The function and description of each component of the cold storage system Jun 08, 2022

1. Compressor: It plays the role of compressing and driving the refrigerant in the refrigerant circuit, and is the power of the refrigeration system.


2. Condenser: It is one of the main heat exchange equipment in the refrigeration system of cold storage. Its function is to cool and condense the superheated vapor of the high-temperature refrigerant discharged from the compressor of the assembled cold storage into high-pressure liquid.


3. Evaporator: The liquid refrigerant evaporates at low pressure and low temperature, absorbs the heat from the freezer and evaporates, and turns into a gaseous refrigerant. The gaseous refrigerant is sucked into the compressor and compressed, and then discharged into the condenser to discharge heat. Basically, the principle of the evaporator and the condenser is the same, the difference is that the former absorbs heat into the storehouse, and the latter exhausts heat to the outside.


4. Liquid storage tank: store Freon storage tank to ensure that the refrigerant is always in a saturated state.

 Liquid storage tank

5. Solenoid valve: one is to prevent the high-pressure part of the refrigerant liquid from entering the evaporator when the compressor is stopped, to prevent the low-pressure from being too high when the compressor is started next time, and to prevent the compressor from liquid shock. Second, when the temperature of the cold storage reaches the set value, the thermostat will act, the solenoid valve will lose power, and the compressor will stop when the low pressure pressure reaches the set value. When the electricity is turned on, the compressor starts when the low pressure pressure rises to the compressor start setting value.
6. High and low pressure protector: to prevent high pressure and low pressure from being too low to protect the compressor.
7. Thermostat: It is equivalent to the brain of the cold storage that controls the opening and stopping of refrigeration, defrosting, and the opening and stopping of fans.
8. Dry filter: filter impurities and moisture in the system.
9. Oil pressure protector: ensure that the compressor has enough lubricating oil.
10. Expansion valve: The high-pressure refrigeration liquid at the outlet of the expansion valve is rapidly expanded and evaporated, and the heat in the air is absorbed through the tube wall for cold and heat exchange.

11. Oil separator: its function is to separate the lubricating oil in the high-pressure steam discharged from the refrigeration compressor to ensure the safe and efficient operation of the device. According to the principle of oil separation by reducing the airflow speed and changing the airflow direction, the oil particles in the high-pressure steam are separated under the action of gravity. Generally, when the airflow velocity is below 1m/s, the oil particles with a diameter of more than 0.2mm contained in the steam can be separated. There are four types of oil separators commonly used: washing type, centrifugal type, packing type and filter type.

Oil separator

12. Evaporator pressure regulating valve: It is to prevent the evaporator pressure (and evaporation temperature) from falling below the specified value. It is also sometimes used to adjust evaporator pressure to suit changes in load.
13. Fan governor: This series of fan governors are mainly used for the speed regulation of the fan motor of the outdoor air-cooled condenser of the refrigeration equipment, or the speed regulation of the cooling fan of the cold storage.

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