Compressors can be divided into volumetric compressors and velocity compressors according to their principles. Volumetric compressors are divided into reciprocating compressors and rotary compressors; Speed compressors are divided into axial compressors, centrifugal compressors, and mixed flow compressors.
Various reciprocating compressors are generally classified into open, closed, and semi closed compressors based on the form of the compressor housing. Closed type refers to the entire compressor being housed within a single casing.
According to the application scope, it can be divided into low back pressure type, medium back pressure type, and high back pressure type. Low back pressure (evaporation temperature -35~-15 ℃) is generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -20~0 ℃) is generally used in cold drink cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -5~15 ℃) is generally used for room air conditioners, dehumidifiers, heat pumps, etc.
There are five types of compressors used in the refrigeration and air conditioning industry: reciprocating, screw, rotary, scroll, and centrifugal. Among them, reciprocating compressors are the most commonly used type of compressor in small and medium-sized commercial refrigeration systems. Screw compressors are mainly used in large commercial and industrial systems. Rotary compressors and scroll compressors are mainly used in household and small capacity commercial air conditioning units, while centrifugal compressors are widely used in air conditioning systems for large buildings.
