Fire-resistant and impact-resistant high-safety low-voltage power cable for rail transit

Abstract

The utility model relates to the technical field of power cable, specifically disclose a kind of fire and impact resistant high safety low voltage power cable for rail transit, including the cable of being provided with electric core, the armouring strip of circumferentially arrangement is arranged outside electric core, armouring strip is according to shape and is divided into relatively arranged sharp head and sharp tail, adjacent sharp head and sharp tail are inserted, and connecting strip is arranged between the two. The fire and impact resistant high safety low voltage power cable for rail transit provided by the utility model, double-layer shielding protection and compression buffer space are formed to electric core by the armouring strip of inside hollow, when the outer piece of armouring strip is compressed, pressure can be dispersed and handled, and the armouring strip is limited by filling material such as rubber in cable, so that reaction force is used to offset radial force, and then the armouring strip has more efficient deformation compression resistance, and also provides flame-retardant fireproof function to inside electric core, so that cable compression damage problem is greatly reduced.

Description

Technical Field

[0001] This utility model relates to the field of power cable technology, specifically to a fire-resistant, impact-resistant, high-safety, low-voltage power cable for rail transit. Background Technology

[0002] Low-voltage power cables used in rail transit typically consist of three cores, and the cores must be encased in metal armor rings to meet the cable's pressure resistance and fire protection requirements.

[0003] According to the public announcement number: CN212675953U, the public announcement date: 2021-03-09, a high-safety, mechanically impact-resistant three-core fire-resistant power cable is disclosed, including a sheath layer, multiple layers of rubber, an armor layer, and a flame-retardant layer located on the outside of the core.

[0004] In the prior art, including the aforementioned patent, when a cable is suddenly impacted or subjected to prolonged pressure, the armor layer used to protect the battery cell will also deform due to compression. As time increases, the deformation of the armor layer is often irreversible, so the armor ring will gradually fail, and may even cause creases to appear at the bending position of the armor layer, resulting in the armor layer breaking and reducing its ability to protect the battery cell inside. At the same time, it will also cause compression damage to the outer multi-layer rubber from the inside out, resulting in severe cable breakage. Utility Model Content

[0005] The purpose of this invention is to provide a fire-resistant, impact-resistant, high-safety, low-voltage power cable for rail transit, aiming to solve the problems mentioned above.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A fire-resistant, impact-resistant, high-safety, low-voltage power cable for rail transit includes a cable with a battery core. The battery core is provided with circumferentially arranged armor strips, which are divided into oppositely arranged pointed ends and pointed ends according to their shape.

[0008] Adjacent pointed ends and pointed tails are inserted together, and a connecting strip is provided between them;

[0009] The armor strip is also provided with inner and outer plates that are distributed in an inward and outward manner.

[0010] Preferably, the inner sheet is provided with a plurality of recesses that are embedded and cooperate with the sidewall of the battery cell.

[0011] Preferably, the outer side of the battery cell is provided with a filling layer that contacts the armor strip.

[0012] Preferably, the connecting strip is provided with a snap-fit ​​strip that is secured by a pointed end.

[0013] Preferably, the end of the snap-fit ​​strip is provided with a sealing strip that abuts against the filling layer.

[0014] Preferably, the outer side of the armor strip is provided with a rubber layer.

[0015] Preferably, a composite layer is provided on the outer side of the rubber layer.

[0016] Preferably, the composite layer is provided with circumferentially arranged reinforcing ribs.

[0017] Preferably, a protective layer is provided on the outside of the composite layer.

[0018] Preferably, the armor strip is a frame-shaped elastic metal sheet.

[0019] In the above technical solution, the fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit provided by this utility model has the following beneficial effects: The hollow armor strips inside form a double-layer shielding protection for the battery core, while also providing a pressure-resistant buffer space for the battery core. The connecting strips seal between the two armor strips to protect the inner battery core. When the outer sheet of the armor strip is compressed, the pressure can be dispersed, and the rubber or other filling materials inside the cable restrict the armor strip, allowing the reaction force to counteract the radial force. This gives the armor strip a more efficient deformation and pressure resistance capability, while also providing flame-retardant and fire-resistant functions for the inner battery core, greatly reducing the problem of cable damage under pressure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the cable provided for an embodiment of this utility model;

[0022] Figure 2 A schematic cross-sectional view of the cable provided in an embodiment of this utility model;

