1. Overview

The lubrication system in oil-free screw air compressors is a separated oil supply circulation unit, the compression chamber and the bearing are tightly separated by a high-performance mechanical seal assembly. The lubricating oil can only flow in the enclosed area and cannot enter the compression chamber. The air in compression room is pure air without impurities. After a treatment of water and dust removal, 100% pure compressed air can be obtained

The oil-free screw air compressor compresses the air through a two-stage screw rotor, and removes the water in the compressed air through a water-gas separator. At the same time, because there is no spread oil cooling, a pre-cooler, intercooler, and after-cooler are generally configured to cool the compressed air to reach the required exhaust temperature. A shaft seal with excellent performance is used on the shaft of the rotor to prevent lubricating oil from leaking into the compressed air to achieve true oil-free.

The oil-free screw air compressor is a positive displacement gas compression machine with a rotary motion of the working volume. The compression of the gas is achieved by the change of the volume, and the change of the volume is achieved by the rotary motion of a pair of rotors of the air compressor in the casing.

2. Characteristic

• The conventional process flow of the air compressor system: air compressor → gas storage tank → precision filter → Freeze dryer → adsorption dryer → precision filter → precision filter → activated carbon filter → gas storage tank
• The air compressor can be driven by fixed frequency or variable frequency, with precise control, saving at least 30% of energy consumption
• The air compressor can realize remote real-time monitoring and intelligent maintenance
• The air compressor can adopt a touch screen intelligent controller with powerful control and communication functions
• The screw main engine uses three-wire meshing, non-equal width tooth technology, meshing pair water film contact, no wear, good force balance
• The screw main engine, pipes, and parts are all made of corrosion-resistant special stainless steel materials
• Using SKF bearings, independent internal air-sealing technology, to ensure that the lubricating water will never contact the bearing, and to maintain the service life of the bearing
• Unique water filtration and lubrication system to ensure good lubrication, sealing, noise reduction and cooling functions
• 100% pure and oil-free, 100% oil-free compression system, low noise, super energy saving;
• Ideal isothermal compression: Since the cooling performance of water is much higher than air compressor oil’ s cooling performance, the operating temperature of the oil-free screw air compressor is only 40°C, which is close to the suction temperature, achieving high-efficiency ideal isothermal compression
• Environmental protection and high efficiency: Since there is no lubricating oil, there is no oil pollution; the high-precision water filter ensures that the lubricating water maintains clean quality.
• Reliable and user-friendly design, reasonable layout, simple and fast service channel, easy maintenance or fault repair
• The back end of the air compressor can be equipped with supporting equipment and systems such as freeze dryer, adsorption dryers, precision filters, gas storage tanks, etc.
• The air compressor can choose the gas output of 1-60m³/min, the pressure is 7bar  
• 0.1m³～100m³ gas storage tanks of more than 200 specifications with different volumes
• Flaw detection, water pressure test, 100% non-destructive test for the butt weld seam of the gas storage tank
• The best energy-saving working conditions can be set according to dew point requirements, inlet flow, pressure, and temperature