Heat pipe with pumping capabilities and use thereof in cooling a device

• US 6,209,626 B1
• Filed: 01/11/1999
• Issued: 04/03/2001
• Est. Priority Date: 01/11/1999
• Status: Expired due to Term

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Bhatia, Rakesh
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): MCKINNON, TERRELL L
• Application Number:
  US09/228,817
• Time in Patent Office: 813 Days
• Field of Search: 165/104.26, 165/104.33, 165/104.31, 165/104.34, 165/104.25, 361/687, 174/15.2
• US Class Current: 165/104.25
• CPC Class Codes: F28D 15/025 having non-capillary condensate return means
• CPC Class Codes: F28D 15/04 with tubes having a capillary structure
• CPC Class Codes: H01L 23/427 Cooling by change of state, e.g. use of heat pipes by liquefied gas H01L23/445
• 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

Abstract

A heat pipe with pumping capabilities and use thereof in cooling a device. One embodiment of the heat pipe has an internal pumping mechanism that provides an enhanced capillary flow within a chamber of the heat pipe.

Claims

1. A heat pipe having an internal pumping mechanism that provides an enhanced capillary flow within a chamber of said heat pipe, said internal pumping mechanism being a motor-driven pumping mechanism, wherein a barrier member blocks the return of working fluid to a vapor flow region.

2. The heat pipe of claim 1 wherein the barrier member is a rotatable barrier member.

3. An apparatus comprising:

a heat pipe having an evaporator portion, a condenser portion, and a wick portion, wherein said heat pipe includes a barrier portion blocks the return of working fluid to a vapor flow region;

a working fluid within said heat pipe;

a pumping mechanism, the pumping mechanism being positioned to enhance capillary flow of the working fluid through the wick portion from the condenser portion toward the evaporator portion, the pumping mechanism being a motor-driven pumping mechanism.

4. The apparatus of claim 3 further comprising:

an electrical motor outside of said heat pipe drivingly coupled to said pumping mechanism.

5. The apparatus of claim 3 wherein the barrier portion is a rotatable barrier portion.

6. The apparatus of claim 3 wherein said heat pipe forms a shared chamber for both capillary flow of a liquid phase of said working fluid and a vapor phase of said working fluid.

7. The apparatus of claim 3 wherein said pumping mechanism has an inlet drawing working fluid from a vapor flow portion of the heat pipe and an outlet operatively engaging the wick portion.

8. The apparatus of claim 7 further comprising an outflow chamber located at the outlet of the pumping mechanism, the outflow chamber being sealed to provide working fluid outflow substantially only through the wick portion.

9. The apparatus of claim 3 wherein said pumping mechanism is positioned adjacent to said condenser portion.

10. The apparatus of claim 9 wherein said apparatus further comprises a reservoir portion adjacent to said pumping mechanism, the pumping mechanism having an outflow directed through the reservoir portion to the wick portion.

11. The apparatus of claim 10 further comprising a rotatable barrier member that rotates based on an orientation of said apparatus, the rotatable barrier member having open bottom portion which directs outflow of said pumping mechanism through said reservoir portion to said wick portion.

12. The apparatus of claim 3 wherein said pumping mechanism is positioned adjacent to said evaporator portion.

13. The apparatus of claim 12 wherein said pumping mechanism has an inlet drawing working fluid from the wick portion.

14. The apparatus of claim 3 further comprising:

a sensor positioned to sense a dry out condition in the evaporator portion; and

a control circuit coupled to control the pumping mechanism as a function of signals received from the sensor.

15. An electronic device comprising:

a housing having an electronic component therein;

a heat dissipation mechanism; and

a heat pipe thermally coupling said electronic component and said heat dissipation mechanism and having an internal pumping mechanism that provides an enhanced capillary flow within a chamber of said heat pipe, the internal pumping mechanism being a motor-driven pumping mechanism, wherein said heat pipe includes a barrier portion blocks the return of working fluid to a vapor flow region.

16. The electronic device of claim 15 wherein said electronic device is a portable computing device and wherein said electronic component is a microprocessor.

17. The electronic device of claim 16 further comprising:

a sensor positioned to sense a dry out condition in a portion of the heat pipe thermally coupled to the microprocessor, and

a control circuit coupled to control the internal pumping mechanism as a function of signals received from the sensor.

18. A portable computing device comprising:

a base portion having a plurality of heat generating components therein;

a power chord extending from said electronic device, the power chord comprising;

a heat pipe thermally coupled to dissipate heat from the base portion, the heat pipe having an internal pumping mechanism that provides an enhanced capillary flow within a chamber of said heat pipe, wherein said heat pipe includes a barrier portion blocks the return of working fluid to a vapor flow region; and

a heat dissipation mechanism thermally coupled to the heat pipe.

19. The portable computing device of claim 18 wherein the power chord further contains a power conversion brick and said heat dissipation mechanism is provided in said power conversion brick.

20. An apparatus comprising:

a heat pipe means for containing a vapor phase and a fluid phase of a working fluid, wherein said heat pipe includes a barrier portion blocks the return of working fluid to a vapor flow region; and

a pumping means for enhancing capillary flow of said fluid phase in said heat pipe means, said pumping means being motor driven.