JP2020108241A - Closed type switchboard - Google Patents

Abstract

To provide a closed type switchboard capable of suppressing vibration of a fastening portion and operating a mounted device normally even if an external force due to the vibration such as an earthquake is applied.SOLUTION: A closed type switchboard includes a housing 2, a mounted device 4 mounted on this housing 2, a faceplate 5 that becomes a fastening portion for fixing the mounted device 4 to the housing 2, and a reinforcement member 6 for reinforcing the fixing between the faceplate 5 and the housing 2.SELECTED DRAWING: Figure 1

Description

The present application relates to a closed switchboard.

Due to the effects of the Fukushima Daiichi Nuclear Power Plant accident in 2011, new regulatory standards for nuclear power plants were enforced in 2013. This new regulatory standard requires the multiplexing and decentralization of on-site power supplies and power boards as a measure to prevent severe accidents (SA). The new regulatory standards also call for measures against aircraft collisions as terrorism. As a result, as a backup measure to improve the reliability of intentional aircraft collisions with the reactor building, in nuclear power plants, emergency control rooms, cooling pumps, and specific serious accidents equipped with alternative power sources are dealt with. The introduction of facilities (hereinafter referred to as special weight facilities) was made mandatory.

Since the building of the special weight facility is buried in the ground, it is more robust and has a higher natural frequency than the existing building installed on the ground. For this reason, the closed switchboard installed in the special weight facility needs to have higher rigidity and higher natural frequency than before in order to prevent resonance with the building of the special weight facility.

As a method of increasing the rigidity of a closed type switchboard, a method of providing a reinforcing frame on the housing of the closed type switchboard is disclosed (for example, refer to Patent Documents 1 and 2).

JP-A-2-269406 JP-A-3-74116

In a closed type switchboard to which mounted devices are fixed by using a case that uses a face plate or the like as a fastening member (hereinafter, referred to as a fastening portion), the rigidity of the case can be increased by a conventional method. However, if the mounted device is simply fixed to the housing using the fastening portion having low rigidity, the vibration may be amplified at the fastening portion due to vibration such as an earthquake. There is a problem that the mounted device does not operate normally when the fastening portion vibrates greatly.

The present application has been made in order to solve the above-mentioned problems, and in a closed type switchboard in which a mounting device is fixed to a housing by using a fastening portion, vibration of the fastening portion is generated even if external force due to vibration such as an earthquake is applied. It is an object of the present invention to provide a closed type switchboard which can suppress the noise and operate the mounted equipment normally.

A closed type switchboard according to the present application includes a housing, a mounted device mounted on the housing, a fastening portion that fastens the housing and the mounted equipment, and a reinforcing member that reinforces the fixing of the fastening portion and the housing. It is equipped with.

Since the closed type switchboard of the present application includes the reinforcing member that reinforces the fixing of the fastening portion and the housing, the rigidity of the fastening portion can be increased, and the fastening portion can be prevented from vibrating due to vibration such as an earthquake. The onboard equipment can operate normally.

FIG. 3 is a perspective view showing the closed type switchboard according to the first embodiment. 5 is a front view showing a face plate of a closed switchboard according to a second embodiment. It is a perspective view which shows the closed type switchboard which concerns on Embodiment 3. It is a perspective view which shows the closed type switchboard which concerns on Embodiment 4. It is a perspective view which shows the closed type switchboard which concerns on Embodiment 5.

Hereinafter, a closed type switchboard according to an embodiment for carrying out the present application will be described in detail with reference to the drawings. In each figure, the same reference numerals indicate the same or corresponding parts. In many cases, a closed type switchboard actually includes a plurality of mounted devices, but for simplicity of description, only one mounted device is shown, and other parts are omitted.

Embodiment 1.
FIG. 1 is a perspective view showing a closed type switchboard according to the first embodiment. In FIG. 1, a closed type switchboard 1 has a box-shaped housing 2, and a circuit breaker, which is a mounted device 4, is inserted through an opening 3 provided in the housing 2. A face plate 5, which is a fastening portion, is fastened to the mounted device 4. The mounted device 4 is fixed to the housing 2 using a face plate 5. A reinforcing frame (not shown) or the like may be provided inside the housing 2. The housing 2, face plate 5, reinforcing frame and the like are generally made of iron. The circuit breaker, which is the on-board device 4, has an internal breaking mechanism for breaking the current path. The face plate 5 does not include a display unit and an operation unit.

