JPS6336616Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a branch connection section of a single-core twisted cable used as an indoor trunk line in a high-rise building or the like.

As a branch connection part of such a single-core twisted type cable, each core of the single-core twisted type cable to which the branch cable is electrically connected is arranged in parallel rows at a predetermined interval from each other, and the area around these branch connection parts is It is known that the structure is made by collectively molding a rubber/plastic insulating material.

However, in the above-mentioned connection part, a troublesome work of separating the wire cores is required to make each wire core parallel to each other, and this work is extremely difficult, especially in the case of a large-sized cable. In addition, since the above connection part has a structure in which the cores are arranged in parallel, the outer diameter of the connection part is inevitably large. When installing the cable in a cable, etc., there is also the problem that the floor through hole through which the cable is inserted must be made large.

The branch connection part of the single-core twisted type cable according to the present invention can eliminate the above-mentioned difficulties, and can be used for a single-core twisted type main cable made by twisting a plurality of single-core cable cores for the main line. The branch connection part of a single-core twisted type cable in which all the cores are connected to a branch cable via a branch sleeve for conductor connection is in a state where the cores are twisted and insulatively isolated from each other. A branch of a single-core stranded cable, characterized in that the branch connection portion is collectively molded and insulated by surrounding it with a mold and filling the mold with rubber or vinyl compound. Connection part.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of the branch connection part according to the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. 3 is a view taken along the - line in FIG. 1. .

In the figure, reference numeral 1 indicates a single-core twisted type cable for trunk lines, which is made by twisting together multiple single-core cables (for example, 2 to 4 cables); This shows a triplex type cross-linked polyethylene insulated vinyl sheathed cable (CVT cable) made by twisting 2, 2, 2 (2, 2, 2) at a predetermined pitch. Reference numerals 3, 3, and 3 are all branch cables provided along the above-mentioned cable 1, and one end of each is treated as a lead-out, and the lead-out conductor 3
1, 31, 31 are electrically connected to the conductor exposed portions 21, 21, 21 of the respective wire cores 2, 2, 2 via conductor connection branch sleeves 4, 4, 4, respectively. In this case, the cables 1 are branched and connected in a twisted wire core arrangement. It is preferable for the sleeve 4 to have a C-shaped cross section. Reference numeral 5 denotes a circular molded insulator that is integrally molded around the branch connection portion, and each branch connection portion can be hermetically surrounded by the molded insulator 5. This molded insulator 5 is usually obtained by molding a rubber or vinyl compound using a metal mold. 5
Reference numeral 1 denotes tapered portions formed at both ends of the molded insulator 5, which function as a guide when the cable 1 is inserted into a floor through-hole of a high-rise building or the like. Reference numeral 6 denotes a rubber/plastic insulating spacer having a Y-shaped cross section for insulatingly separating the twisted wire cores, and is fitted between the branch sleeves 4, 4, 4. It is preferable for the length of this spacer 6 to be longer than the entire length of the exposed conductor portion of the wire core 2 in terms of insulation. Further, an insulating tape is used as a substitute for the insulating spacer 6, and this is used as a substitute for the insulating spacer 6.
It is also possible to have a configuration in which it is wound upward.

In addition, in the above-mentioned embodiment, the branch cable 3 provided along the longitudinal direction of the single-core twisted cable 1 was drawn out only in the downward direction, but in the present invention, a configuration in which it is drawn out also in the upward direction, that is, a branch cable is provided. Of course, a configuration in which the branch cables are drawn out both upward and downward through the sleeve 4 may be used.

As mentioned above, when connecting a branch cable to all the cores of a single-fiber twisted type trunk cable made by twisting a plurality of single-core trunk cable cores, the branch connection part according to the present invention Since the cores are all molded and insulated, the overall shape of the branch connection can be further downsized, making it easier to install single-core stranded cables as trunk lines in high-rise buildings, etc., as described above. However, there is no problem that the cable penetration hole provided in the floor of the building is inevitably large. Furthermore, since the insulation treatment is performed in one molding operation, there is an advantage that the sealing performance is good and it can be prefabricated.

In addition, the branch connection part of the present invention can be used for branch connection by simply providing a small gap between the cores of a single-core twisted cable in which a branch sleeve for connecting the conductor can be inserted. Even large-sized single-core twisted type cables can be branched and connected without difficulty. Therefore, there is no need to perform the troublesome core separation work as in the conventional method described above.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the branch connection part according to the present invention, FIG. 2 is a view taken along the - line in FIG. 1, and FIG. 3 is a view taken along the - line in FIG. 1. . In the figure, 1 is a single-core twisted cable, 2,
2, 2 is a wire core, 3, 3, 3 is a branch cable, 4 is a branch sleeve, 5 is a molded insulator, and 6 is an insulating spacer.

Claims (1)

[Scope of utility model registration request] All branches of a single-core twisted type cable, which is made by connecting a branch cable to all cores of a single-core twisted type trunk cable, which is made by twisting multiple single-core cable cores for a trunk line, via a branching sleeve for connecting conductors. The branch connection portion is surrounded by a mold so that the connection portion is arranged in a twisted wire core arrangement and insulatively isolated from each other, and the mold is filled with rubber or vinyl compound. A branch connection section for a single-core twisted cable, characterized in that the cables are molded and insulated all at once.