Heat dissipation module and electronic device

Patent metadata

Field	Value
Publication number	US-2017220084-A1
Application number	US-201615345051-A
Country	US
Kind code	A1
Filing date	Nov 7, 2016
Priority date	Feb 2, 2016
Publication date	Aug 3, 2017
Grant date	—

Abstract

A heat dissipation module being disposed in an electronic device is provided. The electronic device has a heat source. The heat dissipation module includes an evaporator, a pipe, a magnetic field generator and a plurality of magnetic powder. The heat source is heat conducting to the evaporator. The pipe is connected to the evaporator to form a loop therewith, and a working fluid is filled in the loop. The magnetic field generator is disposed outside of the evaporator. The magnetic powder is movably disposed in the evaporator. A magnetic field generated by the magnetic field generator drives the magnetic powder to form a channel in the evaporator where the working fluid passes through. The heat generated by the heat source is transmitted to the evaporator, and the working fluid in liquid phase absorbs the heat and is phase-transited to vapor phase and flows from the evaporator towards the pipe.

First claim

What is claimed is:

1 . A heat dissipation module, disposed in an electronic device, the electronic device having a heat source, the heat dissipation module comprising:
an evaporator, heat conducting to the heat source; a pipe, connecting to the evaporator to form a loop therewith, wherein a working fluid is filled in the loop; a magnetic field generator, disposed outside of the evaporator; and a plurality of magnetic powder, movably disposed in the evaporator, wherein a magnetic field generated by the magnetic field generator drives the magnetic powder to form a channel in the evaporator where the working fluid passes through, heat generated by the heat source is transmitted to the evaporator, and the working fluid in liquid phase absorbs the heat and is phase-transited to vapor phase and flows towards the pipe.

2 . The heat dissipation module according to claim 1 , wherein the magnetic powder forms a capillary structure in the evaporator.

3 . The heat dissipation module according to claim 1 , wherein the magnetic field generator generates a variable magnetic field to drive the magnetic powder to change a position of the magnetic powder in the evaporator so as to form the channel having a variable profile.

4 . The heat dissipation module according to claim 3 , wherein the magnetic field generator comprises an electromagnet.

5 . The heat dissipation module according to claim 1 , wherein the evaporator has an inlet and an outlet, the pipe connects the inlet and the outlet to form the loop, and the magnetic field generator comprises:
at least one first magnetic member, disposed outside the evaporator and adjacent to the inlet, wherein the first magnetic member provides a constant magnetic field to limit the magnetic powder in the evaporator; and at least one second magnetic member, disposed outside the evaporator and adjacent to the outlet, wherein the second magnetic member provides a variable magnetic field to drive the magnetic powder to change a position of the magnetic powder in the evaporator.

6 . The heat dissipation module according to claim 5 , wherein the first magnetic member is a permanent magnet, and the second magnetic member is an electromagnet.

7 . The heat dissipation module according to claim 5 , wherein the first magnetic member and the second magnetic member are disposed with respect to the evaporator and along a gravity direction.

8 . An electronic device, comprising:
a first body; a second body, pivotally connected to the first body, so that the first body and the second body open and close with respect to each other; a heat source; an evaporator, disposed at a position where the first body and the second body are pivotally connected, wherein the heat source is heat conducting to the evaporator; a pipe, connected to the evaporator to form a loop therewith, wherein a working fluid is filled in the loop; a magnetic field generator, disposed outside the evaporator; and a plurality of magnetic powder, movably disposed in the evaporator, wherein a magnetic field generated by the magnetic field generator drives the magnetic powder to form a channel in the evaporator where the working fluid passes through, the heat generated by the heat source is transmitted to the evaporator, and the working fluid in liquid phase absorbs the heat and is phase-transited to vapor phase and flows from the evaporator towards the pipe.

9 . The electronic device according to claim 8 , wherein the magnetic field generator comprises an electromagnet, and the electronic device further comprises:
a control module, electrically connected to the electromagnet, wherein the control module adjusts a magnetic field generated by the electromagnet according to an open/close angle between the first body and the second body, so as to drive the magnetic powder to change its position in the evaporator to form the channel having a variable profile.

10 . The electronic device according to claim 9 , wherein the evaporator has an inlet and an outlet, the pipe connects the inlet and the outlet to form the loop, the control module drives the electromagnet to generate a first magnetic field when the first body and the second body open with respect to each other in a first state, so that the channel formed by the magnetic powder in the evaporator has a first inner diameter, and the first inner diameter is smaller than an inner diameter of the inlet and an inner diameter of the outlet so as to drive the working fluid to flow in the loop.

11 . The electronic device according to claim 10 , wherein after the first body and the second body are in the first state and the working fluid is driven to flow in the loop, the control module drives the electromagnet to generate a second magnetic field, so that the channel formed by the magnetic powder in the evaporator has a second inner diameter, and the second inner diameter is greater than the first inner diameter.

12 . The electronic device according to claim 11 , wherein the open/close angle between the first body and the second body is 90 degrees.

13 . The electronic device according to claim 9 , wherein the evaporator has an inlet and an outlet, the pipe connects the inlet and the outlet to form the loop, the control module drives the electromagnet to generate a third magnetic field when the first body and the second body open with respect to each other in a second state, so that the channel formed by the magnetic powder in the evaporator has a barrier and a third inner diameter, the third inner diameter is smaller than the inner diameter of the inlet and the inner diameter of the outlet so as to drive the working fluid to flow in the loop, and the barrier blocks the working fluid in vapor phase from flowing from the outlet to the inlet.

14 . The electronic device according to claim 13 , wherein after the first body and the second body are in the second state and the working fluid is driven to flow in the loop, the control module drives the electromagnet to generate a fourth magnetic field, so that the channel formed by the magnetic powder in the evaporator has a fourth inner diameter, and the fourth inner diameter is greater than the third inner diameter.

15 . The electronic device according to claim 13 , wherein the open/close angle between the first body and the second body is 180 degrees.

Assignees

• Acer Inc

Inventors

• Wang Yung-Chih
• Liao Wen-Neng
• Hsieh Cheng-Wen

Classifications

• G06F1/206 Primary

  comprising thermal management · CPC title

• H05K7/20309

  Evaporators · CPC title

• H05K7/20436

  Inner thermal coupling elements in heat dissipating housings, e.g. protrusions or depressions integrally formed in the housing · CPC title

• F28D15/046

  characterised by the material or the construction of the capillary structure · CPC title

• F28D15/043

  forming loops, e.g. capillary pumped loops · CPC title