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Rotary screw air compressors
The compressed air source for the factory to our easy to understand information on rotary screw air compressors. On this page, I want to tell you about the pros and cons of the rotary screw compressor, what to look for when buying one and common breakdowns that might occur during operation.
This is a non-stopping process, this kind of compressor doesn’t create a lot of noise; it runs saliently and smoothly. The Compared to piston-type reciprocating compressors to the screw compressor is much more costly. But it has to run 24/7 and 365 days a year without any problems. The capacity of screw compressors is generally much high compared to piston-type compressors.
The screw air compressor element was first developed in the 1930s, it has consisted of a male and female rotors. The rotors are of the different shape but fitted each other exactly. When working the male rotor drives then female rotor if it’s an oil-injected screw compressor technology, and a timing gear drives both rotors in the oil-free compressor technology as both rotors will moving harmonically with minimum calculated clearance between both elements.
A rotary air compressor is the best positive displacement compressors. The mostly rotary air compressor is used to the single stage helical or spiral lobe oil flooded screw air compressor. This Type of compressors consists of two rotors and both rotors are casing where the rotors compress the air internally. This type of compressor is not present valves. These compressor units are basically oil cooled, where the oil seals in the internal clearances.
Rotary screw air compressors are easy to operate. Capacity control for these compressors is variable speed and variable compressor displacement. The compressor capacity is reduced, When the slide valve opens, bypassing a portion of the compressed air back to the suction. The Best advantages of the rotary screw compressor include smooth and pulse-free air output in a compact size with high output volume over a long life.
The oil-free rotary screw air compressor utilizes especially working to air ends to compress air without oil in the compression chamber yielding true oil-free air. Oil-free rotary screw air compressors are available air cooled and water cooled and provide the same flexibility as oil flooded rotaries when the oil-free air is required.
OIL-FREE OR LUBRICATED
The rotary screw compressor is available in oil-injected and oil-free versions only. The basic principle is the same but they are the different machine.
In this Machine is the big difference in the design of the compressor elements. The oil-injected version needs oil to operate properly, in the oil-free version doesn’t need oil.
The rotors screw compressor used in oil-free screw compressors are the superior quality with very less space in between them. They are not touching each other though; otherwise, they would wear-down too quickly.
Oil-free models are used for specific special applications. I have mostly seen and use them on the big factories like oil/gas or chemical refineries, the big food factories or other places where the compressed air must be 100% oil-free.
If you are require100% oil-free air and lots of it, then oil-free rotary screw compressor is used
- 100% oil-free air
- More expensive than oil-injected type compressor
- Servicing/repairing more difficult, and more
expensive than oil-injected type
- More noise than oil-injected compressors
OIL-INJECTED ROTARY SCREW COMPRESSORS
There’s oil injected in the compressor element during the compression of the air. This oil is removed after some time by the oil separator, so we end up with clean compressed air.
In the compressor 99, 9% of the oil stays inside the compressor, there is always a less oil that passes through the separator and leaves the compressor with the compressed air. This is called oil carryover.
Oil-injected screw compressors don’t produce oil-free air and they can’t be used in places because in industries oil-free air is needed.
Most of the factories, workshops, and machinery, the small oil-carryover of the compressor is not a problem. In fact, it helps to prevent again rust and helps the machines run smoothly.
Example of the small rotary screw compressor.
- Quiet operation
- The high volume of air with the steady flow.
- Lower energy cost
- Suitable for continuous operation (24/7)
- Expensive compared to piston compressors.
- Not suitable for long stand-stills.
- Oil carry-over.