Tell Me Why The Freezing Speed Of The Block Ice Machine Slows Down?

Some friends reported that the freezing speed of the block ice machine slowed down. So, what are the reasons for the slow freezing speed of the direct cooling block ice machine? Let's take a look together!

1. The surface of the evaporator becomes dirty, greasy or dusty, and the heat transfer effect decreases. This situation is mainly due to the long idle time of the equipment, unqualified water quality, poor equipment use environment and other reasons. In addition to the poor heat transfer effect of the evaporator, due to long-term uncleaned dust, the surface of the evaporator becomes too thick, and the heat transfer efficiency is also significantly reduced.

2. Due to the poor insulation effect or poor sealing performance of the direct cooling block ice machine, the cold loss is large. Poor thermal insulation performance is due to insufficient thickness of pipe insulation layer, uneven thickness of evaporator plate, poor thermal insulation effect, mainly due to improper selection of insulation layer thickness or production process by the manufacturer. signature. In addition, when using the device, the thermal insulation and moisture-proof properties of the insulation material may be damaged, which may lead to moisture exposure, deformation and even erosion of the insulation layer. The thermal insulation performance of the insulation material is reduced, and the effect of directly cooling the ice machine is poor. Another important reason is 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 ice machine, and the heat transfer effect is reduced. Once the refrigerated oil is attached 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 the 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 block ice machine is improperly adjusted or blocked, and the refrigerant flow rate 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 large, the refrigerant flow rate is relatively large, and the evaporation pressure and evaporation temperature also increase. The freezing speed of the direct cooling ice cube ice machine will be slowed down. At the same time, when the throttle valve is opened too small or blocked, the flow of refrigerant will decrease, the volume of refrigerant in the system will also decrease, and the freezing speed will also slow down.

5. The efficiency of the compressor is low, and the cooling capacity cannot meet the ice making load. The compressor runs for a long time, the wear is serious, the compressor gap increases, the sealing performance decreases accordingly, the gas transmission coefficient of the compressor also decreases, and the cooling capacity decreases. When the ice production volume is less than the ice production load, the ice production efficiency decreases. The cooling capacity of the compressor can be roughly determined by observing the suction and discharge pressure of the compressor. If the cooling 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 not effective, other factors should be considered, and even the machine should be removed for maintenance and troubleshooting.

6. The cooling capacity of the block ice machine system is insufficient, and the cooling capacity is insufficient. There are two main reasons for insufficient refrigerant circulation. One is insufficient refrigerant filling. Another reason is that there are many refrigerant leaks in the system. In this case, you should first find out the leak point and focus on checking each