Anti-extrusion halogen-free flame-retardant cable

Abstract

The utility model relates to an anti-extrusion halogen-free flame-retardant cable, which comprises a plurality of wire cores, and a wrapping layer, an inner sheath layer, a buffer layer and an outer sheath layer which sequentially wrap the outer sides of the wire cores from inside to outside, the plurality of wire cores are distributed in the circumferential direction, and a separation sheet is arranged between every two adjacent wire cores. And the buffer layer comprises a plurality of mutually crossed buffer bodies. The main purpose of the utility model is to provide the anti-extrusion halogen-free flame-retardant cable, the buffer layer and the separator are arranged to buffer the extrusion force, the wire cores are effectively protected, and the overall anti-extrusion performance of the cable is improved; meanwhile, through the ingenious structural design, the cable has good stretch resistance and insulation performance; the overall structural design is reasonable, the cable transmission is more stable, and the service life is longer.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to an anti-extrusion halogen-free flame-retardant cable. Background Art

[0002] A cable is a kind of conductor often used in modern society, and various cables are applied in related fields such as electrical control and power transmission. For existing cables, their compressive resistance is weak, and they are extremely vulnerable to external forces, resulting in cable deformation and damage to the internal conductors.

[0003] In the prior art, the Chinese patent document with the publication number of CN106782810A discloses a moisture-proof and compressive cable, which includes a wire core externally coated with an inner insulating layer. The wire cores are at least 4 arranged circumferentially. An aramid fiber structure is arranged between the wire cores. A rubber layer is arranged outside the wire cores. Convex ribs parallel to the axial direction of the cable are arranged on the outer side wall of the rubber layer. A bamboo charcoal layer and a wear-resistant layer are arranged outside the rubber layer. Although the cable protected by this technical solution has a certain compressive resistance, the adjacent two wire cores are in direct contact, and when being extruded, the adjacent two wire cores are prone to damage due to mutual extrusion. Summary of the Utility Model

[0004] In order to overcome the deficiencies of the prior art, the purpose of the utility model is to provide an anti-extrusion halogen-free flame-retardant cable with remarkable anti-extrusion performance and good anti-tensile performance.

[0005] To solve the above problems, the technical solution adopted by the utility model is as follows:

[0006] An anti-extrusion halogen-free flame-retardant cable includes a plurality of wire cores and a wrapping layer, an inner sheath layer, a buffer layer, and an outer sheath layer that are sequentially coated outside the wire cores from the inside to the outside. The plurality of wire cores are circumferentially distributed, and a separator is arranged between adjacent two wire cores. The buffer layer includes a plurality of mutually crossed buffer bodies.

[0007] Further, a cavity is arranged inside the separator.

[0008] Further, the cross-sectional shape of the separator is spindle-shaped.

[0009] Further, the cross-section of the buffer body is elliptical annular.

[0010] Further, adjacent two buffer bodies are mutually crossed, and the distance between two adjacent ends on adjacent two buffer bodies is one-third of the distance between the two ends of the buffer body.

[0011] Further, a strengthening column is also arranged inside the wrapping layer. The strengthening column includes alloy wires and a rubber sleeve coated outside the alloy wires.

[0012] Furthermore, an armor layer is provided between the inner sheath layer and the buffer layer.

[0013] Furthermore, a waterproof layer and a shielding layer are successively provided from the inside to the outside between the buffer layer and the outer sheath layer.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing a buffer layer and spacer sheets to buffer the extrusion force, the present utility model effectively protects the wire core and improves the overall anti-extrusion performance of the cable; at the same time, through a clever structural design, the cable has good anti-tensile ability and insulation performance; the overall structural design is reasonable, the cable transmission is more stable, and the service life is longer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of an anti-extrusion halogen-free flame-retardant cable of the present utility model;

[0016] Wherein, 1. Outer sheath layer; 2. Shielding layer; 3. Waterproof layer; 4. Buffer layer; 41. Buffer body; 5. Armor layer; 6. Inner sheath layer; 7. Wrapping layer; 8. Wire core; 81. Conductor; 82. Insulation layer; 9. Spacer sheet; 91. Cavity; 10. Rubber sleeve; 11. Alloy wire. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The present utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0018] It should be noted that in the description of the technical solutions of the present utility model, in order to clearly describe the technical features of the present utility model, some orientation words such as "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the orientation of the drawings of the present utility model.

[0019] Embodiment

[0020] As Figure 1 shown, an anti-extrusion halogen-free flame-retardant cable of the present embodiment includes a plurality of wire cores 8 and a wrapping layer 7, an inner sheath layer 6, a buffer layer 4, and an outer sheath layer 1 successively coated on the outside of the wire core 8 from the inside to the outside. An armor layer 5 is further provided between the inner sheath layer 6 and the buffer layer 4.

[0021] Furthermore, in the present embodiment, a waterproof layer 3 and a shielding layer 2 are successively provided from the inside to the outside between the buffer layer 4 and the outer sheath layer 1. In the present embodiment, the wrapping layer 7 is made of a water-blocking and fireproof mica tape. The inner sheath layer 6 is made of an ethylene vinyl acetate copolymer sheath. The armor layer 5 is made of a steel wire braid layer. The buffer layer 4 is made of a flame-retardant silicone rubber. The waterproof layer 3 is made of an acrylic waterproof material. The shielding layer 2 is made of a tinned copper wire braid.

