JP2002124793A - Cooling structure of electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise cooling effect by sufficiently utilizing a blast capability of a cooling fan related to a forced cooling structure. SOLUTION: A cooling structure of an electronic apparatus 1 is provided which comprises a heat sink 17 and a plurality of fans 19a, 19b, and 19c which send air to the heat sink for cooling. Here, at least one fan is arranged tilted so that the whole air from the fan enters the heat sink.

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 electronic equipment that performs forced cooling using a cooling fan.

[0002]

2. Description of the Related Art In recent years, as electronic devices have become more sophisticated, the amount of heat generated by electronic components mounted on a wiring board has also increased, and high-density mounting has been promoted with the miniaturization of electronic devices. It is difficult to secure a sufficient heat radiation area, and the heat load inside the electronic device is increasing more and more. Cooling of the electronic components is indispensable for exhibiting the normal function of the electronic components.

[0003] Therefore, in the case where the mounting density is high and a sufficient amount of heat radiation cannot be obtained by natural heat radiation, forced cooling is performed using a cooling fan in order to increase the cooling capacity.

A cooling structure of a conventional electronic device having a cooling fan and performing forced cooling will be described with reference to FIGS.

FIG. 3 shows a simplified electronic device 1 with a part broken away.
FIG. 2 is a perspective view of the electronic device 1. The electronic device 1 includes a housing 2, a printed circuit board unit 3 incorporated in the housing 2, and a fan unit 4.

The housing 2 is formed in a rectangular parallelepiped shape whose front and rear sides are opened by left and right side plates 5 (one is not shown), an upper plate 6 and a lower plate 7, and is provided between the upper plate 6 and the lower plate 7. A front shelf 8 and a rear shelf 9 are provided to extend over the left and right side plates 5.
The upper plate 6 is formed by pulling out and forming upper guide rails 11 extending forward and rearward at required intervals, and portions other than the upper guide rails 11 are upper ventilation holes 10. A lower guide rail 12 facing the upper guide rail 11 and extending between the front shelf plate 8 and the rear shelf plate 9 is provided. A back boat 13 is attached to the rear surface of the housing 2 and the back board 1
A connector (not shown) to which the printed board unit 3 is plugged in is attached to 3.

The printed circuit board unit 3 is mounted between the upper guide rail 11 and the lower guide rail 12, and a rear end of the printed board unit 3 is plugged into a connector (not shown) of the back board 13.

Next, the printed circuit board unit 3 will be described.

An electronic component is mounted on one surface of the printed wiring board 14, and a protective cover 15 is further mounted. A radiator 17 having vertically extending fins 16 is mounted on the other surface of the printed wiring board 14. ing. The upper and lower ends of the printed wiring board 14 are the protective cover 15,
The upper guide rail 1 protrudes from the radiator 17.
1. It is slidably fitted to the lower guide rail 12.

The fan unit 4 is mounted between the front shelf 8, the rear shelf 9 and the lower plate 7. The fan unit 4 has a structure in which a required number of fans 19 are accommodated in a flat box-shaped fan case 18. The upper surface of the fan case 18 is open, and the lower surface has ventilation holes concentric with the respective fans 19. 21 are drilled. In addition, a rectangular suction hole 22 is formed in the lower plate 7 so as to face the ventilation opening 21.

When the electronic device 1 is in operation, the fan 19 is driven, air is sucked from the lower front surface, the lower rear surface of the housing 2 and the suction hole 22, and the wind discharged from the fan 19 is used for the printing. The air passes through the space between the board unit 3 and the printed board unit 3 (one of which is not shown) and is discharged from the upper ventilation hole 10.

While the wind passes between the printed circuit board unit 3 and the printed circuit board unit 3, heat is removed from the fins 16 to cool the printed circuit board unit 3, ie, the electronic components inside the protective cover 15.

[0013]

When the amount of heat generated by the printed circuit board unit 3 is increased and it is desired to further enhance the cooling effect, it is conceivable to increase the number of the fans 19 and the blowing capacity of the fans 19 alone. , The installation space of the fan unit 4 is physically limited, and the fan 1
There is a limit to increasing the number 9 and the blowing capacity of the fan 19. Further, a commonly used cooling fan is of an axial flow type, and further has a fan motor 23 incorporated in a central portion thereof.
The periphery of the fan motor 23 is a blower blade 24.
Accordingly, the flow velocity of the discharge air is low on the downstream side of the fan motor 23 at the center and high on the downstream side of the blower blades 24 around the fan motor 23.

The distance between the radiator 17 and the discharge surface of the fan 19 is not sufficient, so that the discharge air flows into the radiator 17 with an uneven flow velocity distribution. Further, the front-rear length of the radiator 17 is shorter than the front-rear length of the total number of the fans 19, and the front end of the frontmost fan 19 and the rear end of the rearmost fan 19 are the front shelf 8 Behind the rear shelf 9, the wind discharged from the front and rear ends of the frontmost fan 19 and the rearmost fan 19 where the flow velocity is the fastest is the front shelf 8 and the rear shelf 9. And does not flow directly into the radiator 17. The colliding wind becomes a vortex, causing energy loss, and it is not possible to obtain a wind corresponding to the number of the fans 19.

