JP2010086837A - Cable with branch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cable with a branch, which can prevent its fire-resisting performance from being deteriorated. <P>SOLUTION: In the cable 21 with a branch cable, after connecting conductors each other by removing a portion of each coating of a main cable 22 and a branch line cable 24, a conductor protecting portion 35 having a fire-resisting layer 36 and an insulating layer 37 is formed on the outside of the connecting portion 34 of the conductors, and a jacket protecting portion 39 is formed outside the conductor protecting portion 35. In the conductor protecting portion 35, the fire-resisting layer 36 is formed by winding of a fire-resisting tape, and the insulating layer 37 is formed by winding of a glass-based tape. The jacket protecting portion 39 has a protective layer 40 formed by winding of the glass-based tape and the fire-resisting tape. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cable with a branch (branch cable for a refractory circuit) used as a trunk cable for an emergency circuit such as a building, an apartment house, a factory, a school, and a tunnel.

  A cable with a branch is a series of cables in which the connection processing between the trunk cable and the branch cable is performed in advance in the factory, and it is necessary to save labor on site, shorten the construction period, and achieve high reliability in wiring work. (For example, Patent Document 1 below is helpful).

  In FIG. 3, the cable with branch 1 includes a main line 3 formed by twisting a plurality of main line cables 2 and a branch line 5 formed by twisting a plurality of branch line cables 4. The trunk line 3 and the branch line 5 are connected in the middle of the trunk line 3 to form a branch connection portion 6.

  Reference numeral 7 in the trunk cable 2 indicates a trunk-side conductor, and reference numeral 8 indicates a trunk-side insulator (a cable refractory layer (not shown) is provided between the trunk-side conductor 7 and the trunk-side insulator 8). . On the other hand, reference numeral 9 in the branch line cable 4 indicates a branch-side conductor, and reference numeral 10 indicates a branch-side insulator (a cable refractory layer (not shown) is also provided between the branch-side conductor 9 and the branch-side insulator 10). ing).

In the branch connection part 6, the main line side conductor 7 and the branch side conductor 9 are connected by the compression connector 11 (a conductor connection part is formed). This conductor connection portion is covered with a refractory layer 12. An insulating layer 13 is provided on the refractory layer 12. The branch connection portion 6 has a shaping layer 14 outside the fireproof layer 12 and the insulating layer 13. A resin mold 15 is applied to the outside of the shaping layer 14. The fireproof layer 12 is formed by winding a fireproof tape (mica composite tape). The insulating layer 13 is formed by winding a vinyl tape. The shaping layer 14 is formed by winding a self-bonding tape.
JP 2002-42563 A

  In the structure of FIG. 3, if burned due to a fire or the like, the following problems are concerned. That is, when the resin mold 15 and the shaping layer 14 are melted and external pressure such as a cable support (not shown) is directly applied to the refractory layer 12, the insulating layer 13, the trunk-side insulator 8, and the branch-side insulator 10, There is a possibility that damage may be caused by this, which may lead to deterioration of fire resistance, which is a concern.

  This invention is made | formed in view of an above-described situation, and makes it a subject to provide the cable with a branch which can aim at prevention of deterioration of fireproof performance.

  The branched cable according to the first aspect of the present invention, which has been made to solve the above-mentioned problems, removes a part of each covering of the trunk cable and the branch cable and connects the conductors to each other. In the cable with branch formed by forming a conductor protection part having a fireproof layer and an insulator layer on the outside, and further forming an exterior protection part that covers the coating removal part outside the conductor protection part, the conductor protection part The fireproof layer is formed by winding a fireproof tape, and the insulator layer is formed by winding a glass-based tape, and the exterior protection portion is a protective layer formed by winding the glass-based tape and the fireproof tape. It is characterized by having.

  According to the present invention having such a feature, the conductor protection portion has a two-layer structure of a fireproof layer formed of a fireproof tape and an insulator layer formed of a glass-based tape. On the other hand, an exterior protection part has a protective layer formed of a glass-based tape and a fireproof tape, and this protective layer has a configuration and structure of two types of tapes.

  The branched cable of the present invention according to claim 2 is the branched cable according to claim 1, wherein the protective layer is formed by winding a glass tape on the first layer and the fireproof tape on the second layer. The third layer is formed by winding a glass-based tape.

