● evaporator: in general, the high-temperature library selection of fans for the evaporator, which is characterized by fast cooling speed, but easy to cause moisture loss of cold storage products; low-temperature cold storage selection of seamless steel tube produced by the evaporator tube-based, which is characterized by a good effect of thermostat and can be stored in the cold at the right time.
● condenser: condenser air cooling, water cooling and air and water combination of cooling methods. Air cooling is limited to applications in small cold storage equipment, and 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. The evaporator inlet pressure is felt under the diaphragm of internally balanced expansion valves; while the evaporator outlet pressure is felt under the diaphragm of externally balanced expansion valves.
● Liquid Storage Tank: Store Freon to ensure that the refrigerant is always in a saturated state.
● Solenoid valve: to prevent the compressor from shutting down when the high pressure part of the refrigerant liquid into the evaporator, to avoid the next start of the compressor 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: to prevent high pressure is too high and low pressure is too low to protect the compressor.
● thermostat: equivalent to the cold storage brain control of the cold storage refrigeration on and off and frost, fan open and quite.
● Filter drier: filter 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 used oil separator has four kinds of washing type, centrifugal type, packing type and filtration type.
●Evaporator pressure adjustment valve: It is to prevent the evaporator pressure (as well as the evaporating temperature) from decreasing below the specified value. Some times it is also used to adjust the evaporator pressure to force to adapt to the change of load.