Rotary screw compressors satisfy the compressed air or gas needs of larger industries; they’re widely used in the brewing industry for example. Why? Because rotary screw compressors offer a number of attractive benefits to industry: they’re ecologically-friendly, comparatively cost-effective to run, make little noise in operation and are easy to maintain. In fact, although rotary screw compressors employ a very simple principle of physics to compress air or gas, trying to explain exactly how rotary screw compressors work can be a bit tricky. Here goes.
The rotary screw compressor uses two large helical screws (known as the ‘male’ and ‘female’ rotors) which interlock precisely. When these twin rotors rotate, air (or other gas) is pulled into them at one end and compressed as its pushed through the tight confines between the interlocking helixes of the rotors. In a continuous process whilst the rotors are in operation, compressed air or gas is expelled as new air or gas is drawn in.
They say that a picture speaks a thousand words, so if that explanation seems a bit much to get your head around, here’s a lovely little video that shows – simply- how rotary screw compressors work to efficiently and reliably produce the large-scale quantities of air or gas required by industry.
Oil-flooded rotary screw compressors have the edge over oil-free versions in terms of compressed air output as the introduction of oil effectively creates a tight hydraulic seal between the interleaved helical rotors, and also serves to lower the temperature of the air as it is compressed and to lubricate the rotary screw compressor.