JPH10270880A - Switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the cooling efficiency of a unit group and to reduce the depth size of a switchboard by a method wherein both side faces of a protruding part are made open without installing any side-face plates, a plurality of units are stacked and the unit group is constituted. SOLUTION: Both sides of covers 8 which constitute units 7 are opened, and side-face plates are not installed. Printed-circuit boards 11 are attached respectively, via support implements 10, at the inside of back plates 6 at the respective units 7. Then, when an ascending aerial current is generated due to a rise in the temperature of the printed-circuit boards 11, the air flows as shown in the figure. That is to say, the air flows into an enclosure 5 from an intake hole 5a and which creeps to the inside of the covers 8 from protruding parts 9 on the front side of the covers 8 at the units 7 is given heat from the printed-circuit boards 11 so as to become lightweight, it is moved to the upper part from opening parts on both sides of the covers 8, and it is discharged from an evacuation hole 5b. In addition, in the unit 7 in the lowermost part, the air flows to the inside of the over 8 directly from the lower part of the cover 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a switchboard, and relates to an improved cooling structure of a group of units housed therein.

[0002]

2. Description of the Related Art A plurality of units are vertically stacked in a switchboard. In this case, if the switchboard has a configuration of natural cooling, a unit group in which units are stacked is configured as follows.

That is, as shown in FIG. 6, units 1 and wind guide units 2 are alternately stacked in a housing 5. The bottom plate 1a and the ceiling plate 1b of the unit 1 have ventilation holes (not shown), while the front plate 2a and the rear plate 2b of the wind guide unit 2 also have ventilation holes. In addition to the inclined plate 2 inside the wind guide unit 2
and a printed board (not shown) is housed inside the unit 1.

The upward flow of air around the printed board due to the heat generated by the printed board causes an airflow from below to above in the housing 5, from the front plate 2 a to the inside of the wind guide unit 2 as shown by the arrow in FIG. The air that has flowed into the unit 1 flows from the bottom plate 1a into the unit 1 and then is discharged behind the rear plate 2b via the ceiling plate 1b and the wind guide unit 2.

[0005]

However, the overall height of the switchboard is increased and the cost is increased by the amount of the wind guide unit. Further, since the front plate of the wind guide unit is parallel to the vertical plane, it is difficult for outside air to flow into the inside of the wind guide unit. Furthermore, since air discharged from the back plate of the wind guide unit flows upward from behind the unit, a space as a duct must be provided behind the unit group, and the switchboard becomes large in the front-rear direction. .

[0006] Therefore, an object of the present invention is to provide a switchboard which solves such a problem.

[0007]

According to a first aspect of the present invention, there is provided a switchboard having a single back plate.
A plurality of upper plates protruding horizontally toward the front surface are provided at substantially equal intervals in the vertical direction, a front plate protruding vertically downward from the front end of each upper plate is provided, and the vicinity of the lower end of the front plate faces forward. A protruding portion is formed so as to protrude, and a unit group is formed in which a plurality of units are stacked by being opened without providing side plates on both side surfaces.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 shows the configuration of a unit group in a switchboard according to the present invention. As shown in the figure, a housing 5 having a closed structure is provided, and an intake hole 5a is formed at a lower portion of the front surface of the housing 5, while an exhaust hole 5b is formed at the upper surface. Four units 7 are provided inside the housing 5 in the up-down direction while being attached to the back plate 6 of the housing 5.

Next, the configuration of each unit 7 will be described. Four covers 8 are attached to the inside of the back plate 6 at substantially equal intervals in the vertical direction. The cover 8 includes an upper surface plate 8a that projects horizontally from the rear surface plate 6 toward the front surface, and an upper surface plate 8a.
And a front plate 8b extending downward from the front end of the front panel. By forming a step near the lower end of the front plate 8b,
An overhang 9 protruding forward is formed. Then, both sides of the cover 8 constituting the unit 7 are open, and no side plate is provided. A printed board 11 is attached to the inside of the back plate 6 of each unit 7 via a support 10.

Next, the operation of the switchboard will be described. When a rising airflow is generated due to a rise in the temperature of the printed board 11, the flow of air is as shown in FIG. That is, the air that has flowed into the housing 5 from the air intake holes 5a and has entered the inside of the cover 8 from the overhanging portion 9 on the front side of the cover 8 in each unit 7 expands by being given heat from the printed board 11. It becomes lighter, moves upward from the openings on both sides of the cover 8, and is discharged from the exhaust hole 5b. In the lowermost unit 7, air flows directly into the inside of the cover 8 from below the cover 8.

