JP3317779B2 - Cable terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable terminal for plug-in connection.

[0002]

2. Description of the Related Art In recent years, as buildings have become higher in height and intelligent, and large-capacity power supply has become necessary, high-voltage cables with branches have been increasingly used for power distribution trunks in buildings.
FIG. 2 shows an example of a trunk line system in a building using such a high-voltage cable with a branch, from a main electric room 1 to a sub-electric room 3 provided on each floor while maintaining high pressure by a high-voltage cable 2 with a branch. The power is distributed, where it is transformed and power is supplied to each load equipment 5 by the low-voltage cable 4. In recent years, the branch section has been further improved in order to further enhance the workability of laying such a high-voltage main line system, and to allow partial replacement of the main line itself in response to an increase in load capacity in the building or a main line accident in the future. A trunk branching section has been developed in which a terminal section of a trunk cable preliminarily processed in a factory is plugged into this unit.

[0003] That is, as shown in FIG. 3, in the trunk branch portion, an inner periphery of a T-shaped branch conductor 6 having a branch cable conductor insertion hole 6 a and trunk cable conductor insertion holes 6 b and 6 c is formed. The branch unit 9 is formed by integrally molding the semiconductive layer 7a, the insulating layer 7b, and the external semiconductive layer 7c, and burying a connection fitting 8 having a thread groove 8a on the outer peripheral surface on the outer periphery of the main cable terminal portion connection side. Then, a plug 11 is connected to the branch unit 9 by compression-connecting a conductor end 10 exposed by stepping, and this is inserted and fixed in an insulating tube 12 made of EP rubber (ethylene / propylene rubber). Nut having a thread groove 14a on its inner peripheral surface, which is rotatably mounted on the outer periphery of the distal end portion of the insulating cylinder 12 while inserting the plug 11 into the branch conductor 6.
4 is screwed into the connection fitting 8 of the branching unit 9 so as to be electrically and mechanically connected.

[0004]

However, in such a terminal portion of the trunk cable at the trunk branch portion, as shown in FIG. 3, the insulating tube 12 and the plug 11 (the trunk cable 13) are first connected to the trunk cable. 13 is inserted into the insulating cylinder 12 by compression connection to the conductor end of the conductor 13.
After fitting a wedge-shaped stop ring 15b into a groove 15a provided in advance on the outer periphery of substantially the center of the plug 11, the stop ring 15b inserts the plug 11 into the inner peripheral surface of the insulating cylinder 12 before molding. Pull back until it comes into contact with the bottom of the fixing bracket 16 having a screw groove 16a on the peripheral surface, and then, on the outer peripheral surface, a screw groove 17 screwed into the screw groove 16a of the fixing metal 16
The structure is complicated and it takes time to assemble, for example, a structure in which the fastener 17 having a is inserted into the outer periphery of the plug 11 from the distal end side and fastened toward the main cable 13 to be fixed. there were. In addition, since many components having complicated shapes and structures such as the stop ring 15b and the fixing bracket 16 are required, there is a problem that the cost is increased. FIG. 4 is a cross-sectional view showing a process of assembling the fixing structure of the insulating tube 12 and the plug 11 in the terminal portion of the trunk cable shown in FIG.
Reference numeral 18 denotes a cable spacer, 19 denotes a contact, 20 denotes a metal shielding tape, and 21 denotes a protective fitting.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described conventional problems. The structure can be simplified, workability can be improved, and the number of parts having complicated shapes and structures can be reduced. It is an object of the present invention to provide a plug-in connection cable terminal that can significantly reduce cost and material cost.

[0006]

According to the present invention, there is provided a cable end portion comprising: a plug compressed and connected to a conductor end of a cable; and an insulating tube fitted over the plug and extending over the outer periphery of the core of the cable. A thread groove and a locking projection are provided on the outer peripheral surface of the plug at a distance from the distal end, while the inner peripheral surface of the insulating cylinder has substantially the same diameter as the outer diameter of the plug. A fixing ring having a plug insertion hole is embedded therein, and the fixing ring is tightened and fixed by a locking nut screwed into a screw groove of the plug and the locking projection, whereby the plug is fixed. And an insulating cylinder are fixed.

[0007]

In the cable terminal portion of the present invention, a screw groove and a locking projection are provided on the outer peripheral surface of the plug, while a fixing ring is embedded in the inner peripheral surface of the insulating cylinder, and the fixing ring is connected to the screw of the plug. The plug and the insulating cylinder are fixed by tightening and fixing with the tightening nut screwed into the groove and the locking projection. Since the structure is simple, it is easy and quick to assemble. be able to. In addition, the number of parts to be used is smaller and the shape and structure are simpler than those of the conventional one, so that the cost required for manufacturing and materials can be reduced, and the cost can be reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a terminal section of a 6.6 kV class CV cable applied to a trunk branch section of a trunk line system in a building as shown in FIG.

In FIG. 1, reference numeral 22 denotes an insulator 24 formed of cross-linked polyethylene on a conductor 23, an outer semiconductive layer 25 formed by extruding a semiconductive polyethylene composition, a shielding layer 26 formed by winding a copper tape, and The stepped end of a CV cable formed by sequentially applying a sheath 27 made of extruded vinyl chloride resin is shown.

At the end of the conductor 23, a plug 29 having a contact 28 mounted on the outer periphery of the distal end is compression-connected, and a screw groove 30 is provided on the outer periphery of substantially the center of the plug 29. Further, between the screw groove 30 and the compressed portion of the plug 29, a locking projection 32 for locking a fixing ring 31 described later is provided around.