[0023] Figure 3 for Figure 2 Enlarged view of point A;

[0024] Figure 4 This is a schematic diagram of the assembly of multiple armor strips and connecting strips provided in an embodiment of the present utility model;

[0025] Figure 5 This is a schematic diagram of the assembly of a single armor strip and connecting strip provided for an embodiment of the present utility model.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Cable; 11. Protective layer; 12. Composite layer; 13. Rubber layer; 14. Filler layer; 15. Battery core; 2. Armoring strip; 21. Tip; 22. Tip; 23. Outer sheet; 24. Inner sheet; 25. Concave sheet; 3. Connecting strip; 31. Snap-fit ​​strip; 32. Sealing strip. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1-5 As shown, a fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit includes a cable 1 with a battery core 15, and a circumferentially arranged armor strip 2 on the outside of the battery core 15. The armor strip 2 is divided into a pointed end 21 and a pointed end 22 arranged opposite each other according to its shape.

[0030] Adjacent pointed ends 21 and pointed ends 22 are inserted together, and a connecting strip 3 is provided between them;

[0031] The armor strip 2 is also provided with inner plate 24 and outer plate 23 distributed in an inner and outer manner.

[0032] Specifically, the battery cell 15 includes a metal wire for conducting electricity and an insulating rubber protective sleeve on the outside of the metal wire.

[0033] Furthermore, the outer piece 23 and the inner piece 24 are located between the pointed end 21 and the pointed end 22. The pointed end 21 is triangular, while the pointed end 22 is concave triangular, so that adjacent pointed ends 21 and pointed ends 22 can be joined together.

[0034] The hollow armor strips 2 are assembled circumferentially to form a double-layer shielding protection for the inner battery cell 15. At the same time, the hollow armor strips 2 also provide a pressure-resistant buffer space for the battery cell 15. The connecting strip 3 seals the space between the two armor strips 2 to protect the inner battery cell 15. When the outer piece 23 of the armor strip 2 is compressed, the originally bent outer piece 23 moves towards the inner piece 24, converting the radial force into a circumferential force, which acts on the tip 21 and the tail 22. This allows the two ends of the armor strip 2 to apply pressure to the adjacent armor strip 2, thereby dispersing the pressure. This causes the adjacent armor strip 2 to convert the circumferential force into a radial force, and the inner piece 24 and the outer piece 23 to move away from each other. Since the armor strip 2 is located inside the cable 1 and is fixed and restricted by rubber or other filling materials, the restricted armor strip 2 uses a reaction force to counteract the radial force, thereby giving the armor strip 2 a more efficient deformation and pressure resistance. At the same time, it also provides flame-retardant and fire-resistant functions for the inner battery core 15, greatly reducing the problem of cable 1 being damaged by pressure.

[0035] As a further embodiment of this utility model, the inner sheet 24 is provided with a plurality of recessed pieces 25 that are embedded and cooperate with the sidewall of the battery cell 15.

[0036] Specifically, during the production of cable 1, the armor strip 2 is wrapped around the outside of the battery core 15, and the inner wall of the armor strip 2 is squeezed to form a concave piece 25, which is set parallel to the battery core 15.

[0037] The multiple concave pieces 25 on the inner wall of the armor strip 2 increase the contact surface with the battery cell 15, making the connection between the armor strip 2 and the battery cell 15 more stable. When the inner piece 24 converts the circumferential force into the radial force, the concave pieces 25 use the increased contact surface to further disperse the force, thereby reducing the pressure damage to the battery cell 15.

[0038] As another embodiment further provided in this utility model, a filling layer 14 that contacts the armor strip 2 is provided on the outer side of the battery cell 15.

[0039] Specifically, the filler layer 14 is used to fill the triangular area between the three battery cells 15, and the filler layer 14 contains fire-resistant and high-temperature resistant materials such as silicone rubber and polytetrafluoroethylene.

[0040] The filling layer 14 ensures the contact and wrapping range with the battery cell 15, protecting the battery cell 15, while also maintaining close contact with the armor strip 2, thereby improving the stability of the armor strip 2 in use.

[0041] As another embodiment further provided in this utility model, the connecting strip 3 is provided with a snap-fit ​​strip 31 that is secured by the pointed end 21.

[0042] Specifically, the snap-fit ​​strip 31 is V-shaped.

