JPH11332079A - Insertion-type straight line connection part for power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily move a rubber insulation cylinder for assembly by providing recessed and projecting parts that adhere each other at final union positions on the outer surface of a spacer and the inner surface of the rubber insulation cylinder, and allowing one projection part to slide over the outer surface of the spacer and the conductor connection part or the inner surface of the rubber insulation cylinder. SOLUTION: Cable conductors 1 exposed by peeling off sheath stepwise are made to against each other, a conductor connection pipe 4 is covered and compressed, and a conductor connection part is formed, and a spacer 5 is placed on the cable sheath stepwise peeling off part at both sides of the conductor connection part. Then, a rubber insulation cylinder 6 is allowed to adhere onto it. After that, in the spacer 5, a projecting part 7 is formed at the outer surface end part of an insulation layer part in an axial direction and that of a semiconductive electric layer part, and a recessed part 9 is formed at the inner surface part of an inner semiconductive electric layer in a diametrical direction and that of an external semiconductive electric layer which is extended to an end part in an direction. Then, one projecting part 7 made to slide over the inner surface of the spacer 5 and the rubber insulation cylinder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber insulated cylinder in which a spacer is put on the outer periphery of a cable step stripping processing part which is present on a cable body side from a cable conductor connection part, and is inserted outside the spacer and the conductor connection part. The present invention relates to a pluggable straight-line connecting portion for a power cable, which is mounted by moving the cable in the axial direction.

[0002]

2. Description of the Related Art FIG. 2 shows a typical example of a conventional plug-in type straight connection part for a power cable, wherein 1 is a cable conductor, 2 is a cable insulator, 3 is a cable outer semiconductive layer,
4 is a conductor connection pipe, 5 is a spacer, and 6 is a rubber insulating cylinder.

In order to assemble the connecting portion, first, a stripping process is performed at the ends of both cables to be connected, so that the conductor 1, the insulator 2, and the outer semiconductive layer 3 are exposed stepwise. In addition, the rubber insulating cylinder 6 is inserted on one cable side (the main body side rather than the stripped portion), and a spacer having a two-layer structure of an insulating layer and a semiconductive layer is provided on the stripped portion of both cables. 5, the insulating layer covers the periphery of the exposed portion of the insulator 2 from the base of the exposed portion of the conductor 1, and the semiconductive layer covers the position of the exposed portion of the insulator 2 close to the external semiconductive layer 3. To The semiconductive layer of the spacer 5 and the semiconducting layer 3 outside the cable are subjected to conduction processing by a suitable conductive means.

After the spacers 5 are mounted as described above, the cable conductors 1 are butted against each other, and compression-connected using the conductor connection pipe 4. A conductive cover is put on the compressed conductor connection pipe 4, and an outer diameter process is performed according to the outer diameter of the spacer 5.

[0005] Next, the rubber insulating cylinder 6 previously inserted into the cable on one side as described above is moved in the axial direction of the cable, and the pre-processing connection in which the spacer 5 is mounted and the conductor 1 is connected. Move to the top and set. In this set state, the inner semiconductive layer of the rubber insulating cylinder 6 is in close electrical contact with the conductor connection portion, and the insulating layer of the rubber insulating cylinder 6 is in close contact with the spacer 5.

[0006] Finally, the entire connecting portion including the outer periphery of the rubber insulating cylinder 6 is subjected to insulation and waterproofing processing to complete the connection operation.

[0007]

The above-mentioned prior art; the plug-in straight-line connecting portion for a power cable shown in FIG. 2 has the following problems. That is, in this type of plug-in linear connection section, during the assembly work, the rubber insulating cylinder previously inserted on one side of the cable before conductor connection is moved in the cable axis direction, and the spacer is mounted and the conductor is connected. It is necessary to set a work on the connection part of the pre-processing including the connection, but such a connection part structure is a prefabricated structure as apparent from the above, and the outer diameter of the spacer 5 mounted inside the connection part and the movement For the inner diameter of the rubber insulating cylinder 6 requiring work, the difference in the set diameter is managed as the outer diameter of the spacer 5> the inner diameter of the rubber insulating cylinder 6 due to the connection structure, so that the spacer 5 and the rubber insulating cylinder 6 can be brought into close contact engagement. I have to.

When the rubber insulating cylinder 6 is moved in the cable axial direction under the above-described conditions, the rubber insulating cylinder 6 is inserted while the inner surface of the rubber insulating cylinder 6 is in full contact with the outer surface of the spacer 5. In addition, the lubricant on the spacer 5 is scraped off and the frictional force increases due to the entire surface of the fitting between the spacer 5 and the rubber insulating cylinder 6 being in contact with each other. It was difficult to assemble.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide a plug-in linear connection for a power cable, which can easily move and assemble a plug-in rubber insulating tube.

