Multiple flow entrance heat sink

• US 10,692,798 B2
• Filed: 04/09/2015
• Issued: 06/23/2020
• Est. Priority Date: 04/10/2014
• Status: Active Grant

• Current Assignee: Advanced Thermal Solutions, Inc.
• Original Assignee: Advanced Thermal Solutions, Inc.
• Inventors: Azar, Kaveh, Tavassoli-Hojati, Bahman
• Primary Examiner(s): Atkisson, Jianying C
• Assistant Examiner(s): Diaz, Miguel A
• Application Number:
  US14/682,727
• Publication Number:
  US 20150296662A1
• Time in Patent Office: 1,902 Days
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 2215/04 Assemblies of fins having different features, e.g. with different fin densities
• CPC Class Codes: F28F 3/02 Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations F28F3/08 takes precedence
• CPC Class Codes: F28F 3/06 the means being attachable to the element
• CPC Class Codes: H01L 21/4871 Bases, plates or heatsinks
• CPC Class Codes: H01L 21/4882 Assembly of heatsink parts
• CPC Class Codes: H01L 23/3672 Foil-like cooling fins or heat sinks being part of lead-frames H01L23/49568
• 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: H05K 7/20 Modifications to facilitate cooling, ventilating, or heating

Abstract

Embodiments of the invention related to using the fin length of the heat sink extending from an entrance of the heat sink to an interior sectional wall as the heat transfer element to achieve high thermal performance. The sectional wall(s) of the heat sink function to isolate fluid flow communication between the heat sink sections of fin fields, thereby preventing a flow coupling between the fin fields.

Claims

1. An apparatus comprising:

a base having a perimeter with a first base edge and an opposite second base edge;

a flow barrier extending from the base and comprising;

opposite first and second barrier sides facing and spaced from the first and second base edges, respectively, a barrier length parallel to the first and second barrier sides, a barrier height perpendicular to the barrier length and to the base, and a relatively uniform barrier thickness between the first and second barrier sides and perpendicular to the barrier length and the barrier height;

a first fin field positioned between the first base edge and the first barrier side, the first fin field comprising a plurality of first fins extending from the base and each having a respective first fin length extending parallel to the base and a respective first fin thickness that is perpendicular to the first fin length and less than the barrier thickness, the first fins collectively providing;

a first fin sub-section that is positioned distal to the flow barrier, the first fin sub-section having a first fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is substantially equal to the barrier height; and

a second fin sub-section that is proximate to the flow barrier, the second fin sub-section having a second fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is less than the first fin sub-section height and the barrier height; and

a second fin field separated from the first fin field by the flow barrier and positioned between the second base edge and the second barrier side, the second fin field comprising a plurality of second fins extending from the base and each having a respective second fin length extending parallel to the base and a respective second fin thickness that is perpendicular to the second fin length and less than the barrier thickness,

wherein the flow barrier is configured and arranged to prevent a fluid flow mix across the first and second fin fields.

2. The apparatus of claim 1, wherein the first flow barrier is formed as an integral part of the base.

3. The apparatus of claim 1, wherein the flow barrier extends linearly across the base from a third base edge to an opposite fourth base edge.

4. The apparatus of claim 1, wherein the first fins extend in length perpendicular to the barrier length and have first ends proximate to and physically spaced from the flow barrier by a gap.

5. The apparatus of claim 1, wherein the flow barrier is centrally located between the first and second base edges.

6. The apparatus of claim 1, wherein the second fin sub-section of the first fins extends lengthwise along substantially an entirety of the barrier length.

7. The apparatus of claim 1, wherein the first fin field further comprises an external fin extending from the base and having a length parallel to the first fins, the external fin having a constant height over an entirety of the length of the external fin, the constant height of the external fin being substantially equal to the first fin sub-section height.

8. The apparatus of claim 1, further comprising a cover plate oppositely disposed with respect to the base, the cover plate comprising a vertical fin extending from the cover plate and having a length parallel to the first fins, the vertical fin having a constant height over an entirety of the length thereof, the constant height of the vertical fin being substantially equal to the first fin sub-section height.

9. The apparatus of claim 1, wherein the first fins extend in length perpendicular or oblique to the barrier length and have first ends proximate to and physically attached to the flow barrier.

10. The apparatus of claim 9, wherein the second fins extend in length perpendicular or oblique to the barrier length and have second ends proximate to and physically attached to the flow barrier.

