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Double-stage Permanent Magnet Variable Frequency Screw Air Compressor
1. Product Overview
This compressor integrates double-stage compression, high-efficiency permanent magnet synchronous motor and variable frequency drive technology. It reaches super IE5 ultra-premium energy efficiency standard, featuring outstanding energy saving, stable air supply, low noise, long service life and intelligent operation. It is widely used in precision manufacturing, chemical industry, textile, mining, food & pharmaceutical and other industrial fields with long continuous operation and fluctuating air consumption.
2. Working Principle
Atmospheric air is filtered and sent to the first-stage compression chamber for low-pressure compression. After inter-stage forced cooling, air enters the second-stage compression chamber for secondary high-pressure compression. The whole process approaches isothermal compression to reduce power consumption greatly. Equipped with dedicated VFD system, the unit adjusts motor speed steplessly according to actual air demand, eliminates no-load power loss and maintains constant air pressure.
3. Core Components & Advantages
3.1 Double-stage Screw Airend
Adopts high-precision asymmetric rotor profile with low rotating speed. Two-stage equal pressure ratio design effectively reduces internal leakage and compression heat. Integral direct drive structure realizes 100% transmission efficiency, no belt or coupling loss. Heavy-duty imported bearings ensure stable operation and long service life.
3.2 Rare-earth Permanent Magnet Motor
Ultra IE5 energy efficiency grade, motor efficiency up to 95%~96%. Brushless structure avoids excitation loss and wear parts. Soft start with low inrush current protects power grid. It keeps high efficiency even under low load and high temperature working conditions.
3.3 Intelligent VFD Control System
Real-time monitoring of pressure, temperature, current and running status. Air pressure fluctuation controlled within ±0.01 bar, suitable for high-precision production. It supports 20%~100% stepless speed regulation, remote monitoring, fault alarm and multi-unit linkage operation. Simple operation and unattended running are available.
3.4 High-efficiency Cooling & Lubrication System
Combined inter-stage oil cooling and air cooling system ensures stable operation under ambient temperature up to 45℃. Discharge temperature is strictly controlled. Three-stage oil-gas separation makes residual oil content ≤3 ppm, delivering clean compressed air. High-grade lubricant extends maintenance cycle.
4. Key Strengths
Super Energy Saving: Double-stage compression + PM motor + VFD technology saves 30%~50% power compared with traditional fixed-speed compressors, 10%~15% more energy-efficient than single-stage VFD models. Investment can be recovered by electricity savings within 1~3 years.
Stable Air Supply: Precise constant pressure improves product yield for precision processing.
Low Noise & Vibration: Optimized structure keeps noise at 65~75 dB(A), creating a better working environment.
High Reliability: Low wear design, fewer vulnerable parts, long service life and low maintenance cost.
Wide Adaptability: Works well in high temperature, high dust and other harsh working conditions.
5. Main Technical Parameters
Power Range: 15kW ~ 355kW
Rated Pressure: 0.7/0.8/1.0/1.3 MPa (customizable)
Speed Regulation Range: 20% ~ 100%
Noise Level: 65 ~ 75 dB(A)
Residual Oil Content: ≤ 3 ppm
Working Ambient Temperature: 0℃ ~ 45℃
6. Application Fields
Ideal for large and medium-sized factories with long-time continuous operation and variable air consumption, including auto parts, electronics, machinery, chemical, textile, mining, food, pharmaceutical and new energy industries.
7. Maintenance
Daily inspection for oil level, pressure and temperature. Standard maintenance cycles: 500 hours for filter elements replacement; 2000 hours for lubricant and separator core replacement; 8000 hours for comprehensive inspection. The intelligent system will automatically remind regular maintenance to avoid unexpected shutdown.
Conclusion
As an upgraded high-efficiency air supply solution, the double-stage permanent magnet VFD screw compressor cuts overall operating cost significantly. With excellent performance and high cost performance, it is the preferred equipment for modern industrial air compression stations.
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