The difference between oil-free screw air compressor and oil screw air compressor

There are significant differences between oil-free screw air compressors and oil-free screw air compressors in many aspects. These differences are mainly reflected in the lubrication method, exhaust oil content, material selection, service life, application field and maintenance cost. The following is a detailed analysis of these differences:

1. lubrication mode and exhaust oil content

• oil-free screw air compressor: Use resin material or water lubrication and other oil-free lubrication methods for lubrication, so the use of oil is not involved during operation. The gas discharged from this air compressor contains almost no oil, usually with very low oil content, and can even reach a completely oil-free state. This makes the oil-free screw air compressor in the need for high-purity compressed air occasions (such as food, pharmaceutical and other industries) has a significant advantage.
• Screw air compressor with oil: Oil lubrication is used to reduce friction, cool parts and seal rotor gaps. The gas discharged from this air compressor contains a certain amount of lubricating oil, which needs to be separated and purified by post-processing equipment (such as oil and gas separator). Although most of the lubricating oil can be separated, the exhaust gas may still contain trace amounts of oil.

2. Material Selection and High Temperature Resistance

• oil-free screw air compressor: Because it does not rely on oil lubrication, it pays more attention to high temperature resistance in material selection. For example, the rotor surface may be sprayed with modified Teflon material or other high temperature resistant coatings to ensure stable operation in high temperature environments.
• Screw air compressor with oil: Although high temperature resistant materials are also needed to support its operation, due to the existence of oil lubrication, the requirements for high temperature resistance of materials are relatively low.

3. service life and maintenance costs

• oil-free screw air compressor: Because oil-free lubrication reduces component wear caused by oil pollution and high temperature, it usually has a longer service life. At the same time, because there is no need to frequently replace consumables such as lubricating oil and filter elements, maintenance costs are relatively low.
• Screw air compressor with oil: Consumables such as lubricating oil and filter elements need to be replaced regularly to maintain its normal operation. This increases maintenance costs and can lead to increased downtime. In addition, oil contamination and high temperature may also cause increased wear of components, thereby affecting service life.

4. Application Areas

• oil-free screw air compressor because of its high purity and no oil pollution, it is widely used in food, medicine, electronics and other industries with high air quality requirements.
• Screw air compressor with oil: It is more suitable for general industrial fields, such as machinery manufacturing, automobile manufacturing, etc. In these areas, although there are certain requirements for air quality, a certain degree of oil pollution is usually acceptable.

5. working principle and structure

• oil-free screw air compressor: The water-lubricated air compressor of Shanghai Granklin Group is a single-rotor two-star wheel structure, which performs oil-free compression in the compression chamber. Air enters the compression chamber through the air inlet, is compressed and discharged during the rotation of the rotor. The whole process does not involve the use of oil, so the exhaust gas purity is high.
• Screw air compressor with oil: The working principle is similar to that of an oil-free screw air compressor, but an oil lubrication system is added. The oil lubricates, cools and seals during the compression process, but it also exits with the air and requires subsequent treatment.

In summary, there are significant differences between oil-free screw air compressors and oil-free screw air compressors in terms of lubrication methods, exhaust oil content, material selection, service life, application areas, and maintenance costs. When choosing an air compressor, the appropriate type should be selected according to the specific application requirements and scenarios.