High-speed motor train unit high-voltage cable for bridging

Abstract

The utility model provides a high-speed motor train unit high-voltage cable for bridging, which comprises a conductor, a first semi-conductive nylon tape is wrapped outside the conductor, a conductor shielding layer is wrapped outside the first semi-conductive nylon tape, the thickness of the conductor shielding layer is increased to 1.0 mm, an insulating layer is wrapped outside the conductor shielding layer, an insulating shielding layer is wrapped outside the insulating layer, and the thickness of the insulating shielding layer is increased to 1.0 mm. The thickness of the insulation shielding layer is increased to 1.1 mm, the insulation shielding layer is wrapped by a second semi-conductive nylon tape, the second semi-conductive nylon tape is wrapped by a metal shielding layer, the metal shielding layer is wrapped by a polyester tape wrapping layer, the polyester tape wrapping layer is wrapped by a glue-coated cotton tape wrapping layer, and the glue-coated cotton tape wrapping layer is wrapped by a glue-coated cotton tape wrapping layer. The high-speed railway carriage flexible cable has the following beneficial effects: the problem that the insulating property of the cable is reduced after the cable dynamically moves for a long time at the connection part between carriages of a high-speed railway carriage is solved, and the flexible property of the cable is improved; and the requirement of small bending radius in high-speed rail laying is met.

Description

Technical Field

[0001] The utility model is a high-voltage cable for high-speed train sets used for bridging, belonging to the field of cables. Background Art

[0002] The efficient operation of high-speed railway systems is inseparable from advanced electrical connection technology. The high-voltage cables used in the connections between carriages of high-speed trains are key components to ensure the stable operation of the trains. These cables must be able to withstand the dynamic movement between carriages during high-speed travel while maintaining extremely high electrical performance and mechanical durability. At present, the thickness of the cable conductor shielding layer and the insulation shielding layer are both relatively small. After long-term dynamic movement at the connection between high-speed rail carriages, the insulation performance will decrease. In addition, the insulation layer in the cable has poor flexibility, making it difficult to meet the requirements of a small bending radius when laying on high-speed railways. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a high-speed EMU high-voltage cable for bridging to solve the problems raised in the above-mentioned background technology. The utility model solves the problem of reduced insulation performance of the cable after long-term dynamic movement at the connection between high-speed railway carriages, greatly improves the flexibility of the cable, and meets the requirement of a small bending radius when laying on high-speed railways.

[0004] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a high-voltage cable for high-speed EMUs for bridging, comprising a conductor, a first semi-conductive nylon tape wrapped around the conductor, a conductor shielding layer coated on the first semi-conductive nylon tape, the conductor shielding layer thickened to 1.0 mm, an insulating layer coated on the conductor shielding layer, an insulating shielding layer coated on the insulating layer, the insulating shielding layer thickened to 1.1 mm, a second semi-conductive nylon tape wrapped around the insulating shielding layer, a metal shielding layer coated on the second semi-conductive nylon tape, a polyester tape wrapped around the metal shielding layer, a rubber-coated cotton cloth tape wrapped around the polyester tape, and a super-soft thermoplastic low-smoke halogen-free flame-retardant polyolefin outer sheath layer coated on the rubber-coated cotton cloth tape.

[0005] Furthermore, the conductor is made of hot-dip tinned soft copper conductor that is regularly twisted and compressed, the pitch diameter ratio of the outermost twisted layer of the conductor is not greater than 18 times, the compression coefficient is not greater than 0.80, and the ovality of the conductor is within 10.

[0006] Furthermore, the conductor shielding layer is made of a semi-conductive rubber shielding material, and the insulating shielding layer is made of a semi-conductive rubber shielding material.

[0007] Furthermore, the insulating layer is 69kV ultra-soft halogen-free EPDM rubber, the average thickness of the insulating layer is not less than 8.0 mm, the concentricity of the insulating layer is not less than 90%, and the Shore hardness of the insulating layer is not greater than 58.

[0008] Furthermore, the metal shielding layer is shielded by tinned copper wire bundles, and the total cross-section of the metal shielding is ≥25mm 2 , the distance between adjacent metal wires is not more than 4mm.

[0009] Furthermore, the nominal thickness of the first semi-conductive nylon tape package is 0.12 mm, the number of layers of the first semi-conductive nylon tape package is one layer, and the overlapping rate ranges from 20% to 25%.

[0010] Furthermore, the second semi-conductive nylon tape has a nominal thickness of 0.12 mm, has two layers, and has an overlap ratio ranging from 20% to 25%.

[0011] Furthermore, the polyester tape wrapping layer is a layer of high temperature resistant polyester tape, the nominal thickness of the high temperature resistant polyester tape is 0.04 mm, and the overlap rate ranges from 15% to 20%.

[0012] Furthermore, the rubber-coated cotton cloth tape wrapping layer adopts a rubber-coated cotton cloth tape, the nominal thickness of the rubber-coated cotton cloth tape is 0.3 mm, and the overlap rate ranges from 15% to 20%.

