JP2022087415A - Fireproof cable and manufacturing method of fireproof cable - Google Patents

Abstract

To provide a fireproof cable capable of preventing a deterioration of fireproof performance even if a fireproof layer is damaged, and a manufacturing method of the fireproof cable.SOLUTION: A fireproof cable 1 includes: two fireproof wires 6 each including a conductor 2, a fireproof tape 3 wound around a circumference of the conductor 2 so that edge portions are overlapping each other, and an insulator 5 coating a circumference of the fireproof tape 3; and a sheath 9 disposed on an outside of each of the fireproof wires 6. The fireproof tape 3 includes a fireproof layer and a heat-resistant adhesive layer composed of an adhesive containing alumina and silica and configured to adhere and harden at a prescribed temperature.SELECTED DRAWING: Figure 1

Description

The present invention relates to a refractory cable including one or two or more refractory electric wires, and a method for manufacturing the refractory cable.

Conventionally, for example, a fire-resistant cable having improved fire resistance has been proposed for the purpose of maintaining power supply to a fire extinguishing system or the like for as long as possible in the event of a fire. The fireproof cable has the specified withstand voltage characteristics and insulation resistance characteristics when the temperature is raised to 840 ° C in 30 minutes according to the temperature curve of JIS C 1304 specified in the 1997 Fire and Disaster Management Agency Notification No. 10. Is required. As such a refractory cable, for example, the one disclosed in Patent Document 1 is known.

The refractory cable disclosed in Patent Document 1 is shown in FIGS. 6 and 7. The refractory cable 100 according to the prior art shown in FIGS. 6 and 7 includes two twisted refractory electric wires 101, inclusions 102 arranged on the outer periphery of the two refractory electric wires 101, and inclusions 102 and 2. It includes a presser-wrapping tape 103 wound around the outer periphery of the refractory electric wire 101 of the book, and a sheath 104 coated on the outer periphery of the presser-wrapping tape 103.

As shown in FIGS. 6 and 7, the refractory electric wire 101 is covered with the conductor 105, the refractory tape 106 overlapped (spiral wound so that the ends overlap) around the outer circumference of the conductor 105, and the outer circumference of the refractory tape 106. The insulator 107 and the like are provided.

As shown in FIG. 8, the refractory tape 106 includes a refractory layer 108 and a film 109 laminated on the refractory layer 108. The refractory layer 108 is a layer in which scales of mica, which is an inorganic substance, are arranged without gaps. The film 109 is, for example, a film made of polyethylene. As shown in FIG. 8, the refractory tape 106 is wound with the refractory layer 108 as the conductor 105 side. In the prior art, the refractory tape 106 is mainly wound around the outer periphery of the conductor 105, although it is not shown in particular, when the refractory performance is taken into consideration.

In the prior art, for example, when the refractory cable 100 burns due to a fire or the like, the sheath 104, the insulator 107, and the like are finally burned out, and the refractory layer 108 (see FIG. 8) remains. As described above, since the refractory layer 108 remains in the refractory cable 100, the electric performance can be temporarily functioned even in the event of a fire, and the power supply to the fire extinguishing equipment and the like can be maintained.

Japanese Unexamined Patent Publication No. 2019-169267

By the way, in the above-mentioned prior art, in order to make the electric performance of the refractory cable 100 function, it is necessary that the scales of the mica of the refractory layer 108 remain in a uniform state without breakage (cracking or chipping). This is because if the refractory layer 108 is damaged, the fire resistance performance may be deteriorated, the insulation performance may be deteriorated, and a conductive substance such as carbide may invade from the damaged portion. Is.

However, in the prior art, the refractory layer is as shown in FIG. 9 due to the application of an external force to the refractory cable 100 (for example, the refractory cable 100 is extremely bent when the refractory cable 100 is laid out). There was a risk that a crack 110 would occur in 108. Therefore, in the prior art, it is necessary to prevent the performance of the refractory cable 100 from deteriorating even if the refractory layer 108 is damaged such as a crack 110.

The present invention has been made in view of the above circumstances, and a fireproof cable in which the fireproof performance is not deteriorated even if the fireproof layer is damaged, and a method for manufacturing the fireproof cable. The challenge is to provide.

