High-reliability fireproof high-speed rail traction power cable
By designing a refractory outer sheath, insulating filler layer and armor layer in high-speed rail traction power cables, mixing non-metallic thermal conduction particles into these layers and setting non-metallic thermal conduction rings and heat dissipation convex columns, the problem of insufficient fire resistance and heat dissipation capabilities of the cable is solved, and efficient heat dissipation and fire resistance improvements are achieved.
Patent Information
- Application Number
- CN202421287115.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-06
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-06-06
AI Technical Summary
The fire resistance and heat dissipation capabilities of high-speed rail traction power cables are insufficient, causing the heat emitted by the conductor core to accumulate inside the cable and catch fire.
A high-reliability refractory high-speed rail traction power cable from the outside to the inside includes a refractory outer sheath, an insulating filler layer, an armor layer, a metal shield layer and a conductor core. The cable incorporates non-metallic thermally conductive particles into the insulating filler layer and the armor layer, and a non-metallic thermally conductive ring and a heat-dissipating convex column are provided in the refractory outer sheath to achieve rapid heat dissipation and multiple sealing through these structures.
Through the design of non-metallic thermal conduction rings and heat dissipation convex columns, rapid heat dissipation of the conductor core is achieved, avoiding the fire caused by heat accumulation inside the cable, and improving the fire resistance and overall strength of the cable.
Smart Images
Figure CN222965866U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a highly reliable fire-resistant high-speed railway traction power cable. Background Art
[0002] High-speed railway traction power cables have high requirements for the fire resistance of the cables. To improve the fire resistance of such cables, two aspects can be considered. On the one hand, the internal structure of the cable is improved to enhance its fire resistance. On the other hand, the heat dissipation capacity of the cable itself is improved to prevent the heat emitted by the conductor core from accumulating inside the cable and causing a fire. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and provide a highly reliable fire-resistant high-speed railway traction power cable with high fire resistance and strong heat dissipation capacity.
[0004] The technical solution of the utility model is: a highly reliable fire-resistant high-speed railway traction power cable, which sequentially includes a fire-resistant outer sheath, a first insulating filler layer, an armored layer, a second insulating filler layer, a metal shielding layer, an inner sheath, and a conductor core from outside to inside;
[0005] Non-metallic heat-conducting particles are mixed in both the first insulating filler layer and the second insulating filler layer;
[0006] Non-metallic heat-conducting rings are equidistantly arranged in the fire-resistant outer sheath. A plurality of heat dissipation convex columns are arrayed on the outer circumference of each non-metallic heat-conducting ring. Each heat dissipation convex column has a sealing convex ring. Through holes corresponding to each heat dissipation convex column are provided on the fire-resistant outer sheath. Each heat dissipation convex column is hermetically fitted in the corresponding through hole. The outer ends of each heat dissipation convex column are spaced from the outer ends of the through holes. Annular protective edges are respectively provided on both sides of the non-metallic heat-conducting ring. The outer ends of the protective edges have a circle of flanges. The annular protective edges are abutted against the inner wall of the fire-resistant outer sheath. Corresponding grooves for the flanges are also provided on the inner circumference of the fire-resistant outer sheath. The flanges are snapped into the corresponding grooves. The sealing convex rings and flanges on the heat dissipation convex columns cooperate with the fire-resistant outer sheath to form multiple seals.
[0007] Furthermore, a plurality of steel cables are arrayed between the first insulating filler layer and the fire-resistant outer sheath. Each steel cable extends along the axial direction of the cable.
[0008] Furthermore, arc-shaped grooves corresponding to each steel cable are arrayed on the inner circumference of the non-metallic heat-conducting ring. The outer sides of each steel cable are limited on the corresponding arc-shaped grooves.
[0009] Specifically, the non-metallic heat-conducting ring is an integrally formed structure of aluminum nitride ceramics.
[0010] Furthermore, a highly flame-retardant tape is also provided on the outer side of the inner sheath.
[0011] Specifically, the armored layer is a copper tape armored layer.
[0012] Furthermore, a temperature measuring optical fiber is provided inside the copper tape armored layer, and the temperature measuring optical fiber extends along the axial direction of the cable.
[0013] Specifically, the fire-resistant outer sheath is a low-smoke and halogen-free flame-retardant polyolefin outer sheath.
