How to detect inferior refrigerants? What's the harm? _Maintenance

　　【】1. Detecting the authenticity of refrigerants 　　 Inferior refrigerants will affect the performance and stability of the system, and more seriously will cause damage to the system components and compressors. The following methods can be used to distinguish whether it is a low-quality refrigerant:

　　1, connect to a pressure gauge test, if the measured pressure value is lower than the corresponding saturation pressure value at the ambient temperature by more than 2kg/f, It can be judged that this refrigerant is unqualified, and it is strictly forbidden to use it!

　　 Example: The ambient temperature is 20 degrees, and the measured pressure value is 7.1kg/f, which is much lower than the saturation pressure value of 13.5kg/f that the refrigerant should reach at this temperature. This can be judged The refrigerant is unqualified.

　　2, foam detection method, foam detection method is effective for refrigerants containing corrosive gases such as methyl chloride, and the corrosion of foam The degree is related to the content of methyl chloride. The higher the content, the more obvious the effect, and the lower the content, the less obvious the effect. 3. Turn the refrigerant tank upside down and release a small amount of refrigerant onto a piece of white paper. There are obvious impurities or liquid water on the paper, indicating that the quality of the refrigerant is not good, and it is not recommended to use it. In addition, refrigerants that can be purchased through regular channels, such as refrigerants whose prices are significantly lower than the market prices, should arouse a high degree of vigilance.

　　4. If you have test conditions, it is recommended to check the purity and acidity of the refrigerant before using it. It is not recommended to use refrigerants whose test results are significantly lower than the industry standard. Note: The purity of qualified R22 refrigerant should be greater than 99% (the purity of high-quality refrigerant is greater than 99.8%), and the acidity should be less than 0.0001.

　　5. During the system debugging and operation stage, no other abnormalities were found after inspection, and the refrigeration capacity was insufficient; the dryer or expansion valve was blocked, and the blockage was yellow-brown waxy or black For sludge-like foreign objects, it is recommended to extract refrigerant from the system for purity testing to troubleshoot the risk of inferior refrigerants.

　　 Second, the impact of refrigerant purity on the system The refrigerant is the blood of the compressor, and the purity of the refrigerant is particularly important for the cold storage refrigeration equipment. The most obvious phenomenon is: filled with high purity Refrigerant cold storage has obvious refrigeration effect, rapid temperature decline, and large refrigeration capacity; low-purity refrigerants not only fail to reach the desired temperature drop, but also damage the compressor. So what are the negative effects of low refrigerant purity?

　　 1. High water content and high acidity severely corrodes the internal pipeline system of the compressor, causing blockage in the compressor and shortening the service life of the compressor.

　　2, it is easy to leak, there is no fluorine in the refrigeration system, the compressor has been idling, the operating temperature is high, and the parts are worn out, which will also shorten the service life of the compressor.

　　3. Increase the operating load of the compressor, increase the consumption of electric energy, and increase the expenditure.

　　4. The cooling effect is poor and the problem is frequent. Although the inferior quality refrigerant will temporarily feel cool, the temperature is always difficult to drop, and the expected cooling effect cannot be achieved.