(1) The refractory cable of the present invention according to claim 1 made to solve the above problems includes a conductor, a refractory tape wound around the outer periphery of the conductor so that the ends overlap each other, and an outer circumference of the refractory tape. The refractory tape comprises one or more refractory wires comprising, and a sheath provided on the outside of the refractory wire, the refractory tape being laminated on the refractory layer and the refractory layer. Moreover, it is characterized by comprising a heat-resistant adhesive layer made of an adhesive material containing alumina and silica and adhering and curing at a constant temperature.

According to the present invention having the above-mentioned characteristics (1), since the heat-resistant adhesive layer is laminated on the fire-resistant layer, even if the fire-resistant layer is damaged such as cracks, a fire or the like may occur. A heat-resistant adhesive layer made of an adhesive that is adhesively cured by heat replaces the fire-resistant layer and supplements the damaged fire-resistant layer, so that the fire-resistant performance of the damaged fire-resistant layer is supplemented. Further, according to the present invention, the refractory performance of the damaged refractory layer is supplemented by the heat-resistant adhesive layer, so that even if the refractory layer is damaged, the insulation performance is ensured and the insulation performance is ensured. Invasion of conductive substances such as carbides from the damaged part to the conductor side is prevented.

(2) In the refractory cable of the present invention according to claim 2, the refractory adhesive layer is outside the refractory layer in a state where the refractory tape is wound around the outer periphery of the conductor in the refractory cable according to claim 1. It is characterized by being placed in.

According to the present invention having the above-mentioned characteristics (2), even if the refractory layer is damaged, the refractory adhesive layer is arranged outside the refractory layer, so that the refractory adhesive layer can be formed. Since the outer surface of the fire-resistant layer is covered to compensate for the damaged fire-resistant layer, the fire-resistant performance of the damaged fire-resistant layer is more reliably compensated. Further, according to the present invention, since the heat-resistant adhesive layer covers the outer surface of the fire-resistant layer to supplement the damaged fire-resistant layer, the insulation performance is more reliably ensured, and carbides and the like from the damaged portion to the conductor side are secured. Invasion of conductive substances is more reliably prevented.

(3) The refractory cable of the present invention according to claim 3 is the refractory cable according to claim 1 or 2, wherein the refractory tape is wound around the outer periphery of the conductor by vertical winding. do.

According to the present invention having the above-mentioned feature (3), since the refractory tape is wound by vertical winding, it is compared with the case where the refractory tape is wound around the outer periphery of the conductor by lap winding as in the prior art. Workability in the work of wrapping the refractory tape is improved.

(4) The refractory cable of the present invention according to claim 4 is the refractory cable according to claim 1, 2 or 3, wherein the portion where the ends of the refractory tape overlap each other is formed as an overlapping portion. The overlapped portion is characterized in that it is adhered with the adhesive material.

According to the present invention having the above-mentioned characteristics (4), the overlapped portion is adhered with an adhesive that is adhesively cured by heat such as a fire, so that the fire resistance is further improved and the overlapped portion is overlapped. The invasion of the conductive substance to the conductor side due to the opening of the portion is prevented.

(5) The refractory cable of the present invention according to claim 5 is the refractory cable according to claim 1, 2, 3 or 4, wherein the adhesive is adhesively cured when it reaches 100 ° C to 150 ° C. It is characterized by being.

According to the present invention having the above-mentioned characteristics (5), the adhesive material constituting the heat-resistant adhesive layer and used for adhering the overlapped portion is adhesively cured at 100 ° C to 150 ° C. For example, it is cured by applying a high temperature such as heat such as a fire. Here, when an insulator is formed on the outer periphery of the refractory tape by extrusion molding, the material of the insulator is extruded at a temperature of around 180 ° C. However, since it is cooled immediately after extrusion molding of the insulator, the refractory tape is used. The temperature is less than 100 ° C. As described above, the temperature applied to the refractory tape during extrusion molding of the insulator does not reach the temperature at which the adhesive is adhesively cured (100 ° C to 150 ° C). Therefore, according to the present invention, the adhesive is not cured by extrusion molding of the insulator.

(6) The refractory cable of the present invention according to claim 6 is the refractory cable according to claim 1, 2, 3, 4 or 5, wherein the refractory cable is wound around the outer periphery of the refractory tape at a predetermined pitch interval. It is characterized by being provided with a refractory thread.