The present invention has been made in view of the above circumstances, and aims to increase the cooling effect by sufficiently utilizing the blowing capacity of a cooling fan in a forced cooling structure.

[0016]

According to the present invention, there is provided a cooling structure for an electronic device having a radiator and a plurality of fans for blowing and cooling the radiator. The present invention relates to a cooling structure for electronic equipment in which at least one of the fans is inclined so as to flow into a radiator.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the same components as those shown in FIGS. 3 and 4 are denoted by the same reference numerals, and description thereof will be omitted.

A printed circuit board unit 3 is provided on the upper part of the housing 2, and a fan unit 25 is provided below the printed circuit board unit 3.

The fan unit 25 is mounted between the front shelf 8, the rear shelf 9 and the lower board 7.

Next, the fan unit 25 will be described.

The fan unit 25 includes a fan case 2
6, the required number (three in the figure) of fans 19a, 19b,
19c.

The fan case 26 has a fan frame 27 whose plate is formed in a concave shape, and a fan mounting plate 28 fixed to the fan frame 27. The fans 19a, 19b, 19c are mounted on the fan mounting plate 28. Mounted.

The fan mounting plate 28 is bent at two places in the front and rear, and has an inverted mountain shape so that a horizontal portion, a front inclined portion, and a rear inclined portion are formed. The fans 19a, 19b, 19
c is attached to the horizontal portion, the front inclined portion, and the rear inclined portion, and the horizontal portion, the front inclined portion, and the rear inclined portion are provided with intake ports 29, respectively. The fan frame 27 has a ventilation port 21 formed so as to face the intake port 29, and the ventilation port 21 matches a suction hole 22 formed in the lower plate 7 of the housing 2. Further, a horizontal ventilation port 31 is formed in the front plate portion and the rear plate portion of the fan frame 27.

Of the fans 19a, 19b and 19c,
The fan 19a attached to the front inclined portion and the fan 19c attached to the rear inclined portion have their axis inclined toward the center of the fin 16 of the radiator 17, and the axis of the fan 19b attached to the horizontal portion is It is parallel to the fins 16.

The front end of the fan 19a and the fan 19
The inclination of the fans 19a and 19c is set so that the front-rear length up to the rear end of the radiator c coincides with the front-rear length of the radiator 17. Alternatively, the point where the front end of the fan 19a extends parallel to the axis coincides with the front end of the radiator 17, and the point where the rear end of the fan 19c extends parallel to the axis is behind the radiator 17. The inclination of the fans 19a and 19c is set so as to coincide with the ends. Further, structures such as the front shelf 8 and the rear shelf 9 correspond to the fan 19a and the fan 1a.
Fans 19a and 19c do not protrude into the air passage of 9c.
The arrangement of b and 19c is set.

When the fans 19a, 19b and 19c are driven to cool the printed circuit board unit 3, outside air is sucked from the ventilation holes 21 and the suction holes 22 and from the horizontal ventilation holes 31 and is discharged upward. You. The wind discharged from the fan 19b located at the horizontal portion (center) flows into the radiator 17 as a wind parallel to the fins 16, and the wind discharged from the fans 19a and 19c flows into the fins 16. The radiator 17 is inclined with respect to the radiator 17
Flows in a straight line. The fan 19a and the fan 19c
There is no obstruction in the flow path from the radiator to the radiator 17, no vortex is generated, and no pressure loss occurs.

The direction of suction of the outside air from the horizontal ventilation port 31 is inclined with respect to the axis of the fans 19a and 19c. Pressure loss is reduced, and intake efficiency is improved.

Although the above embodiment has been described in connection with the case where the number of the fans 19 is three, the present invention can be similarly applied to the case where the number of the fans 19 is two or four or more. For example, in the case of two, inclining only one or inclining two in contrast, for example, in the case of four, inclining two of the ends, and so on.

[0030]

As described above, according to the present invention, in a cooling structure of an electronic device having a radiator and a plurality of fans for cooling by sending air to the radiator, the wind from the fan is completely reduced. Since at least one of the fans is inclined so as to flow into the radiator, the total discharge air volume is linear even when the sum of the dimensions on the discharge side of the fan is longer than the length of the cooling air inflow side of the radiator. In particular, there is no eddy flow, the pressure loss can be reduced, the air blowing capacity of the fan can be sufficiently utilized, and the cooling effect can be enhanced.

[Brief description of the drawings]

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

FIG. 2 is a side sectional view showing the first embodiment.

FIG. 3 is a partially broken perspective view showing a conventional example.

FIG. 4 is a side sectional view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic device 3 Printed circuit board unit 4 Fan unit 19 Fan 25 Fan unit 26 Fan case 27 Fan frame 28 Fan mounting plate

Claims (1)

[Claims] 1. A cooling structure for an electronic device, comprising: a radiator; and a plurality of fans for blowing and cooling the radiator.
A cooling structure for an electronic device, wherein at least one of the fans is inclined so that a total amount of air from the fan flows into the radiator.