BWV Series PM VSD Screw Blowers

In wastewater aeration, pneumatic conveying, chemical and cement applications, blowers are often equipment that never rests all year round. They attract less attention than the main compressor yet account for a substantial share of the electricity bill year after year; at the same time, the noise and pulsation of traditional Roots blowers force many companies to put them in a corner far from the workshop.

The Fusheng BWV Series PM VSD screw blower is designed for exactly these two issues: it replaces the traditional Roots structure with screw rotors and combines a high-efficiency PM motor with a high-precision inverter, making compression smoother and more efficient. It can save up to 25-35% energy compared with traditional Roots blowers, with noticeably lower noise as well.

The Energy Weak Points of Traditional Roots Blowers

A Roots blower is a positive-displacement machine: two rotors push the gas out, and when the gas meets back pressure at the outlet it produces backflow and pulsation. To cope with pressure fluctuations it usually needs a large power margin, so operating efficiency cannot always stay in the ideal range; and since most Roots blowers run at fixed speed, changes in demand can only be handled by venting or throttling a valve, with obvious energy waste.

In addition, a Roots blower needs clearance between the rotors and the casing, so leakage and backflow are unavoidable in operation, and the higher the pressure, the more noticeable this loss. For duty that runs continuously for long periods, these losses are magnified into a full year's electricity bill.

Screw Rotors: A Smoother Compression Process

A screw blower uses intermeshing screw rotors, and the gas is compressed continuously and smoothly in the rotor chamber before being discharged. Compared with the pushing action of a Roots blower, the screw structure compresses in a more continuous way, with less air pulsation and a steadier discharge, which directly produces lower vibration and noise.

PM Motor + High-Precision Inverter

The BWV series uses a high-efficiency PM motor paired with a high-precision inverter for speed control. When air demand falls, the blower speed drops and output matches demand, avoiding the fixed-speed waste of venting the excess air.

It is this combination that lets the unit achieve 25-35% energy savings over traditional Roots blowers while running more smoothly.

Noise Far Below Roots Blowers

Noise is a factor often underestimated when selecting a blower. Traditional Roots blowers produce considerable pulsation and mechanical noise, and many projects need a separate blower room with soundproofing. Thanks to its screw structure and PM direct drive, the BWV series runs noticeably quieter and places looser demands on installation location, helping shorten piping and reduce pressure loss. For aeration or conveying duty that runs 24 hours a day, each step down in noise eases the pressure on the workplace environment and occupational health management.

Specifications at a Glance

Industries and Applications

• Wastewater treatment: aeration needs a continuous, steady air supply;
• Pneumatic conveying: air conveying of powders and granular materials;
• Chemical and cement: process air supply and combustion air;
• Food and fermentation: processes needing a clean, stable air supply;
• Continuous blower duty in textiles, papermaking and other industries.

Selection Advice

1. Determine the required air volume and pressure first, avoiding oversizing for the maximum case;
2. Where demand fluctuates noticeably, prioritise the savings from VSD control;
3. In noise-sensitive plants, consider first the screw blower's advantage in installation location;
4. Include running energy and maintenance cost in a full-life-cycle comparison, rather than looking only at purchase price.

Conclusion

The logic of buying a blower is changing, from affordable to buy to affordable to run. With its combination of screw structure, PM motor and VSD control, the BWV Series puts smoothness, low noise and energy saving into one machine, and its 25-35% energy saving over traditional Roots blowers will prove itself in long-term continuous operation.