Signal cable with flame-retardant fireproof outer protection structure

Abstract

The utility model discloses a signal cable with a flame-retardant fireproof outer protection structure, which comprises a cable core, the cable core comprises a wire core and a filling layer, a belting layer is arranged outside the cable core, an inner sheath is arranged outside the belting layer, a composite flame-retardant fireproof layer is arranged outside the inner sheath, and the composite flame-retardant fireproof layer is arranged outside the composite flame-retardant fireproof layer. The wrapping tape layer, the inner sheath and the composite flame-retardant fireproof layer are formed through extrusion, an armor layer is arranged outside the composite flame-retardant fireproof layer, the armor layer and the composite flame-retardant fireproof layer are connected in an attached mode, an outer sheath is arranged outside the armor layer, the outer sheath and the armor layer are formed through extrusion, and the outer sheath and the composite flame-retardant fireproof layer are connected in an attached mode. The composite flame-retardant fireproof layer of the signal cable forms a hard ceramic shell when a fire disaster occurs, the inside of the cable is protected, the outer sheath adopts irradiation crosslinking polyethylene as a base material, the polyethylene is subjected to irradiation crosslinking treatment, the flame-retardant fireproof performance is greatly improved, the outside of the cable is protected, and the service life of the cable is prolonged. And the flame-retardant and fireproof effects of the signal cable are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of signal cables, in particular to a signal cable with a flame retardant and fireproof outer protective structure. Background Art

[0002] Signal cable is an important tool for signal transmission. It is a power connection line that transmits electric energy directly to various signal control devices from the distribution point in the signal system. It is a necessary line for information automation devices to transmit signals. It is widely used in various fields such as petrochemical, metallurgy, power generation, ships, railways, roads, subways, tunnels, aerospace, navigation, construction, and mining. In order to avoid signal interference, the signal cable has a shielding layer on the outside. The shielding layer of the shielded cable is generally conductive cloth, woven copper mesh or copper foil. The shielding layer needs to be grounded. External interference signals can be introduced into the ground by this layer to prevent interference signals from entering the inner conductor and reducing the loss of transmission signals.

[0003] The Chinese patent publication number is CN220085707U, and the authorization announcement date is November 24, 2023. A flame-retardant and fireproof railway digital signal cable includes a cable core and a sheath arranged on the outside of the cable core. The cable core is twisted by a flame-retardant filling rope and a plurality of star-twisted wires or twisted pairs. The sheath includes a stainless steel braided hose, an anti-corrosion coating, a flame-retardant coating, a braided insulation layer, a metal shielding layer, an inner lining layer, a steel wire braided layer, and an outer sheath arranged in sequence from the inside to the outside. The flame-retardant and fireproof railway digital signal cable provided by the utility model has a reasonable cable structure design, and the cable has excellent flame retardancy, fire resistance, moisture resistance, compression resistance, and animal bite resistance. At the same time, by arranging the steel wire winding layer between the inner layer hose and the outer layer hose, the cable's tensile strength, compression resistance, crack resistance, bending performance and mechanical strength can be greatly improved, which fully meets the requirements of high-speed railways for cables.

[0004] Although existing signal cables have certain flame retardant and fireproof capabilities, the flame retardant and fireproof structure is poor in effect when a fire occurs. The flame retardant and fireproof structure is easily destroyed and cannot protect the cable core, causing the signal cable to short-circuit, reducing the use effect of the signal cable and failing to meet the use requirements. Utility Model Content

[0005] The purpose of the utility model is to provide a signal cable with a flame retardant and fireproof outer protective structure to solve the problem in the above background technology that although the existing signal cables have certain flame retardant and fireproof capabilities, in the event of a fire, the flame retardant and fireproof structure has a poor effect and is easily damaged, and cannot protect the cable core, causing the signal cable to short-circuit, reducing the use effect of the signal cable, and failing to meet the use requirements.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a signal cable with a flame-retardant and fireproof outer sheath structure, comprising a cable core, the cable core comprising a wire core and a filling layer, a tape layer is arranged on the outside of the cable core, an inner sheath is arranged on the outside of the tape layer, a composite flame-retardant and fireproof layer is arranged on the outside of the inner sheath, and the tape layer, the inner sheath and the composite flame-retardant and fireproof layer are formed by extrusion, an armor layer is arranged on the outside of the composite flame-retardant and fireproof layer, and the armor layer is fitted and connected to the composite flame-retardant and fireproof layer, an outer sheath is arranged on the outside of the armor layer, and the outer sheath and the armor layer are formed by extrusion.

