The reason why the freezing speed of the direct cooling block ice machine slows down

by:CBFI     2021-08-04
1. Due to poor heat preservation effect or sealing performance, the direct cooling block Tube Ice Machine causes a large loss of cooling capacity. The poor heat insulation performance is due to the insufficient thickness of the insulation layer of the pipes and evaporator plates, and the heat insulation and heat preservation effect is poor. It is mainly designed by the manufacturer It is caused by improper selection of insulation layer thickness or production process. In addition, during the use of the equipment, the thermal insulation and moisture-proof performance of the thermal insulation material may be damaged, causing the insulation layer to be damp, deformed, or even eroded, and its thermal insulation ability is reduced. The direct cooling block ice machine has a poor freezing effect. Another important reason is the equipment insulation. The sealing performance is poor, and more hot air enters the equipment from the leak. Generally, condensation occurs around the equipment insulation, which indicates that the seal is not tight. 2. 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 sufficient 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. 3. The surface of the evaporator is scaled, oily or dusty, and the heat transfer effect is reduced. This situation is mainly because the equipment is not used for a long time, the water quality is not included, and the poor use environment of the equipment causes poor heat transfer of the evaporator. If the surface has not been cleaned for a long time and the dust is too thick, its heat transfer efficiency will also be significantly reduced. 4. Compressor efficiency is low, and cooling capacity cannot meet the ice making load. Compressors are severely worn due to long-term operation, and the gap between the compression equipment increases, and the sealing performance will correspondingly decrease. The compressor's air delivery coefficient will also decrease, and the cooling capacity will decrease. . When the cooling capacity is less than the ice-making heat load, the ice-making efficiency will decrease. 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. 5. Improper adjustment or blockage of the throttle valve, excessive refrigerant flow or improper adjustment or blockage of the small throttle valve, will directly affect the refrigerant flow into the evaporator. When the throttle valve is opened too large, the refrigerant flow is too large, the evaporation pressure and the evaporation temperature will also increase, and the freezing speed of the direct cooling block ice machine will slow down; at the same time, when the throttle valve is opened too small or blocked At this time, the refrigerant flow rate is also reduced, the cooling capacity of the system is also reduced, the freezing speed will also slow down. 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. 6. Ice blockage and dirty blockage The ice blockage is due to the poor drying effect of the dryer, and the refrigerant contains moisture. When it flows through the throttle valve, the temperature drops below 0℃, and the moisture in the refrigerant freezes and blocks the section. Flow valve hole; Dirty blockage is caused by the accumulation of more dirt on the filter screen of the throttle valve inlet, and the flow of refrigerant is not smooth, resulting in blockage. 7. There is more air or refrigerant oil in the evaporator of the direct cooling block ice machine, and the heat transfer effect is reduced. Once more refrigerant oil is attached to the inner surface of the heat transfer tube of the evaporator, the heat transfer coefficient will decrease. Similarly, If there is more air in the heat transfer tube, the heat transfer area of u200bu200bthe evaporator will be reduced, and its heat transfer efficiency will also be significantly reduced, and the freezing effect will be slowed down. Therefore, in daily operation and maintenance, attention should be paid to timely removing the oil on the inner surface of the evaporator heat transfer tube to improve the heat transfer efficiency of the evaporator.
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