According to the present invention having the characteristics as described in (6) above, since the opening of the refractory tape is more reliably suppressed by winding the refractory yarn at a predetermined pitch interval, the refractory tape is wound so as not to have a gap. Be done. As a result, the intrusion of the conductive substance into the conductor side due to the opening of the refractory tape is more reliably prevented.

(7) In the method for manufacturing a fireproof cable of the present invention according to claim 7, which has been made to solve the above problems, a fireproof tape is wound around the outer periphery of the conductor so that the ends overlap with each other, and the outer periphery of the fireproof tape is insulated. It includes a fireproof wire manufacturing step of manufacturing one or more fireproof wires by forming a body by extrusion molding, and a sheath forming step of forming a sheath on the outside of the fireproof wires by extrusion molding. In the fire-resistant electric wire manufacturing process, the fire-resistant tape includes a fire-resistant layer and a heat-resistant adhesive layer made of an adhesive material that is laminated on the fire-resistant layer and contains alumina and silica and is adhesively cured at a constant temperature. Is characterized by using.

According to the present invention having the characteristics as described in (7) above, since the heat-resistant adhesive layer is laminated on the refractory layer, even if the refractory layer is damaged such as a crack, a fire or the like may occur. A heat-resistant adhesive layer made of an adhesive that is adhesively cured by heat replaces the fire-resistant layer and supplements the damaged fire-resistant layer. Therefore, a fire-resistant cable that supplements the fire-resistant performance of the damaged fire-resistant layer is manufactured. Further, according to the present invention, the refractory performance of the damaged refractory layer is supplemented by the heat-resistant adhesive layer, so that even if the refractory layer is damaged, the insulation performance is ensured and the insulation performance is ensured. A refractory cable that prevents the intrusion of conductive substances such as carbides from the damaged part to the conductor side is manufactured.

According to the present invention, even if the refractory layer is damaged, the fire resistance performance of the refractory cable does not deteriorate.

It is a partially broken perspective view which shows the Example of the refractory cable which concerns on this invention. It is sectional drawing between A and A in FIG. 2 is an enlarged cross-sectional view of a portion indicated by an arrow B in FIG. 2. FIG. 3 is an enlarged cross-sectional view of a portion surrounded by a virtual line C in FIG. It is a partially broken perspective view which shows the refractory electric wire. It is a partially broken perspective view which shows the refractory cable which concerns on the prior art. It is sectional drawing between DD in FIG. FIG. 7 is an enlarged cross-sectional view of a portion indicated by an arrow E in FIG. 7. FIG. 5 is an enlarged cross-sectional view of a portion indicated by an arrow F in FIG. 7 in a state where a crack is generated in the refractory layer of the refractory tape in the prior art.

Hereinafter, examples of the refractory cable according to the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 is a partially cutaway perspective view showing an embodiment of a fireproof cable according to the present invention, FIG. 2 is a cross-sectional view between A and A in FIG. 1, and FIG. 3 is an enlarged cross-sectional view of a portion indicated by an arrow B in FIG. FIG. 4 is an enlarged cross-sectional view of a portion surrounded by the virtual line C in FIG. 3, and FIG. 5 is a partially broken perspective view showing a fireproof electric wire.

In FIGS. 1 and 2, reference numeral 1 indicates an embodiment of the refractory cable according to the present invention. The refractory cable 1 in this embodiment is a case of a multi-core refractory cable. The fireproof cable 1 includes a plurality of (two in this embodiment) fireproof electric wires 6 having a conductor 2, a fireproof tape 3, a fireproof thread 4, and an insulator 5, an inclusions 7, and a presser winding tape 8. And a sheath 9. The size of the refractory cable 1 is assumed to be 14 sq or more and 400 sq or less (the above size is an example). Hereinafter, each configuration of the refractory cable 1 will be described.

First, the refractory electric wire 6 will be described.
As described above, a plurality of refractory electric wires 6 shown in FIGS. 1 and 2 are provided. In the present embodiment, the refractory cable 1 is configured to include two refractory electric wires 6, but is not limited thereto. In addition, although detailed description and illustration are omitted, it may be configured to include one refractory electric wire 6. As described above, it is assumed that the refractory cable having one refractory electric wire 6 does not include the inclusions 7 and the presser winding tape 8. Further, although detailed description and illustration are omitted, it may be configured to include three or more refractory electric wires 6.

