JP2007174849A - Double heat insulation cable box - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation cable box for protecting various cables, e.g. information transmission cables such as communication cable and optical fiber cable and power cables, effectively against external factors such as fire. <P>SOLUTION: A heat insulation air layer 12 is formed on the inside of a metal pipe 11 as an outer pipe, a heat insulation material layer 13 is formed on the inside of the heat insulation air layer 12, and a space 14 for containing cables is provided in the heat insulation material layer 13. The heat insulation material layer 13 is formed by sticking rock wool, ceramic fibers, or the like, molded planarly to the inside of a second metal pipe 15. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a double heat insulation cable box having a storage space inside which accommodates a wiring cable installed indoors and outdoors.
More specifically, the present invention relates to a double insulated cable box used for laying information transmission cables such as telephone lines and optical fiber cables and power cables.

Conventionally, as a cable box used for laying an information transmission cable such as a communication cable and an optical fiber cable, a power cable, and the like, the one described in Japanese Patent Laid-Open No. 2004-23906 (Patent Document 1) by the present inventor is known. ing.
In this Patent Document 1, a metal heat sink is arranged in a lateral direction inside a square metal tube body, and the inside of the metal tube body is divided, and the square shape is placed in the divided compartment. The cable box is characterized in that the synthetic resin pipes are stacked one above the other and stored, and the heat radiating plate is positioned on the bottom side of the synthetic resin pipe that houses the power cable.
The cable box described in Patent Document 1 is effective against internal factors such as an abnormally high temperature of the cable itself.
Japanese Patent Laid-Open No. 2004-23906

  However, the cable box described in Patent Document 1, for example, does not consider the response to a fire that has occurred indoors, and is not necessarily effective for external factors.

  Therefore, there has been a demand for a cable box for effectively protecting the cable from external factors such as a fire.

First,
A double heat insulation cable box having a heat insulation air layer and a heat insulation material layer inside a metal pipe body as an outer tube body, and further having a cable storage space inside.
Second,
A double-ply characterized in that a heat insulating air layer is formed inside a metal pipe body as an outer pipe body, a heat insulating material layer is formed inside the heat insulating air layer, and a cable housing space is further provided inside. Insulated cable box.
Third,
A double layer characterized in that a heat insulating material layer is formed inside a metal tube body as an outer tube body, a heat insulating air layer is formed inside the heat insulating material layer, and a cable storage space is further provided inside. Insulated cable box.

  The terminology will be explained below.

  The outer tubular body is a tubular body constituting the double insulated cable box according to the present invention and is located on the outermost side, and is preferably made of metal.

  In addition to rock wool, the heat insulating material layer can be formed, for example, by pasting ceramic fiber molded into a plate shape without any gaps, but is not limited thereto. For example, it can be formed by injecting a heat insulating foam between two plates.

  The adiabatic air layer can be formed, for example, by using a large and small tube body having different diameters and combining them using a spacing member so as to maintain a constant spacing as an air layer between the outer tube and the inner tube.

  The outer tubular body constituting the double insulated cable box may employ a vertically divided structure including a U-shaped receiving member and a lid member combined with the receiving member.

  Inside the double insulated cable box, there is a storage space for storing various cables such as communication cables, information transmission cables such as optical fiber cables, and power cables.

  According to the present invention, since the double heat insulating structure of the heat insulating material layer and the heat insulating air layer is provided, the cable can be effectively protected from external factors such as a fire.

  Particularly, a heat insulating effect is more excellent when a heat insulating air layer is formed inside a metal pipe body and a heat insulating material layer is formed inside the heat insulating air layer.

It is a front view of the double insulated cable box of the outside insulated air type of the first embodiment of the double insulated cable box of the present invention. It is a front view of the double heat insulation cable type of the outer side heat insulation material type of 2nd Embodiment of the double heat insulation cable box of this invention. It is a graph which shows the test result concerning the double insulation cable box using rock wool. It is a graph which shows the test result which concerns on the double heat insulation cable box using a ceramic fiber.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Metal pipe body 12 Heat insulation air layer 13 Heat insulation material layer 14 Storage space 15 2nd metal pipe body 22 Heat insulation material layer 23 Heat insulation air layer 24 Storage space 25 2nd metal pipe body 26 3rd metal pipe body

  Hereinafter, embodiments of the double insulated cable box of the present invention will be described with reference to the drawings.

  An outer insulated air type double insulated cable box of the first embodiment of the double insulated cable box of the present invention will be described with reference to FIG.

