A flame retardant wire and cable with a protective structure

Abstract

The present invention discloses a wire and cable with a good flame retardant effect with a protective structure, comprising an inner protective layer, an armor layer, and an outer protective layer arranged in sequence from the inside to the outside, a cable assembly being arranged inside the inner protective layer, a flame retardant cavity being formed between the armor layer and the outer protective layer, a flame retardant unit being arranged in the flame retardant cavity, the flame retardant unit comprising a double-layer hollow tube sheathed on the outer wall of the armor layer, a corrugated support mesh being installed on the outer wall of the double-layer hollow tube, and flame retardant fillers being arranged on the inner sides of the corrugated support mesh and the connecting mesh. The present invention limits the flame retardant fillers on the inner sides of the corrugated support mesh and the connecting mesh by arranging the corrugated support mesh and the connecting mesh to prevent the flame retardant fillers from sliding downwards, transmits air or heat through the connecting pipe, causes the thermal expansion fillers to begin to expand and push the elastic extrusion membrane to expand outwards, thereby pushing the supplementary fillers out through the extrusion port, causing the supplementary fillers to enter the inner sides of the corrugated support mesh and the connecting mesh, thereby achieving the purpose of automatic replenishment of the flame retardant fillers, and is conducive to improving the flame retardant performance of the wire and cable.

Description

Technical Field

[0001] The present invention relates to the technical field of electric wires and cables, in particular to an electric wire and cable with a protective structure and good flame retardant effect. Background Art

[0002] Cables are wires with insulation and a protective sheath, consisting of multiple insulated strands. They are primarily used for power and electrical transmission. However, sudden disasters, such as fires, can paralyze circuit systems, leading to the collapse of entire power grids. Due to the extensive damage, subsequent repairs are time-consuming and labor-intensive, making it difficult for people to access electricity. Therefore, flame-retardant wires and cables are required. However, current flame-retardant cables are flame-retardant by filling the inner layer with flame-retardant fillers or coating them with flame-retardant layers. When the outer protective layer burns, the filler tends to slide downward, reducing the flame-retardant effect at the damaged area. Furthermore, when the filler or layer is depleted, it is difficult to replenish the filler, further reducing the flame-retardant effect of the cable.

[0003] The defects of existing wires and cables are:

[0004] 1. Patent document US09502871B2 mainly improves the anti-interference performance of the cable by adding an external braided shielding layer, but does not consider how to improve the flame retardant performance of the cable;

[0005] 2. Patent document CN111312441B mainly improves the high temperature resistance and heat insulation capacity of the cable by setting the first filling layer and the second filling layer, but does not consider how to improve the compression resistance and bending deformation resistance of the wire and cable;

[0006] 3. Patent document US20150287499A1 mainly reduces magnetic flux leakage and limits the increase of high-frequency resistance by providing magnetic shielding, but does not consider how to avoid mutual compression between multiple groups of cable cores and avoid cable core displacement;

[0007] 4. Patent document CN118352120B mainly considers the problem of protecting long cables from the outside by setting up protective components and how to facilitate the replacement of protective components. However, it does not consider the problem that when the existing long cable fails, it is difficult to locate the fault point. Summary of the Invention

[0008] The object of the present invention is to provide a wire and cable with a protective structure and good flame retardant effect, so as to solve the problems raised in the above background technology.

[0009] To achieve the above objectives, the present invention provides the following technical solutions: a wire and cable with a protective structure and good flame retardant effect, comprising an inner protective layer, an armor layer, and an outer protective layer arranged in sequence from the inside to the outside, the outer wall of the inner protective layer being in contact with the inner wall of the armor layer, a cable assembly being arranged inside the inner protective layer, a flame retardant cavity being formed between the armor layer and the outer protective layer, a flame retardant unit being arranged in the flame retardant cavity, the flame retardant unit being used to provide flame retardant protection for the cable assembly;