[0043] The rubber snap-fit ​​strip 31 ensures anti-slip and sealing functions after adjacent armor strips 2 are joined, and can also deform when transmitting circumferential force, thereby maintaining a stable connection effect.

[0044] As another embodiment of this utility model, the end of the snap-fit ​​strip 31 is provided with a sealing strip 32 that abuts against the filling layer 14.

[0045] Specifically, the sealing strip 32 is also V-shaped at one end of the snap-fit ​​strip 31.

[0046] By using the V-shaped opening of the sealing strip 32 to contact the outside of the filling layer 14, the sealing strip 32 and the filling layer 14 can maintain a larger contact area, thereby enabling the sealing strip 32 to form a reinforced seal on the inner side of the adjacent armor strip 2.

[0047] As another embodiment provided in this utility model, a rubber layer 13 is provided on the outer side of the armor strip 2.

[0048] The rubber layer 13, composed of silicone rubber and cross-linked polyethylene, provides basic protection and resistance to wear and high temperatures.

[0049] As another embodiment of the present invention, a composite layer 12 is provided on the outer side of the rubber layer 13.

[0050] The composite layer 12, composed of glass fiber, silicone rubber, and aluminum, provides better high-temperature resistance, as well as moisture and corrosion resistance.

[0051] As another embodiment of this utility model, the composite layer 12 is provided with circumferentially arranged reinforcing ribs.

[0052] The cable 1 is made of steel wire rope to enhance its tensile and bending resistance.

[0053] As another embodiment provided in this utility model, a protective layer 11 is provided on the outer side of the composite layer 12.

[0054] The polyethylene protective layer 11 provides water and chemical corrosion resistance to the cable 1, making it suitable for outdoor use.

[0055] As another embodiment further provided in this utility model, the armor strip 2 is specifically a frame-shaped elastic metal sheet.

[0056] The armor strip 2, made of elastic metal sheet, can deform significantly under pressure, resulting in stronger force transmission and better compressive strength.

[0057] Working principle: When the outer piece 23 of the armor strip 2 is compressed, the originally bent outer piece 23 moves towards the inner piece 24, converting the radial force into a circumferential force, which acts on the tip 21 and the tail 22. This allows the two ends of the armor strip 2 to apply pressure to the adjacent armor strip 2, thereby dispersing the pressure. This causes the adjacent armor strip 2 to convert the circumferential force into a radial force, and keeps the inner piece 24 and the outer piece 23 away from each other. Since the armor strip 2 is located inside the cable 1 and is fixed and restricted by rubber or other filling materials, the restricted armor strip 2 uses the reaction force to counteract the radial force, thereby giving the armor strip 2 a more efficient deformation and pressure resistance.

[0058] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit, characterized in that, The cable (1) includes a battery core (15), and the battery core (15) is provided with a circumferentially arranged armor strip (2) on the outside. The armor strip (2) is divided into a pointed head (21) and a pointed tail (22) arranged opposite to each other according to its shape. Adjacent pointed ends (21) and pointed ends (22) are inserted together, and a connecting strip (3) is provided between them. The armor strip (2) is also provided with an inner piece (24) and an outer piece (23) distributed in an inner and outer manner.

2. The fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 1, characterized in that, The inner sheet (24) is provided with a plurality of recessed pieces (25) that are embedded and cooperate with the side wall of the battery cell (15).

3. The fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 1, characterized in that, The outer side of the battery cell (15) is provided with a filling layer (14) that contacts the armor strip (2).

4. The fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 3, characterized in that, The connecting strip (3) is provided with a snap-fit ​​strip (31) that is secured by a pointed tip (21).

5. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 4, characterized in that, The end of the snap-fit ​​strip (31) is provided with a sealing strip (32) that abuts against the filling layer (14).

6. The fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 4, characterized in that, A rubber layer (13) is provided on the outside of the armor strip (2).

7. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 6, characterized in that, A composite layer (12) is provided on the outside of the rubber layer (13).

8. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 7, characterized in that, The composite layer (12) is provided with circumferentially arranged reinforcing ribs.

9. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 7, characterized in that, A protective layer (11) is provided on the outside of the composite layer (12).

10. A fire-resistant, impact-resistant, high-safety low-voltage power cable for rail transit according to claim 1, characterized in that, The armor strip (2) is specifically a frame-shaped elastic metal sheet.

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