LED lamp and a heat sink thereof having a wound heat pipe

1. A heat sink including:

a heat-conducting base;

a heat-dissipating fin set comprising a plurality of heat-dissipating thin fin plates arranged radially at intervals for enclosing the heat-conducting base, a central hole and an accommodating space being formed inside the heat-dissipating fin set, the heat-conducting base being received in the central hole with its peripheral brought into thermal contact with first inner portions of the heat-dissipating thin fin plates, at least one annular groove in communication with the accommodating space being formed on second inner portions of the heat-dissipating thin fin plates; and

at least one wound heat pipe comprising an evaporating section at one distal end brought into thermal contact with the heat-conducting base, and a condensing section at the other distal end received in the annular groove and brought into thermal contact with the heat-dissipating thin fin plates.

2. The heat sink according to claim 1 , wherein an outer edge of each of the heat-dissipating thin fin plates is formed with a plurality of embossments to increase heat-dissipating areas and protecting a user from getting hurt by sharp edges of the heat-dissipating thin fin plates.

3. The heat sink according to claim 1 , wherein the heat-conducting base is provided with an insertion slot in communication with the accommodating space for allowing the evaporating section to be received therein.

4. The heat sink according to claim 1 , wherein there are two annular grooves formed on the second inner portions of the heat-dissipating thin fin plates, and there are two wound heat pipes in same winding direction respectively received in the two annular grooves and brought into thermal contact with the heat-dissipating thin fin plates.

5. The heat sink according to claim 1 , wherein there are two annular grooves formed on the second inner portions of the heat-dissipating thin fin plates, and there are two wound heat pipes in different winding direction respectively received in the two annular grooves and brought into thermal contact with the heat-dissipating thin fin plates.

6. The heat sink according to claim 1 , further including a heat-conducting medium applied between the evaporating section and the heat-conducting base as well as the condensing section and the heat-dissipating thin fin plates.

7. The heat sink according to claim 3 , wherein the evaporating section is in flush with the heat-conducting base.

8. A LED lamp, including:

a heat sink, comprising:

a heat-conducting base;

a heat-dissipating fin set comprising a plurality of heat-dissipating thin fin plates arranged radially at intervals for enclosing the heat-conducting base, a central hole and an accommodating space being formed inside the heat-dissipating fin set, the heat-conducting base being received in the central hole with its peripheral brought into thermal contact with first inner portions of the heat-dissipating thin fin plates, at least one being formed on second inner portions of the heat-dissipating thin fin plates; and

at least one wound heat pipe comprising an evaporating section at one distal end brought into thermal contact with the heat-conducting base, and a condensing section at the other distal end received in the annular groove and brought into thermal contact with the heat-dissipating thin fin plates;

a LED module disposed in the accommodating space to abut against one side of the heat-conducting base and the evaporating section; and

a lamp base provided on the other side of the heat-conducting base and electrically connected to the LED module.

9. The LED lamp according to claim 8 , wherein the heat-dissipating base is provided with a connecting trough for allowing the lamp base to be engaged therein.

10. The LED lamp according to claim 8 , wherein the heat-conducting base is provided with an insertion slot in communication with the accommodating space for allowing the evaporating section to be received therein.

11. The LED lamp according to claim 8 , wherein an outer surface of each of the heat-dissipating thin fin plates is provided with a plurality of embossments to increase heat-dissipating areas and protecting a user from getting hurt by sharp edges of the heat-dissipating thin fin plates.

12. The LED lamp according to claim 8 , wherein there are two annular grooves formed on the second inner portions of the heat-dissipating thin fin plates, and there are two wound heat pipes in same winding direction respectively received in the two annular grooves and brought into thermal contact with the heat-dissipating thin fin plates.

13. The LED lamp according to claim 8 , wherein there are two annular grooves formed on the second inner portions of the heat-dissipating thin fin plates, and there are two wound heat pipes in different winding direction respectively received in the two annular grooves and brought into thermal contact with the heat-dissipating thin fin plates.

14. The LED lamp according to claim 8 , wherein the LED module comprises a circuit board abutting against one surface of the heat-conducting base and the evaporating section, and a plurality of LEDs electrically connected to the circuit board.

15. The LED lamp according to claim 8 , further including a lens disposed in the accommodating space to cover the LED module.

16. The LED lamp according to claim 8 , further including a reflecting shroud disposed in the accommodating space and surrounded by the wound heat pipe.

17. The LED lamp according to claim 8 , further including a heat-conducting medium applied between the evaporating section and the heat-conducting base as well as the condensing section and the heat-dissipating thin fin plates.

18. The LED lamp according to claim 10 , wherein the evaporating section is in flush with the heat-conducting base.