Compressors can be divided into volumetric compressors and speed compressors according to their principles. The volume type is further divided into: reciprocating compressors and rotary compressors; speed compressors are further divided into: axial compressors, centrifugal compressors and mixed flow compressors.
Today's domestic refrigerators and air conditioner compressors are all volumetric, which can be divided into reciprocating and rotating. Reciprocating compressors use pistons, cranks, linkages or pistons, cranks, and slide tubes. Rotary-type compressors are mostly used. In commercial air conditioners, many are centrifugal, scroll, and Screw.
According to the scope of application, it can be divided into low back pressure type, medium back pressure type and high back pressure type. Low back pressure type (evaporation temperature -35 ~ -15 °C), generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -20 ~ 0 °C), generally used in cold drinks cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -5 ~ 15 °C), generally used for room air conditioners, dehumidifiers, heat pumps, etc.
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