JP2002034137A - Low-voltage multi-branched device and multi-branched connecting body and pine needle shaped connecting body therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-voltage multi-branched device, capable of being branched easily from a trunk cable of low-voltage underground wiring cables, while maintaining minimum functions, with a simple structure and at a low cost, and to provide a multi- branched connecting body and a pine-needles shaped connecting body therefor. SOLUTION: This low-voltage multi-branched device comprises a multi-branched connecting body 14, provided with two trunk cable connecting parts 14a and a plurality of branch connecting parts 14b, by laying a plurality of cables under a condition of extending in one direction of the trunk cable 1, running inside a box 20 and by compressive-connecting one end of each cable with a metal body 14c and stage-stripping a free end on the other end side, the pine needle shaped connecting body 16, which connects one end of the trunk cable 1 cut into two portions inside the box 20 to the trunk cable connecting parts 14a in a pin needles shape, a trunk cable connecting member 12, which butt-connects the other end of the trunk cable 1 divided into two portions inside the box 20 to the trunk cable connecting parts 14a to connect drop cables, extending from respective customers to the branch connecting part 14b of the multi-branched connecting body 14 for power distribution.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-voltage multi-branch device, a multi-branch connector used therefor, and a pine needle-type connector. More specifically, a trunk line of a low-voltage underground wiring cable is drawn into a predetermined branch point. The present invention relates to a multi-branch low-voltage multi-branch device, a multi-branch connector used for the device, and a pine needle-type connector.

[0002]

2. Description of the Related Art Conventionally, the supply of electricity by a wiring cable has secured the power supply and safety in an urban area.
Particularly in recent years, undergrounding of distribution lines has become an important issue for reasons of urban aesthetics. In general, a low-voltage underground wiring cable that has been undergrounded in this way is converted from a high voltage (6.6 KV) to a low voltage (100 V, 200 V) by a transformer (transformer).
V, 400 V, etc.). Here, there are various types of power distribution systems for low-voltage underground wiring cables, such as a single-phase two-wire system, a single-phase three-wire system, a three-phase four-wire system, and a three-phase three-wire system. Three-phase, four-wire systems for delivering power to loads are most common. Then, the trunk of the low-voltage underground wiring cable is drawn into a low-voltage multi-branch device installed on the ground in either a sidewalk or a green belt, and branched to supply power to each customer. FIG. 12 is a diagram showing a conventional low-voltage multi-branch device installed on the ground such as a sidewalk or a green belt. FIG. 13 is a wiring diagram showing a wiring state of the low-voltage branching device shown in FIG. 12 underground. FIG. 14 is a connection diagram showing a state where the transformer 4 shown in FIG. 12 is wired by a three-phase four-wire distribution system shared by lights. FIG. 15 is a wiring diagram showing a wiring state when the trunk line is multibranched by the low-voltage branching device shown in FIG.

As shown in FIG. 12, the conventional low-voltage multi-branch device includes a power distribution box 6 installed on the ground such as a green belt 9 provided between a road 7 and a sidewalk 8 or a sidewalk 8.
In the distribution box 6, the trunk line 1 of the low-voltage underground wiring cable
To supply electricity to each customer. here,
As shown in FIG. 13, the trunk line 1 of the low-voltage underground wiring cable is changed from a high voltage (6.6 kV) to a low voltage (10 kV) by a transformer 4.
The voltage is reduced to 0 V, 200 V, 400 V, etc., and wired in a predetermined wiring system (for example, a three-phase four-wire system, a three-phase three-wire system, etc.) and placed in the distribution box 6 (the left distribution box shown in FIG. 13). I'm drawn into. At this time, as shown in FIG. 13, the transformer 4 and the power distribution box 6 include a concrete box 40 having a hollow portion having a predetermined size in the ground, and the trunk line 1 is connected via the concrete box 40. It is formed so as to draw in. Then, the trunk line 1 taken into the distribution box 6 via the transformer 4 is a new next distribution box 6 (the right distribution box shown in FIG. 13).
And a service line 2 for supplying power to predetermined consumers
And are wired separately.

In the conventional low-voltage multi-branch device having such a configuration, for example, when a voltage of 100 V / 200 V is supplied to each customer by using a three-phase four-wire wiring system commonly used for lighting, the transformer 4 is used. As shown in FIG. 14, a single-phase three-wire system for the lamp load and a three-phase three-wire system for the power load are unified into four wires (R, S, T, N) to simultaneously connect the lamp and electric power. Supply. Therefore, the transformer 4
Receives three primary distribution lines (high-voltage distribution line: 6.6 V) of three-phase AC as shown in FIG. 14, and forms a single-phase three-wire circuit between SNT phases on the secondary distribution line side. Phase 100/200
V is supplied to each of the three-phase circuits between the RST phases by 200 V.

