The vacuum pump cannot replace the air compressor, because the vacuum pump is to obtain a vacuum, and the air compressor works at high pressure, and the twoare completely different.
Air compressor：
1. The air compressor is the main body of the air source device. It is a device that converts the mechanical energy of the prime mover into gas pressure energy, and is a pressure generating device for compressed air.
2. There are many types of air compressors, which can be divided into positive displacement compressors, centrifugal industrial compressors, and piston compressors according to their working principles.
1) The working principle of the positive displacement compressor is to compress the volume of the gas, so that the density of the gas molecules in the unit volume increases to increase the pressure of the compressed air;
2) The working principle of the centrifugal compressor is to increase the movement speed of the gas molecules, so that the kinetic energy of the gas molecules is converted into the pressure energy of the gas, thereby increasing the pressure of the compressed air.
3) The working principle of the piston compressor is to directly compress the gas and discharge it when the gas reaches a certain pressure.
3. The commonly used air compressors are piston air compressors, screw air compressors, centrifugal compressors, sliding vane air compressors, and scroll air compressors.
Relevant persons said that the choice of air compressor is mainly based on the working pressure and flow of the pneumatic system. The working pressure of the air source should be about 20% higher than the maximum working pressure in the pneumatic system, because the loss along the way and the local loss of the air supply pipeline should be considered. If the working pressure requirement is lower in some parts of the system, a pressure reducing valve can be used to supply air. The rated discharge pressure of the air compressor is divided into low pressure (0.7~1.0MPa), medium pressure (1.0~10MPa), high pressure (10~100MPa) and ultra-high pressure (above 100MPa), which can be selected according to actual needs. Common pressure is generally 0.7~1.25MPa.
vacuum pump：
1. Structure and principle
"Vacuum" refers to a gaseous space with a pressure of less than 101.3 kPa. Any device that can extract gas from the container and reduce the gas pressure can be called a vacuum pump. The vacuum pump commonly used in the inspection room is an oil-sealed mechanical vacuum pump, and the vacuum degree is generally 101~1Pa. This kind of pump has a steel cylindrical stator, in which there is an eccentric steel solid cylinder as a rotor, and a sliding vane with a spring is embedded in the diameter of the rotor. When the motor drives the rotor to rotate, the sliding vane is in the cylindrical shape. It operates in the cavity of the pump, so that the pump cavity is divided into two regions, and its volume expands and contracts periodically. After connecting the gas container to be pumped to the air inlet of the pump, when the space of the pump cavity increases, the gas to be pumped is inhaled, and as the rotor rotates, the gas is compressed and discharged from the exhaust port. The rotor rotates continuously, the process of suction, compression and exhaust is repeated continuously, the gas in the container is continuously reduced, and the air pressure is continuously reduced. The whole machine is immersed in a box containing lubricating oil, and the vapor pressure of lubricating oil is very low, which plays the role of lubrication, sealing and cold action.
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