JPH04366392A - Mounting structure for heat pipe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pipe mounting structure with good thermal conductivity. Heat pipes have come to be widely used as efficient heat conduction means in recent electronic devices and air-conditioning devices.

[0002] In electronic devices, heat generated from components mounted on a printed circuit board is efficiently transferred to outer radiation fins via heat pipes to suppress internal temperature rise.

[0003] Here, it is important to fix both ends of the heat pipe with good heat conduction.

0004

[Prior Art] Fig. 3 shows an example of a conventional printed board.
(a) is a cooling system configuration diagram, and (b) is a view of the heat pipe attachment section A in the direction of arrow A.

An example of a conventional printed board is shown in FIG. 3(a).
As shown in the figure, the heat conductor 85 of the heat generating component mounted on the printed board 9 and the heat dissipating fins 16 fixed to the edge and protruding outward are connected by a heat pipe 25 to efficiently transfer heat, and the inside is heated. It's cooling down.

The structure for attaching the end of the heat pipe 25 is as shown in FIG. Insert the end of the heat pipe 2, and from above
The heat pipe 25 is clamped and fixed by applying a holding metal fitting 7 having a U-shaped curved portion that touches the outer diameter of the heat pipe 5 and fixing the heat pipe 25 with screws on both sides.

[0007]

[Problem to be solved by the invention] However, ■
Since the outer diameter of the heat pipe 25 becomes more expensive if it is made highly accurate, a certain degree of variation is allowed. (2) Due to this difference in diameter, a gap is created partially between the groove 19 and the contact curved surface of the retainer 7, resulting in variations in heat transfer resistance, and in some cases, the desired cooling cannot be achieved. ■ Heat radiation fin 16
Heat is transferred to one side of the heat pipe 25 by direct contact, but the other half is transferred via the restraint fitting 7, which is correspondingly less efficient. There were other problems.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a simple mounting structure that is not affected by variations in the diameter of heat pipes, provides good heat transfer, and is not affected by variations in the diameter of heat pipes.

[0009]

[Means for Solving the Problems] The above object is as shown in FIGS. 1 and 2. [1] Two heat dissipation fin halves 11, 1 divided by a plane
2 or a cylindrical or semi-cylindrical groove 14 having a semi-circular cross-section, a semi-square cross-section, or a semi-isosceles triangular cross-section is provided on each of the dividing surfaces 13 of the heat-generating half body, and is fitted onto the end of the heat pipe 2. A thermally conductive rubber bushing 3 in the form of a square cylinder or an isosceles triangular cylinder is inserted into the groove 14, and the heat dissipation fin half body 11,
This is achieved by the heat pipe mounting structure of the present invention, which clamps and fixes the heat pipes in close contact with each other. [2] Also, a groove 15 having a square cross section or an isosceles triangular cross section is provided in the dividing surface 13 of either the heat radiation fin half body 11 or the heat conduction half body, and the rubber bush 3 fitted in the heat pipe 2 is inserted into the groove 15. The heat dissipation fin halves 11 and 12 are inserted into the
Alternatively, the heat pipe mounting structure of the present invention, in which the heat-generating conductive halves are clamped and fixed in close contact with each other, can also be applied. [3] Furthermore, this can also be achieved by the heat pipe mounting structure using the rubber bush 3 provided with one straight cut 31 extending from the surface to the inner hole.

0010

[Operation] That is, even if the outer diameter of the heat pipe 2 varies,
The externally fitted rubber bush 3 is elastically in close contact with the entire circumference, and no gap is created.

[0011] Also, this rubber bush 2 is inserted into grooves 14 and 15.
Since the heat dissipating fin halves 11 and 12 are clamped and fixed in close contact with each other, the rubber bush 2 is pressed from the periphery and is brought into close contact with the surfaces of the grooves 14 and 15 by elastic repulsive force without any gaps. At this time, even if the grooves 14 and 15 have a constant cross-sectional shape, variations in the diameter of the heat pipe 2 can be absorbed by the elasticity of the rubber bush 3.

Furthermore, for the end of the heat pipe 2, 2
Since the heat dissipating fin halves 11 and 12 sandwich each half of the circumference, heat is directly transferred over the entire circumference, increasing efficiency. Here, the shape of the groove, which is sandwiched between two opposing halves and receives pressure over substantially the entire circumference with the heat pipe 2 disposed at the core, is preferably a cylinder, a square prism, or an isosceles triangular prism. The average value of the radial heat transfer path from the entire circumference of the heat pipe 2 should be the shortest, and since it can be divided in half and clamped, it is possible to use ellipsoids, ellipses, rectangles, rhombuses, and scalene shapes in cross section. Triangles are not acceptable, and the pillars have the various shapes mentioned above. In addition, the circular shape can be omitted to create a shape that can be held even if divided along one side of the outer periphery.

[0013] When fitting the rubber bush 3 onto the heat pipe 2, it is difficult to work because the rubber bush 3 is in close elastic contact with the heat pipe 2. To improve this, a notch 31 is provided and the heat pipe 2 is inserted by opening the notch 31. Easy to fit. At this time, since the rubber bush 3 is made of rubber, the notch 31 can be easily opened wide.

