JPS62210818A - Power cable jointing parts and manufacture of the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connecting component used inside a power cable junction box, etc., and a method for manufacturing the same.

[Conventional technology]

Conventionally, as this type of connection component, there is one in which a mix formed around a connection conductor is made of epoxy resin, and a metal case is attached around the mix to protect the resin from external force and water intrusion.

The above-mentioned metal case can be assembled after resin molding, or set in a mold during molding and integrated at the same time as resin molding. However, the latter method has the problem that the resin and metal case tend to separate, and residual stress during molding concentrates on the edges of the metal case, causing cranks to occur at the edges due to thermal distortion after molding. For,
The former method is currently used.

[Problem that the invention seeks to solve]

However, even with the former method, there is a problem that the epoxy resin molding process takes a long time, and after assembling the metal case,
It is necessary to pack an epoxy compound between the metal case and the resin molded product, which causes problems such as an increase in the number of processing steps, which increases manufacturing costs.

This invention aims to solve these problems.

[Means for solving problems]

In order to solve the above-mentioned problems, the invention related to a connecting part is such that the insulating layer is formed by molding a rubber material, and thereby the connecting conductor and the metal case are integrated.

In addition, the invention relating to the method for manufacturing the connecting part forms a molding cavity having a molded part of the tapered part for connection by a mold consisting of a combination of an inner mold and an outer mold surrounding the inner mold, and the center of the molded part A connecting conductor is set in the part, a metal case is set around it at a required interval, and then a rubber material is injected into the molding cavity.

〔Example〕

The first embodiment shown in FIG. 1 shows a female type connecting part, in which a shielding member 2 made of conductive rubber is fitted in the center part of a pipe-shaped connecting conductor 1, and the shielding member 2 is fitted around the shielding member 2. An insulating layer 3 molded from a rubber member such as ethylene propylene rubber (BP rubber) is formed, and a metal case 5 having a semiconductive rubber layer 4 on the inner peripheral surface is integrally formed around the insulating layer 3. ing. The metal case 5 and the semiconductive rubber layer 4 on its inner peripheral surface are integrated with the m-edge gap 3 during rubber molding.

A concave tapered part 6 is formed on both end faces of the shield member 2 and the insulating layer 3, with the connecting conductor 1 being exposed at the center, and the shield member 2 is formed from the actual end face of the tapered part 6 and the end face thereof. It forms the corner part of the part that transitions to the tapered surface. This shield member 2 alleviates disturbances in the electric field between the end portion of the cable conductor fitted into the tapered portion 6, other convex connecting parts, and the like.

The semiconductive rubber layer 4 formed on the inner surface of the metal case 5 may be omitted. However, when the injected rubber contracts during cooling, the rubber on the metal case 5 side is pulled toward the conductor 1 side,
Since there is a possibility of peeling, it is desirable to provide the semiconductive rubber layer 4 in order to eliminate such a risk. Moreover, if silicone rubber that cures at room temperature is used as the material for the insulating layer 3 instead of providing the semiconductive rubber layer 4, the above-mentioned fear of peeling can be completely eliminated.

Note that 7 in the figure indicates an inlet for injecting the rubber material during rubber molding.

In the second embodiment shown in FIG. 2, an injection tube 8 is provided protruding from the center of the connecting conductor 1, and this portion is provided so as to open on the outer surface of the shield member 2. In this case, as will be described later, the rubber material is injected from one end of the connecting conductor 1 through the injection tube 8.

The other configurations are the same as those of the first embodiment.

The third embodiment shown in FIG. 3 shows a male connecting part. In this case, a metal case 5 having the same insulating layer 3 and semiconductive rubber N4 around the connecting conductor 1 is used.
are integrated by rubber molding, and convex tapered connecting portions 6 are formed on both end faces, and all of the connecting conductors 1 are pushed into the inside of the insulating layer 3. In this case, the above-mentioned shield member is not necessary because the connection partner is shown in Figure 1.
This is because a shield member 2 as shown in FIG. 2 is attached.

Further, the necessity of the semiconductive rubber layer 4 and the fact that silicone rubber can be used as the rubber material for the insulating layer 3 are the same as those described above.

In the fourth embodiment shown in FIG. 4, an injection port 8' is formed in the center of the connection conductor 1, and as will be described later, rubber material is injected from one end of the connection conductor 1 through the injection port 8'. It is designed to inject.

