JP3172138B2 - Heating element cooling structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a heating element.

[0002]

2. Description of the Related Art FIG. 16 shows a conventional example of cooling a heating element. In this conventional example, a radiator 9 made of a material having good thermal conductivity such as aluminum is fixed on the heating element 1. The radiator 9 is provided with a plurality of comb-shaped radiating fins 8, 8,... On the upper surface, and the heat generated from the heating element 1 is absorbed by the cooling air after being transferred to the radiator.

[0003]

However, in the above-described conventional example, as the amount of heat generated by the heating element 1 increases, it is necessary to increase the wind speed near the heating element 1 in order to increase the heat radiation effect. Requires the use of more powerful fans.

On the other hand, in order to strengthen the fan, it is common to increase the size of the fan or increase the number of revolutions, which results in an increase in the space for mounting the fan and an increase in noise. It had disadvantages.

Although it is possible to increase the surface area of the heat radiation fins 8 in order to improve the heat radiation effect, in this case, there is a disadvantage that the mounting space is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to provide a cooling structure for a heating element capable of effectively cooling the heating element without hindering the mounting efficiency. And

[0007]

According to the present invention, a heating element is provided.
Radiator with fan device 3 mounted on its upper surface adjacent to child 1
9 is implemented. Heat radiator 9 and heating element 1 are heat pipes
10 is connected through the heat generating element 1,
The heat is transmitted to the radiator 9 via the heat pipe 10.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 show a first embodiment of the present invention. In the drawing, reference numeral 1 denotes a heating element mounted on a printed circuit board, and a shielding plate 2 is disposed above the heating element.

In this embodiment, the shielding plate 2 is formed by fixing the cover member 11 to the heating element 1, and the upper surface of the shielding plate 2 is arranged so that the outlet is aligned with the blow opening formed at an appropriate position. The fan device 3 is mounted.

The fan device 3 is formed by housing a blower fan in a case 12 and is attached to the cover member 11 by screwing the four corners of the case 12 to enable replacement in case of failure. Is done.

The cooling air sent from the fan is shown in FIG.
The fan device 3 is provided eccentrically with respect to the center of the heating element 1 such that the fan blades 14 are located directly above the high heating section 13 so as to directly blow the high heating section 13 of the heating element 1 indicated by a broken line in FIG. Can be

A cover member 1 for supporting the fan device 3
1 is formed by bending an injection-molded product or a sheet metal made of a synthetic resin material. When the fan device 3 is eccentric, the edge on the side closer to the edge of the fan device 3 is approximately 2/3. The partition 5 is bent over the period.

The cover member 11 on which the fan device 3 is mounted has a fixing piece 15 (see FIG. 1) formed by bending the lower end edge of the partition wall 5 inward, and The auxiliary column 16 provided at the diagonal position is fixed on the heating element 1 by bonding to the upper surface of the heating element 1. In this state, the heating element 1 and the cover plate 2 of the cover member 11 are fixed.
A part of the edge is shielded by the partition wall 5, and the gap 4 is formed with the remaining edge being the exhaust port 17.

Therefore, in this embodiment, when the cooling air is blown toward the gap 4 by driving the fan device 3, the cooling air blows down toward the upper surface of the heating element 1 and
After cooling, the gas flows out from the exhaust port 17 to the outside. At this time, the partition walls 5 form the gaps 4 while the cooling air does not contribute to cooling.
From being immediately released to the outside from the
Functions so as to reflect the cooling air that has collided with the heating element 1 and is reflected again to the heating element 1 side, thereby contributing to an improvement in cooling efficiency.

In this embodiment, the fan device 3
The fan device 3 is provided at an eccentric position with respect to the center of the heating element 1 so that the cooling air from the blower blows directly to the high heat generating portion 13 of the heating element 1. If the cooling air volume can be supplied, the fan device 3 can be arranged at the center of the heating element 1.
In this case, so that the cooling air passes through the entirety of the cavity 4,
It is desirable to provide a partition wall 5 at the periphery.

FIG. 3 shows a second embodiment of the present invention. In the description of the following embodiments, the same components as those in the above-described embodiments are denoted by the same reference numerals in the drawings, and description thereof will be omitted. The cover member 11 according to this embodiment is formed of a material having good thermal conductivity such as a sheet metal, and the spring member 6 is fixed to an appropriate position on the back surface of the shielding plate 2. Spring member 6
Is made of a material having good thermal conductivity such as phosphor bronze and abundant spring properties, and its free height is defined by the gap 4.
Is slightly higher than the height.

