What are the common materials for screw air compressor rotors?

 

As the name suggests, oil-free screw compressors do not have lubricating fluid for lubrication during the process of compressing air. Tiny particles in the air and the gas itself will corrode the rotor and the inside of the body. Therefore, compared with traditional oil-injected screw compressors, oil-free screw compressors will spray an anti-corrosion layer on the rotor, and the material of the rotor also needs to be carefully selected. The selection of rotor materials generally includes the following.

1.Polymer polymer ceramic rotor

 

The machining accuracy of polymeric ceramic rotors can be accurate to a few hundredths of a millimeter. A large number of experiments and long-term applications have proven that this material has good wear resistance and high stability, so it has a wide range of application scenarios.

 

2. Engineering plastic rotor

The precision injection-molded engineering plastic rotor will not rust, is low-cost, and reduces the noise and vibration of the screw compressor. The use of engineering plastic rotors has opened up a new economic approach to screw compressor rotor materials and processing methods, providing conditions for the use of water spray seal cooling technology in the compression chamber, and promoting technological improvements and updates in screw compressors.

 

3.NSB steel rotor

 

NSB steel is a nickel-phosphorus alloy that can withstand corrosion from acidic gases and is often used to compress gases such as hydrogen and sulfur dioxide.

4. Screw rotor profile

 

The profile design of the screw rotor is crucial to the screw compressor. Good profile design can reduce lateral leakage through the contact line and improve compressor efficiency. It can also improve the processing performance of the rotor, reduce wear and extend the life of the entire machine.