@Air Compressor
2025-03-27
How to lubricate oil-free dry screw air compressor
Oil-free dry screw air compressor achieves oil-free compression through innovative lubrication technology. Its core lubrication methods, material selection and system characteristics are as follows:
1. Lubricating method
- Fluoride Lubricant (PTFE)
- principle: Circularly spray liquid fluoride lubricant through the pipeline to form a uniform lubricating film on the surface of the compression chamber to reduce direct contact between metals.
- advantages：
- Completely oil-free, preventing compressed gas from being contaminated, and complying with Class 0 oil-free certification standards.
- PTFE has excellent chemical inertness and biocompatibility, and is suitable for use in sensitive industries such as medicine and food.
- Lubricating films also reduce noise and vibration and extend equipment life.
- Coating lubrication (dry coating lubrication)
- principle: Apply solid lubricants (such as PTFE or MoS ˇ coating) on the surfaces of key components such as screw rotors and bearings.
- advantages：
- There is no need to add additional lubricants, simplifying the maintenance process.
- The coating provides long-term lubrication, reduces friction coefficient and improves energy efficiency.
- Ensure that the compression chamber is absolutely dry and suitable for low-temperature or oil-free processes.
2. Characteristics of lubricating materials
| material type | core ingredients | performance advantages | applicable scenarios |
|---|---|---|---|
| Fluoride lubricants | PTFE (polytetrafluoroethylene) | High and low temperature resistance, chemical inertness, low friction coefficient | Pharmaceutical clean room, food packaging line |
| coating lubrication | PTFE/MoS₂ | High wear resistance, dry lubrication, long-term stability | Electronic component manufacturing, laboratory gas supply |
3. Lubricating system design
- Fluoride lubrication system
- cyclic spraying: Lubricant is pumped to the compression chamber, discharged with the air flow, and recovered through the oil-water separator to achieve closed-loop circulation.
- intelligent control: Equipped with monitoring sensors to adjust the amount of lubricant in real time to avoid excessive or insufficient.
- Coating lubrication system
- process optimization: Use physical vapor deposition (PVD) or electroless coating technology to ensure uniform and dense coating.
- life management: Through operating data analysis, predict coating wear trends and plan replacement.
4. Comparison and maintenance suggestions
| indicators | fluoride lubrication | coating lubrication |
|---|---|---|
| maintenance cycle | Check the amount of lubricant every 5000-8000 hours | Inspect coating wear every 20000 hours |
| cost | Low initial investment and long-term need to replenish lubricants | High initial coating process costs and low later maintenance |
| adaptability | Suitable for variable working conditions and high humidity environments | Suitable for stable operating conditions and low temperature environments |
| Environmental Protection | PTFE is biodegradable and has no environmental risks | No lubricant consumption, zero emissions |
Selection suggestions：
- preferably selectedfluoride lubrication: If you need to flexibly adjust the lubrication amount or the operating environment is humid.
- preferably selectedcoating lubrication: If you pursue extreme dryness or long-term maintenance free.
maintenance points：
- Fluoride lubrication requires regular testing of the lubricating film thickness to avoid excessive dilution.
- Coating lubrication requires monitoring temperature changes to prevent thermal damage to the coating.