JPH11289611A - Wiring duct of distribution panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electromagnetic noise from being induced in electric wires inside a distribution panel, and to perform wiring with electric wires with satisfactory wiring and without requiring a superfluous fitting space. SOLUTION: The brim part of a box board 10 made of a steel board constituting the box of a distribution panel is folded into a U-shape to use this as a wiring space, and one side of a shield board 11 made of a steel board and bent so as to be in an L-shape and one end of the wiring space are lapped and stuck, and the opened part of the wiring space is covered with another side of the shield board 11. On another side of the shield board 11 which covering the opened part of the wiring space, an intermittent annular gap is formed, and it is possible to easily form a circular electric-wire draw-out hole by applying force to the central part of this annular gap. Or if a shielding board made from synthetic resin in the same shape as the shielding steel board 11 is used in place of the shielding steel board 11, its electromagnetic shielding ability decreases more than one made of a steel board, but forming of an electric-wire draw-out hole can be performed more easily than board made of a steel board.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distribution board wiring duct for securing a space for laying electric wires inside a distribution board.

[0002]

2. Description of the Related Art FIG. 6 is a structural view showing a general example of a synthetic resin duct conventionally used for accommodating electric wires in a switchboard, in which a U-shaped duct body 2 and a duct cover 4 are shown. And The duct body 2 forms a U-shape at the bottom, right side, and left side, and accommodates the electric wire 5 therein. The U-shaped opening is covered with the duct lid 4 to protect the housed electric wire 5. . At the bottom of the duct body 2, the duct body 2
An attachment hole (not shown) for attaching the wire is machined, and an electric wire outlet 3 for extracting the housed electric wire is machined in advance on the right side and the left side. Since the material of the duct body 2 is often a soft synthetic resin, it is easy to perform processing such as cutting out and expanding the wire outlet 3 or cutting off a partition between the wire outlets 3.
Can be accommodated.

FIG. 7 is a structural view showing a case where the general synthetic resin duct shown in FIG. 6 is applied to a switchboard, and shows the switchboard with a door removed from a front view. I have. In FIG. 7, a synthetic resin duct 1A (consisting of a duct main body 2 and a duct lid 4 shown in FIG. 6) is mounted in a horizontal direction on an upper end (that is, near a ceiling) of a rear plate (rear side of the switchboard) of the switchboard. When installing,
As described above, the mounting holes provided at the bottom of the duct main body 2 are used. A synthetic resin duct 1B having the same configuration as the synthetic resin duct 1A is also attached to the right end of the rear panel of the switchboard in the vertical direction. Thus the electric wire 5 laid near the ceiling
Can be guided to the lower part of the switchboard via the synthetic resin ducts 1A and 1B. As described above, since the wire outlet 3 is provided on the side of the duct body 2, if the wire 6 for the tool is drawn out from the side of the synthetic resin duct 1B in the vertical direction, the wire 7 is connected to the tool 7 attached to the back plate. Can be easily connected.

[0004]

Recently, electronic devices have often been housed in switchboards. As is well known, electronic devices are likely to malfunction due to noise.
Not only does the device shield itself to block the intrusion of noise that propagates through the space, but if it does not prevent electromagnetic noise from being induced into the wires connected to the electronic device, noise can enter the electronic device. Will be lost.

Therefore, instead of the synthetic resin duct conventionally used, a wiring duct made of a ferromagnetic material (generally a steel plate) in the same shape is attached to the inside of a switchboard, and electric wires are stored in the steel plate duct. Like that. However, the steel sheet duct requires processing of the drawn-out hole of the housed wiring, and there is a problem that the processing is troublesome. Further, since a space for attaching the duct is required in the switchboard as in the case of the synthetic resin duct, there is a disadvantage that the internal space of the switchboard is narrowed.

Accordingly, the present invention prevents electromagnetic noise from being induced into the electric wires inside the switchboard, and also allows the wires to be laid without a need for extra installation space, with good workability in wiring laying. It is in.

[0007]

In order to achieve the above-mentioned object, a wiring duct of a switchboard according to the present invention has an edge portion of a ferromagnetic metal plate forming a box of the switchboard in a U-shape. One surface of a shielding plate having a configuration in which a ferromagnetic metal plate is bent into an L-shape and one surface of the wiring space are overlapped and fixed to each other, thereby forming an opening in the wiring space. Is covered with another surface of the shielding plate.

On the other surface of the shielding plate covering the opening of the wiring space, a structure capable of opening a hole or a notch having a desired shape by applying a small external force is previously processed. . Or L covering the wiring space
The letter-shaped shielding plate is made of synthetic resin. On the other surface of the L-shaped synthetic resin shielding plate which covers the opening of the wiring space, a structure capable of opening a hole or a notch of a desired shape with a small external force is pre-processed.

[0009]

FIG. 1 is a structural view showing a first embodiment of the present invention. In FIG. 1, an edge portion of a box body plate 10 in which a box body of a switchboard is made of a steel plate as a ferromagnetic metal plate is bent in a U-shape, and the electric wire 5 is stored in the U-shaped recess. Further, one surface of an L-shaped shielding plate 11 also made of a steel plate as a ferromagnetic metal plate and one surface of the box body plate 10 are overlapped with each other, so that The opening of the U-shaped recess is covered with the other surface of the shielding plate 11. The portion where the box body plate 10 and the shielding plate 11 are overlapped is fixed to each other by screwing or the like. With this structure, the electric wire 5 is covered with a steel plate, so that the electric wire 5 is electromagnetically shielded and electromagnetic noise is prevented from being induced to the electric wire 5. Further, since the shielding plate 11 covers the opening, the electric wire 5 can be prevented from being exposed and damaged, and foreign matter can be prevented from entering the U-shaped concave portion.
It is also possible to avoid the possibility that the electric wire 5 is exposed and the appearance is deteriorated.

