What are the four major items of refrigeration in the cold storage refrigeration system?

What are the four major items of refrigeration in the cold storage refrigeration system? What does each of them do The first big piece: compressor Refrigeration compressors suck the low-temperature and low-pressure refrigerant vapor in the cold storage refrigeration system from the evaporator, and form high-temperature and high-pressure gas through compression. The refrigeration compressor is the main refrigeration equipment in the refrigeration system. Normal cold storage is selected. Generally, small refrigerators use fully enclosed compressors, such as Copeland, etc .; medium and large refrigerators use semi-closed compressors, such as Bitzer. The second largest piece: the condenser The condenser is used to cool the high-temperature and high-pressure gas refrigerant discharged from the refrigeration compressor and let it radiate heat, remove the temperature, and condense the gas refrigerant into a gas-liquid mixture under a certain pressure and temperature, in which most of the liquid. The third largest piece: expansion valve Expansion valve, also known as throttle valve, is used to decompress high-pressure refrigerant liquid and throttle expansion to low-temperature and low-pressure liquid. Fourth largest item: evaporator The evaporator absorbs the heat around the interior of the cold storage and evaporates through the expansion valve's throttled low-temperature and low-pressure refrigerant to achieve the purpose of cooling. Well, in a cold storage refrigeration system, these four major components can perform their duties properly, and can normally deliver refrigerant to the cooling equipment in the cold storage, and can make the refrigerant form a continuous circulation circuit in the system, so that the cold storage The temperature decreases, and the working condition of the cooling object is stable. With these four pieces, a refrigeration cycle can be formed, but in a complete refrigeration system, these are still not enough. Some auxiliary equipment should also be installed: gas-liquid separator, high pressure gauge, low pressure gauge, high and low pressure Control, oil separator, sight glass, filter, solenoid valve, oil pressure difference, etc. In order to be able to flexibly improve and adjust the refrigeration working conditions, so that the corresponding adjustments can be made when the working conditions change, and to ensure that the system is shut down in time when individual machines, equipment, and pipelines fail, to protect the damage of each equipment, only to make the operation It is easy to manage and guarantee the safety of operators and production.

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