JPS5812509A - Vibrationproof switchboard - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to an earthquake-resistant switchboard.

To ensure power generation and transmission in the event of an earthquake disaster, power distribution boards must be earthquake resistant. Therefore, in order to improve the earthquake resistance of a switchboard, it must have a natural frequency that does not resonate with seismic waves. Therefore, it is necessary to set the natural frequency of the switchboard to 20 Hz or higher.

Switchboards with a gate-shaped structure in which multiple units are attached have been widely used in the past, but in order to increase the rigidity of the casing in this type of switchboard and make the inherent single acting frequency 20 Hz or more, the structure shown in Fig. 1 or The structure shown in FIG. 5 is commonly used.

FIG. 1 is a front view, in which a plurality of units 2, 2, . . . 2 are attached to the front of a housing 1 of a switchboard.

FIG. 2 is a side view, and FIG. 3 is a rear view. Switchboard housing 1
An opening 1a for maintenance is provided on the back side of the holder, and a door 3 covering the opening 1a is attached so as to be rotatable in opening and closing with four hinges 3a, 3a.

The AA cross section in FIG. 1 is shown in FIG. 4, and the BB cross section is shown in FIG. 5.

If a large number of units 2゜2 are attached to the front of the gate-shaped switchboard housing 1, the rigidity in the left and right direction will be insufficient, so a front reinforcing member 4 and a rear reinforcing member 5 are fixed in the middle in the height direction. .

Providing the front reinforcing member 4 at the center of the front face of the switchboard as described above is uneconomical because the number of units that can be installed on the front face of the switchboard is reduced.

In addition, if the rear reinforcing material 5 is provided across the maintenance opening 1a on the back of the switchboard as described above, it will be difficult to wire the inside of the switchboard when the switchboard is manufactured, and furthermore, during use, inspection.

This is accompanied by the problem of poor maintainability.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a power distribution board that is easy to perform internal wiring work and maintenance and inspection, and has excellent earthquake resistance.

In order to achieve the above-mentioned object, the present invention is a power distribution board in which a plurality of units are assembled, and a flat cover separate from a door-shaped door is fixed to the maintenance opening of the power distribution board with mounting screws. In addition, a reinforcing member that also serves as a wiring duct is fixed to the lower front end of the switchboard to support the unit from below.

Next, an embodiment of the present invention will be described with reference to FIGS. 6 to 9. FIG. 6 is a horizontal cross-sectional view of this example, which corresponds to FIG. 5 in the conventional power distribution board, and FIG. 7 is a vertical cross-sectional view of this example, which corresponds to FIG. 4 in the conventional power distribution board.

The switchboard casing 1 in this example is a structural member similar to the casing of a conventional switchboard, and has a maintenance opening 1a on its back surface and a hinged door 3 that can be rotated to open and close.

A cover attachment member 7 is welded to the inside of the opening 1a, and a cover 8 is attached to the cover attachment member 7 with cover attachment screws 9. The above-mentioned cover 8 has a flat plate shape as shown in FIG. 8, has pushers 10, 10 fixed thereto, and has daruma-shaped screw holes 11, 11 bored around its periphery.

A female screw hole 12.12 corresponding to the above-mentioned Daruma type screw hole 11゜1i is drilled in the cover mounting material 7, and a round head screw type mounting screw 9, 9 is screwed into this, and the length of the screw is half the length of the screw. Just tighten it. Then, pass the round heads of the mounting screws 9, 9 through the Daruma-shaped screw holes 11.11 of the cover 8, and pull the cover 8 onto the mounting screws 9.9.
Tighten to secure the cover 8 to the opening 1a.

In this example, the maintenance opening 1a of the housing 1 is designed to be covered by two covers 8, 8, but the number of covers 8 to be installed can be set arbitrarily.

In this embodiment, the maintenance amount for the switchboard is as described above [1.8] A flat plate-shaped cover 8 is fixed with mounting screws 9, separately from the door-shaped door 3.

As a result, the back plate of the switchboard housing 1 has almost the same rigidity as a case where the opening 1a is not provided.

Next, as shown in FIG. 7, a wiring duct/support 6 is fixedly installed at the lower front end of the switchboard housing 1. The above-mentioned wiring duct/support 6 is a sheet metal member as shown in FIG. 9, and is fixed to the front lower end of the switchboard housing 1 in the left and right direction to support the units 2, 2 from below. Housing 1
is strong against vertical vibration, and even if the depth dimension of the unit 2 is large, sufficient vibration resistance can be obtained. Then, the wiring of the units 2, 2, . . . is passed through the space within this wiring duct/support 6. This provides a reinforcing effect that does not create any empty or wasted space at the lower front of the switchboard.

In this embodiment, as described above, a reinforcing member that also serves as a wiring duct is fixed to the lower end of the front face of the switchboard.

In this embodiment, as described above, the switchboard housing 1 is seismically reinforced with the cover 8 and the wiring duct/support 6, and the front reinforcement 4 and rear reinforcement provided in the conventional switchboard (see Fig. 4) Material 5 is omitted.

By omitting the front reinforcing member 4, the units 2, 2 can be disposed by effectively utilizing the entire front surface of the switchboard. Also,
Since the rear reinforcing member 5 is not provided, when the door 3 is opened, the cover mounting screws 9.9 are loosened, and the cover 8 is removed, the entire area of the maintenance opening 1a on the back side of the switchboard is opened. Therefore, wiring work inside the switchboard and inspection and maintenance can be easily performed.

As described above, the present invention provides a power distribution board in which a plurality of units are assembled, in which a flat cover is fixed to the maintenance opening of the power distribution board with mounting screws, and one By providing a reinforcing material that also serves as a wiring duct, the practical effect is that excellent earthquake resistance can be obtained without interfering with wiring work or maintenance inspection inside the switchboard, and without hindering the effective use of the front of the switchboard. There is.

[Brief explanation of the drawing]

Figures 1 to 5 show an example of a switchboard commonly used in the past, with Figure 1 being a front view, Figure 2 being a side view, Figure 3 being a rear view, and Figure 4 being the A of Figure 1. -A sectional view, and FIG. 5 is a BB sectional view. 6 to 9 show an embodiment of the present invention. 6 is a horizontal sectional view corresponding to FIG. 5 of the conventional switchboard, FIG. 7 is a vertical sectional view corresponding to FIG. 4 of the conventional switchboard, and FIG.
The figure is a perspective view of a flat cover, and FIG. 9 is a perspective view of a reinforcing member that also serves as a wiring duct (wiring duct and support). DESCRIPTION OF SYMBOLS 1... Switchboard, 1a... Maintenance opening of the switchboard, 2... Unit, 3... Door-shaped door, 4...
...Front reinforcing material, 5... Rear reinforcing material, 6... Reinforcing material that also serves as a wiring duct (wiring duct and support), 7... Cover coverage side, 8... Cover, 9... Cover mounting screw, 1 o...Grip Fig. 4 Fig. S Fig. 7 Port

Claims (1)

[Claims] 1. In a power distribution board in which multiple units are assembled, a flat cover separate from the 1-type door is fixed to the maintenance opening of the power distribution board with mounting screws, and the front lower end of the power distribution board is An earthquake-resistant switchboard characterized in that a reinforcing member that also serves as a wiring duct is fixedly installed to support the unit from below.