JPS5953478B2 - flexible heat pipe panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat pipe for use at relatively low temperatures, which is low cost, has multiple functions, and is intended to compensate for the shortcomings of conventional flexible heat pipes.

Three-dimensional molding in which a thin semi-cylindrical cylinder and a thick semi-cylindrical cylinder with axial wave-like undulations on the circumference are formed in large numbers at regular intervals on a plate made of a material suitable for heat pipes, with concave parts connected on the same axis. The corrugated board (Figure 1) consists of the following parts:

The sealed container part C is a part that has been drawn and embossed to form a concave part with undulating waves, and the wick part W has a radius naturally formed at the edge of a three-dimensional corrugated board and grooves to strengthen capillary action. Molding processing of the edge part, netting,
When fibers, sintered metal, thermal spraying, etc. are applied and combined in plane symmetry, the part that becomes the wick, the degassing pipe insertion part n is the neck for attaching the degassing pipe, and the rib part r is the three-dimensional molded corrugate board, When the two pieces are combined, it becomes the part that is joined by seam welding, etc. At the same time, while maintaining flexibility, the displacement in the axial direction (
The part that suppresses expansion and contraction, and the above parts are integrally molded using a press and roll.

In its simple form, a heat pipe is an excellent heat transport device, in which heat transport between a heating part and a cooling part is carried out by transporting a working fluid with a change of state between a gas phase and a liquid phase.

A type of heat pipe that uses capillary pressure for reflux of a working fluid has the following functional parts.

(1) Closed container: A pressure vessel that ensures optimal conditions for the working fluid, which is a heat medium. (2) Working fluid: A heat medium that flows with changes in the state of liquid and gas phases. (3) Wick: Under the influence of gravity due to capillary action. (4) Vapor space: Space where vaporization of the working liquid, steam passage, condensation, change in state of the working liquid, and transport take place (5) Degassing and sealing of the working liquid Port: A part that exhausts unnecessary gas, fills in a fixed amount of operating fluid, and seals it completely airtight.

The invention No. 1 is a three-dimensionally formed corrugated board, two sheets are set as a set,
They are assembled symmetrically so that a hollow part is created, as shown in Figures 2 and 3.
is an explanatory diagram, and according to the configuration of the functional parts mentioned above, (1) The sealed container C is made of a three-dimensional corrugated plate (Fig. 1) made of stainless steel, copper, aluminum plate, etc., and is symmetrical in plane to create a hollow part. (2) The operating liquid is Freon, water, methanol, acetone, etc., selected depending on the material of the airtight container and the operating temperature.
3) Wick W is the part where the wick is formed when three-dimensionally formed corrugate plates are combined with each other. (4) Steam space S
The internal space of a sealed container with corrugated undulations is usually considered to be a space disadvantageous due to the pressure loss of steam flow, but since the corrugated undulation space does not necessarily involve a change in cross-sectional area, In applications where the flow rate is low, a vapor space that does not cause turbulence and can keep pressure loss low (5)
The sealing port for degassing and sealing in the working fluid is a degassing pipe N inserted into the n section of the three-dimensionally molded corrugated board.

The effects of the present invention having the above-mentioned configuration are: 1) In a heat pipe using a simple bellows pipe, the operating steam pressure changes and expands and contracts during operation and rest; however, the proposed heat pipe expands and contracts due to the rib portion R. ■ Heat pipes that use bellows tubes have a meandering working liquid flow path using capillary tubes, making the flow path longer, increasing resistance and weakening the return force, so we recommend using a wire mesh tube, etc. However, this is disadvantageous in terms of flexibility, turbulence of the vapor space occurs after bending, and disadvantageous in terms of processing cost.However, in the proposed method, the wick part moves straight in the plane of the neutral axis. Therefore, the flow path is short and flexibility is maintained, which is advantageous in terms of processing cost.

