The rotary screw element is an example of a highly engineered part, with thousands hours of research into it. There are many variables to think about when designing the best screw element. As said before, oil-free screw compressors used two stages, with an intercooler to reach the desired end pressure. But why is it so. .
Let me explain how a rotary screw element is built up. See this example picture of an oil-free screw element. Compressor element. .
Air-ends come in many different sizes, but they all look basically the same. Here are some photos of air compressor elements. Air compressors element. This one is on a brand new. .
There are two basic types of screw compressor: oil-injected and oil-free. Oil-injected rotary screw compressors are the most common, since they are the cheaper ones of the two. .
How does it work? Inside the compressor element are two screws (called 'rotors') that turn in opposite direction. The rotary screw compressor is. [pdf]
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