[0005] In addition, as shown in FIG.
The power distribution box 6 extends four lines to the secondary side through the transformer 4.
And is connected to the inside of the power distribution box 6 by being drawn into the concrete box 40 provided underground. This distribution box 6
In this example, the service line 2 is selectively connected to the main line 1 to supply the customer with a low voltage of 100 V or 200 V (see FIG. 14). In addition, the distribution box 6
The trunk line 1 taken from the transformer 4 shown in FIG. 13 is further extended and supplied to a new next distribution box 6 (the right distribution box shown in FIG. 13).

By the way, the trunk line 1 extending four lines to the secondary side of the transformer 4 may have a shortage of trunk lines when supplying power to a plurality of consumers in an overcrowded urban area, for example.
Therefore, in the distribution box 6, as shown in FIG. 15, when supplying the trunk line 1 taken from the transformer 4 to a new next distribution box 6 (the right distribution box shown in FIG. 15), a plurality of branches are made in advance. Supply by that. here,
In the transformer 4 shown in FIG. 15, the secondary trunk line 1 (100/200 V) connected to the distribution box 6 has a number of cores (four line segments in FIG. 15) twisted into one electric line. A cable is used, and the distribution box 6 is connected with one thick cable. And in the distribution box 6,
The trunk line 1 from the transformer 4 is divided into 6 to 8 branches (8 branches in FIG. 15) according to the density of the consumers in the next distribution box 6 (the right distribution box shown in FIG. 15), and the next distribution is performed. It extends to the concrete box 40 provided in the box 6 and is pulled in. Therefore, in the next distribution box 6, it is possible to obtain the trunk line 1 according to the overdensity of the customers, and it is possible to prevent the shortage of the trunk line in an overcrowded area.

However, in such a conventional low-voltage multi-branch device, a branch connector (branch unit) for connecting the main line 1 in the distribution box 6 is formed by a rubber mold connector (not shown). Since the connecting portion of the drop wire 2 from the customer is formed by a rubber mold connector (not shown) which can be attached and detached in a live state, the entire apparatus becomes expensive and costly. Therefore, in the conventional low-voltage multi-branch device, when installed in a predetermined area where the density of consumers is relatively low in an area other than an overcrowded urban area, if there is no arrangement space such as a sidewalk or a green terrain near the customer, the trunk line Since it is necessary to extend and route the 1 (the trunk line having 6 branches to 8 branches shown in FIG. 15) and the drop line 2 long, the cost of the cable increases.

[0008]

As described above, in the conventional low-voltage multi-branching apparatus, when the distribution box 6 shown in FIG.
And a rubber mold connector for connecting the drop wire 2,
Since the distribution box 6 is installed in a placement space such as a sidewalk or a green terrain, and the concrete box 40 for drawing a trunk line is buried underground, the entire apparatus becomes expensive and the installation cost for installing the distribution box 6 increases. There was a problem of getting it. In addition, in the conventional low-voltage multi-branch device, particularly when installing in an area where the customers are scattered and the interval between the customers is large, it is difficult to set the interval at which the distribution box 6 is installed. Since the extension distance of the drop line 2 is increased and the underground wiring path for extending the trunk line 1 and the drop line 2 is also ensured, this also has a problem that the installation cost is high. SUMMARY OF THE INVENTION The present invention solves such a problem, and a low-voltage multi-branch device which can be easily branched from a trunk line of a low-voltage underground wiring cable, can maintain a minimum function, and can branch at a low cost with a simple structure, and a multi-purpose device used therefor. It is an object to provide a branch connector and a pine needle connector.

[0009]

In order to solve the above-mentioned problems, an embodiment of a low-voltage multi-branch device according to the present invention is as follows.
An apparatus for multi-branching a trunk line at a predetermined branch point where a trunk line of a low-voltage underground wiring cable extends, wherein a plurality of cable cores extend in a trunk line direction extending within the predetermined branch point, and one end is made of metal. A multi-branch connection body provided with two trunk connection parts and a plurality of branch connection parts by compressing and connecting the free end at the other end by a body, and a trunk divided into two parts by cutting the trunk in the box A pine needle-shaped connector that connects one trunk line to the trunk connection portion of the multi-branch connection in a pine needle-shape, and a trunk line that connects the other trunk line divided into two in the box to the trunk connection portion of the multi-branch connection body. A connection member is provided, and a branch line extending from each customer is connected to a branch line connection portion of the multi-branch connection body so as to distribute power.

Another embodiment of the low-voltage multi-branch device according to the present invention is an apparatus for multi-branching a trunk line at a predetermined branch point where a trunk line of a low-voltage underground wiring cable extends. A plurality of cable cores extending from the bottom toward the trunk line are provided in the location, one end of the bottom is compression-connected with a metal body, and the free end at the other end is stepped off to form two trunk connection portions and a plurality of A multi-branch connection body provided with a branch connection portion, and a trunk line connected in a state where the two trunk line connection portions extending from the bottom of the box are abutted to two ends obtained by cutting the trunk line into two portions in the box. A connection member is provided, and a branch line extending from each customer is connected to a branch line connection portion of the multi-branch connection body so as to distribute power.

