JP3103024U - Ground-mounted low-pressure branching device - Google Patents

Abstract

Provided is a ground-installed low-pressure branching device that can close the bottom of the device without increasing the cost and facilitate wiring work.
In a ground-mounted low-voltage branching device (1) for introducing a cable that passes through the ground into the inside from a bottom opening (1a) to distribute power, the bottom opening (1a) can be elastically deformed so as to close the opening (1a). A plurality of floor members 11 and 12 are provided such that opposing side surfaces of adjacent floor members abut against each other, and a cable is introduced from between adjacent floor members by elastically deforming the opposing side portions of the introduction portion. The configuration is as follows.
[Selection] Figure 2

Description

  The present invention relates to a ground-mounted low-pressure branching device, and more particularly to an improvement of its floor structure.

  In recent years, in urban areas, undergrounding of distribution lines has been promoted from the viewpoints of securing safe and comfortable traffic spaces, preventing urban disasters, improving cityscapes, and the like.

  In the underground of the distribution line, for example, as shown in FIG. 8, a ground-mounted power distribution device such as a multi-circuit switch, a high-voltage cabinet, a transformer, and a low-voltage branching device is installed on the ground such as a sidewalk. Cables are introduced from the bottom of the required ground-mounted power distribution device to the inside to distribute power (for example, see Non-Patent Document 1).

In such a ground-mounted power distribution device, the bottom of the device is closed except for a portion where cables enter and exit, in order to prevent accidents due to dew condensation and dust contamination.
Supervised by Yasuji Sekine, "Distribution Technology Comprehensive Manual", 1st edition, Ohm Co., Ltd., November 30, 1991, p. 68-71

  However, in the conventional ground-mounted low-voltage branching device, like a high-voltage ground-mounted power distribution device having an explosion-proof structure such as a multi-circuit switch, a high-voltage cabinet, and a transformer, the device is provided by a rigid floor member such as an iron plate. The bottom is closed, and an opening for introducing a cable is formed in the floor in advance.

  For this reason, there is a concern that the material cost and the processing cost of the floor member increase, which leads to an increase in the cost of the apparatus. Also, since the opening for introducing the cable in the floor member needs to be formed in advance according to the number of circuits, if there is an unused circuit, the opening for introducing the cable connected to that circuit is required. Must be closed with a cable cover or putty, and when connecting a new cable to an unused circuit, it is necessary to remove the cable cover and putty and introduce the cable. There is a problem that it is troublesome.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention, which has been made in view of such circumstances, is to provide a ground-mounted low-voltage branching device that can close the bottom of the device without increasing the cost and can easily perform wiring work.

The invention according to claim 1, which achieves the above object, is a ground-installed low-voltage branching device that distributes power by introducing a cable passing through the ground from the bottom opening to the inside,
In the bottom opening, a plurality of floor members elastically deformable so as to close the opening are provided such that opposing side surfaces of adjacent floor members are in contact with each other, and the cable is provided between the adjacent floor members. The elastic member is configured to elastically deform the side surface portion facing the introduction portion and introduce the elastic member.

  The invention according to claim 2 is the ground-mounted low-pressure branching device according to claim 1, wherein a plurality of separators for separating the cable to be introduced are provided in parallel in the bottom opening, and the separator is provided in each separator. A floor member is held.

  According to a third aspect of the present invention, in the low-pressure branching device according to the first or second aspect, the floor member is made of a foam.

  According to the first aspect of the present invention, since the bottom opening for introducing the cable is closed with the elastically deformable floor member, an inexpensive floor member can be used, and the cost of the apparatus can be reduced. In addition, since the cable passing through the ground is introduced from between adjacent floor members by elastically deforming the side surface portion facing the introduction portion, the cable introduction work can be facilitated, and furthermore, between the adjacent floor members. The opposite side where the cable is not introduced is kept in contact, so it is not necessary to close the cable inlet corresponding to the unused circuit, wiring work can be facilitated, and moisture and dust rising from the ground Can be effectively prevented, and the occurrence of dew condensation and dust contamination can be effectively prevented.

