US Patent 10976111 Loop type heat pipe

A loop type heat pipe includes: an evaporator configured to vaporize a liquid working fluid; a condenser configured to condense the vaporized working fluid into the liquid working fluid; a vapor pipe provided between the evaporator and the condenser; and a liquid pipe provided between the evaporator and the condenser. Each of the vapor pipe and the liquid pipe includes: a lower-side metal layer; an intermediate metal layer that is disposed on the lower-side metal layer; an upper-side metal layer that is disposed on the intermediate metal layer; and a conduit that is formed by the lower-side metal layer, the intermediate metal layer, and the upper-side metal layer, and at least one of the upper-side metal layer and the lower-side metal layer warps outward in a first portion of the vapor pipe.