JPH0777481B2 - Switchgear with pressure relief mechanism - Google Patents

Description

Description: [Industrial application] The present invention relates to a switchgear with a pressure release mechanism for opening and closing an electric circuit.

[Prior Art] Inside a closed cable room inside a switchgear,
For example, when a short-circuit accident occurs, the arc generated at that time causes the pressure in the cable chamber to rise rapidly. Therefore, the cable chamber is provided with a pressure release mechanism for releasing the increased pressure to the outside. Some conventional pressure relief mechanisms have a structure in which a hole is provided in the wall of the cable chamber and the hole is closed by a door-shaped member having a rotatable hinge portion. In this case, when the pressure in the cable chamber suddenly rises, the door-like thing opens to the outside of the cable chamber due to the pressure, and the sudden pressure rise in the cable chamber is released to the outside.

[Problems to be Solved by the Invention] In the conventional opening / closing device with a pressure release mechanism, it is necessary to fix each of them by welding or bolts in order to provide a rotatable hinge between the door and the wall. Therefore, the conventional device has a problem that the work efficiency at the time of assembly is poor, the number of parts is large, and the device is expensive.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an opening / closing device with a pressure release mechanism that can be easily assembled with a simple structure and is inexpensive.

[Means for Solving the Problems] A switchgear with a pressure release mechanism according to the present invention includes a partition wall having at least one hole that separates a cable chamber and a switchgear chamber of the switchgear, and a switch of the partition wall. A pressure-release plate having a plurality of projections that abut the chamber-side surface to close the at least one hole and engage with the edge of the hole; and a pressure-release plate provided near the edge of the pressure-release plate and capable of bending and having a predetermined rigidity. A first fastening means having a first fastening metal fitting for holding one edge of at least one hole of the separation wall; and the first fastening means near an edge of the pressure-release plate. Has a second fastening member which is provided at a position facing each other and which is bendable and has a rigidity lower than that of the first fastening member, and holds the other edge of at least one hole of the separation wall. A second engaging means, wherein the pressure relief plate is configured to operate when the cable chamber has an abnormally high pressure. After leaving the second fastening bracket, configured to pop out into the switch chamber while rotating desorbed from the first fastening brackets.

[Operation] The pressure release mechanism in the present invention is
When the arc generated due to an accident or the like rapidly increases the pressure in the cable chamber, the pressure release plate is disengaged from the separation wall to the switch chamber side by the second engaging means. Next, when the first fastening means is disengaged from the hole edge of the separation wall, the pressure release plate is completely released from the separation wall, and the increased pressure in the cable chamber is released to the outside.

[Example] An example of an opening / closing device with a pressure release mechanism of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a pressure release mechanism portion of a switchgear with a pressure release mechanism according to an embodiment, and FIGS. 2 and 3 are sectional views taken along lines II-II and III-III of FIG. 1, respectively. 4 is a cross-sectional view showing the operation of the pressure release mechanism of FIG. 3, and FIG. 5 is a perspective view showing the entire opening / closing device with the pressure release mechanism of FIG.

The switchgear with a pressure release mechanism of the present embodiment is constituted by a switchgear chamber 10 in which a switchgear 10a is arranged as shown in FIG. 5, and a cable chamber 11,11,11 connected to a cable of an electric line. ing. The switch room 10 and the cable rooms 11, 11, 11 are separated walls 2, 2,
Separated by two. The partition walls 2, 2, 2 are provided with rectangular holes 2a, 2a, 2a for connecting the switch chamber 10 and the cable chambers 11, 11, 11 respectively. FIG. 1 is a front view of one pressure relief mechanism section as seen from the cable chamber side. As shown in FIG. 1, the pressure relief plate 1 is provided in the hole 2a, and the pressure relief plate 1 has the hole 2a. The shape is larger, and it abuts the switch chamber 10 side of the separation wall 2 to close the entire hole 2a. Further, in order to prevent the pressure release plate 1 from moving along the surface of the separation wall 2 of the pressure release plate 1, the pressure release plate 1 is provided with projections 3, 3, 3, 3 which engage with the four corners of the hole 2a. ing. Further, a first engaging means and a second engaging means for engaging the pressure release plate 1 and the separating wall 2 are provided in the vicinity of the central portions of both edges of the pressure release plate 1 in the longitudinal direction so as to face each other. There is. As shown in FIG. 2, the first fastening means has the first fastening metal fitting 6 attached to the pressure-release plate 1 via the first spacer 9 by the first attachment bolt 7. On the other hand, as shown in FIG. 3, the second fastening means has the second fastening metal fitting 4 mounted by the second mounting bolt 5 via the second spacer 8. However, the second fastening member 4 is made of a material such as a thin copper plate having a rigidity lower than that of the first fastening member 6. On the ceiling wall of the switch room 10 above each cable room 11,11,11, an opening 1 communicating with the outside covered with gold steel is provided directly above each pressure relief plate 1,1,1.
2,12,12 are provided respectively.