[0010] The flame retardant unit includes a double-layer hollow tube sleeved on the outer wall of the armor layer, the outer wall of the double-layer hollow tube is installed with a corrugated support net, and the convex side outer wall of the corrugated support net is connected to the inner wall of the outer protective layer, and a connecting net is provided between the outer walls of adjacent corrugated support nets on one side close to each other, and the connecting net is close to the inner wall of the outer protective layer, and the inner sides of the corrugated support net and the connecting net are both provided with flame retardant fillers;

[0011] The inner wall of the double-layer hollow tube is equipped with multiple groups of support bars at equal intervals, and an elastic extrusion membrane is installed on the outer wall on the side where the two groups of support bars are close to each other. An extrusion port is opened on the outer wall of the double-layer hollow tube, and a connecting tube is installed through the outer wall of the double-layer hollow tube, and the bottom end of the connecting tube passes through the elastic extrusion membrane and extends to the inner side of the elastic extrusion membrane. A sealing film is attached to the outer wall of the double-layer hollow tube, and the sealing film seals the extrusion port and the top end of the connecting tube. A supplementary filler is filled between the outer side of the elastic extrusion membrane and the interior of the hollow elastic tube, and an expansion filler is filled between the inner side of the elastic extrusion membrane and the interior of the hollow elastic tube.

[0012] Preferably, the supplementary filler is a flame retardant filler.

[0013] Preferably, the expandable filler is dry ice or heat-expandable microspheres.

[0014] Preferably, the cable assembly includes a hollow elastic tube located inside the inner protective layer, and the hollow elastic tube is coaxially arranged with the inner protective layer, support seats are arranged at equal intervals on the outer wall of the hollow elastic tube, a protective assembly is arranged between the support seat and the inner wall of the inner protective layer, a cable core is arranged inside the protective assembly, the outer wall of the cable core is covered with an insulating layer, and the insulating layer is located inside the protective assembly.

[0015] Preferably, the protective assembly includes a lower protective shell fixedly connected to the arc-shaped inner wall of the support frame, the outer wall of the lower protective shell is slidably connected to the upper protective shell, and the upper protective shell is located above the lower protective shell, the outer wall of the upper protective shell is connected to the inner wall of the inner protective layer, the top wall of the upper protective shell and the bottom wall of the lower protective shell are symmetrically provided with fixed seats about the axial direction of the insulating layer, the outer wall of the insulating layer is symmetrically provided with a guide frame, the guide frame is located between the insulating layer and the fixed seat, the inner wall of the guide frame is slidably provided with a cylindrical bar, and the outer wall of the cylindrical bar is slidably connected to the outer wall of the insulating layer, the outer wall of the cylindrical bar is provided with a connecting bar, the connecting bar is used to connect two adjacent groups of cylindrical bars, the ends of the two groups of connecting bars close to each other are rotatably connected to a rotating bar, and the end of the rotating bar away from the insulating layer is rotatably connected to the outer wall of the fixed seat.

[0016] Preferably, the lower protective shell and the upper protective shell are both semi-cylindrical, the axial direction of the cylindrical strip is parallel to the axial direction of the insulating layer, and the guide frames are distributed at equal intervals along the axial direction of the insulating layer.

[0017] Preferably, an elastic support shell is installed inside the inner protective layer, and the elastic support shell is located outside the upper protective shell, the support seat passes through the inside of the elastic support shell, and a buffer filler is provided between the inside of the inner protective layer and the outside of the elastic support shell.

[0018] Preferably, the outer wall of the cable core is provided with connecting rings at equal intervals, and the connecting rings are located inside the insulating layer, an inner tube is coaxially arranged inside the hollow elastic tube, a dividing strip is installed on the outer wall of the inner tube, and the outer wall of the dividing strip away from the inner tube is connected to the inner wall of the hollow elastic tube, an indicator light is installed on the inner wall of the hollow elastic tube, the indicator light is electrically connected to the connecting ring through a wire, a photoelectric sensor is installed on the outer wall of the inner tube, and the photoelectric sensor and the indicator light are arranged correspondingly, a wireless transmission module and a positioning module are installed inside the hollow tube, and the positioning module, the photoelectric sensor, the indicator light and the wireless transmission module are electrically connected.

