Vehicle with vibration isolated electronics

Patent metadata

Field	Value
Publication number	US-11054193-B2
Application number	US-201815993048-A
Country	US
Kind code	B2
Filing date	May 30, 2018
Priority date	May 30, 2018
Publication date	Jul 6, 2021
Grant date	Jul 6, 2021

Abstract

A vehicle such as an unmanned aerial vehicle (UAV) can include a heat-generating electronic device coupled with a heat exhaust element by a vibration isolating thermal connector. The thermal connector includes a first heat-conducting element configured to draw heat from the electronic device, a second heat-conducting element separated from the first heat-conducting element, and a flexible seal connected with the first and second heat-conducting elements and defining an enclosed cavity between the elements. The enclosed cavity contains a heat conducting liquid, and allows limited movement of the first and second heat conducting elements with respect to each other while maintaining thermal connection.

First claim

What is claimed is:

1. An unmanned aerial vehicle (UAV), comprising:
a frame coupled with a plurality of thrust elements;
a heat exhaust element coupled with the frame and having a first heat conducting element;
a control element comprising a heat generating electronic element comprising an electronics board and an integrated chip mounted to the electronics board; and
a second heat conducting element integral to or coupled with the integrated chip to draw heat from the integrated chip, the second heat conducting element of the heat generating electronic element being thermally coupled with the first heat conducting element of the heat exhaust element by a thermally conductive vibration isolating connector comprising a flexible seal that encloses a thermally conductive liquid medium, the thermally conductive liquid medium separating the first and second heat conducting elements, wherein the thermally conductive vibration isolating connector supports the heat generating electronic element relative to the heat exhaust element, physically separates the heat generating electronic element from the frame, and accommodates relative movement of the heat generating electronic element relative to the frame and the heat exhaust element.

2. The UAV of claim 1 , wherein the heat exhaust element is positioned at least partially external to the frame such that operation of the UAV causes an external flow of air to pass over the heat exhaust element.

3. The UAV of claim 1 , wherein the control element is mechanically connected with the heat exhaust element or with the frame by at least one mechanical vibration isolating connector in addition to and separate from the thermally conductive vibration isolating connector.

4. The UAV of claim 1 , wherein the control element is mechanically connected with the heat exhaust element and supported therefrom by only the thermally conductive vibration isolating connector.

5. The UAV of claim 1 , wherein the control element is supported above the heat exhaust element by the thermally conductive vibration isolating connector.

6. The UAV of claim 1 , wherein the thermally conductive vibration isolating connector comprises a gap between the first and second thermally conductive elements of 5-15 mm that can repeatedly compress or extend by at least 30%.

7. The UAV of claim 1 , wherein the thermally conductive liquid medium comprises one of a liquid metal, liquid metal alloy, or liquid/particulate suspension that has a thermal conductivity of at least 2 Wm −1 K −1 .

8. A vehicle, comprising:
a frame;
a heat exhaust element mounted to the frame and having a first heat conductive element; and
a heat generating electronic device comprising an electronics board, an integrated chip mounted to the electronics board, and a second heat conductive element integral to or connected to the integrated chip, wherein the first and second heat conductive elements are mechanically and thermally coupled by a thermally conductive vibration isolating connector comprising a flexible seal that encloses a thermally conductive liquid medium separating the first and second heat conducting elements such that the thermally conductive vibration isolating connector supports the heat generating electronic device relative to the heat exhaust element, physically separates the heat generating electronic device from the frame, and accommodates relative movement of the heat generating electronic device relative to the frame and the heat exhaust element.

9. The vehicle of claim 8 , wherein the heat exhaust element comprises a passive convection heat sink assembly having one or more heat exhaust fins positioned external to the frame and configured to interact with air in an external environment.

10. The vehicle of claim 8 , wherein the heat exhaust element comprises an active convection heat sink assembly having one or more heat exhaust fins thermally coupled with the second heat conducting element and one or more fans arranged to pass air from an over the one or more heat exhaust fins.

11. The vehicle of claim 8 , wherein the first and second heat conducting elements are separated by a distance of 1 mm to 15 mm.

12. The vehicle of claim 8 , wherein the first and second heat conducting elements comprise respective first and second heat conducting surfaces, and wherein at least one of the first and second heat conducting surfaces is coated with a corrosion-resistant layer configured to mitigate or prevent attack by the thermally conductive liquid medium.

13. The vehicle of claim 12 , wherein the corrosion-resistant layer comprises one or more of: graphite, graphene, cubic boron, zinc, nickel, diamond, amorphous carbon, or anodization.

14. The vehicle of claim 8 , wherein one or both of the first and second heat conducting elements comprise one or more of graphite, graphene, cubic boron, zinc, nickel, diamond, amorphous carbon, or anodization.

15. The vehicle of claim 8 , wherein the thermally conductive liquid medium comprises a liquid metal or liquid metal alloy selected from mercury, a gallium indium eutectic alloy, or similar metal; or a particulate suspension of oil or water containing heat conducting particles.

16. The vehicle of claim 8 , wherein the first and second heat conducting elements comprise respective first and second heat conducting surfaces, and wherein the first and second heat conducting surfaces further comprise high-surface area shapes selected from: alternating positive and negative surface features, ball-and-socket, or fins.

17. The vehicle of claim 8 , wherein the first heat conductive element comprises a first flanged structure, the second heat conductive element comprises a second flanged structure, the flexible seal is shaped to partly encompass the first and second flanged structures, and the thermally conductive liquid medium biases the first and second flanged structures away from each other and against the flexible seal.

18. The vehicle of claim 8 , wherein the electronics board is further suspended relative to the heat exhaust element by at least one vibration isolating mechanical connector separate from the thermally conductive vibration isolating connector.

19. A method of assembling a heat generating electronic device with a vehicle, the method comprising:
connecting a heat exhaust assembly with a frame of the vehicle; and
connecting the heat generating electronic device with the heat exhaust assembly by a thermally conductive vibration isolating connector, the thermally conductive vibration isolating connector comprising a first heat conducting element and a second heat conducting element separated by a nonzero distance, the first and second heat conducting elements connected by a flexible seal that encloses a thermally conductive liquid medium separating the first and second heat conducting elements, wherein:
the first heat conducting element is thermally connected with the heat exhaust assembly and the second heat conducting element is thermally connected with the heat generating electronic device, and
the thermally conductive vibration isolating connector supports the heat generating electronic device relative to the heat exhaust assembly, physically separates the heat generating electronic device from the frame, and accommodates relative movement of the heat generating electronic device relative to the frame and the heat exhaust assembly.

20. The method of claim 19 , further comprising mechanically connecting the heat generating electronic device with the frame of the vehicle by at least one mechanical

Assignees

• Amazon Tech Inc

Inventors

• Flowers Jonathan Barak

Classifications

• B64U20/92

  of avionics · CPC title

• B64U20/96

  using air · CPC title

• B64U20/98

  using liquid, e.g. using lubrication oil · CPC title

• H05K7/20454

  with a conformable or flexible structure compensating for irregularities, e.g. cushion bags, thermal paste · CPC title

• H05K7/20872

  Liquid coolant without phase change · CPC title