Here, the branch line connecting portion of the multi-branch connecting body is
It is preferable to connect to a service line extending from a consumer via a fuse having waterproofness. Further, the multi-branch connection body and the pine needle-type connection body have a waterproof property, and it is preferable to provide a waterproof property by sealing a connecting portion connecting the trunk line and the drop-in wire with a sealing member such as a shrinkable tube. In addition, it is preferable that the branch point where the trunk is branched is the smallest box body capable of storing the multibranch connection, the pine needle-shaped connection, and the trunk connection member by connecting the trunk in the underground.
Further, in another embodiment of the branch point for branching the main line, it is preferable that a hollow portion such as a concrete box, a handhole, or a manhole formed for underground wiring is used.
The trunk line is a secondary (low-voltage) distribution line that is supplied from a primary (high-voltage) distribution line to a branch point by a distribution method such as a three-phase three-wire system or a three-phase four-wire system. 100V, 200V, 400V, 440V selectively connected to mains
It is preferable to obtain such a voltage. Further, it is preferable that the three-phase four-wire wiring system is a lighting shared three-phase four-wire distribution system that supplies voltages of 100 V and 200 V.

A multi-branch connector used in the low-voltage multi-branch apparatus according to the present invention is a multi-branch connecting body having two trunk line connecting portions, one end of which is stripped, and a plurality of branch connecting portions. A metal body having an insertion hole for inserting the plurality of cable cores and having the other end different from the stepped end of the cable core inserted for compression connection and a metal body for compression connection of the cable cores are housed. A canister-type container having insulating properties to be provided, and a sealing resin injected into the canister-type container and sealing a metal body and a part of a cable core wire, and sealing the inside of the canister-type container A plurality of loose ends of the cable core wire are provided so as to be exposed from one end of the resin.

Here, the sealing resin is an epoxy resin having curability, and it is preferable that the sealing resin is filled in a tea caddy type container to ensure waterproofness. In addition, the sealing resin is injected 70-80% into the tea caddy type container to seal and harden the cable core and the metal body, and then apply a release agent in the tea caddy type container to apply the release agent to the tea caddy type container. It is preferable to prevent the cracks in the tea caddy type container by refilling and filling the remaining portion of the container. Further, the tea caddy type container is preferably made of an insulator such as rubber or plastic. Further, it is preferable that the metal body is a sleeve that compresses one end of the cable core wire and electrically connects the sleeve.

A pine needle-type connector used in the low-voltage multi-branch device according to the present invention has a hollow body, is open at one end, and is integrally formed with a bifurcated limb at the other end. A branch pipe, a connecting body that inserts a predetermined cable from the branch limb of the bifurcated branch pipe and electrically connects in a pine needle shape at one end side opened through the body part, and a bifurcated branch of the connecting body connected with the cable And a cap that is housed in the body of the tube and seals one end.

Here, the connection body is preferably a connection body made of a conductor such as a C-type connector, a copper body with two holes, and an aluminum sleeve. In addition, the cap has an O-ring for waterproof treatment interposed between the bifurcated branch pipe and the cap when fitted and sealed at one end of the bifurcated branch pipe. It is preferable to securely seal by tightening with a band. Further, it is preferable that the cap is made of a plastic resin having a hardness of A100 or more having a Shore hardness durable against band tightening.
Further, the forked branch pipe is preferably made of a waterproof insulating material such as plastic resin or rubber.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a low-voltage multi-branching apparatus according to the present invention; FIG. FIG. 1 is a wiring diagram showing an embodiment of a low-voltage multi-branch device according to the present invention. FIG. 2 is a wiring diagram showing a state where the trunk line 1 shown in FIG. 1 is wired by one thick cable. FIG. 3 is a diagram showing details of the low-voltage multi-branch device shown in FIG. FIG. 4 is a cross-sectional view showing the internal structure of the main line connecting member 12 shown in FIG. FIG. 5 is a diagram showing the internal structure of the multi-branch connector 14 shown in FIG. FIG. 6 shows the multi-branch connector 1 shown in FIG.
FIG. 4 is a partially cut-away side view showing a state in which an assembly 4 is assembled. FIG. 7 is a diagram showing the internal structure of the pine needle type connector 16 shown in FIG. FIG. 8 is a diagram showing the A shown in FIG.
It is sectional drawing which shows the cross section of the -A line. FIG. 9 is similar to FIG.
9A and 9B are operation explanatory diagrams showing a connection operation when the trunk line 1 is branched by the low-voltage branching device 10 shown in FIG. 9A, where FIG. 9A shows a state in which the multi-branch connector 14 is mounted, and FIG. FIG. 9C shows a state in which the mold connecting body 16 is mounted.
Are shown respectively.

