What is the difference between oil-free screw and micro-oil screw?

The difference between oil-free screw and micro-oil screw air compressor is mainly reflected in the following aspects:

working principle and structure:

the oil-free screw air compressor does not contact with oil at all during the compression process. 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.

The micro-oil screw air compressor adopts oil injection technology. During the compression process, lubricating oil will be injected into the compression chamber 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 air compressor is completely isolated from the medium gas and lubricating oil, which is especially suitable for places with high air quality requirements, such as food, medicine, semiconductor and other industries. In addition, because there is no lubricating oil involved in the operation of the oil-free screw air compressor, the compressed air produced is more pure.

Micro-oil screw air compressor is favored because of 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, which is not suitable for scenarios with extremely high air quality requirements.

Maintenance cost and convenience:

oil-free screw air compressors usually have lower maintenance costs due to the avoidance of lubricating oil systems. Its structure is simple and the maintenance process is relatively easy. However, it should be noted that the purchase cost of oil-free screw air compressors may be higher, and there are certain requirements for the working environment such as temperature, humidity and dust.

The micro-oil screw air compressor requires regular replacement of lubricating oil to maintain the normal operation of the machine, which increases the complexity of maintenance work. However, its manufacturing costs and maintenance costs are relatively low, making the micro-oil screw air compressor competitive in the market.

In summary, the difference between oil-free screw and micro-oil screw air compressor is mainly reflected in the working principle, application scope and maintenance cost. Which type of air compressor to choose depends on the specific application scenarios and needs.