JPH0529782A - Forced air cooling system - Google Patents

Abstract

PURPOSE:To provide a forced air cooling system for use in electronic devices whereby upon the system being interrupted owing to trouble of an air cooling fan an opening part of such a device is automatically more opened to facilitate heat dissipation from internal electric circuit parts of the electric device. CONSTITUTION:In an outer box including a fan 8 provided on the side thereof, a plurality of openings 4 are provided in the surface of the outer box, and, among the openings, in the openings 4 on the side thereof where the fan 8 is provided there is provided a cover 2 which is closed owing to suction of air caused by the rotation of the fan 8. The cover 2 is opened toward the outside of the outer box upon the interruption of the rotation of the fan 8 by the operation of a spring 3 provided between a surface plate of the outer box (an upper surface plate 1 in the figure) and the cover 2. Thus, heaters 6 and 7 accommodated in the outer box is air-cooled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced air cooling system used for electric equipment having a heating element inside.

[0002]

2. Description of the Related Art In an electric device forcibly cooling air by using a conventional fan, when the fan stops rotating due to a failure or the like, the temperature of an internal electric circuit component suddenly rises and a secondary It happened that the electric circuit parts failed. Therefore, in order to prevent secondary failure of electric circuit parts, a protection circuit that detects the rotation stop of the fan and automatically stops the circuit operation of the electric circuit is provided, or an alarm that notifies the rotation stop of the fan The device was equipped with electrical equipment.

[0003]

The provision of the protection circuit and the alarm device as described above in the electric equipment increases the cost of the equipment and makes the electric equipment complicated, and the protection circuit and the alarm device At the time of failure, there was also a problem that the secondary failure also increased. The present invention automatically opens the opening when the fan fails,
It is an object of the present invention to solve the problems by facilitating heat dissipation of internal electric circuit parts of electric equipment.

[0004]

FIG. 1 is a vertical sectional side view showing an essential part of an apparatus incorporating a forced air cooling system according to an embodiment of the present invention. As shown in FIG. In an outer box provided with a fan 8, a plurality of openings 4 are provided on the surface of the outer box, and an opening 4 of the plurality of openings 4 on the side where the fan 8 is provided is closed by intake of air by rotation of the fan 8. With the lid 2 in the closed state, when the rotation of the fan 8 is stopped,
The lid 2 is opened to the outside of the outer box by the operation of a spring 3 provided between the surface plate of the outer box (top plate 1 in FIG. 1) and the lid 2, The heating elements 6 and 7 housed inside are air-cooled.

[0005]

According to the present invention, the lid 2 of the opening 4 in the vicinity of the fan 8 is automatically closed by the flow of the air sucked into the fan 8 through the opening 4 by the rotation of the fan 8 according to the above-mentioned structure. The flow of air sucked into the fan 8 through the opening 4 without the lid 2 at the far side of the fan 8 allows the electric circuit parts such as the heating elements 6 and 7 housed inside the outer box to be uniformly air-cooled. . FIG. 2 is an explanatory diagram showing the operation of the forced air cooling system when the rotation of the fan 8 is stopped in FIG. 1. As shown in FIG.
When the rotation stops due to a failure or the like, the flow of the air sucked by the fan 8 stops, so that the lid 2 is automatically opened by the spring 3 provided in the opening 4, and The electric circuit parts such as the heating elements 6 and 7 housed inside the box are easily dissipated to suppress overheating of the electric circuit parts and prevent deterioration due to overheating.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a vertical cross-sectional side view showing the essential parts of an apparatus incorporating a forced air cooling system according to an embodiment of the present invention.
8 is a fan for air cooling, provided on one side of the outer box,
Further, a plurality of openings 4 are provided in the top plate 1 and the side plate 5 of the outer box, and the fan 8 of the top plate 1 among the plurality of openings 4 is provided.
A lid 2 that is closed by intake air generated by rotation of a fan 8 is provided in an opening 4 on the side where the fan is provided. A printed circuit board 9 to which electric circuit components such as heating elements 6 and 7 are attached is arranged inside the outer box, and an opening 4 without a lid 2 is provided at a distance from the fan 8.
Is provided on the upper surface plate 1 and the side surface plate 5 so that the opening 4 is not provided near the fan 8, for example, on both side surfaces or the bottom surface of the outer box. The flow of air sucked into the fan 8 allows the electric circuit parts such as the heating elements 6 and 7 housed inside the outer box to be uniformly air-cooled.