[0019] Preferably, the number of installation groups of the separators and the cable cores is the same.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention is equipped with a flame retardant unit, including limiting the flame retardant filler on its inner side through a corrugated support net and a connecting net, so as to prevent the flame retardant filler from sliding downwards and being difficult to flame retard the damaged part after the outer protective layer is burned and damaged, which is beneficial to improving the flame retardant effect. After the flame retardant filler on the outer side of the double-layer hollow tube is exhausted, the extrusion port and the connecting pipe are leaked out, and air or heat is transmitted through the connecting pipe, so that the thermal expansion filler begins to expand and pushes the elastic extrusion membrane to expand outward, thereby pushing the supplementary filler to be squeezed out through the extrusion port, so that the supplementary filler enters the inner side of the corrugated support net and the connecting net, thereby achieving the purpose of automatic replenishment of the flame retardant filler, and is beneficial to improving the flame retardant performance of the wire and cable.

[0022] 2. The present invention supports the lower protective shell by arranging a support seat, thereby ensuring the relative positions between multiple groups of cable cores and avoiding mutual extrusion between the cable cores. A deformable space is formed between the upper protective shell, the lower protective shell and the insulating layer. When the wires and cables are squeezed or bent downward, the upper protective shell slides downward along the outer wall of the lower protective shell, thereby reducing the degree of bending deformation of the cable core and achieving the purpose of protecting the cable core. By arranging a movable cylindrical bar, the force is evenly distributed on the insulating layer, avoiding the concentration of force and causing damage to the cable core, which is beneficial to improving the extrusion resistance and bendability of the wires and cables, and is beneficial to extending the service life of the cable.

[0023] 3. The present invention fills the inner protective layer with a buffer filler, which is beneficial to maintaining the shape of the cable and reducing the possibility of the cable being deformed by being squeezed. By providing an elastic support shell, the buffer filler is prevented from fixing the upper protective shell and the lower protective shell, thereby ensuring the deformation space of the upper protective shell and the lower protective shell. At the same time, the inner protective layer is further supported by the elastic support frame, thereby further improving the cable's anti-deformation performance.

[0024] 4. The present invention divides long-distance wires and cables into multiple groups of detectable areas by arranging multiple groups of connecting rings at equal intervals along the axial direction of the cable core. When a cable in a group of detectable areas fails, the closed loop in the faulty area is disconnected, so that the indicator light at the corresponding position goes out, and the detection value obtained by the photoelectric sensor is lower than the detection value in the on state, so that the wires and cables have a self-detection function and are easy to obtain the fault area, thereby reducing the difficulty of maintenance. By arranging the indicator light and photoelectric sensor corresponding to the cable core, it is easy to locate the faulty cable core, further reducing the difficulty of maintenance, and helping to speed up the maintenance efficiency of the wires and cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the cross-sectional structure of the flame retardant cavity of the present invention;

[0027] Figure 3 For the present invention Figure 2 A schematic diagram of the enlarged structure of the flame retardant unit at A;

[0028] Figure 4 This is a schematic diagram of the structure of the protection component of the present invention;

[0029] Figure 5 This is a schematic diagram of the cross-sectional structure of the upper protective shell of the present invention;

[0030] Figure 6 This is a schematic diagram of the elastic support shell structure of the present invention;

[0031] Figure 7 Schematic diagram of the hollow elastic tube structure of the present invention;

[0032] Figure 8 It is a schematic diagram of the inner tube structure of the present invention.

