Compliant pin fin heat sink and methods
View Patent ↗A heat sink includes a plurality of layers being disposed substantially parallel with a surface of a heat source. The layers include a plurality of pin portions spaced apart from each other in a planar arrangement wherein the pin portions of the layers are stacked and bonded to form pin fins extending in a transverse direction relative to the heat source to sink heat. A compliant layer is disposed between the pin fins and a mechanical load. The compliant layer provides compliance such that the pin fins accommodate dimensional differences when interfacing with the heat source.
1. A heat sink, comprising:
a plurality of layers being disposed substantially parallel with a surface of a heat source, such layers including:
a plurality of pin portions spaced apart from each other in a planar arrangement wherein each layer of pin portions in the planar arrangement is formed separate from adjacent layers of the heat sink and the pin portions of the layers are stacked and bonded to adjacent pin portions of the layers to form pin fins extending in a transverse direction relative to the heat source to sink heat such that the pin fins in the planar arrangement are free of interconnects between adjacent pin fins; and
at least one compliant layer disposed between the pin fins and a mechanical load, the at least one compliant layer providing compliance such that the pin fins accommodate dimensional differences when interfacing with the heat source.
2. The heat sink as recited in claim 1 , wherein the pin portions are bonded to at least one conformable layer, the conformable layer being coupled to the heat source.
3. The heat sink as recited in claim 2 , wherein the at least one conformable layer includes a thermally conductive material.
4. The heat sink as recited in claim 2 , wherein the at least one conformable layer includes an enclosure which encloses the pin fins to provide fluid flow in operation as a heat sink.
5. The heat sink as recited in claim 4 , wherein the enclosure includes a second conformable layer bonded to the pin fins and being coupled to the mechanical load.
6. The heat sink as recited in claim 4 , wherein the second conformable layer includes a thermally non-conductive material.
7. The heat sink as recited in claim 4 , wherein the enclosure includes the at least one compliant layer coupled to the pin fins.
8. The heat sink as recited in claim 1 , wherein the pin fins are configured to permit convective fluid flow therebetween using a coolant.
9. The heat sink as recited in claim 1 , wherein the heat source includes single chip or multiple chip modules.
10. The heat sink as recited in claim 1 , wherein each of the pin portions comprises a thickness, and the planar arrangement is disposed within a region of the thickness of the pin portions.
11. The heat sink as recited in claim 1 , wherein the pin portions include at least one shape comprising at least one of a circle, an oval, a segment and/or a polygon.
12. The heat sink as recited in claim 1 , wherein the at least one compliant layer further comprises at least one of an inlet or outlet.
13. The heat sink as recited in claim 1 , wherein the at least one compliant layer comprises corrugated metal.
14. The heat sink as recited in claim 2 , wherein the at least one conformable layer further comprises at least one of an inlet or outlet.
15. The heat sink as recited in claim 4 , further comprising at least one flow blocking structure disposed laterally between the enclosure and the pin fins.
16. The heat sink as recited in claim 15 , wherein the at least one flow blocking structure comprises an elastomer material.