【作者】 陈明；

【导师】 吕卫文；

【作者基本信息】 华中科技大学 ， 材料工程， 2016， 硕士

【摘要】 LED工矿灯从安全性能、控制性能、使用寿命、耗电量、启动时间上都远优于传统工矿灯,因而LED工矿灯在全球得到广泛应用。由于市场对LED工矿灯的认可,对其功率和散热也有了更为严格的要求,然而目前所使用的LED工矿灯仅仅是通过铝材散热,已经无法满足其散热要求。本文设计了一款一体化重力热管LED工矿灯,通过两相流的方式代替传统导热硅脂+机械固定的方式,大大减少了LED工矿灯的总热阻,并且通过重力热管良好导热性能和均温性能来提高散热器的使用效率和降低COB的结温。首先对一体化散热器和一体化重力热管进行设计。其次通过ANSYS稳态温度场模拟和正交试验对一体化重力热管散热器尺寸进行优化,通过正交试验获得一体化散热器尺寸对COB结温和散热器质量的影响程度,使用综合加权法得到其最佳尺寸:翅片长度H=55mm,翅片厚度t=2mm,热管直径D1=10mm,中间圆柱直径D2=52mm。再次对一体化重力热管LED工矿灯进行制造,其制造过程包括化学清洗、散热器凸台镀铜、钎焊、检漏、抽真空灌液以及封口。其中对散热器凸台进行化学镀铜前需要二次浸锌预处理,采用低温钎焊将COB光源与散热器进行连接,并且搭建一套真空系统。最后本文通过正向电压法得到一体化重力热管LED工矿灯的结温;并通过温度采集卡对LED工矿灯COB光源表面A点、散热器底部B点、散热器中部C点、散热器顶部D点进行了测试。通过正向电压法测得一体化重力热管LED工矿灯的结温为82.5℃;对一体化重力热管有无充工质的四个点的温度进行测试对比,得到一体化重力热管未充工质时A点的温度稳定在77.5℃,而一体化重力热管充工质时A点温度为65.3℃,温度降低了12.2℃;一体化重力热管未充工质时B、C、D点温度分别稳定在52.3℃、43.6℃、40.5℃,一体化重力热管充工质时B、C、D点的温度分别稳定在54.5℃、49.4℃、47.8℃,一体化重力热管充工质和未充工质时B、C、D三点的平均温度间隔分别为3.3℃、5.9℃。更多还原

【Abstract】 LED mining lamp from the security performance, control performance, service life,power consumption, start time are far superior to the traditional miner’s lamp and LED mining lamp get widely used in the world. With the promotion and popularization, market of LED mining lamp power and cooling proposed higher requirements. At present, only rely on aluminum thermal conductivity can not meet the requirements of LED industrial and mining lamps. In this paper, we design a integrated gravity heat tube LED mining lamp, by two-phase flow instead of the traditional thermal grease and mechanical fixation, greatly reducing the total thermal resistance of the LED mining lamp, and through the gravity heat pipe with good heat conductivity and temperature uniformity can improve the efficiency of the heat sink and reduce the junction temperature of COB.Firstly, the design of the integrated gravity heat pipe LED mining lamp is designed,including the design of the integrated radiator and the design of the integrated gravity heat pipe. Secondly,by using ANSYS steady-state thermal simulation and orthogonal test of the integrated gravity heat pipe radiator size LED mining lamp to optimize the design, by orthogonal test and range analysis method get the dimensions of radiator of COB node degree of influence of mild radiator quality. Then, using comprehensive weighted method the optimal size: fin length H=55mm, fin thickness t=2mm, heat pipe diameter D1=10mm,central cylinder diameter D2= 52 mm. Thirdly,the integrated gravity heat pipe LED mining lamp manufacturing, the manufacturing process including chemical cleaning, convex radiator copper plating, brazing, leak testing, vacuum pumping liquid filling and sealing, the boss of the radiator are secondary leaching zinc pretreatment for electroless copper plating,and the COB light source and the radiator are connected by low temperature brazing; and build a set of vacuum system of the integrated gravity heat pipe vacuum and liquid filling.At the end of this paper, by the method of forward voltage measured LED-COB source junction temperature; through temperature acquisition card of LED mining lamp COB source surface point A, the radiator bottom point B, radiator central point C, the radiator points D were tested.The junction temperature by the forward voltage measured by integrated gravity heat pipe LED mining lamp is 82.5 centigrade; The temperature of A, B, C and D of the integrated gravity heat pipe is tested and compared. The temperature of the A point of the integrated gravity heat pipe is stable at 87.4 centigrade, while the temperature of the A point of the integrated gravity heat pipe is 73.9 centigrade, and the temperature is reduced by 13.5centigrade; The temperature of B, C and D in the integrated gravity heat pipe is stable at52.3 centigrade, 43.6 centigrade and 40.5 centigrade, The temperature of B, C and D points are stable at 54.5 centigrade, 49.4 centigrade and 47.8 centigrade when the integrated gravity heat pipe is filled with working fluid. The average temperature interval of B, C and D three points in the integrated gravity heat pipe and the working fluid is 3.3centigrade and5.9 centigrade.更多还原