Why does the direct cooling block ice machine slow down?

by:CBFI     2021-08-20
Some friends report that the freezing speed of the ice cube maker is very slow. So, what is the reason for the slow freezing speed of the direct cooling ice cube machine? Let's take a look together. 1. The surface of the evaporator becomes dirty, greasy or dusty, and the heat transfer effect is reduced. This situation is mainly caused by the long idle time of the equipment, unqualified water quality, and harsh equipment use environment. In addition to the poor heat transfer effect of the evaporator, the surface of the evaporator becomes too thick due to long-term uncleaned dust, and the heat transfer efficiency is also significantly reduced. 2. Due to the poor heat preservation effect or sealing performance of the direct cooling block ice maker, the cold loss is large. The poor thermal insulation performance is due to the insufficient thickness of the pipeline thermal insulation layer, uneven thickness of the evaporator plate, and poor thermal insulation effect, mainly due to the manufacturer's improper selection of the thermal insulation layer thickness or production process. In addition, when the device is used, the thermal insulation and moisture resistance of the thermal insulation material may be damaged, which may cause moisture exposure, deformation, and even corrosion of the thermal insulation layer. The thermal insulation performance of the thermal insulation material is reduced, and the direct cooling effect of the cbfi ice machine is poor. Another important reason is the poor heat insulation and sealing performance of the equipment. Condensation usually occurs around the insulation of the equipment, which indicates that the seal is not tight. 3. There is more air or refrigerated oil in the evaporator of the direct cooling block cbfi ice machine, which reduces the heat transfer effect. Once the refrigerating oil adheres to the inner surface of the heat exchange tube of the evaporator, its heat transfer coefficient will decrease. Similarly, if there is more air in the heat exchange tube, the heat transfer area of u200bu200bthe evaporator will be reduced, its heat transfer efficiency will be significantly reduced, and the freezing effect will be slowed down accordingly. Therefore, in daily operation and maintenance, care should be taken to eliminate the oil on the inner surface of the evaporator heat pipe in time to improve the heat transfer efficiency of the evaporator. 4. The throttle valve of the ice block is improperly adjusted or blocked, and the refrigerant flow is too large or too small. The blockage of the regulating valve or throttle valve will directly affect the flow of refrigerant into the evaporator. When the throttle valve is opened too much, the refrigerant flow rate is relatively large, and the evaporation pressure and the evaporation temperature also increase. The freezing speed of the direct cooling cbfi ice machine will slow down. At the same time, when the throttle valve is opened too small or blocked, the flow rate of the refrigerant decreases, the refrigerant volume of the system also decreases, and the freezing speed also slows down. 5. The compressor has low efficiency and the cooling capacity cannot meet the ice making load. The compressor runs for a long time and is severely worn, the compressor clearance increases, the sealing performance is correspondingly reduced, the gas transmission coefficient of the compressor is also reduced, and the cooling capacity is reduced. When the ice making volume is less than the ice making load, the ice making efficiency is reduced. The cooling capacity of the compressor can be roughly determined by observing the suction and discharge pressure of the compressor. If the refrigeration capacity of the compressor is reduced, the usual method is to replace the cylinder liner and piston ring of the compressor. If the replacement is invalid, other factors should be considered, and even the machine should be removed for maintenance and troubleshooting. 6. The refrigeration capacity of the ice cube machine system is insufficient, and the refrigeration capacity is insufficient. There are two main reasons for insufficient refrigerant circulation. First, the refrigerant charge is insufficient. Another reason is that more refrigerant leaks in the system. In this case, you should find the leaks first, and focus on checking each leak.
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