Heat dissipation device

A heat dissipation device comprising:

• a base;
• a first fin unit and a second fin unit, the first fin unit located on the base, the second fin unit located on the first fin unit, each of the first and second fin units comprising a plurality of parallel fins with a plurality of channels defined therebetween, each fin comprising an inlet section, an outlet section and a neck section interconnecting the inlet and outlet sections, a height of the inlet section being larger than that of the outlet section, a height of the neck section reducing gradually from the inlet section to the outlet section;
• two heat pipes each comprising an evaporating portion connecting with the base, and a condensing portion inserting into a corresponding one of the outlet sections of the first and second fin units;
• and
• a fan located above the base and mounted to the inlet sections of the first and second fin units.

A heat dissipation device comprising:

• a base;
• at least one fin unit arranged on the base and comprising a plurality of fins perpendicular to the base, with a plurality of channels defined therebetween, each fin comprising an inlet section, an outlet section, a neck section interconnecting the inlet and outlet sections, and a bent section extending downwardly from a free end of the outlet section, a height of the neck section reducing gradually from the inlet section to the outlet section;
• at least one heat pipe comprising an evaporating portion connecting with the base and a condensing portion inserting into the outlet sections of the fins;
• and
• a fan located on the base and mounted onto the inlet sections of the fins, cooling air generated by the fan flowing into the channels of the at least one fin unit via the inlet sections of the fins, speeding up at the neck sections, and consequently accelerating to flow out from the channels via the outlet sections and the bent sections of the fins.