Analysis of freezer refrigeration system

1. compressor: imported compressor is adopted, which is divided into built-in compressor and external compressor. Built-in compressor is generally fully enclosed. The compressor is the refrigeration cycle system'Heart' Its function is to transport and compress the refrigerant vapor under the drive of the motor, so that the refrigerant can carry out refrigeration cycle in the system. Second, condenser: condenser, also known as radiator, is the main heat exchange equipment in freezer refrigeration system. The function of the condenser is to transfer the high-temperature and high-pressure refrigerant vapor discharged from the compressor to the surrounding air through heat transfer in the condenser, so that the refrigerant vapor is cooled and then liquefied into liquid. Three, freezer capillary has two functions: ① keep a certain pressure difference between condenser refrigerant and evaporator refrigerant to ensure a higher pressure of refrigerant vapor in the condenser, so that the refrigerant vapor radiates heat and condenses into liquid in the condenser; Ensure that the refrigerant liquid has a lower pressure in the evaporator, so that the refrigerant liquid absorbs heat and evaporates into gas in the evaporator. (2) control refrigerant flow. If the Capillary resistance is large, the refrigerant flow rate is small, the refrigerating capacity is small, and the evaporation temperature is low; If the Capillary resistance is small, the refrigerant flow is large, the refrigerating capacity is large, and the evaporation temperature is high. Four, evaporator, evaporator is the cold-producing part of commercial freezer refrigeration system, commonly known as cold source. The function of evaporator: the refrigerant gas-liquid mixture after reducing pressure from the capillary enters the evaporator, evaporates from liquid to gas at low pressure, and absorbs the heat in the cabinet through the evaporator to achieve the purpose of refrigeration. The lower the evaporation temperature of the refrigerant in the evaporator, the greater the ability to cool the surrounding objects, and its evaporation area is determined by the cooling capacity of the compressor. Five, freezer drying filter, drying filter is installed between the condenser and capillary tube, used to adsorb moisture in the refrigeration system to prevent ice blockage, and also plays a filtering role, prevent impurities, fragments, etc. from entering the capillary to cause dirty blockage. Six, refrigerant, refrigerant refers to the working medium to realize refrigeration cycle in refrigeration system. Types and characteristics of refrigerants: There are mainly four types of refrigerants used in freezers: R12, mixed working medium (R152a/R22), R134a, R600a.

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