Cable with flame-retardant layer

Abstract

The utility model discloses a cable with a flame retardant layer, the cable comprises an outer sheath and at least two mutually twisted leads arranged in the outer sheath, each lead comprises a conductor and a protection assembly, and the protection assembly is sleeved outside the conductor; the protection assembly is composed of a fireproof layer, a flame-retardant layer and an insulating layer which are sequentially arranged from inside to outside in a sleeved mode. A plurality of independent through grooves are formed in the flame-retardant layer, the through grooves are distributed in the flame-retardant layer at equal angles, and the through grooves are filled with fire extinguishing dry powder; the self-ignition process of the conductor can be further delayed through the designed flame-retardant layer in cooperation with the existing insulating layer and the fireproof layer, the use safety of the cable is improved, meanwhile, fire extinguishing dry powder filled in the flame-retardant layer can extinguish the self-ignition early stage of the cable, the flame-retardant effect is achieved, the use safety of the cable is further improved, and the service life of the cable is prolonged. And the defects of the existing cable in use are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of cables, and in particular relates to a cable with a flame retardant layer. Background Art

[0002] Cable is a device for transmitting electric energy or signals, usually composed of several or several groups of wires. Cables include power cables, control cables, compensation cables, shielded cables, high temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc. They are all composed of single or multiple wires and insulation layers, and are used to connect circuits, electrical appliances, etc.

[0003] During long-term operation, especially when under high load, the cable will generate a lot of heat. The heat-generating component in the cable is the metal conductor. Currently, the conductor basically adopts a copper structure. In order to avoid the problem of spontaneous combustion of copper conductors due to heat, an insulating layer, a fire-resistant layer, etc. are set on the outside of the conductor. However, this method can only delay the occurrence of spontaneous combustion. Once spontaneous combustion occurs, it cannot be prevented. Therefore, there are great limitations in actual use and there is room for improvement. Utility Model Content

[0004] The utility model aims to provide a cable with a flame retardant layer to solve the problem that the existing cables mentioned in the above background technology cannot achieve the flame retardant function.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cable with a flame retardant layer, the cable comprising an outer sheath, and at least two mutually twisted wires arranged in the outer sheath, each wire comprising a conductor, and a protective component, the protective component being sheathed on the outside of the conductor; the protective component is composed of a fire-resistant layer, a flame retardant layer, and an insulating layer sheathed in sequence from the inside to the outside;

[0006] A plurality of independent through grooves are formed inside the flame retardant layer. The through grooves are distributed at equal angles in the flame retardant layer, and fire extinguishing dry powder is filled in the through grooves.

[0007] Preferably, the through grooves are arranged along the axial spacing of the flame retardant layer, and the through grooves in the axial direction of the flame retardant layer are distributed in a spiral rotation, so that in a top view, the through grooves can achieve comprehensive coverage of various areas of the conductor, and extinguish open flames generated by the conductor at any position. At the same time, compared with this arrangement in which the through grooves are opened in the same shape as the cross-section of the flame retardant layer, the structure of the utility model can reduce the production cost and the dead weight of the flame retardant layer.

[0008] Preferably, a connecting layer is hot-melt bonded to the inner side of the flame retardant layer, and a sealed cavity is formed between the connecting layer and the through groove, wherein the fire extinguishing dry powder is placed in the cavity. During processing, the through groove on the flame retardant layer is first punched as a whole, and then the connecting layer is bonded to achieve connection.

[0009] Preferably, a refractory particle layer is sprayed on the outer surface of the refractory layer, and the thickness of the refractory particle layer is less than one third of the thickness of the refractory layer. The refractory performance of the refractory layer can be improved by providing the refractory particle layer.

[0010] Preferably, the volume of the fire extinguishing dry powder is less than three quarters of the volume of the sealed cavity to avoid excessive addition of dry powder and resulting in increased costs.

[0011] Preferably, an inner sheath is further provided inside the outer sheath, and the inner sheath is sleeved outside the mutually twisted wires, and there is a gap between the inner sheath and the wires, and the gap is filled with a filling part.

[0012] Preferably, a through hole is opened in the middle of the filling portion to reduce the deadweight of the entire cable, and the through hole is arranged in segments along the axial direction of the outer sheath.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The designed flame-retardant layer, in combination with the existing insulating layer and fire-resistant layer, can further delay the spontaneous combustion process of the conductor and improve the safety of cable use. At the same time, the fire-extinguishing dry powder filled in the flame-retardant layer can extinguish the spontaneous combustion of the cable in the early stage, thereby achieving a flame-retardant effect, further improving the safety of cable use, and improving the shortcomings of existing cables in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an end cross-sectional view of the utility model;

[0016] Figure 2 It is a cross-sectional view of a flame retardant layer of the utility model at one section;

[0017] Figure 3 It is a cross-sectional view of the flame retardant layer of the utility model at another section;

[0018] Figure 4 It is a cross-sectional view of the end position of the flame retardant layer of the utility model after being unfolded;

[0019] Figure 5 It is a cross-sectional view of the fire-resistant layer of the utility model.

