variable frequency twin screw rotary air compressor

two stage fixed speed twin screw rotary air compressor

The two-stage twin-screw air compressor is a high-efficiency and energy-saving industrial compressed air equipment, which adopts two-stage compression technology and twin-screw rotor structure to provide higher compression efficiency and lower energy consumption.

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Description

Compared with single-stage compressors, the two-stage fixed speed twin screw rotary air compressor reduces energy consumption by 10% to 15% at the same exhaust pressure. It also lowers internal compression ratios, cuts leakage and bearing load, and extends equipment life—making it ideal for demanding industrial environments.

Technical Parameters

  • Flow rate range: 3.4 to 72 m³/min
  • Pressure range: 0.7 to 1.2 Mpa
  • Power range: 22 to 400 kW
  • Driving mode: Frequency drive
  • Cooling mode: Air-cooled/Water-cooled (optional)

Features of Two Stage Fixed Speed Twin Screw Rotary Air Compressor

  1. High efficiency and energy saving:
    • Two-stage compression lowers energy consumption and improves gas delivery efficiency.
    • Optimized rotor profile reduces leakage and maximizes compression efficiency.
    • Complies with national energy efficiency standards for reduced long-term costs.
  2. Stable and reliable:
    • Lower compression ratio per stage allows lower operating temperature and longer component life.
    • Uses high-quality SKF or NSK bearings for stable long-term operation.
    • Advanced oil/gas separation ensures ultra-low oil content (≤3ppm) for high-quality air output.
  3. Convenient maintenance:
    • Modular design for easy maintenance and accessory replacement, reducing downtime.
    • Efficient oil separator and large air filter allow long intervals between maintenance and reduce costs.
  4. Flexible cooling mode:
    • Air-cooled or water-cooled options to suit different environments and ensure stable operation.

Compression Principle

The compressor employs a two-stage compression and twin-screw rotor structure, reducing each stage’s compression ratio and energy loss. The process includes:

  1. Air intake: Clean air enters the first-stage screw rotor, filling the rotor cavity.
  2. First stage compression: The air is compressed as the rotor turns, raising pressure and temperature. After compression, air is cooled in an intercooler.
  3. Second stage compression: Cooled air is further compressed in the second-stage rotor to the set pressure, with higher efficiency than single-stage designs.
  4. Exhaust and oil-air separation: Compressed air moves through the oil-air separator, reducing oil content to ≤3ppm, before entering storage or downstream equipment.

Application Areas

  • Metallurgy & Iron/Steel: Blast furnaces, continuous casting, blowing systems.
  • Machinery Manufacturing: CNC machines, automated lines, robot systems.
  • Automobile Manufacturing: Painting, welding, pneumatic tool operation.
  • Textile Industry: Air jet looms, airflow spinning equipment.
  • Electronics Industry: Clean air supply for precision components manufacturing.
  • Food & Medicine: Non-polluting compressed air for packaging, fermentation, aseptic transport, and more.
  • Petrochemical Industry: Chemical production lines, gas transport, and explosion-proof pneumatic equipment.