JPS6011684Y2 - switchboard - Google Patents

Description

[Detailed description of the invention] The present invention relates to a power distribution board, and in particular improves the structure of the gusset used at the joint between the ceiling frame, bottom frame, and column frame of a steel plate power distribution board that is assembled by processing and forming steel plates. The purpose of mounting inside the panel is to increase the weight of the parts obtained and strengthen the rigidity.

BACKGROUND ART Conventionally, a steel plate switchboard made of steel plates that are processed and formed and assembled together is generally constructed as shown in FIGS. 1 to 6.

To explain this for all figures, 1, 1... are column frames,
2 is a ceiling frame, 3 is a bottom frame, and these pillar frames 1 and ceiling frame 2
, the bottom frame 3 is molded separately, and each frame is connected by a gusset 4 as shown in FIG.

In the example shown in FIG. 2, the gusset 4 is attached to the bottom frame 3 by appropriate spot welding 5, and the column frame 1 is attached by rivets 6 under the brine.

As shown in FIG. 3, this gusset 4 has a bottom plate 4a having a hollow triangular shape, and side walls 4b projecting at right angles from the equilateral side ends of the bottom plate 4a formed in an isosceles triangular shape. Ori,
The corner portions of these side walls 4b, 4b are rising portions 4c having an L-shaped cross section.

The gusset 4 having such a structure has its bottom plate 4a fixed to a corner of the bottom frame 3 by arc spot welding 5, and the lower end of the column frame 1 is fitted from the outside of the rising portion 4c of the gusset 4.

Then, a suitable portion thereof is fixed to the rising portion 4c of the gusset 4 by a blind rivet 6.

A cross-sectional plan view in this fixed state is shown in FIG.

As shown in FIG. 5, the housing 7 of the switchboard constructed as described above is further provided with a middle frame 8, and an instrument plate 9 is attached to the middle frame 8 to accommodate reactors, capacitors, etc. that are of considerable weight. Electrical equipment 10 is being installed.

However, in this case, the instrument plate 9 serves as reinforcement and
Although the deformation in the -X direction is reduced, it does not serve as reinforcement in the Y-Y direction, and the mounting of the gusset 4 is not strong enough depending on the structure.

Further, as shown in FIG. 6, a shelf 11 may be provided on the housing 7 and the electrical equipment 10 may be placed on it. In this case, the shelf 11 is Direction, Y
- It is not reinforced in both the Y direction.

According to experience and experiments, the displacement of the ceiling with respect to the foundation of the switchboard explained above is very rarely caused by the curved deformation of the column frame 1, and is hardly a problem. It is clear that this is due to a negligible deformation of the gusset part or a relative displacement between the parts at the fastening part.

Further, as described above, the influence of the mounting means of the electrical equipment 10, 10, etc. is small.

In general, the height of the power distribution board is quite high, 235-, including the height of the base 5 or IrIn, and the height of the power distribution board is quite high, 235- or 235-cm, including the height of the base 2 or the bottom frame 3.
A slight deformation or relative displacement of the gusset portion that connects the column frame 1 to the column frame 1 is magnified, and becomes a large displacement in the ceiling portion.

Furthermore, from the viewpoint of the structure, a large moment is applied to the gusset portion, and it can be inferred that deformation is likely to occur in this portion, and the relative displacement or excessive deformation that occurs will result in permanent deformation.

Therefore, according to the conventional switchboard, the following problems arise.

■ When moving and transporting the switchboard, deformation tends to occur at the gusset.

In particular, when moving and transporting the product, it is fine if it is hung vertically, but when it is pulled down or raised when it is placed on its side and transported by a forklift, an excessive moment is applied to the gusset, causing permanent deformation. easy.

■ In order to install heavier electrical equipment inside the switchboard, it is necessary to use a gusset that is strong enough to be less susceptible to deformation.

■ The fact that the amount of deformation is large relative to the weight of the electrical equipment installed in the switchboard means that the rigidity is low, the natural vibration is low, and there are problems in terms of vibration resistance.

