Compressor) is a driven fluid machine that promotes low pressure gas to high pressure gas and is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it by running the motor, and then discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle.
Thereby a refrigeration cycle of compression→condensation (exothermic)→expansion→evaporation (endothermic) is achieved. Compressors are classified into piston compressors, screw compressors, centrifugal compressors, and linear compressors. The terms describe the working principle, classification, accessories, specifications, operation requirements, compressor production, common faults and environmental requirements, selection principles, installation conditions and development trends of the compressor.
The compressor is considered to be the heart of the refrigeration system, and the term "vapor pump" is the most common term for compressor characteristics. The actual position of the compressor
The responsibility is to increase the pressure and increase the state of the suction pressure to the exhaust pressure state.
The compression ratio is a technical representation of the pressure difference, which means the absolute pressure on the high pressure side divided by the absolute pressure on the low pressure side. The compression ratio must be calculated using absolute pressure values. In order to avoid negative values in the calculated compression ratio, absolute pressure must be used instead of gauge pressure when calculating the pressure ratio. It makes sense to use absolute pressure values to make the compression ratio a positive value.
There are five types of compressors used in the refrigeration and air conditioning industry: reciprocating, screw, rotary, scroll and centrifugal. Reciprocating is the most widely used compressor in small and medium 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 conditioners, and centrifugal compressors are widely used in air conditioning systems in large buildings.
Various reciprocating compressors are generally classified according to the form of the compressor housing and the manner in which the drive mechanism is arranged. Open and closed semi-hermetic compressors are available depending on the form of the housing. Closed means that the entire compressor is placed in a single housing.