■In general heat pipes that use straight pipes, forming a wick is one of the difficult processes, especially for thin and long heat pipes, but in this proposal, the wick part is made of three-dimensionally formed corrugate plate. The processing can be performed in an open state, so even if the capillary action strengthening process is performed at the same time as the molding of the three-dimensional corrugated board and integrally molded, the next process can easily include inserting wire mesh, thermal spraying, etc. ■Many Processing costs are low because presses, rolls, and seam welding, which are excellent for mass production, can be used to form the plates that are the material for the heat pipes. ■Dividing a straight pipe into two A heat pipe with a laminated tube made of molded plates has also been proposed, but since the undulating sealed container of this proposal is mechanically considered to be a composite of a spherical shell structure, it is less sensitive to internal and external pressure than the former. ■The bending rigidity that impedes flexibility is proportional to the moment of inertia of the cross section that acts as the fourth power of the distance from the neutral axis when the cross section is circular, so the heat pipe proposed in this proposal has the rib portion R near the neutral axis. The panel is flexible; for example, when bent into a cylindrical shape, each heat pipe can be bent horizontally or arranged vertically and bent into a cylindrical shape, and has biaxial flexibility.0 The proposed flexible heat pipe panel is an assembly of many heat pipes, so it can be divided in the middle of the rib portion R and used as a single unit.Fins are generally attached because it is necessary to expand the heat transfer surface. Similarly, in this proposal, the fins can be attached from the axial direction, and the heat transfer surface is not simply expanded.

The pressure resistance of the proposed heat pipe is very weak compared to that of a general heat pipe using a straight pipe, but by attaching fins, the pressure resistance will be improved by placing the burden on the fins.

There are effects as described above. The second invention is made by combining a three-dimensionally molded corrugated plate (FIG. 1) and a flat plate p, and its explanatory diagrams are shown in FIGS. 4 and 5.

(1) The closed container C is made by joining the concave part of the closed container part C of the three-dimensionally molded corrugated board and the flat plate P. (2) The operating liquid is Freon, water, etc. (3) The wick W is made of the three-dimensionally molded corrugated board. Create a capillary action in the gap created inside when the flat plates P are combined. (4) The steam space S is
Semi-cylindrical space with corrugated undulations in closed container C (5) Deaeration pipe N is the sealing port for deaeration and sealing of working fluid.

The effects of invention 2 above are similar to the effects ① to ① above, but there is a drawback that the vapor space is halved compared to invention 1, but when exchanging heat with a fluid containing solids, the fluid This has the effect of reducing pressure loss.

FIG. 6 shows an embodiment in which the heat pipe is laid on its side and curved so as to be wound in the circumferential direction.

As mentioned above, many functions and low costs are planned, and it can be used for various heat dissipation, soaking 1, heat exchange plates and constant temperature baths, cultivation tanks, construction materials such as walls, mats, solar heat collecting plates, etc., and agriculture. It is expected to have a variety of uses including materials, foods, and fermentation industrial materials.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a three-dimensional molded corrugate plate, FIGS. 2 and 3 are explanatory diagrams of the invention 1, FIGS. 4 and 5 are diagrams illustrative of the invention 2, and FIG. 6 is an embodiment. Part symbol of three-dimensional molded corrugate board, C: Closed container part, W
: Wick part, n: Deaeration pipe insertion part, r: Rib part. Symbols of flexible heat pipe panels, C: closed container, L:
Working liquid, W: wick, S: steam space, N: deaeration pipe, R: rib portion, p: flat plate.

Claims (1)

[Scope of Claims] 1. A thin semi-cylinder and a thick semi-cylinder having wave-shaped undulations in the axial direction on the circumference are connected on the same axis, and a number of recesses are formed at regular intervals on a plate made of a material suitable for a heat pipe. Two three-dimensionally molded corrugated boards are assembled as a set and are combined symmetrically so that a hollow part is created. A wick is formed in the gap created on the hollow part side of the combined contact surface, and a deaeration pipe is installed at the end. A flexible heat pipe panel in which the heat pipes are inserted into each other, joined airtightly by welding except for the holes in the degassing pipes, unnecessary gas is degassed through the degassing pipes, a fixed amount of operating fluid is filled, and the panels are sealed. 2 Three-dimensional molding in which a thin semi-cylinder and a thick half-cylinder with axial wave-shaped undulations on the circumference are formed in large numbers at regular intervals on a plate made of a material suitable for heat pipes, with concave parts connected on the same axis. Combine flat plates of the same size as the corrugated plates to create an open space, form a wick in the gap created on the hollow side of the combined contact surface, insert a deaeration pipe into each end, and weld. Connect airtightly except for the hole in the degassing pipe, remove unnecessary gas from the degassing pipe, and fill in a fixed amount of working fluid.
Sealed flexible heat pipe panel.