JP3148079B2 - High pressure fire resistant cable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure fire-resistant cable excellent in heat insulation and heat resistance and capable of reducing the diameter.

[0002]

2. Description of the Related Art Generally, a fire-resistant cable is used for electric wiring of fire-fighting emergency equipment, and is a cable for operating a fire-extinguishing equipment and an evacuation guidance display device for a certain time even during a fire. Also, depending on the operating voltage, 600V
Low voltage for compatible equipment power supply and 3300V or 660
There are two types for high voltage used for the emergency power supply main line corresponding to 0V. As shown in FIG. 5, a conventional high-pressure fire-resistant cable 1 has a fire-resistant layer 3, an insulator 4, a semiconductive tape 5, a shielding tape 6, a flame-retardant tape 7, and a foamable material. It is composed of a flame retardant tape 8, a holding tape 9, and a sheath layer 10. The refractory layer 3 is formed by winding 6 to 14 pieces of mica composite tape, which is an inorganic insulator obtained by laminating a soft laminated mica and a glass cloth or a soft laminated mica and a film, and wrapping them with 1/2 to 1/10 wrap. It is formed to have a diameter of 1.3 to 1.5 mm or less. The insulator 4 is formed by extruding cross-linked polyethylene (XLPE), and the shielding tape 6 is formed from a metal material.

[0003] Further, as shown in FIG.
A tape obtained by applying, impregnating, or paper-making a fiber 12 such as pulp containing a metal hydrate to a polypropylene film (PP film), a polyethylene film (PE film), or a polyethylene terephthalate film (PET film) 11 is used. Alternatively, as shown in FIG.
A polyolefin resin 14 containing a metal hydrate is applied to the
Impregnated or paper-made tapes are used. Also,
As shown in FIG. 8, the foamable flame-retardant tape 8 comprises an ethylene-vinyl acetate copolymer as a binder, ammonium phosphate,
It is formed by applying a mixed composition 18 containing a foaming layer forming agent such as saccharose and a nitroso compound and a carbonized layer forming agent to the canvas 13. The flame retardant tape 7 or the foamable flame retardant tape 8 is usually wound 2 to 5 times. Further, the sheath layer 10 is made of polyvinyl chloride (PV).
It is formed by extruding a polyolefin resin containing C) and an inorganic flame retardant.

[0004]

Incidentally, the flame-retardant tape 7 is usually about 0.1 to 0.5 mm thick. Need to turn. Therefore, there is a problem that not only the material cost is increased but also the number of manufacturing steps is increased. Further, the foamable flame-retardant tape 8 usually has a thickness of about 1.0 to 2.0 mm,
In order to provide heat insulation and heat resistance, it is necessary to wind two or three sheets, although the number is smaller than that of the flame retardant tape 7, and there is a problem that the material cost and the number of manufacturing steps increase. In addition, the foamable flame-retardant tape 8 has a problem that the cable outer diameter is increased by 20 to 30% as compared with the flame-retardant tape 7, and it is difficult to handle during manufacturing or construction.

An object of the present invention has been made in view of the above-mentioned problems, and a high-pressure fire-resistant cable capable of securing good heat insulating properties and heat resistance even with a small number of turns and capable of reducing the diameter. Is to provide.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide a high-pressure fire-resistant cable in which a fire-resistant layer, a metallic shielding tape, a ceramic tape and a sheath layer are sequentially provided on a conductor from the inside. This can be achieved by a high-pressure fire-resistant cable, characterized in that the tape is constituted by a tape containing at least ceramic fiber and cellulose and an aluminum tape provided outside the tape.

Another object of the present invention is to provide a high-pressure fire-resistant cable in which a fire-resistant layer, a metallic shielding tape, a ceramic tape and a sheath layer are sequentially provided from the inside on a conductor, wherein the ceramic tape is at least This can be achieved by a high-pressure fire-resistant cable, which is constituted by a tape containing ceramic fibers and cellulose and PE films provided on both sides thereof.