  According to the present invention having such a feature, the exterior protection part has a protective layer having a layer structure in which a layer of a refractory tape is sandwiched between layers of a glass-based tape.

  The branched cable according to the third aspect of the present invention is the branched cable according to the first or second aspect, wherein the protective layer also has a function as a shaping layer for resin molding on the outside. It is characterized by.

  According to the present invention having such characteristics, the exterior protection part has a configuration including a protective layer and a resin mold. The protective layer is shaped to facilitate injection molding (resin mold molding) when molding the resin mold.

  According to the first aspect of the present invention, first, as an effect of the conductor protection portion, the fireproof layer can protect from heat and flame. Moreover, an insulator layer can maintain insulation reliably as a result that this glass-type tape does not melt | dissolve with a heat | fever by using a glass-type tape. The insulating layer can protect the inner side even when the glass-based tape is cured by heat and thus receives external pressure. Next, as an effect in the exterior protection part, since the protective layer has a configuration and structure of two types of tapes, it can protect from heat and flame, and can also protect from external pressure. Therefore, according to the present invention, it is possible to prevent deterioration in fire resistance.

  According to the second aspect of the present invention, there is an effect that the protection from heat and flame and the protection from external pressure can be improved.

  According to the third aspect of the present invention, there is an effect that it is easy to perform injection molding when molding a resin mold. Moreover, there exists an effect that a cable shape can be stabilized.

  Hereinafter, description will be given with reference to the drawings. FIG. 1 is a view showing an embodiment of a cable with branches according to the present invention. FIG. 2 is a diagram schematically showing the processing structure of the branch connection portion, where (a) is a diagram of the processing structure of the conductor connection portion, and (b) is a diagram of the processing structure of the sheath removal portion (exterior protection portion). It is.

  In FIG. 1, reference numeral 21 indicates a cable with a branch (branch cable for a fireproof circuit) according to the present invention. The branched cable 21 is used as a trunk cable of an emergency circuit for buildings, apartment houses, factories, schools, tunnels, and the like. The branch cable 21 includes a trunk line 23 formed by twisting a plurality of trunk line cables 22 and a branch line 25 formed by twisting a plurality of branch line cables 24. The trunk line 23 and the branch line 25 are connected in a state where a part of the covering is removed in the middle of the trunk line 23 to form a branch connection portion 26.

  In the trunk cable 22, reference numeral 27 indicates a trunk-side conductor, reference numeral 28 indicates a cable refractory layer, and reference numeral 29 indicates a trunk-side insulator. On the other hand, the branch line cable 24 has the same configuration, in which reference numeral 30 indicates a branch-side conductor, reference numeral 31 indicates a cable refractory layer, and reference numeral 32 indicates a branch-side insulator.

  1 and 2, in the branch connection portion 26, the main line side conductor 27 and the branch side conductor 30 are connected by the compression connector 33 to form a conductor connection portion 34. The conductor connection portion 34 is protected by a conductor protection portion 35 that is one of the features of the present invention. The conductor protection portion 35 is a portion provided outside the conductor connection portion 34, and has a configuration and a structure including a refractory layer 36 and an insulator layer 37.

  The fireproof layer 36 is formed by winding a fireproof tape. Specifically, in the case of this embodiment, it is formed by winding a double-sided film mica tape, which is formed by adhering laminated mica to a polyethylene film, four times 1/2. The refractory layer 36 has a length up to the boundary between the cable refractory layer 28 and the trunk-side insulator 29 and the boundary between the cable refractory layer 31 and the branch-side insulator 32, as shown by dimension A in FIG. (The length is assumed to be an example). The tape width is set according to the size of the compression connector 33.

  The insulator layer 37 is formed on the refractory layer 36 by winding a glass tape (a glass tape is used instead of a conventional vinyl tape). Specifically, in the case of this embodiment, a glass cloth adhesive tape (for example, No. 188UL manufactured by Nitto Denko Co., Ltd.) formed by applying a silicone-based pressure-sensitive adhesive to glass cloth is wound 1/2 times twice. Is formed. The glass cloth adhesive tape has heat resistance and mechanical strength. The insulator layer 37 is formed so as to cover the trunk-side insulator 29 and the branch-side insulator 32 (about 10 to 20 mm) as indicated by dimensions B and B ′ in FIG. The insulator layer 37 is cured by heat.

