High-temperature-resistant medium-voltage power cable for rail transit rolling stock
By using a combined structure of conductor reinforced composite layer, high-temperature insulation layer and sheath layer, braided shield layer and ceramic fiber yarn protective layer in the power cable, the multiple performance requirements of existing power cables in the use environment of high-speed railway EMU locomotives are solved, and the efficient thermal load capacity, tensile strength and environmental stress resistance are achieved.
Patent Information
- Application Number
- CN202421973864.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-08-15
AI Technical Summary
In the use environment of high-speed railway EMU locomotives, existing power cables are difficult to meet the multiple performance requirements such as high temperature, low smoke, halogen-free flame retardant, oil resistance, and salt spray corrosion resistance.
A high-temperature medium-voltage power cable for rail transit rolling stock is designed, and a conductor, conductor reinforced composite layer, insulating layer, braided shield layer, sheath layer and protective layer structure are arranged in sequence from the inside to the outside. Among them, the conductor reinforced composite layer is wrapped with a high-temperature and high-voltage polyester film, and aramid wire twisted rope is placed horizontally around the conductor; the insulating layer and sheath layer are low-smoke, halogen-free flame-retardant silicone rubber with high temperature resistance of 150°C, and are continuously vulcanized to improve thermal load capacity; the braided layer is braided with tin-plated copper wire and aramid wire, and ceramicized glass fiber yarns are woven outside the sheath layer to improve notch resistance.
The cable exhibits high tensile strength, wear resistance, corrosion resistance in high temperature environments, and has good antibacterial and mildew resistance. It is suitable for the use temperature range of -45~150℃.
Smart Images
Figure CN223038634U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power cables, and particularly relates to a high-temperature resistant medium-voltage power cable for rail transit locomotives and vehicles. Background Art
[0002] With the rapid development of the train and vehicle industry, the market prospect of the wire and cable for EMUs is very broad. Due to the harsh operating environment of EMUs, long service life, and continuous twisting of the cable with the train, the performance requirements for the cable are very high. The specific operating environment inside the high-speed railway EMU locomotive places relatively strict requirements on the performance of the cable, and the cable should have electrical reliability, operating safety, heat resistance, low-smoke and halogen-free flame retardant performance, as well as properties such as non-toxic, asbestos-free, oil-resistant, and salt spray corrosion-resistant.
[0003] So far, the ordinary low-voltage power and control cables for locomotives are basically mature, but special products such as high-temperature resistant power cables and thin-wall instrument cables still need to be developed. The successful development of this product not only drives the development of tinned copper wire towards high quality, but also provides a research and development direction for promoting high-temperature resistant locomotive cable materials. This product not only creates economic benefits, but also creates social value, and at the same time will drive the improvement of local employment rate. Therefore, it is urgent to develop and put into use the high-temperature resistant wire and cable for EMUs as soon as possible. Content of the Utility Model
[0004] In view of the above problems, the utility model discloses a high-temperature resistant medium-voltage power cable for rail transit locomotives and vehicles, which has outstanding advantages such as high strength, high wear resistance, easy bending, light weight, and small outer diameter.
[0005] A high-temperature resistant medium-voltage power cable for rail transit locomotives and vehicles includes a conductor, a conductor strengthening composite layer, an insulating layer, a braided shielding layer, a sheath layer, and a protective layer arranged in sequence from inside to outside; the conductor strengthening composite layer is wound with a high-temperature and high-voltage resistant polyester film, and after winding, at least one aramid fiber twisted rope is horizontally placed along the radial direction of the conductor at positions 90° apart around the conductor, and a light non-woven fabric tape is wound outside the aramid fiber twisted rope.
[0006] Preferably, the conductor is stranded by the 5th type of tinned soft copper conductor and is compacted by using a customized compacting die.
[0007] Preferably, both the insulating layer and the sheath layer are 150°C high-temperature resistant vulcanized low-smoke and halogen-free flame retardant silicone rubber, and the molecular structure of the silicone rubber is a network structure.
[0008] Preferably, the braided layer includes braiding of tinned copper wire and aramid fiber.
