Patent ID: 8919427

Claim:
A long-acting heat pipe, comprising: a metal tube having two sealed ends and a chamber formed in the metal tube; a partition element formed inside the metal tube to divide the chamber into a vapor channel and a liquid channel communicating with the vapor channel only at the two sealed ends by two connecting areas, respectively; a heat-absorption part corresponding to a portion of the metal tube to include respective portions of the vapor channel and the liquid channel; a capillary arranged only in the respective portions of the vapor channel and the liquid channel, wherein the respective portion of the vapor channel is partly filled with the capillary on a periphery of the respective portion of the vapor channel to form a hollow portion in the respective portion of the vapor channel, and the respective portion of the liquid channel is entirely filled with the capillary to form a structure for preventing vapor from flowing through the respective portion of the liquid channel; and working fluid filling the chamber.