[0033] In the figure: 1. Inner protective layer; 2. Armor layer; 3. Outer protective layer; 4. Flame retardant cavity; 5. Cable assembly; 6. Double-layer hollow tube; 7. Support bar; 8. Corrugated support net; 9. Connecting net; 10. Flame retardant filler; 11. Extrusion port; 12. Sealing film; 13. Connecting pipe; 14. Elastic extrusion membrane; 15. Supplementary filler; 16. Hollow elastic tube; 17. Support seat; 18. Lower protective shell; 19. Upper protective shell; 20. Fixed seat; 21. Cable core; 22. Insulation layer; 23. Guide frame; 24. Cylindrical bar; 25. Connecting bar; 26. Rotating bar; 27. Elastic support shell; 28. Buffer filler; 29. ​​Connecting ring; 30. Inner tube; 31. Separating bar; 32. Indicator light; 33. Photoelectric sensor; 34. Wireless transmission module; 35. Positioning module. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," "the other end," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] See also Figure 1 、 Figure 2 and Figure 3 , an embodiment of the present invention provides: a wire and cable with a good flame retardant effect with a protective structure, comprising an inner protective layer 1, an armor layer 2 and an outer protective layer 3 arranged in sequence from the inside to the outside, wherein the inner protective layer 1 is a cross-linked polyethylene layer, the outer protective layer 3 is a wear-resistant rubber layer, the outer wall of the inner protective layer 1 is in contact with the inner wall of the armor layer 2, a cable assembly 5 is arranged inside the inner protective layer 1, a flame retardant cavity 4 is formed between the armor layer 2 and the outer protective layer 3, a flame retardant unit is arranged in the flame retardant cavity 4, the flame retardant unit is used to provide flame retardant protection for the cable assembly 5, the flame retardant unit comprises a double-layer hollow tube 6 sleeved on the outer wall of the armor layer 2, and the outer wall of the double-layer hollow tube 6 does not contact the outer protective layer The inner wall of the layer 3 is fitted, and the outer wall of the double-layer hollow tube 6 is installed with a corrugated support net 8, and the outer wall of the convex side of the corrugated support net 8 is connected to the inner wall of the outer protective layer 3. The corrugated support net 8 provides support for the outer protective layer 3, which is beneficial to improve the anti-extrusion performance of the wires and cables. A connecting net 9 is provided between the outer walls of the adjacent corrugated support nets 8 on one side close to each other, and the connecting net 9 is close to the inner wall of the outer protective layer 3. The inner sides of the corrugated support net 8 and the connecting net 9 are both provided with flame retardant fillers 10, and the flame retardant fillers 10 are magnesium hydroxide or aluminum hydroxide fillers. Multiple groups of support bars 7 are installed at equal intervals on the inner wall of the double-layer hollow tube 6, and the support bars 7 provide support for the double-layer hollow tube 6 from the inside. The outer wall of the double-layer hollow tube 6 is provided with an extrusion port 11, which is evenly distributed on the inner side of the corrugated support mesh 8 and the connecting mesh 9. A connecting pipe 13 is installed through the outer wall of the double-layer hollow tube 6, and the bottom end of the connecting pipe 13 passes through the elastic extrusion membrane 14 and extends to the elastic extrusion membrane 14. On the inner side of the pressing film 14, there are multiple groups of extrusion ports 11 and a group of connecting tubes 13 distributed between two adjacent groups of support bars 7. The outer wall of the double-layer hollow tube 6 is attached with a sealing film 12, and the sealing film 12 seals the top of the extrusion port 11 and the connecting tube 13. The sealing film 12 is a flammable sealing film 12. The storage space between the outer side of the elastic extrusion film 14 and the inside of the hollow elastic tube 16, that is, the upper half is filled with a supplementary filler 15, and the supplementary filler 15 is a flame retardant filler 10. The storage space between the inner side of the elastic extrusion film 14 and the inside of the hollow elastic tube 16, that is, the lower half is filled with an expansion filler, which is dry ice or thermal expansion microspheres.

