US 5,308,920 AGranted

Heat radiating device

AssigneeItoh Research & Development Laboratory Co., Ltd.

InventorSatomi Itoh

Life of this patent

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Abstract

A radiating device for radiating heat of an electronic component to the atmosphere, includes a container body, a cap for tight-sealing the inner space of the container body, and a working fluid serving as a heat carrier kept in the container body. The bottom wall of the container body is flat and serves as a heat receiving portion. The working fluid repeats evaporation and condensation in the container body. In a corner where the inner surface of the bottom wall of the container body meets the inner surface of a vertical cylindrical wall, a loop groove is formed running all along the corner. A plurality of horizontal grooves intersecting the loop groove are formed on the inner surface of the bottom wall. A plurality of second grooves intersecting the loop grooves are formed on the inner surface of the cylindrical wall. The working fluid condensed at the heat radiating portion returns to the bottom wall through the vertical grooves and through the loop groove. The working fluid which has returned is dispersed entirely over the inner surface of the bottom wall along the horizontal grooves.

Claims12

Dependent claims

A heat radiating device, comprising:

a container body having a flat bottom wall with a circular peripheral edge serving as a heat receiving portion and a cylindrical side wall extending upwardly from said circular peripheral edge of said bottom wall;
a cap arranged at an upper end portion of said cylindrical side wall for tight-sealing an inner space in said container body;
and a working fluid as a heat carrier kept in said inner space of said container body wherein evaporation and condensation are repeated;
and wherein said container body comprises a capillary loop groove formed in and along a corner portion where an inner surface of said bottom wall and an inner surface of said cylindrical side wall meet, a plurality of first capillary grooves formed on said inner surface of said bottom wall, said first capillary grooves intersecting said capillary loop groove, a plurality of second capillary grooves formed on said inner surface of said cylindrical side wall to also intersect said capillary loop groove, and wherein said capillary loop groove, said first capillary grooves and said second capillary grooves form fluid paths for said working fluid by capillary action.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/923,344Filed 31 Jul 1992
Granted: 3 May 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F28D 15/046
With tubes having a capillary structure: characterised by the material or the construction of the capillary structure
F28D 15/0233
In which the medium condenses and evaporates, e.g. heat pipes: the conduits having a particular shape, e.g. non-circular cross-section, annular
H10W 40/73
Fillings or auxiliary members in containers or in encapsulations for thermal protection or control: for cooling by change of state
F28D
Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange