Model design UV-LED printing lamp uses the principle of light curing to dry the ink through photochemical reaction. The higher the UV light output density, the more the curing depth and speed, and the better the printing effect. In the case of a small substrate size, 120 chips are packaged, and such a high-density arrangement causes a rapid increase in heat flux per unit area. If the effective heat dissipation measures are not taken, the junction temperature of the chip will rise rapidly. Seriously affect its performance and longevity. The traditional natural convection adopts a single heat dissipation method, which has a simple structure, low cost and high reliability. It is suitable for a heat dissipation system with little power, but its thermal resistance is too large, and the heat generated by the distribution of the UV-LED array is easily concentrated locally. The generation of "hot spots" causes the junction temperature of the chip to rise, making it difficult to meet the heat dissipation requirements. Therefore, more and more high-power UV-LED printing lamp cooling systems use forced convection cooling methods, such as air-cooling fins, to achieve better heat dissipation.
The heat pipe is a highly efficient heat conducting device with good heat transfer and isothermal performance, which makes full use of the evaporation and condensation of the liquid to transfer heat. The principle of heat transfer and the rapid heat transfer properties of the refrigerant make the heat pipe have an extremely high thermal conductivity, and its thermal conductivity far exceeds any known metal. Therefore, the heat pipe heat dissipation method is applied to the high-power UV-LED printing lamp heat dissipation system, which can effectively reduce the heat resistance of the heat transfer process, eliminate the "hot spot", reduce the junction temperature of the chip, and keep the temperature of the heat dissipation surface uniform. Therefore, this paper is aimed at high-power UV. -The design requirements of the LED printing lamp cooling system, based on the traditional air-cooled fins, combined with the actual application, design the heat dissipation scheme of the heat pipe and the air-cooled fins. The heat dissipation system is installed in a rectangular casing, the fins are made of copper, and the two axial flow fan light sources are introduced to the opposite side, and the air outlets are arranged on the four sides of the outer casing near the light source surface, and the heat pipes are arranged at equal intervals along the long sides of the substrate. Two groups, one end of which is welded to the copper plate, and the other end is made of copper fins at different heights.
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