Heat sink, assembly, and method of making

• US 7,106,589 B2
• Filed: 05/17/2004
• Issued: 09/12/2006
• Est. Priority Date: 12/23/2003
• Status: Expired due to Fees

• Current Assignee: AALL Power Heatsinks Incorporated
• Original Assignee: AALL Power Heatsinks Incorporated
• Inventors: Kiley, Richard F., Bush, Simone
• Primary Examiner(s): Datskovskiy, Michael
• Application Number:
  US10/847,535
• Publication Number:
  US 20050135062A1
• Time in Patent Office: 848 Days
• Field of Search: 361694-699, 361701-705, 361706-712, 361717-719, 361/722, 361/727, 174/15.2, 174/16.3, 257706-727, 165/80.3, 165/80.4, 165/104.21, 165/104.14, 165/104.33, 165/121, 165/122, 165/185, 298/900.3
• US Class Current: 361/700
• CPC Class Codes: F28D 15/0266 with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers F28D15/043 takes 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 1/24 and extending transversely F28F1/38 takes precedence
• CPC Class Codes: F28F 3/06 the means being attachable to the element
• 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 sink, method of making a heat sink, and a heat sink assembly. The heat sink includes a base and a plurality of heat pipes that extend from the base. The base is dimensioned and shaped to promote good thermal contact with the heat source, and the heat pipes are attached thereto in such a manner as to promote good thermal contact to the working fluid. Each heat pipe includes an outer surface and an inner surface that form a condenser portion from which from heat is transferred during condensation of the working fluid.

Claims

1. A heat sink for dissipating heat from a heat source, said heat sink comprising:

a heat-conductive base plate;

a plurality of heat pipes attached to and extending from said heat-conductive base plate;

wherein each of said plurality of heat pipes comprises an inner surface, and outer surface and a working fluid disposed in contact with said inner surface;

wherein said plurality of heat pipes are attached to said heat-conductive base plate in such a manner as to promote good thermal contact to a working fluid disposed within said plurality of heat pipes;

wherein each of said plurality of heat pipes is a closed system comprising said working fluid and an evaporator portion in contact with said heat-conductive base; and

wherein said plurality of heat pipes are of a number, and are spaced apart, such that each of said plurality of heat pipes convects heat from a substantial portion of the outer surface thereof; and

means for increasing a contact area between said evaporator portion of at least one of said plurality of heat pipes and said base plate without increasing a thickness of said entire base plate.

2. The heat sink as claimed in claim 1 wherein at least one of said plurality of heat pipes is substantially U-shaped, wherein a bottom portion of said U-shaped heat pipe is attached to said heat-conductive base and forms said evaporator portion, and wherein two top portions of said U-shaped heat pipe form two condenser portions.

3. The heat sink as claimed in claim 1 wherein said means for increasing the contact area between said evaporator portion of at least one of said plurality of heat pipes and said base plate further comprises at least one conductor block attached to, and forming a part of, said base plate;

and wherein at least one of said plurality of heat pipes is attached to and extends from said conductor block.

4. The heat sink as claimed in claim 3 wherein said base plate comprises a plurality of grooves in one grooved surface thereof and wherein said conductor block is adapted to attach said grooved surface.

5. The heat sink as claimed in claim 3 wherein said conductor block is a cylindrical in shape in comprises a plurality of threads, and wherein said base plate comprises at least one threaded opening therein dimensioned to mate with said plurality of threads of said conductor block.

6. The heat sink as claimed in claim 1 wherein at least one of said plurality of heat pipes comprises a plurality of flat fins that extend from said outer surface of each of said plurality of heat pipes.

7. A heat sink assembly comprising:

a heat sink comprising;

a heat-conductive base plate;

a plurality of heat pipes attached to and extending from said heat-conductive base plate;

wherein each of said plurality of heat pipes comprises an inner surface, an outer surface and a working fluid disposed in contact with said inner surface;

wherein said plurality of heat pipes are attached to said heat-conductive base plate in such a manner as to promote good thermal contact to a working fluid disposed within said plurality of heat pipes;

wherein each of said plurality of heat pipes is a closed system comprising said working fluid and an evaporator portion in contact with said heat-conductive base; and

wherein said plurality of heat pipes are of a number, and are spaced apart, such that each of said plurality of heat pipes convects heat from a substantial portion of its outer surface;

means for increasing a contact area between said evaporator portion of at least one of said plurality of heat pipes and said base plate without increasing a thickness of said entire base plate; and

means for forcing air over said heat pipes.

8. The heat sink assembly as claimed in claim 7 wherein at least one of said plurality of heat pipes of said heat sink is substantially U-shaped, wherein a bottom portion of said U-shaped heat pipe is attached to said heat-conductive base and forms said evaporator portion, and wherein two top portions of said U-shaped heat pipe form two condenser portions.

9. The heat sink assembly as claimed in claim 7 further comprising a plurality of convective surfaces extending from said heat-conductive base, wherein said convective surfaces comprise at least one of metal fins and metal pins.

10. The heat sink assembly as claimed in claim 9 wherein said heat-conductive base plate comprise a top surface and a bottom surface, wherein said assembly further comprises at least one heat generating device attached to said bottom surface of said heat-conductive base plate, and wherein said plurality of heat pipes extend from said top surface of said heat-conductive base plate in a location that is substantially perpendicular to a location of said heat generating device attached to said bottom surface.

11. The heat sink assembly as claimed in claim 7 wherein at least one of said plurality of heat pipes of said heat sink comprises a plurality of flat fins that extend from said outer surface of each of said plurality of heat pipes.

12. The heat sink assembly as claimed in claim 7 wherein said means for increasing said contact area between said evaporator portion of at least one of said plurality of heat pipes and said base plate further comprises at least one conductor block attached to, and forming a part of, said base plate;

and wherein at least one of said plurality of heat pipes is attached to and extends from said conductor block.

13. The heat sink assembly as claimed in claim 12 wherein said base plate comprises a plurality of grooves in one grooved surface thereof and wherein said conductor block is adapted to attach said grooved surface.

14. The heat sink assembly as claimed in claim 12 wherein said conductor block is a cylindrical in shape in comprises a plurality of threads, and wherein said base plate comprises at least one threaded opening therein dimensioned to mate with said plurality of threads of said conductor block.