As shown in FIG. 1, an embodiment of the low-voltage multi-branch device according to the present invention is similar to the prior art shown in FIG. 15 in that a transformer 4 converts a high voltage (6.6 KV) to a low voltage (1 K).
00V, 200V, 400V, etc.) and a plurality of trunk lines 1 wired in a predetermined wiring system (for example, three-phase four-wire system, three-phase three-wire system, etc.) to a plurality of customers at predetermined branch points. A branch line 2 for power distribution and a trunk line 1 extending from a branch point to which the branch line 2 is connected to another branch point are separately wired. Further, the embodiment of the low-voltage multi-branch device according to the present invention differs from the prior art shown in FIG. 15 in that a box body 2 is provided at a predetermined branch location where a customer is located.
0 is embedded, and a plurality of (four in FIG. 1) trunks 1 wired from the transformer 4 are drawn into the box body 20 and branched. This low-voltage multi-branch device 10 includes:
A plurality of trunks 1 drawn from a transformer 4 are connected to a box 2
In the box body 20, a plurality of trunk lines 1 are attached to the trunk line 1. Therefore, in the present embodiment, the trunk line 1 is easily branched by the low-voltage multi-branch device 10 and the box body 20 without using the distribution box and the concrete box in the prior art shown in FIG. Power can be supplied.

Here, in the transformer 4 shown in FIG.
4 and 100V / 200V to each customer using the joint three-phase four-wire power distribution system as in the prior art shown in FIG.
In this case, a three-phase three-wire primary distribution line (high voltage: 6.6 V) is supplied to a single-phase three-wire circuit between SNT phases on the secondary distribution line side. 200V
Are supplied to the three-phase circuit between the RST phases, respectively. The trunk line 1 extending four lines from the transformer 4 to the secondary side embeds the box body 20 in a predetermined area where the density of customers is relatively low, and draws the box body 20 directly into a single-core branch. Is going. As described above, in the present embodiment, it is not necessary to route a plurality of trunks that are multi-branched by the distribution box as in the related art illustrated in FIG. 15, and it is possible to easily supply a voltage from the trunk 1 to a customer. it can. Also,
As shown in FIG. 15, the trunk line 1 extending four lines from the transformer 4 to the secondary side has a large number (for four lines) in one electric line.
As shown in FIG. 2, it is possible to freely wire the underground with only one trunk line 1 of a single thick cable by using a cable in which the cores are twisted.

The box body 20 is a small-sized installation basin, unlike a hollow box such as a concrete box, a handhole, or a manhole formed for underground wiring, and is buried underground. It is the smallest box that can be operated by inserting a hand from the ground. Therefore, the box body 20 can be easily installed in the vicinity of the customer and can supply the voltage freely.

Next, the details of the low-voltage multi-branch device 10 shown in FIG. 1 will be described in detail with reference to FIGS. Here, in FIGS. 3 and 9, for simplification of description, only a one-phase connection diagram of the four-wire secondary distribution line drawn into the box body 20 is shown. As shown in FIG. 3, the low-voltage multi-branch device 10 is configured such that a plurality of cable cores extend in the direction of the trunk line 1 of the low-voltage underground wiring cable drawn into the box body 20, and one end is compression-connected to the other end. 2 at the free end of the side
A multi-branch connection body 14 provided with a main trunk connection portion 14a and a plurality of branch connection portions 14b, and one of the main trunks 1 cut into two by cutting the trunk line 1 in the box body 20 are connected to the trunk line of the multi-branch connection body 14. A pine needle-shaped connector 16 connected to the connection portion 14a in a pine needle shape
And a main line connecting member 12 for connecting the other main line 1 bisected in the box body 20 to the main line connecting portion 14b of the multi-branch connection body 14 in a state where the main line 1 is abutted.

Here, as shown in FIG. 4, the trunk line connecting member 12 is crimped for compressing (caulking) the trunk line connecting portion 14a of the multi-branch connector 14 and the trunk line 1 in the box body 20 so as to face each other. It has a terminal 12a and an insulator 12b that insulates and covers the crimp terminal 12a. Therefore, the trunk line connecting part 14a and the trunk line 1 are electrically connected by the crimp terminal 12a, sealed by the insulator 12b, and treated in a waterproof state. Thus, the trunk line connecting member 12
Is connected by compressing the trunk line connecting portion 14a of the multi-branch connection body 14a and the trunk line 1 using the crimp terminal 12a.