[0022] The outer sheath layer 1 is made of a low-smoke, halogen-free and flame-retardant material, which is a halogen-free flame-retardant material. When burning, it will not release halogen-containing gases, has a low smoke concentration, does not contain toxic gases, and has excellent flame-retardant performance.

[0023] A filling layer (not marked in the figure) is also arranged inside the wrapping layer 7, and the filling layer is made of non-woven PP rope material.

[0024] In addition, the wire core 8 in this embodiment includes a conductor 81 and an insulating layer 82 coated on the outer side of the conductor 81. The insulating layer 82 is a polyurethane insulating layer.

[0025] The buffer layer 4 includes a plurality of mutually intersecting buffer bodies 41. The cross-section of the buffer body 41 is in an elliptical ring shape. Adjacent two of the buffer bodies 41 intersect with each other, and the distance between two adjacent ends on the adjacent two buffer bodies 41 is one-third of the distance between the two ends of the buffer body 41.

[0026] In this embodiment, the buffer body 41 is made of high-elastic rubber. The major axis of the buffer body 41 is perpendicular to the radial direction of the cable. With this structural design, when the cable is subjected to an external extrusion force, the buffer body 41 offsets part of the extrusion force through deformation. The intersecting design can cause the force to be dispersed multiple times during the conduction process, avoiding large local forces on the cable.

[0027] In this embodiment, the multiple wire cores 8 are circumferentially distributed, and a spacer 9 is arranged between adjacent two of the wire cores 8. A cavity 91 is arranged inside the spacer 9. The cavity 91 is used to provide a deformation space for the spacer 9. The cross-sectional shape of the spacer 9 is spindle-shaped. The cross-sectional shape of the cavity 91 is the same as that of the spacer 9. With this structural design, the spacer 9 is located between adjacent two wire cores 8. When the cable is subjected to an external extrusion force, the adjacent two wire cores 8 approach each other due to the force, and the acting force is transmitted to the spacer 9. The spacer 9 offsets part of the extrusion force through deformation, thereby avoiding damage to the adjacent two wire cores 8 due to mutual extrusion.

[0028] In this embodiment, a reinforcing column is also arranged inside the wrapping layer 7. The reinforcing column includes an alloy wire 11 and a rubber sleeve 10 coated on the outer side of the alloy wire 11. The alloy wire 11 is a semi-rigid copper alloy wire, which is used to improve the overall tensile performance of the cable. The reinforcing column is located at the central position of the wrapping layer 7, and the multiple wire cores 8 are evenly distributed around the reinforcing column. At the same time, one end of the spacer 9 abuts against the outer wall of the reinforcing column. With this structural design, when the cable is subjected to an external extrusion force, the spacer 9 is subjected to an extrusion force from outside to inside and has a tendency to move inward. However, since one end of it abuts against the reinforcing column, the degree of freedom of the spacer 9 to move inward along the radial direction of the cable is restricted, thereby avoiding the situation that the spacer 9 moves or is displaced due to the extrusion force.

[0029] A halogen-free flame-retardant cable with anti-extrusion property of the present utility model buffers the extrusion force through the buffer layer 4 and the separator 9, effectively protecting the wire core 8 and improving the overall anti-extrusion performance of the cable; at the same time, through the ingenious structural design, the cable has good anti-tensile ability and insulation performance; the overall structural design is reasonable, the cable transmission is more stable, and the service life is longer.

[0030] For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all such changes and deformations should fall within the protection scope of the claims of the present utility model.

Claims

1. A crush-resistant halogen-free flame-retardant cable, characterized in that: It includes a plurality of wire cores (8), and a wrapping layer (7), an inner sheath layer (6), a buffer layer (4), and an outer sheath layer (1) that are sequentially coated on the outer side of the wire cores (8) from the inside to the outside. The plurality of wire cores (8) are circumferentially distributed, and a spacer (9) is provided between adjacent wire cores (8). The buffer layer (4) includes a plurality of mutually intersecting buffer bodies (41).

2. The halogen-free flame-retardant cable resistant to extrusion according to claim 1, wherein: A cavity (91) is provided inside the spacer (9).

3. The halogen-free flame-retardant cable resistant to extrusion according to claim 2, characterized in that: The cross-sectional shape of the spacer (9) is spindle-shaped.

4. The halogen-free flame-retardant cable resistant to extrusion according to claim 1, wherein: The cross-section of the buffer body (41) is elliptical ring-shaped.

5. The halogen-free flame retardant cable resistant to extrusion according to claim 4, characterized in that: Adjacent buffer bodies (41) intersect with each other, and the distance between two adjacent ends on the adjacent buffer bodies (41) is one-third of the distance between the two ends of the buffer body (41).

6. The anti-extrusion halogen-free flame-retardant cable according to claim 1 or 5, characterized in that: Reinforcing columns are further provided inside the wrapping layer (7). The reinforcing columns include alloy wires (11) and rubber sleeves coated on the outer sides of the alloy wires (11).

7. The halogen-free flame-retardant cable resistant to extrusion according to claim 1, characterized in that: An armor layer (5) is further provided between the inner sheath layer (6) and the buffer layer (4).

8. The anti-extrusion halogen-free flame-retardant cable according to claim 7, wherein: A waterproof layer (3) and a shielding layer (2) are sequentially provided between the buffer layer (4) and the outer sheath layer (1) from the inside to the outside.

Images