Double-layer co-extrusion bending-resistant flame-retardant cable

Abstract

The utility model discloses a double-layer co-extrusion bending-resistant flame-retardant cable, which comprises a cable body, a stranded conductor is arranged at the center of the cable body, an insulating layer is wrapped on the outer side of the stranded conductor, two sheath layers are sleeved on the outer side of the cable body, an occlusion structure is arranged between the two sheath layers, and the two sheath layers are wrapped on the outer side of the cable body. The two sheath layers are engaged together through an engagement structure, and relates to the technical field of cables, the outer sheath layer and the inner sheath layer which are engaged with each other are arranged, so that the bending difficulty of the outer sheath layer and the inner sheath layer is effectively improved under the limiting action of a first bulge and a second bulge between the outer sheath layer and the inner sheath layer; therefore, the anti-bending performance of the cable body is effectively improved. The flame-retardant particles are arranged between the insulating layer and the inner sheath layer, so that the flame-retardant performance of the cable body can be effectively improved; and the outer bulges on the outer wall of the outer sheath layer also increase the difficulty of completeness of the outer sheath layer, so that the anti-bending performance of the cable body is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a double-layer co-extruded bending-resistant flame-retardant cable. Background Art

[0002] The Chinese utility model patent with publication number CN210778009U discloses a low-smoke, halogen-free, flame-retardant double-layer co-extruded insulated radiation-cross-linked cable, comprising a twisted conductor, an insulating layer, an inner insulating layer, an outer insulating layer, an oxygen barrier layer, a filler, a sheath, a protective layer, a shielding layer, a flame-retardant layer, a pressure-resistant layer, a corrosion-resistant layer and a wear-resistant coating. The outer surface of the twisted conductor is wrapped with an insulating layer, the outer surface of the insulating layer is wrapped with an oxygen barrier layer, the inner surface of the oxygen barrier layer and the outer surface of the insulating layer are filled with fillers, the outer surface of the oxygen barrier layer is wrapped with a protective layer, and the outer surface of the protective layer is sprayed with a wear-resistant coating. It has the advantage of good protective performance and solves the problem that the existing cross-linked cables have good insulation effect.

[0003] The above patent has the following deficiencies:

[0004] There is no structure between the sheath and the protective layer. When the outermost sheath is twisted, the protective layer is easily twisted along with the sheath, which can easily bend and cause the cable's anti-bending performance to deviate. Under high-intensity bending or stretching, it is easy to break, reducing its service life. Utility Model Content

[0005] In view of the problems existing in the existing double-layer co-extruded bending-resistant flame-retardant cable, the utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a double-layer co-extruded bend-resistant flame-retardant cable, which solves the problem that no structure is set between the sheath and the protective layer in the above-mentioned patent. When the outermost sheath is twisted, the protective layer is easy to twist along with the sheath, so it is easy to bend and cause the cable's anti-bending performance deviation. Under high-intensity bending or stretching, it is easy to break, thereby reducing its service life.

[0007] In order to solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0008] A double-layer co-extruded bending-resistant flame-retardant cable comprises a cable body, wherein a twisted conductor is arranged at the center of the cable body, an insulating layer is wrapped around the outside of the twisted conductor, two sheath layers are sheathed on the outside of the cable body, a bite structure is arranged between the two sheath layers, and the two sheath layers are bite-jointed together by the bite structure.

[0009] As a preferred solution of a double-layer co-extruded bend-resistant flame-retardant cable described in the utility model, the two sheath layers are respectively arranged as an inner sheath layer and an outer sheath layer, the inner wall of the outer sheath layer is integrally provided with first protrusions at equal distances, the outer wall of the inner sheath layer is integrally provided with second protrusions at equal distances, and the first protrusion and the second protrusion are staggered and engaged with each other.

[0010] As a preferred solution of a double-layer co-extruded bend-resistant flame-retardant cable described in the utility model, wherein: a first bite area is arranged between adjacent first protrusions, a second bite area is arranged between adjacent second protrusions, the first protrusion is located at the second bite area, and the second protrusion is located at the first bite area.

