2026-04-10Views：
Oil-free screw machine and micro-oil screw machine are not the same thing, they have significant differences in working principle, structure and application.
Working principle and structure:
oil-free screw machine: no contact with oil during compression. There is no direct contact between the rotors, there is a certain gap, and it relies on synchronous gears for transmission to ensure the gap between the rotors. At the same time, the shaft seal structure at the intake and exhaust ends completely isolates the medium gas from the bearing lubricating oil.
Micro-oil screw machine: Using oil injection technology, lubricating oil will be injected into the compression chamber during the compression process to play the role of lubrication, sealing, cooling and noise reduction. The rotor usually meshes directly, does not rely on synchronous gear transmission, and the lubricating oil will participate in the entire compression process.
Scope of application and applicability:
oil-free screw machine: especially suitable for places with high air quality requirements, such as food, medicine, semiconductor and other industries. Since there is no lubricating oil involved in the operation of the oil-free screw machine, the compressed air produced is more pure.
Micro-oil screw machine: It is favored for its good lubrication effect and wide applicability. It can operate stably in high temperature, high humidity or dust environment, and is suitable for various industrial environments. However, the compressed air produced may contain traces of oil.
In summary, there are obvious differences between oil-free screw machine and micro-oil screw machine in terms of working principle, structure and application range. Which type of screw machine to choose depends on the specific application needs and scenarios.
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