Oil-free air compressor according lubrication method and working principle it can be divided into five categories, and its technical characteristics and application scenarios are significantly different. The following is the specific classification and analysis:
1. water-lubricated oil-free air compressor
- principle pure water is used as the lubricating medium, and the air is compressed by the rotation of the screw and the star wheel.
- Advantage:
- high cost performance: No oil and gas separation device is required, and the maintenance cost is low.
- Environmental protection zero oil pollution, in line with the pharmaceutical, food industry clean standards.
- Application pharmaceutical clean room, food packaging, laboratory gas supply, electronics, semiconductors, chemicals, etc.
2. dry grinding oil-free air compressor (resin lubrication)
- principle: The surface of the screw is sprayed with a wear-resistant coating such as Teflon to reduce direct contact.
- Features:
- high reliability: No risk of lubricating oil oxidation, life extension of 30-50%.
- high cost: Large initial investment, suitable for enterprises with sufficient budget.
- Applicable Scenarios: Semiconductor manufacturing, precision instrument calibration.
3. reciprocating oil-free air compressor (piston type)
- principle: Piston reciprocating compressed gas, using self-lubricating materials.
- Advantage:
- simple structure: Easy maintenance, strong versatility of accessories.
- Low cost suitable for small and micro businesses.
- Limitations large vibration and high noise (usually> 85dB).
- Typical applications: Small dental clinics, research laboratories.
4. scroll oil-free air compressor
- principle: The dynamic vortex disk revolves around the static vortex disk to form a closed compression chamber.
- Features:
- silent operation noise as low as 60dB, suitable for hospital environment.
- Small displacement: Exhaust volume is usually <1m & sup3;/min.
- Field of application: Medical imaging equipment, micro-spray robots.
5. centrifugal oil-free air compressor
- principle: High-speed impeller centrifugal pressurization, non-contact compression.
- Advantage:
- atmospheric volume: Single stage compression up to 100m & sup3;/min.
- Low maintenance: No wearing parts, MTBF>50,000 hours.
- Challenge: Need to support the cooling system, high energy consumption.
- Main application air separation unit, large fermentation tank gas supply.
Selection recommendations
- high demand for cleanliness: Select water lubrication or dry grinding type (pay attention to resin compatibility).
- Noise sensitive scene: Priority vortex or centrifugal.
- Limited budget reciprocating is suitable for short-term transition, but noise reduction measures should be reserved.
Industry case: An electronics factory due to compressed air oil led to a decline in product yield, change to water-lubricated oil-free air compressor, the non-yield rate from 3% to 0.5, equipment investment recovery period of only 18 months.
