Two screw compressors

Two-screw is the most common type screw compressor used today. He uses a double set of rotors (male and female) to compress the refrigerant gas. Male rotor usually has four blades. Female rotor consists of six petals. As a rule, this is called 4 - + 6 agreement. However, some compressors, especially air conditioners use other options, such as 5 + 7.