In terms of heat dissipation, many researchers are exploring effective solutions. The loop heat pipe radiator adopts the loop structure. The working fluid inside the heat pipe is heated and vaporized and the gas circulates under the pressure difference inside the vacuum chamber, It realizes the gas-liquid separation, solves the mutual interference caused by the gas-liquid mixed flow when the common heat pipe works, and greatly improves the heat transfer efficiency of the heat pipe. The annular heat pipe radiator controls the temperature rise of the radiator to be within 18 ° C, so that the LED can operate for a long time under the effective junction temperature and prolong the service life of the LED.
This heat dissipation method of decorative lamp manufacturers is to dissipate heat through circulating heat pipes. The two ends of the loop pipe are the system circuit board (heat source) and the radiator. The inside of the loop pipe is filled with working fluid and equipped with an evaporator. The working principle is: when the system circuit board transmits heat, the working fluid at the heat source absorbs heat and then turns into gas through the evaporator. By virtue of the rapid movement of gas, the heat at the heat source can be quickly transferred to the lamp shell or radiator. Therefore, the heat dissipation of the loop heat pipe only solves the heat conduction problem, The heat dissipation function cannot be effectively achieved.
The LED heat sink of the festival decorative lamp can be used to control the junction temperature of the semiconductor device so that it is lower than the junction temperature. Most LED heat sinks are made of materials with high thermal conductivity. At present, the LED radiators in China and abroad are generally made of copper, aluminum and iron. And aluminum (thermal conductivity 2.12w / cm ·℃) is used more. Copper has a high thermal conductivity (3.85w / cm ·℃), but the cost of non aluminum is low. In some small electronic products, some will use steel radiators. Although the thermal conductivity of steel is poor (0.46w / cm ·℃), its cost is relatively low, so it can be used in products with low requirements. In most cases, the thicker the material of the LED radiator, the larger the surface area, and the better the heat dissipation effect. However, when the actual temperature of the semiconductor power device can be ensured to be lower than the large junction temperature, the LED heat sink with less bulk materials should be used as much as possible.
Heat pipe cooling technology of LED decorative lamp manufacturer: heat pipe uses heat pipe technology to transfer heat from LED chip to heat sink of shell. This is a common design for large lamps, such as festive decorative lamps.
Surface radiant heat treatment: the surface of the lampshade is treated with radiant heat: heat can be taken away from the surface of the lampshade by radiation only by applying radiant heat dissipation coating.