Loop heat pipe, manufacturing method thereof, and electronic device

Patent metadata

Field	Value
Publication number	US-10420253-B2
Application number	US-201816180648-A
Country	US
Kind code	B2
Filing date	Nov 5, 2018
Priority date	May 9, 2016
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

A loop heat-pipe includes an evaporator; a condenser; a first line which connects the evaporator to the condenser and in which working fluid of vapor phase flows; and a second line which connects the condenser to the evaporator and in which working fluid of liquid phase flows, wherein each of the evaporator, the condenser, the first line, and the second line is bonded to a first and second plate, the first plate includes in a region for the evaporator: first protrusions that extend in a length direction, and second protrusions that extend in a width direction, which intersects with the length direction; the second plate includes in a region for the evaporator: either or both of third protrusions extending in the length direction and fourth protrusions extending in the width direction, and recesses partitioned by either or both of the third protrusions and the fourth protrusions.

First claim

What is claimed is:

1. A loop heat pipe comprising:
an evaporator;
a condenser;
a first line which connects the evaporator to the condenser and in which working fluid of vapor phase flows; and
a second line which connects the condenser to the evaporator and in which working fluid of liquid phase flows, wherein
the evaporator, the condenser, the first line, and the second line constitute a structure by bonding a first plate and a second plate,
the first plate includes in a region for the evaporator:
a plurality of first protrusions that extend in a length direction of the evaporator from an end side connected to the second line toward an end side connected to the first line;
a plurality of second protrusions that extend in a width direction of the evaporator, which intersects with the length direction; and
a plurality of first recesses which are partitioned by the plurality of first protrusions and the plurality of second protrusions,
the second plate includes in a region for the evaporator:
either or both of a plurality of third protrusions extending in the length direction and a plurality of fourth protrusions extending in the width direction; and
a plurality of second recesses partitioned by either or both of the plurality of third protrusions and the plurality of fourth protrusions,
the first plate and the second plate are bonded to each other so that in the region, the plurality of first recesses face either or both of the plurality of third protrusions and the plurality of fourth protrusions while each of the plurality of first recesses communicates with the second recesses located on both sides of a corresponding third or fourth protrusion or any combination thereof.

2. The loop heat pipe according to claim 1 , wherein
the plurality of first protrusions extend parallel to each other,
the plurality of second protrusions extend parallel to each other and are orthogonal to the plurality of first protrusions,
when the second plate includes the plurality of third protrusions, the plurality of third protrusions extend parallel to each other and parallel to the plurality of first protrusions, and
when the second plate includes the plurality of fourth protrusions, the plurality of fourth protrusions extend parallel to each other and parallel to the plurality of second protrusions.

3. The loop heat pipe according to claim 1 , wherein
the plurality of first protrusions extend parallel to each other,
the plurality of second protrusions extend parallel to each other and diagonally intersect with the plurality of first protrusions,
when the second plate includes the plurality of third protrusions, the plurality of third protrusions extend parallel to each other and are parallel to the plurality of first protrusions, and
when the second plate includes the plurality of fourth protrusions, the plurality of fourth protrusions extend parallel to each other and extend parallel to the plurality of second protrusions.

4. The loop heat pipe according to claim 1 , wherein
intervals of the plurality of first protrusions, intervals of the plurality of second protrusions, and intervals of either or both of the plurality of third protrusions and the plurality of fourth protrusions are a same.

5. The loop heat pipe according to claim 1 , wherein
the second plate includes the plurality of third protrusions, the plurality of fourth protrusions, and the plurality of second recesses partitioned by the plurality of third protrusions and the plurality of fourth protrusions, and
the plurality of first recesses and the plurality of second recesses have a same size.

6. The loop heat pipe according to claim 1 , wherein
in the first plate, the first protrusion and the second protrusion that constitute a side surface of each of the plurality of first recesses are made of a same material as that of the bottom surface of the first recess, and
in the second plate, at least one of the third and fourth protrusions that constitute a side surface of each of the plurality of second recesses is made of the same material as that of the bottom surface of the second recess.

7. The loop heat pipe according to claim 1 , wherein
portions of the first and second protrusions constituting the side surface of each of the plurality of first recesses include first communicating grooves configured to allow adjacent first recesses to communicate with each other.

8. The loop heat pipe according to claim 7 , wherein
the second plate includes the plurality of third protrusions, the plurality of fourth protrusions, and the plurality of second recesses partitioned by the plurality of third protrusions and the plurality of fourth protrusions, and
the third and fourth protrusions constituting the side surface of each of the plurality of second recesses include second communicating grooves configured to allow adjacent second recesses to communicate with each other.

9. The loop heat pipe according to claim 1 , wherein
the evaporator includes:
a comb-shaped evaporator which extends from an end connected to the liquid line and divides to a plurality of branch portions and in which the working fluid of liquid phase penetrates and becomes vapor phase; and
a comb-like vapor channel which is provided facing the comb-shaped evaporator, extends from an end connected to the first line, and divides into a plurality of branch vapor channels and in which the working fluid of vapor phase flows,
the first plate includes the plurality of first protrusions, the plurality of second protrusions, and the plurality of first recesses in a region constituting the comb-shaped evaporator, and
the second plate includes either or both of the plurality of third protrusions and the plurality of fourth protrusions and the plurality of second recesses in the region constituting the comb-shaped evaporator.

10. The loop heat pipe according to claim 9 , wherein
in the comb-like vapor channel, a channel width of each of the plurality of branch vapor channels is greater than the intervals of the plurality of first protrusions.

11. The loop heat pipe according to claim 9 , wherein
each of the plurality of branch portions of the comb-shaped evaporator includes a third communicating groove that allows adjacent two branch vapor channels of the plurality of branch vapor channels of the comb vapor channel to communicate with each other.

12. The loop heat pipe according to claim 11 , wherein
the third communicating groove is provided for at least one of the first or second plates or any combination thereof.

13. The loop heat pipe according to claim 1 , wherein
the first plate includes, in a region constituting the liquid line, a plurality of first liquid-line protrusions extending in the length direction, a plurality of second liquid-line protrusions extending in the width direction, and a plurality of first liquid-line recesses partitioned by the plurality of first liquid-line protrusions and the plurality of second liquid-line protrusions,
the second plate includes, in the region constituting the liquid line, either or both of a plurality of third liquid-line protrusions extending in the length direction and a plurality of fourth liquid-line protrusions extending in the width direction and a plurality of second liquid-line recesses partitioned by either or both of the plurality of third liquid-line protrusions and the plurality of fourth liquid-line protrusions, and
the first and second plates are bonded so that in the region constituting the liquid line, the plurality of first liquid-line recesses face either or both of the plurality of third liquid-line protrusions and the plurality of fourth liquid-

Assignees

• Fujitsu Ltd

Inventors

• Shioga Takeshi
• Abe Tomoyuki

Classifications

• H10W40/258

  Metallic materials (H10W40/254, H10W40/257, H10W40/255, H10W40/251, H10W40/253 take precedence) · CPC title

• H10W40/73

  for cooling by change of state · CPC title

• F28D15/02

  in which the medium condenses and evaporates, e.g. heat pipes {(heat pipes used in solar heat collectors F24S10/95; in radiators F28D1/0226; in nuclear reactors G21C15/257)} · CPC title

• F28D15/04

  with tubes having a capillary structure · CPC title

• H05K7/20327

  Accessories for moving fluid, for connecting fluid conduits, for distributing fluid or for preventing leakage, e.g. pumps, tanks or manifolds · CPC title