two stage variable frequency screw air compressor with pm

The permanent magnet frequency conversion two-stage screw air compressor is a highly energy-efficient industrial solution designed to provide a stable and reliable air supply for modern production environments. By combining a permanent magnet synchronous motor with advanced two-stage compression technology, this compressor reduces energy consumption and boosts operational efficiency, making it ideal for industries where energy savings and high air quality are essential.

Features of Two-Stage Variable Frequency Screw Air Compressor

1. High-efficiency two-stage compression system:
   • Custom two-stage screw mainframe optimizes the compression process, improves energy efficiency, and reduces energy loss compared to single-stage compressors.
   • Oil-injection cooling after each stage minimizes temperature, lowers power consumption, and ensures optimal suction conditions for the second stage.
   • Intermediate pressure setting reduces the compression ratio per stage, decreases gas leakage, and boosts volumetric and adiabatic efficiency—delivering around 15% higher overall energy efficiency.
2. Permanet magnet synchronous motor:
   • Fully enclosed oil-cooled IP65 motor offers high efficiency, excellent stability, and reliable dustproof/waterproof performance for harsh conditions.
   • Direct-drive coaxial design eliminates mechanical losses, ensuring quiet, efficient operation.
3. Intelligent control system:
   • Smart energy-saving controls monitor real-time conditions, optimize energy usage, and keep pressure fluctuation within ±0.01MPa.
   • Precise flow adjustment and constant pressure functions provide exhaust volume based on actual demand, minimizing energy waste.
   • Remote monitoring and auto fault alarm enable unattended continuous operation, reducing manual maintenance costs.

Working Principle

1. First-stage compression: Ambient air enters the first screw chamber, is compressed to an intermediate pressure, and is cooled by oil injection to reduce temperature and improve efficiency.
2. Intermediate cooling: The compressed air is further cooled by oil injection before entering the second stage, reducing the energy required for further compression.
3. Second-stage compression: Air is compressed to the set pressure in the second screw rotor, then passed through oil-gas separation for dry, clean output.
4. Frequency conversion adjustment: The system automatically adjusts motor speed to match real-time air demand, ensuring precise supply and extending system life.

Application Areas

• Manufacturing industry: Metal processing, food packaging, rubber and plastics—delivering high-quality compressed air for demanding tasks.
• Electronics industry: Clean, oil-free air supply for precision electronic equipment manufacturing.
• Automotive industry: Stable air support for spraying, welding, and assembly lines.
• Chemical and pharmaceutical industry: Provides a reliable, clean air source for production in line with strict industry standards.
• Textile and printing: Supports pneumatic equipment for efficient, continuous production.