@air
2025-04-21
The difference between oilless screw air compressor and oilless screw machine
The core difference between oilless screw air compressors and oilless screw air compressors is thatlubrication methodandgas cleanliness, the specific comparison is as follows:
1. Lubrication principle
| characteristics | oilless screw machine | Oiled screw machine |
|---|---|---|
| lubricating medium | Special coatings/ceramic materials/water (no need for lubricants) | Mineral oil/synthetic oil |
| Friction pair treatment | The surface of the screw is sprayed with DLC (diamond-like coating) | Relying on oil films to form lubricating layers |
| bearing lubrication | Grease lubrication (independent lubrication system) | Splash lubrication (shares oil system with compression chamber) |
2. Gas quality comparison
| indicators | oilless screw machine | Oiled screw machine |
|---|---|---|
| oil content | ≤0.003ppm (complies with ISO 8573-1 Class 0) | Multi-level filtration is required to meet Class 1 standard |
| particulate matter | No oil carbon residue | May contain sludge/carbon particles |
| applicability | Clean areas such as medical/electronics/food | General industrial gas (requires post-treatment) |
3. Performance and maintenance
| dimension | oilless screw machine | Oiled screw machine |
|---|---|---|
| efficiency | Reduced efficiency by 5%-8% due to increased friction | Higher efficiency (oil lubrication reduces internal leakage) |
| noise | Noise reduction by 3-5dB (no oil agitation) | High noise (oil flow creates turbulence) |
| maintenance cycle | Coating life approximately 20000 hours/water * | Oil change cycle 4000-8000 hours |
| cost | Initial investment 30%-50% higher | High cost performance, suitable for large-scale applications |
4. Technological development trends
- oil-free：
- Breakthroughs in new materials (such as graphene coatings)
- Magnetic levitation bearing technology (to achieve true zero-contact)
- Suitable for new energy fields such as hydrogen energy
- oil machine：
- Intelligent lubrication system (oil supply on demand)
- Oil and gas separation efficiency increased to 99.99%
- Modular design (easy to expand capacity)
Selection suggestions：
- Priority is given to oil-free oil: gas points contain precision sensors, contact with food/drugs, and export to the EU CE certification requirements
- Optional oil machine: centralized gas supply from the factory, supporting drying and filtration system, and non-critical process gas
note: All oil engines need to be equipped with three-level filtration (pre-filtration + precision filtration + activated carbon adsorption) and regular detection of oil content to avoid damage to the equipment caused by lubricating oil aerosols.
