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Heat Transfer Features of Hydraulic Top Drive Deceleration System

Zhao Dajun1,Kui Yanlong1,Wang Jixin2,Sun Youhong1,Zhang Qiang1,Qian Fang1,Yang Huwei1 1.College of Construction Engineering,Jilin University,Changchun 130026,China 2.College of Mechanical Science and Engineering,Jilin University,Changchun 130022,China  
In order to solve the cooling system computational problems of large-torque and high-rotation-speed hydraulic top drive,a power and thermal resistance calculation model in MATLAB/SimPowerSystems was built up on the basis of electro-thermal similarity principle to analyze the distribution law of the steady heat of the deceleration system.According to the thermal network characteristics,the convective heat transfer coefficients which seriously affect the temperature calculation accuracy were extracted from the thermal resistance of convective heat transfer,and a dynamic changing model was established to improve the applicability and accuracy of the thermal network calculation.Useing the balance model of the heat production and dissipation inside the top drive,the thermal dissipated power under different conditions were analyzed.Results concluded that drill string tension have great influence on total generated thermal power inside top-drive system,and the total thermal power,under a certain condition,was distributed proportionally without the effect of the drill string tension and the drilling speed.In the meantime,the gear surface and the center of the thrust bearing take a higher temperature.The temperature in the centric thrust bearing rises linearly with the increase of drill string tension,where will generate more thermal energy and lead to a rapidly excessive temperature.
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