The moisture in the sealed refrigeration unit
the Main source of education of most impurities and contamination of the working environment is moisture. In this regard, the requirements of modern technology Assembly sealed units in the process of making or repairing the concentration of moisture in the internal system should not exceed 10×10 St mass % of the working environment. This is ensured by the requirements of GOST 5546-86 and GOST 19212-87 to moisture of refrigerant and oil prior to filling, as well as air or nitrogen, which drained the elements of the sealing system. Thus, the dew point of the air must conform to 55 ºC humidity oil should be no more than 5×10-St mass % of the working environment, humidity halon no more than 6×10-St. mass % of the working environment. However, meeting these requirements does not preclude the presence of moisture in a sealed system.
Moisture can be in the composition of the air remaining after evacuation, to stand out from flux and solder used in the Assembly process, and of the elements of the refrigeration unit, especially of insulating the windings built-in electric motor bladenboro compressor.
Education of moisture during operation of the refrigeration machine may also be due to chemical reactions between the components of the working environment. Moisture is created from the decomposition of the hydroperoxide, which is the intermediate product of the oxidation of refrigeration oils and hydrolysis of R22 refrigerant. The resulting accumulation of moisture react with components of the working environment and the details of the refrigeration unit.
the Water interacts with R12 refrigerant, forming hydrochloric acid. A similar result is obtained by hydrolysis of refrigerant R22, which may be present in the system as a result of interaction of lubricating oil and refrigerant R12. The intensity of chemical reactions increases with increasing temperature at the catalytic action of the metal parts of the refrigerating unit. However, the moisture causes the oxidation of the copper piping, aluminum evaporators, steel parts bladenboro compressor. When the output of the throttle device as a result of evaporation of the refrigerant and the temperature drop of the water allocated in the form of ice, which clogs the flow area of the capillary tube. The flow of the refrigerant in the evaporator is stopped, and the refrigerant is accumulated in the capacitor. This can lead to an overload of the compressor, the breakage of the injection valves. This effect is observed in the presence of moisture in a sealed system unit quantity 50......100 mg. Thus, the presence of moisture in a sealed system, even in small amounts, leads to the formation of hydrochloric and fluoric acid, oxide and carbon dioxide, that can significantly affect the efficiency of the refrigeration machine. Thus, the concentration of hydrochloric acid more than 1G/kg lubricating oils HF-12-18 ( 16) causes the destabilization of the complex of copper. The result is the deposition of copper on steel tribocharging parts bladenboro compressor, and iron by electrochemical currency moves in oil - hladikova mixture.Salt and fluoric acid cause accelerated aging of the lacquer insulation of stator windings built-in electric motor, and changing the properties and the structure of the lacquer insulation is accompanied by release into the production environment following extractables: sludge, varnish, resin, hard resin particles. Hydrochloric acid, interacting with the inner surfaces of the elements, aggregates, destroys them, forming metal salts (ferric chloride, aluminium chloride, and others).