With industrial production moving toward high efficiency, low carbon, and intelligent operation, the low-pressure air supply system has become a key factor affecting operating costs and product quality. Traditional modes such as Roots blowers and high-pressure air decompressed to low pressure are gradually unable to meet the requirements of modern continuous production due to low efficiency, high energy consumption, and high noise.With the advantages of built-in compression, precise pressure regulation, and high reliability, low-pressure screw blowers have become the preferred air supply solution in sewage treatment, pneumatic conveying, chemical fermentation, textile printing and dyeing, food, pharmaceutical, and other industries, reconstructing the application value of low-pressure air supply through technological innovation.
Technical Core: From “Passive Air Supply” to “Efficient Internal Compression”
Low-pressure screw blowers are positive-displacement machines with internal compression, operating in the pressure range of 0.3–1.5 bar(g), precisely matching most low-pressure process requirements.Their working principle includes:
Precision meshing of male and female rotors, rotating synchronously without contact or wear;
Isentropic internal compression, where the chamber volume gradually decreases to complete compression inside the machine, avoiding external pressure loss;
High-efficiency direct drive, eliminating belts or gearboxes with transmission efficiency ≥98%;
Intelligent variable frequency control, adjusting speed in real time according to Compared with traditional Roots blowers, under the same air flow and pressure, the comprehensive energy saving rate can reach 30%–40%, with lower exhaust temperature and more stable air flow, achieving a leap in energy efficiency.
Application Value in Production Scenarios
Aeration for Wastewater Treatment
Aeration accounts for nearly 50% of total energy consumption in wastewater plants. Low-pressure screw blowers adjust air flow automatically based on dissolved oxygen, ensuring stable pressure and continuous air supply without pulse impact.
Pneumatic Conveying of Powder Materials
Suitable for cement, grain, chemical powder, plastic pellets, and other dilute-phase conveying. They provide ISO 8573-1 Class 0 oil-free air, uniform and non-pulsating air flow, reducing pipeline wear and blockage risks.
Oxidation and Fermentation Processes
Chemical oxidation, biological fermentation, and aquaculture aeration require high stability in air flow and pressure. Pressure fluctuation is ≤±1%, ensuring stable reactions and high yield.
Textile, Food, Electronics, and Other Clean Industries
Oil-free air quality, direct low-pressure output, and compact design make them ideal for clean processes, avoiding energy waste from “high pressure to low pressure” systems.
Core Advantages
High Energy Saving
Internal compression, direct drive, and variable frequency technology reduce power consumption significantly.
Stable and Long Service Life
Non-contact rotors, high-precision bearings and seals support more than 6,000 hours of trouble-free continuous operation.
Low Noise and Environmentally Friendly
Operating noise as low as 73–85 dB(A), suitable for workshop use.
Intelligent Control and Monitoring
PLC control, remote monitoring of pressure, flow, temperature, and energy consumption.
Strong Adaptability
0.3–1.5 bar operating range covers more than 90% of low-pressure processes.
Selection and Application Suggestions
- For continuous operation ≥4000 hours and pressure 0.4–1.0 bar: permanent magnet variable frequency low-pressure screw blowers are recommended.
- For food, pharmaceutical, electronics: Class 0 oil-free models are required.For example, MINNUO‘s MN-15A oil-free blower.
- Avoid “high-pressure air for low-pressure use”, which wastes more than 30% energy.
Conclusion
Low-pressure screw blowers are more than just air supply equipment; they are a key support for energy saving and efficiency improvement in industrial production.
Driven by the “dual carbon” goal and lean production, they help enterprises reduce costs, improve competitiveness, and provide stable, reliable, and efficient power for green intelligent manufacturing.
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