[0038] Furthermore, by setting the corrugated support net 8 and the connecting net 9 to limit the flame retardant filler 10 on its inner side, it is prevented that after the outer protective layer 3 is burned and damaged, the flame retardant filler 10 slides downward and becomes difficult to flame retard the damaged part, which is beneficial to improving the flame retardant effect. If there is still a fire after the flame retardant filler 10 on the inner side of the corrugated support net 8 and the connecting net 9 is exhausted, the sealing film 12 on the outer wall of the double-layer hollow tube 6 is burned, and the extrusion port 11 and the top end of the connecting pipe 13 are leaked, and air is transmitted to the storage space in the lower half through the connecting pipe 13, so that the dry ice in the storage space in the lower half is diffused, and carbon dioxide gas is generated to drive the elastic extrusion die. Move upward, and extrude the supplementary filler 15 in the upper storage space from the extrusion port 11, so as to achieve the purpose of automatically replenishing the flame retardant filler 10, which is beneficial to improving the flame retardant effect, and the carbon dioxide gas diffuses outward through the connecting pipe 13, suppressing the fire, and improving the flame retardant effect to a certain extent. Or after the sealing film 12 is burned, heat is directly transferred to the lower storage space through the connecting pipe 13, so that the heat-expandable microspheres expand due to heat, and push the elastic extrusion die to extrude the supplementary filler 15 upward, so that the supplementary filler 15 enters the inner side of the corrugated support net 8 and the connecting net 9, so as to achieve the purpose of automatically replenishing the flame retardant filler 10, which is beneficial to improving the flame retardant performance of wires and cables.

[0039] See also Figure 4 and Figure 5, an embodiment of the present invention provides: a wire and cable with a good flame retardant effect with a protective structure, the cable assembly 5 includes a hollow elastic tube 16 located inside the inner protective layer 1, and the hollow elastic tube 16 is coaxially arranged with the inner protective layer 1, the outer wall of the hollow elastic tube 16 is provided with support seats 17 at equal intervals, the side of the support seat 17 away from the hollow elastic tube 16 is arc-shaped, a protective assembly is provided between the support seat 17 and the inner wall of the inner protective layer 1, a cable core 21 is provided inside the protective assembly, the outer wall of the cable core 21 is covered with an insulating layer 22, and the insulating layer 22 is located inside the protective assembly, the insulating layer 22 is used to provide protection for the cable core 21, the protective assembly includes a lower protective shell 18 fixedly connected to the arc-shaped inner wall of the support frame, the outer wall of the lower protective shell 18 is slidably connected to the upper protective shell 19, and the upper protective shell 19 is located above the lower protective shell 18, the outer wall of the upper protective shell 19 is connected to the inner wall of the inner protective layer 1, the lower protective shell 18 and the upper protective shell 19 are both semi-cylindrical, the lower protective shell 1 8 and the upper protective shell 19 seal the cable core 21 and the insulating layer 22. The top wall of the upper protective shell 19 and the bottom wall of the lower protective shell 18 are symmetrically provided with a fixing seat 20 about the axis direction of the insulating layer 22. The outer wall of the insulating layer 22 is symmetrically provided with a guide frame 23. The guide frame 23 is located between the insulating layer 22 and the fixing seat 20. The guide frame 23 is distributed at equal intervals along the axis direction of the insulating layer 22. The inner wall of the guide frame 23 is slidably provided with a cylindrical bar 24. The axis direction of the cylindrical bar 24 is symmetrical with respect to the insulating layer 22. The cylindrical bar 24 is parallel to the axial direction of the insulating layer 22, and the outer wall of the cylindrical bar 24 is slidably connected to the outer wall of the insulating layer 22. The outer wall of the cylindrical bar 24 is provided with a connecting bar 25. The connecting bar 25 is used to connect two adjacent groups of cylindrical bars 24. The connecting bar 25 is arc-shaped, and the connecting bar 25 is coaxially arranged with the insulating layer 22 and the cable core 21. The ends of the two groups of connecting bars 25 that are close to each other are rotatably connected to the rotating bar 26, and the end of the rotating bar 26 away from the insulating layer 22 is rotatably connected to the outer wall of the fixed seat 20.