  According to the invention of claim 2, a plurality of separators for cable division are provided in parallel in the bottom opening, and the floor member is held in each separator, so that wiring work can be more easily performed while preventing power distribution mistakes. Thus, the floor member can be securely held in the bottom opening.

  According to the third aspect of the present invention, since the floor member is made of a foam, it is possible to reduce the weight of the apparatus and to absorb the rising moisture from the ground into the bubbles of the foaming agent constituting the foam. Since it can be effectively prevented from entering the inside of the apparatus main body, the occurrence of dew condensation can be more reliably prevented.

  Hereinafter, an embodiment of a ground-mounted low-pressure branching device according to the present invention will be described with reference to FIGS. 1 to 6.

  1 (a) and 1 (b) are a front view and a right side view of a ground-installed low-pressure branching device, FIG. 2 is an enlarged sectional view taken along the line AA of FIG. 1 (a), showing a configuration of a bottom portion, and FIG. 2 is an enlarged sectional view taken along the line BB of FIG. 2, FIG. 4 is an enlarged sectional view taken along the line CC, and FIGS. 5 (a) and 5 (b) are a plan view and a front view of the first floor member shown in FIG. a) and (b) are a plan view and a front view of the second floor member, and FIG. 7 is a perspective view showing a cable introduction state.

  As shown in FIGS. 1 (a) and 1 (b), this ground-mounted low-pressure branching device 1 includes a device main body 2 and a base main body attached to a lower portion thereof and fixed to a ground base portion via a base bolt. And 3. The apparatus main body 2 has an open bottom, a double door 4 (the right door is omitted in FIG. 1A) on the front side, and a plurality of three-phase four-wire A branch facility 5 having a connection terminal group for connecting each of U-phase, V-phase, W-phase, and N-phase cables for a circuit, a branch conductor for connecting the connection terminal group for each phase, and the like are provided. In the present embodiment, the branch equipment 5 for a total of 10 circuits, that is, four circuits for the main line and the connecting line and six circuits for the drop line, and U, V, and W for drop lines are provided. A low-voltage current-limiting fuse can be mounted between the phase connection terminal and the branch conductor corresponding to each phase.

  As shown in FIG. 2, flat portions 3 a to 3 d defining a bottom opening 1 a are formed at the bottom of the device main body 2 so as to protrude inward, and the front flat portion 3 a and the rear flat portion 3 a are formed. It is fixed to the base body 3 at three places with the flat part 3b via connecting bolts 6a to 6c and 6d to 6f.

  In the present embodiment, a plurality of separators for separating cables to be introduced from underground, and in this embodiment, nine separators 7 are provided between the flat portion 3a on the front side and the flat portion 3b on the rear side. They are arranged in parallel in the width direction.

  Each separator 7 is formed in a rod shape having a circular outer shape, and a portion corresponding to the bottom opening 1a is coated with an insulating material such as PVC. Of the nine separators 7, the center separator 7 has its both ends flattened and fixed to the flat portions 3a, 3b with the connecting bolts 6b, 6e. The other separator 7 is formed on a holding plate 8 provided on the rear surface side of the base body 3 as shown in FIG. The flattened end is inserted and held in the holding hole 8a, and is fixed to the flat portion 3a on the front side with a bolt 9 as shown in FIG.

  In the present embodiment, the first floor member 11 is held by each of the two separators 7 on both sides, and the second floor member 12 is held by each of the other seven separators 7 to close the bottom opening 1a. . Here, the first floor member 11 and the second floor member 12 have different width dimensions, and the first floor member 11 has a plan view and a front view as shown in FIGS. 5A and 5B. A hole 11a through which the separator 7 penetrates is formed at a position deviated from the center in the width direction, and the second floor member 12 has a width as shown in the plan view and the front view in FIGS. 6A and 6B. A hole 12a through which the separator 7 passes is formed at the center in the direction.

