The high and low temperature test chamber is a place where maintenance problems are gathered, from compressors to control systems to heating systems, to switches and solenoid valves, and no maintenance is required. Today, I would like to share with you first how the high and low temperature test chambers solve the problem of too much frozen oil in the evaporator. Too much refrigeration oil in the evaporator can also cause insufficient cooling and slow cooling. The oil stored in the ammonia vertical evaporator can be judged directly through the hot and cold boundary of the oil surface. If the oil level is too high, it should be released in time. Some Freon and refrigerating machine oil dissolve each other. Therefore, when the refrigerant in the high and low temperature test chamber refrigeration system is circulating, it is inevitable that the refrigerator oil will remain in each component. Residual refrigerant oil in the heat exchanger will affect the heat transfer coefficient. Especially when the refrigerating machine oil enters the evaporator, if the structural design or installation is unreasonable, the refrigerating machine oil will only be inaccessible or more in and out, so that more and more refrigerating machine oil remains in the evaporator, which seriously affects its suction. The heat effect occurs when there is insufficient cooling capacity. If the temperature is not treated at this point, the temperature will not drop. Therefore, the oil draining work must be carried out. How to judge that there is more refrigeration oil in the evaporation tube of the high and low temperature test chamber and affect the refrigeration is a difficult thing. If this happens, there will be an obvious anomaly, that is, the hoarfrost on the evaporation tube is sparsely pulled, incompletely formed, and is frosted. If there is no other failure, it is likely to be residual in the evaporation tube. There are too many refrigeration oils. To remove the freezer oil from the evaporator, it must be removed, purged and dried. For the tube type evaporator, it is inconvenient to disassemble, the inlet of the evaporator can be blown with compressed air, and then the tube is baked with a blowtorch.
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