Therefore, in this embodiment, when the cover member 11 is mounted on the heating element 1, the spring member 6 is elastically deformed and its free end is pressed against the upper surface of the heating element 1, and the spring member 6 is moved from the heating element 1 to the spring member 6. Cover member 1 via
A heat path leading to 1 is formed. As a result, the heating element 1
In addition, the cooling by the heat path is performed in addition to the cooling by the cooling air from the fan device 3, and the cooling efficiency is further improved.

In this case, the spring member 6 is desirably provided close to the center of the heat generating element 1 in order to improve the heat transfer in the central part of the heat generating element 1, that is, in the high heat generating portion 13.

FIG. 4 shows a third embodiment of the present invention. The shielding plate 2 according to this embodiment is provided with a plurality of ridges 7, 7... These ridges 7 increase the wind speed of the cooling air by narrowing the cooling air passing through the gaps 4 and, as shown in FIG. It is provided for directing, and is arranged along the edge of the fan device 3.

Next, a fourth embodiment of the present invention is shown in FIG. In this embodiment, a radiator 9 is attached to the heating element 1. A plurality of pin-shaped radiating fins 8, 8,... Are provided on the upper surface of the radiator 9, and the fan device 3 is mounted thereon.

Two fan devices 3 are mounted at the center of the heat generating element 1, that is, at a diagonal position with respect to the high heat generating portion 13, and with the high heat generating portion 13 so that the fan blades 14 of the fan are applied. It is driven to rotate in the opposite direction.

Therefore, in this embodiment, as shown by arrows in FIG. 5A, the cooling air blown from the two fan devices 3 joins in the high heat generating portion 13 to increase the amount of air. As shown in FIG. 6, an L-shaped wall 18 in plan view corresponding to the edge of the fan device 3 is formed at the opposite corner of the radiator 9, and the cooling air contributes to cooling. This prevents the heat radiator 9 from being immediately discharged to the outside.

FIG. 5 shows a case where the fan devices 3 are arranged at diagonal positions. In addition, as shown in FIG. 7, two fan devices 3 are arranged on the center line of the heating element 1. , 3 can be arranged side by side, and the number of fan devices 3 is not limited to two, but may be three or four or more as shown in FIG. In any case, each fan device 3 is driven such that the cooling air gathers at the center of the heating element 1 as indicated by an arrow in the figure, and the radiator 9 cools the cooling air. A wall surface 18 is provided as appropriate to prevent the radiator 9 from being immediately discharged to the outside without contributing to the heat radiation.

FIGS. 9 and 10 show a fifth embodiment of the present invention. This embodiment is a modification aimed at lowering the mounting height. The radiator 9 is fixed to the printed circuit board 19 adjacent to the heating element 1, and the space between the radiator 9 and the heating element 1 is fixed. A heat pipe 10 is erected.

The heat pipe 10 is formed by sealing a working fluid such as chlorofluorocarbon in a copper pipe, and one end of the heat pipe 9
, The other end is fixed to the heating element 1. The heat pipe 10 is directly hit by the cooling air from the fan device 3, and the heat generating element 1 has a high heat generating portion 1
3 is formed in a fork shape in plan view that branches off on the radiator 9 side so as to be able to cool the upper part. The radiator 9 has a pin-shaped The fitting space 20 where the cooling fin is not provided is formed.

On the other hand, on the side of the heating element 1, a base plate 21 a fixed to the upper surface of the heating element 1 using, for example, an adhesive having good thermal conductivity, and the base plate 21 a
Is mounted by being clamped by a fixing plate 21b screwed to the fixing member 21b.

With this configuration, when the heat generating element 1 generates heat, the working fluid in the heat pipe 10 boils and absorbs the heat generated by the heat generating element 1, and the air bubbles generated by the boiling are cooled on the radiating fin 8 side. It liquefies and returns to the heating element 1 side.

In this case, when the temperature of the exhaust gas from the radiator 9 is high, the side edge on the side of the heating element 1 is closed as shown by the thick line in FIG. Conversely, when the exhaust gas temperature is low, as shown in FIG. 11A , the opposite edge of the heating element 1 is closed, and the exhaust gas is positively flown into the heating element 1 side. It is desirable that the fixing plate 21a be configured to suppress a rise in temperature.

Further, the fixing plate 21b and the base plate 2
As shown in FIG. 12 or FIG. 13, in order to improve the thermal conductivity between the fixing plate 21a and the fixing plate 21a, it is desirable to form irregularities on the opposing surfaces of the fixing plate 21b and the base plate 21a and engage with each other. In the case of such a configuration, as shown in FIG. 12 (b), it is also possible to provide a gap 21 at the engagement portion of the unevenness and to actively introduce the cooling air from the fan device 3.

