Air compressor oil content of less than 0ppm cannot be achieved in reality, usually "oil-free" refers to the compressed air oil content is very low, close to or below a specific standard (such as 0.01ppm or 0.01 mg/m & sup3;), rather than absolutely zero. The following is a detailed explanation:
definition and Unit of Oil Content in 1.
- Definition: Oil content refers to the quality of oil (including oil droplets, suspended particles, and oil vapor) contained in a unit volume of compressed air.
- Unit: Usually expressed in ppm (parts per million) or mg/m & sup3. 1ppm means 1 volume of oil per million volumes of air, or 1 milligram of oil per kilogram of air.
Actual situation of oil content of 2. air compressor
- oil air compressor: This type of air compressor uses lubricating oil to lubricate moving parts and take away heat during compression. Therefore, the discharged compressed air will contain a certain amount of oil. Generally speaking, the oil content of the compressed air of the oil-injected screw air compressor is not more than 3ppm(3 mg/m & sup3;), when the oil content exceeds this standard, it is usually called high fuel consumption or running oil or flying oil.
- Oil-free air compressor this type of air compressor does not use oil in the compression process, or uses special lubrication methods (such as resin material lubrication) to avoid contact between oil and compressed air. However, even oil-free air compressors cannot completely contain oil in the compressed air. Because the moving parts (such as bearings, gears, etc.) in oil-free air compressors still need to be lubricated, these lubricants may enter the compressed air in the form of extremely small amounts. Therefore, the oil content of the compressed air discharged by the oil-free air compressor is usually very low, but not absolutely zero.
Meaning of 3. oil content less than 0ppm
- theoretical impossibility: From a physical and chemical point of view, an oil content of less than 0ppm cannot be achieved in reality. Because even the purest air may contain trace amounts of oil vapor or other impurities.
- The "oil-free" standard in practice in practical applications, when the oil content of the compressed air discharged from the air compressor is extremely low, close to or lower than a specific standard (such as 0.01ppm or 0.01 mg/m & sup3;), the air compressor can be considered as an "oil-free" air compressor. This "oil-free" is relative, not absolute.
Effect of 4. oil content on application
- impact on precision manufacturing and medical fields: These areas require extremely high cleanliness of compressed air, and high oil content may affect product quality or patient safety. Therefore, these fields usually require the use of oil-free air compressors or equipped with efficient compressed air purification systems.
- Impact on the general industrial sector: In the general industrial field, the oil content of compressed air is relatively loose. However, in order to ensure the normal operation of the equipment and extend the service life, it is still necessary to control the oil content of the compressed air within a certain range.