The refractory electric wire 6 illustrated in FIGS. 1 and 2 has a conductor 2, a refractory tape 3, a refractory thread 4, and an insulator 5, as described above. The conductor 2 shown in FIGS. 1 and 2 supplies a current, and in this embodiment, it is a single-core conductor having a circular cross section. The conductor is made of copper, a copper alloy, aluminum, an aluminum alloy, or the like.

The refractory tape 3 shown in FIGS. 1 and 2 is formed in a long strip shape. The refractory tape 3 is formed so that the width in the longitudinal direction of the refractory tape 3 can cover the longitudinal direction of the conductor 2, and the width in the lateral direction of the refractory tape 3 covers the outer periphery of the conductor 2. It is formed to the possible width.

The refractory tape 3 shown in FIGS. 1 and 2 is wound so that there is no gap on the outer periphery of the conductor 2. As shown in FIG. 3, in the refractory tape 3 so that one end 10 and the other end 11 of the refractory tape 3 in the lateral direction overlap with each other on the outer circumference of the conductor 2 (the ends of the refractory tape 3 overlap each other on the outer circumference of the conductor 2). Are wrapped around (so that they overlap).

Here, the one end 10 and the other end 11 of the refractory tape 3 in the lateral direction in this embodiment correspond to the "ends" described in the claims.

As shown in FIG. 4, the refractory tape 3 has films 15 and 16 sandwiching the refractory layer 13, the heat-resistant adhesive layer 14 laminated on the fire-resistant layer 13, the fire-resistant layer 13 and the heat-resistant adhesive layer 14 from the laminating direction. And have.

The refractory layer 13 shown in FIG. 4 is a layer having a fire resistance, and is a layer in which scales of mica, which is an inorganic substance, are arranged without gaps. Therefore, the refractory layer 13 may be referred to as a “mica layer”.

The heat-resistant adhesive layer 14 shown in FIG. 4 is arranged so as to cover one outer surface 18 of the fire-resistant layer 13. The heat-resistant adhesive layer 14 supplements the fire-resistant layer 13 when the fire-resistant layer 13 is damaged such as a crack due to an external force such as bending of the fire-resistant cable 1, and the damaged fire-resistant layer 13 It is provided as a layer to reinforce the fire resistance. Further, even if the refractory layer 13 is damaged, the heat-resistant adhesive layer 14 supplements the refractory layer 13 to ensure insulation performance, and also has conductivity such as carbides from the damaged portion to the conductor 2 side. It is also provided as a layer to prevent the intrusion of substances.

The heat-resistant adhesive layer 14 shown in FIG. 4 is a layer made of an adhesive material 17 having excellent heat-resistant performance. The adhesive 17 is a heat-resistant adhesive (thermosetting adhesive) that contains alumina (aluminum oxide) and silica as main components and is adhesively cured when a certain temperature is reached. The heat-resistant adhesive layer 14 may be referred to as a "thermosetting adhesive layer".

In this embodiment, the above-mentioned "constant temperature" at which the adhesive material 17 is adhesively cured is assumed to be 100 ° C to 150 ° C. By containing alumina and silica as main components, the adhesive material 17 starts adhesive curing at a high temperature as described above. The adhesive 17 having such properties is cured by applying a high temperature such as heat such as a fire. According to the heat-resistant adhesive layer 14 made of such an adhesive material 17, even if the fire-resistant layer 13 is damaged, the damaged portion can be supplemented and the characteristics of the fire-resistant cable 1 can be satisfied.

As will be described later, the adhesive material 17 is also used for adhering the superposition portion 12 (one end 10 and the other end 11 of the refractory tape 3 in the lateral direction) (see FIG. 3).

Here, when the insulator 5 is formed on the outer periphery of the fireproof tape 3 by extrusion molding, the material (resin material) of the insulator 5 is extruded at a temperature of around 180 ° C. Since it is cooled immediately afterwards, the temperature applied to the fireproof tape 3 is less than 100 ° C. Therefore, the temperature applied to the fireproof tape 3 during extrusion molding of the insulator 5 does not reach the temperature (100 ° C to 150 ° C) at which the adhesive material 17 is adhesively cured. Therefore, the adhesive material by extrusion molding of the insulator 5 is used. No cure of 17 occurs.

The films 15 and 16 shown in FIG. 4 are, for example, films made of polyethylene. The films 15 and 16 may contain powdered mica (powdered mica) in order to impart fire resistance. The film 15 may be referred to as a "first film" and the film 16 may be referred to as a "second film".

