In some industries, it is essential that compressed air used in production is completely free of contaminants.
This may sometimes appear as a buildup on the exhaust ports of air-powered tools and equipment. A separator after the compressor pulls out most of this oil, leaving a very small amount that is carried into the air distribution network. In addition, it provides lubrication and takes away heat.Īs air moves through the compressor some of this oil becomes entrained. Its main function is to seal the gap between the piston ring and cylinder wall or screw tips and housing. In both of these designs, oil is injected into the compression chamber. In a rotary screw design, compression is performed by a meshed pair of helical screws that suck air in and squeeze it into a reducing volume. Air is drawn in on the downstroke and compressed on the upstroke. In a piston compressor, also called a reciprocating compressor, a piston moves up and down in a cylinder.
How Oil Gets Into Compressed AirĮvery air compressor is a pump, the two most common types being piston and rotary screw. First, though, it is important to be clear about what “oil-free” means and why it can be important. Here we’ll discuss the maintenance and repairs needed by oil-free compressors, and how this differs from oil-injected designs. What’s more, while oil-free compressors may need less frequent attention it might be argued that they need overhauling more often. While there are differences in what oil-free and oil-injected compressors need, neither type will provide reliable operation with no maintenance at all. One of the benefits touted for oil-free air compressors is reduced maintenance.
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