The invention provides an
air cooling and liquid cooling dual-purpose heat radiator, which consists of a bottom plate, a
heat pipe, a liquid cooling plate, a liquid cooling upper cover, a heat
radiation fin and a fan, wherein the
heat pipe is bent and folded into a U shape, the horizontal part of the middle section of the
heat pipe is welded in a hole commonly preserved by the bottom plate and the liquid cooling plate, and the vertical parts at the two sides of the heat
pipe are welded with the heat
radiation fin. The bottom plate is in contact with a heat source. During the
air cooling, the fan is started, and the heat is transmitted into the
atmosphere through the bottom plate along the heat
pipe from the heat
radiation fin. During the liquid cooling switching, the fan is switched, the cooling liquid is introduced into the liquid cooling upper cover, the heat is transmitted ot the liquid cooling plate through the bottom plate and the heat
pipe, and the heat is brought away by cooling liquid flowing through the liquid cooling plate. The
air cooling and liquid cooling dual-purpose heat radiator has the advantages that the two heat radiation
modes including the air cooling mode and the liquid cooling mode can be conveniently switched according to the concrete use requirements, the switching process is simple, the operation is convenient, the part dismounting is not needed, in addition, both the air cooling heat radiation efficiency and the liquid cooling heat radiation efficiency can be ensured, and the air cooling and liquid cooling dual-purpose heat radiator is suitable for being used as a
heat sink for a thermoelectric refrigerating unit.