From the oil content point of view, oil-free and oil-free in compressor generally refer to the oil content of the gas discharged from the exhaust port of the compressor. Generally, the oil content of oil-containing compressor is larger, and the oil-free compressor has an oil content of 0.01ppm, so this oil content is used to distinguish between oil-free and oil-free compressors. There is also a completely oil-free compressor, which is not lubricated with oil, but lubricated with resin materials, so the gas discharged in the end does not contain oil and is called a completely oil-free compressor.
Key Takeaways
- Rotary screw machines dominate continuous-duty industrial use, while piston machines suit intermittent, lower-flow tasks.
- Oil-free technologies safeguard sensitive processes; oil-lubricated designs are economical where air purity is less critical.
- Compare discharge pressure, output flow, motor power, and footprint before selecting a specific model.
From a structural point of view, there is no difference between the bearings of oil-free compressors and oil-containing compressors. Nevertheless, from the working principle point of view, there are obvious differences between the two. There is no oil involved in the operation of oil-free compressors. Whether it is an oil-free piston machine or an oil-free screw machine, they will generate a lot of high temperature during operation. If it is an oil-free compressor, the participation of oil will take away the high temperature generated during the compression process of the compressor, thereby cooling the machine.
Nevertheless, oil-free compressors do not use oil, and they also generate a lot of high temperature during the compression process. How to solve the high temperature and guarantee the normal operation of the machine? In fact, a special high-temperature resistant material called Teflon or molybdenum disulfide is used inside the oil-free compressor to replace oil to solve the high temperature during the compression process of the compressor, thereby achieving the purpose of oil-free compression.
Oil-free compressors are cleaner and more environmentally friendly to a certain extent than oil-containing compressors. For this reason, institutions such as hospitals, laboratories, and schools are very suitable for the use of oil-free compressors, and these institutions also prefer to use oil-free compressors.
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Normal working life of compressors
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Selection and Sizing Considerations
Rotary screw machines dominate continuous-duty industrial use, while piston machines suit intermittent, lower-flow tasks. Oil-free technologies safeguard sensitive processes; oil-lubricated designs are economical where air purity is less critical. Compare discharge pressure, output flow, motor power, and footprint before selecting a specific model.
Frequently Asked Questions
What is the main advantage of a screw compressor?
It delivers continuous, stable air flow with low vibration and is ideal for round-the-clock industrial operation.
When is a reciprocating compressor the better choice?
For intermittent use, high-pressure applications, or lower initial budgets, piston compressors remain a practical option.
What does two-stage compression enhance?
Two-stage compression reduces the compression ratio per stage, improving efficiency and lowering discharge temperature.
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