[0011] As a preferred solution of the double-layer co-extruded bend-resistant flame-retardant cable described in the utility model, the insulating layer is set to rubber material, and the inner sheath layer and the outer sheath layer are both set to polyvinyl chloride or polyethylene or polyperfluoroethylene propylene or nylon or polyolefin chlorinated polyethylene or chlorosulfonated polyethylene or chloroprene rubber or silicone rubber.

[0012] As a preferred solution of the double-layer co-extruded bending-resistant flame-retardant cable described in the utility model, flame-retardant particles are filled between the insulation layer and the inner sheath layer.

[0013] As a preferred solution of the double-layer co-extruded bend-resistant flame-retardant cable described in the utility model, it also includes a corrosion-resistant layer and a flame-retardant coating, the corrosion-resistant layer is set to a polyethylene material, the corrosion-resistant layer is located between the insulating layer and the inner sheath layer, and the flame-retardant coating is formed by spraying a flame-retardant paint on the surface of the corrosion-resistant layer.

[0014] Compared with existing technologies:

[0015] 1. By providing an outer sheath layer and an inner sheath layer that bite each other, the difficulty of bending the outer sheath layer and the inner sheath layer is effectively increased under the limiting effect of the first protrusion and the second protrusion between the outer sheath layer and the inner sheath layer, thereby effectively improving the anti-bending performance of the cable body;

[0016] 2. By arranging flame-retardant particles between the insulating layer and the inner sheath layer, the flame-retardant performance of the cable body can be effectively improved; and the outer protrusions on the outer wall of the outer sheath layer also increase the difficulty of the outer sheath layer being intact, further improving the bending resistance of the cable body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure provided for Example 1 of the utility model;

[0018] Figure 2 Provided for the utility model embodiment 1 Figure 1 sectional view of;

[0019] Figure 3 A schematic diagram of the interface of the outer sheath layer provided in Example 1 of the utility model;

[0020] Figure 4 This is a schematic diagram of the interface of the inner sheath layer provided in Example 1 of the utility model;

[0021] Figure 5 This is a schematic diagram of the structure provided for Example 2 of the utility model.

[0022] In the figure: cable body 100, outer sheath layer 101, outer protrusion 1011, first protrusion 1012, first bite area 1013, inner sheath layer 102, second protrusion 1021, second bite area 1022, flame retardant particles 103, twisted conductor 104, insulation layer 105, corrosion-resistant layer 106, flame retardant coating 107. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clear, the implementation methods of the present invention will be further described in detail below with reference to the accompanying drawings.

[0024] Embodiment 1:

[0025] The utility model provides a double-layer co-extruded bending-resistant flame-retardant cable. Figure 1-4 , including a cable body 100, a twisted conductor 104 is arranged at the center of the cable body 100, the outer side of the twisted conductor 104 is wrapped with an insulating layer 105, the outer side of the cable body 100 is provided with two sheath layers, a bite structure is arranged between the two sheath layers, and the two sheath layers are bite together through the bite structure.

[0026] The two sheath layers are respectively arranged as an inner sheath layer 102 and an outer sheath layer 101. External protrusions 1011 are equidistantly provided on the outer wall of the outer sheath layer 101. Under the action of the external protrusions 1011, the outer sheath layer 101 of the cable body 100 is not easy to bend, thereby improving the bending resistance of the cable body 100. First protrusions 1012 are equidistantly provided on the inner wall of the outer sheath layer 101, and second protrusions 1021 are equidistantly provided on the outer wall of the inner sheath layer 102. The first protrusion 1012 and the second protrusion 1021 are staggered and bitten, that is, the first protrusion 1012 and the second protrusion 1021 are squeezed together to achieve biting. Therefore, when the outer sheath layer 101 is twisted, due to the biting restriction between the first protrusion 1012 and the second protrusion 1021, it is possible to increase the difficulty of bending the inner sheath layer 102 and the outer sheath layer 101, thereby improving the bending resistance.

