2026-04-09Views：
Dry oil-free air compressors are oil-free, and water-lubricated air compressors of the same type can be referred.
No oil and water lubrication air compressor, pay attention to a few points:
the lubrication part is water, and it is pure water, preferably pure water;
2, absolutely does not contain oil, but contains water;
3. Water-lubricated air compressors are single-screw air compressors, which are not a bit cheaper than dry oil-free machines.
More than 90kw, it is best to use water-cooled; water-cooled air compressor, whether it is oil-free or oil-free, need to build a simple water tower for cooling, of course, the cooling effect should be strictly better than air-cooled.
What are the differences between dry oil-free machine and water-lubricated oil-free machine?
The dry-type oil-free machine is a twin-screw air compressor. There is no lubrication in the compression cavity of the oil-free screw machine. There is only lubricating oil in the gear box, which can be said to be dry. The surface of the rotor is specially coated, and the male and female rotors do not really touch. Because there is no contact, the first compression pressure is not very high. To increase the pressure, use two-stage compression.
Compression effect is better isothermal compression, the actual can not do isothermal compression, so after the first stage of compression there is an intermediate cooler and trap (cooling, drainage), the second stage of compression also has a rear cooler. The pressure of the first stage of compression is about root number 2, and then this pressure enters the second stage of compression. Due to the high speed and high temperature in the head, the head shell is a one-time lost foam technology for cooling. The nose housing is completely separate from the rotor. If air-cooled, the shell is oil-cooled; if water-cooled, the shell is water.
The maintenance price of screw air compressor varies due to factors such as brand, model size, power, and accessories that need to be replaced. Generally speaking, the maintenance cost of imported brands will be higher than that of domestic brands, because the price of imported accessories is more expensive and the maintenance time is relatively long.
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