Jiangsu Jufeng Machinery Manufacturing Co., LTD company FAQ

Oil-injected screw air compressors are widely used in industrial settings due to their high efficiency, reliability, and cost-effectiveness. Here’s why they stand out:

1. High Efficiency & Stable Performance

• Improved volumetric efficiency: Oil sealing reduces internal leakage, enhancing compression, especially in high-pressure applications.
• 24/7 continuous operation: Oil lubrication minimizes wear, ensuring long-term stability.

2. Superior Cooling & Durability

• Direct cooling: Injected oil absorbs heat, keeping discharge temperatures below 80°C, preventing rotor damage.
• Extended lifespan: Reduced thermal stress protects bearings and rotors.

3. Low Noise & Vibration

• Oil damping cuts noise by 5-10 dB, ideal for hospitals and labs.

4. Easy Maintenance & Cost Savings

• Advanced filtration (3-stage separation) extends service intervals (2,000-8,000 hours).
• Lower upfront cost (30-50% cheaper than oil-free models).

5. Wide Adaptability

• Handles dusty/high-temperature environments (mining, metallurgy).
• Energy-saving (20-40% at partial loads via VFD/slide valve control).

6. Controlled Air Quality

• Minimal oil carryover (≤3ppm) with efficient separators, meeting ISO 8573-1 Class 1.

Limitations vs. Oil-Free Compressors

• Requires regular oil/filter changes but offers better energy efficiency.
• Needs additional filtration for oil-sensitive applications (food/pharma).

Typical Applications

✔ Manufacturing (injection molding, CNC)
✔ Construction (pneumatic tools)
✔ Chemical plants & power stations

Conclusion: Oil-injected screw compressors balance performance, cost, and reliability, making them a top choice for industrial use. Select based on airflow, pressure needs, and air quality standards.

Recommended System Sizing
For optimal performance, select an air dryer with at least 10% greater capacity than your air compressor.

Example:

• Air compressor output: 3.6 m³/min

• Ideal cold dryer capacity: 4 m³/min

The precision filter should always be matched to the air dryer's specifications.