[0014] The beneficial effects of the present utility model are as follows: In the present utility model, the steel cables arranged in an array can ensure the strength of the entire cable, and the settings of the fire-resistant outer sheath, the first insulating filler layer, the armored layer, and the second insulating filler layer can ensure the fire-resistant performance of the entire cable; among them, to ensure the rapid heat dissipation of the conductor core, the heat generated by the conductor core is quickly conducted through the metal shielding layer, the second insulating filler layer, the armored layer, and the first insulating filler layer to each non-metallic heat-conducting ring, and is dissipated to the outside by the convex columns of each non-metallic heat-conducting ring, which can effectively prevent heat from accumulating inside the cable and causing a fire; in addition, each non-metallic heat-conducting ring also plays a role in limiting the position of each steel cable, preventing the steel cable from directly contacting the fire-resistant outer sheath, and the steel cable also plays a role in quickly conducting heat, quickly dispersing the heat to each non-metallic heat-conducting ring, and preventing the local temperature inside the cable from being too high. Description of the Drawings
[0015] Figure 1 is a structural schematic diagram of the present utility model;
[0016] Figure 2 is a structural schematic diagram of the non-metallic heat-conducting ring in the present utility model;
[0017] Figure 3 is a partial enlarged view of the connection between the fire-resistant outer sheath and the non-metallic heat-conducting ring in the present utility model.
[0018] In the figure: fire-resistant outer sheath 1, first insulating filler layer 2, armored layer 3, second insulating filler layer 4, metal shielding layer 5, inner sheath 6, conductor core 7, non-metallic heat-conducting ring 8, heat dissipation convex column 9, sealing convex ring 10, edge guard 11, flange 12, steel cable 13, arc-shaped groove 14, high-fire-retardant tape 15, temperature measuring optical fiber 16. Detailed Embodiments
[0019] The following is a further specific description of the technical solution of the present utility model through embodiments and in combination with the drawings.
[0020] Combined with Figures 1-3 As shown, a high-reliability fire-resistant high-speed rail traction power cable includes, from outside to inside in sequence, a fire-resistant outer sheath 1, a first insulating filler layer 2, an armored layer 3, a second insulating filler layer 4, a metal shielding layer 5, an inner sheath 6, and a conductor core 7;
[0021] Non-metallic heat-conducting particles are mixed in both the first insulating filler layer 2 and the second insulating filler layer 4;
[0022] A plurality of non-metallic heat-conducting rings 8 are arranged at equal intervals inside the fire-resistant outer sheath 1. A plurality of heat-dissipating convex columns 9 are arrayed on the outer periphery of each non-metallic heat-conducting ring 8. Each heat-dissipating convex column 9 is provided with a sealing convex ring 10. The fire-resistant outer sheath 1 is provided with through holes corresponding to each heat-dissipating convex column 9. Each heat-dissipating convex column 9 is hermetically fitted in the corresponding through hole. The outer ends of each heat-dissipating convex column 9 are spaced from the outer ends of the through holes to avoid abrasion. Ring-shaped edge guards 11 are respectively arranged on both sides of the non-metallic heat-conducting ring 8. The outer ends of the edge guards 11 have a circle of flanges 12. The ring-shaped edge guards 11 are abutted against the inner wall of the fire-resistant outer sheath 1. The inner circumference of the fire-resistant outer sheath 1 also has clamping grooves corresponding to each flange 12. The flanges 12 are snapped into the corresponding clamping grooves. The sealing convex rings 10 and flanges 12 on the heat-dissipating convex columns 9 cooperate with the fire-resistant outer sheath 1 to form multiple seals to prevent external water vapor and impurities from entering the interior of the fire-resistant outer sheath 1.
[0023] In another embodiment, a plurality of steel cables 13 are also arrayed between the first insulating filler layer 2 and the fire-resistant outer sheath 1. Each steel cable 13 extends along the axial direction of the cable.
[0024] In another embodiment, arc-shaped grooves 14 corresponding to each steel cable 13 are also arrayed on the inner circumference of the non-metallic heat-conducting ring 8. The outer sides of each steel cable 13 are limited on the corresponding arc-shaped grooves 14.
