JP2009100508A - Ventilating cooler for control panel, and control panel using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilating cooler for control panel, which is small-sized and is high in cooling efficiency. <P>SOLUTION: This ventilating cooler for control panel has a heat sink 2, which transmits the heat of heating parts 1, a horizontal section wind tunnel 5, which leads cooling air 8 in a horizontal direction to the heat sink, a vertical section wind tunnel 7, which is connected vertically from the end of the horizontal section wind tunnel so as to lead cooling air upward, and an exhaust fan 6, which is attached to the top of the vertical section wind tunnel so as to suck up the cooling air. It has a throttle section 10, which narrows the sectional area of the horizontal section wind tunnel, inside of its upper corner that is a border between the horizontal section wind tunnel and the vertical section wind tunnel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ventilation cooling structure around a heat sink of a control panel on which an electronic device is mounted.

2. Description of the Related Art Conventionally, there is a ventilation cooling device for a control panel equipped with an electronic device, which includes a heat sink, a horizontal duct, and a cooling fan (see, for example, Patent Document 1).
FIG. 5 shows the overall structure of the control panel in which a part of the structure of the control panel is changed. In the figure, 1 is a heat generating component, 2 is a heat sink, 5 is a horizontal wind tunnel, 6 is a cooling fan, 7 is a vertical wind tunnel, and 8 is cooling air. In addition, 11 is a housing | casing and 12 is an inlet port.
6A and 6B are diagrams showing details of the ventilation cooling device, where FIG. 6A is a side sectional view, and FIG. 6B is a front view of the heat sink 2 viewed from the arrow A. FIG.
The ventilation cooling device includes a horizontal horizontal wind tunnel 5 provided so as to wrap the heat sink 2, and a vertical vertical wind tunnel 8 that guides the cooling air 8 heated by the heat sink 2 of the horizontal wind tunnel 5 to the cooling fan 6. Is formed by connecting at right angles. The heat sink 2 is formed by providing a heat radiating fin 4 on a base portion 3 on which a heat generating component 1 is mounted. The horizontal wind tunnel 5 has a plurality of stages, and these end portions are connected by a vertical wind tunnel 8.
Therefore, the cooling air 8 is supplied from the air inlet 12 installed at the lower part of the casing 11, receives heat from the heat radiation fins 4 of the heat sink 2 through the horizontal wind tunnel 5, and is cooled by the cooling fan 6 from the vertical wind tunnel 8. 11 is discharged to the outside.
Further, in the connecting portion of the horizontal wind tunnel 5 and the vertical wind tunnel 8 as shown in FIG. 7, a part of the vertical wind tunnel 8 protrudes so as to limit the passage path of the cooling air 8. Has also been proposed.
Japanese Patent Laid-Open No. 9-314432

In the conventional wind tunnel structure, the cooling air is easy to pass through the low temperature part on the tip side of the radiating fin away from the heat generating component due to the position of the cooling fan, and the high temperature part on the base side of the radiating fin close to the heat generating component. Since it is difficult to pass through the heat sink, the heat dissipating ability of the heat sink is reduced, and the cooling efficiency is deteriorated.
Further, in the structure in which a part of the surface of the vertical wind tunnel 8 protrudes so as to restrict the passage path of the cooling air 8 at the connection part of the two types of wind tunnels, the heat radiation fin base side close to the heat generating component Although it is possible to pass the cooling air through the high temperature part of the heat sink, turbulent flow is generated in the connecting part of the heat sink wind tunnel and the cooling fan wind tunnel (turbulent flow part 9). Due to the increase in resistance, the ventilation capacity of the cooling fan was lowered and the cooling efficiency was deteriorated.
In order to improve the cooling efficiency, it is possible to increase the cooling air capacity by increasing the cooling fan capacity or the number of cooling fans, increasing the heat dissipation capacity by increasing the size of the heat sink, and reducing the heat sink temperature rise, etc. These methods have caused an increase in the size of the apparatus.
In order to solve such problems, the present invention restricts the passage path of the cooling air inside the wind tunnel while suppressing the increase in resistance of the passage path of the cooling air, and actively supplies the cooling air to the high temperature portion of the radiating fin. It is an object of the present invention to provide a ventilation cooling device for a control panel that is small and has high cooling efficiency.