The object of the present invention is to provide a ceramic tape having at least 100 parts by weight of a ceramic fiber and a melting point of 80%.
10 to 20 parts by weight of glass fiber at 0 ° C. and melting point of 600
The high-pressure fire-resistant cable is characterized by comprising 5 to 10 parts by weight of glass fiber at a temperature of 5 ° C. and 2 to 3 parts by weight of a cellulosic binder.

[0009]

In the high-pressure fire resistant cable having the above-mentioned structure according to the present invention, a tape containing at least ceramic fiber and cellulose and a ceramic tape composed of an aluminum tape provided on the outside thereof or a PE film provided on both surfaces are provided. It is wound. Therefore, the heat insulating property and the heat resistance are improved, and the mechanical strength is improved, so that one winding has a sufficient effect, and the diameter can be reduced as compared with the conventional case.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a high-pressure fireproof cable according to the present invention will be described below in detail with reference to FIGS. FIG.
FIG. 2 is a sectional view showing a high-pressure fire-resistant cable according to the present invention.
FIG. 3 is a sectional view showing a first embodiment of a ceramic tape, and FIG.
FIG. 4 is a sectional view showing a second embodiment of the ceramic tape, and FIG.
FIG. 6 is a sectional view showing a third embodiment of the ceramic tape. In the figures, the composition of the ceramic tape is shown.
○ and □, glass fiber to emphasize the glass fiber
In addition to the description of the black binder, the same parts as those described above are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 1, a high-pressure fire-resistant cable 20 according to the present embodiment includes a fire-resistant layer 3, an insulator 4, a semiconductive tape 5,
It comprises a shielding tape 6, a ceramic tape 21, a holding tape 9, and a sheath layer 10. Among them, the conductor 2, the refractory layer 3, the insulator 4, the semiconductive tape 5, the holding tape 9, and the sheath layer 10 are the same as the configuration of the high-pressure refractory cable 1 shown in FIG.

[0011] As shown in FIG.
Is a mixed composition 31 comprising at least a ceramic fiber 24, two types of glass fibers 25 and 26 having different melting points, and a cellulosic binder 27 between an outermost aluminum tape 22 and an innermost PE film 23. Is sandwiched between them. This ceramic fiber 24 is made of, for example, Si
O ₂ and Al ₂ O ₃ are used, and the melting point is 1400 ° C.
It has been studied to disperse the ceramic fiber 24 in water and make it into a sheet by a method similar to papermaking, that is, a method for producing paper. It is difficult to form a sheet using only fibers.

Therefore, the ceramic tape 2 of the present invention
1, the binder 27 of cellulosic to have a tangle added 2-3 parts by weight, more glass fibers 25 having a melting point of 800 ° C.
And a glass fiber 26 having a melting point of 600 ° C. are added so that the strength does not decrease even after the cellulose binder 27 is thermally decomposed. The mixing ratio of each component of the ceramic tape 21 in this embodiment is such that the ceramic fiber 24 is 100 parts by weight, the glass fiber 25 having a melting point of 800 ° C. is 10 to 20 parts by weight, and the glass fiber 26 having a melting point of 600 ° C. is 5 to 5 parts by weight. 10 parts by weight, and 2 to 3 parts by weight of the cellulosic binder 27 . Various mixing ratios of each component can be selected according to the purpose and use.

The ceramic tape 21 is wound so that the aluminum tape 22 is on the outside. As a result, even if the high-pressure fire-resistant cable 20 is exposed to a high temperature due to a fire or the like, the heat is blocked and reflected by the aluminum tape 22, and the high fire-resistance performance is maintained in combination with the ceramic fiber and glass fiber underneath. In the state where the high-pressure fireproof cable 20 is laid, a strong side pressure may be applied to the stopper,
Even after other components are burned by the presence of the aluminum tape 22, the aluminum tape 22 serves as an external protective layer. Further, the tape made of only glass fiber has a low mechanical strength and has to have a sandwich structure of a plastic film. However, the ceramic tape 21 of the present embodiment has sufficient mechanical strength because it contains ceramic fiber. In addition, since taping can be performed at a high speed, productivity can be significantly improved.