[0027] A first bite area 1013 is disposed between adjacent first protrusions 1012 , a second bite area 1022 is disposed between adjacent second protrusions 1021 , the first protrusions 1012 are located at the second bite area 1022 , and the second protrusions 1021 are located at the first bite area 1013 .

[0028] The insulating layer 105 is made of rubber material, the inner sheath layer 102 and the outer sheath layer 101 are both made of polyvinyl chloride PVC or polyethylene PE or polyperfluoroethylene propylene F46 or nylon or polyolefin chlorinated polyethylene CPE or chlorosulfonated polyethylene CSM or chloroprene rubber or silicone rubber, and flame retardant particles 103 are provided between the insulating layer 105 and the inner sheath layer 102. The flame retardant particles 103 are any form of flame retardant particles in existing cables, and the flame retardant particles 103 are used to flame retard the insulating layer 105 and the twisted conductor 104 therein.

[0029] Embodiment 2:

[0030] Refer to the attached Figure 5 , which is different from Example 1: it also includes a corrosion-resistant layer 106 and a flame-retardant coating 107, the corrosion-resistant layer 106 is set to a polyethylene material, the corrosion-resistant layer 106 is located between the insulating layer 105 and the inner sheath layer 102, and the flame-retardant coating 107 is formed by spraying a flame-retardant paint on the surface of the corrosion-resistant layer 106; the corrosion resistance of the cable body 100 is improved by setting the corrosion-resistant layer 106, and the flame-retardant coating 107 is used to further improve the flame retardancy of the cable body 100.

[0031] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A double-layer co-extruded bending-resistant flame-retardant cable, comprising a cable body (100), wherein a twisted conductor (104) is provided at the center of the cable body (100), and an insulating layer (105) is wrapped around the outer side of the twisted conductor (104), characterized in that: The outer side of the cable body (100) is covered with two sheath layers, a bite structure is provided between the two sheath layers, and the two sheath layers are bitten together through the bite structure.

2. A double-layer co-extruded bending-resistant flame-retardant cable according to claim 1, characterized in that: The two sheath layers are respectively arranged as an inner sheath layer (102) and an outer sheath layer (101); first protrusions (1012) are integrally provided on the inner wall of the outer sheath layer (101) at equal distances; second protrusions (1021) are integrally provided on the outer wall of the inner sheath layer (102) at equal distances; the first protrusions (1012) and the second protrusions (1021) are staggered and engaged with each other.

3. A double-layer co-extruded bending-resistant flame-retardant cable according to claim 2, characterized in that: A first bite area (1013) is arranged between adjacent first protrusions (1012), a second bite area (1022) is arranged between adjacent second protrusions (1021), the first protrusion (1012) is located at the second bite area (1022), and the second protrusion (1021) is located at the first bite area (1013).

4. A double-layer co-extruded bending-resistant flame-retardant cable according to claim 2, characterized in that: The insulating layer (105) is made of rubber material, and the inner sheath layer (102) and the outer sheath layer (101) are both made of polyvinyl chloride, polyethylene, polyperfluoroethylene propylene, nylon, polyolefin chlorinated polyethylene, chlorosulfonated polyethylene, chloroprene rubber, or silicone rubber.

5. A double-layer co-extruded bending-resistant flame-retardant cable according to claim 1, characterized in that: A layer filled with flame retardant particles (103) is provided between the insulating layer (105) and the inner sheath layer (102).

6. A double-layer co-extruded bending-resistant flame-retardant cable according to claim 1, characterized in that: It also includes a corrosion-resistant layer (106) and a flame-retardant coating (107); the corrosion-resistant layer (106) is made of polyethylene material; the corrosion-resistant layer (106) is located between the insulating layer (105) and the inner sheath layer (102); and the flame-retardant coating (107) is formed by spraying a flame-retardant coating on the surface of the corrosion-resistant layer (106).

Images