Screw air compressor maintenance requirements

The maintenance of screw air compressor should follow "Three-level maintenance system"(daily, monthly, annual), combined with the use of time, environmental parameters and sensor data to develop a plan. The following are detailed requirements:

daily maintenance of 1. (daily/per shift)

1. oil level check
   • observe the oil sight mirror after shutdown, and the oil level shall be in the green area (oil shall be replenished if it is lower than the lower limit).
   • Attention: The oil supplement shall be consistent with the type of oil in use, and mixing is prohibited.
2. Condensate water discharge
   • open the drain valve at the bottom of the air tank and drain it until no liquid water flows out (increase the frequency in winter).
3. Leak Detection
   • check whether there is oil leakage at the pipe joint and oil seal. If any leakage is found, stop the machine immediately.
4. Control Panel Monitoring
   • record the exhaust temperature, pressure, and current parameters, and compare historical data to identify abnormalities.

2. monthly maintenance (every 500-800 hours)

1. air Filter Element Replacement
   • pressure difference> 0.05MPa or use time up to 2000 hours (harsh environment shortened to 500 hours).
   • Installation attention: The sealing surface of the filter element should be coated with silicone grease to prevent air short circuit.
2. Cooling system cleaning
   • water cooler: clean the scale of the cooler (it is recommended to pickling once a year).
   • Air cooler: reverse purge the heat sink with compressed air (pressure ≤ 0.3MPa).
3. Inspection of transmission components
   • belt drive model: adjust the belt tension (deflection 10-15mm).
   • Coupling model: check whether the elastic pad is cracked.

3. annual maintenance (every 2000-4000 hours)

1. lubricating oil and filter element replacement
   • oil change steps:
     1. preheat air compressor to operating temperature
     2. drain the old oil below the centerline of the oil sight glass.
     3. Add new oil to the upper limit of oil level
     4. run for 5 minutes and then discharge again, repeat 2 times
   • oil selection: The life of synthetic oil is 50% longer than that of mineral oil (ISO VG68 recommended).
2. Oil-gas separator (oil core) inspection
   • when the oil content of the outlet is more than 3ppm, it needs to be replaced (use the oil detector to detect).
   • life extension: Add pre-filter (filtering accuracy ≤ 1μm).
3. Main engine overhaul
   • check bearing clearance (axial ≤ 0.25mm, radial ≤ 0.08mm)
   • measure the gap between the male and female rotors (standard value 0.18-0.22mm)
   • replace worn bearings and seals

4. Sensor Calibration

• temperature sensor: Calibrate once every 2 years (error> 2 ℃ to be adjusted)
• pressure sensor: Compare with standard pressure gauge every year (error> ± 0.02MPa requires maintenance)

5. fault warning processing

it is recommended to adopt the intelligent management system of air compressor to realize the functions of maintenance warning and fault self-diagnosis. For key equipment, it is recommended to sign the original factory maintenance agreement to ensure the matching of spare parts and maintenance quality.