Will the amount of refrigerant cause frost in the return pipe and compressor?

　　【】As far as air conditioners are concerned, generally speaking, the principle of system circulation is no different from refrigerator freezers. The symptoms of air conditioner systems are similar to those of refrigerator freezers when they are deficient in fluoride. Many people say that the air conditioner is deficient in fluoride and the thick tube (return pipe) Frosting occurs. In fact, under rated air conditioning conditions, the air conditioning system lacks fluorine and then the return pipe frost is not easy to occur. After the lack of fluorine, the return pipe temperature will only be higher than normal, that is, the return air overheating temperature is higher than normal, and then the refrigeration The common sense of the circulation principle is that there are certain conditions for the fluorine return pipe to be frosted. The indoor temperature is low or the internal machine ventilation and heat exchange are poor; the ambient temperature is low and the machine runs for a long time, and the evaporator starts to frost from the entrance. The more knots, the more the evaporator will fill up to the return pipe, this is possible, but the argument that the return pipe will be frosted when lack of fluoride is not true under all circumstances.

　　How can the return pipe of refrigeration appliances be frosted? Under what circumstances will it be frosted? Scientific ethics and logic must be used to explain this problem.

　　 household air conditioner, taking R22 refrigerant as an example, its saturated gauge pressure at 0 degrees is 0.399MPa, when this pressure is lower than the corresponding temperature of 0 degrees, it is the crystallization point (freezing point) of water ), of course, the outer surface of the tube will condense first and then frost. This is a normal physical reaction and change. Therefore, after the low pressure of the household air conditioner is lower than 0.399MPa, the connecting pipe will start to frost.

　　The refrigerants used in household refrigerators and freezers are R12, R134a, R600a, etc. When the saturation pressure of R12 refrigerant is lower than 2.11kg, the saturation pressure of R134a refrigerant is lower than 0.193MPa, and the saturation of R600a refrigerant After the pressure is lower than 0.058MPa gauge pressure, its saturation temperature is 0 degrees or below. When the temperature is below 0 degrees, if more refrigerant is added to the system at this time, the refrigerant in the evaporator cannot be fully heat exchanged ( Heat absorption) produces boiling (evaporation). If the superheat of the return air is too small, the liquid refrigerant will enter the return air pipe or even the compressor, which will inevitably cause frosting of the return air pipe and even the compressor.

The difference between 　　 cold storage is that according to the thermal properties (physical and chemical properties) of the refrigerant used, as well as the evaporation temperature and return air superheat specified by the system, when the superheat is too small, such as the opening degree of the expansion valve If it is too large, or the refrigerant in the system is too much, if the liquid level in the evaporator is too high (too much), the return air will entrain over-moisture and over-humid gas, and the compressor may cause liquid shock and frost. .

　　 These are different systems. Under different refrigerants and different corresponding pressures and temperatures, different reactions occur. It is also the reaction of the specific thermal conditions of the refrigeration system. This is a basic problem that is easy to understand. , Don’t misunderstand and confuse it!

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