JP6376904B2 - Closed switchboard - Google Patents

Description

  The present invention relates to a closed switchboard that houses electrical equipment such as a main circuit switch, a protection device, and a monitoring and control device.

Due to the impact of recent earthquakes and tsunamis, awareness of safety has increased, and closed switchboards for various plant facilities such as nuclear power are also required to have improved earthquake resistance. It is required to maintain its function as a malfunction and not be damaged.
As a technology for improving the seismic resistance of an existing closed switchboard, for example, in a closed switchboard in which electrical equipment is housed in a box, a vibration absorbing device comprising a viscous fluid and a weight in the viscous fluid is provided on the ceiling of the box. By providing, there is one that can absorb vibrations of a box that resonates due to an earthquake, and can easily increase earthquake resistance using an existing box without increasing the arrangement area (see Patent Document 1). In addition, by attaching a fixed seat member to the frame that forms the opening of the panel and fixing the door to the fixed seat member with a fastener, it is possible to ensure earthquake resistance regardless of the direction of vibration, and the structure is simple. In addition, even existing boards such as switchboards can reliably improve the earthquake resistance without a large-scale repair (see Patent Document 2).

JP-A-3-49508 (page 3, FIG. 1) JP 2010-183717 A (first page, FIG. 1)

  In the technique such as Patent Document 1, the seismic performance is improved by installing a vibration damping device equivalent to the sloshing damper on the ceiling of the closed switchboard. However, it is difficult to install a plurality of sloshing dampers on the ceiling space of the closed switchboard. Furthermore, the use of a weight increases the number of components and there are problems with maintainability. In addition, as in Patent Document 2, the improvement of the earthquake resistance performance by adding a reinforcing member or a fixing member to the panel housing is considered to be an effective technique if applied at the time of panel manufacture, but it reinforces the existing panel. In doing so, great care must be taken to avoid damaging the on-board equipment and wiring, and there has been a problem that is very laborious.

  The present invention has been made to solve the above-described problems, and provides a closed switchboard that can be easily applied to an existing closed switchboard and can be reduced in height. The purpose is to do.

The closed switchboard according to the present invention is a closed switchboard in which electrical equipment is housed in a casing, wherein the damper container is provided with a partition member that partitions the interior into a plurality of rooms on the ceiling portion of the casing, and the damper A sloshing damper comprising a predetermined amount of viscous fluid housed in the plurality of chambers in the container, wherein the damper container is formed in a regular polygon in plan view, and the partition member includes the regular member. It consists of the partition plate installed so that the center point of a polygon and the corner | angular part of the said regular polygon may be connected .

According to the present invention, a sloshing damper comprising a damper container provided with a partition member for partitioning the interior into a plurality of rooms and a predetermined amount of viscous fluid housed in the plurality of rooms in the damper container is provided. Since the seismic resistance is strengthened, the structure is simple and the height can be easily reduced, so that the installation is simple and the effect that it can be easily applied to an existing closed switchboard is obtained . The partition member is composed of a partition plate installed so as to connect the center point of the regular polygon of the damper container formed in a regular polygon and the corner of the regular polygon, thereby further enhancing vibration resistance. Can do.

It is a perspective view which shows roughly the sloshing damper used for the closed switchboard by Embodiment 1 of this invention. It is a perspective view which shows roughly the external appearance of the closed switchboard of Embodiment 1 which installed the sloshing damper shown in FIG. It is a top-plate processing drawing of the closed switchboard shown in FIG. It is a drilling process figure of the damper outer container of the sloshing damper shown in FIG. It is a perspective view which shows the L-shaped metal fitting which fixes the sloshing damper and closed switchboard shown in FIG. It is a perspective view which shows the damper base shown in FIG. It is a top view which shows roughly the structure of the damper container used for the closed switchboard by Embodiment 2 of this invention.

Embodiment 1 FIG.
1 is a perspective view schematically showing a sloshing damper used in a closed switchboard according to Embodiment 1 of the present invention. FIG. 2 is a schematic view of the appearance of the closed switchboard according to Embodiment 1 in which the sloshing damper shown in FIG. 1 is installed. It is a perspective view shown. In the figure, the sloshing damper 10 has a double structure in which a damper container 12 is installed in a damper outer container 11. As a specific structure inside the damper outer container 11, a damper container 12 and a damper base 13 for fixing the damper container 12 fixed by welding are attached to the damper outer container 11 with bolts, nuts, rivets or the like. It fixes with the fixing means (illustration omitted). The damper outer container 11 is installed and fixed on the upper surface of the top plate 21 of the casing 20 constituting the closed switchboard by fixing means such as bolts / nuts or welding or rivets.

