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02. How are Air Compressors Classified?

Air compressors can be classified in various ways based on factors such as their working principle, structural form, and performance parameters. Here are some common classification methods:

  1. Classification based on the working principle:
    • Positive Displacement Air Compressors: These compressors work by reducing the volume of air to increase its pressure. Examples include reciprocating compressors (piston, diaphragm) and rotary compressors (sliding vane, screw).
    • Dynamic Air Compressors: These compressors use rotating elements to accelerate and convert the kinetic energy of air into pressure energy. Examples include centrifugal compressors, axial compressors, and mixed-flow compressors.
  2. Classification based on the output pressure:
    • Low-Pressure Air Compressors: Up to 0.2-1.0 MPa.
    • Medium-Pressure Air Compressors: 1.0-10 MPa.
    • High-Pressure Air Compressors: 10-100 MPa.
    • Ultra-High-Pressure Air Compressors: Above 100 MPa.
  3. Classification based on the output flow rate (displacement):
    • Micro and Small Air Compressors: Up to 1-10 m3/min.
    • Medium Air Compressors: 10-100 m3/min.
    • Large Air Compressors: Above 100 m3/min.
  4. Classification based on the cooling method:
    • Water-Cooled Air Compressors: These compressors use a water-based cooling system.
    • Air-Cooled Air Compressors: These compressors use fans for cooling.
  5. Classification based on the driving source:
    • Electric Motor-Driven Air Compressors.
    • Diesel Engine-Driven Air Compressors.
  6. Classification based on the lubrication method:
    • Oil-Free Air Compressors.
    • Oil-Lubricated Air Compressors: These can be further classified into splash lubrication and forced lubrication (with oil pump and lubricator).
  7. Classification based on the configuration:
    • Fixed Air Compressors: Can be with or without a foundation.
    • Mobile Air Compressors.
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