What Type of Oil Should Be Used for Air Compressor Lubrication?
2 Answers
Air compressors require either No. 32 or No. 46 lubricating oil, depending primarily on the type of air compressor. Small air pumps generally use mechanical oil, while compressors with a capacity above 0.6 require specialized lubricating oil. Air compressors must use specific compressor oil and cannot be substituted with regular motor oil, as arbitrary replacement may lead to malfunctions. Below are the types of air compressors: 1. Scroll Compressor: This is a compact type of compressor. Despite its small size, it maintains high efficiency and operates smoothly. Its most notable advantage is its noiseless operation, creating a quiet working environment, hence it's also referred to as the 'Ultra-Quiet Compressor.' 2. Centrifugal Compressor: A high-power compressor with a relatively narrow frequency and application range. However, its capabilities are significant. It occupies minimal space, handles large gas volumes, and ensures the compressed gas remains uncontaminated, making it both convenient and effective. 3. Sliding Vane Compressor: Its main components include the body, rotor, and sliding vanes. Due to its simple structure, it is easy to manufacture and maintain, making it a popular choice among air compressors.
For the selection of air compressor oil, I recommend using specially designed air compressor oils, which typically have viscosity grades such as ISO VG 68 or 100. These oils can better handle the high pressure and high-temperature environment inside the compression chamber, providing effective lubrication, preventing carbon buildup, and resisting oxidation degradation. Synthetic oil is my top choice due to its high-temperature resistance and long lifespan, significantly reducing the frequency of oil changes. While conventional mineral oils are cheaper, they are prone to breakdown, which can increase maintenance costs. The type of compressor, such as reciprocating or screw-type, determines the optimal viscosity range. From my experience in repair cases, using automotive engine oil or low-quality oils incorrectly can accelerate component wear and even lead to leakage failures. Oil change intervals should be checked regularly, either every 200-300 operating hours or every six months, to ensure safe and efficient operation. In terms of maintenance, the oil filling quantity must strictly follow the equipment manual to avoid overfilling, which could increase the risk of internal pressure.