On the outside of the face plate 5, that is, on the surface of the face plate opposite to the surface facing the mounted device 4, a flat plate-shaped reinforcing member 6 is provided so as to cover almost the entire surface of the face plate 5. The reinforcing member 6 is made of a metal such as iron, and preferably has a rigidity equal to or higher than the rigidity of the face plate 5. For example, when the face plate 5 and the reinforcing member 6 are made of the same iron, it is preferable that the thickness of the reinforcing member 6 is equal to or larger than the thickness of the face plate 5. Further, the reinforcing member 6 is fastened to the housing 2 with a bolt at a bolt fixing point 7 so that the face plate 5 is firmly fixed to the housing 2.

In the closed type switchboard configured as described above, since the face plate 5 as the fastening portion is reinforced by the reinforcing member 6 and is firmly fixed to the housing 2, even if an external force due to vibration such as an earthquake is applied, the face plate 5 is Vibration can be suppressed. As a result, the mounted device 4 can be operated normally.

On the other hand, when the face plate is not reinforced, when an external force due to vibration such as an earthquake is applied, the vibration is amplified by the face plate having low rigidity, and the amplified vibration is also propagated to the mounted device. As a result, defects occur in electronic components, electrical joints, mechanical joints, and the like inside the mounted device. For example, due to vibration of the mounted device, operation stop or malfunction of electronic parts may occur, wire breakage may occur in electrical joints, loosening of joints may occur in mechanical joints, and parts may fall out. Therefore, the mounted device may not operate normally.

In this embodiment, the reinforcing member 6 has a flat plate shape, but may have any shape as long as the rigidity of the face plate can be increased.

Further, in the case of the conventional closed type switchboard, the face plate 5 may be provided with a handle for attaching/detaching mounted equipment on the entire surface thereof. In the present embodiment, it is preferable that the protruding distance of the reinforcing member 6 from the face plate is equal to or less than the protruding distance of the conventional handle. If the protrusion distance of the reinforcing member 6 from the face plate is the same as or less than the protrusion distance of the conventional handle, the existing closed type switchboard without the reinforcing member 6 is actually used when replacing the device in the existing facility. Can be replaced by a closed switchboard in the form of

In this embodiment, metal such as iron is used as the material of the reinforcing member, but another material may be used.

Embodiment 2.
In the closed-type switchboard according to the first embodiment, an example of the circuit breaker is shown as the mounted device. In this circuit breaker, the face plate is not provided with a display portion and an operating portion, and the reinforcing member is a flat plate-like member that covers almost the entire face plate. The closed switchboard according to the second embodiment includes a switch as an on-board device. This switch is provided with an opening/closing mechanism inside, and a face plate is provided with a display unit, an operating unit of the opening/closing mechanism, and the like.

FIG. 2 is a front view showing a face plate attached to the closed type switchboard according to the present embodiment. In FIG. 2, the face plate 5 is provided with a rating nameplate 10, a caution nameplate 11, a manual opening/closing section 12, and an operation display section 13 as a display section or an operation section. The reinforcing member 6 of the present embodiment has a lattice shape, and is provided at a place where the rating nameplate 10, the caution nameplate 11, the manual opening/closing part 12, and the operation display part 13 are not provided. In other words, the reinforcing member 6 of this embodiment is provided at a position avoiding the display section and the operation section. In other words, the reinforcing member 6 has an opening, and the opening is provided at a position corresponding to the display section and the operation section. The reinforcing member 6 preferably has the same rigidity as or higher than the rigidity of the face plate 5. Further, as in the first embodiment, the reinforcing member 6 is connected to the housing 2 with a bolt at the position of the bolt fixing point 7 so as to firmly fix the face plate 5 to the housing 2. Further, the reinforcing member 6 is also fixed to the face plate 5 at a position of another bolt fixing point 14 for fixing only the face plate 5.