[0009] Preferably, a ceramicized glass fiber yarn is braided outside the flame retardant silicone rubber of the sheath layer.
[0010] Beneficial effects
[0011] 1. The conductor is stranded by Class 5 tinned soft copper conductors and compacted using a customized compacting die to control the outer diameter of the conductor to the minimum value.
[0012] 2. The conductor strengthening composite layer can effectively enhance the tensile force borne by the cable during installation and laying, improve the tensile strength of the cable. Since the aramid fiber twisted ropes are horizontally arranged and evenly spaced at 90°, the force is evenly distributed. At the same time, the winding of the inner layer of high-temperature and high-voltage resistant polyester film and light non-woven fabric can prevent adhesion to the sheath during sheath extrusion, ensuring the free movement of the aramid fiber twisted ropes and giving full play to the role of the tensile strength.
[0013] 3. The insulating layer uses 150°C high-temperature resistant vulcanized low-smoke and halogen-free flame-retardant silicone rubber insulation. After insulation extrusion, continuous vulcanization is carried out under a saturated steam pressure of 0.8 - 1.0 MPa. After vulcanization, the molecular structure of the insulating material changes from a linear structure to a network structure. The change in the molecular structure enables the insulation to withstand higher thermal loads, and the continuous service temperature can reach 150°C.
[0014] 4. Braided strengthening shielding layer: The braided layer is made of tinned copper wires. To ensure the tensile strength of the braided layer, high-strength aramid fibers are used to replace some of the tinned copper wires, improving the tensile strength of the shielding layer while ensuring the anti-interference performance of the shielding layer.
[0015] 5. The sheath layer uses 150°C high-temperature resistant vulcanized low-smoke and halogen-free flame-retardant silicone rubber sheath. After sheath extrusion, continuous vulcanization is carried out under a saturated steam pressure of 0.8 - 1.0 MPa. After vulcanization, the molecular structure of the material changes from a linear structure to a network structure. The change in the molecular structure enables the sheath to withstand higher thermal loads, and the continuous service temperature can reach 150°C. At the same time, the physical and mechanical properties and tear resistance of the sheath are improved.
[0016] 6. To avoid the poor notch resistance of the silicone rubber material, a layer of ceramized glass fiber yarn is braided outside the silicone rubber sheath, and the braiding density can reach 100%. During the use and laying of the cable, due to the protection of the braided layer, the environmental stress resistance and various mechanical stresses received by the cable can be significantly improved. The wear resistance and corrosion resistance of the cable are enhanced, and it has good antibacterial and antifungal capabilities, and can be used continuously at -45 to 150°C. Description of the drawings
[0017] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.
[0018] Figure 1 is a schematic structural diagram of the present utility model;
[0019] In the figure, 1---conductor, 2----conductor strengthening composite layer, 3----insulation layer, 4----braided shielding layer, 5----sheath, 6----protective layer. Specific embodiments
[0020] First of all, it should be pointed out that the description in this section is only for the preferred embodiments for implementing the present invention. Without changing the principle of the present invention, those skilled in the art can make modifications to the technical solutions described here, and these modifications will also fall within the scope of the present invention.
[0021] As Figure 1 shown, the present utility model discloses a high-temperature resistant medium-voltage power cable for rail transit locomotives and vehicles, which includes a conductor 1 located in the center, a conductor strengthening composite layer 2 coated on the outside of the conductor 1, an insulation layer 3, a braided shielding strengthening layer 4, a sheath 5 and a protective layer 6 coated in sequence on the outside of the conductor strengthening composite layer 2.
[0022] The conductor 1 is stranded by class 5 tinned soft copper conductors and is tightly pressed using a customized compacting die to control the outer diameter of the conductor to the minimum value.
[0023] The conductor strengthening composite layer 2 is wound with a high-temperature and high-voltage polyester film. After winding, one aramid fiber twisted rope is horizontally placed in the radial direction of the conductor at positions 90° apart around the conductor, and a light non-woven fabric tape is wound outside the aramid fiber twisted rope to form the conductor strengthening composite layer.
