JPS5932968B2 - Connection part of rubber/plastic insulated cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in connections for rubber-plastic insulated cables.

Generally, at the connection part of a three-core cable, the conductor at the tip of each core cable is stripped in stages, the conductors on both sides are connected via a conductor connection tube, and the open part of this connection part is covered with an insulating layer.
After the cores are all fixed together and housed in the case, the case is filled with an admixture and the ends of the case are waterproofed.

The working procedure is as follows.

(1) Strip the cable core necessary for connection work from the 3-core cable.

(2) Strip off the tip over a distance necessary for insulation.

(3) Connect the cable conductors through conductor connection tubes.

(4) Insulate and reinforce the connected cable portion by wrapping it with tape or the like.

(5) The three cores are bundled and stored in a case, and the case is filled with a mixture.

(6) Finish by waterproofing the case terminal.

The problem with this work is that other phases get in the way during the conductor connection and insulation reinforcement work, making the work difficult, and for this reason, the cable core is exposed more than necessary and the three cores are expanded.

Therefore, the total length of the connection portion becomes longer (the cable portion becomes longer).

Because the three cores are spread out for work, the outer diameter of the connection part becomes larger.
The case becomes larger and the amount of filling mixture increases, leading to higher costs.

When the cable becomes long, it hangs down inside the case, making it impossible to fill the mixture uniformly, resulting in an unbalanced thermal resistance.Furthermore, the connection part becomes larger, which increases the number of work steps.

The present invention has been made in view of the above situation, and provides a connection section for rubber/plastic insulated cables that can reduce the number of man-hours for connection work, prevent deformation between cables, and facilitate insulation between phases. It is intended to.

The connection part of the rubber/plastic insulated cable of the present invention is
Peel off the coating on the opposing conductor ends of the 3-core cable, connect them via conductor connection tubes, form an insulating layer around the outer periphery of this connection, fix the 3 cores together, store them in a case, and mix them in the case. The axial side circumference of the cable is formed into a geometrically congruent shape, and the cable has a polyhedral shape with a predetermined thickness in the axial direction, and when fixed, the three cores are arranged in an equilateral triangle shape and are mutually connected. three holding members that are in contact with each other through joints, and a portion of each is inscribed in the inner periphery of the cylindrical case; approximately in the center of each of the three holding members, and When the holding members are arranged in equilateral triangular positions, the conductor connecting tubes are attached to the respective holding members at substantially equilateral triangular positions on the same circumference.

An embodiment of the connecting portion of the rubber/plastic insulated cable of the present invention will be described below with reference to FIGS. 1 and 2.

Reference numeral 1 denotes a holding member for the conductor connecting tube 2. Each of the three holding members 1 is formed into a polygonal shape whose side circumferences in the cable axis direction are geometrically congruent, and holds the conductor connecting tube 2 in the axial direction. It is formed into a polyhedral shape having a predetermined thickness necessary for the purpose of the invention, and is formed so that it can be placed in an equilateral triangular position.

The conductor connection pipe 2 has a communication port 5 into which a cable conductor (not shown) is inserted, and its outer periphery is coated with a coating layer 8 consisting of an insulating layer 4 and a semiconducting layer (or high resistance layer) 3 from the inside. .

Then, the conductor connecting pipe 2 holds each holding member 1 in the first position.
As shown in the figure, when the equilateral triangular positions l are placed in contact with each other via the joint 6, they are located at the center of the holding member 1 and on the same circumference γ in an equilateral triangular shape ( .

At this time, a portion of each holding member 1 comes into contact with the inscribed circle 9, respectively.

Therefore, the three conductor connecting pipes 2 are placed in a positional relationship with an interval of 120°.

The three junction points 6 are designed to maintain the distance between the three cores.

The cable can be connected by inserting terminals (not shown) from both sides of the communication hole 5t of the conductor connection tube 2 and crimping and fixing them from above the coating layer 8, or by connecting tulip contacts (not shown) to the conductor. Insert into the communication hole 5 of the tube 2 from both sides.

After the three conductors are connected by the conductor connecting tubes 2 with the holding members 1, and then housed in the cylindrical case 10 shown in FIG. Since it is formed in a shape, it is automatically fixed and held.