In the closed type switchboard configured as described above, since the face plate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2 as in the first embodiment, external force due to vibration such as an earthquake is applied. However, the vibration of the face plate can be suppressed. As a result, the mounted device 4 can be operated normally.

In addition, since the reinforcing member 6 in the present embodiment is provided in a place without the rating nameplate 10, the caution nameplate 11, the manual opening/closing section 12, and the operation display section 13, the confirmation of the model number of the mounted device 4 and the operation status are performed. In addition to the confirmation, the manual opening/closing unit 12 can be operated. Further, since the reinforcing member 6 is also fixed to the face plate 5 at the position of another bolt fixing point 14 for fixing to the face plate 5, the reinforcing member 6 can be attached to and removed from the housing integrally with the face plate 5. At the same time, it is possible to add more after installing the closed type switchboard without the reinforcing member.

Embodiment 3.
FIG. 3 is a perspective view showing a closed type switchboard according to the third embodiment. The closed switchboard according to the present embodiment is fastened to a structural member of a building in which the closed switchboard is installed. In general, a building in which a closed switchboard is installed has higher rigidity than a housing of the closed switchboard.

Referring to FIG. 3, in the closed type switchboard 1 according to the present embodiment, a box-shaped casing 2 has a face plate 5 on which a mounted device 4 is fixed. A flat plate-shaped reinforcing member 6 is provided outside the face plate 5. Similar to the first embodiment, the reinforcing member 6 is fastened to the housing 2 with a bolt at a bolt fixing point 7 so that the face plate 5 is firmly fixed to the housing 2. Further, the reinforcing member 6 is provided with an extension portion 17 for fastening to the floor 15 and the wall 16 of the building which is the outside of the housing 2, and the extension portion 17 is used to bolt the floor 15 and the wall 16 to the bolt respectively. It is fixed at the position of the fixed point 18. The extending portion 17 extends from the housing 2 of the closed switchboard 1 and is configured to come into contact with the floor 15 and the wall 16 of the building.

In the closed type switchboard configured as described above, since the face plate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2 as in the first embodiment, external force due to vibration such as an earthquake is applied. However, the vibration of the face plate can be suppressed. As a result, the mounted device 4 can be operated normally.

Further, since the reinforcing member 6 in the present embodiment is also fastened to the structural member of the building in which the closed switchboard is installed, not only the rigidity of the housing but also the high rigidity of the building can be enjoyed. ..

In the present embodiment, the example in which the reinforcing member 6 is fastened to both the floor and the wall of the building is shown, but either one may be fastened. Further, it is not necessarily required to be fastened to the structural member of the building, and another structural member may be used as long as the structural member has higher rigidity than the casing of the closed type switchboard.

Fourth Embodiment
FIG. 4 is a perspective view showing a closed type switchboard according to the fourth embodiment. In the closed switchboard according to the present embodiment, a face plate, which is a fastening portion, is fixed to the housing inside the box-shaped housing.

Referring to FIG. 4, in the closed type switchboard 1 according to the present embodiment, a mounted device 4 is fixed inside a box-shaped housing 2 by using a face plate 5 which is a fastening portion. One surface of the box-shaped housing 2 is an opening 3, and the mounted device 4 is inserted into the housing 2 through the opening 3. The mounted device 4 is fastened to the face plate 5, and is arranged behind the face plate 5 as viewed from the opening 3. A door 20 is fastened to the opening 3 via a hinge 21. The closed type switchboard 1 is used with the door 20 closed.

A flat plate-shaped reinforcing member 6 is provided on the opening 3 side of the face plate 5. The reinforcing member 6 is fixed to the face plate 5 with bolts at the bolt fixing points 22 and at the bolt fixing points 7 so as to firmly fix the face plate 5 to the housing 2. Is also fastened to the housing 2.

In the closed type switchboard configured as described above, the face plate 5 is reinforced by the reinforcing member 6 and firmly fixed to the housing 2, so that the face plate vibration is suppressed even when an external force due to vibration such as an earthquake is applied. can do. As a result, the mounted device 4 can be operated normally.

