Loop type heat pipe

A loop type heat pipe comprising:

• an evaporator that is configured to evaporate a working fluid;
• a condenser that is configured to condense the evaporated working fluid;
• a vapor pipe that is provided between the evaporator and the condenser, and through which the evaporated working fluid flows;
• and
• a liquid pipe that is provided between the evaporator and the condenser, and through which the liquid-phase working fluid flows;
• wherein the vapor pipe comprises:
• 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;
• a pipe conduit that is formed by the lower-side metal layer, the intermediate metal layer and the upper-side metal layer;
• and
• a support column that is provided inside the pipe conduit and is connected to the lower-side metal layer and the upper-side metal layer,
• wherein:
• the support column divides the pipe conduit into a first flow path and a second flow path;
• a first opening defined in the support column communicates the first flow path with the second flow path;
• the intermediate metal layer comprises a plurality of intermediate metal layers;
• the support column comprises a plurality of support column portions that are stacked on one another;
• each of the support column portions comprises a lower surface where concave portions are formed along an extension direction of the pipe conduit, and an upper surface that is opposite to the lower surface;
• the first opening comprises a plurality of first opening portions;
• each of the first opening portions is formed by an upper surface of a first support column portion of the support column portions and a corresponding one of the concave portions of a second support column portion adjacent to the first support column portion;
• and
• bonding strength between the upper surface of the first support column portion and a lower surface of the second support column portion is smaller than bonding strength between adjacent ones of the intermediate metal layers.