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The compressor is the heart of the refrigeration system. It sucks low-temperature and low-pressure refrigerant gas from the suction pipe, compresses it by driving the piston through the operation of the motor, and discharges high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle. Thus, a refrigeration cycle of compression→condensation→expansion→evaporation (heat absorption) is realized. The compressor is generally composed of a casing, an electric motor, a cylinder, a piston, control equipment (starter and thermal protector), and a cooling system. There are two cooling methods: oil cooling and natural cooling. The compressors of general household refrigerators and air conditioners use single-phase alternating current as a power source, and their structural principles are basically the same. The refrigerant used by the two is different. Types of refrigerator compressors Currently household refrigerators are volumetric, which can be divided into reciprocating and rotating. The reciprocating compressor uses a piston, crank, connecting rod mechanism or piston, crank, slide tube mechanism, and the rotary type uses a rotating shaft crank mechanism. According to the application range, 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℃), generally used in household refrigerators, food freezers, etc. Medium back pressure type (evaporation temperature -20-0℃), generally used in cold drinks cabinets, milk refrigerators, etc. High back pressure type (evaporation temperature -5-15℃), generally used in room air conditioners, dehumidifiers, heat pumps, etc.
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