  In the double insulated cable box of the outer insulated air type of the first embodiment, a heat insulating air layer 12 is formed inside a metal tube 11 as an outer tube body, and a heat insulating material layer 13 is formed inside the heat insulating air layer 12. The cable housing space 14 is provided inside the heat insulating material layer 13.

  Here, the insulated air layer 12 is a tubular body constituting a double insulated cable box, and is a metal tubular body 11 located on the outermost side, and a second metallic tube having a diameter smaller than that of the metallic tubular body 11. A spacing member (not shown) is used to hold the body 15 as an air layer between the metal tube 11 serving as the outer tube and the second metal tube 15 serving as the inner tube. ) Are used in combination.

  The heat insulating material layer 13 is formed by sticking rock wool molded into a plate shape inside the second metal tube 15.

  The storage space 14 is present in the double insulated cable box in order to store various cables such as a communication cable, an information transmission cable such as an optical fiber cable, and a power cable.

  Next, with reference to FIG. 2, a double insulated cable box of the outer heat insulating material type of the second embodiment of the double insulated cable box of the present invention will be described.

  In the double heat insulation cable type outer heat insulation material type of the second embodiment, a heat insulation material layer 22 is formed inside a metal tube body 21 as an outer tube body, and a heat insulation air layer 23 is formed inside the heat insulation material layer 22. The cable housing space 24 is provided inside the heat insulating air layer 23.

  Here, the heat insulating material layer 22 is a tubular body constituting a double insulated cable box, and the rock wool molded into a plate shape is attached to the inside of the metal tubular body 21 located on the outermost side. Formed.

  The adiabatic air layer 23 is formed by combining a second metal tube body 25 in contact with the inner surface of the heat insulating material layer 22 and a third metal tube body 26 having a diameter smaller than that of the second metal tube body 25. Is.

  In other words, the heat insulating air layer 23 is maintained at a distance so as to maintain a constant distance as an air layer between the second metal tube 25 serving as the outer tube and the third metal tube 26 serving as the inner tube. It is formed using a member (illustration is omitted).

  The storage space 24 exists inside the double heat insulation cable box in order to store various cables such as a communication cable, an information transmission cable such as an optical fiber cable, and a power cable.

  In addition, although illustration is abbreviate | omitted, it replaces with the rock wool which comprises the heat insulation material layer of the double heat insulation cable box of the said 1st Embodiment and 2nd Embodiment, Except using ceramic fiber, it carries out similarly, and is outside heat insulation. A double insulated cable box of air type and outer insulation material type was constructed.

[Test example]

  Comparison of changes in internal temperature of double insulated cable box of outer insulated air type and outer insulated material type using rock wool (120kg / cubic meter) and insulated cable box whose insulation layer is composed only of rock wool for comparison. A test was conducted.

  In both types, the thickness of the heat insulating material layer was 50 mm, the thickness of the heat insulating air layer was 10 mm, and the thickness of the heat insulating layer in the case of rock wool alone was 50 mm.

The result is shown in FIG.
As shown in FIG. 3, the time when the temperature reached 100 ° C. was about 18 minutes for the type composed only of rock wool, about 24 minutes for the outer heat insulating material type, and about 31 minutes for the outer heat insulating air type.

  The internal temperature of the double insulated cable box of the outer insulated air type and outer insulated material type using ceramic fiber (130 kg / cubic meter), and the insulated cable box whose thermal insulation layer is composed only of rock wool for comparison. A change comparison test was conducted.

  In both types, the thickness of the heat insulating material layer was 50 mm, the thickness of the heat insulating air layer was 10 mm, and the thickness of the heat insulating layer in the case of using only ceramic fibers was 50 mm.

The result is shown in FIG.
As shown in FIG. 4, the time when the temperature reached 100 ° C. was about 17 minutes for the type composed only of ceramic fibers, about 23 minutes for the outer heat insulating material type, and about 27 minutes for the outer heat insulating air type.

Considering the results, it was confirmed that the outer heat insulating air type is more effective in suppressing the temperature rise inside when the heat insulating material is the same.

Claims (3)

  A double insulated cable box having a heat insulating air layer and a heat insulating material layer inside an outer tube body, and further having a cable storage space inside.   A double insulated cable box, wherein a heat insulating air layer is formed inside an outer tubular body, a heat insulating material layer is formed inside the heat insulating air layer, and a cable storage space is further provided inside. A double heat insulation cable box, characterized in that a heat insulating material layer is formed inside the outer tube body, a heat insulating air layer is formed inside the heat insulating material layer, and a cable storage space is further provided inside.

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