[0025] In the above structure, the arrayed steel cables 13 can ensure the strength of the whole cable. The settings of the fire-resistant outer sheath 1, the first insulating filler layer 2, the armor layer 3 and the second insulating filler layer 4 can ensure the fire-resistant performance of the whole cable. Among them, to ensure the rapid heat dissipation of the conductor core 7, the heat generated by the conductor core 7 is quickly conducted to each non-metallic heat-conducting ring 8 through the metal shielding layer 5, the second insulating filler layer 4, the armor layer 3 and the first insulating filler layer 2, and is dissipated to the outside by the convex columns of each non-metallic heat-conducting ring 8, which can effectively prevent heat from accumulating inside the cable and causing a fire. In addition, each non-metallic heat-conducting ring 8 also plays a role in limiting each steel cable 13 to prevent the steel cable 13 from directly abutting against the fire-resistant outer sheath 1, and the steel cable 13 also plays a role in quickly conducting heat, quickly dispersing the heat to each non-metallic heat-conducting ring 8, and preventing the local temperature inside the cable from being too high.
[0026] In another embodiment, the non-metallic heat-conducting ring 8 is an integrally formed structure of aluminum nitride ceramics.
[0027] In another embodiment, as Figure 1 shown, a highly flame-retardant tape 15 is also arranged on the outer side of the inner sheath 6 to further improve the fire-resistant performance of the cable.
[0028] In another embodiment, the armor layer 3 is a copper tape armor layer to improve the heat-conducting performance of the armor layer 3.
[0029] In another embodiment, a temperature-measuring optical fiber 16 is further provided inside the copper tape armor layer 3. The temperature-measuring optical fiber 16 extends along the axial direction of the cable, and the temperature inside the cable can be monitored in real time by cooperating with a corresponding algorithm.
[0030] In another embodiment, the fire-resistant outer sheath 1 is a low-smoke and halogen-free flame-retardant polyolefin outer sheath.
Claims
1. A high reliability fire-resistant high-speed railway traction power cable, characterized in that: The device comprises, from outside to inside, a fire-resistant outer sheath (1), a first insulating filler layer (2), an armor layer (3), a second insulating filler layer (4), a metal shielding layer (5), an inner sheath (6) and a conductor core (7); Non-metallic heat-conductive particles are mixed into the first insulating filler layer (2) and the second insulating filler layer (4); Non-metallic heat-conducting rings (8) are arranged at equal distances in the fire-resistant outer jacket (1), and a plurality of heat-dissipating convex columns (9) are arranged in an array on the outer periphery of each non-metallic heat-conducting ring (8). Each heat-dissipating convex column (9) is provided with a sealing convex ring (10). The fire-resistant outer jacket (1) is provided with a through hole corresponding to each heat-dissipating convex column (9), and each heat-dissipating convex column (9) is sealed and fitted in the corresponding through hole. The outer end of each heat-dissipating convex column (9) maintains a distance from the outer end of the through hole. The non-metallic heat-conducting ring ( 8), an annular edge guard (11) is also provided on both sides thereof, the outer end of the edge guard (11) has a circle of flange (12), the annular edge guard (11) is in contact with the inner wall of the fire-resistant outer jacket (1), the inner periphery of the fire-resistant outer jacket (1) also has a slot corresponding to each flange (12), the flange (12) is inserted into the corresponding slot, and the sealing convex ring (10) and the flange (12) on the heat dissipation convex column (9) cooperate with the fire-resistant outer jacket (1) to form a multiple seal.
2. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 1, characterized in that: A plurality of steel cables (13) are arranged in an array between the first insulating filler layer (2) and the fire-resistant outer sheath (1), and each of the steel cables (13) extends along the axial direction of the cable.
3. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 2, characterized in that: The inner circumference of the non-metallic heat-conducting ring (8) is also arrayed with arc grooves (14) corresponding to the steel cables (13), and the outer sides of the steel cables (13) are limited on the corresponding arc grooves (14).
4. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 3, characterized in that: The non-metallic heat-conducting ring (8) is an aluminum nitride ceramic integrally formed structure.
5. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 4, characterized in that: The outer side of the inner sheath (6) is also provided with a highly flame-retardant wrapping tape (15).
6. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 5, characterized in that: The armor layer (3) is a copper tape armor layer.
7. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 6, characterized in that: A temperature measuring optical fiber (16) is also provided inside the copper tape armor layer (3), and the temperature measuring optical fiber (16) extends along the axial direction of the cable.
8. A high reliability fire-resistant high-speed railway traction power cable as claimed in claim 7, characterized in that: The fire-resistant outer sheath (1) is a low-smoke, halogen-free, flame-retardant polyolefin outer sheath.