With the development of LED explosion-proof materials and packaging technology, the brightness of LED explosion-proof products is getting higher and higher, and the application of LED explosion-proof lamps is becoming more and more widespread. Led explosion-proof lamps are used as backlights of displays. Explosion proof flashlight is used to provide mobile lighting in fire fighting, power, industrial and mining enterprises and other flammable and explosive places. It is applicable to geological exploration, tourism exploration, border patrol, coastal patrol, disaster rescue, field operation, tunnel operation, airport patrol, railway patrol, archaeology and fire command, criminal investigation, traffic accident handling, power maintenance and other field operations. However, the heat problem is the main obstacle restricting the development of LED explosion-proof lamps as lighting objects.
The research on cooling methods and heat dissipation materials of LED explosion-proof lamps has become the first step of many explosion-proof manufacturers. The following are descriptions of some thermal methods and materials for reference.
The cooling mode of LED explosion-proof lamps is subdivided in terms of cooling mode, which can be divided into air cooling, water cooling, heat pipe cooling, semiconductor cooling, chemical cooling, etc.
1. Air cooling
Air cooling is the most commonly used cooling method, and it is also a cheap cooling method. The essence of air cooling and heating is to use fans to remove the heat absorbed by radiators. The utility model has the advantages of relatively low price, convenient installation and the like. However, due to its high dependence on the environment, such as temperature rise and overclocking, it will have a significant impact on the thermal performance.
Led explosion-proof lamp
2. Liquid cooling
The liquid cooling cooling is that the heat of the radiator is forcibly removed by the liquid driven by the pump. Compared with the air cooling, this utility model has the advantages of quiet and stable cooling and less dependence on the environment. The price of liquid cooling is relatively high and it is troublesome to install. In addition, during installation, it is helpful to achieve heat dissipation effect according to possible installation methods. For the sake of cost and convenience, water cooling generally uses water as the heat-conducting liquid, so water-cooled radiators are also called water-cooled radiators.
3. Heat pipe
The heat pipe is a heat transfer element that makes full use of the heat transfer principle and the fast heat transfer characteristics of the cooling medium. Explosion proof headlights Mini explosion-proof headlights are indispensable and important equipment for outdoor activities. Energy saving technologies such as LED cold light technology and the innovation of high-grade headlights are incomparable to electric lamps with civilian prices. Therefore, headlights can replace flashlights, but flashlights cannot replace headlights. In a completely sealed vacuum tube, the evaporation and condensation heat transfer of liquid has the advantages of high thermal conductivity, good isotherm, random changes in the heat transfer areas on both sides of the cold and warm, long heat transfer distance, and controllable temperature. Heat pipe heat exchanger has the advantages of high heat transfer efficiency, small structure and small fluid resistance loss. Its thermal conductivity is much higher than that of known metals.
4. Semiconductor cooling.
Semiconductor refrigeration is a special kind of semiconductor refrigeration plate, which will cause temperature difference when electric power is cooled. As long as it can effectively release heat at high temperature, the low-temperature mass will continue to cool. Each semiconductor particle has a temperature difference, and the cooling plate is connected by dozens of such particles, forming a temperature difference on the two surfaces of the cooling plate. Using this temperature difference phenomenon, combined with air cooling / water cooling, to cool the high-temperature section, a good cooling effect can be achieved. Semiconductor cooling has the advantages of low cooling temperature and high reliability. The temperature of the semiconductor cold surface can rise below - 10, but the cost is too high and the temperature is low, and short circuits may occur. At present, the technology of semiconductor refrigeration plate is not mature enough to meet the requirements of practical application. The so-called chemical refrigeration is to use ultra-low temperature chemicals to absorb a large amount of heat and reduce the temperature when melting. In this regard, the use of dry ice and liquid nitrogen is more common.
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