[0007] Preferably, the wire core includes a conductor, an insulating layer, a shielding layer and a PVC plastic layer, the conductor is formed by twisting a plurality of metal wires, the insulating layer is arranged outside the conductor, the shielding layer is arranged outside the insulating layer, the PVC plastic layer is arranged outside the shielding layer, and the conductor, the insulating layer, the shielding layer and the PVC plastic layer are formed by extrusion.

[0008] Preferably, the composite flame retardant and fireproof layer comprises a ceramic silicone rubber layer and a polyvinyl chloride layer, the ceramic silicone rubber layer is arranged outside the polyvinyl chloride layer, and the ceramic silicone rubber layer and the polyvinyl chloride layer are arranged as one body.

[0009] Preferably, the outer sheath comprises a radiation cross-linked polyethylene layer and a fire retardant coating layer, the fire retardant coating layer is arranged on the outer surface of the radiation cross-linked polyethylene layer, and the fire retardant coating layer and the radiation cross-linked polyethylene layer are arranged as a whole.

[0010] Preferably, the filling layer is arranged at the gap of the wire core, and the filling layer is made of fireproof mud.

[0011] Preferably, the wrapping layer is woven with fireproof glass ribbon and flame-retardant glass ribbon, and the wrapping layer is spirally wrapped around the outside of the cable core.

[0012] Preferably, the polyvinyl chloride layer is made of flame-retardant polyvinyl chloride with a high oxygen index, and the fire-retardant coating layer is made of solvent-based fire-retardant coating.

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

[0014] 1. The utility model device is provided with a composite flame retardant fireproof layer, which is a double-layer structure composed of a ceramic silicone rubber layer and a polyvinyl chloride layer. The ceramic silicone rubber layer has excellent fireproof, flame retardant, low smoke, non-toxic and other characteristics. The residue after combustion is a hard ceramic shell, which does not melt or drip in a fire environment. It also has excellent oxygen and heat insulation effects, and can effectively isolate the high-temperature flame from invading the inside of the line, delay the decomposition of internal materials, and avoid the conductor from melting in the flame, so as to ensure the normal use of the cable in the event of a fire. The polyvinyl chloride layer adopts a flame retardant polyvinyl chloride with a high oxygen index, and the fire retardant coating layer adopts a solvent-based fire retardant coating. The flame retardant polyvinyl chloride with a high oxygen index enables the cable to increase its current carrying capacity and flame retardant performance at the same external ambient temperature, thereby improving the flame retardant and fireproof effect of the signal cable.

[0015] 2. The utility model device is provided with an outer sheath, and the outer sheath is a double-layer structure consisting of a radiation cross-linked polyethylene layer and a fire retardant coating layer. The radiation cross-linked polyethylene layer is produced by irradiation to generate polymer free radicals, and then these polymer free radicals combine with each other to form cross-linking bonds, thereby changing the polymer from a linear polymer structure to a three-dimensional network macromolecular structure. The flame retardant, aging resistance and insulation properties are improved several times, and can withstand 8000 hours of testing at 110°C. The solvent-based fire retardant coating expands to produce a foam layer when encountering fire, and carbonizes into a protective layer to isolate the fire source and improve the use effect of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a cross-sectional view of the utility model;

[0018] Figure 3 For the utility model Figure 2 A partial enlarged view of area A;

[0019] Figure 4 This is a structural diagram of the composite flame retardant fireproof layer of the utility model;

[0020] Figure 5 This is a structural diagram of the outer sheath of the present utility model.

