JPS6030170B2 - Top pressure relief type distribution box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a safe electrical distribution box with a simple structure and low cost that does not cause any harm to passersby or damage the equipment stored inside.

Traditionally used distribution boxes have doors only on the periphery, so if a short circuit occurs inside the box, the cables installed inside the box will be closed due to the abnormally high pressure and high temperature gas generated. In addition to damaging equipment such as heads and electrical switches, this high-temperature gas deforms or ruptures surrounding doors and releases pressure into the surrounding area, which not only damages the distribution box itself but also poses a hazard to passersby. There are major flaws such as giving.

The present invention aims to provide an invention that eliminates the conventional large defect losses at once with an inexpensive structure. The gist of the present invention is to close the top surface of a distribution box provided with a peripheral door to provide a pressure relief port A, and to form a short and small vertical waterproof frame on the outer plate around the pressure relief port A. A waterproof support frame having a cross-section of 100 mm is erected approximately in the center of the pressure relief port A with both ends fixed, and is opened upward during pressure relief so as to cover the upper part of the outer plate on the outside of the waterproof frame. A double door type pressure relief door is hinged, an elastic hanging plate is attached to the inner surface of one side of the pressure relief door, and the elastic hanging plate is normally attached to the bottom surface of the waterproof support frame to close the pressure relief port A. This upper pressure relief type distribution box is characterized in that a perforated steel plate is installed inside the distribution box to block the fully open □ surface of the pressure relief port A.

The present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view of the distribution box of this embodiment when the pressure is released, and FIG. 2 is a plan view of the distribution box under normal conditions. Attach a missing lock 2' to this to tightly close the surrounding door 2 at all times, and use the lock 2' as necessary.
' was removed to inspect the inside.

In the distribution box as described above, the present invention forms waterproof frames 3, 3' by welding short and small vertical rectangular frames to the upper parts of the front outer plate 1 and the rear outer plate 1', and each waterproof frame 3, A hinge 5 is attached to the upper part of the outer plates 1 and 1' on the outside of the frame 3' with support frames 4 and 4'.
, 5' are respectively attached, and the upper surface of the distribution box inside the waterproof frames 3, 3' is completely closed to form a pressure relief port A. 6
, 6' is the hinge axis.

Then, double door type pressure relief doors 7, 7' are attached to the above-mentioned hinges 5, 5' so as to cover the waterproof frames 3, 3'. , 7' are opened upward, and support punches 8, 8' are welded to the inner surface of one side of each pressure release door 7, 7' with welded metal 9, 9'. Metal elastic hook plates 10, 10 at the lower end of the
' with bolts 11, 11', and its tip 12,
12' is disposed on the lower surface of the waterproof support frame 13 at the top of the distribution box, so that the pressure relief port A is normally completely closed by the pressure relief door 797'.

The above-mentioned waterproof support 13 is a frame body with a cross-section of 2.0 mm, whose ends are welded to the waterproof frames 3, 3' between the left and right outer plates at the center of the upper closed part of the distribution box, and the lower surface of the frame body has the shape of Hook board 1
The pressure release door 7.
7' and the tips 14 and 1 of both pressure relief doors 7 and 7'.
4' is also bent downward and carried into the ]-shaped waterproof support frame 13, and as mentioned above, the upper opening of the distribution box, that is, the pressure relief OA, is always closed with the pressure relief doors 7 and 7'. There is. Furthermore, in the present invention, a large number of through holes 15, 15,
A perforated steel plate 16 with holes 15, ...... is arranged,
On the side, an L-shaped support 17 is fixed to the inner surface of the outer plate by welding or the like, and a perforated steel plate 16 is formed on the shoulder surface 17' of the support 17.
The peripheral green part of the perforated steel plate 16 is bolted with bolts 18, 18, and in the event of a short-circuit accident inside the box, powerful high-temperature gas is passed through the numerous through holes 15, 15, 15, etc. of the perforated steel plate 16. - The structure is such that the pressure is discharged upward from the box, and broken items from the equipment inside the box are caught by the perforated steel plate 16 so as not to be released to the outside. Furthermore, on the tops of the left and right rigid frames 19, 19 of the U-shaped waterproof support frame 13 at the top of the distribution box, and on the top of the box top waterproof frame 3, hollow sponge gaskets 20 are attached to the inner surface of the pressure relief door with adhesive or the like. 20 and the packings 21, 21 are pressed together,
It is preferable that the sponge packings 20, 21 are brought into pressure contact with the pressure release doors 7, 7' to prevent moisture from entering the box during normal times.

