Method of producing heat pipe
AssigneeHitachi, Ltd.
InventorsMichio Yanadori, Toshiaki Kawabata
Life of this patent
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Abstract
A heat pipe is provided with a multiplicity of longitudinal deep grooves and ridges formed in the inner peripheral surface thereof. A plurality of shallow grooves are formed by a plastic work in the top surfaces of the longitudinal ridges separating the deep grooves. Parts of burrs formed as a result of the plastic work for forming the shallow grooves are extended over the deep groove so as to form bridges connecting adjacent ridges over the deep grooves.
Claims5
A method of producing a heat pipe comprised of a closed vessel filled with a liquid adapted for evaporation and condensation in said closed vessel, said closed vessel having an inner surface which is provided with a multiplicity of longitudinal deep grooves which move the liquid by capillary action thereby to convey heat from one to the other end of said closed vessel, said method comprising:
- drawing a rotating drawing tool through the pipe provided with the deep grooves to form, by plastically working, a plurality of shallow grooves in the top surfaces of ridges separating said deep grooves so as to intersect said deep grooves, and to form a plurality of spaced bridges connecting adjacent ridges by burrs which are produced during the formation of the shallow grooves on the top surfaces of the ridges, thereby to enhance the capillary effect produced by said deep grooves.
Dependencies are inferred from the claim text.