  The branch connection portion 26 has an exterior protection portion 39 that covers and protects the coating removal portion 38 outside the conductor protection portion 35. The exterior protection part 39 includes a protective layer 40 that is one of the features of the present invention, and a resin mold 41 that is resin-molded on the outside of the protective layer 40.

  The protective layer 40 is formed by winding the glass-based tape and the refractory tape (two types of tapes, glass-based tape and refractory tape, are used instead of the conventional self-bonding tape). Specifically, it is formed to be a part of a three-layer structure in which a fireproof tape layer is sandwiched between glass tape layers.

  In this embodiment, as shown in FIG. 2 (b), the first protective layer 42 is formed by winding a glass-based tape (formed by wrapping a glass cloth adhesive tape twice twice), and The second protective layer 43 is formed by winding a fireproof tape (double-sided film mica tape is formed by wrapping twice twice), and the third protective layer 44 is formed by winding a glass-based tape (glass A cross adhesive tape is formed by wrapping 1/2 times twice.

  As shown by dimensions C and C ′ in FIG. 2B, the protective layer 40 is wound on the trunk line 23 and the branch line 25 (takes about 5 mm. In this embodiment, the total length of the protective layer 40 is 230 mm. It is formed so that it also winds.

  The protective layer 40 is also formed to function as a shaping layer for resin molding on the outside. The protective layer 40 is shaped to facilitate injection molding when the resin mold 41 is molded.

  In the above-described configuration and structure, the refractory layer 36 in the conductor protection portion 35 is formed by winding a refractory tape, so that it can protect from heat and flame. Moreover, since the insulator layer 37 in the conductor protection part 35 is formed by winding a glass-based tape, the glass-based tape is not melted by heat, and as a result, insulation can be reliably maintained. Since the insulator layer 37 formed of the glass-based tape is cured by heat, it can protect the inner side even under external pressure.

  Since the protective layer 40 in the exterior protection part 39 is composed of two types of tapes, that is, a fireproof tape and a glass-based tape, it can be protected from heat and flame as well as from external pressure. can do.

  As mentioned above, according to this invention, there exists an effect that deterioration of fireproof performance can be aimed at. The present invention has an effect that the fire resistance can be remarkably improved as compared with the prior art.

  It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention. In addition, the characteristic part of this invention shall be applicable also to the part which connects the terminals of a high voltage | pressure fireproof cable.

It is a block diagram which shows one Embodiment of the cable with a branch of this invention. It is a figure which shows typically the processing structure of a branch connection part, (a) is a figure of the processing structure of a conductor connection part, (b) is a figure of the processing structure of a coating | coated removal part (exterior protection part). It is a block diagram of the cable with a branch of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 21 Cable with branch 22 Trunk cable 23 Trunk line 24 Branch line cable 25 Branch line 26 Branch connection part 27 Trunk side conductor 28 Cable fireproof layer 29 Trunk side insulator 30 Branch side conductor 31 Cable fire resistant layer 32 Branch side insulator 33 Compression connector 34 Conductor connection portion 35 Conductor protection portion 36 Refractory layer 37 Insulator layer 38 Cover removal portion 39 Exterior protection portion 40 Protection layer 41 Resin mold 42 First layer protection layer 43 Second layer protection layer 44 Third layer protection layer

Claims (3)

After removing a part of each covering of the main line cable and the branch line cable and connecting the conductors, a conductor protection part having a fireproof layer and an insulator layer is formed outside the conductor connection part, and the conductor protection part In the cable with a branch formed by forming an exterior protection part that covers the coating removal part on the outside,
In the conductor protection part, the fireproof layer is formed by winding a fireproof tape, the insulator layer is formed by winding a glass tape, and the exterior protection part is formed by winding a glass tape and a fireproof tape. Branched cable characterized by having a protective layer. The branched cable according to claim 1,
The protective layer has a first layer formed by winding a glass-based tape, a second layer formed by winding a refractory tape, and a third layer formed by winding a glass-based tape. Cable with branching. In the cable with a branch according to claim 1 or claim 2,
The protective layer has a function as a shaping layer for resin molding on the outside. Cable with branches.

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