FIG. 2 is an explanatory diagram showing the operation of the forced air cooling system when the rotation of the fan is stopped in FIG. 1. As shown in FIG. By the operation of the spring 3 provided between the upper plate 1 and the lid 2, the lid 2 is opened to the outside of the outer box, and the electric circuit parts of the heating elements 6 and 7 housed inside the outer box. It is easy to dissipate heat and suppress overheating of electric circuit parts,
It is designed to prevent deterioration due to overheating. FIG. 3 is a partially enlarged view of a portion marked with a circle in FIG. 2. When the lid 2 is closed, the lid 2 is prevented from being drawn into the outer box by the flow of air sucked by the fan 8. The supporting tool 11 of the lid 2 is attached to another portion of the upper surface plate 1 facing the upper surface plate 1 to which the is attached using an adhesive or the like.

The upper plate 1 and the lid 2 are made of a synthetic resin material integrally, and the connecting portion is made thin so that it can be bent like a hinge. A fixture for attaching the spring 3 to the back faces of the upper plate 1 and the lid 2 12 and 13 are attached using an adhesive or the like, and both ends of the spring 3 are fixed by fixing tools 12 and 13, so that the spring 3 is held. Also, the top plate 1 and the lid 2
Alternatively, the separately molded products may be connected by a hinge and used. As the spring 3, a generally used wire-shaped spring, a leaf spring, or the like is used. As the spring material, the lid 2 is closed by the flow of air sucked into the fan 8 by the rotation of the fan 8. , The one having such strength that the lid 2 is automatically opened when the rotation of the fan 8 is stopped is selected and used.

Alternatively, as the material used for the spring 3,
For example, a shape memory alloy is used, and by utilizing the two crystal structures of the shape memory alloy, the spring 3 made of the shape memory alloy is cooled by the flow of air sucked into the fan 8 to form the shape memory alloy into the first crystal. With the structure, the spring 3 is contracted so that the lid 2 is closed, and when the rotation of the fan 8 is stopped due to a failure or the like,
A heating element housed inside the outer box by causing the shape memory alloy to have a second crystal structure by the radiant heat generated by the heating of the electric circuit parts such as the heating elements 6 and 7 to extend the spring 3 and open the lid 2. You may make it easy to radiate heat | fever of electric circuit components, such as 6 and 7. In the embodiment shown in FIG. 1, the opening 4 provided with the lid 2 is provided only on the upper surface plate 1, but the openings 4 provided with the lid 2 are also provided on both side surfaces close to the mounting surface of the fan 8 and the bottom surface 10. By providing it, it is possible to easily radiate heat from the heating elements 6 and 7 when the rotation of the fan 8 is stopped.

[0010]

As described above, according to the present invention,
The opening provided in the outer box near the fan should be closed during normal use to cool the heating elements inside the outer box, such as electric circuit parts, so that when the fan fails, the opening near the fan automatically opens. It is opened so that heat can be easily dissipated from the internal electric circuit parts and the like, and an effective forced air cooling system can be provided.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a main part of an apparatus incorporating a forced air cooling system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of the forced air cooling system when the fan stops rotating in FIG.

FIG. 3 is a partially enlarged view of a portion marked with ◯ in FIG.

[Explanation of symbols]

1 Top plate 2 lid 3 springs 4 openings 5 Side plate 6 electrical components 7 electrical components 8 fans 9 printed circuit boards 10 Bottom plate 11 Support 12 fixtures 13 Fixture

Claims (2)

[Claims] 1. An outer box provided with a fan on one side surface, wherein a plurality of openings are provided on a surface of the outer box, and among the plurality of openings, an opening on a side provided with the fan is rotated by a fan. A lid that is closed by intake air is provided, and when the rotation of the fan is stopped, the lid is opened outside the outer box by the operation of a spring provided between the surface plate of the outer box and the lid. A forced air cooling system characterized by cooling the heating element housed inside the box by air. 2. The forced air cooling system according to claim 1, wherein a shape memory alloy having bidirectional expansion and contraction is used as a material used for the spring.