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This is a screw air compressor with a rated power of 250 kW. Its core features are the integration of a permanent magnet synchronous motor, variable frequency drive technology, and a two-stage compression unit.
• Permanent magnet variable frequency drive: This refers to the use of a high-efficiency synchronous motor containing rare earth permanent magnets. The motor speed is adjusted in real time by a frequency converter to control the compressor's air output.
• Two-stage compression: This refers to the two-stage air compression process. After the first screw performs initial compression, the air is then fed into the second screw for further compression, ultimately reaching the desired pressure.
Product Parameters
| Two-stage PM VSD Screw Air Compressor | |||||||||
| Model | Air Delivery (m³min) | Power (kW/hp) | Noise dB(A) | Outlet diameter | Dimensions (mm) | Weight (kg) | |||
| 7 bar | 8 bar | 10 bar | 13 bar | L*W*H | |||||
| RK350APMII | 16.2-54.0 | 15.3-51.0 | 13.5-45.0 | 11.4-38.0 | 250/350 | 82 | DN100 | 3600*2200*2200 | 6000 |
| RK375APMII | 18.0-60.0 | 17.1-57.0 | 15.0-50.0 | 12.9-43.0 | 280/375 | 82 | DN125 | 3600*2200*2200 | 6800 |
| RK420APMI | 19.5-65.0 | 18.6-62.0 | 16.8-56.0 | 15.2-50.5 | 315/420 | 82 | DN125 | 4200*2300*2350 | 8000 |
| RK480APMII | 22.5-75.0 | 21.9-73.0 | 19.2-64.0 | 16.5-55.0 | 355/480 | 82 | DN150 | 4200*2200*2350 | 8500 |
| RK540APMII | 25.2-84.0 | 24.6-82.0 | 21.6-72.0 | 18.3-61.0 | 400/540 | 82 | DN150 | 4200*2200*2350 | 9800 |
Advantages and Features
Ultra-high energy efficiency, significant energy savings
◦ The permanent magnet motor's inherent efficiency reaches IE4/IE5 levels, 5-15% higher than conventional motors.
◦ Variable frequency control precisely matches output to gas demand, avoiding no-load waste. Energy savings can reach over 30%, especially in applications with large gas volume fluctuations.
◦ Two-stage compression reduces the compression ratio and internal leakage, lowering bearing loads and improving mechanical efficiency by approximately 10-15% compared to single-stage compression.
Excellent air supply stability:
◦ Variable frequency technology enables extremely precise air pressure control, achieving constant pressure supply with extremely small pressure fluctuations (e.g., ±0.01 bar), meeting the air supply requirements of high-end manufacturing.
High reliability and long life:
◦ The two-stage structure reduces load and temperature at each compression stage, resulting in less stress on bearings and rotors, reduced wear, and longer life for core components. 4. Smooth Startup, Minimum Power Grid Impact:
◦ The VFD enables soft starting, with a starting current lower than the rated current, thus avoiding the impact of direct starting on the power grid.
Low Noise and Vibration:
◦ Permanent magnet motors operate smoothly, with less noise and vibration than traditional asynchronous motors.
Application Industries
Due to its high power, high efficiency, and high stability, it is primarily used in large-scale industrial sectors with huge compressed air demands, requiring continuous and stable operation, and placing a strong emphasis on energy conservation. Examples include:
• Large-scale manufacturing industries: automotive, aerospace, and shipbuilding.
• Chemical and petrochemical industries: used as process air or instrument air.
• Mining and metallurgy: used to power large rock drills, pneumatic tools, and other equipment.
• Textiles and electronics: used in precision industries requiring a high-quality, stable air source.
• Centralized air supply stations: used to provide compressed air to entire industrial parks or large factories.
This is a screw air compressor with a rated power of 250 kW. Its core features are the integration of a permanent magnet synchronous motor, variable frequency drive technology, and a two-stage compression unit.
• Permanent magnet variable frequency drive: This refers to the use of a high-efficiency synchronous motor containing rare earth permanent magnets. The motor speed is adjusted in real time by a frequency converter to control the compressor's air output.
• Two-stage compression: This refers to the two-stage air compression process. After the first screw performs initial compression, the air is then fed into the second screw for further compression, ultimately reaching the desired pressure.
Product Parameters
| Two-stage PM VSD Screw Air Compressor | |||||||||
| Model | Air Delivery (m³min) | Power (kW/hp) | Noise dB(A) | Outlet diameter | Dimensions (mm) | Weight (kg) | |||
| 7 bar | 8 bar | 10 bar | 13 bar | L*W*H | |||||
| RK350APMII | 16.2-54.0 | 15.3-51.0 | 13.5-45.0 | 11.4-38.0 | 250/350 | 82 | DN100 | 3600*2200*2200 | 6000 |
| RK375APMII | 18.0-60.0 | 17.1-57.0 | 15.0-50.0 | 12.9-43.0 | 280/375 | 82 | DN125 | 3600*2200*2200 | 6800 |
| RK420APMI | 19.5-65.0 | 18.6-62.0 | 16.8-56.0 | 15.2-50.5 | 315/420 | 82 | DN125 | 4200*2300*2350 | 8000 |
| RK480APMII | 22.5-75.0 | 21.9-73.0 | 19.2-64.0 | 16.5-55.0 | 355/480 | 82 | DN150 | 4200*2200*2350 | 8500 |
| RK540APMII | 25.2-84.0 | 24.6-82.0 | 21.6-72.0 | 18.3-61.0 | 400/540 | 82 | DN150 | 4200*2200*2350 | 9800 |
Advantages and Features
Ultra-high energy efficiency, significant energy savings
◦ The permanent magnet motor's inherent efficiency reaches IE4/IE5 levels, 5-15% higher than conventional motors.
◦ Variable frequency control precisely matches output to gas demand, avoiding no-load waste. Energy savings can reach over 30%, especially in applications with large gas volume fluctuations.
◦ Two-stage compression reduces the compression ratio and internal leakage, lowering bearing loads and improving mechanical efficiency by approximately 10-15% compared to single-stage compression.
Excellent air supply stability:
◦ Variable frequency technology enables extremely precise air pressure control, achieving constant pressure supply with extremely small pressure fluctuations (e.g., ±0.01 bar), meeting the air supply requirements of high-end manufacturing.
High reliability and long life:
◦ The two-stage structure reduces load and temperature at each compression stage, resulting in less stress on bearings and rotors, reduced wear, and longer life for core components. 4. Smooth Startup, Minimum Power Grid Impact:
◦ The VFD enables soft starting, with a starting current lower than the rated current, thus avoiding the impact of direct starting on the power grid.
Low Noise and Vibration:
◦ Permanent magnet motors operate smoothly, with less noise and vibration than traditional asynchronous motors.
Application Industries
Due to its high power, high efficiency, and high stability, it is primarily used in large-scale industrial sectors with huge compressed air demands, requiring continuous and stable operation, and placing a strong emphasis on energy conservation. Examples include:
• Large-scale manufacturing industries: automotive, aerospace, and shipbuilding.
• Chemical and petrochemical industries: used as process air or instrument air.
• Mining and metallurgy: used to power large rock drills, pneumatic tools, and other equipment.
• Textiles and electronics: used in precision industries requiring a high-quality, stable air source.
• Centralized air supply stations: used to provide compressed air to entire industrial parks or large factories.
