Loop heat pipe

Patent metadata

Field	Value
Publication number	US-11060797-B2
Application number	US-201916351724-A
Country	US
Kind code	B2
Filing date	Mar 13, 2019
Priority date	Mar 16, 2018
Publication date	Jul 13, 2021
Grant date	Jul 13, 2021

Abstract

A loop heat pipe includes a metal layer stack of outermost metal layers and intermediate metal layers. The metal layer stack includes an evaporator that vaporizes a working fluid, a condenser that liquefies the working fluid vaporized by the evaporator, a vapor pipe connecting the evaporator to the condenser, and a liquid pipe connecting the condenser to the evaporator. The vapor pipe includes two pipe walls defining a flow passage of the vapor pipe and joint beams arranged at different positions along the flow passage. Each of the joint beams joins the two pipe walls to each other. Each of the intermediate metal layers includes one of the joint beams. Each of the joint beams includes a side surface that is inclined.

First claim

What is claimed is:

1. A loop heat pipe comprising:
a metal layer stack of two outermost metal layers and intermediate metal layers stacked between the two outermost metal layers, wherein
the metal layer stack includes
an evaporator that vaporizes a working fluid,
a condenser that liquefies the working fluid vaporized by the evaporator,
a vapor pipe connecting the evaporator to the condenser, and
a liquid pipe connecting the condenser to the evaporator,

the vapor pipe includes
two pipe walls defining a flow passage of the vapor pipe, and
joint beams arranged along the flow passage in positions that do not overlap with each other in a plan view, each of the joint beams being continuous with two pipe walls and joining the two pipe walls to each other,

each of the intermediate metal layers includes one of the joint beams, and
said each of the joint beams includes a side surface that is inclined, wherein the side surface of said each of the joint beams is concave-curved.

2. The loop heat pipe according to claim 1 , wherein
said each of the joint beams includes a first surface and a second surface located at opposite sides in a thickness-wise direction,
the first surface of said each of the joint beams has a smaller area than the second surface of said each of the joint beams, and
the side surface of said each of the joint beams is inclined in an outer direction from the first surface of said each of the joint beams toward the second surface of said each of the joint beams.

3. The loop heat pipe according to claim 2 , wherein the second surface of any one of the joint beams is connected to one of the two outermost metal layers.

4. The loop heat pipe according to claim 1 , wherein
said each of the joint beams includes a first surface and a second surface located at opposite sides in a thickness-wise direction,
the side surface of said each of the joint beams includes
a first side surface inclined in an outer direction from the first surface of said each of the joint beams toward the second surface of said each of the joint beams,
a second side surface inclined in the outer direction from the second surface of said each of the joint beams toward the first surface of said each of the joint beams, and
a projection projecting in the outer direction at a boundary portion of the first side surface of the side surface of said each of the joint beams and the second side surface of the side surface of said each of the joint beams.

5. The loop heat pipe according to claim 4 , wherein the first side surface of the side surface of said each of the joint beams and the second side surface of the side surface of said each of the joint beams differ in length in the thickness-wise direction.

6. The loop heat pipe according to claim 4 , wherein
the first side surface of the side surface of said each of the joint beams is longer than the second side surface of the side surface of said each of the joint beams in the thickness-wise direction, and
the second surface of any one of the joint beams is connected to one of the two outermost metal layers.

7. The loop heat pipe according to claim 1 , wherein
said each of the intermediate metal layers includes two walls forming the two pipe walls of the vapor pipe, and
said each of the joint beams is at least partially thinner than each of said two walls of a corresponding one of the intermediate metal layers.

8. The loop heat pipe according to claim 7 , wherein
the intermediate metal layers include
a first intermediate metal layer directly connected to one of the two outermost metal layers, and
a second intermediate metal layer directly connected to the other one of the two outermost metal layers,

the joint beams include
a first joint beam arranged in the first intermediate metal layer, and
a second joint beam arranged in the second intermediate metal layer, and

at least one of the first joint beam and the second joint beam is spaced apart from a corresponding one of the two outermost metal layers and forms a flow passage space in which the working fluid flows.

9. The loop heat pipe according to claim 7 , wherein said each of the joint beams includes
a base thinner than said each of said two walls of the corresponding one of the intermediate metal layers, and
a protrusion arranged on at least one of an upper side or a lower side of the base of said each of the joint beams.

10. A loop heat pipe comprising:
a metal layer stack of two outermost metal layers and intermediate metal layers stacked between the two outermost metal layers, wherein
the metal layer stack includes
an evaporator that vaporizes a working fluid,
a condenser that liquefies the working fluid vaporized by the evaporator,
a vapor pipe connecting the evaporator to the condenser, and
a liquid pipe connecting the condenser to the evaporator,

the vapor pipe includes
two pipe walls defining a flow passage of the vapor pipe, and
joint beams arranged along the flow passage in positions that do not overlap with each other in a plan view, each of the joint beams being continuous with the two pipe walls and joining the two pipe walls to each other,

each of the intermediate metal layers includes two walls forming the two pipe walls of the vapor pipe and one of the joint beams, wherein the joint beams are arranged to be discontinuous, in said each of the intermediate metal layers, in a direction in which a vapor flows through the flow passage, and
said each of the joint beams is at least partially thinner than each of said two walls of a corresponding one of the intermediate metal layers.

Assignees

• Shinko Electric Ind Co

Inventors

• Machida Yoshihiro

Classifications

• H10W40/73

  for cooling by change of state · CPC title

• H10W40/258

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

• F28D15/0266 Primary

  with separate evaporating and condensing chambers connected by at least one conduit; Loop-type heat pipes; with multiple or common evaporating or condensing chambers (F28D15/043 takes precedence) · CPC title

• F28F3/086

  having one or more openings therein forming tubular heat-exchange passages · CPC title

• F28F21/089

  Coatings, claddings or bonding layers made from metals or metal alloys (F28F19/06 takes precedence) · CPC title