  Inside the damper container 12 is provided a partition plate 121 as a partition member for partitioning the internal space into a plurality of (in this case, two) chambers 12a, and each chamber 12a has a viscous fluid (illustrated, for example, silicone oil). (Omitted) is stored in a predetermined amount. By providing the partition plate 121, the same effect as that obtained by installing a plurality of sloshing dampers on the ceiling of the housing 20 can be achieved. In the example of FIG. 1, the interior of the damper container 12 is partitioned into two chambers 12 a having an equal volume by a single partition plate 121, so two sloshing dampers having a half volume of the damper container 12 are arranged side by side. Although each room 12a is independent, it is easy to adjust the amount of viscous fluid accommodated in the chamber 12a and finely adjust the attenuation.

  The type of the viscous fluid to be enclosed in the damper container 12 is not particularly limited, and for example, various oils such as insulating oil, liquid resin, and water can be appropriately selected and used. Further, the amount of the viscous fluid stored in each room 12a divided inside the damper container 12 is, for example, about 1/3 of the height of the damper container 12, and includes a casing 20 including internal devices not shown. It may be adjusted so as to obtain a predetermined additional attenuation amount that is calculated in advance by a known technique in consideration of the natural frequency. Note that a plurality of unit doors 22, a duct door 23, and the like are provided on the front surface portion of the casing 20 constituting the closed switchboard.

Next, with reference to FIG. 3 to FIG. 6, a description will be given of an example of a method of installing a sloshing damper with respect to a closed switchboard by a simple structure in which an L-shaped bracket is used to fix the sloshing damper with a bolt / nut. 3 is a top plate processing diagram of the closed switchboard shown in FIG. 2, FIG. 4 is a drilling diagram of the outer container of the sloshing damper shown in FIG. 2, and FIG. 5 is an L for fixing the sloshing damper and the closed switchboard shown in FIG. FIG. 6 is a perspective view showing the damper base shown in FIG. 2.
As shown in FIG. 5, the L-shaped metal fitting 14 for fixing the damper outer container 11 to the top plate 21 of the housing 20 has an L-shaped cross section and a predetermined number of bolt holes 14 a provided on the bottom side. Bolt holes 14 b are provided on the sides, and are arranged at four locations around the damper outer container 11. On the other hand, the rectangular top plate 21 of the closed switchboard is provided with bolt holes 21a for fixing the bottom sides of the four L-shaped brackets 14 to the inside of each side of the top plate 21 as shown in FIG. The bolt hole 21 a of the top plate 21 corresponds to the bolt hole 14 a on the bottom side of the L-shaped metal fitting 14.

  As shown in FIG. 4, bolt holes 11a corresponding to the bolt holes 14b on the vertical side of the L-shaped metal fitting 14 are provided in the lower portions of the four side walls of the box-shaped damper outer container 11, and further above the bolt holes 11a. Is provided with a bolt hole 11b corresponding to the bolt hole 13a of the damper base 13 shown in FIG. In this example, the damper container 12 is fixed to the damper base 13 in advance by welding and filled with a viscous fluid, and the damper base 13 is configured to be fixed to the inner peripheral surface side of the damper outer container 11. As a fixing method using bolts, the bottom hole of the top plate 21 and the L-shaped bracket 14 is fixed by matching the bolt hole 14a on the bottom side of the L-shaped bracket 14 with the bolt hole 21a of the top panel 21 of the closed switchboard. The damper hole 11 and the L-shaped metal fitting 14 are fixed with bolts and nuts by aligning the bolt hole 11a provided on the side surface with the bolt hole 14b at the vertical side of the L-shaped metal fitting 14. Further, the bolt hole 11 b of the damper outer container 11 and the bolt hole 13 a provided on the side surface of the damper base 13 are matched to fix the damper base 13 to the inner peripheral portion of the damper outer container 11 with bolts and nuts (not shown).

  The upper surface of the damper outer container 11 is desirably a lid that can be opened and closed, for example, for attachment to the top plate 21, attachment of the damper container 12, or maintenance. The damper container 12 may be fixed to the damper base 13 in advance, or may be fixed to the damper base 13 later. Further, the damper base 13 may be configured integrally with the damper outer container 11 from the beginning as a floor member constituting the bottom plate of the damper outer container 11. Further, the damper outer container 11 can be omitted. The damper container 12 is not limited to a quadrangle, and may be, for example, a circle or an ellipse. A plurality of partition plates 121 may be provided.

