Oil-free screw air compressor is a positive displacement gas compressor with rotating movement in its working volume. The compression of gas is achieved through a change in volume, which is achieved by a pair of rotors of the air compressor rotating within the casing.

Detailed explanation of the working principle of oil-free screw air compressor

The main body of the compressor is equipped with a pair of meshing spiral rotors arranged in parallel. Rotors with convex teeth on the outside of the pitch circle are often called external rotors or external threads. The rotor with concave teeth in the pitch circle is called a female rotor or female thread. Generally, the male rotor is connected to the prime mover, and the male rotor drives the female rotor to rotate the last pair of bearings of the rotor. Provides axial positioning and withstands compressor loads and axial forces. Cylindrical roller bearings at both ends of the rotor enable it to be positioned radially and withstand radial forces within the compressor. Orifices of predetermined shape and size are opened at both ends of the compressor body. One is for air intake, called the "inlet" and the other is for exhaust, called the "exhaust port."

Air intake process of oil-free screw air compressor

Detailed explanation of the working process of the oil-free screw air compressor: when the rotor rotates, the tooth gap space of the male rotor and the female rotor will rotate to the opening of the air inlet. The space between the rotor tooth slot and the air inlet is the largest, because the gas in the tooth slot has been completely exhausted during exhaust, and the tooth slot has been completely emptied when the exhaust is completed. It is in a vacuum state and enters the tooth grooves of the male and female rotors from the axial direction. When the entire tooth slot is filled with gas, the air inlet end of the rotor faces away from the air inlet of the casing, and the gas in the tooth slot is sealed.

Compression process of oil-free screw air compressor

A detailed analysis of the working process of the screw air compressor is the compression process. When the male and female rotors complete suction, the tips of the male and female rotor teeth are closed by the shell. As a result, the gas will not flow into the grooves of the tooth. Its joint surface gradually moves toward the exhaust end. The tooth gap between the meshing surface and the exhaust port gradually narrows, compressing the gas in the tooth gap and increasing the pressure.

Exhaust process of oil-free screw air compressor

Detailed explanation of the working process of the screw air compressor Exhaust process: When the meshing end surface of the rotor rotates and communicates with the exhaust port of the casing, the compressed gas begins to be discharged, and the tooth tips and tooth grooves are all exhaust ports. When reaching the exhaust port, the tooth gap between the mating surface of the female and male rotors and the exhaust port of the casing becomes 0, and the exhaust stroke is completed. At the same time, the length of the tooth gap between the rotor meshing surface and the air inlet of the casing is maximized, and the air intake process is carried out again.

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Atlas Copco Oil-Free Screw Air Compressor For Sale - Youteng Machinery

Wuxi Youteng Machinery Co., Ltd. was established in 2012, mainly engaged in air compression system, vacuum system design consulting, engineering project and repairing services etc. Our company mainly provides air compressor equipments and  for compressors of world-famous brands. We also support OEM. In addition, The company has a number of experienced technicians to perform maintenance work on various air compressors, dryers and filters, which have a certain influence in China. At the same time, the company also participates in motor overhaul projects and maintains various motors. We have a complete service system and sufficient compressor spares to relieve customers from worries. If you are interested in atlas copco compressors, please contact us.