High power LEDâ€™s advantage is energy saving and environmental , long service life, especially the rapid development for high power LED in recent years, , it is a concrete manifestation for this advantage. But the heat dissipation problem for high power LED still restrict the development for high power LED. So changing the heat dissipation for high power LED and sending out LED heat as far as possible are more and more important to the development for high power LED.
Heat pipe consists of a pipe shell, heat absorption core, as well as the heat transfer working medium. The core is firmly attached to the inner wall of the pipe shell, and penetrated by medium,too. Its working principle is: the high power LED heat goes through the heat pipe wall of the evaporation section and then make liquid work medium â€˜s temperature rise, in which filled liquid refrigerant temperature ; up to a certain temperature, water surface evaporates until it reaches the saturated vapor pressure, the heat in the latent heat way transfers to the steam, saturated steam pressure increases with the rising temperature of the liquid. Under the function of the pressure difference,Steam accomplishes the condensation and delivers the latent heat in the gas-liquid interface of the condensation section when steam flows to the condensing section where the pressure and temperature are both lower. The heat released from the gas-liquid interface conducts through the wick and tube wall and then is transferred to the outside of the tube.