[0040] Furthermore, the cables and the insulating layer 22 are further protected by the upper protective shell 19 and the lower protective shell 18. The lower protective shell 18 is supported by the support seat 17, thereby ensuring the relative positions of the multiple groups of cable cores 21 and avoiding mutual extrusion between the cable cores 21. A deformable space is formed between the upper protective shell 19 and the lower protective shell 18 and the insulating layer 22. When the wires and cables are squeezed or bent downward, the upper protective shell 19 slides downward along the outer wall of the lower protective shell 18, thereby reducing the degree of bending deformation of the cable core 21 and achieving the purpose of protecting the cable core 21. When the upper protective shell 19 moves downward, it drives the upper fixed seat 20 to move downward, and the fixed seat 20 drives the rotating bar 26 to rotate, so that the rotating bar 26 pushes the cylindrical bar 24 to slide downward along the outer wall of the insulating layer 22, so that the force is evenly distributed on the insulating layer 22, avoiding the concentration of force and causing damage to the cable core 21, which is beneficial to improving the extrusion resistance and bendability of the wires and cables, and is beneficial to extending the service life of the cable.

[0041] See also Figure 6 The present invention provides an embodiment: a wire and cable with a good flame retardant effect with a protective structure, comprising an inner protective layer 1 with an elastic support shell 27 installed inside, and the elastic support shell 27 is located outside the upper protective shell 19, and the support seat 17 passes through the inside of the elastic support shell 27, and a buffer filler 28 is provided between the inside of the inner protective layer 1 and the outside of the elastic support shell 27. By filling the buffer filler 28 inside the inner protective layer 1, it is beneficial to maintain the shape of the cable and reduce the possibility of deformation of the cable due to extrusion. By providing the elastic support shell 27, the buffer filler 28 is avoided from fixing the upper protective shell 19 and the lower protective shell 18, thereby ensuring the deformation space of the upper protective layer and the lower protective layer. At the same time, the inner protective layer 1 is further supported by the elastic support frame, thereby further improving the anti-deformation performance of the cable.

[0042] See also Figure 7 and Figure 8 , the present invention provides an embodiment: a wire and cable with a good flame retardant effect with a protective structure, comprising: a cable core 21 having an outer wall provided with connecting rings 29 at equal intervals, the connecting rings 29 being made of conductive material and being located inside the insulating layer 22, an inner tube 30 being coaxially arranged inside the hollow elastic tube 16, a dividing strip 31 being installed on the outer wall of the inner tube 30, and the outer wall of the dividing strip 31 on the side away from the inner tube 30 being connected to the inner wall of the hollow elastic tube 16, the number of installation groups of the dividing strip 31 and the cable core 21 being the same, an indicator light 32 being installed on the inner wall of the hollow elastic tube 16, the indicator light 32 being electrically connected to the connecting ring 29 through a wire, a photoelectric sensor 33 being installed on the outer wall of the inner tube 30, and the photoelectric sensor 33 being arranged corresponding to the indicator light 32, a wireless transmission module 34 and a positioning module 35 being installed inside the hollow tube, the positioning module 35, the photoelectric sensor 33, the indicator light 32 and the wireless transmission module 34 being electrically connected.

[0043] Furthermore, by setting multiple groups of connecting rings 29 at equal intervals along the axial direction of the cable core 21, long-distance wires and cables are divided into multiple groups of detectable areas. Through the connecting rings 29 and the conductors, a closed loop is formed between the cable core 21, the connecting rings 29, the conductors and the indicator lights 32 at the corresponding positions between the two groups of connecting rings 29. When a fault occurs in the wire and cable, the closed loop in the fault area is disconnected, so that the indicator light 32 at the corresponding position goes out, and the detection value obtained by the photoelectric sensor 33 is lower than the detection value in the on state. The detection result and the position information of the positioning module 35 are transmitted to the cable management party through the wireless transmission module 34, so that the wire and cable have a self-detection function, and the position where the first group of indicator lights 32 goes out is obtained according to the positioning module 35, so as to facilitate the acquisition of the fault area, thereby reducing the difficulty of maintenance, and by setting the indicator light 32 and the photoelectric sensor 33 corresponding to the cable core 21, it is convenient to locate the faulty cable core 21, further reducing the difficulty of maintenance, which is conducive to speeding up the maintenance efficiency of the wire and cable.

