JPS6038319Y2 - Pressure relief device for electrical equipment stored in closed containers - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a pressure relief device for electrical equipment housed in a closed container.

If a ground fault or short circuit occurs in electrical equipment inside a sealed container, the gas inside the sealed container will cause an abnormal pressure rise, and in some cases the container may explode, so the increased pressure should be released immediately. , a pressure relief device is required to prevent the explosion of sealed containers.

Conventionally, there has been a pressure relief device of this type having the structure shown in FIG.

As shown in FIG. 1, the airtight container 1 has a flange 2 hermetically fixed.

A rupture disc 3 is attached to the flange 2 in airtight contact with a mounting cover 4.

Furthermore, a cover 5 is provided on the flange 2 to protect the rupture disc 3 from foreign objects such as flying stones from the outside, and is attached to the flange 2 with a small gap.

Next, to explain the operation with reference to Fig. 2, the closed container 1
If a ground fault or short circuit accident occurs in electrical equipment (not shown) inside the container, the gas pressure inside the sealed container will continue to rise due to the arc energy generated by the accident until the accident is cleared.

When this pressure exceeds a certain pressure value, the rupture disc 3 ruptures and the gas inside the closed container 1 is released from the gap between the cover 5 and the flange.

Since the conventional pressure relief device is configured as described above, in the event of an accident, gas is released from the gap between the cover 5 and the flange 2, so it can be quickly removed in the event of a large current ground fault or short circuit accident. , the gas could not be released, and there was a danger that the sealed container 1 would explode.

This invention was made in view of the drawbacks of the conventional devices as described above, and the purpose was to provide a pressure relief device that does not have the above-mentioned drawbacks. By providing holes, we provide a pressure relief device that can quickly release gas.

The invention will be explained with reference to the embodiments illustrated below.

Also in this invention, as shown in FIG.
The flange 2 is airtightly fixed to the flange 2, and the rupture disc 3 is in airtight contact with the flange 2 so as to close the center hole of the flange, and the rupture disc is attached with a cover 4, unlike the conventional one shown in Fig. 1. It's no different.

Also, the provision of a cover 5 for protecting the rupture disc 3 is similar to that shown in FIG. A metal plate 6 with a cap 5a is attached to the surface of the cover 5 facing the rupture plate 3.

7 is a small hole made in the fusible metal plate 6.

When a ground fault or a short-circuit accident occurs in equipment within the sealed container 1 and an arc is generated, the gas pressure within the sealed container 1 rapidly increases due to the arc energy until the accident is relieved.

The rupture disc 3 ruptures when a certain pressure value is exceeded, and the gas heated to a high temperature in the sealed container 1 by the arc passes through the center hole of the flange and passes through the fusible metal plate 6 attached opposite to the rupture disc 3. It also releases from hole 7.

When the arc energy is large, the gas is heated to a high temperature of 400°C or more, so the fusible metal plate 6 flows from around the hole 7.
At the beginning of melting, the discharge hole 5a opens and a large gas discharge flow path can be secured, so that in the event of a ground fault or short circuit accident in the closed container 1, the gas whose pressure has increased can be effectively discharged.

In the above embodiment, a fusible metal plate is attached to the cover 5 that protects the rupture disc 3, but even if a thin mesh net is attached to the cover 5, the same effect as that of the fusible metal plate can be obtained.

As described above, according to this invention, since the fusible metal plate 6 is attached to the surface of the cover 5 facing the rupture disc 3, an effective pressure relief device can be obtained without increasing the size of the conventional device.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional pressure relief device, Fig. 2 is a sectional view showing the operation of the conventional device, Fig. 3 is a sectional view showing an embodiment of the pressure relief device of this invention, and Fig. 4 is a sectional view showing the operation of the conventional pressure relief device. FIG. 4 is a sectional view showing the operation of the device of FIG. 3; 1... airtight container, 2... flange, 3
...Rupture disc, 4...Installation with cover, 5
...Cover, 5a...Discharge hole, 6...
... Fusible metal plate, 7 ... hole.

Claims (1)

[Scope of utility model registration request] A pressure relief device comprising a rupture disc on the flange of a sealed container housing electrical equipment and a cover covering the outside, characterized in that the cover is provided with a discharge hole closed with a fusible metal plate. Pressure relief device for electrical equipment stored in containers.