Oil Free Screw Blowers

Where aeration tanks and conveying lines call for large volumes of clean, low-pressure air, the oil free screw blower replaces the classic Roots blower with a dry screw stage. The screw rotors run completely dry, so the delivered air is 100% oil-free and there is no lubricating oil path to leak into the gas stream. The key efficiency advantage is internal compression: a traditional Roots blower only pushes air into the system against whatever pressure exists in the pipe, without compressing it inside the machine, while this screw design compresses air inside the rotor profile before discharge, which cuts energy use by 30-50% compared with Roots blowers of the same duty. A permanent magnet inverter drive adjusts flow across a wide range, so aeration supply can follow fluctuating tank demand - day-night load changes, seasonal biological variation - instead of blowing off excess air at fixed speed. The machine runs smoothly with low noise and vibration, which matters for urban treatment plants and indoor fermentation halls; because no lubricating oil is needed in the gas path, maintenance stays simple and environmental disposal of waste oil is eliminated. The smart control system maintains constant pressure automatically, so the blower adjusts output to the aeration demand without an operator watching the tank. For wastewater plants, fermentation tanks and pneumatic conveying systems, this blower is the standard energy-upgrade replacement for aging Roots installations, delivering clean air with lower electricity cost from the same blower room footprint. The series covers 55 to 315 kW with delivery from 7.7 to 50.2 m3/min at 0.7-1.0 MPa, so a single blower line can serve both a small package aeration system and a large municipal treatment plant's blower hall, without the efficiency penalty that comes from mixing machine types on the same site, and the inverter drive handles the wide turndown that blower stations need when aeration demand swings between day and night.

Wastewater and fermentation projects usually buy several blowers in one phase and run them in parallel for years of continuous duty. Our standardized batch production keeps air delivery, pressure and constant-pressure control behavior consistent unit to unit, so plant engineers can balance load between machines and stage maintenance without retuning each one. For EPC contractors, that consistency across a multi-blower order means the blower hall is commissioned on schedule, with predictable performance from the first unit to the last.

Wastewater treatment aeration. Aeration tanks are the largest energy consumer at a plant; internal compression cuts blower electricity 30-50% versus Roots units, and oil-free air avoids contaminating the biological process.

Biological fermentation. Fermenter aeration needs clean, oil-free air and variable flow as culture demand changes; the inverter drive follows demand smoothly, and quiet low-vibration operation suits indoor fermentation halls.

Powder pneumatic conveying. Conveying powders in food, chemical and plastic plants needs clean large-volume air; oil-free delivery prevents product contamination, while constant-pressure control keeps conveying speed stable.

Aquaculture aeration. Fish farm aeration requires reliable 24/7 blower supply; low maintenance and no waste oil handling reduce running overhead in remote farm sites.

Desulfurization oxidation and vacuum systems. Flue-gas desulfurization oxidation air and vacuum negative-pressure stations benefit from the screw blower's efficient internal compression and stable pressure control under varying load.

We select flow and pressure from the 55-315 kW series for the process, configure the inverter drive and voltage for the local grid, arrange inlet filters, outlet silencers and base-frame layout to the site, and offer cabinet color and OEM/ODM branding. A sample unit can be confirmed before mass production.

Blowers are export-packed on wooden pallets with plastic foam cushioning. The packaging has passed drop and vibration tests, meets international transport standards and clears customs inspection, so units arrive intact after long sea and land transit. EXW, FOB, CIF and DDP terms are supported, with standard delivery in 40 days and customized units in 60 days.

FAQ

 

Q: How are the blowers packed for international shipping?

A: Wooden pallet plus plastic foam cushioning, tested against drop and vibration, so machines arrive intact after long sea freight.

Q: Do you offer discounts for large aeration projects?

A: Yes. Volume discounts are provided based on order quantity, which suits treatment plants and EPC contractors purchasing multiple blowers per project.

Q: What is the MOQ?

A: One blower unit, so a single replacement blower can be ordered for an existing plant; repeat orders benefit from faster delivery.

Hot Tags: oil free screw blowers, China oil free screw blowers manufacturers, suppliers, factory, Dry Screw Compressor, electric air compressor, Explosion Proof Air Compressor, Oil Injected Screw Air Compressor, Precision Air Compressor, Small Inverter Screw Air Compressors