Loop heat pipe evaporator with dual top vapor outlets

Patent metadata

Field	Value
Publication number	US-12085345-B2
Application number	US-201917418251-A
Country	US
Kind code	B2
Filing date	Dec 24, 2019
Priority date	Dec 27, 2018
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

An evaporator includes: a housing having a plurality of surfaces including a front surface and a back surface, at least one of the front and back surfaces having the largest area among the plurality of surfaces; and a heat-absorbing element disposed on at least one of the front and back surfaces and thermally connected to a heat source. The housing includes: at least one working fluid inlet located in a surface of the housing, the surface being other than a top surface of the housing; and at least one pair of working fluid outlets located respectively in opposite longitudinal end portions of the top surface.

First claim

The invention claimed is:

1. An evaporator that evaporates at least a part of a working fluid by heat absorbed from a heat source, comprising:
a housing having a plurality of surfaces including a front surface facing laterally and a top surface facing upward, and storing the working fluid; and
a heat absorber disposed on the front surface, including radiating fins projecting into the housing, and being thermally connected to the heat source, the heat absorber absorbs heat from the heat source and releases it to the working fluid through the radiating fins,
wherein:
the housing includes: at least one working fluid inlet located in a surface of the housing, the surface being other than the top surface of the housing; and at least one pair of working fluid outlets located respectively in opposite longitudinal end portions of the top surface,
when the top surface of the housing is positioned horizontally, a boundary plane at which a volume ratio of gas in two-phase flow is 50% is located below the working fluid outlets and above the heat absorber,
the top surface of the housing is quadrilateral, and the working fluid outlets are located at diagonally opposite corners of the top surface of the housing, and
one of the working fluid outlets is closer to the front face of the housing than another of the working fluid outlets.

2. The evaporator according to claim 1 , wherein:
the working fluid outlets include a first working fluid outlet to which a first vapor conduit is connected and a second working fluid outlet to which a second vapor conduit is connected, and
when the housing is placed on a horizontal surface, the first and second vapor conduits join each other at a junction located between a first vertical line passing through a center of an opening of the first working fluid outlet and a second vertical line passing through a center of an opening of the second working fluid outlet.

3. A loop heat pipe comprising:
an evaporator that changes at least a part of a working fluid from a liquid phase into a gas phase, the evaporator being according to claim 1 ;
a condenser that changes the working fluid from the gas phase into the liquid phase;
a vapor conduit connecting the working fluid outlet of the evaporator and an inlet of the condenser; and
a liquid conduit connecting an outlet of the condenser and the working fluid inlet of the evaporator.

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Haruki Yu
• Sakagawa Keiji
• Hakamada Kazuhide
• Mitani Ryosuke

Classifications

• H10W40/73

  for cooling by change of state · CPC title

• F28D2015/0216

  having particular orientation, e.g. slanted, or being orientation-independent · CPC title

• F28D15/025

  having non-capillary condensate return means · 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

• H05K7/20309

  Evaporators · CPC title