As shown in FIG. 5, a plurality of connection branches 14 used in the low-voltage multi-branch device according to the present invention, in which the main line connecting portion 14a is connected to the main line 1 by the main line connecting member 12, extend as shown in FIG. A main line connecting portion 14a and a branch line connecting portion 14b are formed with a cable core wire to be connected, and one end of the main line connecting portion 14a and the branch line connecting portion 14b are attached (crimped) so as to be bundled with a hexagonally thick metal body 14c and electrically connected. The metal body 14c has a structure in which the metal body 14c is housed in a cylindrical container 14d having one end sealed. Here, the metal body 14c
As shown in FIG. 6, the epoxy resin 14e having curability, which is housed in a tea caddy type container 14d, flows into the filling width B position shown in FIG. 6 to be solidified, and then a release agent is applied. Then, a new epoxy resin 14e flows into the position of the filling width C again, and the inside of the tea caddy type container 14d is filled with the epoxy resin 14e. In this way, the epoxy resin 14e is divided into the filling width B and the filling width C for filling the tea caddy type container 14d, thereby preventing expansion at the time of solidification and preventing cracks at the same time, thereby ensuring reliable filling and waterproofing. The effect has been obtained. One end of the trunk line connecting portion 14a and the branch line connecting portion 14b are connected to the metal body 14c in the tea caddy type container 14d, and the free end of the other end is peeled off to expose the conductor 14f. As shown in FIG. 6, the conductor 14f is insulated by covering the cap 14g when not in use.

The branch line connecting portion 14b of the multi-branch connecting body 14 is connected to the service line 2 extending from each predetermined customer shown in FIG. At this time, it is desirable to interpose a fuse 18 in the branch line connecting portion 14b, as shown in FIG. Also, the trunk connection part 14a of the multi-branch connection body 14
, One main line 1 cut by the box body 20 shown in FIG. 3 is connected by the above-mentioned main line connecting member 12, and the other main line 1 is connected by a pine needle type connecting body 16.

As shown in FIG. 7, the pine needle-type connector 16 used in the low-voltage multi-branch device according to the present invention has a bifurcated branch limb 16a-2 integrated with one end of a cylindrical body 16a-1. And the forked branch pipe 16a
a C-type connector 16b for inserting the trunk connection portion 14a and the trunk 1 of the multi-branch connector 14 from the branch limb 16a-2 and electrically connecting at one end side of the body 16a-1; And a cap 16c for housing the inside of the body portion 16a-1 and sealing one end side. Here, the bifurcated branch pipe 16a is formed of a soft material such as rubber or plastic, and is provided so that the inside can be sealed and insulated. The forked branch pipe 16a is connected to the body 16
a-1 is sealed at one end with a cap 16c,
A packing 16d made of a soft material such as rubber is provided on the outer periphery of the cap 16c, and is formed so as to be sealed by a band 16e as shown in FIG. 8 when the cap 16c is mounted on the body 16a-1. The band 16e is made of a material such as nylon and formed in a band shape. Further, it is preferable that the cap 16c is made of a plastic resin having a Shore hardness of A100 or more, which has durability against tightening of the band 16e. Also, the body part 1
The C-type connector 16d housed in 6a-1 is connected to the trunk line connecting portion 14a and the trunk line 1 and then covered with an insulator 16g to be insulated. Also, the bifurcated branch pipe 16a
Presses the shrinkable tube 16f to the end of the branch limb 16a-2 in order to seal the inside.

Next, with reference to FIG. 9, the operation of branching the main line 1 using the embodiment of the low voltage multi-voltage branching device according to the present invention will be described in detail. As shown in FIG. 9, the trunk line 1 of the low-voltage underground wiring cable is cut off by a worker in a box body 20 provided in the ground to perform a branching process. Here, as shown in FIG. 9A, the trunk line 1 is taken out of the box body 20 and cut, and the trunk line connecting member 1 is cut.
2 connects to the trunk connection part 14a of the multi-branch connection body 14. At this time, the trunk line connecting member 12 connects the trunk line connecting portion 14a of the multi-branch connector 14 and the trunk line 1 with the crimp terminal 12a, and insulates the crimp terminal 12a with the insulator 12b. After that, the multi-branch connection body 14 is dropped and stored in the box body 20 in the direction of the arrow shown in FIG.

Further, the multi-branch connecting body 14 is
Is stored, as shown in FIG. 9 (b), the other trunk line 1 and the new trunk line connecting portion 14a of the multi-branch connector 14 are cut off.
To the outside of the box body 20 to cause the pine needle type connector 1
6 connect to each other. The trunk line connecting portion 14a and the trunk line 1 are respectively inserted into the branch limbs 16a-2 of the bifurcated branch pipe 16a and connected in a pine needle shape by the C-type connector 16b. The C-type connector 16b is insulated by an insulator 16g such as an AD tape, housed inside the forked branch pipe 16a, and attached with a cap 16c.
By fixing with e, the inside of the forked branch pipe 16a is sealed. The branch limb 16a-2 has a contraction tube 16f.
The sealing property is further improved by pressure bonding. Thereafter, the pine needle-shaped connector 16 is dropped and stored in the box body 20 in the direction of the arrow shown in FIG. 9B. And
In the box body 20, finally, the branch line connecting portion 14b extending from the multi-branch connecting body 14 is taken out, and as shown in FIG. 9 (c), the drop-in line 2 extending from a predetermined customer (see FIG. 1). Is connected via the fuse 18 to complete the connection operation.