[0021] In the figure: 1. Cable core; 2. Wire core; 3. Filling layer; 4. Tape layer; 5. Inner sheath; 6. Composite flame retardant and fireproof layer; 7. Armor layer; 8. Outer sheath; 9. Conductor; 10. Insulation layer; 11. Shielding layer; 12. PVC plastic layer; 13. Ceramic silicone rubber layer; 14. Polyvinyl chloride layer; 15. Irradiation cross-linked polyethylene layer; 16. Fire retardant coating layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] See also Figure 1-5 The utility model provides an embodiment: a signal cable with a flame retardant and fireproof outer sheath structure, including a cable core 1, the cable core 1 includes a wire core 2 and a filling layer 3, a tape layer 4 is arranged outside the cable core 1, an inner sheath 5 is arranged outside the tape layer 4, a composite flame retardant and fireproof layer 6 is arranged outside the inner sheath 5, and the tape layer 4, the inner sheath 5 and the composite flame retardant and fireproof layer 6 are formed by extrusion, an armor layer 7 is arranged outside the composite flame retardant and fireproof layer 6, and the armor layer 7 is fitted and connected to the composite flame retardant and fireproof layer 6, an outer sheath 8 is arranged outside the armor layer 7, and the outer sheath 8 and the armor layer 7 are formed by extrusion.

[0024] See also Figure 1 , Figure 2 and Figure 3 The core 2 includes a conductor 9, an insulating layer 10, a shielding layer 11 and a PVC plastic layer 12. The conductor 9 is formed by twisting a plurality of metal wires. The insulating layer 10 is arranged on the outside of the conductor 9, the shielding layer 11 is arranged on the outside of the insulating layer 10, and the PVC plastic layer 12 is arranged on the outside of the shielding layer 11. The conductor 9, the insulating layer 10, the shielding layer 11 and the PVC plastic layer 12 are formed by extrusion. The insulating layer 10, the shielding layer 11 and the PVC plastic layer 12 are sequentially wrapped around the outside of the conductor 9, so that the core 2 has insulation and shielding properties. The PVC plastic layer 12 increases the flame retardant and fireproof effect of the core 2, thereby improving the use effect of the core 2.

[0025] See also Figure 1 and Figure 4 The composite flame retardant and fireproof layer 6 includes a ceramic silicone rubber layer 13 and a polyvinyl chloride layer 14. The ceramic silicone rubber layer 13 is arranged on the outside of the polyvinyl chloride layer 14, and the ceramic silicone rubber layer 13 and the polyvinyl chloride layer 14 are arranged as a whole. The ceramic silicone rubber layer 13 and the polyvinyl chloride layer 14 form a double-layer structure. The ceramic silicone rubber layer 13 has excellent fire prevention, flame retardancy, low smoke, non-toxic and other characteristics. The residue after combustion is a hard ceramic shell. The hard shell does not melt or drip in a fire environment. It also has excellent oxygen and heat insulation effects, which can effectively isolate the high-temperature flame from invading the inside of the line, delay the decomposition of internal materials, and avoid the conductor 9 from melting in the flame, thereby ensuring the normal use of the cable under fire conditions.

[0026] See also Figure 1 and Figure 5The outer sheath 8 includes a radiation cross-linked polyethylene layer 15 and a fire retardant coating layer 16. The fire retardant coating layer 16 is arranged on the outer surface of the radiation cross-linked polyethylene layer 15, and the fire retardant coating layer 16 is arranged as a whole with the radiation cross-linked polyethylene layer 15. The radiation cross-linked polyethylene layer 15 and the fire retardant coating layer 16 form a double-layer structure. The radiation cross-linked polyethylene layer 15 generates polymer free radicals by radiation, and then these polymer free radicals combine with each other to form cross-linking bonds, so that the polymer changes from a linear polymer structure to a three-dimensional network macromolecular structure, and the flame retardant, aging resistance and insulation properties are improved several times, and can withstand 8000 hours of testing at 110°C. The fire retardant coating layer 16 is arranged on the outer surface of the outer sheath 8 to further increase the fireproof effect of the cable.

