• Find out more about our projects: https://www.jaescompany.com/elearning... • Here are some products installed by our technicians: https://www.jaescompany.com/catalogo_... JAES is a company specialized in the industrial components sector and offers 360-degree support for technicians and maintenance workers of large systems. Follow us on our social networks: Linkedin: / jaes-...​ Facebook: / ​ The compressor is a mechanical device that increases the pressure of a gaseous fluid by reducing its volume, so that it can be transported through pipes. Just as the pump is built to pressurize and transport liquid fluids (which by their nature have such low compressibility that they are considered incompressible), the compressor is instead designed to transport gaseous fluids, compressing them to increase their pressure and reduce their volume several times. Compressors are used for many applications in which it is necessary to increase the pressure or decrease the volume of a gas. They are used for example in the transport of natural gas in gas pipelines, in refrigeration and air conditioning equipment, to operate pneumatic tools, to blow plastic bottles and containers, and even to increase the performance of internal combustion engines. For this reason, there is not just one type of compressor that works for all applications but there are various models. We can immediately distinguish them into two large categories, Volumetric and Dynamic, where: with volumetric compressors the compression is given by well-defined mechanical movements; and with dynamic compressors the compression is obtained by means of the speed that can be given to the rotating parts. Among volumetric compressors we have: The reciprocating compressor that uses the work done by an electric or thermal engine, to increase the pressure of the gas. The gas to be compressed is sucked into the cylinder by means of the piston through the suction valve, while the compressed gas is expelled from the delivery valve; compressed gas is usually stored in a tank to dampen pressure and flow rate changes related to the reciprocating motion of the piston, furthermore, it allows for an accumulation of compressed gas so as not to have to keep the compressor running all the time. Moving on to the vane compressor, we have a type of compressor with a very different shape. A circular rotor is equipped with vanes, which are pushed by springs to keep them constantly in contact with the walls of the circular cavity, against which they slide. However, the rotor is not centered on the cavity, thus creating variable volume chambers, maximum on the suction side and minimum on the delivery side, thus obtaining the compression of the gas. The lobe compressor instead has rotors with a characteristic two or three lobe shape, which rotate in sync and in opposite directions, creating progressive chambers from the suction mouth to the delivery mouth. Being simple and without rubbing parts, they are robust and long-lasting machines. They are often used in supercharged Otto cycle engines. Very similar to the previous model, in the screw compressor, two reverse pitch screws are connected to each other, so as to create a cavity with the body of the compressor that progressively moves from the suction area to the delivery area, decreasing the volume and thus compressing the gas. Having little stress, it is suitable for continuous use and has a good performance. Lastly among the volumetric compressors we have the spiral compressor. This type of compressor uses two spirals one inside the other, one of which is fixed and one with a planetary movement without rotation, so as to compress the gas between them. Among the dynamic compressors, on the other hand, there is the centrifugal compressor. A turbomachine in which a bladed disk called an impeller, placed in rapid rotation, supplies energy to the gas to increase its pressure due to the centrifugal force. They are widely used in the supercharging of automotive engines. Lastly among the dynamic compressors we find the axial compressor where a bladed rotor is followed by a bladed stator fixed to the frame. The coupling of a rotor and a stator is called a stage. The single stage of an axial compressor produces a very low pressure, but thanks to its axial configuration it is well suited to multi-stage: where the flow exiting the stator is already ready to enter the next stage. The gas therefore flows parallel to the rotation axis, and as it progresses in the compressor its volume decreases while the pressure increases. Compared to the centrifugal compressor it manages greater flow rates but with a lower compression ratio. Their configuration makes them ideal for jet engines.