Oil-free lubricating compressors Polyimine characteristics Piston ring structure In order to meet the requirements of oil-free compressed gas, the application of oil-free lubricating compressors is becoming more and more widespread. The fundamental difference between an oil-free lubricating compressor and an oil-lubricated compressor is that there is no lubricating oil in the cylinder. The operating environment of the piston ring has undergone an essential change, that is, a non-metallic material with self-lubricating is used instead of a cast iron piston ring. When it is ground against the cylinder, a Transfer film is formed on the metal surface of the friction pair by its own lubricity instead of the lubricating oil film. The key factors affecting the operating cycle of an oil-free lubricating compressor are the choice of piston ring material and the determination of the ring structure parameters.
Oil-free lubricating materials refer to all solids that can achieve a low coefficient of friction without the use of lubricants, such as graphite, disulfide, nylon, polytetrafluoroethylene, and the like. These composite materials are mainly made of plastic, metal and ceramics, and are mixed with materials such as graphite, glass fiber, carbon fiber, metal powder and metal fiber.
From the metallographic structure of the material, nylon is the continuous phase, the lubricating oil is the dispersed phase, and is uniformly and stably distributed on the nylon substrate. When the oil-containing nylon part rubs against the grinding part, a lubricating oil film is formed to isolate the direct contact friction between the nylon piston ring and the cylinder surface, thereby reducing the friction coefficient. Nylon itself has the advantages of good wear resistance, low friction coefficient, high mechanical strength, etc., and further increases the self-lubricity and wear resistance of oil-containing nylon by adding a certain proportion of fillers such as disulfide, graphite and talc. Properties such as sex and resistance to heat deformation.
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