How to distinguish inferior refrigerants? What effect does refrigerant purity have on the system?

　　【】Inferior quality 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. Whether to purchase refrigerants produced by regular manufacturers through formal channels, such as refrigerants whose prices are significantly lower than the market prices, should be highly vigilant.

　　2. If you have the test conditions, it is recommended to check the purity and acidity of the refrigerant before using it. It is not recommended to use the refrigerant 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 (in HCL) should be less than 0.0001.

　　3. If you do not have the refrigerant detection conditions, it is recommended to perform a simple inspection before using the refrigerant. The simple inspection method can be:

　　[1], refrigerate The tank is turned upside down and a small amount of refrigerant is released onto a piece of white paper. If there are obvious impurities or liquid water on the white paper, it means that the quality of the refrigerant is not good and it is not recommended;

　　[2] , Connect the pressure gauge to test the pressure of the refrigerant bottle, and check whether the pressure in the bottle is within the normal range according to the temperature and pressure characteristics of the refrigerant. And when the refrigerant is half used, the pressure in the bottle can be tested again. For a single-component refrigerant such as R22, the two measured bottle pressure values u200bu200bshould be very close, but for inferior refrigerants, multiple components are usually mixed. After the internal refrigerant is used, due to the change of the composition ratio, the bottle pressure usually has a big difference. If such a phenomenon is encountered, it is recommended to stop the refrigerant immediately and discharge the refrigerant that has been charged into the system to avoid it. Pollution system.

　　4. In the system debugging and operation stage, if the following abnormal phenomena are found:

　　[1], the system refrigeration capacity is obviously insufficient and no other abnormalities are found after inspection, you need to pay attention to the refrigerant ;

　　[2], when the system dryer filter or expansion valve is clogged, and the clogging is yellow-brown wax-like or black sludge-like foreign matter, pay attention to the refrigerant;

　　[ 3]. High and low pressure or temperature abnormalities occur during system operation, or the system balance pressure is abnormal when the system is stopped (refer to the refrigerant temperature and pressure characteristics table), and attention should be paid to the refrigerant. When these abnormal phenomena occur, it is recommended to extract refrigerant from the system for purity testing to troubleshoot the risk of inferior refrigerant. During this period, it is recommended to empty the refrigerant on the compressor side or release the refrigerant from the entire system to avoid potential inferior refrigerant from contacting the compressor and damaging the compressor.

　　 Once it is discovered that the unit components or compressors are faulty due to chemical pollution caused by inferior refrigerant, the units that used the same source of refrigerant in the site (even if the unit is still working) need to be replaced. Agent. Because the influence of harmful chemical components in low-quality refrigerants is sometimes slow, it may cause system failure after a long period of use.

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 cold storage refrigeration equipment. The obvious phenomenon of z* is: high-purity refrigeration is charged The refrigerating storage of refrigerant has obvious refrigeration effect, rapid temperature decrease and large refrigeration capacity; low-purity refrigerant not only fails to reach the required temperature decrease, but also damages 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. Some inferior refrigerants are even mixed with a lot of flammable and explosive gases, which seriously affect the safety of people's lives and properties.

　　5. Poor cooling effect and frequent problems. Although the inferior quality refrigerant will temporarily feel cool, the temperature is always difficult to drop and the expected cooling effect cannot be achieved.

　　6. Freon in the refrigerant, once leaked, it will destroy the ozone layer and cause great harm to the atmosphere on which humans depend.

　　 　　 refrigerants have made a great contribution to changing the living environment of human beings, but people’s understanding of refrigerants has remained at a preliminary stage, thinking that as long as the refrigerant is refrigerating, it is enough. In fact, the original refrigerants from large manufacturers are strictly controlled by the sample inspection, the purity inspection equipment is sophisticated, and the quality is guaranteed. However, some small distributors, driven by huge profits, subpackage the refrigerant produced by the original factory and sell it. The refrigerant equipment for the subpackage is simple and cannot control the contact space between the refrigerant and the air, which will easily lead to the air content in the refrigerant. Exceeding the standard, there is too much water, and the phenomenon of ice blocking occurs after charging the refrigeration equipment. If there is a problem with the refrigeration equipment and the compressor is damaged, it is really not worth the loss.

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