11. An apparatus comprising:

a base having a perimeter with a first base edge and an opposite second base edge;

a flow barrier extending from the base and comprising opposite first and second barrier sides facing and spaced from the first and second base edges, respectively, a barrier length parallel to the first and second barrier sides, a barrier height perpendicular to the barrier length and to the base, and a relatively uniform barrier thickness between the first and second barrier sides and perpendicular to the barrier length and the barrier height;

a first fin field positioned between the first base edge and the first barrier side, the first fin field comprising a plurality of first fins extending from the base and each having a respective first fin length extending parallel to the base and a respective first fin thickness that is perpendicular to the first fin length and less than the barrier thickness, the first fins collectively providing

a first fin sub-section that is positioned distal to the flow barrier, the first fin sub-section having a first fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is substantially equal to the barrier height; and

a second fin sub-section that is proximate to the flow barrier, the second fin sub-section having a second fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is less than the first fin sub-section height and the barrier height; and

a second fin field separated from the first fin field by the flow barrier and positioned between the second base edge and the second barrier side, the second fin field comprising a plurality of second fins extending from the base and each having a respective second fin length extending parallel to the base and a respective second fin thickness that is perpendicular to the second fin length and less than the barrier thickness, the second fins collectively providing

a third fin sub-section that is positioned distal to the flow barrier, the third fin sub-section having a third fin sub-section height that is perpendicular to the second fin length and the second fin thickness and that is substantially equal to the barrier height; and

a fourth fin sub-section that is proximate to the flow barrier, the fourth fin sub-section having a fourth fin sub-section height that is perpendicular to the second fin length and the second fin thickness and that is less than the third fin sub-section height and the barrier height

wherein the flow barrier is configured and arranged to prevent a fluid flow mix across the first and second fin fields.

12. The apparatus of claim 11, wherein the first fins extend in length perpendicular or oblique to the barrier length.

13. An apparatus comprising:

a base having a perimeter with opposite first and second base edges and opposite third and fourth base edges; and

a first flow barrier extending from the base and comprising opposite first and second barrier sides facing and spaced from the first and second base edges, respectively, a first barrier length parallel to the first and second barrier sides, a first barrier height perpendicular to the first barrier length and to the base, and a relatively uniform first barrier thickness between the first and second barrier sides and perpendicular to the first barrier length and the first barrier height;

a second flow barrier extending from the base and comprising opposite third and fourth barrier sides facing and spaced from the opposite third and fourth base edges, respectively, a second barrier length parallel to the third and fourth barrier sides, a second barrier height perpendicular to the second barrier length and to the base, and a relatively uniform second barrier thickness between the first and second barrier ends and perpendicular to the second barrier length and the second barrier height, the second flow barrier perpendicularly intersecting the first flow barrier;

a first fin field positioned between the first base edge and the first barrier side, the first fin field comprising a plurality of first fins extending from the base and each having a respective first fin length extending parallel to the base and a respective first fin thickness that is perpendicular to the first fin length and less than the first barrier thickness, the first fins collectively providing

a first fin sub-section that is positioned distal to the first flow barrier, the first fin sub-section having a first fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is substantially equal to the first barrier height; and

a second fin sub-section that is proximate to the first flow barrier, the second fin sub-section having a second fin sub-section height that is perpendicular to the first fin length and the first fin thickness and that is less than the first fin sub-section height and the first barrier height; and

a second fin field separated from the first fin field by the first flow barrier and positioned between the second base edge and the second barrier side, the second fin field comprising a plurality of second fins extending from the base and each having a respective second fin length extending parallel to the base and a respective second fin thickness that is perpendicular to the second fin length and less than the first barrier thickness,

wherein the first and second flow barriers are configured and arranged to prevent a fluid flow mix across the first and second fin fields.

14. The apparatus of claim 13, wherein the first and second flow barriers are formed as an integral part of the base.

15. The apparatus of claim 13, wherein the second fins collectively provide:

a third fin sub-section that is positioned distal to the second flow barrier, the third fin sub-section having a third fin sub-section height that is perpendicular to the second fin length and the second fin thickness and that is substantially equal to the barrier height; and

a fourth fin sub-section that is proximate to the second flow barrier, the fourth fin sub-section having a fourth fin sub-section height that is perpendicular to the second fin length and the second fin thickness and that is less than the third fin sub-section height and the second barrier height.

16. The apparatus of claim 13, wherein:

the first fins extend in length perpendicular or oblique to the first barrier length and have first ends proximate to and physically attached to the first flow barrier; and

the second fins extend in length perpendicular to the second barrier length and have second ends proximate to and physically attached to the second flow barrier.

17. The apparatus of claim 13, wherein the first fins extend in length perpendicular to the first barrier length and have first ends proximate to and physically spaced from the first flow barrier by a gap.

18. The apparatus of claim 13, wherein the first flow barrier is centrally located between the first and second base edges.

19. The apparatus of claim 13, wherein the first fin field further comprises an external fin extending from the base and having a length parallel to the first fins, the external fin having a constant height over an entirety of the length of the external fin, the constant height of the external fin being substantially equal to the first fin sub-section height.

20. The apparatus of claim 13, further comprising a cover plate oppositely disposed with respect to the base, the cover plate comprising a vertical fin extending from the cover plate and having a length parallel to the first fins, the vertical fin having a constant height over an entirety of the length thereof, the constant height of the vertical fin being substantially equal to the first fin sub-section height.