22 is a reinforcing frame attached to the inner surface of the upper part of the box, and 23 is a lifting ring.

With the above-described configuration, the distribution box of the present invention is normally in the third position.
As shown in the figure, the pressure release door at the top of the box is securely fixed to the waterproof support frame at the top of the box using a hook plate, and the surrounding door on the box side is also locked, so power distribution can continue without any hindrance. .

When a short circuit or grounding accident occurs in the distribution box, the abnormal high-pressure gas generated inside the box becomes a strong gas pressure and is released, but this release pressure is released through the many holes in the perforated steel plate at the top of the box. Apply strong pressure to the upper elastic hook plate, use its elasticity to bend the hook plate, remove it from the waterproof support frame, open the hinged pressure relief door upwards as shown in Figure 4, and release the pressure. Pressure is released from the top of the box directly upward through port A.

Therefore, unlike the conventional distribution box, there is no possibility of pressure being released from the surrounding door and posing a danger to passersby or workers. Furthermore, the fragments of the items inside the box that are damaged by the strong gas pressure are caught by the perforated steel plate at the top and remain inside the box, so there is no chance that the fragments will fly outside the box and cause injury to passersby, as was the case in the past. Absolutely nothing. In addition, because the pressure is released upward as described above, the surrounding door is safe and will not be deformed in any way. Therefore, after an accident, the surrounding door can be easily opened and closed to handle the accident, and the distribution box can be opened again after repair. There are also benefits that can be used. The present invention can provide the above-mentioned power distribution box with a simple structure and low cost, so it is an extremely effective and excellent invention for this type of power distribution.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a distribution box showing an embodiment of the present invention when the pressure is released, Fig. 2 is a plan view of the distribution box during normal operation, and Fig. 3 is a perspective view of the distribution box during pressure release.
Figure 4 is an enlarged sectional view taken along line x-x in the figure.
-x enlarged sectional view; FIG. 5 is an y-y enlarged sectional view of FIG. 1...Front outer panel of the distribution box, 2...Surrounding door, 5, 5'...
...Hinge, 6,6'...Hingle wisteria, 7,7'.
...Pressure release door, 10, IQ'...Elastic hook plate,
12, 12'... Tip of the hook plate, 13...
...Waterproof support frame, 16...Perforated steel plate having through holes 15, 20, 21...Sponge type packing, A...
...Pressure opening. Direction P' Figure O 2 Figure Offshore Figure 4 Figure J

Claims (1)

[Claims] 1 Open the top surface of the distribution box equipped with a surrounding door to provide a pressure relief port A, form a short vertical waterproof frame on the outer plate around the pressure relief port A, and secure both ends to this waterproof frame. A waterproof support frame with a cross section of ■ shape is constructed approximately in the center of the pressure relief port A, and a double door type vent is installed on the upper part of the outer plate outside the waterproof frame so as to cover the waterproof frame and open upward when the pressure is released. The pressure door is hinged, an elastic hook plate is attached to the inner surface of one side of the pressure relief door, and the elastic hook plate is normally hooked to the lower surface of the waterproof support frame to close the pressure relief port A. An upper pressure relief type distribution box characterized in that a perforated steel plate is installed inside the distribution box to block the entire opening surface of the pressure relief port A.