- Contact：Mr. Song
- Phone：0086-13705113637
- Tell：0086-0515-88809180
- Fax：0086-0515-88809181
- E-mail：jsjckt@126.com
- Address：No. 18, Rongguang Road, National High-tech Park, Yancheng City, Jiangsu Province
Refrigeration system is a general term for refrigerant flowing through equipment and pipelines, including compressors, condensers, throttling devices, evaporators, pipelines and ancillary equipment, which is the main component of air conditioning equipment, cooling and refrigeration equipment.
The refrigeration system blockage failure has ice blockage, dirty blockage and oil blockage and other forms, the unified fault characteristics of blockage are: the hand condenser is not hot, the evaporator is not cool, the compressor running current is smaller than normal, the pressure gauge is connected to the bypass charging valve, indicating negative pressure, the outdoor unit running sound is light, can not hear the liquid sound in the evaporator.
Causes of ice blockage and fault phenomena
The occurrence of ice blockage fault is mainly due to the excessive water in the refrigeration system, with the continuous circulation of refrigerant, the water in the refrigeration system gradually concentrated at the capillary outlet, because the temperature at the capillary outlet is the lowest, the water formed ice and gradually increased, to a certain extent, the capillary will be completely blocked, the refrigerant can not be recycled, the refrigerator is not refrigerated.
The main source of water in the refrigeration system is: the motor insulation paper in the compressor contains water, which is the main source of water in the system. In addition, the residual moisture of the components of the refrigeration system and the connecting pipes due to insufficient drying; The refrigerant oil and refrigerant contain more than the allowable amount of water; During assembly or maintenance, the pipeline is in the development state for a long time, resulting in moisture in the air being absorbed by the motor insulation paper and freezer oil. Due to the above reasons, the water content of the refrigeration system exceeds the allowable amount of the refrigeration system, and ice blocking occurs. On the one hand, the ice blockage causes the refrigerant to fail to circulate and the refrigerator can not refrigerate normally; On the other hand, water will also chemically react with the refrigerant to generate hydrochloric acid and hydrogen fluoride, resulting in corrosion of metal pipes and components, and even damage to the insulation of the motor windings, and also cause deterioration of the refrigerated oil, affecting the lubrication of the compressor. Therefore, the moisture in the system must be controlled to a minimum.
The performance of ice blocking in the refrigeration system is that the initial stage works normally, the evaporator frosts, the condenser dissipates heat, the unit runs smoothly, and the refrigerant activity sound in the evaporator is clear and stable. With the formation of the ice block, the air flow can be heard to gradually weaken and intermittently. When the blockage is serious, the air flow sound disappears, the refrigerant circulation is interrupted, and the condenser gradually becomes cool. Due to the blockage, the exhaust pressure increases, the machine operation sound increases, there is no refrigerant inflow in the evaporator, the frosting area gradually becomes smaller, the temperature also gradually increases, and the capillary temperature also rises together, so the ice begins to dissolve, and the refrigerant begins to recircuate. After a period of time, the ice blockage occurs again, forming a periodic through-blockage phenomenon.
Causes of dirty plugging and fault symptoms
The formation of dirty plugging fault is caused by excessive impurities in the refrigeration system. The main sources of impurities in the system are: dust and metal debris in the manufacturing process of the refrigerator, the oxidation layer on the inner wall of the pipeline is dropped off during welding, the internal and external surfaces of various parts are not cleaned during processing, the pipeline seal is not strict, dust enters the pipe, the refrigerant oil contains impurities, and the poor quality desiccant powder in the dryer filter. When these impurities and powder flow through the filter dryer, most of them are removed by the filter dryer. When there are more impurities in the filter dryer, some small dirt and impurities are brought into the capillary tube by the refrigerant with higher flow rate, and are retained and accumulated in the part with greater resistance in the bending section of the capillary tube. The resistance is increasing, so that the impurities are more easily retained until the capillary tube is blocked. The refrigeration system cannot be cycled until. In addition, the distance between the capillary tube and the filter screen in the filter dryer is too close, and it is easy to cause dirty blockage failure; In addition, it is also easy to weld the capillary tube mouth when welding the capillary tube and the filter dryer.
After the refrigeration system is dirty and blocked, because the refrigerant can not be circulated, the compressor runs continuously, the evaporator is not cold, the condenser is not hot, the compressor shell is not hot, and there is no airflow in the evaporator. If partially blocked, the evaporator has a cool or cold feeling, but does not frost. Touch the outer surface of the filter dryer and capillaries to feel very cool, frosty, and even a layer of white frost. This is because when the refrigerant flows through the micro-blocked filter dryer or capillary, the throttling and pressure reducing effect is generated, so that the refrigerant flowing through the blockage will expand, vaporize, and absorb heat, resulting in dew or frost on the outside surface of the blockage.
The difference between ice blocking and dirty blocking: After a period of time, ice blocking can restore refrigeration, form a short time to pass, a short time to block, blocked again, and blocked again. And after the dirty blockage occurs, it can not be cooled.
In addition to the dirty blockage of the capillary, if the system has more impurities, it will gradually block the dryer filter, because the filter itself has a limited capacity to filter dirt and impurities, and it will be blocked due to the continuous accumulation of impurities.
Declaration: The content and template of this article from the network, and the copyright belongs to the original author; If there is infringement, please inform in time and contact to delete.
Industrial air conditioning, chemical fiber industrial air conditioning, chemical fiber industry refrigeration ,textile industrial air conditioning , dust-free workshop cooling, ventilation pipeline, cooling tower, freezer and other air conditioning units and accessories.
Jiangsu Jincheng Air Conditioning Engineering Co., Ltd. is a comprehensive manufacturer of special air-conditioning equipment design, production, installation, and commissioning of clean room, electricity, tobacco, civil air defense engineering, medical clean room, clean room, electricity, tobacco, civil air defense engineering, medical clean room. Mainly produce JCZK combined air conditioning unit, cooling tower, glass steel ventilated galvanized sheet pipe, stainless steel pipe, polyurethane ventilation pipe and air conditioning accessories, Jincheng air conditioner is wide, the type, the unique model, superior performance, and user Favused.
