1. Reciprocating (Piston) Air Compressors
How they work
Air is compressed by a piston moving up and down inside a cylinder.
Types
-
Single-stage
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Two-stage
Pros
-
Low initial cost
-
Simple structure
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Easy maintenance
-
Good for intermittent use
Cons
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Noisy
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Higher vibration
-
Not suitable for continuous operation
Typical Applications
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Workshops
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Garages
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Small factories
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Spray painting (low volume)
2. Rotary Screw Air Compressors
How they work
Two rotating screws compress air continuously.
Pros
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Continuous air supply
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Low noise
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High efficiency
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Long service life
Cons
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Higher price than piston compressors
-
Professional maintenance required
Typical Applications
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Manufacturing plants
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PET bottle blowing lines
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CNC machines
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Continuous industrial use
3. Scroll Air Compressors
How they work
Two spiral-shaped scrolls compress air smoothly.
Pros
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Very quiet
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Oil-free
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Compact size
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Low vibration
Cons
-
Limited capacity
-
Higher cost per CFM
Typical Applications
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Medical equipment
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Dental clinics
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Laboratories
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Electronics industry
4. Centrifugal Air Compressors
How they work
High-speed rotating impellers increase air velocity and pressure.
Pros
-
Large air volume
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High efficiency at large scale
-
Reliable for continuous operation
Cons
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Very expensive
-
Large size
-
Complex system
Typical Applications
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Steel plants
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Chemical plants
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Power stations
-
Large industrial systems
5. Axial Air Compressors
How they work
Air flows parallel to the compressor shaft through multiple rotating blades.
Pros
-
Extremely high airflow
-
Compact for large volumes
Cons
-
Complex design
-
Very expensive
-
Limited pressure increase per stage
Typical Applications
-
Aircraft engines
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Gas turbines
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Power generation
6. Diaphragm Air Compressors
How they work
A flexible diaphragm compresses air without oil contact.
Pros
-
Oil-free
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High purity air
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Good for corrosive gases
Cons
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Low capacity
-
Higher cost
Typical Applications
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Pharmaceutical industry
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Food processing
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Chemical handling
7. Oil-Free vs Oil-Lubricated (Important Classification)
Oil-Lubricated Compressors
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Longer lifespan
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Higher efficiency
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Requires oil maintenance
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Air contains oil mist
Oil-Free Compressors
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Clean air
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Higher cost
-
Shorter service life
-
Lower efficiency
8. Portable vs Stationary Compressors
Portable
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Small, movable
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Construction sites
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Field repair
Stationary
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Fixed installation
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Industrial production lines
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Higher capacity
9. Special Application Compressors
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High-pressure compressors (PET bottle blowing)
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Low-pressure blowers (aeration, wastewater)
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Booster compressors (increase existing air pressure)
Quick Selection Guide
| Requirement | Recommended Type |
|---|---|
| Low cost, small workshop | Piston |
| Continuous factory use | Rotary screw |
| Quiet, clean air | Scroll |
| Large industrial airflow | Centrifugal |
| Medical / food | Oil-free diaphragm |
| PET blowing | Screw + booster |