Next, a change in temperature due to the shape of the cover in the unit group was examined. As the unit group, those having three types of structures shown in FIGS. 2A, 2B, and 2C are shown in FIG.
As shown in FIG. Unit A in FIG. 2A has only a printed board 11 attached to the back plate via an insulator similarly to FIG. 1B, and unit B in FIG. A cover 8 having a flat front plate 8b and a top plate 8a having no protrusion is provided, and an intake hole 13 and an exhaust hole 12 are provided in the front plate 8b. The unit C in FIG. 3 is a unit according to the present invention.

In the unit A, when the units are arranged in the up-down direction, it is the same as combining four printed boards in the up-down direction. When the units A are arranged in the up-down direction as shown in FIG. The temperature measured at the upper and lower positions in each unit becomes higher as going upward as shown in (a).
In the unit B, as shown in FIG. 3A, a part of the air flowing from the intake hole 13 is exhausted from both sides, but most of the air is exhausted from the exhaust hole 12, and the heat discharged from the lower unit is removed. Although a part flows into the unit above it, the temperature is lower than that of the unit A as shown in FIG. In the unit C, as shown in FIG. 3D, a lot of air is sucked from the overhang portion and discharged from the side, so that the high-temperature air discharged from the lower unit is sucked into the upper unit. As shown in FIG. 4, the line indicated by (c) is lower than the line indicated by (b) by 3 to 4 ° C. because the air is sucked out more than the unit B. By comparing the three types of units as described above, the greatest cooling effect can be obtained if the overhanging portion is provided in front of the unit to take in more air and discharge to the side as in the present invention. I understand.

FIG. 5 shows a case where the conventional unit is housed in a housing having the same height and a case where the unit of the present invention is housed. Assuming that the stacking height of the units in the housing 5 is H, conventionally only four units 1 can be stacked to interpose the wind guide unit 2, but in the present invention, five units 7 are stacked. Can be. Conventionally, since the air was exhausted to the rear of the unit 1, the duct width S had to be formed toward the rear as shown in FIG. The width S becomes unnecessary, and the depth dimension of the switchboard can be reduced accordingly. In the present invention, the front plate has a function of guiding air to the inside of the cover and a function of protecting the printed board.

[0015]

As can be seen from the above description, claim 1
According to the switchboard according to (1), since the wind guide unit conventionally provided between the units is omitted, the height of the unit group and further the switchboard can be made lower than before. In other words, if the height of the switchboard is the same, the number of units can be increased more than before. In addition, the cost of the switchboard is reduced by the absence of the wind guide unit.

Further, since the overhanging portion is formed at the lower portion of the front plate, it is easy to take in the air flowing from the bottom to the top for cooling, and the cooling efficiency is high.

Furthermore, since the cover is opened without side plates on both sides, the cooled air rises from both sides of the cover. Therefore, there is no need to provide a space as a duct behind the unit as in the related art, and the depth of the switchboard can be made smaller than in the related art.

[Brief description of the drawings]

FIG. 1A is a front view and FIG. 1B is a right side view of a unit group in a switchboard according to the present invention.

FIG. 2 shows three types of units for comparing the cooling efficiencies of the unit groups in the switchboard according to the present invention, and (a)
Is a perspective view of the unit A, (b) is a perspective view of the unit B,
(C) is a perspective view of the unit C.

FIGS. 3A and 3B relate to units for comparing the cooling efficiencies of a group of units in a switchboard according to the present invention.
7A and 7B are explanatory diagrams of the operation of the unit B, and FIGS.

FIG. 4 is a graph showing the temperature of each part of the units A to C for explaining the cooling efficiency of the unit group in the switchboard according to the present invention in comparison with that of another configuration.

FIG. 5 is an explanatory diagram for comparing a conventional unit group with a unit group of a switchboard according to the present invention.

FIG. 6 relates to a unit group in a conventional switchboard;
(A) is a front view, (b) is a right side view.

[Explanation of symbols]

 6 back panel 7 unit 8a top panel 8b front panel 8 cover 9 overhang

Claims (1)

[Claims] 1. A single back plate is provided with a plurality of top plates protruding horizontally toward the front face at substantially equal intervals in the vertical direction.
A front plate protruding vertically downward from the front end of each top plate is provided, and the vicinity of the lower end of the front plate is protruded forward to form an overhang, and both sides are opened without providing side plates. A switchboard comprising a unit group in which a plurality of units are stacked.