Refrigerant affects cold storage temperature common problem analysis_maintenance

News: Generally, you can judge whether the throttle valve refrigerant flow is appropriate by observing the evaporating pressure, evaporating temperature, and frosting of the suction pipe. Throttle valve blockage is an important factor affecting refrigerant flow. The main cause of throttle valve blockage is ice blockage and dirty blockage. The technical staff believes that the ice blockage is due to the poor drying effect of the dryer. The refrigerant contains moisture. When it flows through the throttle valve, the temperature drops below 0°C. The moisture in the refrigerant freezes and blocks the throttle valve hole; Dirty blockage is caused by the accumulation of more dirt on the inlet filter of the throttle valve, and the flow of refrigerant is not smooth, resulting in blockage.　　　　The amount of refrigerant in the system is insufficient, and the refrigeration capacity is insufficient. There are two main reasons for the insufficient refrigerant circulation. One is the insufficient refrigerant charge. At this time, only a sufficient amount of cold storage refrigerant is needed. Another reason is that there are many refrigerant leaks in the system. In this case, you should first find the leaks, and focus on checking the connections of the pipes and valves. After the leaks are repaired, they can be filled with sufficient refrigerant. The cold storage compressor has low efficiency and the cooling capacity cannot meet the load requirements of the cold storage warehouse. Due to the long-term operation of the compressor, the cylinder liner, piston ring and other components will be severely worn and the matching clearance will increase. The sealing performance will be correspondingly reduced. If it is reduced, the cooling capacity will be reduced. When the cooling capacity is less than the thermal load of the warehouse, the temperature of the warehouse will decrease slowly. The refrigeration capacity of the compressor can be roughly judged by observing the suction and discharge pressure of the compressor. If the refrigeration capacity of the compressor decreases, the common method is to replace the cylinder liner and piston ring of the compressor. If the replacement still does not work, other factors should be considered, and even the machine should be disassembled for maintenance and troubleshooting.

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