The refractory tape 3 is wound around the outer circumference of the conductor 2 by a so-called “vertical winding”. Here, "vertical winding" means that one end 10 and the other end 11 of the refractory tape 3 in the lateral direction are formed on the outer periphery of the conductor 2 in a state where the longitudinal direction of the refractory tape 3 is aligned with the longitudinal direction of the conductor 2. It is a winding method that winds so that they overlap.

The portion where one end 10 and the other end 11 of the refractory tape 3 shown in FIG. 3 in the lateral direction overlap each other is formed as a superposition portion 12. The superposition portion 12 is adhered with the adhesive material 17 (see FIG. 3).

When the refractory tape 3 is wound around the outer periphery of the conductor 2, as shown in FIG. 4, the refractory adhesive layer 14 is wound so as to be arranged outside the refractory layer 13 when viewed from the conductor 2.

The refractory thread 4 shown in FIGS. 1 and 5 is a thread having a fire-resistant performance that is wound around the outer periphery of the refractory tape 3 in order to prevent the overlapping portion 12 of the refractory tape 3 from opening. The refractory yarn 4 is, for example, a yarn such as glass yarn (manufactured by Unitika Ltd.) that is difficult to burn (may be other inorganic fibers).

As shown in FIG. 5, the refractory yarn 4 is such that the refractory tape 3 is wound around the outer circumference of the conductor 2 by vertical winding, and then spirally wound around the outer circumference of the refractory tape 3 at a predetermined pitch interval P. do. The above "predetermined pitch interval P" is assumed to be 3 mm or more and 6 mm or less in this embodiment.

The insulator 5 shown in FIGS. 1 and 2 is formed to have a predetermined thickness by extruding a resin material used for a general refractory cable to the outer periphery of the refractory tape 3 as well. Examples of the resin material include polyolefin-based resins and vinyl chloride-based resins.

Examples of the polyolefin resin include polyethylene (PE), polypropylene (PP), ethylene vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EEA), ethylene-α-olefin copolymer, and ethylene propylene copolymer. Coalescence and the like can be mentioned. Further, examples of the vinyl chloride resin include vinyl chloride resin.

Next, inclusions 7 will be described.
The inclusions 7 shown in FIGS. 1 and 2 exist between the two refractory electric wires 6. The inclusions 7 are provided between the refractory electric wires 6 when the two refractory electric wires 6 are twisted together so that the refractory cable 1 has a circular cross section. As the material of the inclusions 7, for example, paper, jute, PP defibrated yarn and the like are adopted.

Next, the presser winding tape 8 will be described.
The presser foot tape 8 shown in FIGS. 1 and 2 is formed by filling an inclusion 7 between the refractory electric wires 6 obtained by twisting two refractory electric wires 6 and winding them from above. As the presser winding tape 8, for example, polyester non-woven fabric, nylon non-woven fabric, polypropylene tape, polyester tape, glass tape, paper tape, ceramic paper and the like are adopted.

Next, the sheath 9 will be described.
The sheath 9 shown in FIGS. 1 and 2 is formed to have a predetermined thickness by extruding a resin material used for a general refractory cable onto the outer periphery of the presser winding tape 8. Since the resin material is the same as that of the insulator 5, detailed description thereof will be omitted.

It should be noted that the polyolefin-based resin can be used alone or in combination of two or more. For example, by using polyethylene, which has better mechanical properties than EEA and EVA but cannot be added with a large amount of flame retardant, and EEA and EVA, which can be added with a large amount of flame retardant, in combination with mechanical characteristics and difficulty. It is possible to construct a material with good acceptance of flame retardants.

Next, a method for manufacturing the refractory cable 1 according to the present invention will be described.
The manufacturing method of the fireproof cable 1 is a "fireproof wire manufacturing process" which is a process of manufacturing a fireproof wire 6 and a "fireproof wire twisting process" which is a process of twisting a plurality of fireproof wire 6s. The "presser winding tape winding step", which is a step of winding the presser winding tape 8 from above a plurality of fireproof electric wires 6, and the "sheath forming step", which is a step of forming a sheath 9 on the outer periphery of the presser winding tape 8. Includes. Hereinafter, each step of the method for manufacturing the refractory cable 1 will be described.