The high-pressure fire-resistant cable 20 is provided by the Fire Department Notification 7
As a result of the test according to the method specified in the above, the sheath layer 10 has heat resistance (shape retention) even after burning, prevents the insulator 4 from melting due to a heat insulating effect, and has an insulation resistance value and a withstand voltage value. Improved and passed the regulations. Furthermore, 0.2
Sufficient heat insulation and heat resistance can be obtained simply by winding a single ceramic tape 21 of 5 to 1.5 mm, so that the diameter of the high-pressure fire-resistant cable 20 can be reduced. by this,
Since the handling is facilitated, the productivity is improved and the cost is reduced, and the coating portion can be easily peeled and the workability can be improved.

The ceramic tape 2 of the first embodiment described above.
1 has a structure in which ceramic fibers 24 and the like are sandwiched between an aluminum tape 22 and a PE film 23. As shown in FIG. 3, a ceramic tape 28 in which the PE film 23 is omitted is used as a second embodiment. Can also. As shown in FIG. 4, as a third embodiment, a ceramic tape 29 in which ceramic films 24 and the like are sandwiched between PE films 23 disposed above and below can be used. These ceramic tapes 28 and 29 can also improve the heat insulation and heat resistance of the high-pressure fire-resistant cable 20 and can be reduced in diameter, similarly to the ceramic tape 21 described above.

[0016]

As described above, in the high-pressure fire-resistant cable of the present invention, a ceramic fiber, a glass fiber, and a cellulose tape are sandwiched between an aluminum tape and a PE film, or a ceramic tape sandwiched between PE films is used. Things. Therefore, in this high-pressure fire-resistant cable, the mechanical strength is improved by the ceramic fiber, and the heat insulation and heat resistance are improved. Furthermore, since winding only one ceramic tape has a sufficient effect, the diameter of the high-pressure fire-resistant cable can be reduced. Therefore, the handling is facilitated, so that the productivity is improved, the manufacturing cost is reduced, and the peeling of the covering portion is facilitated, so that the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a high-pressure fire-resistant cable according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of the ceramic tape shown in FIG. 1;

FIG. 3 is a sectional view showing a second embodiment of the ceramic tape shown in FIG. 1;

FIG. 4 is a sectional view showing a third embodiment of the ceramic tape in FIG. 1;

FIG. 5 is a sectional view of a conventional high-pressure fire-resistant cable.

FIG. 6 is a sectional view showing an example of a conventional flame-retardant tape.

FIG. 7 is a sectional view showing another example of a conventional flame retardant tape.

FIG. 8 is a cross-sectional view showing a conventional foamable flame-retardant tape.

[Explanation of symbols]

 Reference Signs List 2 conductor 3 fireproof layer 4 insulator 5 semiconductive tape 6 shielding tape 10 sheath layer 20 high-pressure fireproof cable 21,28,29 ceramic tape 22 aluminum tape 23 PE film 24 ceramic fiber 25,26 glass fiber 27 cellulose binder

Claims (3)

(57) [Claims] 1. A high-pressure fire-resistant cable in which a refractory layer, a metallic shielding tape, a ceramic tape and a sheath layer are sequentially provided from the inside on a conductor, wherein the ceramic tape contains at least ceramic fibers and cellulose. A high-pressure fire-resistant cable comprising a tape and an aluminum tape provided outside the tape. 2. A high-pressure fire-resistant cable in which a refractory layer, a metallic shielding tape, a ceramic tape and a sheath layer are sequentially provided from the inside on a conductor, wherein the ceramic tape contains at least ceramic fibers and cellulose. A high-pressure fire-resistant cable comprising a tape and polyethylene films provided on both sides thereof. 3. The ceramic tape comprises at least 100 parts by weight of ceramic fiber, 10 to 20 parts by weight of glass fiber having a melting point of 800 ° C., and 5 to 10 parts by weight of glass fiber having a melting point of 600 ° C. Cellulose binder 2
The high-pressure fire-resistant cable according to claim 1 or 2, wherein the high-pressure fire-resistant cable is constituted by up to 3 parts by weight.