JPH023300A - Heat pipe mounting structure - Google Patents

Abstract

PURPOSE:To make it possible to elevate heat transmission efficiency between a block and a heat pipe by so providing a plane part as to contact closely with the outside of a bush made of shape remembering alloy contacted closely with the periphery of a heat pipe. CONSTITUTION:The cylinder part of the bush 19 made of shape remembering alloy is made to memorize the shape having the inside radius R3 smaller than the radius R1 of the periphery of a heat pipe 16 in advance, and then it is deformed into the shape having the inside radius R3' larger than the radius R1 of the periphery of the heat pipe 16, and in this condition the heat pipe 16 is inserted into the bush 19. Hereafter, the bush 19 is returned to the memorized former shape by being heated, for example, above 80-90 deg.C, and the inner face of the cylinder part of the bush 19 is in close contact with the periphery of the heat pipe 16. Thereafter, lug pieces 19a are held and fixed in the condition that the planes are in close contact with blocks 13 and 14 by fastening of screws. Hereby, it is can elevate the transmission efficiency of the heat form the blocks 13 and 14 to the bush 19 and from the bush 19 to the heat pipe 16.

Description

[Detailed Description of the Invention] [Summary] Regarding a heat pipe mounting structure that includes a block that is thermally connected to a heat generating component and a heat pipe that is attached to the block, the efficiency of heat transfer from the block to the heat pipe is In order to provide a mounting structure for a heat pipe that can increase the heat pipe, a flat part is provided on the outside of a bushing made of a shape memory alloy that is tightly attached to the outer periphery of the heat pipe due to the shape memory effect, and the flat part is attached to the above block. The structure is such that it is in close contact with the

[Industrial application field]

The present invention relates to a heat pipe mounting structure for guiding heat generated from components of a communication device to the outside of the device. Regarding measures to increase

[Conventional technology]

FIGS. 5 and 6 show a conventional heat pipe mounting structure. Referring to these figures, one of a pair of blocks 3 and 4 is screwed onto a printed wiring board 1 on which a heat generating component 2 such as an integrated circuit is mounted so as to be in contact with the heat generating component 2. , 4, one end of the heat pipe 5 is fastened and fixed in the grooves 3a, 4a. The other end of the heat pipe 5 is connected to a radiation fin 7 disposed outside the printed wiring board 1, for example, outside a shelf 6 housing the printed wiring board 1.

[Problem to be solved by the invention]

As mentioned above, the heat pipe 5 is connected to a pair of blocks 3.
The semi-cylindrical attachment formed in 4 is groove 4a.

However, when installing the blocks 4 and 5, it is almost impossible to completely match the radius R2 of the grooves 4a and 5a with the radius R1 of the outer peripheral surface of the heat pipe 3 due to processing accuracy. In practice, as shown in FIG.
The radius R2 of the grooves 4a and 5a is larger (R2>R1) or smaller (R2<R1) than the radius R+ of the heat pipe 3, so there is no space between the block 3.4 and the heat pipe 5. The reality is that a gap occurs due to the difference in radius R2 and R1.

Therefore, the heat generated from the heat generating component 2 is transferred to the blocks 3 and 4.
When the heat is transferred from the blocks 3, 4 to the heat pipe 5, the contact area between the blocks 3, 4 and the heat pipe 5 is small, so that the heat is transferred from the blocks 3, 4 to the heat pipe 5. The problem was that the efficiency was low.

Therefore, an object of the present invention is to provide a heat pipe mounting structure that can increase the heat transfer efficiency between a block that is thermally connected to a heat generating component and a heat pipe that is attached to the block. .

[Means to solve the problem]

In order to achieve the above object, the present invention provides a heat pipe mounting structure including a block thermally connected to a heat generating component and a heat pipe attached to the block.
A flat part is provided on the outside of a bush made of a shape memory alloy that is brought into close contact with the outer periphery of the heat pipe due to the shape memory effect, and the flat part is brought into close contact with the block.

[For production]

In the heat pipe mounting structure having the above configuration, the shape memory alloy bushing is memorized in advance to have a shape having an inner radius smaller than the radius of the outer circumferential surface of the heat pipe, and then a shape having an inner radius larger than the outer circumferential radius of the heat pipe is memorized in advance. A heat pipe is inserted into the bushing by deforming it into a shape having an inner radius. Thereafter, the inner surface of the bushing is brought into close contact with the outer circumferential surface of the heat pipe by heating the bushing to a predetermined temperature or higher to return the bushing to its original shape stored in advance. Thereafter, the bushing remains in close contact with the heat pipe unless it is deformed again. In this way, the bushing can be brought into close contact with the outer circumferential surface of the heat pipe, thereby increasing the efficiency of heat transfer from the bushing to the heat pipe.

On the other hand, since the flat part provided on the outside of the bushing is in close contact with the block that is thermally connected to the heat generating component, a wide contact area can be ensured between the block and the flat part of the bushing. Therefore, the efficiency of heat transfer from the block to the bushing can be increased. Therefore, it becomes possible to efficiently transfer the heat generated from the heat generating component to the heat pipe.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 4 show an embodiment of the present invention. First, referring to FIGS. 1 and 2, on a printed wiring board 11 on which a heat generating component 12 such as an integrated circuit is mounted, there are a plurality of blocks 13 and 14 such that one of the blocks 13 and 14 is in contact with the heat generating component 12. It is tightened and fixed with screws 15.

One end of the heat pipe 16 is attached between the blocks 3 and 4, and the other end of the heat pipe 16 is connected to a heat radiator such as a heat radiator fin 18 disposed outside the shelf 17 or the like.

