JPH03247994A - Sandwich panel having heat pipe function - Google Patents

Abstract

PURPOSE:To obtain a sandwich panel, in which operating fluid is circulated between parts having temperature difference, improved in heat conductive characteristics and easy in manufacturing, by a method wherein wicks are provided on the inner surface of a space formed of a core consisting of a sheet having recesses and protrusions and a face sheet while the operating fluid is sealed into the space. CONSTITUTION:A sandwich panel is provided with a corrugated core 1, face sheets 2, fixed to both surfaces of the core 1, a screen wick 4, formed by welding it to the inner surfaces of the face sheets 2 and the surface of said core 1, and operating fluid 3, sealed into a space formed between the face sheets 2 and the core 1. When there are high-temperature part and low-temperature part on the surface of the sandwich panel, the liquidous operating fluid in the screen wick 4 is evaporated in the high-temperature part while absorbing heat, then, the operating fluid 3 moves from the high-temperature part into the low- temperature part and is liquefied in the low-temperature part while dissipating heat, then, is absorbed into the screen wick 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sandwich panel having a heat pipe function, which is applied to mounting panels and radiators for electronic devices that require high thermal conductivity.

[Conventional technology]

As a conventional sand inch panel that does not have a heat pipe function, there is one in which a corrugated core 02 is sandwiched on both sides by face sheets o1, as shown in Figure 5, and as a sand inch panel that has a heat pipe function. As shown in FIG. 6, there is a heat vibrator 04 embedded in a sand inch panel of a honeycomb core 03, and as shown in FIG. 7, an internal Vcfll: moving fluid O7 is sealed.

In the case of a general sand inch panel, the heat conduction of the panel both in the direction 08 along the surface of the panel and in the direction o9 penetrating the panel shown in FIG. 5 follows the heat conduction characteristics of only the face sheet and core material. Heat conduction is not necessarily good, so if you want to use a sandwich panel as a panel for mounting electronic equipment on an artificial satellite and want to improve its unidirectional heat conduction characteristics, use Heat Vibe 04 as shown in Figure 6.
They used a book with a panel embedded in it.

In addition, if a device with improved multidirectional heat conduction is required, please refer to the U.S. document AIAA-83-1430"High
hCapacity Honeycomb Panel
)ieat Pipes for Space Rad
iators', AIAA-85-0978@Hor
+eycombpanel )leat Pipe l
) development for 5paceRad
As announced in IARORS', a sandwich panel itself has been devised to have the P5F541 function. This is done by welding the screen wink 06 to the face sheet 01 and the honeycomb core 03, providing holes 05 in the honeycomb core 03, and sealing the working fluid inside the sand inch panel, as shown in Figure WJ8. The entire sand inch panel was converted into a heat pipe.

[Problem to be solved by the invention]

Conventional solar panels with good multi-directional heat conduction require screen wink welding to the honeycomb core, which requires a lot of cost and know-how in manufacturing the honeycomb core.
It is also necessary to provide holes in the honeycomb core to ensure the flow of working fluid inside.
Furthermore, the working fluid is separated and vaporized and flows in the in-plane direction of the sand inch flannel, but it reaches the sonic speed limit in the holes in the nicum core and chokes, which poses problems in terms of heat transfer ability.

Furthermore, in a sand inch panel in which a heat pipe is embedded, heat conduction is partial and limited to one direction, and the weight of the heat pipe is added to the sand inch panel.

The present invention seeks to solve the above problems.

[Means to solve the problem]

The sandwich panel having a heat pipe function of the present invention has a core made of a plate with unevenness formed on its surface, and a flat face fixed to the surface of the core to form a space communicating with the same core. The present invention is characterized by comprising a seat, a groove provided on the surfaces of the core and face sheet forming the same space, and a working fluid sealed in the space.

[Effect]

In the above, when there is a high temperature part and a low temperature part on the surface of the sand inch panel of the present invention, the liquid working fluid in the wing evaporates while absorbing heat in the high temperature part, and the gaseous working fluid is more concentrated in the lower temperature part than in the high temperature part. It radiates heat and liquefies in the low-temperature part, and is absorbed into the wing. The working fluid absorbed into the screen wick in the low-temperature section moves again to the high-temperature section, absorbs heat, and evaporates, resulting in heat transport.

As a result of the above, the working fluid circulates between the parts of the sand inch panel where there is a temperature difference and facilitates heat conduction, making it possible to realize a sand inch panel that has improved heat conduction characteristics and is easy to manufacture.

〔Example〕

An embodiment of the present invention is shown in FIGS. 1 and 2.

The present embodiment shown in FIGS. 1 and 2 includes a core 1 formed into a two-dimensional waveform, a face sheet 2 fixed to both sides of the core 1, and welded to the inner surface of the face sheet 2 and the surface of the core 10. A screen wick 4 is formed, and a working fluid 4 is sealed in a space formed between the face sheet 2 and the core 1. In the above, when there is a high temperature part and a low temperature part on the surface of the sand inch panel of this embodiment, the liquid working fluid 4 in the screen wick 4 evaporates while absorbing heat in the high temperature part, and the gaseous working fluid 4 evaporates while absorbing heat. It moves from the high-temperature part to the low-temperature part, radiates heat in the low-temperature part, liquefies, and is absorbed into the screen wick 4. The working fluid 4 absorbed into the screen wick 4 in the low-temperature portion moves again to the high-temperature portion, absorbs heat, and evaporates, so that heat transport is performed.

As a result of the above, the working fluid circulates between all parts of the sand inch panel where there is a temperature difference, facilitating heat conduction between all parts, resulting in a sand inch panel that has improved heat conduction properties and is easy to manufacture. We were able to.

Another embodiment of the invention is shown in FIGS. 3 and 4.

In the present embodiment shown in FIGS. 3 and 4, the core 1 in the embodiment shown in FIGS. A screen wink 4 is formed on the inner surface of the space formed by the face sheet 2 and the core 5. In the case of the non-embodiment, the direction of heat transport is limited to one direction, but there is an advantage that the core can be easily formed and fixed.

〔Effect of the invention〕

The sandwich panel having a heat pipe function of the present invention has a wick on the inner surface of the space formed by the core and the face sheet, which are made of a plate with an uneven surface, and the working fluid is sealed in the space. Because the fluid circulates between parts of the sand inch panel that have different temperatures and facilitates heat conduction, we were able to realize a sand inch panel that has improved heat conduction properties and is easy to manufacture.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of one embodiment of the present invention, Fig. 2 is a detailed diagram of the N portion of Fig. 1, Fig. 3 is an explanatory diagram of another embodiment of the invention, and Fig. 4 is a diagram of Fig. 83. 5 is an explanatory diagram of a conventional sand inch panel without a heat pipe function, and FIG. 6 is a detailed diagram of a portion of the sand inch panel shown in FIG. 7 in which a conventional heat pipe is embedded. 1... Two-dimensional corrugated core, 2...-Face sheet, 3
... working fluid, 4...-screen wink, 5...
・One-dimensional waveform core.

Claims (1)

[Claims] A core made of a plate with unevenness formed on its surface, a flat face sheet that is fixed to the surface of the core and forms a space communicating with the core, and a surface of the core and face sheet that forms the space. 1. A sandwich panel having a heat pipe function, characterized by comprising a heat pipe provided in the space, and a working fluid sealed in the same space.