[0014] Thus, it is possible to provide a simple mounting structure with good heat transfer without being affected by variations in the diameter of the heat pipe.

[0015]

EXAMPLES The present invention will be specifically explained below with reference to examples shown in the drawings. The same reference numerals indicate the same objects throughout the figures. Figure 1 shows an embodiment of the present invention, (a) is a configuration diagram of a cooling system for a printed board, (b) is a view of the mounting part in the direction of arrow A, and (c)
) shows a configuration diagram of the mounting part, and FIG. 2 shows a view of various mounting parts in the direction of arrow A in another embodiment of the present invention.

[0016] In this embodiment, a printed board, which is a handling circuit unit that is mounted in large numbers in an electronic device, is cooled using a cooling method in which internal heat is transmitted to an external heat sink using a heat pipe.

In one embodiment, as shown in FIG. 1(a), components are mounted on a printed board 9 to form a circuit.
If heat is generated that requires cooling, the heat is absorbed by the heat generating conductor 8 made of a metal block, one end of the heat pipe 2 is attached to the heat generating conductor 8, and the other end extending to the edge of the printed board 9 is connected to the edge. It is attached to a heat radiation fin 1 which is fixed to and radiates heat to the outside.

As shown in FIG. 1(c), this mounting structure is made of a thermally conductive silicon rubber material and has a straight line extending from the surface to the inner hole at the end of the 6 mm diameter heat pipe 2. Outer diameter 8 x length 10 mm with notch 31
A cylindrical rubber bush 3 is fitted onto the outside. The radiation fin 1 has a flat divided surface 13 and is divided into two radiation fin halves 11,
A groove 14 having a semicircular cross section of 7.5φ x 13 mm in length and having a cross section slightly smaller than the outer diameter of the rubber bush 3 faces the dividing surface 13 and is divided into 12 parts and can be tightly fixed together with a fixing screw 17. is provided. If the rubber bush 3 that was fitted onto the heat pipe 2 is inserted into this groove 14 and the heat dissipation fin halves 11 and 12 are tightly fixed together, the result shown in FIG.
As shown in (b), the heat pipe 2 is held between the rubber bushes 3 and is pressed and fixed due to the elasticity of the rubber bushes 3, and the rubber bushes 3 fill the grooves 14 without any gaps. A good heat transfer state from the heat pipe 2 to the radiation fins 1 can be easily and stably maintained.

The above description has been about the mounting structure on the side of the radiation fin 1, but the same process is performed on the side of the heat generating conductor 8 at the other end. Further, the cross-sectional shapes of the rubber bush 3 and the grooves 14 held therebetween are not limited to circular shapes, and various shapes can be implemented, and various other embodiments are shown in FIG. 2.

FIG. 2 is almost the same as FIG. 1(a), and only the A arrow direction view shown in FIG. 1(b) shows the various types in (a).
~ (e) Shown. (a) to (c) are center divisions, and (d) to (e) are division planes with one side of the outer shape as the dividing surface. In this case, the groove 15 is provided only on one of the divided halves. It can be held with a chisel. (a), (b), and (d) are square cross sections, and (c) and (e) are equilateral triangular cross sections.

The above embodiment is merely an example, and the shapes, dimensions, and materials of each member are not limited to those described above.

[0022]

As described above, the heat pipe mounting structure of the present invention provides a simple mounting structure that is not affected by variations in the diameter of the heat pipe, has good heat transfer, and has great practical effects.

[Brief explanation of the drawing]

[Fig. 1] One embodiment of the present invention (a) Configuration diagram of a cooling system for a printed board (b) View from arrow A of the mounting part (c) Configuration diagram of the mounting part

[Fig. 2] View from arrow A of various attachment parts of other embodiments of the present invention

[Figure 3] Cooling system configuration diagram (a) of a conventional printed board (a)
b) Heat pipe installation part A view

[Explanation of symbols]

1,16 Heat radiation fin 2,25
Heat pipe 3 Rubber bush 7 Holding metal fitting 8,85
Heat generating conductor 9 Printed board 11, 12 Heat radiation fin half 13
Dividing plane 14, 15, 19
groove

Claims (3)

[Claims] Claim 1: Each of the two heat-radiating fin halves (11, 12) divided by a plane or the dividing surface (13) of the heat-generating conductor half has a semi-circular cross-section, a semi-square cross-section, or a semi-isosceles. A groove (14) with a triangular cross section is provided, and a thermally conductive rubber bushing (3) in the form of a cylinder, a square cylinder, or an isosceles triangular cylinder is fitted onto the end of the heat pipe (2). ) and insert the heat dissipation fin halves (11, 12)
A heat pipe mounting structure characterized by closely clamping and fixing the heat pipes. [Claim 2] Either one of the heat dissipation fin halves (11)
2. The heat pipe mounting structure according to claim 1, wherein a groove (15) having a square cross section or an isosceles triangular cross section is provided on the dividing surface (13) of the heat conduction half. 3. The heat pipe mounting structure according to claim 1, wherein the rubber bush (3) is provided with one straight cut (31) extending from the surface to the inner hole.