JP2024047640A - Electrical equipment storage box and construction method for electrical equipment storage box - Google Patents

Abstract

[Problem] To prevent rain and the like from entering through the ventilation hole even without attaching a member to the channel base of an electrical equipment storage box. [Solution] An electrical equipment storage box having a housing with a door 11, side panels, a roof, and a channel base 14a, in which a ventilation hole 14aa is provided in the channel base located on the bottom side of the housing, and a side panel located away from the ventilation hole or the door in a closed state overlaps part or all of the ventilation hole when viewed horizontally. [Selected drawing] Figure 5

Description

The present invention relates to a box for storing electrical equipment and a method for constructing a box for storing electrical equipment.

It is known that vents are provided in electrical equipment storage boxes such as cubicle-type high-voltage power receiving equipment to allow ventilation inside the housing. As can be understood from the description in Patent Document 1, the vents are generally provided on the underside of the eaves on the roof of the electrical equipment storage box or in the channel base that constitutes the bottom of the housing. When vents are provided in the channel base, the vents are located close to the installation surface, so there is a risk of rain, snow, insects, small animals, etc. entering through the vents. For this reason, Patent Document 1 proposes covering the vents with a magnetic sheet to prevent the intrusion of rain, snow, insects, small animals, etc.

JP 2000-175313 A

However, the magnetic sheet described in Patent Document 1 prevents ventilation from passing through the blocked air vents, and is not suitable for situations where ventilation is required. Magnetic sheets can also be easily peeled off. Instead of attaching a magnetic sheet to the channel base, it is possible to screw a member that covers the air vents to the channel base, but the channel base may be located at the bottom end of the electrical equipment storage box, and installing the member that covers the air vents may be time-consuming.

The inventor of this case has thoroughly investigated this issue and attempted to solve it. The problem that this invention aims to solve is to make it difficult for rain and other elements to get in through the ventilation holes even without attaching a component to the channel base of the electrical equipment storage box.

To solve the above problem, an electrical equipment storage box is provided that has a housing having a door, side panels, a roof, and a channel base, and the channel base is provided with an air hole on the bottom side of the housing, and the side panel located away from the air hole or the door in a closed state overlaps part or all of the air hole when viewed horizontally.

It is also preferable that the side panel or the door in the closed state, which is located away from the ventilation hole, can cover at least the upper half of the ventilation hole when viewed horizontally, and that the lower ends of the side panel and the door are positioned at the same height as the lower end of the channel base or higher.

It is also preferable that the channel base be configured so that it is stacked on top of the stand.

It is also preferable that the channel base and the stand are fixed together using fasteners placed between the vent and the door.

The method for constructing an electrical equipment storage box includes the steps of fixing a stand to a construction site, assembling a housing so that a side panel or door of the housing can cover part or all of the ventilation holes in the channel base, placing the assembled housing on the stand, and fixing the channel base of the housing to the stand with fasteners.

The present invention makes it possible to prevent rain and other elements from entering through the ventilation holes without having to attach any components to the channel base of the electrical equipment storage box.

FIG. 2 is a perspective view of a housing of the electrical device storage box according to the embodiment. 2 is a perspective view showing a state in which some side panels are removed from the housing shown in FIG 1 and the door is open, with the housing placed on a stand. 1 is a diagram showing the periphery of the air vent when the door of the housing of the embodiment is open; FIG. 1 is a diagram showing the relationship between the lower part of the door and the lower part of the side plate with respect to the channel base of the housing in the embodiment, although the ventilation hole provided in the channel base is covered by the door or the like. 1 is a cross-sectional view of the lower front portion of a housing according to an embodiment, showing the angle θ between the horizontal line and a line passing through the lower end of the air vent and the lower end of the door. FIG. 2 is a diagram showing a state in which a housing is placed on a stand. FIG. 13 is a diagram showing an example in which a channel base and a stand are fastened with a fastener. FIG. 13 is a diagram illustrating a state in which a housing is placed on a stand that has been fixed in advance. 1 is a cross-sectional view of the lower front portion of the housing of an embodiment showing the location of the door, vents and fasteners. FIG.