FIG. 2 is a structural view showing a case where the first embodiment shown in FIG. 1 is applied to a switchboard, and shows the switchboard with the door removed from a front view. This figure 2
In FIG. 1, the electric wire 5 is housed in a recess formed by bending the edge of the ceiling plate of the switchboard into the state shown in FIG. 1, and the opening of the recess is closed with a horizontal shielding plate 11. Also, the edge of the side panel of the switchboard is bent in the same manner, and the vertical shielding plate 1 is formed.
Step 1 closes the opening of the recess. The device electric wire 6 may be drawn out from the vertical U-shaped concave portion and wired to the device 7.

FIG. 3 is a structural view showing a second embodiment of the present invention, and shows a structure of an electric wire outlet of a shielding plate.
That is, an intermittent ring-shaped gap 15 is formed on the other surface of the shielding plate 11 covering the opening of the U-shaped concave portion, and a force is applied to the central portion of the ring-shaped gap 15 as necessary. . For example, a circular hole can be easily obtained by strongly tapping this central portion with a handle of a screwdriver, so that if the electric wire is pulled out through this hole, wiring to the device 7 can be easily performed.

FIG. 4 is a structural view showing a shielding plate having an electric wire outlet obtained in the second embodiment of FIG. 3, wherein a force is applied to a central portion of the ring-shaped gap 15 shown in FIG. The resulting circular wire outlet 16 is illustrated. FIG.
Is a structural view showing a shield plate having a wire outlet of a different shape. By making the intermittent gap a shape other than a ring shape, a wire outlet of a desired shape can be obtained. For example, a wire outlet 17 provided with a notch at the upper end
Alternatively, the electric wire outlet 18 can have a narrow cut width at the upper end. If the hole for drawing out the electric wire is connected to the upper end as shown in FIG. 5, there is an advantage that the operation of drawing out the electric wire from the duct can be easily performed.

It should be noted that a protective cover (not shown) is naturally added around each of the above-mentioned electric wire outlets so as not to damage the electric wires. Although not shown, if an L-shaped shielding plate made of synthetic resin is used for covering the concave portion instead of the shielding plate 11 made of a steel plate, the electromagnetic shielding effect is inferior to that made of the steel plate. The effect of preventing intrusion is obtained.

[0014]

According to the present invention, since the wiring duct for storing the electric wires is formed by bending the steel plate box constituting the box of the switchboard, a separate wiring duct is added to the switchboard. Compared to the conventional method, the space inside the switchboard can be used more widely, and since this wiring duct is covered with a steel plate, a large electromagnetic shielding effect can be obtained, so that the risk of noise being induced in the electric wire can be greatly reduced. Is obtained, and since there is no opening in the wiring duct, entry of foreign matter can be prevented, and the appearance is improved. Further, by bending the edge portion of the box body plate, the strength of the box body plate is improved, and the effect of increasing the strength of the switchboard can be obtained. Alternatively, by using a thinner box plate and obtaining the same box strength as before, the weight of the switchboard and the resource saving effect can also be obtained.

[Brief description of the drawings]

FIG. 1 is a structural diagram showing a first embodiment of the present invention.

FIG. 2 is a structural diagram showing a case where the first embodiment shown in FIG. 1 is applied to a switchboard;

FIG. 3 is a structural diagram showing a second embodiment of the present invention.

FIG. 4 is a structural view showing a shielding plate having an electric wire outlet obtained in the second embodiment of FIG. 3;

FIG. 5 is a structural diagram showing a shield plate having electric wire outlets of different shapes.

FIG. 6 is a structural diagram showing a general example of a synthetic resin duct conventionally used to house electric wires in a switchboard.

7 is a structural diagram showing a case where the general synthetic resin duct shown in FIG. 6 is applied to a switchboard;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A, 1B Synthetic resin duct 2 Duct main body 3 Electric wire outlet 4 Duct lid 5 Electric wire 6 Appliance electric wire 7 Appliance 10 Box body plate 11 Shielding plate 15 Ring-shaped gap 16, 17, 18 Electric wire outlet

Claims (4)

[Claims] 1. A switchboard comprising a box body using a ferromagnetic metal plate, wherein a wiring space obtained by bending an edge of the ferromagnetic metal plate into a U-shape is provided. And a shielding plate obtained by bending the L-shape,
A wiring duct for a switchboard, wherein one surface of the wiring space and one surface of the shielding plate are overlapped and fixed to cover an opening of the wiring space with another surface of the shielding plate. 2. A wiring duct for a switchboard according to claim 1, wherein a hole or a notch of a desired shape is formed on another surface of said shielding plate covering said opening of said wiring space by applying a slight external force. A wiring duct for a switchboard, wherein a structure capable of being opened is processed in advance. 3. A switchboard comprising a box made of a ferromagnetic metal plate, wherein a wiring space obtained by bending an edge portion of the ferromagnetic metal plate in a U-shape and an L-shaped synthetic resin are provided. A cover obtained by molding into a shape, wherein one surface of the wiring space and one surface of the cover are overlapped and fixed to cover the opening of the wiring space with the other surface of the cover. Characteristic distribution duct of distribution board. 4. The wiring duct according to claim 3, wherein a hole or a notch having a desired shape is formed on another surface of the cover that covers the opening of the wiring space by applying a slight external force. A wiring duct for a switchboard, wherein a structure capable of being processed is processed in advance.