Special separators are used for air deoiling in compressors and internal combustion engines. In screw compressors, an oil mist is injected into the intake air to seal and lubricate the two rotors. These oil droplets also help to dissipate the heat that is generated as the air is compressed. After the compression process, separators are used to remove the oil droplets from the compressed air.
They contain fine glass fibers that trap many tiny oil droplets in the nanometer range, causing them to coalesce into larger droplets that are then drained off by means of a drainage fleece (polyester medium) and returned to the oil circuit.
Air deoiling for internal combustion engines
In internal combustion engines, separators are used for blow-by-gas deoiling. The oil-saturated air that flows past the piston is guided through a separator (or also called a crankcase breather) for deoiling. The oil removal is based on the principle mentioned above – glass or polyester fibers accumulate tiny oil droplets, which are then drained off by means of gravity and returned to the oil circuit.
To overcome the pressure differences inside combustion engines, the clean-air line is typically connected between the air filter and the engine inlet – the negative pressure there causes the blow-by gas to be “sucked” through the separator. Furthermore, air deoilers are also used for tank ventilation or as exhaust air filters in “oily air” systems.
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