Further, a part of the row side of the valley holding member 1 is in contact with the inner peripheral surface of the cylindrical case 10, respectively.

In FIG. 3, 11 is a cable, 12 is a mutual cable, 13 is a stress cone, 14 is an admixture, and 15 is a prevention part.

In this way, the connection portion of the rubber/plastic insulated cable of this embodiment holds each of the three conductor connection tubes by a holding member, and the holding member has a polygonal shape that is geometrically congruent with the side periphery and has a predetermined shape. The three cores are held by inserting them into the case in an equilateral triangular position when fixed, and each conductor connection tube is held in an equilateral triangular position on the same circumference, so insulation between phases is automatic. This prevents deformation between the cables and clearly distinguishes the connected phases.

In addition, by dividing the conductor connecting tube into three pieces with a holding member, each of the three cores can be worked on separately, making it easier to connect conductors and handle them after connection, especially for large-sized conductors, small-sized and thick-walled cables. makes connection work extremely easy.

Further, after the holding member is housed in the case, the three-core cable is held at an independent position within the case by the contact points on the outer periphery, so that insulation reinforcement of the cable terminal portion can be reduced.

The shape of the holding member is arbitrary as long as it satisfies the above conditions, and the size and material can also be selected depending on the voltage class used.

In addition, in accordance with other assembly methods using the conductor connection pipes of this embodiment, if the cables are mutually terminally processed in advance and the conductors are connected sequentially for each phase, the terminals can be processed simultaneously and the process can be completed in a short time. .

4 and 5 respectively show other embodiments. In the embodiment of FIG. 4, when the insulation distance between the three cores is changed depending on the voltage class, the contact surface of the joint part 6 is formed to be relatively narrow. It is designed so that the distance can be easily changed by cutting it when the object is to be brought closer.

Furthermore, in the embodiment shown in FIG. 5, a shield (metal ground) 16 is attached to each joint 6 that separates the three cores from each other to prevent a short circuit between phases, and the embodiment shown in FIGS. Both examples have the same effects as the above embodiments.

As described above, the connection portion of the rubber/plastic insulated cable cable of the present invention has the effect of reducing the number of connection work, preventing deformation between the cables, and facilitating insulation between the phases.

[Brief explanation of the drawing]

Fig. 1 is a front view of the assembled state of a holding member that holds a conductor connecting tube of an embodiment of the connection part of the rubber/plastic insulated cable of the present invention, and Fig. 2 is a sectional view taken along the ■-■ arrow in Fig. 1. , FIG. 3 is a sectional view of the connecting portion when the cable is connected by the conductor connecting tube of FIG. 1, and FIGS. 4 and 5 are respectively a first embodiment of the connecting portion of the rubber/plastic insulated cable of the present invention. It is a front view of the same part as the figure. 1: Holding member, 2: Conductor connecting tube, 6: Joint portion, T: Circumference, 9: Inscribed circle, 10: Case, 11: Cable, 14:
admixture.

Claims (1)

[Scope of Claims] The coverings of the opposing conductor ends of each 13-core cable are peeled off and connected via conductor connection tubes, an insulating layer is formed around the outer periphery of the connected portion, and the three cores are fixed together and placed in a case. At the connection part of the rubber/plastic insulated cable which is housed and filled with a mixture in the case, the axial side circumferences of the cable are formed in a geometrically congruent shape and have a predetermined thickness in the axial direction. Three holding members each having a polyhedral shape and having three cores arranged in an equilateral triangular shape when fixed, contacting each other through joints and having a portion of each inscribed in the inner circumference of the cylindrical case. and the conductor attached to each of the three holding members at approximately the center of each of the holding members and at a substantially equilateral triangular position on the same circumference when the holding members are arranged in an equilateral triangular position. A rubber/plastic insulated cable connection part characterized by being provided with a connection pipe. 2. The connection portion of a rubber/plastic insulated cable according to claim 1, wherein a coating layer consisting of an insulating layer and a semiconducting layer or a resistive layer is formed from the inside on the outer periphery of the conductor connecting tube held by the holding member. 3. The connection portion of a rubber/plastic insulated cable according to claim 2, wherein the conductor fitted into the conductor connection tube is connected to the conductor connection tube by pressure contacting the coating layer on the conductor connection tube.