Fault prevention technology for head jamming of oil-injected screw air compressor

The common reasons for the stuck head of the air compressor mainly include the following aspects:

1. The bearings of the air compressor are aging and severely worn.

• The service life of the air compressor head is the service life of the bearings, and the bearings of the unit have an important impact on the service life of the air compressor head. With the long-term production and operation of the air compressor, the bearings of the head and the size of the air compressor will inevitably wear out, resulting in an increase in the axial movement value and radial movement value of the screw. This change will make the gap between the screw and the screw , The gap between the screw and the main engine shell and the front and rear end faces changes. This gap change is normal and allowable within the life of the bearing, and the air compressor air production attenuation and drive motor load increase are also normal and allowable. However, when the bearing wear and the fit clearance of the main engine exceed the allowable limit, the axial movement value and radial movement value of the screw will increase. If the gap between the front and rear end faces changes, a jamming failure of the machine head may occur.
• Precautionary measures: Regularly inspect and maintain the air compressor unit, and during the maintenance process, especially the bearings should be tested. Check the clearance of the bearing to see if there is shaking or wear. If abnormal conditions such as bearing shaking and wear are found, the bearing should be replaced in time.

 

 

2. Insufficient oil supply and low oil level during the operation of the air compressor will cause the machine head to be stuck due to lack of oil.

• Insufficient oil supply and low oil level of the air compressor unit, including untimely replacement or addition of lubricating oil, or blockage and leakage of oil passages, will cause the bearings at both ends of the screw rotor to lose lubrication during operation, resulting in serious wear of the bearings and making the male and female screws Friction stuck (locked) occurs.
• Preventive measures: Do a good job in the daily maintenance and regular maintenance of the unit, conduct daily inspections, check the oil level on time, and replenish lubricating oil in time to avoid lock-up of the machine head due to lack of oil.

3. The lubricating oil in the head of the air compressor is insufficient.

• When the screw air compressor is out of service for a long time, its internal parts, especially the oil in the machine head, will be insufficient. When the machine is started without paying attention, it will cause a momentary lack of oil and cause the machine head to be stuck.
• Preventive measures: For screw air compressor units that have been shut down for a long time, add a sufficient amount of oil to the machine head before starting up, and manually turn the machine several times before starting the air compressor unit.

4. Oil quality problem.

• Because the oil is not changed in time, or the oil quality is not good, there are too many impurities, the lubricating oil contains impurities, carbon deposits, coking, and rust spots; the use of inferior lubricating oil or extended use, the performance indicators of the lubricating oil will decline; mixed oil or oil Too dirty and other reasons lead to poor cooling and lubrication of the machine head, and oil deposits carbon make the rotor and the casing sintered together, which mostly occurs between the exhaust end face of the rotor and the casing or the outer circle of the rotor shaft and the inner hole of the casing, and it is easy to cause the main engine ( nose) stuck accident.
• Precautionary measures: use good quality air compressor special lubricating oil, perform maintenance in strict accordance with the air compressor lubricating oil replacement regulations, and regularly sample and analyze the unit lubricating oil to ensure the quality of the unit lubricating oil.

5. Foreign matter enters and gets stuck.

• When a foreign matter is sucked in from the air inlet, it is extremely easy to cause jamming.
• Preventive measures: Check and maintain the air filter regularly to ensure that the air source entering the air compressor is clean.

6. The unit is reversed and stuck.

• When the screw air compressor is reversed, the thrust generated by the compressed air will push the rotor to the exhaust end, causing the metal to sinter and get stuck. Therefore, it generally only occurs when the protection fails, or when the motor wiring is replaced or the switch is replaced.
• Precautionary measures: Regularly carry out the maintenance of the self-protection of the instruments and meters, and strictly follow the maintenance operating procedures to replace the motor wiring, replace the switch and other operations, so as to avoid the fault of the air compressor reversed and stuck due to the reversed connection.

 

Sollant Group-Professional Compressed Gas Solutions Provider