PURPOSE: To provide a rod-form loop type heat pipe which is constituted to separate a steam passage through which refrigerant steam is raised and a liquid return passage through which a refrigerant condensed at a condensation part is returned and causeds flow-down of all the condensed refrigerant through the liquid-return passage, and provide an excellent heat transmission efficiency.
CONSTITUTION: A vaporization part 5 is formed at the lower part of a vertical metallic pipe 3a having a lower end being closed and an upper end being opened and a condensation part 6 is formed at a metallic pipe 3b having two ends being closed and tilted. The opening upper part of the metallic pipe 3a at which the vaporization part 5 is arranged is protruded in the inner lower side of the metallic pipe 3b at which the condensation part 6 is arranged and the lower side of the tilting condensation part 3b forms a liquid reservoir 13. A liquid return part 9 through which the liquid reservoir part 13 and the vaporization part 5 are intercommunicated is located in the metallic pipe 3a at which the vaporization part 5 is arranged. The sectional area of the liquid return passage 9 is reduced to a value lower than that of the metallic pipe 3a at which the vaporization part 5 is arranged.
HIRAMA SHINYA
TOMITA YASUO
SATO HIROYUKI
KITASHIBA ELECTRIC