The difference between dry oil-free screw machine and oil injection machine

There are significant differences between dry oil-free screw machine and oil jet machine in many aspects. The following is a detailed analysis of the main differences between the two:

1. working principle

1. dry oil-free screw machine:
   • working principle: Compress the gas by two rotating screws (master screw and slave screw). During the compression process, the gap between the screws gradually decreases, compressing the air and pushing it to the outlet. This air compressor does not involve any lubricating oil during operation, so the output compressed air is very pure.
   • Features: Simple structure, no lubrication system and fuel tank, reducing maintenance costs and failure rate. Special coatings and materials are used to reduce friction and heat dissipation.
2. fuel injection machine:
   • working principle: In the context of this article, an oil injector usually refers to an oil-injected screw air compressor or other equipment that reduces friction and cooling by spraying lubricating oil. It reduces friction and heat accumulation by injecting lubricating oil into the compression chamber or key parts, thereby ensuring the normal operation of the equipment.
   • Features: Need to be equipped with a lubrication system and fuel tank to regularly replace and replenish lubricating oil. Its working principle depends on the circulation and injection of lubricating oil.

2. Application Areas

1. dry oil-free screw machine:
   • applicable occasions: Because its output compressed air is pure and oil-free, it is suitable for occasions with extremely high air quality requirements, such as food processing, medicine, biopharmaceuticals, precision spraying and other industries.
   • Advantage: In these occasions, the oil-free screw machine can avoid the pollution of the lubricating oil to the product and ensure the hygiene and safety of the production process.
2. fuel injection machine:
   • applicable occasions: Fuel injection machines are usually suitable for occasions where air quality requirements are not particularly high, such as refrigeration, air conditioning, general industrial applications, etc.
   • Advantage: The cost is relatively low, the maintenance is relatively simple, and in some applications, the circulation and injection of lubricating oil help the cooling and lubrication of the equipment and extend the service life of the equipment.

3. performance and characteristics

1. dry oil-free screw machine:
   • performance: It usually has a long service life (up to 10 years or more), because it does not require the intervention of lubricating oil, which reduces the wear and failure rate of the equipment.
   • Features low noise, low vibration, stable and reliable operation. At the same time, because there is no need for a lubrication system, the equipment structure is more compact and the area is small.
2. fuel injection machine:
   • performance: The service life is relatively short (usually about 5 years), because the lubricating oil needs to be replaced regularly and the lubrication system needs to be maintained.
   • Features: The cost is low, but the maintenance cost is relatively high (including lubricating oil replacement and system maintenance). In some applications, additional oil and gas separation equipment may be required to ensure the quality of the output air.

4. Summary

there are significant differences between dry oil-free screw machine and oil injector in working principle, application field, performance and characteristics. When choosing, users should consider comprehensively according to their actual needs and budget. For occasions that require high cleanliness of compressed air, such as food processing, pharmaceutical and other industries, dry oil-free screw machine is a more appropriate choice; and for general industrial applications or air quality requirements are not particularly high occasions, the oil injection machine It may be more economical and practical.