What is an Dry Oil Free Compressor?

The working principle of oil free compressor is mainly to compress the sucked air through mechanical parts such as piston, screw or turbine, and then output it as high-pressure gas. In this process, oil is not used as lubricating or cooling medium in the compression chamber, so the oil does not come into direct contact with the compressed air.

Features of Oil Free Compressor

1. Relatively High Speed

Dry oil free compressor can be used as air compressor or process compressor, and there is no liquid internal cooling and lubrication during the compression process. Since there is no oil in the compression chamber for lubrication and sealing, the two rotors of the dry oil-free screw compressor cannot be in direct contact, and a certain gap needs to be maintained between them to reserve for the thermal expansion of the rotors, so there will inevitably be a large leakage. To compensate for the leakage loss, the male rotor drives the female rotor to rotate at high speed through the synchronous gear. The synchronous gear not only transmits power, but also ensures the gap between the rotors.

2. Small Pressure Ratio

The gap between the rotors also leads to the problem of small single-stage pressure ratio. At present, the single-stage pressure ratio of dry oil free compressors is generally 1.5~3.5. Therefore, dry oil-free screw compressors are usually two-stage compression, with a compression ratio of 8~10, an exhaust pressure of less than 2.5MPa, and a common volume flow rate of 3~100m’/min.

3. High Exhaust Temperature

Since there is no liquid in the compression chamber for internal cooling, the oil free compressor can only control the exhaust temperature through indirect cooling, resulting in a relatively high exhaust temperature of the compressor, usually 160℃~200℃, and generally 230℃ and 240℃ are high temperature protection limits.

4. High Requirements for Bearings and Shaft Seals

The dry oil free air compressor compression chamber requires no oil, so the requirements for sealing measures such as shaft seals are high. At the same time, the compression chamber temperature is high and the unit speed is high, which also has high requirements for bearings.

Advantages

• High Compressed Air Quality

Since no oil is used in the compression chamber, the output compressed air quality is high and does not contain oil and other impurities. This makes oil free compressors have a wide range of application prospects in industries that require high-quality compressed air, such as food and medical.

• Low Operating Cost

Since no lubricating oil is required, the operating cost of oil free air compressors is relatively low. At the same time, due to the reduction of lubricating oil consumption and pollution problems, the maintenance workload of the equipment is also reduced.

• Stable and Reliable Performance

Oil free compressors usually use special designs and technologies to ensure the stability and reliability of the equipment. This allows it to maintain good performance in long-term continuous operation and harsh environments.

Disdvantages

• High Energy Consumption

Since the compression ratio of oil-free air compressors is relatively small, their energy consumption is usually high. This increases the operating costs of enterprises and may have a certain impact on the environment.

• High Maintenance Costs

Although the operating cost of oil-free air compressors is low, due to their complex structure and high precision requirements for components, the maintenance costs are usually high. Once the equipment fails or is damaged, it may take a long time and high costs to repair it.

• High Exhaust Temperature

Since oil free compressors will generate a high temperature rise during operation, special designs and technologies are required to ensure their stability and reliability. This also increases the complexity and manufacturing cost of the equipment.

Application Areas

Food and Beverages: Oil-free air compressors are widely used in food packaging, processing and storage. The oil-free compressed air it provides can ensure the hygiene and safety of food and avoid the contamination of food by lubricating oil.
Medical Industry: In the medical industry, oil free compressors are used to provide high-quality compressed air to support the work of various medical equipment. For example, it can be used in the air supply system of ventilators, the air purification system of operating rooms, etc.
Electronic Manufacturing: In the production of semiconductors and electronic components, it is crucial to avoid oil pollution.
Other Industries: In addition to the above fields, oil-free air compressors are also widely used in many industries such as automobile manufacturing, chemical industry, textile, printing and dyeing. The oil-free compressed air it provides can meet the needs of these industries for high-quality compressed air.

Summary

Oil free compressor is an efficient and environmentally friendly air compression equipment with broad application prospects and market demand. Although it will generate certain energy consumption and maintenance costs during operation, its high-quality compressed air and stable performance make it widely used and recognized in many fields.

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