How do you think the air compressor is oil-free or oil-free?

To distinguish whether the air compressor is micro-oil or oil-free, it can be found from working principle, structural features, lubrication methods, application scenarios, maintenance costs and certification standards six dimensions of comprehensive judgment. The following is a specific analysis:

1. working principle and structural characteristics

1. oil-free air compressor
   • core Principles: Through mechanical seal, ceramic coating or water lubrication and other technologies, completely avoid the contact between lubricating oil and the compression cavity, and realize oil-free compression.
   • Structural features:
     • rotor Material: Use ceramic, carbon fiber and other wear-resistant materials to reduce friction loss.
     • Seal Design: Equipped with double sealing system (such as gas seal + mechanical seal) to prevent external oil from entering the compression chamber.
     • Cooling mode: Mostly air-cooled or water-cooled, without oil cooling system.
   • TYPICAL TYPE: Oil-free screw air compressor, oil-free scroll air compressor, water-lubricated oil-free air compressor.
2. Micro-oil air compressor
   • core Principles: During the compression process, the lubricating oil participates in cooling, sealing and lubrication, but the oil content is reduced to a very low level (usually ≤ 0.1 mg/m & sup3;) through a multi-stage filtration system.
   • Structural features:
     • rotor Material: Ordinary metal material, relying on lubricating oil to reduce wear.
     • Lubrication system: Equipped with independent lubricating oil circulation system, including oil pump, oil cooler, oil filter, etc.
     • Post-processing equipment: Need to configure the coagulation filter, activated carbon adsorption tank, etc., to further remove the oil.
   • TYPICAL TYPE micro-oil screw air compressor, micro-oil piston air compressor.

2. Lubrication Mode and Oil Control

1. oil-free air compressor
   • lubrication method: No need for lubricating oil at all, or only use a small amount of grease in non-compression areas such as bearings (without entering the compression chamber).
   • Oil control compressed air is directly discharged, and the oil content is 0 (theoretical value). The actual detection may have trace oil due to seal leakage (but it is far lower than the micro-oil standard).
2. Micro-oil air compressor
   • lubrication method: The lubricating oil directly participates in the compression process, cools the rotor through oil injection or oil dripping and forms an oil film seal.
   • Oil control:
     • primary filtration: The oil core (oil separator) initially separates the oil, and the efficiency can reach 99.9%.
     • Secondary filtration: The coalescing filter further removes tiny oil droplets with an efficiency of 99.99%.
     • three-stage filtration: Activated carbon adsorption tank adsorbs oil vapor to ensure oil content ≤ 0.1 mg/m & sup3;.

3. application scenarios and industry standards

1. oil-free air compressor
   • application Scenarios: Medicine, food, electronics, semiconductors and other industries that require extremely high oil content, such as operating room ventilator gas supply, chip manufacturing, drug packaging, etc.
   • Industry Standard: ISO 8573-1 Class 0 (oil content ≤ 0.01 mg/m & sup3;) or Class 1 (oil content ≤ 0.01 mg/m & sup3;) is required.
2. Micro-oil air compressor
   • application Scenarios: Ordinary industrial scenarios, such as pneumatic tools, spraying, textiles, chemicals, etc., do not have strict requirements on oil content.
   • Industry Standard: ISO 8573-1 Class 2 (oil content ≤ 1 mg/m & sup3;) or Class 3 (oil content ≤ 5 mg/m & sup3;) is required.

4. maintenance costs and operational complexity

1. oil-free air compressor
   • maintenance costs:
     • the initial investment is high (due to the use of special materials and sealing technology).
     • Low long-term operating costs (no need to replace lubricants, oil core and other consumables).
   • operation complexity:
     • simple structure, low failure rate, long maintenance cycle (usually every 2000-4000 hours maintenance).
     • Seal wear needs to be checked regularly.
2. Micro-oil air compressor
   • maintenance costs:
     • low initial investment (low cost of common metal materials and lubrication systems).
     • Long-term operation cost is high (need to regularly replace the lubricating oil, oil core, oil filter and other consumables).
   • operation complexity:
     • the structure is complex, the failure rate is high, and the maintenance cycle is short (usually every 500-1000 hours).
     • Oil level, oil temperature and oil quality shall be monitored to prevent oil pollution.

5. intuitive judgment method

1. view product identification
   • oil-free air compressors are usually clearly marked with "Oil-Free" (oil-free) or "Class 0" on the nameplate or instructions ".
   • Micro-oil air compressors may be marked with "Oil-Injected" (oil injection) or "Micro-Oil" (micro-oil).
2. Observe the exhaust port
   • the oil-free air compressor has no oil mist or oil drops at the exhaust port, and the compressed air is clear and transparent.
   • There may be a trace of oil mist at the exhaust port of the micro-oil air compressor (to be observed after the post-treatment equipment).
3. Check the lubrication system
   • oil-free air compressor without independent lubricating oil circulation system (such as oil pump, oil cooler).
   • The micro-oil air compressor is equipped with a complete lubrication system, including oil tank, oil pipe, oil filter, etc.