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06. What are The Differences Between Twin-screw Air Compressors And Single-screw Air Compressors?

  1. Force balance:
    • Single-screw air compressor: The forces experienced by the screw are automatically balanced radially and axially. The star wheel teeth bear the gas forces and require sufficient strength and stiffness.
    • Twin-screw air compressor: The screw rotors bear larger radial and axial gas forces, requiring the screws to have sufficient strength and stiffness.
  2. Manufacturing cost:
    • Single-screw air compressor: The screw and star wheel bearings can use ordinary bearings, resulting in lower manufacturing costs.
    • Twin-screw air compressor: Due to the higher loads on the two screw rotors, higher precision bearings are required, leading to higher manufacturing costs.
  3. Reliability:
    • Single-screw air compressor: The star wheel is a vulnerable component that requires regular replacement, in addition to high material requirements.
    • Twin-screw air compressor: There are no vulnerable parts in the twin-screw air compressor, and it can operate without failures for 40,000 to 80,000 hours (with regular major overhauls).
  4. Efficiency:
    • With increasing operating time, the wear of the star wheel in single-screw air compressors can lead to reduced airflow and decreased efficiency.
  5. Noise and vibration:
    • The noise and vibration levels of single-screw and twin-screw air compressors are generally similar.
  6. Processing equipment:
    • Single-screw air compressors lack mature specialized processing equipment, which may result in less stable product performance. Twin-screw air compressors have dedicated screw milling and grinding machines, ensuring stable product performance.
  7. Operation and maintenance:
    • The daily operation and maintenance of single-screw and twin-screw air compressors are generally similar.
  8. Applicability:
    • Single-screw air compressors are suitable for applications requiring high discharge pressures.
    • Twin-screw air compressors, due to rotor stiffness and bearing load limitations, are typically limited to medium and low pressure ranges, with discharge pressures generally not exceeding 4.5 MPa.

From a structural standpoint, the manufacturing process of twin-screw compressors is more complex than that of single-screw compressors. In a new machine state, the efficiency of single-screw and twin-screw compressors is similar.

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