Do you know all these common failures of refrigeration maintenance?

1. Exhaust temperature of refrigerant.com/hfc-refrigerant' target='_blank'>refrigeration system is too low: Exhaust pressure is too low, mainly caused by the low refrigerant flow of refrigeration system pipeline or even stop. Exhaust pressure is too low, although its phenomenon is manifested in the high-pressure side, but the reason is mostly at the low-pressure side. Reasons for low exhaust pressure: 1. The expansion valve hole is blocked, and the liquid supply is reduced or even stopped. At this time, the suction and exhaust pressures are reduced. 2. The expansion valve is blocked by ice or dirty and the filter is blocked, which will inevitably reduce the suction and discharge pressures;

2. Liquid return in the refrigeration system 1. For the use of capillary tubes Small refrigeration system: excessive liquid filling will cause liquid back. When the evaporator is severely frosted or the fan fails, the heat transfer becomes poor, and the unevaporated liquid will cause liquid back. Frequent temperature fluctuations can also cause the expansion valve to fail to respond and cause liquid flood back. 2. For refrigeration systems using expansion valves: Liquid return is closely related to the improper use and selection of expansion valves. Excessive selection of the expansion valve, too small superheat setting, incorrect installation of the temperature sensing bulb, damaged adiabatic dressing, and failure of the expansion valve may cause liquid backflow. For refrigeration systems where liquid return is difficult to avoid, installing a gas-liquid separator control can effectively prevent or reduce the harm of liquid return.

The suction temperature of the refrigeration system is high: 1. The suction temperature is too high due to other reasons. If the return air pipe is not well insulated or the pipe is too long, it can cause the suction temperature to be too high. Under normal circumstances, the compressor cylinder head should be half cold and half hot. 2. The refrigerant charge in the system is insufficient. Or the opening of the expansion valve is too small, resulting in insufficient refrigerant circulation in the system, the amount of refrigerant entering the evaporator is small, the degree of superheat is large, and the suction temperature is high. 3. The filter screen of the expansion valve port is blocked. The liquid supply in the evaporator is insufficient, the amount of refrigerant liquid is reduced, and a part of the evaporator is occupied by superheated steam, so the suction temperature increases.

Third, liquid hammer 1. Avoid excessively high or low temperature inhalation. If the suction temperature is too low, it indicates that the refrigerant is not completely evaporated in the evaporator, which not only reduces the heat exchange efficiency of the evaporator, but the suction of wet steam will also cause compressor liquid hammer. The suction temperature should be 5～10℃ higher than the evaporation temperature under normal circumstances. 2. In order to ensure the safe operation of the compressor and prevent the occurrence of liquid hammer, the suction temperature is required to be higher than the evaporation temperature, that is, it should have a certain degree of superheat.

Fourth, the refrigeration system starts with liquid 1. The foaming phenomenon when starting with liquid can be clearly observed on the oil sight glass. The root cause is that a large amount of refrigerant dissolved in the lubricating oil and sinking under the lubricating oil suddenly boils when the pressure drops suddenly and causes the lubricating oil to bubble, which is easy to cause liquid hammer. 2. The compressor is equipped with a crankcase heater (electric heater) to effectively prevent the migration of refrigerant. Shut down for a short time to maintain the crankcase heater energized. After a long period of shutdown, heat the lubricating oil for several or ten hours before starting. Installing a gas-liquid separator on the return gas pipeline can increase the resistance of refrigerant migration and reduce the amount of migration.

V. Oil return in the refrigeration system 1. Lack of oil will cause serious lack of lubrication. The root cause of the lack of oil is not the amount and speed of the compressor running oil, but the poor oil return of the system. The installation of an oil separator can quickly return oil and extend the compressor running time without oil return. 2. When the compressor is higher than the evaporator, there is no oil return bend on the vertical return pipe. The return bend should be as compact as possible to reduce oil storage. The spacing between the oil return bends should be appropriate. When the number of oil return bends is large, some lubricant should be added. 3. The compressor starts frequently. Frequent starting of the compressor is not conducive to oil return. Because the continuous operation time is very short, the compressor stops, and there is no time to form a stable high-speed airflow in the return pipe, so the lubricating oil can only stay in the pipeline. If the oil return is less than Ben oil, the compressor will be short of oil. The shorter the operating time, the longer the pipeline and the more complex the system, the more prominent the oil return problem.

Sixth, the refrigeration system evaporating temperature is low The evaporating temperature has a great influence on the refrigeration efficiency, every time it decreases by 1 degree, the same cooling capacity requires an increase of 4%. Therefore, when conditions permit, appropriately increasing the evaporation temperature is beneficial to improving the refrigeration efficiency. The evaporation temperature is generally 5-10 degrees lower than the air outlet temperature. Blindly lowering the evaporation temperature can cool the temperature difference, but the cooling capacity of the compressor is reduced, so the cooling speed is not necessarily fast. Moreover, the lower the evaporating temperature, the lower the refrigeration coefficient, but the load increases, the operating time is extended, and the power consumption will increase.

Seven. The main reasons for the exhaust gas overheating of the refrigeration system are the following: high return air temperature, motor heating, high compression ratio, anti-expansion and gas mixing, Compression temperature rise, refrigerant type, and condensing pressure are high. Regarding the specific reasons and analysis of the exhaust gas overheating of the refrigeration system, Refrigeration Encyclopedia has previously published an article specifically to elaborate on it. If you are interested, please click on the previously published article, and I will not repeat it here.

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