Generally, small cold storage selection of hermetic compressor. Medium-sized cold storage generally use semi-hermetic compressor. Large cold storage selection of semi-hermetic compressor or screw compressor. In the selection, can also consider the use of ammonia refrigeration compressor, because the ammonia refrigeration compressor power, and can be a multi-purpose, but the installation and management is more cumbersome.
Evaporator: in general, the high-temperature library selection of fans for the evaporator, which is characterized by rapid cooling speed, but easy to cause moisture loss of cold storage products; in the low-temperature cold storage selection of seamless steel tube produced by the evaporator tube is mainly characterized by the effect of thermostat is good, and can be stored in the cold at the right time.
Condenser: the condenser has air cooling, water cooling and air and water combination of cooling methods. Air cooling is limited to applications in small cold storage equipment, water-cooled condensers can be used in all forms of refrigeration systems.
Thermal Expansion Valves: Thermal expansion valves are divided into internally balanced expansion valves and externally balanced expansion valves, where the evaporator inlet pressure is felt below the diaphragm of the internally balanced expansion valve; and the evaporator outlet pressure is felt below the diaphragm of the externally balanced expansion valve.
Liquid storage tank: store Freon to ensure that the refrigerant is always in a saturated state.
Solenoid valve: to prevent the compressor shutdown high-pressure part of the refrigerant liquid into the evaporator, to avoid the compressor next time the start of the low-pressure is too high, to prevent the compressor liquid shock. In addition, the cold storage temperature reaches the set value when the thermostat action, the solenoid valve is de-energized, the low pressure reaches the shutdown set value when the compressor stops, when the temperature in the cold storage back to the set value, the thermostat action, the solenoid valve is energized, the low pressure rises to the compressor start-up set value when the compressor starts.
High and low pressure protector: prevent high pressure too high and low pressure too low to protect the compressor.
Thermostat: it is equivalent to the brain of the cold storage to control the cold storage refrigeration on and off and defrost, fan on and quite.
Filter drier: filtering impurities and water in the system.
Oil pressure protector: to ensure that the compressor has enough lubricating oil.
Oil separator: its role is to separate the lubricating oil in the high-pressure vapor discharged from the refrigeration compressor to ensure the safe and efficient operation of the device. According to reduce air velocity and change the direction of airflow oil separation principle, so that the oil particles in the high-pressure steam can be separated under the action of gravity. Generally, if the airflow speed is below 1m/s, oil particles with a diameter of 0.2mm or more contained in the steam can be separated. Usually use the oil separator has washing type, centrifugal type, packing type and filter type four.
Evaporator pressure adjustment valve: is to prevent the evaporator pressure (as well as evaporation temperature) reduced to below the specified value. Some time also use it to adjust the evaporator pressure to force to adapt to the load change.
Other refrigeration system accessories: door locks, hinges, handles, air curtains and so on.