[0010]

SUMMARY OF THE INVENTION In the plug-in type straight connection portion for a power cable provided by the present invention, a spacer is put on the outer periphery of a cable step stripping processing portion present on a cable body side from a cable conductor connection portion. And a connection portion in which a plug-in type rubber insulating tube is attached to the outside of the conductor connecting portion by moving the cable in the axial direction, wherein the outer surface of the spacer and the inner surface of the rubber insulating tube are attached to each other at their final union position. An uneven portion is provided in close contact, and one of the convex portions can slide on the outer surface of the spacer and the conductor connecting portion or the inner surface of the rubber insulating cylinder.

[0011] As described above, the specific uneven portion is provided, so that the rubber insulating cylinder is moved onto the spacer from the point of time.
Insertion of the rubber insulating cylinder onto the spacer is performed while one of the protrusions contacts the inner surface of the rubber insulating cylinder or the outer surfaces of the spacer and the conductor connection portion. The insertion operation can be easily performed in a state where the entire mating surface does not contact, in other words, with low frictional force.

At the time when the rubber insulating cylinder is moved and inserted to the final set position, one of the convex portions is closely fitted to the other concave portion, and
From this point on, the entire surface of the fitting surface between the rubber insulating cylinder and the spacer is brought into contact.

In a preferred embodiment of the uneven portion, a convex portion is formed at each of both end portions of the outer surface of the spacer, and a concave portion is formed at each of the position near the center of the inner surface and the end portion of the rubber insulating cylinder so as to correspond thereto. Things.

Further, when the convex portion in the concave / convex portion has a petal shape that expands in the circumferential direction, the contact area of the convex portion with the mating side surface can be reduced, and the insertion resistance of the rubber insulating cylinder can be further reduced. .

[0015]

FIG. 1 shows a preferred embodiment of a pluggable straight connection for a power cable according to the present invention,
(A) shows the movement start state of the rubber insulation cylinder, (B) shows the state immediately before the end of the movement of the rubber insulation cylinder, and (C) shows the movement completion state of the rubber insulation cylinder.

As shown in FIG. 1 (c), the plug-in type straight connecting portion of this embodiment abuts on the conductor connecting tube 4 by abutting the cable conductors 1 exposed by the step stripping process, and compresses this. And a spacer 5 is mounted on the stripped portion of the cable on both sides of the conductor connection portion, and a plug-in type rubber insulating tube 6 is inserted and adhered onto the conductor connection portion and the spacer 5. Thus, a straight connection structure is formed.

The spacer 5 has a two-layer structure having an insulating layer and a semiconductive layer in the axial direction, and has a projection 7 at each of the outer end of the insulating layer and the outer end of the semiconductive layer. The rubber insulating cylinder 6 has a three-layer structure of an inner semiconductive layer, an insulating layer, and an outer semiconductive layer in the radial direction, and extends to the inner surface of the inner semiconductive layer and the end in the axial direction. The recess 8 is formed in each of the inner surfaces of the outer semiconductive layer. The convex portion 7 is formed in a petal shape that is developed in the circumferential direction so that the contact area with the mating contact surface when the rubber insulating tube is inserted is made as small as possible. One concave portion 8 is formed in a circumferential ring shape. , These convex portions 7 and concave portions 8
Is a mutual positional relationship in which the rubber insulating cylinder 6 can be fitted into and recessed with each other when it is at the final set position.

Now, in order to assemble the connecting portion having the above-described configuration, first, the end of the power cable to be connected is stepped off, that is, the cable conductor 1, the cable insulator 2, and the outer semiconductive layer 3 are removed. Exposure processing is performed step by step. Before connecting the conductor of the stripped cable, the rubber insulating cylinder 6 is inserted in advance on one cable (the cable body side from the stripped portion) (see FIG. 1A).

Further, spacers 5 are provided at the portions where the steps have been stripped.
Is attached. The mounting mode of the spacer 5 is such that its own insulating layer portion covers the cable insulator 2 from the base of the exposed portion of the cable conductor 1 in the cable step stripping portion, and its own semi-conductive layer portion strips the cable step. The cable is placed on the cable outer semiconductive layer 3 from the cable insulator 2 in the portion, so that the semiconductive layer and the cable outer semiconductive layer 3 can be electrically conducted.

After the spacers 5 are mounted as described above, the cable conductors 1 are butted against each other and compression-connected using the conductor connection pipe 4 as shown in FIG. A conductive cover is put on the compressed conductor connection pipe 4 and a spacer 5
The outer diameter processing is performed in accordance with the outer diameter.

After the connection of the cable conductors (compression connection by the conductor connection tube 4) and the attachment of the spacer 5 as described above to form the pretreatment connection portion, the rubber previously inserted on one side of the cable is used. The insulating tube 6 is moved in the axial direction of the cable (to the right in the drawing) and set on the pretreatment connection portion. FIG. 1A shows a state in which the rubber insulating cylinder 6 has begun to move to the pretreatment connecting portion; one end of the rubber insulating cylinder 6 is inserted into one of the preprocessing connecting portions (left side in the drawing) on the spacer 5. Shows when it is. At this point, the rubber insulation tube 6
The inner surface extending from one end of the outer semiconductive layer to the insulating layer is
The rubber insulating cylinder 6 is moved in the axial direction while being in contact with the protrusion 7 formed at the outer end of the insulating layer portion of the spacer 5.

