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Air and Gas Screw Compressor
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Design and Construction
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The screw compressors we supply at PVI are manufactured through technical aid of AERZEN Germany. They have two rotors with helical profiles and produced in two types; oil-free and oil-injected. These compressors are suitable for compressing air and gases.
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The rotors revolve without creating contact with each other and the compress chamber. In the oil-injected version, there are no synchronizing gears for the rotors. The male rotor drives the female rotor using the created thin film of oil between them. In the oil-free version, the rotors' revolution is synchronized through the use of gears, thus making it possible for the compressing chamber to be oil-free.
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Operating Mechanism
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Rotors - Oil-injected Ù
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A screw compressor is a twin-shaft rotary piston machine functioning on the principle of positive displacement combined with internal compression.
The medium handled is conveyed from the suction port to the discharge port entrapped in ever diminishing spaces between the convolutions of the two helical rotors, being thus compressed up to the final pressure before it is discharged into the discharge nozzle.
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In oil-injected screw compressors, the male rotor drives the female one using the film of oil created inside the cylinder. This film of oil makes a good sealant for the spaces between the rotors and increases the efficiency of the machine, hence greater compression ability. The injected oil also acts as the coolant of the system. It should be separated from the compressed air/gas at the outlet port, cooled and then re-injected into the cylinder.
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Rotors - Oil-free Ù
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In oil-free screw compressors, the male rotor drives the female rotors through the use of synchronizing gears.
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Due to the oil-free nature of the system, rotors are responsible for compressing the fluid in question without the help of a sealant (oil). This is the reason why in the oil-free version, the final output pressure is smaller than in the oil-injected version. However, since many applications require oil-free compression of air or gases, these models are still in great use in different fields in different industries.
Air or water is used for cooling the oil inside chambers holding gears and bearings.
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Types of Screw Compressors
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The screw compressors are manufactured in two types; oil-free and oil-injected. For information about different models in each type, please refer to the following links. You may also refer to the AERZEN product page for screw compressors to gain more insight into this product.
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Oil-Injected
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Oil-Free
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