[0013] Beneficial effects of the utility model:

[0014] 1. The conductor shielding layer is thickened to 1.0mm, the insulation shielding layer is thickened to 1.1mm, and the insulation layer is 69kV ultra-soft halogen-free EPDM rubber insulation, which solves the problem of the insulation performance degradation of the cable after long-term dynamic movement at the connection between high-speed rail carriages. At the same time, it greatly improves the softness of the cable and meets the requirement of small bending radius when laying in high-speed rail.

[0015] 2. The conductor is made of hot-dip tinned soft copper conductor, which is twisted and compressed in a regular manner. The pitch diameter ratio of the outermost layer is not more than 18 times, and the compression coefficient is not more than 0.80. The conductor ovality is controlled within 10, and the conductor is more rounded, so that the electric field is uniform in the subsequent three-layer co-extrusion process.

[0016] 3. The metal shielding layer adopts tinned copper wire bundle shielding and reversely wrapped polyester tape sheathing, which further improves the overall shielding performance of the cable. At the same time, a polyester tape sheathing layer is set. The polyester tape material is smooth and has low friction. When the cable is frequently bent, the bundled copper wire is not easy to accumulate and break. At the same time, it plays an isolation role when the outermost layer of thermoplastic halogen-free, low-smoke and highly flame-retardant polyolefin is extruded, which is conducive to the long-term and stable operation of the cable in an environment with frequent bending.

[0017] 4. The outer sheath layer adopts ultra-soft thermoplastic halogen-free, low-smoke, highly flame-retardant polyolefin sheath with high softness to meet the environmental requirements of frequent displacement of the connection between the two carriages of high-speed EMUs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 This is a schematic diagram of the structure of a high-voltage cable for high-speed train units used for bridging in the utility model;

[0020] In the figure: 1. conductor; 2. first semi-conductive nylon tape; 3. conductor shielding layer; 4. insulating layer; 5. insulating shielding layer; 6. second semi-conductive nylon tape; 7. metal shielding layer; 8. polyester tape wrapping layer; 9. rubber-coated cotton cloth tape wrapping layer; 10. outer sheath layer. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] See also Figure 1 The utility model provides a technical solution: a high-voltage cable for high-speed trains for bridging, including a conductor 1, the conductor 1 is a hot-dip tinned soft copper conductor 1 that is regularly twisted and compressed, the pitch diameter ratio of the outermost layer of the conductor 1 is not greater than 18 times, the compression coefficient is not greater than 0.80, the ovality of the conductor 1 is within 10, and the conductor 1 is more rounded, so that the electric field of the subsequent three-layer co-extrusion process is uniform, that is, the conductor shielding layer 3, the insulating layer 4 and the insulating shielding layer 5 are extruded simultaneously using a three-layer co-extrusion process.

[0023] The conductor 1 is wrapped with a first semi-conductive nylon tape 2, the nominal thickness of the first semi-conductive nylon tape 2 is 0.12mm, the number of layers of the first semi-conductive nylon tape 2 is one layer, the overlap rate range is 20% to 25%, the first semi-conductive nylon tape 2 is wrapped with a conductor shielding layer 3, the conductor shielding layer 3 is thickened to 1.0mm, the conductor shielding layer 3 is a semi-conductive rubber shielding material, the conductor shielding layer 3 is wrapped with an insulating layer 4, the insulating layer 4 is a 69kV super soft halogen-free ethylene propylene rubber, the average thickness of the insulating layer 4 is not less than 8.0mm, the concentricity of the insulating layer 4 is not less than 90%, and the Shore hardness of the insulating layer 4 is not more than 5 8. The insulating layer 4 is coated with the insulating shielding layer 5, which is thickened to 1.1 mm. The insulating shielding layer 5 adopts a semi-conductive rubber shielding material. The conductor shielding layer 3, the insulating layer 4 and the insulating shielding layer 5 are extruded simultaneously by a three-layer co-extrusion process. The conductor shielding layer 3 is thickened to 1.0 mm, and the insulating shielding layer 5 is thickened to 1.1 mm. The insulating layer 4 is 69 kV ultra-soft halogen-free EPDM rubber insulation, which solves the problem of reduced insulation performance of the cable after long-term dynamic movement at the connection between high-speed rail carriages, and at the same time greatly improves the flexibility of the cable to meet the requirement of a small bending radius when laying in high-speed rail.