As described above, according to the embodiment of the low-voltage multi-branch device, the multi-branch connection body and the pine needle-type connection body used in the present invention, as in the prior art shown in FIG. And the need for a concrete box to be buried underground becomes unnecessary, so there is no need to secure a space for installing the distribution box on the sidewalk or green belt, etc., and the economic effect is extremely large, and a significant cost reduction can be realized, and The structure in which the trunk line 1 is cut and components such as the multi-branch connector 14 are connected and dropped into the box body 20 makes it possible to easily wire the cut trunk line 1 without taking extra cable length.

Further, according to the embodiment of the low-voltage multi-branch device, the multi-branch connection body and the pine needle-type connection body according to the present invention, as described above, the arrangement space for installing the distribution box such as the sidewalk or the green belt is increased. Since it becomes unnecessary, even in an area where the density of consumers is relatively low, by embedding the small box body 20 in the ground, the trunk line 1 and the drop line 2 can be easily wired without extending long, and the trunk line 2 can be easily connected. The excavation cost and the cable cost of the wiring path for extending the service line 2 can be reduced.

Here, the embodiment of the low-voltage multi-branching apparatus according to the present invention, in which the main line 1 is branched using the main line connecting member 12, the multi-branch connecting body 14, and the pine needle type connecting body 16 in the box body 20, has been described. However, the trunk line 1 may be branched without using the pine needle type connection body 16. FIG. 10 is a diagram showing another embodiment of the low-voltage multi-branch device according to the present invention which does not use such a pine needle-shaped connector. Also, FIG.
FIG. 3 is a diagram showing in detail the low-voltage multi-branch device shown in FIG. Here, the low-voltage multi-branch device 30 shown in FIG. 10 is the same as the low-voltage multi-branch device shown in FIG. 3 except that no pine needle-type connector is used, and the same components are the same. The reference numerals are described, and duplicate description is omitted. FIG. 11 shows a box 2 for simplicity of explanation.
Only a one-phase connection diagram of the four-line secondary distribution line drawn to zero is shown.

As shown in FIG. 10, another embodiment of the low-voltage multi-branch device according to the present invention is similar to the low-voltage multi-branch device shown in FIG. A structure is provided in which a box body 20 is embedded, and a plurality of trunks 1 drawn from the transformer 4 are cut and connected in the box body 20. As shown in FIG. 10, a plurality of the low-voltage multi-branch devices 30 are mounted in the box body 20 in accordance with the trunk line 1. Also,
The low-voltage multi-branch device 30 differs from the low-voltage multi-branch device shown in FIG. 2 by providing a plurality of cable cores extending from the bottom toward the trunk line 1 in the box body 20 as shown in FIG. A multi-branch connector 14 having two trunk connection parts 14a and a plurality of branch connection parts 14b by compressing and connecting one end of the bottom and stepping off the free end of the other end; A main line connecting member 12 is provided at an end portion obtained by cutting 1 and divided into two, and connected to the two main line connecting portions 14a extending from the bottom of the box body 20 in a state of being abutted against each other. Therefore, in another embodiment of the low-voltage multi-branch device according to the present invention, the main line 1 and the drop-in line 2 can be connected using only the main line connecting member 12 and the multi-branch connecting body 14. Here, as shown in FIG. 10, a drop line 2 extending from each predetermined customer is connected to the branch line connection portion 14 b of the multi-branch connection body 14 in the box body 20. At this time, as shown in FIG. 11, it is desirable to interpose a fuse 18 in the branch line connecting portion 14b, preferably when connecting to the drop line 2.

According to another embodiment of the low-voltage multi-branch device thus formed according to the present invention, the box body 20
3, the main line 1 is cut off by the main line connecting member 12 and the multi-branch connecting body 14 to connect the main line 1 and the drop-in line 2, so that the same effect as the low-voltage multi-branch device shown in FIG. In addition to that, the connection work is facilitated and the cost can be further reduced by not using the pine needle-shaped connector shown in FIG.

