York refrigeration units: repair of issues such as screw compressor vibration and abnormal water temperature!

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YORK is the brand that was among the first in the world to engage in research and development as well as manufacturing of refrigeration equipment. Its refrigeration units, which consist of components such as compressors, condensers, cooling fans, and solenoid valves, are widely used in industries such as food and beverage production, natural gas processing, polysilicon production, and pharmaceutical synthesis, providing services such as gas compression and industrial refrigeration for various enterprises and organizations. When refrigeration units provide cooling services, due to the large number of precision components within them and the way in which these components work together, any issue with one of these components can lead to a failure in cooling performance. Recently, Gonglenghui repaired an RWBII low-temperature unit, which had two problems: 1. The outlet water temperature was set at minus 25 degrees. At the beginning of operation, all parameters of the unit were normal, but once the outlet water temperature reached around minus 10 degrees, the water temperature could no longer drop further. The slide valve was at 50%-60%, and the suction pressure was 20. It was initially determined that the exhaust pressure, suction pressure, superheat, and compressor current were too low, while the temperature difference across the evaporator was too high. 2. Abnormal vibration occurs during the operation of the unit. Faced with such a problem, Gonglenghui analyzed the possible causes of the failure as follows: 1. Given the large temperature difference in the evaporator, it is suspected that the evaporator may be scaled, and the refrigeration oil entering the evaporator leads to poor heat exchange efficiency. 2. Based on the phenomenon of too low evaporation pressure, it is suspected that there may be a lack of refrigerant. 3. Based on the phenomenon of low exhaust pressure, the condensing capacity of the condenser is suspected to be an issue. 4. Possible reasons for abnormal vibration of the unit include loose foundation bolts, misalignment between the compressor and the motor, the slide valve failing to stay in place and causing vibration, excessive vacuum level in the suction chamber, and increased vibration of the unit due to pipeline vibrations. After a thorough inspection of the aforementioned components, it was determined that the water temperature was not within the acceptable range, which ruled out the possibility of scaling in the evaporator. The refrigerant and oil in the recovery unit were removed, cleaned with nitrogen, and then the refrigerant and lubricant were re-added; yet the fault persisted once the unit was turned on. To address the abnormal vibration of the unit, issues such as faulty foot bolts and misalignment of the compressor and motor shafts were resolved; the problem of an excessively open suction stop valve was also fixed. Support points were added or adjusted to deal with the causes of vibration in the pipes. Finally, during inspections of the oil piston and load control valves, leaks were detected. In conclusion, the cause of the abnormal vibration of the unit was identified and the problem was resolved. After conducting a second check on the water temperature issue, the plant’s cooling system detected that the salt concentration in the evaporator was insufficient and did not meet the machine’s specified requirements. As a result, when the unit cooled down to around minus 10 degrees, crystals began to form on the surface of the evaporator’s copper tubes, which affected its heat exchange capacity and caused the evaporation pressure to drop while the temperature difference increased. Thus, the problems related to the water temperature and vibration of the refrigeration unit were resolved. When repairing refrigeration units and compressors, it is necessary to draw on past experience to ensure that we can quickly identify the problems and find appropriate solutions. However, in cases like the water temperature issues mentioned above, we might sometimes overlook these problems, which can result in the refrigeration unit not functioning properly. Or, we might detect that a component such as the evaporator has an insufficient salt concentration and decide to replace it with a brand new one to resolve the issue – but this is a temporary solution rather than a permanent one, and repair engineers need to handle such situations with caution. Shandong Gonglenghui Network Information Technology Co., Ltd. is an industrial Internet company whose vision is to create a one-stop MRO service platform for industrial refrigeration, thereby becoming a trusted partner for its customers. Its e-commerce platform, “Gonglenghui”, operates on a B2B+O2O model to supply customers with lubricants and filters for daily maintenance, as well as sensors, valves, controllers, electrical components, heat exchangers, compressors, and control centers for repairs. It also provides parts such as bearings, seals, shaft seals, rotors, slide valves, balance pistons, and impellers for major overhauls. The platform offers comprehensive remote and on-site technical services. With the mission of \"creating more value for customers through an efficient supply chain and high-quality services in the field of industrial refrigeration,\" it aims to ensure customer satisfaction and deliver value to them at all times. The brands that our company primarily serves at present include York, GEA (Grasso), Wuleng, Daleng, Yancheng, Carrier, Trane, McQuay, and others; we handle the maintenance of these equipment units. Our engineers possess high technical skills, enabling them to carry out maintenance work efficiently and with high quality in terms of equipment repair, system adjustment, and electrical control, while also striving to achieve new results through a sincere attitude.