JPH05219638A - Branch joint for high voltage wire - Google Patents

Abstract

PURPOSE:To lead out a branch line easily in safety from a high voltage main line of about 6600V. CONSTITUTION:A conductive pin 3 planted on a conductive tube 2 in a branch tube 1 made of highly dielectric plastic is led out through a small hole 1b made through a branch part 1a of the branch tube 1. Conductors 4b, 4b connected with inner conductors 4a, 4a of two insulated wires 4 are inserted tightly into the conductive tube 2 and connected each other. Furthermore, a retaining rubber tube 5 applied on the wire 4 is pressed tightly, at the tapered outer peripheral surfaces thereof, against tapered inner peripheral surfaces 1c, 1c of the branch tube 1 through a resilient member 7 thus supporting the insulated wires 4, 4 tightly by means of the rubber tubes 5, 5 and preventing removal thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a branch connection device for a high-voltage electric wire, which is suitable for being attached to a step-down transformer for a power source of the wire-extending machine at a work site for drawing a special high-voltage electric wire.

[0002]

2. Description of the Related Art In order to extend a long extra-high voltage power cable for a length of 1,000 m or more, for example, 10 to 20 wire drawing machines must be arranged and operated.

If a power supply line for that purpose is installed with a three-phase alternating current of 200 V, the thickness of the cable becomes large, which is uneconomical and causes a negative effect such as a voltage drop.

[0004]

For this purpose, a step-down transformer is provided for each wire drawing machine, and the power supply is 6,600 V or 7,
Using a 700V line and reducing the voltage to obtain 200V can make the feeder line small in diameter and facilitate the work.

However, conventionally, there is no one that branches a high-voltage cable of about 6,600 V safely and easily and connects it to a transformer simply and safely.

An object of the present invention is to safely and easily branch a branch line from a high voltage main line of, for example, about 6600 volts.

[0007]

SUMMARY OF THE INVENTION The above-mentioned object of the present invention is to bury a conductive cylinder body substantially in the center of a branch cylinder formed of highly insulating plastic in a substantially T-shape and to implant a conductive pin on the outer peripheral surface thereof. In addition, the conductive pin is led out through the pores of the branch portion of the branch cylinder, and the conductors crimped and connected to the inner conductors of the two insulation-coated electric wires are respectively passed through the inner narrow inner surface of the branch cylinder and It is tightly inserted and connected to the conductive cylindrical body, and the pressing rubber cylinder having the tapered outer peripheral surface formed near each tip of the insulating covered electric wire is inserted respectively, and the tapered outer peripheral surface is respectively fitted to the inner narrow inner surface of the branch cylinder. By pressing the attached tubular body, the elastic member and the pressing lid fixed to the protective case of the branching cylinder in sequence, the insulating covered electric wire is firmly supported by the pressing rubber tube to reduce its diameter to prevent it from coming off. Give It can be achieved with the.

[0008]

[Operation] The outer inclined peripheral surface of the pressing rubber cylinder can be pressed firmly evenly through the inclined inner peripheral surface of the flanged cylinder by the elastic force of the elastic member inside the pressing lid fixed to the protective case of the branch cylinder. .

With this pushing force, the tapered outer peripheral surface of the pressing rubber cylinder can be uniformly and strongly pressed by the inner narrow inner peripheral surface of the branching cylinder, and since a large diameter reducing force is applied to most of the pressing rubber cylinder, the pressing rubber cylinder is pressed. In addition to the large friction coefficient of, the outer peripheral surface of the insulation-coated electric wire having the conductor inserted in the socket portion of the conductive cylinder in the branch cylinder can be pressed and supported by the pressing rubber cylinder, It is possible to secure the retainer for the branch cylinder.

In addition, since the live parts such as the conductive tube, the conductive pin, the inner conductor, and the conductor are tightly surrounded by the thick-insulation branch tube and the branch part, a leakage or electric shock accident may occur. Can be prevented.

It should be noted that the conductive cylinder in the branch cylinder is provided with 2 from both sides thereof.
By inserting the inner conductor conductor of the two electric wires, these two electric wires can be connected to each other and the branched output can be taken out from the conductive pin.

[0012]

EXAMPLES Examples will be described with reference to the drawings. First, as shown in FIGS. 1 and 2, the basic structure of the present invention is that a branch tube 1 formed of a tough and highly insulating plastic such as an epoxy resin in a substantially T-shape has a socket portion 2a of a good conductor substantially in the center thereof. The cylindrical body 2 is embedded, but the conductive pin 3 is previously planted on the outer peripheral surface of the cylindrical body 2 at the brazed portion 3a, and the conductive pin 3 is formed in the pore 1b of the branched portion 1a of the branch cylinder 1. After that, the conductive cylinder 2 and the conductive pin 3 are insert-molded in the branch cylinder 1.

