Rotary CompressorsSmall rotary comp

Rotary CompressorsSmall rotary compressors for room air conditioners and refrigerators have a capacity up to 4 tons. Thereare two types of rotary compressors: rolling piston and rotating vane. A typical rolling piston rotarycompressor is shown in Figure 9.8.1(c). A rolling piston mounted on an eccentric shaft is kept in contactwith a fixed vane that slides in a slot. Vapor refrigerant enters the compression chamber and is compressedby the eccentric motion of the roller. When the rolling piston contacts the top housing, hot gas is squeezedout from the discharge valve.Screw CompressorsThese are also called helical rotary compressors. Screw compressors can be classified into single-screwcompressors, in which there is a single helical rotor and two star wheels, and twin-screw compressors.Twin-screw compressors are widely used.