MICROFLUIDIC CHANNELS AND PUMPS FOR ACTIVE COOLING OF CABLES

• US 20200135365A1
• Filed: 10/30/2018
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Original Assignee: Amazon Technologies, Inc. (Amazon.com, Inc.)
• Inventors: Flowers, Jonathan Barak, Mehnert, Herbert
• Granted Patent: US 11,062,824 B2
• Time in Patent Office: Days
• CPC Class Codes: F04B 15/00 Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
• CPC Class Codes: F04B 17/03 driven by electric motors
• CPC Class Codes: F04B 43/12 having peristaltic action
• CPC Class Codes: H01B 3/46 silicones
• CPC Class Codes: H01B 7/423 using a cooling fluid
• CPC Class Codes: H01B 7/426 using cooling fins, ribs
• CPC Class Codes: H05K 1/0201 Thermal arrangements, e.g. for cooling, heating or preventing overheating
• CPC Class Codes: H05K 1/0203 Cooling of mounted components H05K1/0272 takes precedence
• CPC Class Codes: H05K 1/0272 Adaptations for fluid transport, e.g. channels, holes
• CPC Class Codes: H05K 1/09 Use of materials for the conductive, e.g. metallic pattern
• CPC Class Codes: H05K 2201/064 Fluid cooling, e.g. by integral pipes
• CPC Class Codes: H05K 2201/066 Heatsink mounted on the surface of the printed circuit board [PCB]

Abstract

Fluidic channels and pumps for active cooling of cables are described. One cable assembly includes a conductor having a length between a first end of the cable and a second end of the cable and a fluidic channel structure that at least partially surrounds the conductor along the length of the conductor. A first pump connector is coupled to a first end of the fluidic channel structure and a second pump connector is coupled to a second end of the fluidic channel structure. Motion of liquid metal, when pumped through the fluidic channel structure, distributes heat away from the conductor.

Claims

1. A cable assembly comprising:

a cable comprising;

a conductor having a length between a first end of the cable and a second end of the cable; and

a fluidic channel structure that surrounds the conductor along the length of the cable, wherein the fluidic channel structure comprises;

a passivation layer surrounding the conductor along the length of the conductor;

a polymer layer surrounding the passivation layer along the length of the conductor;

a support structure disposed between the passivation layer and the polymer, wherein the passivation layer, the polymer layer, and the support structure form a fluidic channel surrounding the conductor along the length of the cable;

a first pump connector coupled to a first end of the fluidic channel structure, the first end of the fluidic channel structure corresponding to the first end of the cable;

a second pump connector coupled a second end of the fluidic channel structure, the second end of the fluidic channel structure corresponding to the second end of the cable; and

a liquid-metal pump coupled to at least one of the first pump connector or the second pump connector, wherein the liquid-metal pump pumps liquid metal through the fluidic channel, wherein motion of the liquid metal through the fluidic channel distributes heat away from the conductor.

2. The cable assembly of claim 1, wherein:

a first portion of the fluidic channel structure forms a first liquid-metal channel partially surrounding an upper portion of the passivation layer; and

a second portion of the fluidic channel structure forms a second liquid-metal channel partially surrounding a lower portion of the passivation layer.

3. The cable assembly of claim 1, further comprising:

a heat sink coupled to at least one of the first pump connector or the second pump connector.

4. The cable assembly of claim 1, wherein the first pump connector comprises an inlet coupled between the first end of the fluidic channel and an output of the liquid-metal pump, and wherein the second pump connector comprises an outlet coupled between the second end of the fluidic channel and an input of the liquid-metal pump.

5. An apparatus comprising:

a conductor having a length between a first end and a second end; and

a fluidic channel structure that at least partially surrounds the conductor along the length of the conductor;

a first pump connector coupled to a first end of the fluidic channel structure; and

a second pump connector coupled to a second end of the fluidic channel structure, wherein motion of liquid metal, when pumped through the fluidic channel structure, distributes heat away from the conductor.

6. The apparatus of claim 5, wherein the fluidic channel structure comprises:

a passivation layer surrounding the conductor along the length of the conductor;

a polymer layer surrounding the passivation layer along the length of the conductor; and

a support structure to create a fluidic channel between the passivation layer and the polymer layer.

7. The apparatus of claim 5, wherein the fluidic channel structure comprises:

a passivation layer surrounding the conductor along the length of the conductor;

a polymer layer surrounding the passivation layer along the length of the conductor; and

a support structure to create a first fluidic channel and a second fluidic channel between the passivation layer and the polymer layer.

8. The apparatus of claim 5, further comprising:

a heat sink coupled to at least one of the first pump connector or the second pump connector.

9. The apparatus of claim 6, wherein the passivation layer comprises metal oxide material, wherein the polymer layer comprises polymeric organosilicon material.

10. The apparatus of claim 9, wherein the polymeric organosilicon material is Polydimethylsiloxane (PDMS).

11. The apparatus of claim 5, further comprising:

a mechanical pump;

inlet tubing coupled to a first end of the fluidic channel structure; and

outlet tubing coupled to a second end of the fluidic channel structure, wherein the mechanical pump is to mechanically pump the liquid metal through the fluidic channel structure.

12. The apparatus of claim 11, wherein the mechanical pump is a peristaltic/systolic pump.

13. The apparatus of claim 5, further comprising a non-mechanical pump, wherein the non-mechanical pump is to pump the liquid metal through the fluidic channel using at least one of electrostatic forces, electromagnetic forces, electrohydraulic forces, or Electrohydrostatic forces.

14. The apparatus of claim 13, wherein the non-mechanical pump is at least one of an electrostatic pump or electrostatic fluid accelerator (EFA).

15. The apparatus of claim 5, wherein the liquid metal is a eutectic alloy comprising at least gallium and indium.

16. A system comprising:

a liquid-metal pump; and

a cable comprising;

a conductor having a length between a first end of the cable and a second end of the cable; and

a fluidic channel structure that at least partially surrounds the conductor along the length of the conductor;

a pump connector coupled between the fluidic channel structure and the liquid-metal pump, wherein the liquid-metal pump is configured to pump liquid metal through fluidic channel of the fluidic channel structure, wherein motion of the liquid metal through the fluidic channel distributes heat away from at least a portion the conductor.

17. The system of claim 16, wherein the fluidic channel structure comprises:

a passivation layer surrounding the conductor along the length of the conductor;

a polymer layer surrounding the passivation layer along the length of the conductor; and

a support structure to create a fluidic channel between the passivation layer and the polymer layer, wherein the liquid metal is a eutectic alloy comprising at least gallium and indium, wherein the passivation layer comprises metal oxide material, and wherein the polymer layer comprises polymeric organosilicon material.

18. The system of claim 16, wherein the liquid metal is a Eutectic Gallium Indium (EGaIn) alloy.

19. The system of claim 16, wherein the liquid-metal pump comprises a mechanical pump.

20. The system of claim 16, wherein the liquid-metal pump comprises a non-mechanical pump.