According to the present invention, one end side of the heat pipe 16 is connected to a pair of blocks 13, 14 via a shape memory alloy bushing 19 having a pair of plate-like lug portions 19a as flat portions.
installed in between.

Referring to FIGS. 3 and 4, as shown in FIG. 4(a), the cylindrical portion of the bushing 19 made of a shape memory alloy has a radius R of the outer peripheral surface of the heat vibrator 16 in advance.

A shape having an inner radius R3 (R3<R1) smaller than that shown in FIG. 3 is memorized by molding and heat treatment, and then, as shown in FIG. It is deformed into a shape having an inner radius R3 (R3'> R+) larger than the radius R1 of the surface. After the heat vibrator 16 is inserted into the bushing 19 in this state, the bushing 19 is heated to a required temperature of 80 to 90, for example.
By being heated above .degree. C., the bushing 19 is returned to its original, pre-memorized shape. As a result, Pushshi 51
The inner surface of the cylindrical portion 9 is brought into close contact with the outer circumferential surface of the heat vibrator 16 . Thereafter, the bushing 19 remains in close contact with the heat vibrator 16 unless it is deformed again.

After the bushing 19 is tightly fixed to the outer peripheral surface of the heat vibrator 16 in this way, the ear piece 19a of the bushing 19 is
is placed between the pair of blocks 13 and 14, and by tightening the screw 15, the ear piece 19a is clamped and fixed to the block 13 and 14 in a flat and close contact state. Block 13
．． 14 is formed with approximately semi-cylindrical grooves 13a and 14a for receiving the cylindrical portion of the bushing 19, respectively, but the inner surfaces of these grooves 13a and 14a do not necessarily come into contact with the outer peripheral surface of the cylindrical portion of the bushing 19. As shown in the figure, even if there is a gap between the grooves 13a, 14a and the cylindrical portion of the bushing 19, the connection between the block 13.14 and the cylindrical portion of the bushing 19 via the lug portion 19a. It is possible to secure a heat transfer path between the two.

As described above, the cylindrical portion of the pusher 519 made of a shape memory alloy can be reliably brought into close contact with the heat vibrator 16 due to its shape memory effect, thereby increasing the efficiency of heat transfer from the pusher 19 to the heat vibe 16. be able to. On the other hand, since a wide contact area can be secured between the ear piece 20 of the bushing 19 and the pair of blocks 13.14 that are thermally connected to the heat generating component 12, the contact area between the pair of blocks 13.14 and the bushing can be 19 heat transfer efficiency can be increased. Therefore, it becomes possible to efficiently transfer the heat generated from the heat generating component 12 to the heat vibrator 16.

Although the illustrated embodiments have been described above, the present invention is not limited to the embodiments described above.

For example, in the above embodiment, the ear pieces are provided on both sides of the shape memory alloy bushing, but the shape memory alloy bushing is provided with a single ear piece as a flat part. The ear pieces may be configured to be brought into close contact with a single block or a pair of blocks. In this case, there is no need to form a substantially semi-cylindrical groove in the block. In addition, by memory-forming the outer contour of the cross section of the shape-memory alloy bushing into a rectangular shape, or by memory-forming it into a substantially cylindrical shape having two flat surfaces facing each other in the diametrical direction,
The outer flat portion of the bushing itself can be used to tightly fit the block to a single block or to a pair of blocks. In this case, there is no need to form protruding ear pieces on the bushing.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the shape memory alloy bushing can be brought into close contact with the outer circumferential surface of the heat vibrator due to its shape memory effect, so that the efficiency of heat transfer from the bush to the heat vibe is improved. can be increased. On the other hand, since the flat portion provided on the outside of the bushing is brought into close contact with the block that is thermally connected to the heat generating component, a wide contact area can be ensured between the block and the flat portion of the bushing. Therefore, the efficiency of heat transfer from the block to the bushing can be increased. Therefore, it is possible to provide a heat vibrator mounting structure that can efficiently transfer the heat generated from the heat generating component to the heat vibrator.

[Brief explanation of the drawing]

FIG. 1 is an end view of a heat vibrator mounting structure showing an embodiment of the present invention, FIG. 2 is a side view of a heat vibrator mounting structure shown in FIG. 4(a) and 4(b) are perspective views showing the memorized shape of the shape memory alloy bushing used in the heat pipe mounting structure and the state in which the diameter is expanded and deformed thereafter, respectively. , Fig. 5 is an end view of a conventional heat pipe mounting structure, Fig. 6 is a side view of the conventional structure shown in Fig. 5, and Fig. 7 is an end view of a conventional heat pipe mounting structure.
FIG. 2 is an enlarged sectional view of a main part of the conventional structure shown in the figure. In the figure, 12 is a heat generating component, 13.14 is a block,
16 is a heat pipe, 19 is a shape memory alloy bushing,
Reference numeral 19a indicates an ear piece portion as a plane portion. Enlarged sectional view of essential parts of an embodiment of the present invention Fig. 3 (α) (b) Fig. 2 End view of an embodiment of the present invention Fig. 1112 Side view of an embodiment of the present invention Fig. 2 16... End view of conventional heat pipe structure Fig. 5 Side view of conventional structure

Claims (1)

[Claims] 1. A block (1) thermally connected to a heat generating component (12)
3, 14) and a heat pipe (16) attached to the block, the bush (19) made of a shape memory alloy is brought into close contact with the outer periphery of the heat pipe (16) due to the shape memory effect. A heat pipe mounting structure characterized in that a flat part (19a) is provided on the outside of the heat pipe, and the flat part (19a) is brought into close contact with the blocks (13, 14).