[0044] Working principle: The wire and cable include a cable assembly 5, an inner protective layer 1, an armor layer 2 and an outer protective layer 3 arranged from the inside to the outside. The outer protective layer 3 is conducive to improving the wear resistance of the wire and cable, thereby reducing the wear of the cable. A flame retardant unit is set in the flame retardant cavity 4 between the armor layer 2 and the outer protective layer 3, and the flame retardant performance of the cable is improved by filling it with flame retardant filler 10. The flame retardant filler 10 is limited by setting a corrugated support net 8 and a connecting net 9 to prevent the flame retardant filler 10 from sliding downward, and by setting a supplementary filler 15, after the flame retardant filler 10 on the outside is used up, the flame retardant filler 10 is automatically supplemented to the outside, which is conducive to maintaining the flame retardant performance of the cable. By setting a hollow elastic The flexible tube 16 and the support seat 17 support the cable core 21, which is beneficial to maintaining the relative positions between multiple groups of cable cores 21 and avoiding mutual extrusion between the cable cores 21. The protective component arranged on the outside of the cable core 21 protects the internal cable core 21, and at the same time reserves a deformable space. When the outside of the outer protective layer 3 is squeezed or bent, the deformation degree of the cable core 21 is reduced, and multiple groups of cylindrical bars 24 sliding along the outer wall of the insulating layer 22 are arranged to evenly distribute the force on the insulating layer 22, avoiding the concentration of force and causing damage to the cable core 21, which is beneficial to improving the extrusion resistance and bendability of wires and cables, and is beneficial to extending the service life of the cable.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A flame retardant wire and cable with a protective structure, characterized by: The invention comprises an inner protective layer (1), an armor layer (2), and an outer protective layer (3) which are sequentially arranged from the inside to the outside, wherein the outer wall of the inner protective layer (1) is in contact with the inner wall of the armor layer (2), a cable assembly (5) is arranged inside the inner protective layer (1), a flame retardant cavity (4) is formed between the armor layer (2) and the outer protective layer (3), a flame retardant unit is arranged in the flame retardant cavity (4), and the flame retardant unit is used to provide flame retardant protection for the cable assembly (5); The flame retardant unit comprises a double-layer hollow tube (6) sleeved on the outer wall of the armor layer (2), the outer wall of the double-layer hollow tube (6) is installed with a corrugated support net (8), and the convex side outer wall of the corrugated support net (8) is connected to the inner wall of the outer protective layer (3), a connecting net (9) is provided between the outer walls of adjacent corrugated support nets (8) on one side close to each other, and the connecting net (9) is close to the inner wall of the outer protective layer (3), and the inner sides of the corrugated support net (8) and the connecting net (9) are both provided with flame retardant fillers (10); The inner wall of the double-layer hollow tube (6) is provided with multiple groups of support bars (7) at equal intervals, and an elastic extrusion membrane (14) is installed on the outer wall of the side where the two groups of support bars (7) are close to each other. The outer wall of the double-layer hollow tube (6) is provided with an extrusion port (11), and a connecting tube (13) is installed through the outer wall of the double-layer hollow tube (6), and the bottom end of the connecting tube (13) passes through the elastic extrusion membrane (14) and extends to the inner side of the elastic extrusion membrane (14). A sealing membrane (12) is attached to the outer wall of the double-layer hollow tube (6), and the sealing membrane (12) seals the extrusion port (11) and the top end of the connecting tube (13). A supplementary filler (15) is filled between the outer side of the elastic extrusion membrane (14) and the inner side of the hollow elastic tube (16), and an expansion filler is filled between the inner side of the elastic extrusion membrane (14) and the inner side of the hollow elastic tube (16).

2. The flame retardant wire and cable with a protective structure according to claim 1, characterized in that: The supplementary filler (15) is a flame retardant filler (10).

