JP4797954B2 - Cooling structure of radiating fin - Google Patents

Description

The present invention relates to a cooling structure for heat radiation fins of electronic and electric equipment.

In electronic and electrical equipment, countermeasures against heat generation have become important due to the higher speed and higher output accompanying the digitization of equipment.

For example, (Patent Document 1) describes a cooling effect that is improved in order to reduce the size.

That is, as shown in FIG. 6, this product is provided with a plurality of rows of fins 3 arranged in parallel from a blowing port (suction port) 1 provided on one side to a discharge port (suction port) 2 on the other side. A chassis (heat radiating plate) 4 is recessed, and a heat generating component 6 is accommodated in the recess 5 to reduce the size of the case.

For this reason, in this case, the flow path 8 is narrowed by using the surface of the concave portion 5 facing the blowing port 1 as the inclined surface 7, and the flow rate of the air introduced from the blowing port 1 is increased by the narrowed flow channel 8 so as to enhance the cooling effect. I have to. At that time, the air compressed by narrowing the flow path 8 is supplemented by suction from the discharge port 2, so that the blower port 9 and the discharge port 2 are connected to the blower port 1 and the discharge port 2, as shown in FIG. 7. 10 are provided in parallel, and the cooling air from the fans 9 and 10 is applied to all rows of the fins 3.

Japanese Patent Laid-Open No. 11-307969

However, in the above, when the number of fin rows increases, there is a problem that a fan must be added in accordance with the increased number of fin rows.

That is, since each row of fins is formed in a row from the inlet to the outlet, if the cooling air is not blown in parallel with the fins formed in a row, the cooling air is uniformly distributed between the fins. It cannot be distributed, and the flow of wind stagnates between the air inlet and the fin, and sufficient heat dissipation characteristics cannot be obtained. Therefore, in order to uniformly apply the cold air to all the fin rows, it is necessary to increase the number of fans in accordance with the fin rows, rather than preparing a fan with a large air flow rate.

However, as described above, when the number of fans increases, noise increases and power consumption also increases. Further, when the number of parts increases, the cost increases and the failure rate increases.

Therefore, an object of the present invention is to improve the heat radiation characteristics by enabling efficient cooling with a small number of fans.

In order to solve the above problems, in the present invention, a plurality of rows of fins are provided in parallel and horizontally from the blow-in port at one end of the case toward the discharge port at the other end . The heat sink is provided with a vacant area that does not form a fan-shaped or semi-circular fin extending from the blowing port, the vacant area is below the area where the fin is provided, and the area where the fin is provided and the fin below the fin are provided. A configuration was adopted in which the vacant areas that are not formed are connected by an inclined surface, and the cooling air introduced from the blowing port is pooled in the vacant area and distributed between the fins via the inclined surface.

By adopting such a configuration, the cooling air introduced from the air inlet is pooled in the empty area, and is pushed by the cooling air introduced from the air inlet one after another and distributed along the fan-shaped or semicircular empty area, It can be uniformly distributed between the fins formed in a row.

At this time, the cooling air blown from the blowing port can be scooped up with the inclined surface and supplied to the fins without waste.

Further, at this time, a configuration is adopted in which the heights of the plurality of rows of fins formed in a row and directed toward the discharge port are made lower than the fins of the blowing port in the vicinity of the discharge port .

By adopting such a configuration, by reducing the height of the fins and expanding the space and reducing the pressure to generate a suction force, the flow velocity on the upstream side to the vicinity of the discharge port is increased and the exhaust is exhausted. Promote and allow efficient cooling.

Moreover, the structure which provided the discharge port in the case of the upper direction of a fin and the horizontal direction of a fin at this time is employable.

By adopting such a configuration, the exhaust ports are dispersed in the upper and lateral directions of the fins, so that the exhaust can be performed smoothly and can be efficiently cooled.

