What is an oil-free screw blower like?
Release date:
2022-12-12
As users’ requirements for the quality of compressed air sources continue to rise, oil-free screw blowers have found widespread application in industries with particularly high demands on compressed air quality—such as biotechnology, pharmaceuticals, electronics, food processing, healthcare, automotive, and chemical engineering. These industries have even stricter requirements for water, oil, dust, and bacteria.
As users’ requirements for the quality of compressed air sources increase, Oil-free screw blower It has been widely adopted in industries with high requirements for the quality of compressed air sources.
For example, in fields such as biology, pharmaceuticals, electronics, food processing, healthcare, automotive, and chemical engineering, the requirements for water, oil, dust, and bacteria are even higher. While moisture, dust, and bacteria in compressed air can be effectively addressed through a series of post-processing equipment—including filters and dryers—removing grease is considerably more challenging. However, there are some misconceptions about oil-free screw blowers. Let’s take a closer look below.
1. The compressed air produced by the oil-free screw blower is oil-free.
Although oil-free screw blowers do not use oil in the compression chamber and therefore never come into contact with compressed air, the oil vapor naturally present in the atmosphere cannot be completely removed, leaving a small amount of oil impurities in the compressed air. Measurements show that the oil content in the compressed air produced by oil-free screw blowers depends on the surface area and air mass, and the cleanliness of the blower room environment—specifically, the blower room environment, the blower room environment, the blower room environment, and the blower room environment—is closely related to the cleanliness of the compressor itself.
2. Oil-free screw blowers do not use oil.
Although oil is not used to come into contact with the air during the compression process, it is still used to cool the compressor and lubricate the moving parts, thereby ensuring the normal and stable operation of the oil-free screw blower.
3. Oil-free screw blower The compressed air produced is pollution-free.
The atmosphere contains numerous pollutants, including dust, water vapor, hydrocarbons, microorganisms, and more. Compressed air produced by oil-free screw blowers can only ensure that no oil is introduced into the compressed air during the compression process; however, it cannot remove impurities already present in the air itself. This means that compressed air generated by oil-free compressors is not necessarily free of contaminants. Using air treatment products can help reduce contamination to the required levels.
4. Oil-free screw blowers do not require air treatment products.
As mentioned in point 3, the gas quality of compressed air produced by oil-free screw blowers is largely influenced by environmental conditions. Users need to configure appropriate post-processing equipment based on their specific requirements for compressed air quality in order to meet their needs.
5. Oil-free screw blower Low cost.
In fact, because the compression ratio is much lower than that of oil-lubricated compressors, energy consumption is higher. For the same power output, an oil-free compressor produces more than 40% less air than an energy-efficient screw compressor. Although there’s no oil lubrication inside the compression chamber, other components—including lubricants in other parts and the air filter—still require regular maintenance. The rotors typically undergo special coating treatments, giving them a long service life. However, these compressors have high water requirements and are prone to damage if water quality is inadequate. Regular maintenance of the main unit is essential for oil-free engines; although this maintenance incurs higher costs—sometimes accounting for as much as 50% of the equipment’s total cost—it remains a necessary consideration.
For most users, there is no need to use Class 0 oil-free compressed air. What’s more important is addressing the contamination caused by oil impurities in water-removal equipment such as freeze dryers, non-thermal regenerative dryers, and micro-thermal regenerative dryers—thus preventing a decline in the efficiency of downstream processing equipment or even water loss altogether. For users who require Class 0 oil-free compressed air, it is difficult to consistently and reliably obtain oil-free compressed air by relying solely on oil-free screw blowers; therefore, it remains necessary to equip such systems with appropriate post-treatment oil-removal devices.
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