**Speed Type Compressors**: These compressors operate by utilizing gas to spin an impeller at high speed, generating significant kinetic energy. This energy is then rapidly reduced in a diffuser, converting the kinetic energy into potential energy and thereby increasing the gas pressure. The speed type includes two main categories: centrifugal and axial flow compressors.
As a rotary compressor, screw air compressors are known for their simple structure, compact size, and absence of air valve assemblies. They also offer unique advantages such as balanced forces, low friction losses, high volumetric efficiency, and minimal exhaust pulsation. These features make them widely used in industries like petrochemicals, shipbuilding, and refrigeration.
Injecting a proper amount of lubricating oil into the compression chamber helps cool and seal the gas, while also forming a lubricating film between the screw and the star wheel. The atomized oil increases the heat exchange area with the compressed gas, effectively cooling the high-temperature gas and reducing the exhaust temperature. This, in turn, lowers the compression work and enhances the reliability of the compressor.
Additionally, the injected oil fills the leakage gaps in the compression chamber, minimizing gas loss during compression. The lubrication provided by the oil reduces friction and wear between the screw and star wheel, extending the life of the components. However, excessive oil can increase viscous shear, friction, and agitation, which may raise power consumption and negatively impact the compressor’s performance.
Therefore, the amount of oil injected must be optimized to ensure efficient operation. Moreover, variations in exhaust pressure and compressor speed affect the relative gas leakage, which in turn influences the overall performance of the system.
This article is originally written by Deslan Compressor (Shanghai) Co., Ltd., a leading manufacturer of air compressors in Shanghai. For more information, visit [http://qq0226.goepe.com/](http://qq0226.goepe.com/)
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