has no repair value or can not be repaired at all, it can only be scrapped and replaced with a new main engine, and the direct loss is the biggest. Because the cost of the new purchase of the host is usually about one third of the cost of the whole air compressor unit, far higher than the cost of the host overhaul under normal circumstances, and the comprehensive technical performance of the qualified host overhaul under normal circumstances and the new host is very similar!
To sum up, it can be seen that the normal overhaul work of the main engine is not only the basic requirements of equipment maintenance, but also the normal equipment maintenance of the enterprise control
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