Although the embodiments of the low-voltage multi-branch device, the multi-branch connector and the pine needle-type connector used in the present invention have been described in detail, the present invention is not limited to the above-described embodiments. It can be changed without departing from the gist of the invention. For example, although the embodiment of the low-voltage multi-branch device according to the present invention using the illuminating joint three-phase four-wire power distribution system has been described, the present invention is not limited to this.
The present invention is also applicable to 400 V power distribution by a wire distribution system. Further, the embodiment in which the low-voltage multi-branch device according to the present invention is provided in the box body has been described. However, the present invention is not limited to this. For example, a concrete box, a handhole, and a manhole can be applied to a hollow portion. is there.

[0033]

As described above, according to the low-voltage multi-branch device, the multi-branch connection body, and the pine needle-type connection body used in the present invention, an arrangement space for installing a distribution box on a sidewalk or a green belt on the ground is secured. Because there ’s no need to
The economic effect is extremely large, and a significant cost reduction can be realized. Further, it is not necessary to take extra cable length for the cut main line by cutting the main line and connecting parts such as multi-branch connectors and dropping it into the box body. Wiring can be easily performed. Further, according to the low-voltage multi-branch device, the multi-branch connection body, and the pine needle-type connection body used in the present invention, the above-mentioned space for distributing the distribution box is not required, so that even in an area where the density of customers is relatively low, the predetermined space can be obtained. By burying a small box body in the underground, wiring can be easily performed without extending the drop line and the trunk line, and the excavation cost and the cable cost of the wiring path extending the drop line and the main line can be reduced at the same time. be able to.

[Brief description of the drawings]

FIG. 1 is a wiring diagram showing an embodiment of a low-voltage multi-branch device according to the present invention.

FIG. 2 is a wiring diagram showing a state in which the trunk line shown in FIG. 1 is wired by one thick cable.

FIG. 3 is a diagram showing details of the low-voltage multi-branch device shown in FIG. 1;

FIG. 4 is a sectional view showing an internal structure of the main line connecting member shown in FIG. 3;

FIG. 5 is a diagram showing the internal structure of the multi-branch connector shown in FIG. 3;

FIG. 6 is a partially cutaway side view showing a state where the multi-branch connection body shown in FIG. 5 is assembled.

FIG. 7 is a view showing the internal structure of the pine needle type connector shown in FIG. 3;

FIG. 8 is a sectional view showing a section taken along line AA shown in FIG. 7;

FIG. 9 is an operation explanatory diagram showing a connection operation when a main line is branched by the low-voltage branching device shown in FIG. 3;

FIG. 10 is a diagram showing another embodiment of the low-voltage multi-branch device according to the present invention.

FIG. 11 is a diagram showing the low-voltage multi-branch device shown in FIG. 10 in detail.

FIG. 12 is a diagram showing a conventional low-voltage multi-branch device.

FIG. 13 is a wiring diagram showing a wiring state of the low-voltage branching device shown in FIG. 12 in the ground.

FIG. 14 is a wiring diagram showing a state where wiring is performed by the transformer shown in FIG. 12 by a three-phase four-wire distribution system commonly used for lighting.

FIG. 15 is a wiring diagram showing a wiring state when a trunk line is multibranched by the low-voltage branching device shown in FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Trunk line 2 Drop wire 4 Transformer 10 Low voltage branching device 12 Trunk line connecting member 12a Crimp terminal 12b Insulator 14 Multi-branch connection body 14a Trunk line connection part 14b Branch connection part 14c Metal body 14d Tea cylinder type container 14e Epoxy resin 14f Conductor 14g Cap 16 Matsuba type connector 16a Bifurcated branch pipe 16a-1 Body 16a-2 Branch crotch 16b C-type connector 16c Cap 16d Packing 16e Band 16f Shrink tube 16g Insulator 18 Fuse 20 Box body

Claims (19)