A conductor 4 crimp-connected to the inner conductors 4a, 4a of the two high-voltage multiple insulation-coated wires 4 as shown in FIG.
b and 4b are tightly inserted and connected to the conductive cylindrical body 2 through the inner narrow inner peripheral surfaces 1c and 1c of the branching cylinder 1 as shown in FIGS. 1 and 5, and further near the tips of the insulation-coated electric wires 4 and 4. Pressing rubber cylinders 5, 5 each having a tapered outer peripheral surface 5a are inserted into the respective rubber plates as shown in FIG.

The tapered outer peripheral surfaces 5a, 5a are respectively formed on the inner narrow inner peripheral surfaces 1c, 1c of the branch cylinder 1 with a flanged cylindrical body 6 made of a strong insulating material such as epoxy resin, and a repellent spring such as a coil spring. As shown in FIG. 1, a member 7 and a holding lid 9 fixed to a protective case 8 made of a tough material adhered to the branch cylinder 1 are sequentially pressed, and tightly pressed as shown in FIG. By maintaining this pressing force with the elastic member 7,
The insulation-coated electric wires 4, 4 are supported by the pressing rubber cylinders 5, 5 with a sufficient contracting force to prevent them from coming off.

In each of FIGS. 1, 5 and 6,
Reference numeral o indicates a rubber O-ring for maintaining air-tightness and liquid-tightness, n indicates a screw, 1d indicates a lead wire connecting recess formed in the lower portion of the branching portion 1a, 2a indicates a connecting socket portion of the conductive tubular body 2 of gold or silver. It is plated with a good conductor such as.

Further, the reference numeral 5b indicates a pressing rubber cylinder 5.
Outwardly inclined surface, 6a is the collar of the flanged tubular body 6, and 6b is the collar 6
The inclined inner peripheral surface of a is an outer inclined surface 5 of the pressing rubber cylinder 5.
It is formed to match the shape of b.

T is a double-sided insulating tape, which has a property of keeping air-tight and liquid-tight by integrating over time, and further 10
Is a waterproof compound applied to the outer peripheral surface of the branch cylinder 1, and is a semicircular protective case that is divided into two in the vertical direction on the outer peripheral surface of the branch cylinder 1, and is covered with two screws 8 and 8 and then fixed with screws n. Previously, it is applied to the outer surface of the branch cylinder 1 by means such as coating or spraying.

Further, in FIG. 1, FIG. 7 and FIG. 8, a portion indicated by reference numeral 11 is an attached body such as a step-down transformer, and 11a is an electric wire clamper. Further, in FIG. 1, a high insulation pitch for high withstand voltage is filled in the branch recess 1d near the connection between the connection pin 3 and the covered electric wire w.

Next, the procedure for assembling the branch connection device for high voltage electric wires according to the present invention will be described in detail. First, the insulation coating near the tip of the insulation-coated wire 4 is partially removed as shown in FIG. 5 to expose the inner conductor 4a to a small extent, and the conductor 4b is exposed at this exposed portion.
After crimping and connecting them with a crimping tool, as shown in the same figure, the pressing lid 9, the flanged tubular body 6, and the pressing rubber tube 5 are sequentially inserted into the insulation-coated wire 4, and then the conductor 4b is inserted as shown in FIG. Is tightly inserted and connected to the connection socket 2a of the conductive cylinder 2.

Then, as shown in FIG. 6, at least three pieces or one large-diameter spring is put in the pressing lid 9 of the elastic member 7 in the state shown in FIG. As shown in Fig. 1, the cover 9 is tightly attached to the protective case 8 by tightening the screw n on the outer side to assemble.

Further, in the description of FIGS. 5 and 6, only the right side corresponding portion has been assembled, but the left side corresponding portion may be assembled in the same procedure as the right side.

Since the branch connection device according to the present invention has the above-mentioned structure, the elastic force of the elastic member 7 in the pressing lid 9 fixed to the protective case 8 of the branch cylinder 1 causes the flanged cylindrical body 6 to move. Outer slanted peripheral surface 5b of the rubber cylinder 5 pressed through the slanted inner peripheral surface 6a
It can be pushed evenly in the back direction evenly.