Embodiment 5.
FIG. 5 is a perspective view showing a closed type switchboard according to the fifth embodiment. In the closed type switchboard according to the present embodiment, the fastening portion is formed of a door. The closed switchboard according to the present embodiment includes an on-board device installed on a door.

In FIG. 5, the closed switchboard 1 of the present embodiment has a box-shaped housing 2, and a door 20 is attached to an opening (not shown) provided in the housing 2. The protective relay 23 that is an on-board device is fixed to the door 20 that is a fastening portion. This protective relay 23 monitors the state of the circuit and sends a control signal such as circuit interruption in the event of an abnormality.

The door 20 is fastened to the housing 2 via a hinge 21. The door 20 to which the protective relay 23 is fixed has a meter 24 for measuring and displaying current, voltage, etc., a test terminal 25 for testing, measuring, and calibrating the protective relay 23, and a lamp showing the open/closed state of the circuit breaker. 26 and a switch 27 for switching circuits. The reinforcing member 6 of the present embodiment has an H-shape, and is provided at a place where there is no display unit or operation unit such as the meter 24, the test terminal 25, the lamp 26, and the switch 27. In other words, the reinforcing member 6 of this embodiment is provided at a position avoiding the display section and the operation section. In other words, the reinforcing member 6 has an opening, and the opening is provided at a position corresponding to the display section and the operation section. The reinforcing member 6 is fastened to the door 20 and the housing 2 with a bolt at a bolt fixing point 7 so as to firmly fix the door 20 to the housing 2. The reinforcing member 6 does not necessarily have to be H-shaped, and may have any shape as long as it is a shape that avoids various devices attached to the door.

In the closed switchboard configured as described above, the door 20 that is the fastening portion is reinforced by the reinforcing member 6 and is firmly fixed to the housing 2. Therefore, even if external force due to vibration such as an earthquake is applied, Vibration can be suppressed. As a result, the protective relay 23, which is an on-board device, can be operated normally.

Further, since the reinforcing member 6 in the present embodiment is provided in a place where various devices are not provided, it is possible to check the operation status of the protective relay 23 and to operate the operation unit such as a switch.

In Embodiments 1 to 4, the fastening portion is an example of a face plate, and in Embodiment 5, the fastening portion is an example of a door. However, the main body of the mounted device is fastened to the housing 2. The fastening portion may be any other member as long as it is a member for doing so.

Although the present application describes various exemplary embodiments, the various features, aspects, and functions described in one or more embodiments are only applicable to the particular embodiment. Instead, it is applicable to the embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and at least one component is extracted and combined with the components of other embodiments.

1 closed type switchboard, 2 housing, 3 opening, 4 mounting equipment, 5 face plate, 6 reinforcing member, 7 bolt fixing point, 10 rating plate, 11 caution plate, 12 manual opening/closing part, 13 operation display part, 14 bolt Fixed points, 15 floors, 16 walls, 17 extensions, 18 bolt fixed points, 20 doors, 21 hinges, 22 bolt fixed points, 23 protective relays, 24 meters, 25 test terminals, 26 lamps, 27 switches.

Claims (6)

A housing,
Onboard equipment to be mounted in this case,
A fastening portion that fastens the housing and the mounted device,
A closed type switchboard, comprising: a reinforcing member that reinforces fixing between the fastening portion and the housing. The fastening portion is a face plate,
The closed type switchboard according to claim 1, wherein the reinforcing member is installed on a surface of the face plate opposite to a surface facing the mounted device. The face plate has a display unit and an operation unit,
The closed type switchboard according to claim 2, wherein the reinforcing member is provided in a portion of the face plate where the display portion and the operation portion are not provided. The fastening portion is a door with a hinge,
The closed type switchboard according to claim 1, wherein the reinforcing member is installed outside the door. The door has a display unit and an operation unit,
The closed type switchboard according to claim 4, wherein the reinforcing member is provided at a portion of the door where the display portion and the operation portion are not provided. The closed type switchboard according to any one of claims 1 to 5, wherein the reinforcing member has an extending portion that extends to the outside of the housing and can be fastened to a structural member outside the housing. ..

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