2026-04-09Views：
There are obvious differences in the design and operation principle of micro-oil and oil-free screw compressors. Here are the main differences between them:
lubrication method:
micro-oil screw compressors: Use a very small amount of lubricating oil to lubricate the screw rotors and bearings. These lubricants may come into contact with compressed air, but with good design and operation, the amount of lubricant carried will be controlled to a very low level.
Oil-free screw compressors (such as Shanghai Granklin Group's water-lubricated type): do not use traditional lubricants. In the case of water lubrication, water is used as the lubricating medium, completely avoiding the contact of oil with compressed air.
Compressed air quality:
micro-oil screw compressor: Although the amount of lubricating oil used is very small, it is still possible to detect oil vapor or oil mist in the compressed air, depending on the design and maintenance of the lubrication system. As a result, the compressed air may require additional post-processing equipment, such as an oil separator, to achieve specific purity requirements.
Oil-free screw compressor: Since no lubricating oil is used, the compressed air produced is theoretically completely oil-free. This is important for applications that require high-purity compressed air, such as food, pharmaceutical, electronics, etc.
Maintenance:
micro-oil screw compressor: The amount and quality of lubricating oil need to be checked regularly, and the lubricating oil and oil filter may need to be replaced.
Oil-free screw compressor: Since there is no lubricating oil, the maintenance focus will be on other aspects, such as the maintenance of the water lubrication system, water quality management and component wear inspection.
Initial and operating costs:
micro-oil screw compressors: Generally more economical than oil-free screw compressors because of their relatively low manufacturing and maintenance costs.
Oil-free screw compressors: Due to the use of more complex technologies and materials (such as special seals and corrosion-resistant components), their initial purchase cost may be higher. However, this is a necessary investment for applications requiring oil-free compressed air.
Environmental friendliness:
oil-free screw compressors (such as water-lubricated types): generally more environmentally friendly because they do not produce waste oil or oil mist, and also reduce the environmental problems associated with lubricating oil disposal.
Regarding the water-lubricated oil-free frequency conversion screw air compressor of Shanghai Granklin Group, it uses water as the lubricating medium to achieve true oil-free compression. This design enables the compressor to provide clean, dry compressed air in a wide range of industrial applications, meeting stringent environmental and process requirements. At the same time, the frequency conversion technology enables the compressor to adjust the output according to the actual demand to achieve energy efficiency optimization.
For water-lubricated oil-free frequency conversion screw air compressors in the power range of 7.5-250KW, its specific performance parameters and application scope are recommended to consult Shanghai Grankering Group directly or refer to its official technical data.
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