The operation of the opening / closing device with a pressure release mechanism of the present invention having the above-described configuration will be described. If a short-circuit accident occurs in any one of the cable chambers 11, the pressure in the cable chamber 11 rapidly rises due to the arc generated at this time.
Therefore, the pressing force in the direction of arrow A shown in FIG.
Join in. For this reason, as shown in FIG. 4, the second fastening member 4 does not resist the pressing force in the direction of arrow A and is bent,
The pressure relief plate 1 rotates toward the switch chamber 10 side around the first engaging means. Then, finally, the first engaging means also comes off the edge of the hole 2a, and the pressure release plate 1 jumps out into the switch chamber 10. Therefore, the increased pressure in the cable chamber 10 is increased by the hole 2a of the separation wall 2.
Then, the pressure is released to the outside through the openings 12, 12, 12 of the ceiling wall of the switch room 10. At this time, since the pressure-release plate 1 jumps out while rotating, it is possible to limit the jumping-out direction to some extent and reduce damage to the inside of the device. Each pressure relief plate 1,1,1 has a shape larger than the corresponding respective hole 2a, 2a, 2a, and this pressure relief plate 1,1,1 is contacted from the switch chamber 10 side of the separation wall 2. Since they are in contact with each other, the pressure relief plates 1, 1, 1 have a non-return structure that does not enter the cable chambers 11, 11, 11. For this reason, the holes 2a, 2a of the separation wall 2 leading from the switch room 10 to the other normal cable rooms 11, 11 at the time of the above abnormality are blocked by the respective pressure relief plates 1, 1 and the occurrence of abnormality occurs. The increased pressure in the cable chamber 11 is not released into the normal cable chambers 11, 11. Since wire meshes are attached to the openings 12, 12, 12 provided on the ceiling wall of the switch room 10, the pressure relief plate 1 that has popped out is not discharged to the outside of the switchgear.

In the above embodiment, the protrusions 3, 3, 3, 3 are provided at the four corners of the pressure relief plate 1 to restrict the movement of the pressure relief plate 1 along the surface of the separation wall 2, but the protrusions 3, 3, 3, Instead of 3, the pressure relief plate 1 may be provided with bolts at four corners, and the heads of the bolts may be engaged with the four corners of the hole 2a of the separation wall 2. Further, the first fastening means uses the clip 17 having the shape shown in FIG.
By appropriately providing the spring plate 18 having the shape shown in the figure to the pressure-release plate 1, the pressure-release plate can be more easily attached to the hole 2a of the separation wall 2.

[Effects of the Invention] As described above, according to the present invention, by providing the pressure-release plate with the first fastening means and the second fastening means having a simple structure, the pressure-release board can be easily attached to the hole of the separation wall. Therefore, it is possible to provide a device that has good work efficiency, is inexpensive, and has high safety.

[Brief description of drawings]

FIG. 1 is a front view of a pressure release mechanism showing an embodiment of a switchgear with a pressure release mechanism of the present invention, FIG. 2 is a partial sectional view taken along line II-II of FIG. 1, and FIG. 3 is FIG. III-III line sectional view of FIG. 4, FIG. 4 is a sectional view of the pressure relief mechanism of FIG. 3 during operation, FIG.
FIG. 6 is an overall perspective view showing an embodiment of the opening / closing device with a pressure release mechanism of the present invention, and FIGS. 6 and 7 are partial cross-sectional views showing other embodiments of the opening / closing device of the pressure release mechanism of the present invention. . In the figure, 1 is a pressure release plate, 2 is a separation wall, 3 is a protrusion, 4 is a second fastening metal fitting, and 6 is a first fastening metal fitting. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A separation wall having at least one hole which separates a cable chamber and a switch chamber of a switch device, and abuts the surface of the separation wall on the switch chamber side to close the at least one hole. A pressure-release plate having a plurality of protrusions that engage with edges, a bendable first fastening member provided near an edge of the pressure-release plate and having a predetermined rigidity, and at least one hole of the separation wall. A first engaging means for sandwiching one of the hole edges, provided at a position facing the first engaging means in the vicinity of the edge portion of the pressure-release plate, and being bendable from the first engaging metal fitting. A second fastening member having a second fastening metal fitting having a small rigidity, and a second fastening means for holding the other edge of at least one hole of the separation wall; and when the cable chamber has an abnormally high pressure, After the pressure release plate is separated from the second engaging metal fitting, it is separated from the first engaging metal fitting. While rotating the switch pressure relief mechanism opening-closing apparatus that pops out chamber.