[Claims] 1. A low-voltage multi-branch device for multi-branching a trunk line at a predetermined branch point where a trunk line of a low-voltage underground wiring cable extends, wherein the cable core extends in the trunk line direction within the predetermined branch point. A multi-branch connection body provided with two main line connection parts and a plurality of branch connection parts by extending a plurality of ones, compressing and connecting one end side with a metal body, and peeling off the free end on the other end side; A pine needle-shaped connector for connecting one of the two trunk lines that are cut in the trunk line to the trunk connection portion of the multi-branch connector in a pine needle shape; and the other trunk line that is divided into two in the box. A main line connecting member that is connected to the main line connecting portion of the multi-branch connection body in a state where the main line connecting portion is connected to the main line connecting portion of the multi-branch connection body. A low-voltage multi-branch device provided. 2. A low-voltage multi-branch device for multi-branching a trunk line at a predetermined branch point where a trunk line of a low-voltage underground wiring cable extends, wherein the multi-branch device extends from a bottom toward the trunk line in the predetermined branch point. A multi-branch connection body provided with a plurality of cable core wires, one end of the bottom portion is compression-connected with a metal body, the free end of the other end is stripped, and two trunk connection portions and a plurality of branch connection portions are provided. A main line connecting member connected to an end portion obtained by cutting the main line in the box into two parts and abutting on two stepped main line connecting portions extending from the bottom of the box; A low-voltage multi-branch device characterized in that a branch line extending from each customer is connected to a branch line connection part of a branch connection body to distribute power. 3. The low-voltage multi-branch device according to claim 1, wherein the branch line connecting portion of the multi-branch connection body has a waterproof property for a drop line extending from the customer. A low-voltage multi-branch device which is connected via a fuse provided. 4. The low-voltage multi-branch device according to claim 1, wherein the multi-branch connection body and the pine needle-type connection body have waterproof properties, and contract a connection portion connecting the trunk line and the drop line. A low-voltage branching device, which is hermetically sealed by a sealing member such as a tube to provide waterproofness. 5. The low-voltage multi-branch device according to claim 2, wherein the multi-branch connection body has a waterproof property, and a connecting portion connecting the trunk line and the drop-in line is sealed with a shrinkable tube or the like. A low-voltage branching device characterized in that it is sealed by a member to provide waterproofness. 6. The low-voltage multi-branch device according to claim 1, wherein the branch point for branching the trunk line is configured such that the trunk line is pulled in the ground and the multi-branch connector is connected to the branch line. A low-voltage branching device, which is a minimum box body that can connect and store a pine needle-shaped connection body and a main line connection member. 7. The low-voltage multi-branch device according to claim 1, wherein the branch point for branching the trunk line is a concrete box, a handhole, or a manhole formed for underground wiring. A low-voltage branching device characterized by being a hollow part. 8. The low-voltage multi-branch device according to claim 1, wherein the main line is a three-phase three-wire system from a primary (high-voltage) distribution line.
A secondary (low-voltage) distribution line that is supplied to the branch point by a plurality of distribution systems such as a wire system, and the multi-branch connection body is selectively connected to the trunk line to be 100V, 200V, 400V.
A low-voltage branching device for obtaining a voltage such as V or 440 V. 9. The low-voltage multi-branch device according to claim 1, wherein the three-phase four-wire wiring system supplies a voltage of 100 V and 200 V. A low-voltage branching device characterized by a four-wire distribution system. 10. A cable core having a plurality of extending cable cores including two trunk connection parts and a plurality of branch connection parts, one end of which is stepped, and an insertion hole for inserting the plurality of cable cores. A metal body for inserting and compressing and connecting the other end side of the cable core wire that is different from the stepped end; a tea caddy type container having an insulating property for accommodating the metal body for compression connecting the cable core wire; and the tea caddy A sealing resin that is injected into a container and seals the metal body and a part of the cable core, and a step of the cable core from one end of the sealing resin that seals the inside of the tea caddy container. A multi-branched connector, wherein a plurality of peeled free ends are provided to be exposed. 11. The multi-branched connector according to claim 10, wherein the sealing resin is a curable epoxy resin.
A multi-branched connector characterized by ensuring waterproofness by filling the inside of the tea caddy type container. 12. The multi-branch connection body according to claim 10, wherein the sealing resin is injected into the tea caddy type container at 70 to 80% to seal and harden the cable core and the metal body. A multi-branched connector characterized by preventing the cracks in the tea caddy container by applying a release agent in the tea caddy container and injecting and filling the rest of the tea caddy container again. . 13. The multi-branch connector according to claim 10, wherein the tea caddy type container is made of an insulator such as rubber or plastic. 14. The multi-branch connection according to claim 10, wherein the metal body is a sleeve that compresses one end of the cable core and electrically connects the one end. 15. A bifurcated branch pipe having a hollow body, one end side being open and a bifurcated limb integrally formed on the other end side, and a predetermined cable extending from the bifurcated branch limb. And a connector that is electrically connected in a pine needle shape at one end side opened through the body portion, and the connection body connected to the cable is housed in the body portion of the bifurcated branch pipe and one end side is sealed. A pine needle-type connector comprising a cap for stopping. 16. The pine needle-type connector according to claim 15, wherein the connector is a connector made of a conductor such as a C-type connector, a copper body with two holes, and an aluminum sleeve. Type connection. 17. The pine needle-shaped connector according to claim 15, wherein the cap is inserted into one end of the bifurcated branch pipe and sealed, and is waterproof between the bifurcated branch pipe and the cap. A pine needle-type connector, which is provided with an O-ring for processing, and which is securely sealed by tightening one end of the bifurcated branch pipe with a band. 18. The pine needle-shaped connector according to claim 17, wherein the cap is made of a plastic resin having a hardness of A100 or more having a Shore hardness of durable to tighten the band. Matsuba-type connector. 19. The pine needle type connector according to claim 15, wherein the forked branch pipe is made of a waterproof insulating material such as plastic resin or rubber.