■ When installing a door or inner door with a heavy object attached to the column frame, torsional force is generated on the column frame, easily deforming the column frame, and causing sag in the door or inner door.

The present invention solves the above-mentioned problems, and the embodiments shown in the drawings will be described below.

FIGS. 7 to 10 illustrate one embodiment of the present invention, and the same or corresponding parts as in FIGS. 1 to 6 are designated by the same reference numerals, and the explanation thereof will be omitted.

In the figure, reference numeral 12 indicates a reinforcing frame, and this reinforcing frame 1
As is clear from FIGS. 8 and 9, the steps 12a are bent in different steps in the width direction, and one step 12a is overlapped with the projecting piece 1a on the side of the column frame 1 and fixed with bolts 13 or the like.

The other stepped portion 12b has a blind rivet 14 superimposed on the inside of the bent portion 1b formed at the other end of the column frame 1.
Fixed by

This stepped reinforcing frame 12 is provided over the entire length inside the column frame 1, and serves not only to reinforce the rising portion of the gusset 4 but also to reinforce the column frame 1 itself.

Further, the column frame 1 is prepared with the reinforcing frame 12 and the gusset 4 fixed in advance and fixed to the bottom frame 3, as shown in FIG.

Further, an underframe 15 is fixed to the lower end of the bottom frame 3.

As shown in FIG. 8, the gusset 4 is fixed to the bottom frame 3 by blind rivets 14 or the like, and the gusset 4, the bottom frame 3, and the underframe 15 are collinear with each other by bolts 16.

Since this embodiment is constructed as described above, the torsional rigidity of the column frame 1 itself is increased, and even if a heavy door or an inner door is attached to the column frame, there will be no damage, and the gusset 4 itself can be reinforced. They can now be easily assembled together by using bolts or blind rivets.

As is clear from the above description, according to the present invention, a reinforcing frame having a stepped portion in the width direction is fixed inside the column frame over the entire length thereof, and the gusset itself is also reinforced by this reinforcing frame. This increases the rigidity of the switchboard as a whole, making it possible to obtain a strong switchboard without twisting or permanent deformation even when heavy objects are attached and transported by forklift.

[Brief explanation of drawings]

Figures 1 to 6 illustrate the conventional structure; Figure 1 is an exploded perspective view of the casing of the switchboard; Figure 2 is a partially enlarged perspective view illustrating how the gusset and column frame are installed. , Fig. 3 is a perspective view of the gusset, Fig. 4 is a cross-sectional plan view with the column frame attached, and Figs. 5 and 6 illustrate the deformed state with the inner frame and shelf board attached, respectively. Perspective view, Figure 7~
Fig. 10 explains one embodiment of the present invention, Fig. 7 is an exploded perspective view of the switchboard housing, Fig. 8 is an enlarged perspective view of the column frame and reinforcing frame fixed to the gusset, and Fig. 9 is an exploded perspective view of the switchboard housing. The figure is a perspective view of the column frame, and FIG. 10 is a cross-sectional plan view of the column frame. 1... Column frame, 2... Ceiling frame, 3...
...Bottom frame, 4...Gusset, 5...
Spot welding, 6, 14... Blind rivet, 7... Housing, 9... Middle frame, 10.
...Electrical equipment, 11...Shelf board, 12...
...Reinforcement frame, 12at 12b...Stepped portion, 16...Bolt.

Claims (1)

[Scope of utility model registration request] In a power distribution board in which column frames are arranged through gussets at the four corners of a ceiling frame and a bottom frame, a bottom plate 4a is provided at the four corners of the ceiling frame 2 and a bottom frame 3, and side walls 4b are provided on two sides located at right angles to each other.
Furthermore, a gusset 4 having a rising part 4e having a cross-section of an L-shaped cross section is fixed to the corner part, and the end of the column frame 1 having a C-shaped cross-section is applied to the outside of the rising part 4c. At the same time, a reinforcing frame 12 extending over the entire length of the column frame 1 is fixed to the inner surface of the bent portion 1b of the column frame 1 and the side surface of the protruding piece 1a. A power distribution board characterized in that its surface is configured in an approximately 10-Yo shape.