supermarket refrigerated showcase » article > commercial refrigeration > The structure and working principle of dual-temperature dual-control walk-in cooler
The structure and working principle of dual-temperature dual-control walk-in cooler
author: supermarket refrigerated showcase category: commercial refrigeration Views: 554Time: 2016-08-22
dual-temperature dual-control walk-in cooler The electromagnetic reversing valve forms a double refrigeration circuit, which solves the problem of using small compressors to drive large capacity and large freezer compartments (more than 30% of the total capacity) of cold distribution. Compared with the ordinary walk-in cooler, the refrigeration system adds a capillary tube and a two-way solenoid valve, and the electrical system adds a refrigeration thermostat. The working principle of
dual-temperature dual-control cold system: dual-temperature dual-control walk-in cooler is a typical refrigeration system. The refrigeration system consists of a compressor, a filter, a condenser, a solenoid valve, a cold room capillary tube and a freezer capillary tube, and the cold room evaporation It is composed of a cooler and a freezer evaporator. Compared with the general two-door direct cooling walk-in cooler refrigeration system, it adds a capillary tube and a solenoid valve responsible for cold distribution.
When the solenoid valve is de-energized, the solenoid valve does not operate and the refrigerating capillary tube is connected, so that the high-pressure liquid refrigerant from the condenser enters the capillary tube throttling of the refrigerating chamber through the filter and the solenoid valve, and the high-pressure liquid refrigerant is ejected from the capillary nozzle At the moment when the refrigerating evaporator becomes low pressure, the low pressure liquid first enters the refrigerating compartment evaporator to absorb heat from the surrounding space, and then enters the freezer compartment evaporator to absorb the heat of the freezer compartment. After the low pressure liquid is fully evaporated and vaporized, it is completely converted into low pressure gas. After being compressed into high-pressure, high-temperature gas by the suction compressor, it is discharged to the condenser. This refrigeration process is the same as the circulation path of the ordinary double-door direct cooling walk-in cooler refrigerant, that is, the refrigeration and freezer compartments are cooled at the same time. When the solenoid valve is energized, the solenoid valve acts to cut off the capillary of the refrigerating chamber and connect the capillary of the freezer. The walk-in cooler refrigerant flows through the capillary of the freezer to decompress and throttle after being condensed, and then directly enters the freezer to evaporate. , The temperature inside the freezing chamber is lowered, and the vaporized refrigerant gas is sucked into the compressor and compressed. In this cooling process, only the freezer compartment is cooled, and the refrigerating compartment is not.
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