The following describes an embodiment of the invention. As can be seen from Figs. 1 to 5, the electrical equipment storage box 1 of the embodiment includes a housing 10 having a door 11, side panels 12, a roof 13, and a channel base 14a. The electrical equipment storage box 1 also includes an air hole 14aa in the channel base 14a located on the bottom side of the housing 10, and the side panel 12 located away from the air hole 14aa or the door 11 in a closed state overlaps part or all of the air hole 14aa in a horizontal view. This makes it possible to prevent rain and the like from entering through the air hole 14aa even if no member is attached to the channel base 14a of the electrical equipment storage box 1.

In the following, a cubicle-type high-voltage power receiving equipment is used as an example for explanation (see Figure 1), but the electrical equipment storage box 1 does not have to be a cubicle-type high-voltage power receiving equipment. Anything that is generally recognized as an electrical equipment storage box 1 is acceptable, such as other high-voltage power receiving equipment, a distribution board, a switchboard, or a system rack.

The electrical equipment storage box 1 generally comprises a housing 10 configured by attaching side panels 12, a door 11, a roof 13, etc. to a structure 14 formed into a skeleton by connecting multiple rod-shaped frames 141 made by bending plate-shaped members (see FIG. 2). Various electrical equipment is stored inside this housing 10. Representative examples of electrical equipment stored inside the housing 10 include circuit breakers, switches, disconnectors, relays, sensors, transformers, current transformers, capacitors, reactors, etc., but the electrical equipment is not necessarily limited to these.

The skeletal structure 14 in the embodiment has a door frame 14b formed by connecting multiple frames 141 on the side on which the door 11 is attached. The door 11 is rotatably attached to this door frame 14b using hinges 15. The door 11 in the embodiment is provided with an inspection window 11a that allows inspection of the electrical equipment stored inside the housing 10. The electrical equipment storage box 1 is also provided with a locking device 11b that can lock the door 11 to prevent it from being opened without permission, and this can prevent unauthorized persons from entering the electrical equipment storage box 1.

The frame 141 located at the lower end of the skeletal structure 14 is called the channel base 14a, but the channel base 14a in this embodiment has a different shape from the other frames 141 that make up the skeletal structure 14, and has a roughly U-shaped cross section.

In addition, the channel base 14a of the embodiment has three sides that form a roughly U-shaped cross section, and the side that extends horizontally at the bottom of the channel base 14a has a mounting hole 14ab that penetrates in the vertical direction (see FIG. 3). This mounting hole 14ab can be used for fixing to a foundation made of concrete, fixing to a stand 29, or fixing to a frame 141.

The vertically extending sides of the channel base 14a are provided with ventilation holes 14aa for ventilating the inside of the housing 10. In this embodiment, multiple oval holes extending vertically as ventilation holes 14aa are provided in the longitudinal direction of the channel base 14a. In particular, multiple ventilation holes 14aa are provided in the front part of the housing 10 in a line in the left-right direction, making it easier to ventilate from the front side of the housing 10.

In the embodiment, the frame 141 extending in the front-rear direction on the right and left sides of the channel base 14a also has ventilation holes 14aa on its front end side, but the number of ventilation holes 14aa on the frame 141 extending in the left-right direction on the front side is greater than the number of ventilation holes 14aa on this frame 141 (so that the total area is larger). This is because the electrical equipment storage box 1 is installed so that an inspection space is secured in front of the side where the door 11 is installed, and the front side of the electrical equipment storage box 1 is easily used for ventilation. However, the shape and number of the ventilation holes 14aa on the channel base 14a are not limited to this example.

In the embodiment, the side panel 12 and door 11 are configured to extend downward more than usual so that they can overlap at least a portion of the ventilation hole 14aa in a horizontal view (see Figures 3 to 5). This allows the side panel 12 and door 11 to prevent rain and other elements from entering the ventilation hole 14aa. In addition, because the side panel 12 and door 11 are separated from the ventilation hole 14aa, the side panel 12 and door 11 do not completely block air from entering the ventilation hole 14aa, allowing the ventilation hole 14aa to function.

