The difference between oil-free screw and oil-free screw air compressor is mainly reflected in the following aspects:
Working principle and structure:
The oil-free screw air compressor is not in contact with the oil at all during the compression process. There is no direct contact between the rotors, there is a certain clearance, and it relies on synchronous gears for transmission to ensure the clearance 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 oil.
The oil screw air compressor adopts oil injection technology, and lubricating oil will be sprayed into the compression cavity during the compression process, which plays the role of lubrication, sealing, cooling and noise reduction. The rotor is usually directly engaged, does not rely on synchronous gearing, and the lubricant is involved throughout the compression process.
Scope of application and applicability:
The oil-free screw air compressor is completely isolated from the lubricating oil due to the medium gas, which is especially suitable for places with high air quality requirements, such as food, medicine, semiconductor and other industries. In addition, the compressed air produced by the oil-free screw compressor is purer because there is no lubricating oil involved in the operation.
The 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 dusty environment, and is suitable for various industrial environments. However, the compressed air produced may contain trace amounts of oil, making it unsuitable for scenarios with extremely high air quality requirements.
Maintenance Cost & Convenience:
Oil-free screw air compressors usually have low maintenance costs due to the elimination of lubricating oil systems. Its structure is simple, and the maintenance process is relatively easy. However, it should be noted that the acquisition cost of oil-free screw air compressors may be high, and there are certain requirements for the working environment such as temperature, humidity and dust.
Oil-screw compressors need to change the lubricating oil regularly to keep the machine running, which adds to the complexity of maintenance work. However, its manufacturing cost and maintenance cost are relatively low, making the micro-oil screw air compressor competitive in the market.
To sum up, the difference between oil-free screw and oil-free screw air compressor is mainly reflected in the working principle, application scope and maintenance cost. The type of compressor you choose depends on your specific application and needs.