Next, a method of manufacturing the connecting parts of each of the above embodiments will be explained.

FIG. 5 shows a manufacturing mold of the first embodiment. The mold consists of a pair of opposing inner molds 9.9 and an outer mold 10 assembled around them in a cylindrical shape.

The inner mold 9 has a truncated conical molding part 11 for forming the above-mentioned concave taper part 6, and the molding part 11
A fitting part 12 for the metal case 5 is formed on the outer periphery of the hem. In addition, an insertion hole 13 for the connection conductor 1 is formed in the distal end surface of the truncated conical portion 11 .

The procedure for molding using the above mold is to first mold the shield member 2 made of semiconductive rubber onto the connecting conductor 1, set it in the insertion hole 13 of the inner mold 9. A metal case 5 in which a semiconductive rubber layer 4 has been molded in advance is set in the fitting part 12.

After that, the outer mold 10 is assembled to form the required molding cavity 14.
After that, a rubber material is injected through the injection port 15 of the outer mold 10 and the injection lower of the metal case, and molding is performed.

FIG. 6 shows a manufacturing mold according to the second embodiment, in which a nozzle 15' having an injection path 14 is formed in the center of the insertion hole 13 provided in the molding part 11 of one inner mold 9. By inserting the nozzle 15' into one end of the connecting conductor 1, the nozzle 15' is brought into communication with the injection cylinder 8. Further, a blocking plug 16 to be inserted into the connecting conductor 1 is formed at the center of the molding part 11 of the other inner mold 9.

The shield member 2 in this case is molded around the injection tube 8 in the central part of the connecting conductor 1. The configuration other than these is the same as that shown in FIG. 5, and the rubber material is injected through the injection path 14 described above.

FIG. 7 shows a manufacturing mold of the third embodiment, in which the inner molds S, S are formed with four truncated conical molding parts 11' for molding the convex tapered part 6, A protrusion 17 for supporting the connection conductor 1 is formed at its center.

The other configurations are substantially the same as those in FIG. 5.

FIG. 8 shows a manufacturing mold according to a fourth embodiment, in which an injection path 18 is provided at the center of one protrusion 17 and communicates with an injection port 8'. The rest of the configuration is the same as that in FIG. 7.

〔Effect of the invention〕

As described above, since the insulating layer of the connecting component of the present invention is made of a rubber material, the adhesion between the connecting conductor and the metal case is good, and there is no risk of cracking due to thermal strain. effective.

Furthermore, since a metal case is attached, mechanical strength similar to that of conventional epoxy resin cast products can be obtained, and there is no risk of cracking due to handling or external damage during manufacturing.

Another invention, the manufacturing method, uses a rubber material,
Since the method of injecting the rubber material after the connecting conductor and metal case are set in the mold is used, manufacturing costs are low.

[Brief explanation of drawings]

1 to 4 are sectional views of the first to fourth embodiments;
FIGS. 8 to 8 are cross-sectional views of manufacturing molds of the first to fourth embodiments. 1... Connection conductor, 3... Insulating layer, 4
... Semi-conductive rubber layer, 5 ... Metal case, 6 ... Molding part, S ... Inner mold, 1
0... Outer mold, 11.11'... Molding part, 12... Fitting part, 13... Insertion hole, 14... ...Molding cavity. Patent applicant: Sumitomo Electric Industries, Ltd. Agent: Kama 1) Text 2 - 1 History - ■ C) ■ C"J

Claims (4)

[Claims] (1) In a power cable connection component in which a connecting taper portion is formed at both ends of an insulating layer formed around a connecting conductor, and a metal case is placed over the outer periphery of the insulating layer, the insulating layer is made of a rubber material. A connecting part for a power cable, characterized in that it is formed by molding, thereby integrating a connecting conductor and a metal case. (2) Claim 1, characterized in that a semiconductive rubber layer is formed on the inner surface of the metal case by molding.
Connecting parts for power cables as described in section. (3) Forming a molding cavity having a molded part of a connecting taper part using a mold consisting of a combination of an inner mold and an outer mold surrounding it, and setting a connecting conductor in the center of the molded part, A method of manufacturing a power cable connecting part, which comprises setting a metal case around the metal case at a required interval, and then injecting a rubber material into a molding cavity. (4) The method for manufacturing a power cable connection component according to claim 3, characterized in that a semiconductive rubber layer is formed in advance on the inner surface of the metal case.