JPS6330167Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a ventilation system in a cubicle type switchboard having an opening/closing door.

In cubicle-type switchboards that house high-voltage power receiving equipment, etc., natural ventilation or forced ventilation is required to suppress the rise in temperature inside the box due to heating elements such as transformers installed inside the box.

The commonly used ventilation methods are
As shown in the figure, an air inlet 2 is provided in the base 1 of the box body, and outside air is allowed to flow in as shown by arrow A through a hole 3 provided in the bottom of the box, or an extrusion port 2 is provided in the door 4 as shown in Fig. 3. Either hole 5 (or a similar louver device) is provided through which outside air can flow into the box.

In the first method, the air inlet 2 is close to the top surface of the foundation 6 on which the box is installed, so it is not only susceptible to intrusion of rainwater, but also the size of the hole 3 depends on the structure inside the box and the installed equipment. Since there are restrictions on quantity, etc., there is a drawback that sufficient ventilation cannot be expected.

Further, in the second method, since the door surface is directly machined, it is difficult to maintain the flatness accuracy of the door surface.

The present invention seeks to provide a cubicle switchboard with an improved ventilation system that eliminates these drawbacks. Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a front view showing an embodiment of the present invention. Normally, multiple cubicle type switchboards as shown in the figure are used side by side, but in the figure one is shown for simplicity.
Only the number is shown. In the figure, 7 is a vertical protection plate according to the present invention, and 8 is a ventilation hole provided therein. Note that 9 indicates an exhaust tower.

FIG. 2 is an enlarged sectional view taken along line A-A' in FIG. 1. In the figure, the same parts as in FIG. 1 are given the same reference numerals. Reference numeral 10 denotes a first ventilation hole provided at the bottom of the door 4, through which outside air flows into the box. The lower bottom surface 8' of the vertical protection plate 7 is open, and outside air rises in the vertical direction through the first ventilation hole 10 and the lower bottom surface 8'. In the illustrated embodiment, the vertical protection plate 7 is arranged vertically in the form of a flat box (cuboid), with its front face facing the door 4, a second ventilation hole 8 provided in the rear face, and the rear face provided with the ventilation hole 8 turned into a box. It is fixed to the bottom plate 11 of the body. Note that the front surface of the protection plate 7 may be shorter than that shown in the figure. Since the upper surface of the protection plate 7 is closed, outside air flows into the box through the ventilation hole 10 of the door 4 and the ventilation hole 8 of the protection plate 7 as shown by arrow B. Note that 12 and 13 are dustproof covers that prevent dust and foreign matter from entering, and 14 indicates equipment such as a transformer. The front side of the protection plate 7 should be as close to the door 4 as possible, and the gap between it and the door 4 should be, for example, 10 mm.
Keep within millimeter.

Although FIGS. 1 and 2 also show the intake port 2 and the hole 3 in the bottom of the box according to the conventional method, this is for the purpose of explaining the conventional example. However, in some cases,
The present invention and the conventional method can also be used together.

FIG. 4 is a schematic diagram showing the structure of the door. FIG. 4A is a partial sectional view of the protection plate 7 seen from above. In the figure, 4' is the side surface of the door 4;
15 indicates the side wall of the box. FIG. 4B is an enlarged perspective view of the bottom of the door 4. FIG. In the figure, the ventilation hole 10 is shown as being formed by cutting a part of the bottom surface 4'' of the door 4, but it may be formed in a plurality of holes.

With the above configuration, the present invention has the following various remarkable effects.

(i) Since the hole is provided in the lower bottom surface 4'' of the door 4, there is almost no effect on maintaining accuracy in door processing.

(ii) Compared to the case where the intake port 2 is provided in the base 1 of the box body, the influence of rainwater intrusion is less.

(iii) The air inflow resistance is lower than that of conventional methods, and the ventilation effect is excellent.

(iv) By setting the height of the protective plate 7 appropriately, it is possible to prevent danger such as stepping into the inside of the box when the door 4 is opened.

(v) Compared to the conventional method shown in FIG. 2, the size of the ventilation holes is not restricted by the structure and installation equipment inside the box.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified and changed in various ways without departing from the gist of the invention as set forth in the claims for utility model registration.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along line A-A' in Fig. 1, Fig. 3 is a sectional view showing an example of the conventional method, and Fig. 4. A is a partial cross-sectional view seen from above the vertical protection plate, and Fig. 4 B is a
FIG. 3 is an enlarged perspective view of the lower bottom of the door. 4... Door, 10... First ventilation hole, 7... Vertical protection plate, 8... Second ventilation hole, 11... Box bottom plate.

Claims (1)

[Scope of utility model registration request] In a cubicle type power distribution board having an opening/closing door, a first ventilation hole is provided at the bottom of the door, the top surface is closed, the bottom surface is open, the front surface is close to the rear surface of the door, and the rear surface is fixed to the bottom of the box body. A cubicle type switchboard, wherein a second ventilation hole is provided on the rear surface of the vertical protection plate, and outside air from the first ventilation hole is caused to flow into the box through the second ventilation hole.