In order to solve the above problems, the present invention is as follows.
The invention according to claim 1 is connected to the heat sink that transmits heat of the heat generating component, the horizontal wind tunnel that guides the cooling air in the horizontal direction with respect to the heat sink, and the vertical portion from the end of the horizontal wind tunnel. In the ventilation cooling device for a control panel, comprising: a vertical wind tunnel for guiding the cooling air upward; and an exhaust fan attached to an upper end of the vertical wind tunnel to suck up the cooling air. In the upper corner, which is the boundary with the vertical wind tunnel, there is provided a throttle section that narrows the cross-sectional area of the horizontal wind tunnel.
According to a second aspect of the present invention, an inclined plate is provided on the upper surface of the horizontal portion wind tunnel at the throttle portion so as to be inclined relative thereto.
According to a third aspect of the present invention, the end surface of the inclined plate on the side opposite to the fixed side is fixed to the throttle portion to an extension portion that is formed by extending one surface of the vertical portion wind tunnel from the corner portion.
According to a fourth aspect of the present invention, a triangular prism body is fixed to the corner portion of the throttle portion.
According to a fifth aspect of the present invention, the throttle unit is provided with an angle adjusting unit that adjusts an angle with respect to the horizontal wind tunnel.
A sixth aspect of the present invention is a control panel including the ventilation cooling device according to the first to fifth aspects.

According to the first to fourth aspects of the present invention, the cooling efficiency is improved by positively passing the cooling air through the high temperature portion below the radiating fin.
According to the invention described in claim 5, since the cooling air can be adjusted depending on the size and shape of the wind tunnel, high cooling efficiency can be maintained even in various models.
According to the sixth aspect of the present invention, a control panel having a small size and high cooling efficiency can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial side cross-sectional view of a ventilation cooling device for a control panel showing Embodiment 1 of the present invention. In the figure, reference numeral 10 denotes an aperture portion. Other symbols are the same as in the conventional example. FIG. 2 is an enlarged cross-sectional view of the throttle unit 10.
The ventilation cooling device of the present invention is guided by a cooling fan 6 installed at a position higher than the heat radiating fin 4, a horizontal wind tunnel 5 provided so as to surround the heat sink 2, and the cooling fan 6 as in the conventional example. The vertical vertical wind tunnel 8 is connected at a right angle.
The throttle unit 10 is configured such that an inclined plate 10 a is fixed while being inclined between a wall on the upper surface of the horizontal wind tunnel 5 and an extension 7 a extending downward from the vertical wind tunnel 7.
Next, the operation of this embodiment is as follows. When the power of the electronic device is turned on, cooling air 8 flows by the cooling fan 6. In the restricting portion 10, the cooling air 8 is restricted in the ventilation path to the high temperature portion on the base side of the radiating fin 4 close to the heat generating component 1, so the high temperature portion on the base side of the radiating fin 4 close to the heat generating component 1 is changed. Pass through intensively. For this reason, the heat dissipation capability of the heat sink is improved, and the cooling efficiency can be improved. Further, since the generation of turbulent flow is eliminated by the throttle unit 10, the ventilation capacity of the cooling fan 6 can be adjusted by changing the resistance of the ventilation path, and the optimum cooling efficiency can be set.

