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

The difference between oil-free screw air compressor and oil-free air compressor is mainly reflected in the following aspects:

1. working principle

1. screw air compressor with oil:

   • lubrication and cooling: In the compression process, the lubricating oil participates in the compression, which plays the role of lubricating the running parts in the main engine, and at the same time takes away the high temperature generated by the compression to help dissipate heat.
   • Oil and gas separation: The compressed oil and gas mixture will be separated in the oil and gas separation barrel. After the separated compressed air is recovered by the secondary oil return pipe, its oil content will be less than 5PPM (that is, micro-oil screw air compressor).

2. Oil-free screw air compressor:

   • oil-free compression: During the compression process, no oil participates in the compression of air. Special temperature-resistant materials such as molybdenum disulfide or Teflon are used on the screw to overcome the high temperatures generated during compression, rather than oil.
   • bearing lubrication: Although the host bearing also needs cooling and lubrication, this part of lubrication is separated from the compression process and will not affect the purity of the compressed air.

2. gas purity

1. screw air compressor with oil:

   • oil content: Because lubricating oil participates in the compression process, the output compressed air contains a certain amount of oil, which is suitable for industries that do not have strict air requirements.

2. Oil-free screw air compressor:

   • no oil pollution the output compressed air is oil-free and has high purity, especially suitable for occasions with high gas quality requirements, such as food and pharmaceutical production.

3. maintenance and use costs

1. screw air compressor with oil:

   • lubricating oil replacement: The lubricating oil needs to be replaced regularly, which increases the maintenance cost.
   • Oil requirements: High requirements for the quality of lubricating oil, otherwise it will affect the performance of the equipment.
   • Cost of use: The technology is mature, the production cost is low, and the market price is relatively close to the people.

2. Oil-free screw air compressor:

   • no need for lubricating oil: No need to replace lubricating oil regularly, reducing operating costs.
   • Simple maintenance: Due to the oil-free design, the failure caused by oil pollution is reduced, and the maintenance cost is relatively low.
   • Cost of use: Due to higher technical and material requirements, the initial investment will be relatively large.

4. performance characteristics

1. screw air compressor with oil:

   • good lubrication performance: Lubricating oil can effectively reduce mechanical wear and extend service life.
   • Good sealing performance: Lubricating oil can effectively reduce gas leakage and improve compression efficiency.
   • Noise level: Due to the buffering effect of lubricating oil, the noise level is relatively low.

2. Oil-free screw air compressor:

   • environmental protection and energy saving: The oil-free design reduces the use of lubricating oil, does not produce waste oil, and is environmentally friendly.
   • Compact structure: Usually adopt a more concise design, small size, light weight, easy to install and move.
   • Noise level although the oil-free design may increase the friction between mechanical parts, the noise level can also be controlled in a lower range by optimizing the design and adopting noise reduction measures.

5. scope of application

1. screw air compressor with oil:

   • conventional Industrial Applications: Due to its lubrication system, it is suitable for continuous high-intensity work or large industrial facilities.
   • The air is not strict requirements of the occasion such as iron and steel, electric power, hardware, mining, ceramics, textile, machinery and other industries.

2. Oil-free screw air compressor:

   • high quality air requirements: Such as food, pharmaceutical, medical and other industries with high requirements for compressed air quality.
   • Precision manufacturing or experimental environments: Where lubricant contamination needs to be avoided.

6. Other Considerations

1. heat dissipation problem of oil-free screw air compressor:

   • due to the oil-free design, when the oil-free screw air compressor works under high load, the heat dissipation effect may not be as good as that of the oil-free air compressor. Therefore, it is necessary to pay attention to the temperature control of the use environment to ensure the normal operation of the equipment.

2. Technical Challenges of Oil-free Screw Air Compressor:

   • oil-free screw air compressor needs to use special high temperature resistant materials to solve the high temperature problem in the compression process, and it is necessary to ensure that the lubrication space of the rotor bearing and the compression space of the rotor are sealed. This increases the processing accuracy and cost of the equipment, and also puts forward higher requirements for maintenance.

Generally speaking, oil-free screw air compressor and oil screw air compressor have their own advantages and disadvantages. Users should comprehensively consider equipment performance, operating cost, maintenance and other factors according to actual needs when choosing. For pharmaceutical companies and other occasions with high quality requirements for compressed air, oil-free screw air compressor is undoubtedly a more suitable choice.