3. The flame retardant wire and cable with a protective structure according to claim 1, characterized in that: The expansion filler is dry ice or heat-expandable microspheres.

4. The flame retardant wire and cable with a protective structure according to claim 1, characterized in that: The cable assembly (5) comprises a hollow elastic tube (16) located inside the inner protective layer (1), and the hollow elastic tube (16) and the inner protective layer (1) are coaxially arranged, support seats (17) are arranged at equal intervals on the outer wall of the hollow elastic tube (16), a protective assembly is arranged between the support seat (17) and the inner wall of the inner protective layer (1), a cable core (21) is arranged inside the protective assembly, the outer wall of the cable core (21) is covered with an insulating layer (22), and the insulating layer (22) is located inside the protective assembly.

5. The flame retardant wire and cable with a protective structure according to claim 4, characterized in that: The protective assembly includes a lower protective shell (18) fixedly connected to the arc-shaped inner wall of the support frame, the outer wall of the lower protective shell (18) is slidably connected to the upper protective shell (19), and the upper protective shell (19) is located above the lower protective shell (18), the outer wall of the upper protective shell (19) is connected to the inner wall of the inner protective layer (1), the top wall of the upper protective shell (19) and the bottom wall of the lower protective shell (18) are symmetrically provided with a fixing seat (20) about the axial direction of the insulating layer (22), and the outer wall of the insulating layer (22) is symmetrically provided with a guide frame (23), and the guide frame (23) is located between the insulating layer (22) and the fixed seat (20), the inner wall of the guide frame (23) is slidably provided with a cylindrical bar (24), and the outer wall of the cylindrical bar (24) is slidably connected to the outer wall of the insulating layer (22), the outer wall of the cylindrical bar (24) is provided with a connecting bar (25), and the connecting bar (25) is used to connect two adjacent groups of cylindrical bars (24), and the ends of the two groups of connecting bars (25) close to each other are rotatably connected to the rotating bar (26), and the end of the rotating bar (26) away from the insulating layer (22) is rotatably connected to the outer wall of the fixed seat (20).

6. The flame retardant wire and cable with a protective structure according to claim 5, characterized in that: The lower protective shell (18) and the upper protective shell (19) are both semi-cylindrical, the axial direction of the cylindrical strip (24) is parallel to the axial direction of the insulating layer (22), and the guide frames (23) are distributed at equal intervals along the axial direction of the insulating layer (22).

7. The flame retardant wire and cable with a protective structure according to claim 5, characterized in that: An elastic support shell (27) is installed inside the inner protective layer (1), and the elastic support shell (27) is located outside the upper protective shell (19). The support seat (17) passes through the inside of the elastic support shell (27), and a buffer filler (28) is provided between the inside of the inner protective layer (1) and the outside of the elastic support shell (27).

8. The flame retardant wire and cable with a protective structure according to claim 4, characterized in that: The outer wall of the cable core (21) is sleeved with connecting rings (29) at equal intervals, and the connecting rings (29) are located inside the insulating layer (22). An inner tube (30) is coaxially arranged inside the hollow elastic tube (16). A partition bar (31) is installed on the outer wall of the inner tube (30), and the outer wall of the partition bar (31) away from the inner tube (30) is connected to the inner wall of the hollow elastic tube (16). An indicator light (32) is installed on the inner wall of the hollow elastic tube (16), and the indicator light (32) is electrically connected to the connecting ring (29) through a wire. A photoelectric sensor (33) is installed on the outer wall of the inner tube (30), and the photoelectric sensor (33) and the indicator light (32) are correspondingly arranged. A wireless transmission module (34) and a positioning module (35) are installed inside the hollow tube, and the positioning module (35), the photoelectric sensor (33), the indicator light (32) and the wireless transmission module (34) are electrically connected.

9. The flame retardant wire and cable with a protective structure according to claim 8, characterized in that: The number of installed groups of the separation strips (31) and the cable cores (21) is the same.

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