First, the refractory electric wire manufacturing process will be described.
In the process of manufacturing a refractory electric wire, first, the refractory tape 3 is wound around the outer circumference of the conductor 2 by vertical winding so that one end 10 and the other end 11 of the refractory tape 3 overlap each other (see FIG. 3). Here, when the refractory tape 3 is wound around the outer periphery of the conductor 2, the heat-resistant adhesive layer 14 is wound so as to be arranged on the outside of the refractory layer 13 when viewed from the conductor 2 (see FIG. 4).

After that, the superposed portion 12 in which one end 10 and the other end 11 of the refractory tape 3 in the lateral direction overlap each other is adhered with an adhesive 17 (see FIG. 3). After that, the refractory yarn 4 is spirally wound around the outer circumference of the refractory tape 3 at a predetermined pitch interval P (3 mm or more and 6 mm or less) (see FIG. 5).

After that, the insulator 5 is formed by extruding the resin material onto the outer periphery of the refractory tape 3 (see FIGS. 1 and 2).

Immediately after the insulator 5 is extruded, the insulator 5 is cooled by immersing the refractory electric wire 6 in cooling water or the like. When the insulator 5 is extruded, the material (resin material) of the insulator 5 is extruded at a temperature of around 180 ° C. However, as described above, since it is cooled immediately after the extrusion molding, the temperature applied to the fireproof tape 3 is 100. It is less than ° C. Therefore, the heat-resistant adhesive layer 14 (see FIG. 4) and the adhesive 17 (see FIG. 3) in the superposition portion 12 are not cured by extrusion molding of the insulator 5. This completes the production of the refractory electric wire 6.

Next, the refractory electric wire twisting process will be described.
In the refractory electric wire twisting step, a plurality of refractory electric wires 6 (two in this embodiment) are twisted. In this step, at the time of twisting, an inclusion 7 is attached between each refractory electric wire 6 so that the refractory cable 1 has a circular cross section (see FIGS. 1 and 2).

Next, the presser winding tape winding process will be described.
In the presser winding tape winding step, the presser winding tape 8 is wound from above the two twisted refractory electric wires 6 (see FIGS. 1 and 2).

Next, the sheath forming process will be described.
In the sheath forming step, the sheath 9 is formed by extruding the resin material onto the outer periphery of the presser winding tape 8 (see FIGS. 1 and 2). Immediately after extrusion molding of the sheath 9, the refractory cable 1 is immersed in cooling water to cool the sheath 9. This completes the production of the refractory cable 1.

According to the above embodiment, since the heat-resistant adhesive layer 14 is laminated on the fire-resistant layer 13, even if the fire-resistant layer 13 is damaged such as cracks, the adhesive is cured by the heat of a fire or the like. Since the heat-resistant adhesive layer 14 made of the adhesive material 17 replaces the fire-resistant layer 13 and supplements the damaged fire-resistant layer 13, the fire-resistant performance of the damaged fire-resistant layer 13 is supplemented. Further, according to this embodiment, the fire resistance of the damaged fire resistant layer 13 is supplemented by the heat resistant adhesive layer 14, so that the insulating performance is ensured even when the fire resistant layer 13 is damaged. At the same time, the invasion of conductive substances such as carbides from the damaged portion to the conductor 2 side is prevented.

Further, according to this embodiment, even if the refractory layer 13 is damaged, the heat-resistant adhesive layer 14 is arranged outside the refractory layer 13 when viewed from the conductor 2, so that the heat-resistant adhesive layer is formed. Since the 14 covers the outer surface 18 of the refractory layer 13 to compensate for the damaged refractory layer 13, the fire resistance performance of the damaged refractory layer 13 is more reliably compensated. Further, according to the present embodiment, since the heat-resistant adhesive layer 14 covers the outer surface 18 of the fire-resistant layer 13 to supplement the damaged fire-resistant layer 13, the insulation performance is more reliably secured, and the conductor from the damaged portion. Invasion of conductive substances such as carbides to the 2 side is more reliably prevented.

Further, according to the present embodiment, since the refractory tape 3 is wound by vertical winding, the refractory tape 106 is laminated on the outer periphery of the conductor 105 like the refractory cable 100 according to the prior art shown in FIG. The workability in the winding work of the refractory tape 3 is improved as compared with the case of winding by winding.

