Heat pipe and manufacture thereof

Abstract

Abstract PURPOSE:To make the external appearance of the heat pipe excellent and to improve its reliability by a method wherein an aluminum alloy pipe whose outer periphery is covered with a metal other than aluminum is used as a tip pipe such that an operating liquid is sealed into the pipe and after the metal covered section is welded by a resistance welding method, while the tip pipe is cut in a sealed condition. CONSTITUTION:The heat pipe consists of an aluminum alloy vessel 1 applied with a wick in the axial direction, an aluminum alloy cap 2, the tip pipe 3 and a stainless sleeve 4. Further, the tip pipe 3 is attached with a valve 5 and is fixed to an operating liquid sealing device 7 through a pipe 6. The operating liquid is sealed into the tip pipe 3 after a predetermined degree of vacuum is obtained by opening the valve 5 and then the valve 5 is closed. After that, the sleeve fitted about the tip pipe 3 is pressed by a press and welded airtight to the pipe by a resistance-welding method and finally, the resistance-welded section is cut at a position inbetween the center of that section and the valve 5 so that is cut in a favorable sealed condition without spoiling the airtightness of the tip pipe.

Inventors

• 👤 Setsuo Nakanishi
• 👤 中西　節雄
• 👤 Michihiro Haga
• 👤 羽賀　満弘

Bibliographic Details