With this pushing force, the tapered outer peripheral surface 5a of the pressing rubber cylinder 5 can be evenly and strongly pressed by the inner narrow inner peripheral surface 1c of the branch cylinder 1, and a strong reducing force is exerted on most of the pressing rubber cylinder 5. In addition to the fact that the pressing rubber cylinder 5 has a large friction coefficient, the outer peripheral surface of the insulation-coated electric wire 4 having the conductor 4b inserted into the socket portion 2a of the conductive cylinder 2 in the branch cylinder 1 is described above. The pressing rubber tube 5 can be pressed and supported tightly, and the insulation-coated wire 4 can be prevented from coming off the branch tube 1.

In addition, the conductive cylinder 2, the conductive pins 3, the inner conductors 4a and the conductors 4b, and other live parts are tightly surrounded by the thickly-insulated branch tube 1 and its branch section 1a. Therefore, it is possible to prevent electric leakage and electric shock.

[0025]

Since the present invention is configured as described above, it has the following effects. Conductor 4a of wire inner conductor 4a inside conductive cylinder 2 inside branch cylinder 1 made of high insulation material
The two high-voltage coated electric wires 4, 4 can be connected to each other by inserting and the conductive pin 3 embedded in the conductive cylinder 2
Since the branch line can be drawn out and used via the cable, there is a first effect that the high-voltage electric wire can be branched and connected by a safe and easy operation.

By pressing the outer inclined peripheral surface 5b of the pressing rubber cylinder 5 uniformly in the inner direction by the elastic force of the elastic member 7, the tapered outer peripheral surface 5a of the pressing rubber cylinder 5 is pushed inside the branch cylinder 1 The peripheral surface 1c allows even and strong pressure to be applied, and since a large reducing force is applied to most of the pressing rubber tube 5, the friction coefficient of the pressing rubber tube 5 is large, and the insulating coated wire 4 There is also a second effect that it can be used safely because the outer peripheral surface is pressed tightly by the pressing rubber cylinder 5 and the stopper for the branch cylinder 1 can be secured.

In addition, the conductive tube 2, the conductive pins 3, the inner conductors 4a and the conductors 4b, and other live parts are tightly surrounded by the thickly-insulated branch tube 1 and its branch section 1a. Therefore, there is a third effect that it is possible to prevent electric leakage and electric shock.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing an example of this apparatus.

[Fig. 2] Bottom view of the above

3 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 4 is an enlarged sectional view taken along the line BB in FIG.

5 is an enlarged sectional view of an essential part showing an assembling sequence of the one shown in FIG.

FIG. 6 is an enlarged cross-sectional view of an essential part in a state different from that of FIG.

FIG. 7 is a side view showing an example of a step-down transformer to which the present device is applied.

FIG. 8 is an elevation view showing an example of a step-down transformer to which the present device is applied.

[Explanation of symbols]

 1 Branch cylinder 1a Branch part 1b Pore 1c Inner narrow inner peripheral surface 2 Conductive cylinder 3 Conductive pin 4 Insulated electric wire 4a Inner conductor 4b Conductor 5 Holding rubber cylinder 5a Tapered outer peripheral surface 6 Collared cylinder 7 Resilient member 8 Protective case 9 Holding lid

Claims (1)

[Claims] 1. A conductive cylinder body 2 is embedded in a branch cylinder 1 formed of a highly insulating plastic in a substantially T-shape in a substantially central portion thereof, and a conductive pin 3 is planted on the outer peripheral surface thereof. The conductors 4b and 4b, which are led out through the pores 1b of the branching portion 1a of the branching cylinder 1 and are crimp-connected to the inner conductors 4a and 4a of the two insulated covered electric wires 4, respectively, are the inner thin inner peripheral surface of the branching cylinder 1. 1c, 1c, and insert into the conductive tube 2 tightly,
Further, taper the outer peripheral surface near each tip of the insulation-coated wires 4, 4.
The pressing rubber cylinders 5, 5 formed with 5a are respectively inserted, and the tapered outer peripheral surfaces 5a, 5a are respectively attached to the inner narrow inner peripheral surfaces 1c, 1c of the branch cylinder 1 with the flange 6, the resilient member 7 and By pressing the holding lids 9 fixed to the protective case 8 of the branching cylinder 1 one after another in order, the insulation-coated wires 4, 4 are supported by the pressing rubber cylinders 5, 5 with a small diameter reduction to prevent them from coming off. Branch connection device for high voltage electric wires.