Heat dissipation device

• US 7,983,043 B2
• Filed: 07/24/2009
• Issued: 07/19/2011
• Est. Priority Date: 03/20/2009
• Status: Active Grant

• Current Assignee: Champ Tech Optical (FOSHAN) Corporation (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Foxconn Technology Co., Ltd., Fuzhun Precision Industry Company Limited (Foxconn Technology Co., Ltd.)
• Inventors: Xu, Shou-Biao, Zhou, Shi-Wen, Chen, Guo
• Primary Examiner(s): HOFFBERG, ROBERT JOSEPH
• Application Number:
  US12/508,582
• Publication Number:
  US 20100238630A1
• Time in Patent Office: 725 Days
• Field of Search: 36167946-69747, 361/700, 361703-704, 361709-710, 361718-719, 165 802- 803, 165/104.33, 165/185, 174/15.2, 174/16.1, 174/16.3
• US Class Current: 361/700
• CPC Class Codes: F28D 15/0233 the conduits having a particular shape, e.g. non-circular cross-section, annular F28D15/0241, F28D15/0266 take precedence
• CPC Class Codes: F28D 15/0275 Arrangements for coupling heat-pipes together or with other structures, e.g. with base blocks; Heat pipe cores
• CPC Class Codes: F28F 2215/10 Secondary fins, e.g. projections or recesses on main fins
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• 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

A heat dissipation device includes a heat sink and a pair of heat pipes fixed to the heat sink. The heat sink includes a rectangular post, four branches extending outwardly from four corners of the post, respectively, and a plurality of fins extending between the branches. Each heat pipe includes an evaporating section attached to a bottom of the post, a condensing section parallel to the evaporation section and attached to a top of the post, and an adiabatic section interconnecting the evaporating section and the condensing section. A block is secured to bottoms of the condensing sections of the heat pipes.

Claims

1. A heat dissipation device comprising:

a heat sink comprising a post, a plurality of branches and a plurality of fins, the plurality of branches and the plurality of fins extending outwardly from a side face of the post; and

a heat pipe fixed to the heat sink, the heat pipe comprising two parallel sections respectively extending into a top and a bottom of the post, and a connecting section interconnecting the two parallel sections,

wherein the post comprises four corners, and the plurality of branches comprises four branches, each of the four branches extend diagonally from a corner of the four corners of the post, and

wherein the plurality of fins comprises four fin groups, each of the four fin groups located between two adjacent branches of the four branches.

2. The heat dissipation device as claimed in claim 1, wherein each of a top and a bottom of the post defines a groove, a first of the two parallel sections of the heat pipe being received in the groove in the top of the post and a second of the two parallel sections of the heat pipe being received in the groove in the bottom of the post.

3. The heat dissipation device as claimed in claim 1, wherein the two parallel sections have different lengths.

4. The heat dissipation device as claimed in claim 1, wherein some fins of the four fin groups located at two opposite sides of the post are perpendicular to the two parallel sections of the heat pipe, and other fins of the four fin groups located at another two opposite sides of the post are parallel to the two parallel sections of the heat pipe.

5. The heat dissipation device as claimed in claim 1, wherein the post has a rectangular cross-section.

6. The heat dissipation device as claimed in claim 1, wherein a column of four columns is formed on the each of the four branches, wherein two of the four columns are located at distal ends of two of the four branches, and another two of the four columns are located adjacent to distal ends of another two of the four branches.

7. The heat dissipation device as claimed in claim 6, wherein a fastener extends in a bottom of each column of the four columns for fastening the heat sink to a printed circuit board so that the heat sink can have an intimate contact with an electronic component mounted on the printed circuit board.

8. The heat dissipation device as claimed in claim 1, wherein two forks are formed on two diagonally opposite ones of the four branches, one of the two forks is directly connected to one of the two diagonally opposite ones of the four branches, and another one of the two forks is connected to another one of the two diagonally opposite ones of the four branches via a plate.

9. The heat dissipation device as claimed in claim 1, wherein a block is attached to the bottom of the post via one of the two parallel sections of the heat pipe.

10. The heat dissipation device as claimed in claim 9, wherein an area of the block is substantially the same as that of a cross section of the post.

11. A heat dissipation device comprising:

a heat sink comprising a post, four branches and four fin groups, the four branches and the four fin groups extending outwardly from a side face of the post, each fin group of the four fin groups comprising a plurality of fins located between two adjacent branches of the four branches; and

a heat pipe comprising an evaporating section, a condensing section parallel to the evaporating section, and an adiabatic section interconnecting the condensing section and the evaporating section;

wherein the evaporating section and the condensing section of the heat pipe are fixed to a bottom face and a top face of the post, respectively, and the adiabatic section of the heat pipe is located in front of some of the plurality of fins of the four fin groups.

12. The heat dissipation device as claimed in claim 11, wherein the plurality of fins of one fin group of the four fin groups are perpendicular to those of an adjacent fin group of the four fin groups, and parallel to those of an opposite fin group of the four fin groups.

13. The heat dissipation device as claimed in claim 11, wherein the evaporation section of the heat pipe is perpendicular to the plurality of fins of one fin group of the four fin groups, and parallel to the plurality of fins of an adjacent fin group of the four fin groups.

14. The heat dissipation device as claimed in claim 11, wherein four columns are formed on the four branches, respectively, and two forks are formed on two diagonally opposite ones of the four branches, respectively.

15. The heat dissipation device as claimed in claim 11, wherein each of the top face and the bottom face of the post defines a groove therein, and the evaporating section being received in the groove in the bottom of the post and the condensing section of the heat pipe are received in the groove in the top of the post.

16. A heat dissipation device comprising:

a heat sink comprising a post, a plurality of branches and a plurality of fin groups, the post comprising a top face, a bottom face and a side face between the top face and the bottom face, the plurality of branches and the plurality of fin groups extending outwardly from the side face of the post, and the plurality of branches and the plurality of fin groups alternating with each other, each of the plurality of fin groups comprising a plurality of fins; and

a heat pipe fixed to the heat sink, the heat pipe comprising two parallel sections respectively attaching to the top face and the bottom face of the post, and a connecting section interconnecting the two parallel sections.

17. The heat dissipation device as claimed in claim 16, wherein the post has a rectangular cross-section, the rectangular cross-section forming four corners, the plurality of branches are four in number, and the plurality of fin groups are four in number, the plurality of branches respectively extending from the four corners of the post, and the each of the plurality of fin groups respectively extending from four different sides of the side face of the post.

18. The heat dissipation device as claimed in claim 17, wherein the plurality of fins of the each of the plurality of fin groups are parallel to each other, the plurality of fins of two of the plurality of fin groups at opposite sides of the post are perpendicular to the two parallel sections of the heat pipe, and the plurality of fins of another two of the plurality of fin groups located at another two opposite sides of the post are parallel to the two parallel sections of the heat pipe.

19. The heat dissipation device as claimed in claim 16, wherein the plurality of fins of one of the plurality of fin groups are perpendicular to the two parallel sections of the heat pipe, and the plurality of fins of another one of the plurality of the fin groups are parallel to the two parallel sections of the heat pipe.

20. The heat dissipation device as claimed in claim 16, wherein the plurality of fins of the each of the plurality of fin groups extend perpendicularly from a side of the side face of the post and are parallel to each other.