Further, according to the present embodiment, the overlapping portion 12 is adhered by the adhesive material 17 which is adhesively cured by the heat of a fire or the like, so that the fire resistance performance is further improved and the overlapping portion 12 is opened. The invasion of the conductive substance to the conductor 2 side is prevented.

Further, according to this embodiment, the adhesive material 17 constituting the heat-resistant adhesive layer 14 and used for adhering the overlapped portion 12 is adhesively cured at 100 ° C to 150 ° C. Therefore, for example, a fire. It cures when a high temperature such as heat is applied. Here, when the insulator 5 is formed on the outer periphery of the fireproof tape 3 by extrusion molding, the material of the insulator 5 is extruded at a temperature of around 180 ° C., but the insulator 5 is cooled immediately after the extrusion molding. Therefore, the temperature applied to the fireproof tape 3 is less than 100 ° C. As described above, the temperature applied to the refractory tape 3 during extrusion molding of the insulator 5 does not reach the temperature (100 ° C to 150 ° C) at which the adhesive material 17 is adhesively cured. Therefore, according to this embodiment, the adhesive 17 is not cured by extrusion molding of the insulator 5.

Further, according to the present embodiment, the refractory tape 3 has no gap because the opening of the refractory tape 3 (superposition portion 12) is more reliably suppressed by winding the refractory yarn 4 at a predetermined pitch interval P. Wrapped like this. As a result, the invasion of the conductive substance into the conductor 2 side due to the opening of the refractory tape 3 (superposition portion 12) is more reliably prevented.

Next, the effect of this embodiment will be described.
As described above with reference to FIGS. 1 to 5, according to this embodiment, even if the refractory layer 13 is damaged, the refractory performance of the refractory cable 1 is deteriorated. It has the effect of not having.

Next, features other than those described in the claims will be described.
The present invention described in the claims is characterized as a refractory cable 1 and a method for manufacturing the refractory cable 1, which is the invention of the refractory electric wire 6 and the method for manufacturing the refractory electric wire 6. The invention can be rewritten as described in (1) to (11) below.

(1) The refractory electric wire 6 covers the conductor 2, the refractory tape 3 wound around the outer periphery of the conductor 2 so that the ends (one end 10 and the other end 11) overlap each other, and the outer periphery of the refractory tape 3. Insulator 5 and
The refractory tape 3 includes a refractory layer 13 and a heat-resistant adhesive layer 14 made of an adhesive 17 laminated on the refractory layer 13 and containing alumina and silica and adhesively cured at a constant temperature. " It is a feature.

(2) The refractory electric wire 6 is described as follows: "In the refractory electric wire 6 described in (1) above, the refractory adhesive layer 14 is outside the refractory layer 13 in a state where the refractory tape 3 is wound around the outer periphery of the conductor 2. It is characterized by being placed in.

(3) The refractory electric wire 6 is characterized in that "in the refractory electric wire 6 according to (1) or (2) above, the refractory tape 3 is wound around the outer periphery of the conductor 2 by vertical winding." And.

(4) The refractory electric wire 6 is a portion in which the ends (one end 10 and the other end 11) of the refractory tape 3 overlap each other in the refractory electric wire 6 according to the above (1), (2) or (3). Is formed as a superimposing portion 12, and the superimposing portion 12 is adhered by the adhesive material 17. ”.

(5) The refractory electric wire 6 is described as "in the refractory electric wire 6 according to (1), (2), (3) or (4) above, the adhesive is adhesively cured when it reaches 100 ° C to 150 ° C. It is characterized by "to do".

(6) The refractory electric wire 6 is described in "In the refractory electric wire 6 according to (1), (2), (3), (4) or (5) above, the refractory electric wire 6 is attached to the outer periphery of the refractory tape 3. It is provided with a refractory yarn 4 wound at a predetermined pitch interval P. "

(7) The method for manufacturing the refractory electric wire 6 includes a step of winding the refractory tape 3 so that the ends (one end 10 and the other end 11) overlap with each other on the outer periphery of the conductor 2.
An insulator forming step of forming an insulator 5 on the outer periphery of the refractory tape 3 by extrusion molding,
Including
As the refractory tape 3, a refractory layer 13 and a heat-resistant adhesive layer 14 made of an adhesive 17 laminated on the refractory layer 13 and containing alumina and silica and adhesively cured at a constant temperature are used. It is characterized by that.

