We all know that the refrigeration system is a general term for the equipment and pipelines that refrigerant flows through, including compressors, condensers, throttling devices, evaporators, pipelines and ancillary equipment, which is the main component system of air conditioning equipment, cooling and refrigeration equipment. The blockage failure of refrigeration system has various forms such as ice blockage, dirty blockage and oil blockage.

Among them, the occurrence of ice blockage fault is mainly due to the excessive water in the refrigeration system, with the continuous circulation of refrigerant, the water in the refrigeration system gradually concentrated at the expansion valve outlet, because the expansion valve outlet temperature is the lowest, the water formed ice and gradually increased, to a certain extent, the expansion valve will be completely blocked, the refrigerant can not be recycled, the system is no longer cooling.

The formation of the dirty blockage fault is caused by excessive impurities in the refrigeration system. When these impurities and powder flow through the filter dryer, most of them are removed by the filter dryer. If there are more impurities in the system, the filter dryer will gradually be blocked. Because the filter itself has limited capacity to filter dirt and impurities, it will be blocked due to the continuous accumulation of impurities.

In addition, there is oil blocking fault, the main reason for the refrigeration system to produce oil blocking is that the system does not consider the flow rate of the system at low load when the system is designed, resulting in insufficient oil return, and the excess chilled oil is charged at this time. When the load rises again, the excess chilled oil is discharged into the condenser with the compressor exhaust, and then into the filter dryer with the refrigerant. Because the viscosity of the oil is large, it is blocked by the desiccant in the filter, and when the oil is too much, it forms a blockage at the inlet of the filter, so that the refrigerant can not be normally circulated and can not be refrigerated.

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