During the operation of a diesel screw air compressor, excessively high temperatures are one of the common faults, which may cause the equipment to stop, efficiency to decline, and even damage to key components. The possible causes and solutions for high temperatures are as follows:
1. Main reasons for high temperatures
1.1 Cooling system failure
- Clogged radiator: Dust and oil contamination affect the cooling efficiency, causing the exhaust temperature to rise (normal exhaust temperature should be ≤ 100℃).
- Damaged cooling fan: Insufficient or non-functional rotation speed of the fan, unable to effectively cool.
- Insufficient cooling water or poor water quality: For water-cooled air compressors, if the water volume is insufficient or the water quality is hard and caked, the cooling effect will be reduced.
1.2 Lubricant issues
- Insufficient oil: Oil level below the standard line (usually at 1/2 to 2/3 of the sight glass), reducing lubrication and cooling performance.
- Degraded oil quality: Oil beyond the usage period (generally 2000 to 4000 hours) or mixed with impurities, reducing viscosity.
1.3 Environmental and operating conditions
- Poor ventilation: Small installation space or environmental temperature exceeding 40℃, preventing heat from dissipating in time.
- Excessive load: Continuous overpressure operation (such as exhaust pressure consistently > rated pressure by 10% or more).
1.4. Mechanical component wear
- Bearing or rotor wear: Increased friction leads to local overheating.
- Temperature control valve failure: Valve core stuck, preventing lubricating oil from entering the cooler (normal opening temperature is approximately 70-80℃).
2. Maintenance suggestions
2.1 Check and clean the cooling system
- Regularly use compressed air or soft brushes to clean the radiator fins (suggested every 500 hours).
- For water-cooled models, check the pump flow rate (reference value: ≥ 3 m³/h) and clean the waterway scale.
2.2 Standardize lubricant management
- Use the original manufacturer's specified type of lubricant (such as ISO VG 46 or 68), replace every 2000 hours or every half a year.
- Replace the oil filter at the same time (blockage pressure difference > 1.5 bar requires immediate replacement).
2.3 Optimize operating environment
- Ensure a space of at least 1 meter around the equipment, and install ventilation fans if necessary. Install temperature sensors for real-time monitoring (the alarm temperature is recommended to be set at 105℃).
2.4. Regular maintenance of mechanical components
- Conduct annual checks on bearing clearance (standard value: 0.02 - 0.05mm). Abnormal wear requires replacement.
- Test the sensitivity of the temperature control valve. If necessary, disassemble and clean or replace it.
Additional suggestions: For air compressors that frequently trigger high-temperature alarms, an additional heat recovery system can be installed to reduce temperature and improve energy efficiency. If the above measures are ineffective, it is recommended to contact professional maintenance personnel to check for circuit or control system faults.