In this embodiment, the side panels 12 and the door 11 are configured to face at least 90% of the vertical length of the ventilation holes 14aa provided in the channel base 14a. In this embodiment, some of the lower part of the ventilation hole 14aa does not overlap with the side panels 12 and the door 11, but since the side panels 12 and the door 11 are located away from the ventilation hole 14aa, it is difficult for rain to enter the ventilation hole 14aa even if it rains sideways.

Of course, the entire ventilation hole 14aa provided in the channel base 14a may be configured to overlap the side plate 12 or the door 11 in the horizontal direction. The overlap rate may be reduced from the above example, but it is preferable that at least the upper half of the ventilation hole 14aa overlaps the side plate or the door in a closed state when viewed horizontally.

If the angle θ between the line passing through the lower end of the ventilation hole 14aa and the lower end of the door 11 and the horizontal line, or the angle θ between the line passing through the lower end of the ventilation hole 14aa and the lower end of the side panel 12 and the horizontal line is in a positive range, it is preferable to configure the angle θ not to be large (see FIG. 5). Note that the angle θ is an acute angle, and if the door 11 or the side panel 12 extends below the lower end of the ventilation hole 14aa, it is considered to be a negative angle. If it is possible to reduce the angle at which the door 11 or the side panel 12 can enter the ventilation hole 14aa in a straight line from the outside of the housing 10, it will be possible to effectively deal with raindrops from the side.

In addition, when the angle θ is negative, that is, when the lower end of the door 11 or the lower end of the side plate 12 is located below the lower end of the ventilation hole 14aa, the intrusion of rainwater into the ventilation hole 14aa when the rainwater bounces back on the installation surface can also be suppressed. In order to obtain this effect, when the lower end of the door 11 or the lower end of the side plate 12 is located above _lα , which is a tangent to the side that passes through the lower end of the ventilation hole 14aa and extends horizontally at the lower part of the channel base 14a, it is desirable that the lower end of the door 11 or the lower end of the side plate 12 is lower. On the other hand, when the lower end of the door 11 or the lower end of the side plate 12 is located below _lα , which is a tangent to the side that passes through the lower end of the ventilation hole 14aa and extends horizontally at the lower part of the channel base 14a, even if the lower end of the door 11 or the lower end of the side plate 12 is further lowered, the effect is not expected to increase significantly.

Even if the angle θ is negative, it is preferable to configure the lower end of the door 11 and the lower end of the side plate 12 so that they are higher than the lower end of the channel base 14a. In this case, the channel base 14a will support the entire housing 10 even when it is placed on a flat surface, so it is possible to avoid placing a load on the door 11 and the side plate 12. It is acceptable to make the lower end of the door 11 and the lower end of the side plate 12 the same as the lower end of the channel base 14a, but if the lower end of the door 11 and the lower end of the side plate 12 are lower than the lower end of the channel base 14a, it may be inconvenient to handle. This is because it is difficult to transport the assembled housing 10. However, such a configuration is acceptable when assembling the housing 10 at the installation site.

As can be seen from the above, various configurations are possible, but considering ease of use and the degree of prevention of intrusion of rainwater, etc. into the ventilation hole 14aa, it is preferable that the side panel 12 located away from the ventilation hole 14aa or the door 11 in the closed state can cover at least the upper half of the ventilation hole 14aa when viewed horizontally, and that the lower end of the side panel 12 and the lower end of the door 11 are positioned at the same height as or higher than the lower end of the channel base 14a.

The electrical equipment storage box 1 of the embodiment has a metal fitting 13a on the roof 13 of the housing 10. By passing a rope or the like through this metal fitting 13a, the housing 10 can be lifted up and moved to the installation location. For example, after placing the channel base 14a of the housing 10 of the electrical equipment storage box 1 on a concrete foundation or the like, it can be fixed with a fastener 31 using the mounting hole 14ab.

