Screw compressors are one of the types of compressed air compressors used in industry, and their operating mechanism is rotary. The capacity of screw compressors is from 2000 liters per minute and up, which is determined according to the capacity required by the customer. The screw compressor, which is also called an air compressor in colloquial language, is generally used in high capacities of compressed air. The screw compressor is between the piston compressor and the centrifugal compressor in terms of its operating range, and the reason is that the storage structure of this compressor is of the positive displacement type, and therefore it is similar to the piston compressor, and because the air flow passing through this compressor is continuous, it is similar to the centrifugal compressor, so it is a good option for pressurizing compressed air and also the refrigerant gas used in cooling systems. Types of Compressed Air Screw Compressors Screw compressors are generally designed and manufactured in two types: Oil-free screw compressor or Oil-free compressor Oil-injected screw compressor or Oil-injected screw compressor In an oil-injected screw compressor, oil is injected into the air entering the compressor to cool and reduce friction between parts, which is also called air lubrication. This method ensures that there is always some oil between the moving parts of the compressor and completes the lubrication process. This oil is eventually discharged from the compressor outlet along with the compressed air, which is separated from the compressed air using an oil filter and returned to the oil storage tank. In an oil-injected screw compressor, after the oil is separated, a small amount of oil enters the system along with the air, and if the presence of this amount of oil does not cause damage to the devices that consume compressed air, especially precision and sensitive instruments, and does not reduce efficiency, this compressor will have a higher efficiency and lifespan than the oil-free type. Of course, it should be noted that the use of oil filtration and separation in an oil-injected screw compressor increases the cost as much as the high accuracy required. Advantages and differences between an oil-free screw compressor and an oil-injected compressor An oil-free screw compressor is used in industries that are completely sensitive to oil (less than 1PPM), which has a much higher cost and depreciation than an oil-injected compressor, but this compressor also has advantages. In an oil-free compressor, the compressed air is completely oil-free and there is no contamination in it. As a result, in addition to air, any gas can be compressed with this compressor. For example, in an oil-free screw compressor, even polymer gases or dirty gases can be compressed. Features of a compressed air screw compressor The most important advantage of a screw compressor is the absence of fluctuations in maximum working pressure. In screws, there are fewer parts involved and subject to friction than in a piston compressor, and as a result, it requires less maintenance and repairs. The air capacity in this compressor is highly efficient due to • Surge and Stonewall and Stall in comp... uniform flow. Small volume compared to other compressors. Very simple foundation due to balanced forces. There is much less vibration. Due to continuous air compression, there is no possibility of surg or air returning to the air conditioner. Due to limited seals in the compression chamber, there is little leakage. Reduced energy consumption relative to compressor capacity. Smooth power switching in the electric motor by inverter. Ability to operate at maximum capacity for a long time. Installation and commissioning in the shortest possible time. #Oil free air compressor#Dry compressor#Dry screw compressor#piston vs screw compressors#vsd screw compressor#vfd screw compressor#helical screw compressors#largest screw compressors#screw compressors sale#screw compressors usa#scroll compressor • Surge and Stonewall and Stall in comp...