Flame-retardant B1-level power cable for building

Abstract

The utility model discloses a flame-retardant B1-level power cable for buildings, which sequentially comprises a flame-retardant wire core, an inner sheath, a braid layer and an outer sheath from inside to outside, a shielding layer and an insulating layer are sequentially arranged between the flame-retardant wire core and the inner sheath from inside to outside, a plurality of supporting cavities are formed in one side, close to the outside, of the outer sheath in an annular array mode, and the supporting cavities are communicated with the shielding layer. The outer wall of the outer sheath is provided with an installation gap communicated with the supporting cavity, the supporting cavity is internally provided with a tensile rope which can be disassembled and assembled through the installation gap, and the width of the installation gap is smaller than the radius of the tensile rope. According to the flame-retardant B1-level power cable for the building, the tensile strength of the cable is increased, multi-layer protection is provided, effective support is provided, the cable is not easy to damage when being laid, and the service life and the flame-retardant capability are ensured.

Description

Technical Field

[0001] The utility model relates to the field of cables, in particular to a flame-retardant B1-level power cable for buildings. Background Art

[0002] A flame-retardant cable refers to a cable that, under specified test conditions, when the specimen is burned and the test fire source is removed, the spread of the flame is only within a limited range, and the residual flame or afterglow can self-extinguish within a limited time. When the existing cables are laid on buildings, they bear a large external load at building corners. Some of the existing cables have insufficient protection and are easily damaged by external forces during laying, affecting the service life and flame-retardant ability of the cables. Content of the Utility Model

[0003] In view of the above problems, the utility model provides a flame-retardant B1-level power cable for buildings, which is not easily damaged during cable laying, ensuring the service life and flame-retardant ability.

[0004] The technical solution of the utility model is as follows:

[0005] A flame-retardant B1-level power cable for buildings includes, from inside to outside in sequence, a flame-retardant core, an inner sheath, a braided layer, and an outer sheath. Between the flame-retardant core and the inner sheath, a shielding layer and an insulating layer are provided in sequence from inside to outside. On the outer side of the outer sheath, a plurality of support cavities are arranged in a circumferential array, and an installation gap communicating with the support cavities is provided on the outer wall of the outer sheath. A tensile rope that can be disassembled and assembled through the installation gap is arranged in the support cavity, and the width of the installation gap is smaller than the radius of the tensile rope.

[0006] In a further technical solution, a fireproof tape is provided between the inner sheath and the braided layer.

[0007] In a further technical solution, perforations are arranged at intervals along the length direction of the installation gap.

[0008] In a further technical solution, the braided layer is a metal braided layer.

[0009] In a further technical solution, both the inner sheath and the outer sheath are made of low-smoke and halogen-free polyolefin materials.

[0010] In a further technical solution, the tensile rope is a steel wire rope.

[0011] In a further technical solution, the fireproof tape is made of polypropylene material.

[0012] The beneficial effects of the utility model are:

[0013] The inner shell of the support cavity of the outer sheath selectively disassembles and installs the tensile rope from the installation gap according to the laying condition of the cable to increase the tensile performance of the cable. In addition, the tensile rope also plays a role in support and protection, and can cooperate with the braided layer to play a dual protection role for the inner sheath and the cable structure inside, so that the cable is not easily damaged during laying. Description of the Drawings

[0014] Figure 1 is a schematic cross-sectional view of a flame-retardant B1-class power cable for buildings according to an embodiment of the present invention;

[0015] Figure 2 is a schematic side view of a flame-retardant B1-class power cable for buildings according to an embodiment of the present invention.

[0016] Description of the Reference Numerals:

[0017] 1, flame-retardant core; 2, inner sheath; 3, braided layer; 4, outer sheath; 5, shielding layer; 6, insulating layer; 7, support cavity; 8, installation gap; 9, tensile rope; 10, fireproof tape; 11, perforation. Detailed Embodiment

[0018] The following further describes the embodiments of the present invention with reference to the drawings.

[0019] Embodiment:

[0020] As Figure 1 - Figure 2 shown, a flame-retardant B1-class power cable for buildings includes, from inside to outside, a flame-retardant core 1, an inner sheath 2, a braided layer 3, and an outer sheath 4 in sequence. Both the inner sheath 2 and the outer sheath 4 are made of low-smoke and halogen-free polyolefin materials. The braided layer 3 can be a metal braided layer made of aluminum material. Between the flame-retardant core 1 and the inner sheath 2, a shielding layer 5 and an insulating layer 6 are provided in sequence from inside to outside. The shielding layer 5 is made of aluminum foil material, and the insulating layer 6 is made of polyethylene material. A plurality of support cavities 7 are annularly arranged on the outer side of the outer sheath 4. The support cavity 7 can be a circular cross-section cavity matching the tensile rope 9, which is beneficial to the stable installation of the tensile rope 9. An installation gap 8 communicating with the support cavity 7 is provided on the outer wall of the outer sheath 4. A tensile rope 9 that can be disassembled and installed through the installation gap 8 is provided in the support cavity 7. The tensile rope 9 can be made of steel wire rope. The width of the installation gap 8 is smaller than the radius of the tensile rope 9.

[0021] The working principle of the above technical solution is as follows:

[0022] The inner shell of the support cavity 7 of the outer sheath 4 selectively disassembles and installs the tensile rope 9 from the installation gap 8 according to the laying condition of the cable to increase the tensile performance of the cable. In addition, the tensile rope 9 also plays a role in support and protection, and can cooperate with the braided layer 3 to play a dual protection role for the inner sheath 2 and the cable structure inside, which can effectively prevent electromagnetic interference, also has a flame-retardant effect, and can effectively prevent external damage, so that the cable is not easily damaged during laying.

[0023] In another embodiment, as Figure 1 shown, a fireproof tape 10 is provided between the inner sheath 2 and the braided layer 3. The polypropylene material can be selected and is provided outside the inner sheath 2 in a winding manner. The flame retardant effect is further improved.

[0024] In another embodiment, as Figure 2 shown, perforations 11 are provided at intervals along the length direction of the installation gap 8. It is convenient to insert the tensile rope 9 into the support cavity 7 from the perforations 11.

[0025] The above-described embodiments only represent the specific implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model.

Claims

1. A flame-retardant B1-class power cable for construction, characterized in that, It includes a flame-retardant core, an inner sheath, a braided layer and an outer sheath from inside to outside. A shielding layer and an insulating layer are sequentially arranged between the flame-retardant core and the inner sheath from inside to outside. A plurality of support cavities are annularly arranged on the outer side of the outer sheath, and an installation gap communicating with the support cavities is arranged on the outer wall of the outer sheath. A tensile rope that can be disassembled and assembled through the installation gap is arranged in the support cavity, and the width of the installation gap is smaller than the radius of the tensile rope.

2. A flame-retardant B1-class power cable for construction according to claim 1, characterized in that, A fireproof tape is arranged between the inner sheath and the braided layer.

3. A flame-retardant B1-class power cable for construction according to claim 1, characterized in that, Perforations are arranged at intervals along the length direction of the installation gap.

4. A flame-retardant B1-grade power cable for construction according to claim 1, characterized in that, The braided layer is a metal braided layer.

5. A flame-retardant B1-grade power cable for buildings according to claim 1, characterized in that, Both the inner sheath and the outer sheath are made of low-smoke and halogen-free polyolefin materials.

6. A flame-retardant B1-class power cable for construction according to claim 1, characterized in that, The tensile rope is a steel wire rope.

7. The flame-retardant B1-class power cable for construction according to claim 2, characterized in that, The fireproof tape is made of polypropylene material.

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