Why can’t the air from an air compressor be used directly?
Release time:
2025-08-13
As is well known, air is compressible, and the function of an air compressor is to compress air, reducing its volume and increasing its pressure.
So why can’t the compressed air from a compressor be used directly?
1. Effect of Water
Air containing a certain amount of water vapor is called humid air, while air without water vapor is called dry air. The composition and proportion of dry air are basically stable and constant. Although the water vapor content in humid air is not large, it has a significant impact on the physical properties of the air. The amount of water vapor determines the dryness or humidity of the air.
After humid air is compressed, the water vapor density increases and the temperature rises. When the compressed air cools, the relative humidity also increases. If the temperature continues to drop to the point where relative humidity reaches 100%, water will condense from the compressed air. This temperature is called the pressure dew point of the compressed air.
2. Effect of Oil and Solid Substances
The air after passing through the compressor contains oil, because during compression, air comes into direct contact with oil. Even after passing through an oil–air separator, not all the oil can be removed, but the separator can control the oil content in the air to between 3 ppm and 6 ppm.
3. Effect of Solid Particles
Solid particles such as rust sludge, metal fines, tar particles, and debris from filters or sealing materials can all affect the quality of compressed air.
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