Plate-type pulsating heat pipe used in large power LED heat radiation

Abstract

The invention discloses a plate-type pulsating heat pipe used in large power LED heat radiation, comprising a cover plate, a substrate, a capillary beam, a liquid plug, a cavity, a capillary beam lower bend set, a capillary beam upper bend set, a liquid feeding port and a LED chip installation screw hole. The capillary beam, the cavity communicated with the capillary beam bottom and the liquid feeding port positioned on the upper portion of the capillary beam and communicated with the capillary beam are milled on the substrate. A cross section of the capillary is a rectangular cross section or a triangular cross section. Two ends of each capillary beam are respectively independently connected with the cavity, and the connection positions are unsymmetric. The substrate and the cover plate are connected through vacuum brazing. The liquid feeding port is arranged with a valve and forms a sealed space that can form a vacuum environment. The installation screw hole is in external connection with the LED chip, and the cavity is equipped with a capillary core or a micro-channel structure. The heat pipe has the characteristics of stable work, high heat transferring efficiency, high heat transferring limit, and low temperature fluctuation in an evaporation zone.

Description

technical field [0001] The invention relates to a plate-type pulsating heat pipe used for heat dissipation of high-power LEDs and related electronic devices, belonging to the field of electronic device cooling and high-efficiency heat transfer. Background technique [0002] High-power LED (Light Emitting Diode) generally refers to the chip heat flux density greater than 1W / mm 2 Solid State Lighting (SSL) is generally considered to be the fourth generation of lighting after incandescent lamps, fluorescent lamps and high-pressure discharge lamps. Compared with the previous three generations of lighting equipment widely used by humans, it has the advantages of energy saving, environmental protection and long life. Based on incandescent lamps, LED light sources only need 10%-30% of their electric energy at the same lighting brightness, and their lifespan is dozens of times longer. In addition, the advantages of LED light source also include: fast switch response, high impact r...

AI Technical Summary

Problems solved by technology

[0005] Due to its working characteristics, the working cycle of the traditional pulsating heat pipe is not easy to be stable, and the evaporation section is prone to dry out, and the cycle is intermittent, resulting in local temperature rise, and the temperature of the evaporation section of the heat pipe is unstable and fluctuating.

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