How to choose screw air compressor with or without oil

How to choose screw air compressor with or without oil

In screw air compressors, they are classified according to the type of lubrication, which are mainly divided into two types: oil lubrication and no oil. Literally, it is easy to understand whether or not air compressor lubricants are needed. But from the practical application point of view, what industries are oil-lubricated air compressors used in? Under what circumstances should oil-free lubrication be considered?

　　 First of all, to choose the lubrication method of the screw air compressor, it must be determined by combining the industry and the actual working conditions. Just like the choice of piston machine, screw machine, centrifuge and some occasions such as food, medicine, precision instrument and other industries, you must use a completely oil-free air compressor. However, oil-free air compressors are much more expensive and more expensive to maintain.

　　 If it is used for purging, machining, manufacturing, and power use, you can choose an air compressor with oil or light oil. Such as spraying, steel, electricity, hardware, mining, ceramics, textiles, machinery, etc. are widely used.

The definition of oil and non-oil in the air compressor generally refers to the oil content of the exhaust gas of the air compressor. Generally, the oil content of the air compressor is larger, and the oil content of the oil-free machine is 0.01ppm, so use This oil content is used to distinguish the air compressor with and without oil.

　　 Nowadays, centrifugal air compressors are used for air compressors with large displacement and no oil.

　　 One is to use water instead of oil, and the other is to plate a self-lubricating coating on the rotor (not oil lubrication, but resin lubrication). Because the bearings at both ends of the rotor need oil lubrication, the lubrication space of the rotor bearing and the compression space of the rotor need to be sealed with each other. It is precisely because of this high-speed seal that the oil-free air compressor requires a relatively high machining accuracy. The cost is also great.

Once the main engine head of an oil-free air compressor fails, because it is too precise, the main engine head can only be repaired by the manufacturer, which greatly increases the irreparability.

Even if it can be repaired, it requires a huge amount of money and a long repair time. .

　　At present, the quality and stability of this type of air compressor are not very satisfactory. The domestic ones are generally oil-lubricated and oil-free. Therefore, it is not a large-scale enterprise, or has special requirements, and must be completely oil-free. It is best not to buy an oil-free air compressor blindly. Looking for a good brand and professional technical personnel, combined with their own industry and actual use, understand the advantages and disadvantages, and make selection judgments.