(8) The method for manufacturing the refractory electric wire 6 is as follows: "In the method for manufacturing the refractory electric wire 6 according to (7) above, in the refractory tape winding step, when the refractory tape 3 is wound around the outer periphery of the conductor 2, the refractory is heat resistant. The adhesive layer 14 is wound so as to be arranged on the outside of the refractory layer 13. "

(9) The method for manufacturing the refractory electric wire 6 is as follows: "In the method for manufacturing the refractory electric wire 6 according to (7) or (8) above, in the refractory tape winding step, the refractory tape 3 is vertically attached to the outer periphery of the conductor 2. It is characterized by "wrapping with a side roll".

(10) The method for manufacturing the refractory electric wire 6 is as follows: "In the method for manufacturing the refractory electric wire 6 according to (7), (8) or (9) above, in the refractory tape winding step, the end portion of the refractory tape 3 is used. The overlapping portion 12 is formed by superimposing each other (one end 10 and the other end 11), and the overlapping portion 12 is adhered by the adhesive material 17.

(11) The method for manufacturing the refractory electric wire 6 is as follows: "In the method for manufacturing the refractory electric wire 6 according to (7), (8), (9) or (10) above, the refractory thread 4 is attached to the outer periphery of the refractory tape 3. It further includes a refractory thread winding step of winding at a predetermined pitch interval P. "

The effects of the refractory electric wire 6 according to the above (1) to (6) and the effect of the method for manufacturing the refractory electric wire 6 according to (7) to (11) will be described.
That is, according to the method for manufacturing the refractory electric wire 6 according to the above (1) to (6) and the refractory electric wire 6 according to the above (7) to (11), the refractory layer 13 is damaged. Even in this case, the effect is that the refractory performance of the refractory electric wire 6 does not deteriorate.

In addition, it goes without saying that the present invention can be modified in various ways without changing the gist of the present invention.

1 ... Fireproof cable, 2 ... Conductor, 3 ... Fireproof tape, 4 ... Fireproof thread, 5 ... Insulator, 6 ... Fireproof wire, 7 ... Inclusion, 8 ... Presser winding tape, 9 ... Sheath, 10 ... One end (end) ), 11 ... The other end (end), 12 ... Overlapping part, 13 ... Fireproof layer, 14 ... Heat resistant adhesive layer, 15, 16 ... Film, 17 ... Adhesive, 18 ... Outer surface, P ... Pitch spacing

Claims (7)

One or more refractory wires comprising a conductor, a refractory tape wrapped around the outer circumference of the conductor so that the ends overlap each other, and an insulator coated on the outer circumference of the refractory tape.
A sheath provided on the outside of the refractory electric wire and
Equipped with
The refractory tape is a refractory cable comprising a refractory layer and a heat-resistant adhesive layer laminated on the refractory layer and made of an adhesive containing alumina and silica and adhering and curing at a constant temperature. In the refractory cable according to claim 1,
A refractory cable, wherein the refractory adhesive layer is arranged outside the refractory layer in a state where the refractory tape is wound around the outer periphery of the conductor. In the refractory cable according to claim 1 or 2.
The refractory tape is a refractory cable characterized in that it is wound around the outer periphery of the conductor by vertical winding. In the refractory cable according to claim 1, 2 or 3.
The portion where the ends of the refractory tape overlap each other is formed as a superposition portion.
The laminated portion is a refractory cable characterized in that it is adhered with the adhesive material. In the refractory cable according to claim 1, 2, 3 or 4.
A refractory cable characterized in that the adhesive material is adhesively cured when it reaches 100 ° C to 150 ° C. In the refractory cable according to claim 1, 2, 3, 4 or 5.
The refractory cable is a refractory cable comprising a refractory thread wound around the outer circumference of the refractory tape at predetermined pitch intervals. A refractory electric wire manufacturing process for manufacturing one or more refractory electric wires by wrapping a refractory tape around the outer periphery of the conductor so that the ends overlap each other and forming an insulator on the outer periphery of the fireproof tape by extrusion molding. ,
A sheath forming step of forming a sheath on the outside of the refractory electric wire by extrusion molding,
Including
In the refractory electric wire manufacturing process, the refractory tape includes a refractory layer and a heat-resistant adhesive layer laminated on the refractory layer and made of an adhesive material containing alumina and silica and adhering and curing at a constant temperature. A method for manufacturing a refractory cable, which comprises using.

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