**Speed Type Compressors**: These types of compressors operate by using the kinetic energy generated from high-speed rotation of an impeller, driven by gas pressure. This process creates a large amount of kinetic energy, which is then rapidly reduced in a diffuser, converting the kinetic energy into potential energy and increasing the gas pressure. The speed type compressor primarily includes two basic designs: centrifugal and axial flow.
As a rotary compressor, the screw air compressor is known for its simple structure, compact size, and absence of air valve components. It also offers unique advantages such as balanced forces, low friction losses, high volumetric efficiency, and minimal exhaust pulsation. Because of these benefits, it is widely used in industries like petrochemical, shipbuilding, and refrigeration.
Injecting an appropriate amount of lubricating oil into the compression chamber helps to cool the gas, seal the chamber, and create a lubricating film between the screw and the star wheel. This oil atomizes within the chamber, significantly increasing the surface area for heat exchange and effectively cooling the high-temperature compressed gas. As a result, the exhaust temperature is reduced, and the overall work required for compression is minimized, leading to improved reliability of the compressor.
The injected oil also fills the leakage gaps within the chamber, reducing internal gas leakage and minimizing energy loss during compression. Additionally, the oil forms a protective layer between the screw and the star wheel, reducing friction and wear, and extending the lifespan of the components. However, excessive oil can increase viscous shear, friction, and agitation, leading to higher power consumption and potentially affecting the compressor’s performance.
Therefore, the optimal amount of lubricating oil must be carefully controlled. Moreover, the difference between the exhaust pressure and the compressor speed affects the relative gas leakage, which in turn influences the overall performance of the unit.
This article is originally published by **Shanghai Deslan Compressor (Shanghai) Co., Ltd.** (http://qq0226.goepe.com/). Please cite the source and respect the copyright.
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