Structure of a heat-pipe cooler

A heat-pipe cooler includes a housing having no air contained therein, working liquid contained in the housing, a sinter metal held in the housing, and hollow cooling fins formed on the housing and communicating with interior space of the housing. Thus, heat produced by a heat source will be transferred to the sinter metal, and then the working liquid, which has been absorbed by the sinter metal, is evaporated by the heat, and travels into the cooling fins. And, the evaporated working liquid is cooled, and changes into liquid form in the cooling fins, drops onto, and is absorbed by the sinter metal. And finally, the working liquid flows back to the evaporating section of the cooler along the sinter metal with the help of capillary force.