Also, at this time, between the fins provided in parallel with the fin end on the discharge port side, an inclined surface is used as an inclined surface, and cooling air passing between the fins is promoted to the discharge port of the case above the fins. it can be employed in the construction to.

By adopting such a configuration, exhaust to the upper discharge port is promoted and cooling can be efficiently performed.

Further, at this time, it is also possible to adopt a configuration in which the gap between the fins in the vicinity of the lateral discharge port is made shallow by providing a step with respect to the gap between the other fins.

By adopting such a configuration, the gap between the fins is made shallow, so that the cooling air can easily get over the fin in this shallow part, so that the exhaust to the lateral discharge port is guided, and the cooling can be efficiently performed. To.

Moreover, the structure which is a chassis which the heat sink attached the heat-emitting component can also be employ | adopted.

By adopting such a configuration, it is possible to improve the heat dissipation characteristics of the chassis to which the heat generating components are attached.

Since the present invention is configured as described above, the cooling can be efficiently performed, so that the heat dissipation characteristics can be improved.

The best mode for carrying out the present invention will be described below with reference to the drawings.

FIG. 1 shows an in-vehicle wireless device provided with a cooling structure for a radiation fin of the present application. As shown in FIG. 1, the radio device includes an upper case 20 and a lower case 21, and the upper case 20 is configured to cover a lower case 21 having a chassis 23 as shown in FIG. 2a. ing.

As shown in FIG. 1, the upper case 20 has a configuration in which a speaker hole 24 and discharge ports 25 a and 25 b are provided. The discharge ports 25a and 25b are composed of an upper discharge port 25a provided at the end of the upper surface of the case 20 and a horizontal discharge port 25b provided on the side surface of the end.

The lower case 21 includes a main body cover 21 a that covers the side surface and bottom surface of the chassis 23, and a front panel 21 b that is attached to the front surface of the chassis 23, both of which are screwed to the chassis 23.

The chassis 23 is molded by aluminum die casting, and includes a mounting portion 26 for attaching a circuit board, a speaker, and the like, and a heat radiating portion 27 for attaching a heat generating component.

The mounting portion 26 includes a front panel portion 26a, a rear panel portion 26b, and a central portion 26c, and the front panel 21b is attached to the front panel portion 26a. On the other hand, the rear panel portion 26b is provided with an air inlet 28 to screw the case fan 29, and on both sides of the screwed case fan 29, as shown in FIG. Is provided so that heat is also radiated from the chassis 23 itself. In addition, the central portion 26c of the mounting portion 26 is provided with an insertion hole such as a frame for attaching a circuit board or a speaker or a cable.

The heat radiating portion 27 is provided with a plurality of rows of fins 31 arranged in parallel from the blowing port 28 of the rear panel portion 26b of the mounting portion 26 of the chassis toward the other discharge ports 25a, 25b. As shown in FIG. 4, a heat generating component 32 such as an output transistor is attached.

The fins 31 are protrusions formed by aluminum die casting, and are provided through empty areas 33 that do not form the semicircular fins 31 that extend from the blowing port 28. By providing the semicircular empty area 33 in this way, the cooling air from the blowing port 28 is pooled once in the empty area 33. Then, the pooled cooling air is distributed along the empty area 33 and is uniformly distributed between the fins 31 formed at equal intervals in a line.

That is, the empty area 33 is formed in a semicircular shape with the case fan 29 approximately in the center. For this reason, the distance between the introduction end 31 a of the fin 31 facing the center of the case fan 29 and the case fan 29 is the distance between the introduction end 31 a of the fin 31 facing the end of the case fan 29 and the case fan 29. Longer than. By doing so, the distance from the case fan 29 to the fins 31 is ensured, so that the air blown from the case fan 29 is sufficiently accelerated and then distributed between the fins 31.

In this embodiment, the empty area 33 is semicircular according to the arrangement of the rows of fins 31, but may have a fan shape as long as there are fewer rows of fins 31.

