LED illuminating device

• US 8,348,470 B2
• Filed: 10/19/2009
• Issued: 01/08/2013
• Est. Priority Date: 07/28/2009
• Status: Expired due to Fees

• Current Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Inventors: Liu, Tay-Jian, Zhou, Tao-Ping, Xiong, Ying
• Primary Examiner(s): Ton, Anabel
• Application Number:
  US12/581,171
• Publication Number:
  US 20110026251A1
• Time in Patent Office: 1,177 Days
• Field of Search: 362/294, 362/373, 362/249.02
• US Class Current: 362/294
• CPC Class Codes: F21V 23/008 the casing being outside the housing of the lighting device
• CPC Class Codes: F21V 29/51 using condensation or evaporation of a fluid, e.g. heat pipes
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/76 with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
• CPC Class Codes: F21V 29/763 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/777 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2107/00 Light sources with three-dimensionally disposed light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

An LED illuminating device includes a boiling room, an optical module, a heat insulating member and a heat exchanging member communicating with the boiling room. The boiling room defines a horizontal room and an annular, vertical room having a bottom end surrounding the horizontal room. A wick structure is received in the boiling room. Working fluid is received in the boiling room and saturated in a bottom portion of the wick structure. The optical module includes a plurality of LEDs attached to a heat absorbing member connecting with the bottom portion of the wick structure. The heat insulating member is received in the boiling room and attached to a middle portion of the wick structure for thermally insulating the middle portion of the wick structure from vaporized working fluid in the horizontal room of the boiling room.

Claims

1. An LED illuminating device, comprising:

a heat management room defined among an outer tube, an inner tube coaxially received in the outer tube, a heat absorbing member coupling to and sealing a bottom end of the outer tube, a base coupling to and sealing a bottom end of the inner tube, and a sealing plate arranged on top ends of the outer tube and the inner tube, the heat management room comprising a lower room being defined between the base and the heat absorbing member, and an upper room being defined between the inner tube and the outer tube, a bottom end of the upper room communicating with the lower room;

working fluid filled in the lower room of the heat management room;

a heat exchanging member comprising at least one heat exchanging pipe extending through the sealing plate into the upper room of the heat management room, an inner space of the at least one heat exchanging pipe communicating with the upper room of the heat management room and a plurality of heat exchanging fins arranged around the at least one heat exchanging pipe;

an optical module comprising a substrate attached to the heat absorbing member and a plurality of LEDs fixed on the substrate;

an electrical module being electrically connected with the LEDs; and

a heat insulating member being received in the heat management room and attached to the base to thermally insulate the base from vaporized working fluid in the lower room of the heat management room.

2. The LED illuminating device of claim 1, wherein the heat insulating member comprises an adiabatic plate attached to the base and a plurality of cylinders extending downwardly from the adiabatic plate towards the heat absorbing member.

3. The LED illuminating device of claim 2, further comprising a wick structure arranged in the heat management room, the wick structure comprising a bottom portion arranged between the heat absorbing member and the cylinders, a middle portion between the adiabatic plate and the base, and a plurality of connecting portions respectively extending through the cylinders to interconnect the bottom portion and the middle portion of the wick structure.

4. The LED illuminating device of claim 3, wherein the wick structure further comprises an inner portion spread on the inner tube with a bottom end thereof connected to an outer periphery of the middle portion, and an outer portion spread on the outer tube with a bottom end thereof connected to an outer periphery of the bottom portion, a plurality of inner fins extending inwardly from an inner surface of the inner tube, and a plurality of outer fins extending outwardly from an outer surface of the outer tube.

5. The LED illuminating device of claim 4, wherein the wick structure further comprises a top portion spread on the sealing plate and interconnecting top ends of the inner portion and the outer portion of the wick structure.

6. The LED illuminating device of claim 4, wherein a space is defined among the inner fins and receives the electric module therein, the electrical module comprising a casing and a circuit board received in the casing and electrically connected with the LEDs, a plurality of air passage holes being provided through a circumferential periphery of the casing, a plurality of connecting poles extending downwardly from the casing and fixed to the base to fix the electric module on the base.