  The first floor member 11 and the second floor member 12 are each formed of an elastically deformable foam (sponge), for example, and the separators 7 are passed through the holes 11a and 12a, respectively. The bottom opening 1a is closed by attaching the floor member to the apparatus main body 2 with the opposing side surfaces in contact with each other. In addition, as a foam which comprises the 1st floor member 11 and the 2nd floor member 12, for example, Calmflex F-4 (trade name, manufactured by INOAC CORPORATION) is used, and the front and back surfaces are subjected to melt-tome processing.

  In this manner, in the present embodiment, the base body 3 is attached to the ground base via the base bolts, and the cable passing through the ground is introduced into the inside of the apparatus body 2 from between the adjacent floor members. Distribute power.

  With this configuration, for example, as shown in FIG. 7, the U-phase, V-phase, W-phase, and N-phase cables 15U, 15V, 15W, and 15N introduced from the ground into the inside of the device main body 2 are connected to those cables. Since the side portion of the floor member 12 facing the introduction portion can be elastically deformed and introduced, each cable can be easily introduced. Further, the opposing side surfaces between the adjacent floor members where the cable is not introduced remain in contact with each other, so that there is no need to perform a closing operation with a cable cover or a putty. Therefore, the wiring work can be facilitated, and the intrusion of rising moisture and dust from the ground can be effectively prevented, and the occurrence of dew condensation and dust contamination can be effectively prevented.

  In addition, since the floor members 11 and 12 are held by the cable separating separators 7 respectively, wiring work can be more easily performed while preventing power distribution mistakes, and the floor members 11 and 12 are reliably held in the bottom opening 1a. can do. Further, since the floor members 11 and 12 are made of, for example, foam (sponge) which can be elastically deformed, they can be made inexpensive, the cost and weight of the apparatus can be reduced, and the rising moisture from the ground can be removed from the floor. It is possible to effectively prevent the foaming agent constituting the members 11 and 12 from absorbing into the air bubbles and entering the inside of the apparatus main body 2, thereby more reliably preventing the occurrence of dew condensation.

  In addition, this invention is not limited only to the above-mentioned embodiment, and many modifications or changes are possible. For example, any floor member can be used as long as it can be elastically deformed, and it can be held without using a separator. Further, the plurality of floor members may be configured to have the same size so as to close the bottom opening.

FIG. 2 is a front view and a right side view of the ground-mounted low-pressure branching device according to the embodiment of the present invention. It is an AA line expanded sectional view of FIG. FIG. 3 is an enlarged sectional view taken along line BB of FIG. 2. FIG. 3 is an enlarged sectional view taken along line CC of FIG. 2. It is the top view and front view of the 1st floor member shown in FIG. It is the top view and front view of the 2nd floor member shown in FIG. FIG. 2 is a perspective view showing a cable introduction state in the ground-mounted low-voltage branching device shown in FIG. 1. It is a figure for explaining underground of a distribution line.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Ground-type low-pressure branching apparatus 1a Bottom opening part 2 Device main body 3 Base main body 3a-3d Flat part 4 Door 5 Branching equipment 6a-6f Connecting bolt 7 Separator 8 Holding plate 8a Holding hole 9 Bolt 11 First floor member 12 Second Floor member 11a, 12a hole 15U, 15V, 15W, 15N cable

Claims (3)

In a ground-mounted low-voltage branching device that introduces a cable passing through the ground from the bottom opening to the inside and distributes power,
In the bottom opening, a plurality of floor members elastically deformable so as to close the opening are provided such that opposing side surfaces of adjacent floor members are in contact with each other, and the cable is provided between the adjacent floor members. A low-pressure branching device installed on the ground, wherein the introduction portion is configured to be introduced by elastically deforming a side portion facing the introduction portion.   The ground-installed low-pressure branching device according to claim 1, wherein a plurality of separators for separating the cable to be introduced are provided in parallel in the bottom opening, and the floor member is held in each separator. .   The low-pressure branching device according to claim 1 or 2, wherein the floor member is made of a foam.

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