[0020] In the figure: 101, outer sheath; 102, inner sheath; 103, insulating layer; 104, flame retardant layer; 104a, through groove; 104b, connecting layer; 105, fire-resistant layer; 105a, fire-resistant particle layer; 106, conductor; 107, filling part; 107a, through hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figures 1 to 5 The utility model provides a technical solution: a cable with a flame retardant layer, the cable comprising an outer sheath 101, and at least two mutually twisted wires arranged in the outer sheath 101, each wire comprising a conductor 106, and a protective component, the protective component is sleeved on the outside of the conductor 106; the protective component is composed of a fire-resistant layer 105, a flame retardant layer 104, and an insulating layer 103, which are sleeved in sequence from the inside to the outside;

[0023] A plurality of independent through grooves 104a are formed inside the flame retardant layer 104, and the through grooves 104a are distributed at equal angles in the flame retardant layer 104. Fire extinguishing dry powder is filled in the through grooves 104a. When the fire-resistant layer 105 spontaneously ignites due to the high temperature of the inner conductor 106 of the cable, the flame retardant layer 104 will be further burned. At this time, the fire extinguishing dry powder in the through grooves 104a is exposed, and the open flame is automatically extinguished. The fire extinguishing dry powder is made of fine particles made by mixing and grinding a fire extinguishing base material such as baking soda, ammonium carbonate, ammonium salt of phosphate, etc., and an appropriate amount of lubricant magnesium stearate, mica powder, talcum powder, etc., and a small amount of moisture-proof agent silica gel.

[0024] In this embodiment, preferably, the through grooves 104a are arranged along the axial spacing of the flame retardant layer 104, referring to Figure 2 and Figure 3 The through grooves 104a in the axial direction of the flame retardant layer 104 are distributed in a spiral rotation, so that in a top view, the through grooves 104a can fully cover various areas of the conductor 106, and extinguish the open flame generated by the conductor 106 at any position. At the same time, compared with this setting in which the through grooves 104a are opened in the same shape as the cross-section of the flame retardant layer 104, the structure of the utility model can reduce the production cost and the dead weight of the flame retardant layer 104.

[0025] In this embodiment, preferably, the inner side surface of the flame retardant layer 104 is hot-melt bonded with a connecting layer 104b, and a sealed cavity is formed between the connecting layer 104b and the through groove 104a, wherein the fire extinguishing dry powder is placed in the cavity. During processing, the through groove 104a on the flame retardant layer 104 is first stamped as an integral part, and then the connecting layer 104b is bonded to achieve connection.

[0026] In the present embodiment, preferably, a refractory granular layer 105a is formed by spraying on the outer surface of the refractory layer 105, and the thickness of the refractory granular layer 105a is less than one third of the thickness of the refractory layer 105. The refractory performance of the refractory layer 105 can be improved by setting the refractory granular layer 105a, and the refractory granular layer 105a includes the use of pearl cotton. This method of spraying to achieve fire resistance is a prior art. Specifically, reference may be made to a method for on-site spraying and filling of a refractory lightweight granular wall recorded in CN107435400A, which will not be further elaborated here.

[0027] In this embodiment, preferably, the volume of the fire extinguishing dry powder is less than three quarters of the volume of the sealed cavity to avoid excessive addition of dry powder and resulting in increased costs.

[0028] In this embodiment, preferably, an inner sheath 102 is further provided inside the outer sheath 101 , and the inner sheath 102 is sleeved outside the mutually twisted wires, and there is a gap between the inner sheath 102 and the wires, and the gap is filled with a filling portion 107 .

[0029] In this embodiment, preferably, a through hole 107 a is opened in the middle of the filling portion 107 to reduce the dead weight of the entire cable, and the through hole 107 a is arranged in segments along the axial direction of the outer sheath 101 .

[0030] Although the embodiments of the present invention have been shown and described (see the detailed description above for details), it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cable with a flame retardant layer, The cable comprises an outer sheath (101) and at least two mutually twisted conductors arranged in the outer sheath (101), and is characterized in that: Each lead includes A conductor (106), and a protective component, the protective component being sleeved on the outside of the conductor (106); the protective component being composed of a fire-resistant layer (105), a flame-retardant layer (104), and an insulating layer (103) being sleeved in sequence from the inside to the outside; A plurality of independent through grooves (104a) are formed inside the flame retardant layer (104), the through grooves (104a) are distributed at equal angles inside the flame retardant layer (104), and fire extinguishing dry powder is filled in the through grooves (104a).

2. The cable with a flame retardant layer according to claim 1, characterized in that: The through grooves (104a) are arranged at axial spacings along the flame retardant layer (104), and the through grooves (104a) in the axial direction of the flame retardant layer (104) are distributed in a spiral rotation.

3. The cable with a flame retardant layer according to claim 1, characterized in that: A connecting layer (104b) is hot-melt-bonded on the inner side of the flame-retardant layer (104), and a sealed cavity is formed between the connecting layer (104b) and the through groove (104a), wherein fire-extinguishing dry powder is placed in the cavity.

4. The cable with a flame retardant layer according to claim 1, characterized in that: The outer surface of the refractory layer (105) is sprayed to form a refractory particle layer (105a), the thickness of the refractory particle layer (105a) being less than one third of the thickness of the refractory layer (105). The provision of the refractory particle layer (105a) can improve the fire resistance of the refractory layer (105).

5. The cable with a flame retardant layer according to claim 3, characterized in that: The volume of the fire extinguishing dry powder is less than three quarters of the volume of the sealed cavity.

6. The cable with a flame retardant layer according to claim 1, characterized in that: An inner sheath (102) is also provided inside the outer sheath (101), and the inner sheath (102) is sleeved outside the mutually twisted wires, and there is a gap between the inner sheath (102) and the wires, and the gap is filled with a filling portion (107).

7. The cable with a flame retardant layer according to claim 6, characterized in that: A through hole (107a) is provided in the middle of the filling portion (107), and the through hole (107a) is arranged in sections along the axial direction of the outer sheath (101).

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