The Direct Cooling Block Ice Machine Freezes For A Long Time, How To Solve The Problem Of Slow Freezing, There Are Six Reasons

The direct cooling block ice machine freezes for a long time, how to solve the problem of slow freezing, there are six reasons

Six reasons why the freezing speed of the direct cooling block ice machine slows down
1. The surface of the evaporator is scaled, oily or dusty, and the heat transfer effect is reduced.
This situation is mainly caused by the equipment not being used for a long time, the water quality not containing, and the environment in which the equipment is used is poor.
In addition to the poor heat transfer effect of the evaporator, the surface of the evaporator is too thick due to long-term cleaning, and its heat transfer efficiency will also decrease significantly.
2. Due to the poor insulation effect or sealing performance of the direct cooling block ice machine, the loss of cooling capacity is large
The poor heat insulation performance is due to the insufficient thickness of the insulation layer of the pipe and evaporator plate, and the poor heat insulation and heat preservation effect. It is mainly caused by the improper selection of the thickness of the insulation layer during the design of the manufacturer or the 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 thermal insulation layer to be damp, deformed, or even eroded, and its thermal insulation capacity is reduced. Another important reason for the poor freezing effect of direct cooling block ice machines is the The thermal insulation and sealing performance is poor, and more hot air invades the equipment from the leak. Generally, condensation will appear around the insulation of the equipment, which means 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 more refrigerant oil is attached to the inner surface of the heat transfer tube of the evaporator, its heat transfer coefficient will decrease. Similarly, if there is more air in the heat transfer tube, the heat transfer area of the evaporator will decrease, and its heat transfer coefficient The efficiency will also drop significantly, and the freezing effect will slow down accordingly. Therefore, in daily operation and maintenance, care should be taken to remove the oil on the inner surface of the evaporator heat transfer tube in time to improve the heat transfer efficiency of the evaporator.
4. The throttle valve is improperly adjusted or blocked, and the refrigerant flow rate is too large or too small
Improper adjustment or blockage of the throttle valve will directly affect the refrigerant flow into the evaporator. When the throttle valve is opened too large, the refrigerant flow rate is too large, and the evaporation pressure and 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 When it is blocked, the refrigerant flow rate will also decrease, the cooling capacity of the system will also decrease, and the freezing speed will also slow down. Generally, it can be judged whether the refrigerant flow rate of the throttle valve is appropriate by observing the evaporation pressure, evaporation temperature and frosting of the suction pipe. The blockage of the throttle valve is an important factor affecting the flow of refrigerant. The main reasons for the blockage of the throttle valve are five. Ice blockage and dirty blockage. Ice blockage is due to the poor drying effect of the dryer. The refrigerant contains moisture. When it flows through the throttle valve, the temperature drops below 0°C, and the moisture in the refrigerant freezes and blocks the throttle valve hole; dirty blockage is Due to the accumulation of more dirt on the inlet filter of the throttle valve, the circulation of the refrigerant is not smooth, forming a blockage.
6. The efficiency of the compressor is low, and the cooling capacity cannot meet the ice making load
Due to the long-term operation of the compressor, the wear and tear is serious, the gap between the compression equipment increases, the sealing performance will decrease accordingly, the air transmission coefficient of the compressor 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 drop. 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, or even the machine should be disassembled for maintenance to eliminate the fault factors.
7. The amount of refrigerant in the system is insufficient, and the cooling capacity is insufficient
There are two main reasons for insufficient refrigerant circulation. One is insufficient refrigerant charge. At this time, it is only necessary to add a sufficient amount of refrigerant. Another reason is that there are many refrigerant leaks in the system. In this case, you should first find the leak point, focus on checking the connections of the pipes and valves, and fill in a sufficient amount of refrigerant after the leak is found and repaired.