For enterprises, if they want to extend the service life of LED street lights, they must solve the problem of LED chip heat dissipation. In this way, we can take advantage of many LED street lamp products.
Generally speaking, the ways of heat dissipation are mainly divided into heat conduction, heat convection and heat radiation. Generally speaking, the heat generated by LED chips first passes through the LED package structure, circuit board and heat dissipation structure in the way of heat conduction, and finally transmits the heat to the external environment in the way of heat convection and heat radiation, so as to reduce the heat accumulation inside the lamps and reduce the impact of temperature on the energy-saving effect and service life of LED lamps.
At present, most of the LED street lamps with aluminum radiator in the market only highlight the role of heat transfer. In terms of heat convection and radiation, due to technical limitations and other reasons, no more optimization design has been done. However, in the face of the problem of LED street lamp heat dissipation, it has not stagnated.
The LED street lamp and other products are designed and developed on the basis of independent ceramic heat dissipation technology, and the three basic (heat transfer) heat dissipation modes are fully considered. In the study of the natural convection heat exchange mechanism of heat dissipation structure, the causes of fluid flow, fluid phase change, fluid flow state, physical conditions of fluid and geometric factors of heat exchange surface are deeply studied After that, the design of "hollow structure" is put forward.
That is to say, at the same time of taking into account the use function and beauty of the lamp, a number of heat dissipation holes are opened on the upper cover and the bottom plate of the lamp. The heat inside the lamp is directly transmitted to the radiator through heat conduction, and then the heat is dissipated to the air through natural convection (one of the convection modes). That is to say, the temperature difference between the inside and outside of the lamp makes the density of cold and hot air different. The density of hot air with high temperature is small and will inevitably rise; the density of cold air with low temperature is large and will inevitably fall. In this way, the temperature between hot air and cold air tends to be uniform through circulation, so as to realize real-time heat emission, avoid "heat island effect", reduce PN junction temperature, and improve product service life. In addition, natural convection, as a reliable passive cooling mode, does not need other auxiliary spare parts, and has low maintenance cost. It is an efficient and reliable cooling mode.
So far, this "hollowing out" structure has been widely applied in street lighting, LED tunnel lights and other road lighting products, household perpetual lamp and bulb lamp, etc. it has effectively solved the problem of heat dissipation of lamps and improves the reliability and longevity of products.