Importance

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Abstract

A heat pipe can be formed with a helical groove to allow easy bending, but the groove cannot be formed adequately deep. This allows the heat pipe to spring back during bending, thus making it difficult to use. A heat pipe transfers heat using a working liquid sealed under decompression in a sealed tube. Helical ribs are formed from: a deep groove 12a cut radially and disposed on the outer perimeter surface of sealed pipe 10; and a thin groove 12b formed on the inner perimeter surface to generate capillary action. Deep groove 12 allows easy bending and ensures that deformation is maintained, while thin groove 12b provides capillary action to allow circulation of the working liquid in sealed pipe 10. To make the heat pipe, a shaft-shaped metal core 8 is formed with helical ribs 9 at a prescribed axial pitch on the perimeter surface. An outer cylinder 10a, which will form sealed tube 10, is fitted to the outside of shaft-shaped metal core 8. Sealed pipe 10 is made by rolling the perimeter surface of outer cylinder 10a along the cavities of metal core 8 to form helical ribs 12, including deep groove 12a and thin groove 12b, on outer cylinder 10a. The high-temperature section of the heat-radiating structure is thermally connected to a cooling fan via sealed pipe 10.

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First Claim