On the other hand, the method of fixing the heat pipe 10 to the radiator 9 is not limited to the method shown in FIG.
For example, as shown in FIG. 14, fixing via a fixing bracket 22 is also possible.

That is, the fixing bracket 22 is formed of a plate material having good heat conductivity, and has a pipe housing groove 22a for pressing the forked portion of the heat pipe 10 from above, and a fixing leg 22b formed by bending a fixing piece 22c at the upper end. And

The fixing bracket 22 is fixed to the radiator 9 by fastening the fixing pieces 22c together with the fan device 3 to the capitals of the radiating fins 8 located at the four corners of the radiator 9, and is not shown in this state. The forked portion of the heat pipe 10 is sandwiched between the upper surface of the radiator 9 and the pipe housing groove 22a.

In the above embodiment, the radiator 9
Although the case where one fan device 3 is mounted thereon is shown above, it is of course possible to provide two fan devices 3 at diagonal positions as shown in FIG.

[0035]

As is apparent from the above description, according to the present invention, since the heating element and the radiator are connected by the heat pipe, the cooling efficiency can be remarkably improved and the mounting height can be reduced. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a view showing details of FIG. 1, wherein (a) is a plan view,
(B) is a side view.

FIGS. 3A and 3B are views showing a second embodiment of the present invention, wherein FIG. 3A is a plan view and FIG. 3B is a side view.

4 (a) is a plan view, FIG. 4 (b) is a side view, and FIG. 4 (c) is an enlarged view of a portion C of FIG. 4 (b).

FIG. 5 is a view showing a fourth embodiment of the present invention, wherein (a) is a plan view and (b) is a side view.

FIG. 6 is a plan view showing a radiator.

FIGS. 7A and 7B are views showing a modification of FIG. 5, wherein FIG.
(B) is a plan view of the radiator.

8A and 8B are diagrams showing still another modification of FIG. 5, wherein FIG. 8A is a plan view and FIG. 8B is a plan view of a radiator.

FIG. 9 is a view showing a fifth embodiment of the present invention, wherein (a) is a side view and (b) is a plan view.

FIG. 10 is an exploded perspective view of FIG. 9;

FIG. 11 is an explanatory view showing formation of a wall surface on a radiator.

FIG. 12 is an explanatory view showing a method of fixing a heat pipe,
(A) is an exploded view, (b) is a side view showing an assembled state.

FIG. 13 is an explanatory diagram showing a modification of FIG.

FIG. 14 is a view showing a fixing bracket.

FIG. 15 is a view showing a modification of FIG. 9, wherein (a) is a side view,
(B) is a plan view.

FIG. 16 is a diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating element 2 Covering plate 3 Fan device 4 Air gap 5 Partition wall 6 Spring member 7 Ridge 8 Radiation fin 9 Radiator 10 Heat pipe

────────────────────────────────────────────────── (5) References JP-A-64-19754 (JP, A) JP-A-62-55000 (JP, A) JP-A-3-108747 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H01L 23/46

Claims (4)

(57) [Claims] 1. A radiator fixed on a printed board on which a heating element is mounted and having a plurality of radiating fins on an upper surface, a fan device fixed on an upper surface of the radiator, the radiator and the heating element One end of the heat pipe is connected to a heat radiator formed in the radiator.
On the radiator when fitted in the fitting space where the
Heating element cooling structure fixed to the surface . 2. A printed circuit board on which a heating element is mounted.
A radiator provided with a plurality of radiating fins on the upper surface, a fan device fixed to the upper surface of the radiator, and a heat pipe connecting the radiator and the heating element.
And one end of the heat pipe, the heat radiation fins are not erected
Fitted into the fitting space, and cooling structure of the heat generating element radiator side end of the heat pipe is branched into a fork shape 3. The fan unit according to claim 2 , wherein two radiators whose rotation directions are opposite to each other are fixed at diagonal positions.
Cooling structure of the heat generating element. 4. A radiator fixed on a printed circuit board on which a heating element is mounted and provided with a plurality of radiating fins on an upper surface, a fan device fixed on an upper portion of the radiator, the radiator and the heating element And a heat pipe for connecting the heat radiator and the heat generating element, wherein the heat radiator and the heat generating element are arranged adjacent to each other, and the exhaust from the radiator is caused to flow into the heat generating element side so that the exhaust suppresses the temperature rise of the heat generating element. Element cooling structure.