Oil-free air compressors are lubricated in two core ways to ensure efficient equipment operation and pure oil-free output air:
1. Self-lubricating material technology
principle:
key moving parts (e. g. piston rings, cylinder walls) are made of special materials that automatically form a lubricating film when rubbed against each other, reducing direct contact and wear.
Common Materials:
- filled PTFE: Adding glass fiber, graphite and other fillers to pure PTFE to improve wear resistance and thermal conductivity, widely used in piston rings and sealing rings.
- Polyamide (Nylon): High mechanical strength, but limited heat resistance, suitable for low temperature scenarios.
- metal-plastic composite: Combined with metal skeleton and fluorine plastic, both strength and self-lubrication, suitable for high pressure difference environment.
Application Scenarios:
in a miniature reciprocating piston compressor, the piston ring is in direct contact with the aluminum alloy cylinder wall through a self-lubricating material without adding additional lubricant.
2. Water lubrication technology
principle:
replace traditional lubricating oil with pure water or softened water, and realize lubrication, heat dissipation and sealing functions through the flow of water.
Technical Details:
- water circulation system: Water is injected into the compression chamber to form a water film on the surface of the screw or piston to reduce friction.
- Anti-corrosion design: The key components are made of special stainless steel to prevent corrosion caused by long-term contact with water.
- water quality management: Regular replacement or purification of water is required to avoid impurities affecting the lubrication effect.
Advantage:
- the output air is completely oil-free, suitable for food, medicine and other industries with strict air quality requirements.
- The specific heat capacity of water is large, and the heat dissipation efficiency is higher than that of traditional lubricating oil, which helps the stable operation of the equipment.
Other Assistive Technologies
- coating technology: Spray a superhard coating (such as titanium nitride) on the surface of the rotor or piston, and form a wear-resistant layer through physical vapor deposition (PVD) to reduce friction.
- precision machining: Reduce friction requirements between components through high-precision machining and indirectly reduce lubrication dependence.
Summary
through self-lubricating materials, water lubrication, coating technology and structural optimization, the oil-free air compressor realizes clean operation without traditional lubricating oil. These technologies not only meet the needs of high-purity air, but also reduce maintenance costs and environmental impact. They are typical solutions for modern industry's needs for efficient and environmentally friendly equipment.