[0024] The insulating shielding layer 5 is wrapped with a second semi-conductive nylon tape 6, the second semi-conductive nylon tape 6 has a nominal thickness of 0.12 mm, the second semi-conductive nylon tape 6 has two layers, and the overlap rate ranges from 20% to 25%. The second semi-conductive nylon tape 6 is wrapped with a metal shielding layer 7, and the metal shielding layer 7 is shielded by tinned copper wire bundles, and the total cross-section of the metal shield is ≥ 25 mm 2 , the spacing between adjacent metal wires is not more than 4mm, the metal shielding layer 7 is covered with a polyester tape wrapping layer 8, the polyester tape wrapping layer 8 is wrapped with a layer of high-temperature resistant polyester tape, the nominal thickness of the high-temperature resistant polyester tape is 0.04mm, and the overlap rate range is 15% to 20%, the polyester tape wrapping layer 8 is covered with a rubber-coated cotton cloth wrapping layer 9, the rubber-coated cotton cloth wrapping layer 9 is a rubber-coated cotton cloth tape, the nominal thickness of the rubber-coated cotton cloth tape is 0.3mm, the overlap rate range is 15% to 20%, and the rubber-coated cotton cloth wrapping layer 9 is covered with super soft Thermoplastic low-smoke halogen-free flame-retardant polyolefin outer sheath layer 10, the metal shielding layer 7 is shielded by tinned copper wire bundles, and the polyester tape sheath layer 8 is reversely wrapped, which further improves the overall shielding performance of the cable. At the same time, a polyester tape sheath layer 8 is provided. The polyester tape material is smooth and has low friction. When the cable is frequently bent, the bundled copper wires are not easy to accumulate and break. At the same time, it plays an isolation role when the outermost layer of thermoplastic halogen-free, low-smoke and highly flame-retardant polyolefin is extruded, which is beneficial to the long-term and stable operation of the cable in an environment with frequent bending.

[0025] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-speed train high-voltage cable for bridging, comprising a conductor (1), characterized in that: The conductor (1) is wrapped with a first semi-conductive nylon tape (2), the first semi-conductive nylon tape (2) is wrapped with a conductor shielding layer (3), the conductor shielding layer (3) is thickened to 1.0 mm, the conductor shielding layer (3) is wrapped with an insulating layer (4), the insulating layer (4) is wrapped with an insulating shielding layer (5), the insulating shielding layer (5) is thickened to 1.1 mm, the insulating shielding layer (5) is wrapped with a second semi-conductive nylon tape (6), the second semi-conductive nylon tape (6) is wrapped with a metal shielding layer (7), the metal shielding layer (7) is wrapped with a polyester tape wrapping layer (8), the polyester tape wrapping layer (8) is wrapped with a rubber-coated cotton cloth tape wrapping layer (9), and the rubber-coated cotton cloth tape wrapping layer (9) is wrapped with an ultra-soft thermoplastic low-smoke halogen-free flame-retardant polyolefin outer sheath layer (10).

2. A high-speed train high-voltage cable for bridging according to claim 1, characterized in that: The conductor (1) is a hot-dip tinned soft copper conductor (1) that is twisted and compressed in a regular manner. The pitch diameter ratio of the outermost twisted layer of the conductor (1) is not greater than 18 times, the compression coefficient is not greater than 0.80, and the ovality of the conductor (1) is within 10.

3. A high-speed train high-voltage cable for bridging according to claim 1, characterized in that: The conductor shielding layer (3) is made of semi-conductive rubber shielding material, and the insulating shielding layer (5) is made of semi-conductive rubber shielding material.

4. A high-speed train high-voltage cable for bridging according to claim 1, characterized in that: The insulating layer (4) is 69kV ultra-soft halogen-free ethylene-propylene rubber, the average thickness of the insulating layer (4) is not less than 8.0 mm, the concentricity of the insulating layer (4) is not less than 90%, and the Shore hardness of the insulating layer (4) is not greater than 58.

5. The high-voltage cable for high-speed train sets for bridging according to claim 1, characterized in that: The metal shielding layer (7) is shielded by tinned copper wire bundles, and the total cross-section of the metal shielding is ≥25mm 2 , the distance between adjacent metal wires is not more than 4mm.

6. A high-speed train high-voltage cable for bridging according to claim 1, characterized in that: The nominal thickness of the first semi-conductive nylon tape (2) is 0.12 mm, the number of layers of the first semi-conductive nylon tape (2) is one layer, and the overlapping rate ranges from 20% to 25%.

7. The high-voltage cable for high-speed train units for bridging according to claim 1, characterized in that: The nominal thickness of the second semi-conductive nylon tape (6) is 0.12 mm, the number of layers of the second semi-conductive nylon tape (6) is two, and the overlapping rate ranges from 20% to 25%.

8. The high-voltage cable for high-speed train units for bridging according to claim 1, characterized in that: The polyester tape wrapping layer (8) is a layer of high temperature resistant polyester tape, the nominal thickness of the high temperature resistant polyester tape is 0.04 mm, and the overlap rate ranges from 15% to 20%.

9. The high-voltage cable for high-speed train sets for bridging according to claim 1, characterized in that: The rubber-coated cotton cloth wrapping layer (9) is made of a rubber-coated cotton cloth tape with a nominal thickness of 0.3 mm and an overlap rate ranging from 15% to 20%.

Images