FIG. 3 is a partial cross-sectional view of the throttle portion showing Embodiment 2 of the present invention. In the figure, reference numeral 10b denotes an adjusting unit that adjusts the angle of the inclined plate 10a. Other reference numerals are the same as those in the first embodiment, and operations are the same as those in the first embodiment. The angle adjustment unit 10b may be any type such as a screw type or a slide rail type.
In this embodiment, since the adjusting unit 10b that adjusts the angle of the inclined plate 10a of the throttle unit 10 is used, generation of turbulence is eliminated by the inclined plate 10a, and at the same time, the resistance of the ventilation path is changed by changing the resistance of the ventilation path. Since the ventilation capacity can be adjusted, it is possible to set the optimum cooling efficiency.
In addition, the angle adjusting unit 10 b is used to restrict the passage of the cooling air inside the wind tunnel while suppressing an increase in the resistance of the passage of the cooling air 8, and actively pass the cooling air through the high temperature portion of the radiating fin 4. As a result, the cooling efficiency is improved, the capacity and number of cooling fans can be optimized, and the heat dissipating capacity of the heat sink can be optimized, so that the apparatus can be miniaturized.

FIG. 4 is an enlarged cross-sectional view of the throttle portion showing Embodiment 3 of the present invention. In the figure, 10c is a triangular prism. Other reference numerals are the same as those in the first embodiment, and operations are the same as those in the first embodiment. Any triangular prism body 10c can be used as long as it has an inclined surface, such as a solid one or a bent plate.
In the present embodiment, since the triangular portion 10c is fixed to the throttle portion 10, the extension portion 7a of the vertical wind tunnel 7 and the angle adjustment portion 10b are not necessary as compared with the first and second embodiments, and the manufacturing is easy and the cost is reduced. There is no effect.

  Since the cooling fan capacity and number can be optimized and the heat sink can be optimized, it can contribute to the miniaturization of future devices.

The partial sectional side view of the ventilation cooling device of the control panel which shows Example 1 of this invention FIG. 1 is an enlarged cross-sectional view showing the throttle portion of FIG. The expanded sectional view of the aperture | diaphragm | squeeze part which shows Example 2 of this invention The expanded sectional view of the aperture | diaphragm | squeeze part which shows Example 3 of this invention Overall schematic showing a conventional control panel Partial side sectional view showing a conventional control panel ventilation cooling device Partial side sectional view showing a conventional cooling device for another control panel

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heat generating component 2 Heat sink 3 Base part 4 Radiation fin 5 Horizontal part wind tunnel 5a Upper surface part 6 Cooling fan 7 Vertical part wind tunnel 7a Extension part 8 Cooling air 9 Turbulence part 10 Restriction part 10a Inclined plate 10b Angle adjustment part 10c Triangular prism Body 11 Housing 12 Inlet

Claims (6)

A heat sink for transferring heat of the heat generating component, a horizontal wind tunnel for guiding cooling air to the heat sink in a horizontal direction, and a vertical portion connected vertically from the end of the horizontal wind tunnel to guide the cooling air upward In the ventilation cooling device for a control panel, comprising a part wind tunnel and an exhaust fan attached to the upper end of the vertical part wind tunnel and sucking up the cooling air,
A ventilating cooling device for a control panel, characterized in that a constricted portion for narrowing a cross-sectional area of the horizontal portion wind tunnel is provided inside an upper corner portion that is a boundary between the horizontal portion wind tunnel and the vertical portion wind tunnel.   2. The ventilation cooling device for a control panel according to claim 1, wherein the throttle part is provided with an inclined plate inclined on the upper surface of the horizontal part wind tunnel.   3. The ventilation cooling device for a control panel according to claim 2, wherein the constricted portion fixes an end surface of the inclined plate on the side opposite to the fixed side to an extended portion obtained by extending one surface of the vertical portion wind tunnel from the corner portion. .   The ventilation cooling device for a control panel according to claim 1, wherein the throttle portion has a triangular prism fixed to the corner portion.   The ventilation cooling device for a control panel according to claim 1, wherein the throttle unit includes an angle adjusting unit that adjusts an angle with respect to the horizontal wind tunnel.   A control panel comprising the ventilation cooling device for a control panel according to claim 1.

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