The screw freezer is fin type, adopts double oil corrugated hydrophilic aluminum platinum, and is manufactured by professional heat exchanger processing equipment. It has the advantages of compact structure, small volume, light weight and high heat exchange efficiency, and is equipped with a large rotating speed. The leaf axial flow fan can effectively reduce the running noise and reduce the impact on the surrounding environment.
The unit control system of the screw freezer adopts the imported PLC program controller, and the human-machine interface is equipped with a large screen touch screen. The interface is simple and generous, and the operation is intuitive and simple. The unit has reliable safety protection devices, including: high and low voltage protector, exhaust superheat protector, compressor motor overheat protector, overload current protector, antifreeze temperature protector, water flow protector, emergency stop switch, temperature sensitive Fused plugs, safety valves, etc.
The two-stage refrigeration cycle of the screw freezer is developed on the basis of a single-stage refrigeration cycle. The compression process is carried out in two stages. The low-pressure stage cylinder of refrigerant vapor from the evaporator is compressed to the intermediate pressure, and then enters through intermediate cooling. The high pressure stage cylinder is compressed to the condensing pressure into the condenser.
Generally, when the evaporation temperature is between -25 ° C and -50 ° C, a two-stage compressor should be used for cooling. The refrigeration system consists of an evaporator, a two-stage compressor, an oil separator, a condenser, an intercooler, an ammonia storage device, an ammonia separator, a throttle valve, and other ancillary equipment, and is connected to each other through a pipe to form a closed system. . Among them, the intercooler uses a small amount of liquid refrigerant to vaporize and absorb heat at an intermediate pressure, so that the superheated steam discharged from the low-pressure stage is cooled, the suction temperature of the high-pressure stage is lowered, and the high-pressure liquid refrigerant is cooled.