Further, as shown in FIG. 4, the empty area 33 is formed on the inclined surface 34 inclined toward the blowing port 28, so that the cooling air from the blowing port 28 is scooped up by the inclined surface 34. The fins 31 can be supplied without waste. In this embodiment, the bottom surface of the chassis 23 on the side of the blowing port 28 is formed deeper than the bottom surface of the region where the fins 31 are provided, so that the inclined surface 34 reaches the middle of the blowing port 28. Thus, half the amount of air blown from the air inlet 28 is introduced to the fin 31 side, and the other half is introduced to the back side of the heat dissipating portion 27 for cooling. Incidentally, if the inclined surface 34 is made the lower end of the blowing port 28, it is possible to introduce 100% of the air supply amount to the fin 31 side. Since the cooling air can be divided in this way, for example, if the air volume is adjusted by changing the position of the inclined surface 34 reaching the inlet 28, the cooling efficiency can be changed according to the heat generation amount.

As shown in FIG. 3, the fin 31 has a narrow and streamlined introduction end 31 a on the side of the blowing port 28 to reduce resistance to cooling air. On the other hand, on the side of the discharge ports 25a and 25b, as shown in FIG. 5, the height of the fin 31 is lowered in the vicinity of the discharge port, and the space is widened by the lowered bottom 31b to reduce the pressure of the cooling air. Let By doing so, the flow velocity of the cooling air to the vicinity of the discharge ports 25a and 25b is increased to facilitate exhaust and cool the air efficiently. Further, at the terminal end 31c of the fin 31, as shown in FIG. 5, an inclined surface 35 inclined upward is formed between the fin 31 and the fin 31 at the end of the fin 31 so as to promote upward exhaust. Thus, the exhaust from the upward discharge port 25a of the upper case 20 positioned above can be made smooth. Further, as shown in FIG. 2b, a step is provided between the three fins 31 near the discharge port 25b in the lateral direction with respect to the four fins 31 on the left side. Then, the step is made shallow by providing such a step, and the cooling air is easily passed over the fin 31 by the shallow gap portion 36 so as to guide exhaust to the notch 37 of the chassis 23 provided in the lateral direction. It is. Here, the notch 37 communicates with the lateral outlet 25b when the upper case 20 is attached, and has an inclined surface toward the outlet 25b of the case 20, as shown in FIG. 2b. Thus, the exhaust can be made smooth. As described above, the discharge ports 25a and 25b are dispersed in the upward and lateral directions so that the exhaust can be smoothly performed and the cooling can be efficiently performed.

This configuration is configured as described above. When the air is blown from the case fan 29, the cooling air introduced from the blow-in port 28 is pooled in the empty area 33, and as shown in FIG. It is scooped up and supplied to the fins 31 without waste. At this time, the pooled cooling air is pushed by the cooling air introduced from the blowing port 28 one after another and is distributed along the semicircular shape of the empty area 33, and between the fins 31 formed in a row through the empty area 33. As shown in FIG.

This uniformly distributed cooling air cools the fins while passing between the fins 31. When the cooling air that has been warmed by cooling reaches the vicinity of the discharge ports 25a and 25b, the height of the fins 31 is reduced and the space is widened. To prevent the flow rate from decreasing.

Further, as shown in FIG. 5, when the discharge ports 25a and 25b are reached, the inclined surface 35 formed at the terminal end 31c of the fin 31 causes the seven fins 31 on the left side of FIG. The exhaust to the upper discharge port 25a is promoted, and the cooling can be performed efficiently. On the other hand, in the three fins 31 on the right side of FIG. 2a, the space between the fins 31 is shallow, as shown in FIG. 2b. The exhaust to the lateral discharge port 25b is promoted through the, so that cooling can be performed efficiently.

As described above, since the discharge ports 25a and 25b are dispersed in the upper and lateral directions of the fins 31, the exhaust can be performed smoothly, so that the cooling can be performed efficiently.

