Fireproof and flame-retardant cable surface layer structure

Abstract

The utility model relates to a fireproof and flame-retardant cable surface layer structure, which belongs to the technical field of cable structures and comprises a conductor, a fireproof structure located outside the conductor and an outer sheath located on the fireproof structure. The fireproof structure comprises a wrapping tape wound outside the insulating layers and a first filling layer filled between the wrapping tape and the insulating layers, the conductors are divided into a plurality of bundles, and each bundle of conductor is sleeved with an insulating layer; and the wrapping tape is in a strip shape and is wound outside the insulating layer in a manner of inclining to the axial direction of the conductor. According to the fireproof and flame-retardant cable surface layer structure, the multiple sections of conductors are separated from one another and are wound and connected through the wrapping tape, so that the internal heat conduction effect of the conductors can be reduced, in addition, the external inner sheath is matched for wrapping, the cable core of the cable can realize external fire release, and in cooperation with the internal filling layer, the fireproof and flame-retardant effects are achieved. In addition, due to the corrugated arrangement of the inner sheath, the number of joints can be conveniently reduced.

Description

Technical Field

[0001] The present application relates to the technical field of cable structures, and in particular to a fire-resistant and flame-retardant cable surface structure. Background Art

[0002] Cable is an electrical device consisting of conductor, insulation layer, sheath and other accessories used to transmit electrical energy or signals.

[0003] Common cable structures add fire-retardant materials to the outside of the insulating layer wrapped around the conductor to improve the flame retardant effect of the cable. However, due to the large continuous length of the surface layer in the cable structure, there are too many joints and the long-distance cable construction is too difficult, making the fire-retardant structure difficult to implement. In this regard, a fire-retardant cable surface structure is proposed to solve the above-mentioned problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present application provides a fire-resistant and flame-retardant cable surface structure, which has the advantages of reducing the number of joints and being easy to implement on the cable surface.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a fire-retardant cable surface structure, comprising a conductor, a fire-retardant structure located outside the conductor, and an outer sheath located at the fire-retardant structure, the conductor being divided into a plurality of bundles, each bundle of the conductors being provided with an insulating layer on the outside, the fire-retardant structure comprising a wrapping tape wrapped around the outside of the insulating layer and a first filling layer filled between the wrapping tape and the insulating layer.

[0006] Furthermore, the wrapping tape is in a tape shape and is wound around the outside of the insulating layer in a direction oblique to the axial direction of the conductor.

[0007] Furthermore, the outer portion of the wrapping tape is wrapped with an inner sheath, and a second filling layer is filled between the inner sheath and the wrapping tape.

[0008] Furthermore, the inner sheath is longitudinally wrapped with copper strips and then welded to form a copper tube, which is then continuously rolled to form a corrugated shape.

[0009] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0010] The fireproof and flame-retardant cable surface structure separates multiple conductors from each other and connects them by wrapping tape, so that the internal heat conduction effect of the conductor can be reduced. In addition, the external inner sheath is wrapped to enable the cable core to be externally ignited. The internal filling layer effectively improves the fireproof and flame-retardant effect of the cable. In addition, the corrugated setting of the inner sheath can conveniently reduce the number of joints and improve the implementation rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the overall structure of this application;

[0012] Figure 2 A structural cross-sectional view of this application;

[0013] Figure 3 This is a structural stereogram of the inner sheath of this application.

[0014] In the figure: 1. conductor; 2. insulation layer; 3. wrapping tape; 4. inner sheath; 5. outer sheath; 6. first filling layer; 7. second filling layer. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0016] See also Figure 1-3 A fire-retardant cable surface structure in this embodiment includes a conductor 1, a fire-retardant structure located outside the conductor 1, and an outer sheath 5 located at the fire-retardant structure, wherein the conductor 1 is divided into several bundles, and an insulating layer 2 is provided on the outside of each bundle of conductors 1.

[0017] The present application twists the conductors 1 into several bundles, so that the heat between the several bundles of conductors 1 is not easily concentrated, and the conductors 1 have a certain fire prevention capability.

[0018] In this embodiment, the fireproof structure includes a wrapping tape 3 wound around the outside of the insulating layer 2. The wrapping tape 3 is in the shape of a strip and is wound around the outside of the insulating layer 2 obliquely to the axial direction of the conductor 1, so that the conductor 1 twisted into several sections can be wound and fixed.

[0019] Specifically, the wrapping tape 3 is made of yarn of mineral rock fiber. Mineral rock fiber is a fiber material made from melted ore, has good high temperature resistance and heat insulation performance, and can be used for fire protection treatment in high temperature environment.

[0020] It should be noted that the fireproof structure further includes a first filling layer 6 filled between the wrapping tape 3 and the insulating layer 2 , the outer portion of the wrapping tape 3 is wrapped with an inner sheath 4 , and a second filling layer 7 is filled between the inner sheath 4 and the wrapping tape 3 .

[0021] Specifically, the first filling layer 6 and the second filling layer 7 are both made of alkali-free glass fiber and are densely filled to maintain a high degree of fire resistance.

[0022] Preferably, the inner sheath 4 is a soft copper sheath, which is longitudinally wrapped with a copper strip and then welded to form a copper tube, and then continuously rolled to form a corrugated shape.

[0023] This design enables interconnected cables to be expanded and then screwed together through two sections of corrugated tube-shaped inner sheaths 4, thereby reducing the number of joints used and facilitating multi-section applications of fireproof structures.

[0024] The working principle of the above embodiment is:

[0025] The multi-segment twisted conductor 1 is wrapped by an external insulating layer 2, and then the multi-segment insulating layer 2 is wound and fixed by an external wrapping tape 3, so that the multi-segment conductor 1 can be twisted to form a cable core structure of the cable. At this time, the multi-segment conductors 1 of the cable core are spaced from each other and insulated by the alkali-free glass fiber of the first filling layer 6, so that the internal thermal conductivity of the cable is reduced. In addition, the cable core structure of the cable is wrapped by the external second filling layer 7 and the inner sheath 4, so that effective fire protection is achieved. When the multi-segment cable is connected, the two sections of the corrugated inner sheath 4 are screwed together to reduce the use of joints.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A fire-resistant and flame-retardant cable surface structure, comprising a conductor (1), a fire-resistant structure located outside the conductor (1), and an outer sheath (5) located on the fire-resistant structure, characterized in that: The conductors (1) are divided into a plurality of bundles, each bundle of the conductors (1) is sheathed with an insulating layer (2), and the fireproof structure comprises a wrapping tape (3) wound around the outside of the insulating layer (2) and a first filling layer (6) filled between the wrapping tape (3) and the insulating layer (2).

2. The fire-retardant cable surface structure according to claim 1, characterized in that: The wrapping tape (3) is in the shape of a tape and is wound around the outside of the insulating layer (2) in a direction oblique to the axial direction of the conductor (1).

3. The fire-retardant cable surface structure according to claim 1, characterized in that: The outer portion of the wrapping tape (3) is wrapped with an inner sheath (4), and a second filling layer (7) is filled between the inner sheath (4) and the wrapping tape (3).

4. The fire-retardant cable surface structure according to claim 3, characterized in that: The inner sheath (4) is longitudinally wrapped with copper strips and then welded to form a copper tube, which is then continuously rolled to form a corrugated shape.

Images