Several solutions to the frost on the air return port of the cold storage compressor are recommended
发布时间：
2015-12-17
The compressor is an indispensable machine in the refrigeration of cold storage, but various problems will be encountered during the use process. The most common one is the frosting of the air return port of the cold storage compressor, so how to deal with this problem? Yanghu Xiaobian recommends a few points for everyone: Frosting at the air return port of a cold storage compressor is a very common phenomenon in the refrigeration system. Under normal conditions, it will not immediately cause a system problem, and fine frosting generally does not need to be dealt with. With some cold storages Changes in working conditions will improve or aggravate the phenomenon. If the frosting phenomenon is serious, then you need to find out the cause of the frosting first. If the return air temperature of the compressor is low, the return air will generally appear at the same time.
The compressor is an indispensable machine in the refrigeration of cold storage, but various problems will be encountered during the use process. The most common one is the frosting of the air return port of the cold storage compressor, so how to deal with this problem? Yanghu Xiaobian recommends a few points for everyone: Frost at the air return port of a cold storage compressor is a very common phenomenon in the refrigeration system. Under normal conditions, it will not immediately cause a system problem, and fine frosting generally does not need to be dealt with. With some cold storage Changes in working conditions will improve or aggravate the phenomenon. If the frosting phenomenon is serious, then you need to find out the cause of the frosting first. If the return air temperature of the compressor is low, it will generally show low return air pressure and high amount of refrigerant of the same volume at the same time. The root cause of this situation is that the refrigerant flowing through the evaporator cannot fully absorb itself and expand to the predetermined pressure and temperature value. The required heat causes the temperature, pressure and volume of the return gas to be relatively low. There are two reasons for this problem: 1. The evaporator cannot absorb heat normally, or the cold energy generated by the evaporator cannot be taken away. The appearance is that the temperature and pressure of the return liquid are normal or slightly low. Frost starts to gradually form from the compressor's return port to the evaporator. After a long time, all the ice forms from the compressor's return port to the evaporator and from the throttle valve to the evaporator. , and finally a low pressure. 2. Due to the small amount of refrigerant and the low evaporation pressure of the evaporator, the evaporation temperature is low, which will gradually lead to the condensation of the evaporator to form a thermal insulation layer, which will transfer the expansion point to the return air of the compressor, resulting in frosting of the return air of the compressor. If the amount of fluorine is normal or excessive, and if the high pressure pressure is low due to conditions such as excessive condensation and heat transfer, then the refrigerant at the front end of the throttle valve with the same volume will show low pressure and high quality. At the initial throttle valve opening, the quality of the refrigerant liquid flowing through the throttle valve will be higher than normal, and the heat required to be absorbed from the evaporator will also be higher. If the corresponding heat cannot be completely absorbed from the evaporator, it will cause the compressor to return. The trachea temperature is low. At the same time, due to the low pressure at the front end of the throttle valve, the pressure at the rear end of the throttle valve will also be low. If the expansion valve is used in this cold storage installation system, (detecting the temperature and pressure of the return gas pipe, the opening of the pipe is reduced, the opening of the pressure is reduced, and the opening is increased) compared with the normal state, the opening will not be adjusted too much, then it will maintain Low pressure condition until compressor return air frosts. This seems to be a phenomenon of lack of fluorine (high pressure, low pressure and low pressure), and the low temperature of the return gas pipe leads to frost. Finally, remind everyone that if the outlet of the evaporator freezes and reduces the superheat of the return air! There may be too much refrigerant! Because one of the necessary conditions for the freezing of the evaporator is that the evaporation temperature must be lower than 0 degrees! And refrigeration Too much agent will just cause the evaporation temperature to rise!
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