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Refrigerant is an important factor affecting the cold storage temperature. Improper adjustment or blocking of the throttle valve will directly affect the flow of refrigerant into the evaporator. When the opening of the cold storage valve is too large, the refrigerant flow is too high, the evaporation pressure and the evaporation temperature will also increase, the warehouse temperature drop rate will slow down; at the same time, when the throttle opening is too small or blocked, cooling The flow rate of the agent is also reduced, the cooling capacity of the system is also reduced, and the temperature drop of the warehouse is also slowed down.
Generally, it can be judged whether the throttle valve refrigerant flow is appropriate by observing the evaporation pressure, the evaporation temperature and the frosting condition of the suction pipe. Throttle plugging is an important factor affecting the flow of refrigerant. The main causes of blockage of the throttle valve are ice blocking and dirty plugging. Relevant experts stated that the ice blocking is due to the poor drying effect of the drier. The refrigerant contains moisture. When flowing through the throttling valve, the temperature drops below 0°C. The moisture in the refrigerant freezes and the throttle hole is blocked. Dirty plugging is caused by the accumulation of more dirt on the inlet filter screen of the throttle valve, and the circulation of the refrigerant is not smooth, resulting in blockage.
The lack of refrigerant circulation mainly has two reasons. First, the refrigerant charge is insufficient. In this case, only enough cold storage refrigerant can be added. Another reason is that there is a large amount of refrigerant leakage in the system. In this case, leakage points should be searched first, and the pipelines and valve connections should be inspected. After the leaks are repaired, a sufficient amount of refrigerant can be filled.
Due to long-term operation of the compressor, cylinder sleeves, piston rings and other components are severely worn and the clearance increases. As a result, the sealing performance will be reduced accordingly, and the compressor's gas delivery coefficient will also be reduced, and the cooling capacity will be reduced. When the cooling capacity is less than the heat load of the warehouse, the temperature of the warehouse will decrease slowly. By observing the suction and discharge pressure of the compressor, the cooling capacity of the compressor can be roughly judged. If the refrigeration capacity of the compressor is reduced, the commonly used method is to replace the cylinder liner and piston ring of the compressor. If the cylinder sleeve and piston ring of the compressor cannot be worked out after replacement, other factors should be taken into account, or even dismantled and repaired to eliminate the failure factor.
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Analysis of the Large Demand in the Domestic Refrigerator Market
Due to the large demand of the domestic refrigerant market, domestic smart distributors have been unable to hold back. The 12th Five-Year Plan's support and guidance for the environmental protection and energy conservation industry is now the golden time to grasp the refrigerant replacement and transformation, and it is also to grab the most advantages. A vast opportunity to replace the market.