Although not particularly shown, when the movement of the rubber insulating cylinder 6 is further promoted from the above-mentioned point, the inner surface of the inner semiconductive layer of the rubber insulating cylinder becomes a convex portion on the outer surface of the spacer 5 on the side of the insulating layer portion. 7 and the rubber insulating cylinder 6
The inner surface of the outer semiconductive layer on the moving propulsion end side of the
When the rubber insulating cylinder 6 further moves, the rubber insulating cylinder 6
The inner surfaces of the respective parts described above sequentially contact the semiconductive layer side protrusions 7 of the other (right side in the drawing) spacer 6.

FIG. 1B shows a state in which the movement of the rubber insulating cylinder 6 onto the pretreatment connection portion is just before the end, and at this time, the outer surface convex portions at both ends of the spacers 6 on both sides are shown. It can be seen that all of 7, 7, 7, 7 are in contact with the inner surface of the rubber insulating cylinder 6. As described above, since the inner surface of the rubber insulating tube 6 comes into contact with the convex portions 7 at both ends of each spacer 5 one after another,
The inner surface of the rubber insulating cylinder 6 does not contact the entire surface of the spacer 6 but slides with a smaller contact area.
As a result, the rubber insulating cylinder 6 can easily move on the spacer 5 to which the rubber insulating cylinder 6 is in close contact with a small frictional force.

FIG. 1C shows a state in which the rubber insulating cylinder 6 has been inserted into the final set position on the pretreatment connection portion. At this point, the inner half of the rubber insulating cylinder 6 near the center of the inner surface thereof is shown. The two recesses 8 and 8 in the conductive layer and the two recesses 8 and 8 in the outer semiconductive layers at both ends are respectively provided with spacers 6 and 6 on both sides.
The protrusions 7, 7, 7, 7 at both ends of the outer surface of the above are fitted and adhered, and all the inner surfaces of the rubber insulating cylinder 6 are tightly engaged with the outer surface of the spacer 5 and the outer surface of the conductor connection portion (semiconductive cover). Will do. In this close engagement, the inner semiconductive layer of the rubber insulating cylinder 6 is a conductor connecting portion (semiconductive cover).
The insulating layer of the rubber insulating layer 6 is in close contact with the insulating layer portion of the spacer 5, and the outer semiconductive layer of the rubber insulating layer is in close contact with the semiconductive layer portion of the spacer 5. And electrically connected to form a connection portion having predetermined electrical characteristics.

Although not particularly shown in the drawings, finally, the entire connecting portion including the outer periphery of the rubber insulating tube 6 is subjected to insulation and waterproofing processing to complete the connection operation.

[0026]

According to the present invention as described above, it is an object of the present invention to provide a plug-in linear connection portion for a power cable which can easily move and assemble a plug-in rubber insulating tube. ) Can be achieved.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an embodiment of a plug-in linear connection portion for a power cable according to the present invention, in which (a) shows a movement start state of a rubber insulating cylinder after conductor connection, and (b) shows a rubber insulation. Longitudinal section explanatory view showing the situation immediately before the end of the movement of the cylinder,
(C) is an explanatory longitudinal sectional view showing a state after the movement of the rubber insulating cylinder is completed.

FIG. 2 is an explanatory longitudinal sectional view showing an example of a conventional plug-in linear connection portion for a power cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable conductor 2 Cable insulator 3 Cable outer semiconductive layer 4 Conductor connection pipe 5 Spacer 6 Rubber insulating cylinder 7 Convex part (spacer side) 8 Concave part (rubber insulating cylinder side)

Claims (3)

[Claims] 1. A spacer is put on the outer periphery of a cable step stripping processing part which is present on a cable body side from a cable conductor connection part, and a plug-in type rubber insulating cylinder is inserted outside the spacer and the conductor connection part in the axial direction of the cable. A connecting portion configured to be mounted by moving the outer surface of the spacer and the inner surface of the rubber insulating cylinder are provided with concavo-convex portions that are in close contact with each other at their final united position, and one convex portion is an outer surface of the spacer and the conductor connecting portion. Or a power cable plug-in straight connection that allows the inner surface of the rubber insulation tube to slide. 2. The rubber insulation cylinder according to claim 2, wherein a convex portion is formed at each of both end portions of the outer surface of the spacer, and a concave portion is formed at each of a position near the center of the inner surface of the rubber insulating cylinder and an end portion thereof. The plug-in straight connection for a power cable according to claim 1. 3. The plug-in linear connection section for a power cable according to claim 1, wherein the projections in the projections and depressions have a petal shape that expands in a circumferential direction.