Also, the cable insulator 2
An insulating cylinder 33 made of an internal semiconductive layer 33a and an insulating layer 33b (both made of EP rubber) is fitted and inserted in order from the inner side formed by integral molding over the top 4. Reference numeral 34 denotes a cable insulator 24 for diameter adjustment.
This is a cable spacer made of EP rubber attached to the end. A plug 2 is provided on the inner circumference near the tip of the insulating cylinder 33.
A fixing ring 31 having the same diameter as the outer diameter of the plug 29 that can be fitted into the plug 9 is embedded, and the fixing ring 31 is locked by a fastening nut 35 screwed into the screw groove 30 of the plug 29. By tightening toward the part 32, the plug 29
And the insulating cylinder 33 are fixed. In addition,
A tightening nut insertion hole 36 for inserting the tightening nut 35 is provided at the tip of the insulating cylinder 33.

Further, the insulating cylinder 33 on the outer periphery of the insulating cylinder 33 is provided.
Although not shown, a connection nut made of brass having a thread groove 38 on the inner periphery for connecting the cable terminal portion to the branch unit as shown in FIG. A semi-conductive tape 40 is wound around the cable shielding layer 26 from the rear end of the protective bracket 37, and an insulating tape 41 is wound around the outside thereof. ing. In FIG. 1, reference numeral 42 denotes a ground wire, 43 denotes a bind wire for fixing a ground wire conductor on the shielding layer 26, 44 denotes a heat-shrink tape mounted over the winding layer of the insulating tape 41, 45 and 4
6 is C for sealing and fixing both ends of the heat shrink tape 44.
This shows a sealing portion formed by a retaining ring and a vinyl chloride resin tape. Reference numeral 47 denotes a hole for a tightening tool used for assembling.

In order to form the cable terminal portion configured as described above, for example, first, the stepped-off cable end portion 2 is formed.
2. Insert a cable spacer from the end of
Attach on top. Next, the plug 29 is compression-connected to the end of the conductor 23 and inserted into the insulating cylinder 33 until the locking projection 32 of the plug 29 substantially abuts the fixing ring 31 of the insulating cylinder 33. Subsequently, the tightening nut 36 is connected to the plug 29.
The fixing ring 3 is inserted into the outer periphery and screwed into the screw groove 30.
1 is tightened and fixed toward the locking projection 32. As a result, the plug 29 and the insulating cylinder 33 are properly fixed at a predetermined position. Thereafter, the connection nut 39 previously inserted into the cable body side is pulled to a predetermined position on the protective fitting 37, and furthermore, the ground wire 42 is processed, the semiconductive tape 40 and the insulating tape 41 are wound, and heat is applied. Mounting the shrink tape 44,
By sequentially attaching the C-shaped retaining ring 45 and forming the sealing portion 46, the cable terminal portion having the above configuration is formed.

As described above, the cable terminal section of this embodiment has a much simpler structure than the conventional cable terminal section for the trunk branch section as shown in FIG.
It is easy to assemble and can greatly reduce the working time. In addition, the number of components used is small, and in particular, components that are difficult to manufacture such as the conventional stop ring 15 and fixing bracket 16 are not required, so that material costs and manufacturing costs can be reduced. Moreover, the insulating cylinder 29 and the plug 2
The fixing force between 9 is sufficient and the reliability is excellent.

Although the above embodiment is an example in which the present invention is applied to a cable terminal section used in a trunk branch of an internal trunk system in a building, the present invention is not limited to such an embodiment. It can be widely used for plug-in connected cables, for example, bypass cables and moving cables, and can provide good effects.

[0017]

As described above, according to the cable terminal of the present invention, the work time can be shortened because the structure is simple. Further, since it is not necessary to use many complicated parts, material costs and manufacturing costs can be reduced. Therefore, it is useful as a plug-in-connected cable terminal which is excellent in workability and economical.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a cable terminal according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an example of a trunk line system in a building using a high-voltage cable.

FIG. 3 is a cross-sectional view showing a trunk branch portion of a conventional in-building trunk system.

FIG. 4 is a sectional view for explaining the assembling process of the trunk cable terminal shown in FIG. 3;

[Explanation of symbols]

 22: End of CV cable stripped off 23: Conductor 29: Plug 30: Screw groove 31: Fixing ring 32: Locking protrusion 33: Insulating cylinder 35 ............ Tightening nut

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-47-4925 (JP, A) JP-A-3-56019 (JP, A) JP-A-5-83840 (JP, A) JP-A-5-83840 244715 (JP, A) Japanese Utility Model Application No. 3-54325 (JP, U) Japanese Utility Model Application No. 1-166428 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H02G 15/08 H02G 15 / 02

Claims (1)

(57) [Claims] 1. A plug compression-connected to a conductor end of a cable, and an insulating tube fitted over the outer periphery of a core of the cable from above the plug, and an outer peripheral surface of the plug is provided on a tip side. Screw grooves and locking projections are provided at more intervals, while a fixing ring having a plug insertion hole having substantially the same diameter as the outer diameter of the plug is embedded in the inner peripheral surface of the insulating cylinder. The plug and the insulating cylinder are fixed by tightening and fixing the fixing ring with a tightening nut screwed into the screw groove of the plug and the locking projection. And the cable terminal.