2026-04-09Views：
The main difference between oil-free piston air compressors and oil-injected air compressors is reflected in their working principle, lubrication method and the quality of the compressed air produced.
oil free piston air compressor:
working principle: Oil-free piston air compressor compresses air through the reciprocating movement of the piston in the cylinder. The key is that no lubricating oil is used during the entire compression process, thus ensuring that the compressed air produced is completely oil-free.
Lubrication method: Because no lubricating oil is used, oil-free piston air compressors usually use special materials and designs to reduce friction and wear.
Compressed air quality: The compressed air produced by the oil-free piston air compressor is pure and oil-free, and is suitable for applications with strict requirements on air quality, such as food, medicine and other industries.
Oil injection air compressor (usually refers to oil screw air compressor or similar models):
working principle: The oil-injected air compressor uses lubricating oil to cool, seal and lubricate the moving parts during the compression process. The lubricating oil mixes with the air and separates most of the oil in the subsequent oil-gas separation process.
Lubrication mode: oil injection air compressor through the injection of lubricating oil into the compression chamber to achieve lubrication and cooling.
Compressed air quality: Although the oil injection air compressor uses lubricating oil in the compression process, the oil content in the compressed air can be controlled within a certain range through an efficient oil and gas separation system. However, compressed air still contains traces of oil.
shanghai granklin group product description:
shanghai Granklin Group provides a variety of types of air compressors to meet the needs of different customers.
Water-lubricated air compressor: Use water as the lubricating medium, run without oil, and the compressed air produced is pure and oil-free.
Oil-free air compressor: adopts oil-free piston or screw technology to ensure that the compressed air produced is completely oil-free.
Variable frequency air compressor: equipped with variable frequency drive, adjust the motor speed according to actual needs to achieve energy efficiency optimization.
Screw air compressor: including oil-free and oil-injected two types, providing efficient and stable compressed air output.
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