Poor lubricating oil quality will have a negative impact on air compressors in many aspects, involving equipment performance, service life, operational stability, and maintenance costs. The following is the specific impact and analysis:
1. lubrication performance decreases, accelerating mechanical wear
- increased friction due to insufficient lubrication
high-quality lubricating oil can form a stable oil film between moving parts and reduce direct metal contact. Insufficient lubricating oil viscosity, poor abrasion resistance or low oil film strength will result in: - bearing wear rolling bearings or sliding bearings pitting, peeling, or even stuck due to insufficient lubrication.
- Gear damage: Gluing and tooth breakage of gear meshing surface due to lack of lubrication.
- Rotor/piston wear: The friction between the rotors of the screw air compressor or the piston and the cylinder wall increases, resulting in increased clearance and reduced efficiency.
- Case after using inferior lubricating oil in a chemical plant, the life of the air compressor bearing was shortened from 20000 hours to 5000 hours, requiring frequent replacement.
2. sealing performance deteriorates, causing leakage
- accelerated aging of seals
seals (e. g. O-rings, gaskets) deteriorate rapidly due to insufficient additives (e. g., antioxidants, corrosion inhibitors) in the lubricating oil: - high temperature oxidation: Inferior oil is easy to decompose at high temperature, resulting in acidic substances that corrode sealing materials.
- chemical erosion imbalance of impurities or additives in the oil causes the seal to expand, shrink or crack.
- Consequences of leakage:
- gas leakage: Compressed air leakage leads to increased energy consumption (about 15%-20% energy loss).
- Lubricating oil leakage: Pollution of the environment, while the need for frequent oil replenishment, increase operating costs.
The 3. cooling effect is deteriorated and the system is overheated
- thermal conductivity decrease
high-quality lubricants need to have good thermal conductivity to help heat dissipation. Poor oil may be due: - viscosity too high: Poor fluidity, unable to take away heat in time.
- carbon deposition generation: Decomposition at high temperature produces carbon deposits, which adhere to the surface of the cooler and reduce heat exchange efficiency.
- Overheat hazard:
- oil temperature too high: Accelerate oil oxidation and shorten service life.
- Motor overheating: May trigger the shutdown of the protection device, affecting the continuity of production.
- Material deformation: Long-term high temperature causes thermal fatigue of metal parts, causing cracks or deformation.
4. corrosion and deposition problems increase
- formation of acidic substances
poor quality lubricating oil has poor oxidation resistance and is easy to react with oxygen and moisture in the air to generate acidic substances, resulting in: - metal corrosion: Cylinder, oil circuit and other components rust, increase the risk of leakage.
- Oil circuit blocked: Acidic substances combine with impurities to form deposits, blocking oil filters, fuel injectors, etc.
- Case: The air compressor of a food factory uses lubricating oil with excessive sulfur content, which leads to serious corrosion of the oil system, and the maintenance cost is as high as tens of thousands of yuan.
Reduced 5. energy efficiency and increased operating costs
increased internal leakage
the poor quality of lubricating oil leads to the decrease of sealing performance, and the high-pressure gas in the compression chamber leaks to the low-pressure side, which requires more electric energy to maintain the pressure.
Increased friction loss
after the mechanical wear intensifies, the air compressor needs to overcome greater resistance to run, and the energy consumption increases significantly.
Data comparison:
when using high-quality lubricating oil, the energy efficiency ratio (specific power) of the air compressor can reach 5.5kW/(m & sup3;/min); However, inferior oil may cause the energy efficiency ratio to rise to 6.5kW/(m & sup3;/min), increasing annual power consumption by about 18%.
6. Maintenance Frequency and Cost Surge
shortened parts replacement cycle
bearings, gears, seals and other wearing parts need to be replaced in advance due to poor lubrication, and maintenance costs increase by 30%-50%.
Sudden failure risk
inferior oil may cause serious faults such as sudden jam and cylinder explosion of air compressor in operation, resulting in production line shutdown loss.
Case: Due to the use of inferior lubricating oil in an automobile factory, the number of air compressor failures per month increased from 1 to 3, and the annual maintenance cost increased by 200000 yuan.
7. environmental and compliance risks
excessive emission
insufficient combustion or leakage of inferior oil may lead to excessive particulate matter and volatile organic compounds (VOCs) in exhaust gas, which violates environmental protection regulations.
Waste disposal costs
the inferior lubricating oil under replacement is hazardous waste and needs to be handled by a professional organization, which increases the compliance cost.
Solutions and Suggestions
selection of compliant lubricants
according to the type of air compressor (e. g. screw type, piston type) and working conditions (temperature, pressure), the lubricating oil conforming to ISO 6743-4A or DIN 51506 is selected.
Regular oil testing
through oil sample analysis (such as viscosity, acid value, moisture, metal particle content) monitoring oil status, early warning of replacement needs.
Establish a maintenance plan
develop a lubricating oil replacement cycle (usually 2000-8000 hours), and record the use of oil, the formation of maintenance files.
Training of operators
strengthen equipment maintenance training to avoid accelerated oil deterioration due to improper operation (such as mixed oil, over-temperature operation).
