System and method for maintaining efficiency of a heat sink

• US 10,830,545 B2
• Filed: 07/12/2017
• Issued: 11/10/2020
• Est. Priority Date: 07/12/2016
• Status: Active Grant

• Current Assignee: Fractal Heatsink Technologies LLC
• Original Assignee: Fractal Heatsink Technologies LLC
• Inventors: Poltorak, Alexander
• Primary Examiner(s): Dravininkas, Adam B
• Application Number:
  US15/648,065
• Publication Number:
  US 20180017345A1
• Time in Patent Office: 1,217 Days
• CPC Class Codes: F28D 2021/0029 Heat sinks
• CPC Class Codes: F28F 13/12 by creating turbulence, e.g. by stirring, by increasing the force of circulation F28F13/08 takes precedence
• CPC Class Codes: F28F 2215/10 Secondary fins, e.g. projections or recesses on main fins
• CPC Class Codes: F28F 2255/14 molded
• CPC Class Codes: F28G 1/16 using jets of fluid for removing debris F28G1/12 takes precedence
• CPC Class Codes: F28G 13/00 Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
• CPC Class Codes: F28G 15/003 Control arrangements
• CPC Class Codes: F28G 7/00 Cleaning by vibration or pressure waves
• CPC Class Codes: F28G 9/00 Cleaning by flushing or washing, e.g. with chemical solvents appliances using jets of fluid for removing debris F28G1/16, F28G3/16
• CPC Class Codes: F28G 9/005 of regenerative heat exchanger
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 7/20418 the radiating structures being additional and fastened onto the housing

Abstract

A heatsink comprising a heat exchange device having a plurality of heat exchange elements each having a surface boundary with respect to a heat transfer fluid, having successive elements or regions having varying size scales. According to one embodiment, an accumulation of dust or particles on a surface of the heatsink is reduced by a removal mechanism. The mechanism can be thermal pyrolysis, vibration, blowing, etc. In the case of vibration, adverse effects on the system to be cooled may be minimized by an active or passive vibration suppression system.

Claims

1. A heatsink system comprising:

a base structure configured to mechanically and thermally interface with a heat source;

a heat exchange device configured to receive heat from the base structure, and emit the received heat from a heat exchange surface of a plurality of heat exchange elements, into an external surrounding heat exchange medium, the heat exchange surface being subject to accumulation of particles, the heat exchange device being rigid and configured to communicate vibrations to the base structure;

a particle accumulation reducing device, configured to decrease an accumulation of particles on the plurality of heat exchange elements by causing the vibrations;

a feedback transducer configured to detect vibrations;

an electronic control configured to process the detected vibrations, and produce a control signal; and

an electrical-vibration transducer, which receives the control signal, configured to generate vibrations based on the control signal,

wherein the electronic control controls the electrical-vibration transducer to cancel vibrations, and the base structure actively cancels vibrations received by the heat source from the heat exchange device due to the particle accumulation reducing device.

2. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises a vibrator configured to vibrate the plurality of heat exchange elements comprising the heat exchange surface.

3. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises at least one of a piezoelectric transducer, an electromagnetic transducer, and a rotating motor, configured to induce a vibration in the plurality of heat exchange elements.

4. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises an electrostatic charge generator;

and an electrostatic discharge device.

5. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises at least one of:

a bimetal element configured to undergo a shape change responsive to temperature;

a shape memory alloy configured to undergo a shape change as a result of transition through a predefined temperature range;

an active actuator configured to alter at least one spatial relationship of a first of the plurality of heat exchange elements with respect to a second of the plurality of heat exchange elements in response to a control signal; and

a passive actuator configured to alter at least one spatial relationship of a first of the plurality of heat exchange elements with respect to a second of the plurality of heat exchange elements in response to an environmental change,

to thereby at least one of disrupt an accumulation of particles and alter a flow of a gas or fluid proximate to the accumulation of particles.

6. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises an active actuator controlled by an automated electronic processor in dependence on a computational heat exchange model of the heatsink system, the computational heat exchange model predicting at least a degradation in heat transfer performance of the heat exchange device due to accumulation of particles.

7. The heatsink system according to claim 2, wherein the electrical-vibration transducer comprises a vibrational transducer, controlled to cancel vibrations at the base structure produced by the particle accumulation reducing device.

8. The heatsink system according to claim 2, further comprising a vibration damper configured to damp vibrations at the base structure generated by the particle accumulation reducing device.

9. The heatsink system according to claim 8, wherein the vibration damper comprises a non-shear transmissive copper wire bundle.

10. The heatsink system according to claim 2, wherein the base structure further comprises an anisotropic vibration transmissive mount configured to isolate vibrations from the heat source.

11. The heatsink system according to claim 1, wherein the heat exchange surface comprises a plurality of heat exchange elements having a plurality of resonant vibration frequencies within a frequency range, and the particle accumulation reducing device comprises an electrical-vibration transducer and an oscillating signal generator, configured to generate vibrations over the frequency range, to resonate the plurality of heat exchange elements at the plurality of resonant frequencies.

12. The heatsink system according to claim 1, wherein the heat exchange surface comprises a plurality of heat exchange elements having characteristic dimensions which vary over at least two orders of magnitude.

13. The heatsink system according to claim 1, wherein the plurality of heat exchange elements have an approximately fractal geometry in at least two dimensions.

14. The heatsink system according to claim 1, wherein the particle accumulation reducing device comprises a vibration feedback-controlled electrically-operated vibration transducer.