7. The LED illuminating device of claim 1, further comprising a plurality of heat dissipating fins extending integrally and upwardly from the base.

8. The LED illuminating device of claim 1, wherein the at least one heat exchanging pipe is flat and elongated, the plurality of heat exchanging fins being formed on top and bottom sides of the at least one heat exchanging pipe, the heat exchanging fins at the bottom side of the at least one heat exchanging pipe being attached the base intimately.

9. The LED illuminating device of claim 8, wherein a plurality of flow channels are defined in the inner space of the at least one heat exchanging pipe and communicates with the upper room of the heat management room.

10. The LED illuminating device of claim 1, wherein the heat absorbing member, the base, the substrate each are V-shaped in cross section.

11. The LED illuminating device of claim 1, wherein the heat absorbing member, the base, the substrate each are planar, the bottom end of the inner tube being higher than the bottom end of the outer tube.

12. An LED illuminating device, comprising:

a heat management room defining a lower room and an annular, upper room surrounding the lower room;

a heat exchanging member comprising at least one heat exchanging pipe extending into a top of the heat management room to communicate with the upper room and a plurality of heat exchanging fins arranged around the at least one heat exchanging pipe;

a wick structure received in the heat management room;

working fluid received in the heat management room and saturated in a bottom portion of the wick structure located at a bottom of lower room;

an optical module being provided with a plurality of LEDs attached to a heat absorbing member connecting with the bottom portion of the wick structure; and

a heat insulating member being received in the heat management room and attached to a middle portion of the wick structure at a top of the lower room for thermally insulating the middle portion of the wick structure from vaporized working fluid in the lower room of the heat management room.

13. The LED illuminating device of claim 12, wherein the heat management room is defined among an outer tube, an inner tube coaxially received in the outer tube, a heat absorbing member coupling to and sealing a bottom end of the outer tube, a base coupling to and sealing a bottom end of the inner tube, and a sealing plate between a top end of the outer tube and a top end of the inner tube, the lower room being defined between the base and the heat absorbing member, the annular, upper room being defined between the inner tube and the outer tube surrounding the lower room, the middle portion of the wick structure being attached to a bottom of the base, the bottom portion of the wick structure being arranged on a top of the heat absorbing member, the at least one heat exchanging pipe extending through the sealing plate.

14. The LED illuminating device of claim 12, wherein the heat absorbing member, the base, the substrate each are V-shaped in cross section.

15. The LED illuminating device of claim 12, wherein the heat absorbing member, the base, the substrate each are planar, the bottom end of the inner tube being higher than the bottom end of the outer tube.

16. The LED illuminating device of claim 12, wherein the at least one heat exchanging pipe is arced and elongated, the heat exchanging fins being formed on top and bottom sides of the heat exchanging pipe, the heat exchanging fins at the bottom side of the at least one heat exchanging pipe being attached the base intimately.

17. The LED illuminating device of claim 16, wherein a plurality of flow channels is defined in the heat exchanging pipe and communicates with the upper room of the heat management room.

18. The LED illuminating device of claim 13, wherein the wick structure further comprises an inner portion spread on the inner tube with a bottom end thereof connected to an outer periphery of the middle portion, and an outer portion spread on the outer tube with a bottom end thereof connected to an outer periphery of the bottom portion, and a plurality of connecting portions interconnecting the bottom portion and the middle portion.

19. The LED illuminating device of claim 18, wherein the heat insulating member comprises an adiabatic plate attached to the middle portion of the wick structure and a plurality of cylinders extending downwardly from the adiabatic plate to the bottom portion of the wick structure, the connecting portions of the wick structure being respectively received in the cylinders of the heat insulating member.

20. The LED illuminating device of claim 18, further comprising a plurality of outer fins extending outwardly from an outer surface of the outer tube, and a plurality of inner fins extending inwardly from an inner surface of the inner tube.