Design and research on the cooling device with heat pipe of the car LED headlights

  In recent years, the light -emitting diode (LED) is gradually becoming our light source in this century. The application in the automotive field is becoming more and more extensive, and it is about to become the main light source of automobiles in the new era. However, because the front -light LED headlights have a large power and high thermal density, the efficient and fast heat dissipation in the closed and small space restricts the development of the car LED headlights; It will also affect the service life of LEDs. How to solve the problem of heat dissipation in high -power LED car headlight lighting has always restricted the development of high -power LED car headlights. This article conducts the following research and design of the cooling problem of car LED headlights. First of all, after analyzing and comparing various heat dissipation methods and heat dissipation structures, combined with the current development status of LEDs. Design through SolidWorks software design with high -power LEDs as a light source car front light, each equipped with three different heat pipe based radiators, namely: heat pipe heat sink; flat micro heat pipe radiator and the radiator of pulsating heat pipes Essence The main features of these three radiator are simple structures and high efficiency. At the same time, it is suitable for production to meet the current car halogen headlights to LED headlight modification. Secondly, the representative micro -heat pipe LED bulk radiator model is introduced into ANSYS Workbench analysis software, and the temperature simulation data of the front end of the radiator and the temperature simulation data of the radiator at the front of the radiator through the temperature simulation chip node. The theoretical qualitative analysis Calculate whether the micro -heat pipe radiator meets the high probability of the heat dissipation needs of the LED headlights and whether it meets the economic energy saving and environmental protection performance of the radiator. During the simulation process, for the different operating conditions of the lamp, the effects of parameters such as thermal resistance, ambient temperature, and wing tablet on the heat exchange coefficient on the heat sink were studied. The results show that in the environment of normal work, when the power of the LED light is 60W, the temperature of the LED node is 67 ° C, and the heat resistance of the radiator is stable at 0.61k/w; the complex environmental temperature and high power conditions, the LED knot is The point temperature is lower than 120 ° C, and the conversion coefficient on the wing tablet is greater than 80W/m ~ 2 · k. Finally, we have a feasibility of verifying that the car LED headlight microstatic radiator is available. By setting up an experimental platform, the temperature of the node temperature and the end temperature of the radiator, the results show that the temperature of the micro heat pipe radiator noder temperature is 50W node temperature at 60 ° C, the end temperature at the end is 30 ° C, and the start time of the micro heat pipe is 3min. Then, the three different media acetone, ethanol, and distilled water have different liquid rates on heat pipe heat dissipation performance. Experimental results: The best effect of acetone, the minimum node temperature is 52 ° C. The charge ratio is 30-40%for the best liquid rate. Through the simulation and verification test of this article, it is obtained by the heat pipe -based technology. The headlights of the car LED are a good direction of exploration. To some extent, the node temperature of the LED headlight effectively effectively reduces the node temperature of LED headlights. Improved the heat dissipation efficiency of LED and enhanced the service life of LED headlights. It also shows that the new type of heat pipe radiator can meet the LED headlights heat dissipation requirements.