On the other hand, when installing the electrical equipment storage box 1 on a concrete foundation, it is necessary to check that the installation location is level and to install anchor bolts into the concrete foundation. This is troublesome, so one possible solution is to install the stand 29 at the installation location before the housing 10. In this way, it is easier to check that the installation location is level and to install anchor bolts, because the stand 29 can be used as a reference point.

In addition, by stacking the channel base 14a on the stand 29, the ventilation holes 14aa provided in the channel base 14a can be positioned higher, which further prevents rain, snow, insects, small animals, etc. from entering through the ventilation holes 14aa. For this reason, it is preferable to configure the channel base 14a so that it is mounted so that it is stacked on top of the stand 29 (see Figure 6).

When using a stand 29, it is also possible to fix the housing 10 onto the stand 29 by placing the channel base 14a on top of the installed stand 29 and fixing the channel base 14a to the stand 29 with fasteners 31 such as bolts and nuts (see Figure 7).

Considering ease of installation, the construction method for the electrical equipment storage box 1 preferably includes the steps of fixing the stand 29 to the construction site, assembling the housing 10 so that the side panel 12 or door 11 of the housing 10 can cover part or all of the ventilation hole 14aa in the channel base 14a, placing the assembled housing 10 on the stand 29, and fixing the channel base 14a of the housing 10 to the stand 29 with fasteners 31 (see FIG. 8).

In the embodiment, the fastener 31 used to fix the housing 10 is configured to be located between the vent hole 14aa provided in the channel base 14a and the door 11 (see FIG. 9). In addition, the lower end of the door 11 is configured to cover a part of the nut, so that the fastener 31 is difficult to remove when the door 11 is closed. Of course, it is not necessary for the door 11 to cover only a part of the nut. The same effect can be obtained if the lower end of the door 11 is configured to cover a part of the fastener 31, so that the fastener 31 is difficult to remove when the door 11 is closed. As can be understood from these descriptions, it is preferable to fix the channel base 14a and the stand 29 using the fastener 31 arranged between the vent hole 14aa and the door 11.

It is preferable that a space is provided between the door 11 and the end of the channel base 14a on the door 11 side, so that air can flow in from the outside of the door 11 to the ventilation hole 14aa or flow out from the ventilation hole 14aa to the outside of the door 11 through this space. Of course, it is preferable that a space is provided between the end of the channel base 14a on the side plate 12 side and the side plate 12, so that air can flow in from the outside of the side plate 12 to the ventilation hole 14aa or flow out from the ventilation hole 14aa to the outside of the side plate 12 through this space.

The present invention has been described above using the embodiments as examples, but the present invention is not limited to the above embodiments and can be implemented in various forms. In the embodiment, the channel base has ventilation holes on the front and left and right sides, but other configurations are also possible, such as providing ventilation holes only on the front side, only on the left and right sides, or only on the rear side of the channel base.

1 Electrical equipment storage box 10 Housing 11 Door 12 Side panel 13 Roof 14a Channel base 14aa Vent 29 Frame 31 Fastener

Claims (5)

An electrical equipment storage box having a housing having a door, side panels, a roof, and a channel base,
The channel base located on the bottom side of the housing has ventilation holes.
A box for storing electrical equipment, in which a side panel located away from the ventilation hole or a door in a closed state overlaps part or all of the ventilation hole in a horizontal view. The electrical equipment storage box according to claim 1, wherein the side panel or the door in the closed state, which is located away from the vent hole, can cover at least the upper half of the vent hole when viewed horizontally, and the lower ends of the side panel and the door are positioned at the same height as or higher than the lower end of the channel base. The electrical equipment storage box according to claim 1, in which the channel base is attached so as to be stacked on the stand. The electrical equipment storage box according to claim 3, in which the channel base and the stand are fixed together using fasteners disposed between the vent and the door. A method for constructing an electrical equipment storage box, comprising the steps of:
Fixing the mounting base to a construction site;
Assembling the housing so that a side panel or a door of the housing can cover a part or all of the ventilation hole provided in the channel base;
placing the assembled housing on a stand;
a step of fixing a channel base provided on the housing and a stand with a fastener;
A method for constructing an electrical equipment storage box comprising the steps of: