Low Pressure Oil-Free Screw Blower
Energy-Efficient
Low Noise
Stable Airflow
Intelligent Control
The low pressure oil-free screw blower is designed for continuous air supply applications requiring stable pressure, large airflow, and low operating costs. Based on the thermal compression principle, it delivers higher efficiency, lower noise, and smoother airflow compared with traditional Roots blowers.
Overall efficiency ≥ 75%, around 10% energy saving vs. Roots blower
Stable discharge pressure with minimal pulsation Oil-free air output, suitable for long-term continuous operation
Product Overview
The low pressure oil-free screw blower is a positive displacement blower using a pair of precision screw rotors to compress air continuously.
It operates efficiently within a pressure range of 0.4–1.5 bar, providing smooth, low-pulsation airflow for industrial processes where reliability and energy efficiency are critical.
This blower is an ideal replacement for conventional Roots blowers in medium and low pressure applications.
The compression process is continuous and stable,
consisting of four stages
Suction Start
As the rotors rotate, the inlet opens and air enters the rotor chambers.
Suction End, Compression Start
The inlet closes, and the trapped air is sealed inside the rotor grooves.
Compression Process
The volume of the rotor chambers gradually decreases, increasing air pressure smoothly.
Compression End, Discharge Start
Once the target pressure is reached, compressed air is continuously discharged.
This continuous compression process eliminates sudden air release, significantly reducing pressure pulsation and noise.
Application Scenarios
Wastewater Treatment Aeration
Challenge
High energy consumption and unstable airflow from traditional blowers
Solution
Continuous, low-pulsation air supply from screw blower
Result
Reduced energy cost and more precise dissolved oxygen control
Pneumatic Conveying of Raw Materials
Challenge
Pressure fluctuation affects conveying stability
Solution
Stable airflow with minimal pulsation
Result
Improved conveying efficiency and reduced pipeline wear
Cement and Bulk Material Conveying
Challenge
Heavy-duty operation with high mechanical stress
Solution
Robust screw structure with stable load distribution
Result
Longer service life and reduced downtime
Flue Gas Desulfurization (FGD) Oxygen Supply
Challenge
Requirement for clean and stable air pressure
Solution
Oil-free compression with precise pressure control
Result
Reliable system operation and improved process stability
Wastewater Treatment Aeration
Challenge
High energy consumption and unstable airflow from traditional blowers
Solution
Continuous, low-pulsation air supply from screw blower
Result
Reduced energy cost and more precise dissolved oxygen control
Pneumatic Conveying of Raw Materials
Challenge
Pressure fluctuation affects conveying stability
Solution
Stable airflow with minimal pulsation
Result
Improved conveying efficiency and reduced pipeline wear
Cement and Bulk Material Conveying
Challenge
Heavy-duty operation with high mechanical stress
Solution
Robust screw structure with stable load distribution
Result
Longer service life and reduced downtime
Flue Gas Desulfurization (FGD) Oxygen Supply
Challenge
Requirement for clean and stable air pressure
Solution
Oil-free compression with precise pressure control
Result
Reliable system operation and improved process stability
Problems Solved
High energy consumption of Roots blowers
Excessive noise and vibration
Large pressure pulsation affecting process stability
Frequent maintenance and high lifecycle cost
Outcomes You Get
Lower operating energy cost
Quieter working environment
Stable and continuous airflow
Reduced maintenance frequency
Product Series Options
Economic Series Oil-Free Screw Blower
Integrated skid-mounted design
Complete assembly delivered from factory
Minimal on-site installation (piping and power connection only)
Optional configurations:
Intelligent Series Oil-Free Screw Blower
Fully integrated skid enclosure
Built-in pressure and temperature monitoring
PLC control system, VFD, and touchscreen HMI
Supports remote monitoring and multiple communication protocols
Permanent Magnet Motor Advantages
BLG170LA
Outlet Size
Airflow (m³/min)
Pressure (bar)
Speed (rpm)
BLG180LA
Outlet Size
Airflow (m³/min)
Pressure (bar)
Speed (rpm)
BLG300LB
Outlet Size
Airflow (m³/min)
Pressure (bar)
Speed (rpm)
BLG360RB
Outlet Size
Airflow (m³/min)
Pressure (bar)
Speed (rpm)
More models and customized configurations available upon request.
Frequently Asked Questions
Is an oil-free screw blower suitable to replace a Roots blower?
Yes. In the 0.4–1.5 bar range, it offers higher efficiency, lower noise, and smoother airflow.
Is the air completely oil-free?
Yes. The compression chamber is fully isolated from the lubrication system.
Does the blower support VFD control?
Yes. Variable frequency control is available for energy optimization.
How often is maintenance required?
Lubricating oil is recommended to be replaced every 3–4 months.The inlet filter element is typically replaced once per year.
Reliability & Support
Designed according to industrial equipment standards
Technical support, spare parts, and maintenance guidance available
Proven structure for continuous-duty operation
Custom engineering and system integration support
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Low pressure oil-free screw blowers are application-specific industrial equipment. To receive an accurate quotation and selection proposal, please provide:
Email
sales:+86 15366749631
