Compressed air is generated by various types of compressors. The most popular types are: piston compressors, screw compressors and paddle compressors.
Piston compressors are the most popular devices used to produce compressed air (servi) . The principle of operation is based on the reciprocating piston. The plunger sucks atmospheric air, then compresses it, and in the next step the compressed air goes to the pressing area. The most common performance range of piston compressors is from approx. 100l / min to approx. 1000l / min. The main advantages of reciprocating compressors are their low price and relatively simple design. The disadvantages include: the need to work in intermittent mode, loud operation, worse durability and quality of the air received in relation, for example, to screw compressors.
Another, very popular type of equipment are screw compressors. In this case, two rotating, asymmetrical bolt shafts correspond to the production of compressed air. As a result of the interlocking of these elements, working chambers are created which transport the air from the suction side to the discharge side (https://www.servi.no/var-produksjon/hydrauliske-sylindere/) . The smallest screw compressors start with a capacity of about 250l / min, up to the largest devices with a capacity of several m 3 / min. The main advantages of screw compressors are: the possibility of continuous operation, quiet operation of the device, high efficiency, better quality of the air received compared to piston compressors. However, when it comes to defects, it is worth mentioning: high price and more complicated construction than piston compressors.
In the case of vane compressors (definitely less popular than the previous two types), the air production corresponds to the blades mounted on the rotor, which create the compression chambers between the rotor and the body (https://www.servi.no/service-og-vedlikehold/oljeanalyser/) . The rotor in relation to the body is not mounted centrally. During rotation of the rotor, due to the centrifugal force, the blades are pressed against the walls of the body forming the aforementioned chambers. As a result of the eccentric positioning of the rotor shaft, these chambers along with the rotation decrease, thanks to which the compression process is possible.
When selecting the right compressor for us, we meet with many technical data provided by the producers. The most important of them is the maximum pressure of the compressed air produced by the compressor (most often served in a bar), the compressor’s efficiency (the amount of compressed air produced per unit of time – usually l / min) and the voltage of the power supply and the engine power.