Air compressor failure shutdown may be caused by a variety of reasons, the following from mechanical, electrical, thermal management, pressure control four categories to analyze, and provide diagnosis and solution ideas:
common fault causes and phenomena of 1.
1. Mechanical failure
- phenomenon: Shut down after abnormal noise and severe vibration of the main engine.
- Reason:
- bearing/screw wear: Insufficient lubricating oil or impurities cause lubrication failure.
- Piston stuck: foreign matter enters the cylinder or the piston ring is worn.
- Diagnosis: Dismantling inspection found that metal chips and lubricating oil turned black.
2. Electrical fault
- phenomenon: Control panel alarm, motor overheat shutdown.
- Reason:
- winding short circuit: motor insulation aging or overload.
- Controller failure: circuit board damp or component damage.
- Diagnosis: The multimeter detects abnormal winding resistance, and the control screen displays an error code.
3. Thermal management failure
- phenomenon: Automatic shutdown after exhaust temperature> 105 ℃.
- Reason:
- cooler blockage: The accumulation of dust and dirt leads to a decrease in heat dissipation efficiency.
- Oil deterioration: lubricating oil emulsification or coking, lubricating performance decline.
- Diagnosis: Infrared thermometer detects abnormal oil temperature/exhaust temperature.
4. Abnormal pressure control
- phenomenon: The pressure relay stops frequently.
- Reason:
- air leakage: the seal is aged or the pipe joint is loose.
- Pressure setting error: sensor drift or controller parameter error.
- Diagnosis apply soapy water to detect the air leakage point and calibrate the pressure gauge.
2. rapid processing flow
- emergency Response
- disconnect the power supply to avoid secondary damage.
- Record fault code/pre-shutdown pressure/temperature data.
- Grading investigation
- primary Inspection:
- supply voltage (deviation shall be <± 5%).
- Lubricating oil quantity (1/3-2/3 of oil level mirror).
- Air filter (pressure difference> 0.05MPa to be replaced).
- Depth diagnosis:
- motor insulation test (resistance> 1MΩ is normal).
- Infrared thermal imaging detects the temperature distribution.
- Vibration spectrum analysis (bearing failure frequency> 1kHz).
- Recovery measures
- temporary recovery:
- clean the cooler (compressed air blowback or water washing).
- Change the lubricating oil (drain the old oil completely).
- Permanent Repair:
- replace worn parts (bearings/studs/seals).
- Upgrade the cooling system (add cooling fan or water cooling kit).
3. prevention strategy
- oil Management regularly check the acid value (should be <2mgKOH/g), viscosity (deviation <10%).
- intelligent monitoring: Install the vibration sensor and temperature sensor, and set the warning threshold to 1.2 times the normal operating value.
- Environment adaptation: Pre-filtration device is installed in dust environment (filtration accuracy ≤ 1μm).
Typical lessons: A factory neglected to replace lubricating oil (3000 hours overdue), resulting in coking and blocking of the main engine, and the maintenance cost reached 45% of the equipment value. It is recommended to develop Air Compressor Health File to record the change trend of key parameters and realize preventive maintenance.