[0027] See also Figure 1 and Figure 2 The filling layer 3 is arranged in the gap of the wire core 2, and the filling layer 3 adopts fireproof mud. The fireproof mud is filled in the gap of the wire core 2. When the cable burns, the fireproof mud decomposes by heat to generate corresponding oxides and water. The release of water will reduce the temperature of the cable, thereby reducing the damage of the flame to the cable core.

[0028] See also Figure 1 The tape layer 4 is woven with fireproof glass ribbon and flame-retardant glass ribbon, and the tape layer 4 is spirally wrapped around the outside of the cable core 1. The tape layer 4 is wrapped around the outside of the cable core 1, which can form a flame-retardant and fire-proof effect on the outside of the cable core 1, further improving the use effect of the cable.

[0029] See also Figure 1 and Figure 4 The polyvinyl chloride layer 14 adopts flame-retardant polyvinyl chloride with a high oxygen index, and the fire-retardant coating layer 16 adopts solvent-based fire-retardant coating. The flame-retardant polyvinyl chloride with a high oxygen index allows the cable to improve its current carrying capacity and flame retardant performance at the same external ambient temperature, while increasing the cable's cycle load current carrying capacity, the cable's short-term overload current carrying capacity and the cable's allowable short-circuit current. The solvent-based fire-retardant coating expands to produce a foam layer when exposed to fire, and carbonizes into a protective layer to isolate the fire source and improve the use effect of the cable.

[0030] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0031] Although embodiments of the present invention 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 invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A signal cable with a flame retardant and fireproof outer sheath structure, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a filling layer (3); a tape layer (4) is arranged outside the cable core (1); an inner sheath (5) is arranged outside the tape layer (4); a composite flame retardant and fireproof layer (6) is arranged outside the inner sheath (5); the tape layer (4), the inner sheath (5) and the composite flame retardant and fireproof layer (6) are formed by extrusion; an armor layer (7) is arranged outside the composite flame retardant and fireproof layer (6); the armor layer (7) is connected to the composite flame retardant and fireproof layer (6); an outer sheath (8) is arranged outside the armor layer (7); the outer sheath (8) and the armor layer (7) are formed by extrusion.

2. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 1, characterized in that: The wire core (2) comprises a conductor (9), an insulating layer (10), a shielding layer (11) and a PVC plastic layer (12); the conductor (9) is formed by twisting a plurality of metal wires; the insulating layer (10) is arranged outside the conductor (9); the shielding layer (11) is arranged outside the insulating layer (10); the PVC plastic layer (12) is arranged outside the shielding layer (11); and the conductor (9), the insulating layer (10), the shielding layer (11) and the PVC plastic layer (12) are formed by extrusion.

3. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 1, characterized in that: The composite flame retardant and fireproof layer (6) comprises a ceramic silicone rubber layer (13) and a polyvinyl chloride layer (14); the ceramic silicone rubber layer (13) is arranged outside the polyvinyl chloride layer (14), and the ceramic silicone rubber layer (13) and the polyvinyl chloride layer (14) are arranged as a whole.

4. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 3, characterized in that: The outer sheath (8) comprises a radiation cross-linked polyethylene layer (15) and a fire retardant coating layer (16); the fire retardant coating layer (16) is arranged on the outer surface of the radiation cross-linked polyethylene layer (15), and the fire retardant coating layer (16) and the radiation cross-linked polyethylene layer (15) are arranged as a whole.

5. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 1, characterized in that: The filling layer (3) is arranged at the gap of the wire core (2), and the filling layer (3) is made of fireproof mud.

6. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 1, characterized in that: The tape layer (4) is woven with fireproof glass ribbons and flame-retardant glass ribbons, and the tape layer (4) is spirally wrapped around the outside of the cable core (1).

7. The signal cable with a flame retardant and fireproof outer sheath structure according to claim 4, characterized in that: The polyvinyl chloride layer (14) is made of flame-retardant polyvinyl chloride with a high oxygen index, and the fire-retardant coating layer (16) is made of solvent-based fire-retardant coating.

Images