The Design And The Key Technology Problems Study Of The Cooling Fan For Transformer Of CRH380A High-speed Emus

In recent years, the parts of cooling fans for the high-speed emus was mostlyimported. The imported fans can meet the cooling requirements on the side ofperformance, but there are a serious of problems such as the relatively high cost、longpurchase cycle of spare parts、inconvenient maintenance and backward of after-saleservice and so on. Designing the cooling fans for transformer of CRH380A high-speedemu independently and localized them is imperative.In order to solve the key technology problems such as low vibration、low noise、compact struction and strict protection requirement. The traditional theoreticalcalculation is used for the fan selection and pneumatic calculation analysis, at thesame time ANSYS-CFX was used to simulate the established numerical model of thefan. This paper focuses on elaborating the overall structure design of the fan and theresearch process of the key technology problems. In addition, ANSYS was used toanalysis the strength of impeller&casing and the modality of the fan. Finally the typetesting was done to verified the performance indicators of the fan.The results show that the design and research of the cooling fan for transformerof CRH380A high-speed emus solved the key technology problems which existed onthus fans. The fan used the technology of twin-impeller and the advanced wing profile.The blades of impeller and stator blades were both layout carefully. Previoustechnology made the fan’s static pressure is1100Pa, the flow is171m3/min, thevibration value is less than2.8mm/s and the noise is lower than94dB(A). The fanalso had characteristic of high protection grade and convenient maintenance whichconformed to the technical requirements that the faster speed of the emus、the largecapacity of transformer and high elimination of heat.