Single-stage vapor compression refrigeration system is composed of refrigeration compressor, condenser, throttle and evaporator four basic components. They are connected by pipes in sequence to form a closed system, the refrigerant circulating in the system constantly, the state changes occur, with the outside world for heat exchange.
After the liquid refrigerant absorbs the heat of the cooled object in the evaporator, the liquid refrigerant is vaporized into low-temperature and low-pressure steam, which is sucked into the compressor and compressed into high-pressure and high-temperature steam and then discharged into a condenser. The liquid refrigerant is cooled to a cooling medium ) Exothermic, condensation of high-pressure liquid, throttling valve for the low-pressure low-temperature refrigerant, re-enter the evaporator endothermic vaporization, to achieve the purpose of circulating cooling. In this way, the refrigerant in the system after compression, condensation, throttling, evaporation of four basic processes to complete a refrigeration cycle.
In refrigeration systems, evaporators, condensers, compressors and throttles are the four essential components of a refrigeration system, of which the evaporator is the device that delivers the cold. The refrigerant absorbs heat from the cooled object to cool it. Compressor is the heart, plays a suction, compression, the role of refrigerant vapor transmission, it inhales low temperature and low pressure refrigerant gas from the suction tube, driven by the motor to run the piston to its compression, the exhaust pipe to discharge high temperature and pressure The refrigerant gas, which powers the refrigeration cycle, achieves a refrigeration cycle of compression → condensation → expansion → evaporation (endothermic). . Condenser is a device that emits heat and conveys the heat absorbed by the evaporator together with the heat converted by the compressor to the cooling medium. The throttle plays a role of reducing the pressure of the refrigerant, and at the same time, controlling and regulating the quantity of the refrigerant liquid flowing into the evaporator, and dividing the system into two parts of a high pressure side and a low pressure side. The actual refrigeration system, in addition to the above four pieces, there are often some auxiliary equipment, such as solenoid valves, distributors, dryers, collectors, fusible plugs, pressure controllers and other components, which is to improve the operation Economy, reliability and safety.