Apparatus having forced fluid cooling and pin-fin heat sink

• US 6,817,405 B2
• Filed: 06/03/2002
• Issued: 11/16/2004
• Est. Priority Date: 06/03/2002
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kamath, Vinod, Matteson, Jason Aaron, Loebach, Beth Frayne, Mansuria, Mohanlal S.
• Primary Examiner(s): Bennett, Henry
• Assistant Examiner(s): PATEL, NIHIR B
• Application Number:
  US10/064,000
• Publication Number:
  US 20030221814A1
• Time in Patent Office: 897 Days
• Field of Search: 165/80.2, 165/80.3, 165/185, 165/908, 174/16.3, 257/706, 257/707, 257/712, 257/713, 257/721, 257/722, 361/689, 361/690, 361/692, 361/693, 361/704, 361/707, 361/718, 361/719, 361/722
• US Class Current: 165/80.3
• CPC Class Codes: F28F 3/022 the means being wires or pins
• CPC Class Codes: H01L 23/3677 Wire-like or pin-like cooling fins or heat sinks
• CPC Class Codes: H01L 23/467 by flowing gases, e.g. air H01L23/473 takes precedence
• 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
• CPC Class Codes: Y10S 165/908 Fluid jets

Abstract

A heat sink has a base plate and attached pin-fins with intake and discharge openings connected by a tubular channel. A pump moves cooling fluid across the exterior surface of the pin-fins, as well as the interior surface of the tubular channels, thereby increasing the surface area exposed to the cooling fluid. In one embodiment, the cooling fluid moves parallel to the base plate, and the discharge openings are oriented to discharge fluid in the same direction as the pump output, +/−90 degrees. Baffles may be added to duct the cooling fluid over the heat sink. In another embodiment, the cooling fluid moves perpendicular to the base plate and the discharge openings are oriented to vent the cooling fluid along lines that extend outward from a center point of the base plate, or along radial lines drawn from a central point through the pin-fins.

Claims

1. An apparatus, comprising:

a heat generating component;

a heat conducting base plate thermally coupled to said heat generating component;

a plurality of heat conducting pin-fins, each of said pin-fins having a free end and an attachment end, the attachment end of each of said pin-fins being attached to said base plate, each of said pin-fins having an intake opening wherein the intake opening is oriented to admit cooling fluid moving in a first direction substantially parallel to said base plate, each of said pin-fins having a discharge opening for discharging cooling fluid, each of said pin-fins having a tubular channel extending from the intake opening to the discharge opening, wherein the discharge opening of each said pin-fins is oriented to discharge cooling fluid in the first direction, +/−

90 degrees; and

a pump system for moving cooling fluid in the first direction substantially parallel to said base plate such that cooling fluid moves over the exterior surface and through the tubular channel of each of said pin-fins.

2. The apparatus of claim 1, further comprising a baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate for ducting cooling fluid between said base plate and said baffle.

3. The apparatus of claim 1, further comprising a ducting system comprising:

a first baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate; and

a second and third baffles positioned substantially parallel to the first direction and substantially perpendicular to said first baffle;

wherein cooling fluid from said pump system is ducted between said first, second and third baffles and discharged from said ducting system in substantially the first direction.

4. The apparatus of claim 1, further comprising a baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate for ducting cooling fluid between said base plate and said baffle.

5. The apparatus of claim 1, further comprising a ducting system comprising:

a first baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate; and

a second and third baffles positioned substantially parallel to the first direction and substantially perpendicular to said first baffle;

wherein cooling fluid from said pump system is ducted between said first, second and third baffles and discharged from said ducting system in substantially the first direction.

6. A heat sink, comprising:

a heat conducting base plate;

a plurality of heat conducting pin-fins, each of said pin-fins having a free end and an attachment end, the attachment end of each of said pin-fins being attached to said base plate, each of said pin-fins having an intake opening wherein the intake opening is oriented to admit cooling fluid moving in a first direction substantially parallel to said base plate, each of said pin-fins having a discharge opening for discharging cooling fluid, each of said pin-fins having a tubular channel extending from the intake opening to the discharge opening, wherein the discharge opening of each of said pin-fins is oriented to discharge cooling fluid in the first direction, +/−

90 degrees.

7. The heat sink of claim 6, further comprising a baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate for ducting cooling fluid between said base plate and said baffle.

8. The heat sink of claim 6, further comprising a ducting system comprising:

a first baffle adjacent the free end of each of said pin-fins and substantially parallel to said base plate; and

a second and third baffles positioned substantially parallel to the first direction and substantially perpendicular to said first baffle;

wherein cooling fluid is ducted between said first, second and third baffles and discharged from said heat sink in substantially the first direction.