  In the first embodiment configured as described above, a sloshing damper in which a viscous fluid is sealed in a damper container 12 that is partitioned into two chambers 12a by a partition member 121 is fixed on the top plate 21 of the closed switchboard. As a result, the viscous fluid moves in the direction opposite to the direction of the vibration applied to the housing 20 during the vibration of the earthquake, and a damper action that suppresses the vibration of the excitation force is generated, and the vibration applied to the housing 20 by the damper action. Is suppressed, and the seismic performance of the closed switchboard can be improved. For this reason, the fall of the closed switchboard and the failure of internal equipment due to the influence of shaking such as an earthquake or tsunami can be prevented. In addition, since the structure is simple and the height can be easily reduced, it is easy to assemble and install the closed switchboard, and it is easy to attach to the existing closed switchboard. Moreover, by providing the sloshing damper on the ceiling part of the closed switchboard, the seismic performance can be improved without causing the door of the closed switchboard to be opened and closed and the internal equipment to be hindered. In addition, since the two chambers 12a are provided inside the damper container 12 by the partition member 121, the number of members can be reduced as compared with the case where two damper containers are provided, and there is an advantage that installation effort is not required.

Embodiment 2. FIG.
FIG. 7 is a top view schematically showing the structure of the damper container used in the closed switchboard according to the second embodiment of the present invention. In the drawing, the outer shape of the damper container 12 as viewed from above is formed in a substantially regular hexagonal shape, and a partition plate 121 as a partition member installed so as to connect the center point of the regular hexagon and the corner of the regular hexagon. Thus, the interior is divided into six rooms 12a having a regular triangular shape independent of each other. Here, the case of a substantially regular hexagonal shape will be described, but the same applies to a regular polygonal shape of a regular triangle or more. In addition, the inside of the substantially regular hexagonal shape is divided into six rooms 12a having a regular triangle shape, but if the outer shape is a substantially regular hexagonal shape, the interior is made into three parallelogram shaped rooms, or Two trapezoidal rooms may be used. Further, the outer shape does not necessarily have to be a geometrically perfect regular polygon, and can be modified such that the corners of each room 12a are formed in an arc shape. Other configurations are the same as those of the first embodiment.

  In the second embodiment configured as described above, the damper container 12 is formed into a regular polygonal shape in plan view, and the interior thereof is symmetrical with respect to the center of the damper container 12, in this case, six chambers 12a having a regular triangular shape. By dividing and increasing the number of partition walls made up of the partition plates 121, it is possible to improve the dissipating property of the breaking energy with respect to the sloshing wave generated in the viscous fluid by the earthquake. Damping of the vibration is due to energy dissipation of breaking waves due to sloshing, and the damping effect is improved by increasing the dissipating property as described above. In addition, since six regular triangular rooms are equally provided in the circumferential direction, the damper action occurs in the same manner regardless of the direction of the shaking of the earthquake, so that the seismic performance against the deviation of the shaking direction is improved. .

  It should be noted that within the scope of the present invention, a part or all of each embodiment can be freely combined, or each embodiment can be appropriately modified or omitted.

  10 Sloshing Damper, 11 Damper External Container, 11a Bolt Hole, 11b Bolt Hole, 12 Damper Container, 12a Room, 121 Partition Plate, 13 Damper Base, 13a Bolt Hole, 14 L-shaped Bracket, 14a Bolt Hole, 14b Bolt Hole, 20 Case, 21 Top plate, 21a Bolt hole, 22 Unit door, 23 Duct door.

Claims (2)

In a closed switchboard in which electrical equipment is housed in a housing, a damper container provided with a partition member for partitioning the interior into a plurality of rooms on the ceiling of the housing, and the plurality of rooms in the damper container A sloshing damper comprising a predetermined amount of viscous fluid stored therein, wherein the damper container is formed in a regular polygon in plan view, and the partition member includes a center point of the regular polygon and the regular polygon A closed switchboard comprising a partition plate installed so as to connect polygonal corners . The damper container is formed in a regular hexagon in plan view, and the partition member is formed of a partition plate installed so as to connect a center point of the regular hexagon and a corner of the regular hexagon. The closed switchboard according to claim 1.

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