As described above, considering the flow of air from the inlet 28 to the outlets 25a and 25b, the fin structure is optimized and the fan 29 can be efficiently cooled and the heat radiation characteristics can be improved. Therefore, for example, the heat dissipation characteristics of the die cast as in the embodiment can be easily improved.

In the embodiment, the case fan is described with a case fan attached thereto, but the present invention is not limited to this, and cooling air may be introduced from the air inlet. You may provide in either one or both of a discharge port.

Moreover, in embodiment, although the fin of the thermal radiation part is a continuous thing, it is not limited to this. The fins may be divided fins such as a pin type as long as they are aligned in a line.

In the embodiment, the fin is integrally formed with the die-cast chassis. However, the present invention is not limited to this. For example, the heat radiating portion of the embodiment may be a heat radiating plate provided with fins.

Moreover, although what described the thing which attached the fan to the chassis was described in embodiment, it is not limited to this. In addition to this, even if the chassis does not have a chassis as in the embodiment, the case is provided with a blowing port, a case fan is attached, and the fins formed in a row from the blowing port toward the other discharge port are arranged in multiple rows in parallel. It is obvious that the configuration may be provided.

Since the present invention can optimize the cooling structure of the radiating fin in consideration of the flow of wind from the inlet to the outlet, it can be applied to a cooling system for electronic devices and electric devices using the radiating fin. .

Perspective view of the embodiment The perspective view of the principal part of embodiment Action explanatory diagram of the embodiment Plan view of the main part of the embodiment Action explanatory diagram of the embodiment The exploded perspective view of the principal part of an embodiment Action explanatory diagram of conventional example Perspective view of conventional example

Explanation of symbols

20 Upper case 21 Lower case 25a Upper discharge port 25b Horizontal discharge port 27 Heat radiation portion 28 Blowing port 29 Case fan 31 Fin 31a Introduction end 31b Bottom portion 31c Termination 33 Empty area 34 Inclined surface 35 Inclined surface 36 Shallow gap portion 37 cutout

Claims (6)

From the inlet (28) at one end of the case (20, 21) toward the outlet (25a, 25b) at the other end,
A space (33) in which a fan-shaped or semi-circular fin (31) extending from the blowing port (28) is not formed on a heat radiating plate provided in parallel with a plurality of rows of fins (31) formed in a row. The empty area (33) is provided below the area where the fin (31) is provided, and an area where the fin (31) is provided and an empty area (33) where the fin (31) below is not formed. Cooling air introduced from the inlet (28) is pooled in the empty area (33) and distributed between the fins (31) via the inclined surface (34) by connecting with the inclined surface (34). Cooling structure for radiating fins.   The height of the plurality of rows of fins (31) formed in the above-mentioned row and directed toward the discharge ports (25a, 25b) is set in the vicinity of the discharge ports (25a, 25b) on the side of the blowing port (28). The cooling structure of the radiation fin of Claim 1 made low with respect to the fin (31).   The cooling structure of the radiation fin of Claim 1 or 2 which provided the said discharge port (25a, 25b) in the case (20) of the horizontal direction of the fin (31) above the fin (31).   Between the fin (31) and the fin (31) provided in parallel with the fin (31) end on the discharge port (25a, 25b) side as an inclined surface (35), between the fin (31) and the fin (31) The cooling structure of the radiation fin according to claim 3, wherein exhaust of cooling air passing through the fin (31) to the discharge port (25a) of the case (20) above the fin (31) is promoted. The cooling structure of the radiation fin of Claim 3 which provided the level | step difference between the fin near the vicinity of the said discharge port (25b) of the said horizontal direction, and was shallow with respect to between other fins and fins. . The cooling structure for a heat radiation fin according to any one of claims 1 to 5, wherein the heat radiation plate is a chassis (23) to which a heat generating component is attached and covered by a case (20, 21).

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