[0024] The insulation layer 3 is extruded and continuously vulcanized with a 150°C high-temperature resistant, low-smoke, halogen-free, flame-retardant silicone rubber insulation. After insulation extrusion, continuous vulcanization is carried out using a saturated steam pressure of 0.8 - 1.0 MPa. After vulcanization, the molecular structure of the insulation material changes from a linear structure to a network structure. The change in the molecular structure enables the insulation to withstand a higher thermal load, and the continuous service temperature can reach 150°C.
[0025] The braided layer 4 is woven with tinned copper wires. To ensure the tensile strength of the braided layer, high-strength aramid fibers are used to replace some tinned copper wires, improving the tensile strength of the shielding layer while ensuring the anti-interference performance of the shielding layer.
[0026] The sheath 5 is made by extrusion and continuous vulcanization of a heat-resistant 150°C vulcanized low-smoke, halogen-free, flame-retardant silicone rubber sheath. After the sheath is extruded, continuous vulcanization is carried out using a saturated steam pressure of 0.8 - 1.0 MPa. After vulcanization, the molecular structure of the material changes from a linear structure to a network structure. This change in molecular structure enables the sheath to withstand higher thermal loads, and the continuous use temperature can reach 150°C. At the same time, the physical and mechanical properties and tear resistance of the sheath are improved. To avoid the poor notch resistance of the silicone rubber material, a layer of ceramized glass fiber yarn is woven outside the silicone rubber sheath, and the weaving density reaches 100%. During the laying and use of the cable, due to the protection of the woven layer, the cable's resistance to environmental stress and various mechanical stresses can be significantly improved. The abrasion resistance and corrosion resistance of the cable are enhanced, and it has good antibacterial and anti-mildew capabilities, and can be used continuously at -45~150°C.
[0027] In this embodiment, the conductor reinforcement composite layer 2 is made by winding a heat-resistant and high-voltage polyester film. After winding, one aramid fiber twist rope is horizontally placed along the radial direction of the conductor at positions 90° apart around the conductor, and a light non-woven fabric tape is wound outside the aramid fiber twist rope to form the conductor reinforcement composite layer.
[0028] In this embodiment, the insulating layer 3 is made by extrusion and continuous vulcanization of a heat-resistant 150°C vulcanized low-smoke, halogen-free, flame-retardant silicone rubber insulation.
[0029] In this embodiment, the braided layer 4 is made by braiding tinned copper wires.
[0030] In this embodiment, the sheath layer 5 is made by extrusion and continuous vulcanization of a heat-resistant 150°C vulcanized low-smoke, halogen-free, flame-retardant silicone rubber sheath.
[0031] In this embodiment, the protective layer 6 is made by braiding ceramized fiber yarn.
[0032] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.
Claims
1. A high temperature resistant medium voltage power cable for rail transit locomotives and vehicles, characterized in that: It includes a conductor, a conductor reinforcement composite layer, an insulating layer, a braided shielding layer, a sheath layer and a protective layer which are arranged in sequence from the inside to the outside; the conductor reinforcement composite layer is wrapped with a high-temperature and high-voltage resistant polyester film, and after wrapping, at least one aramid yarn twisted rope is horizontally placed at positions 90° apart around the conductor along the radial direction of the conductor, and a light non-woven fabric belt is wrapped outside the aramid yarn twisted rope.
2. A high temperature resistant medium voltage power cable for rail transit locomotive and vehicle according to claim 1, characterized in that: The conductor is a stranded 5th category tinned soft copper conductor, which is compacted using a custom compacting die.
3. A high temperature resistant medium voltage power cable for rail transit locomotive and vehicle according to claim 1, characterized in that: The insulating layer and the sheath layer are both made of high temperature resistant 150°C vulcanized low-smoke halogen-free flame-retardant silicone rubber, and the molecular structure of the silicone rubber is a mesh structure.
4. A high temperature resistant medium voltage power cable for rail transit locomotive and vehicle according to claim 3, characterized in that: The flame retardant silicone rubber of the sheath layer is woven with ceramicized glass fiber yarn on the outside.
5. The high temperature resistant medium voltage power cable for rail transit locomotive and vehicle according to claim 1, characterized in that: The braided layer comprises tinned copper wires and aramid wires.