Large-current-carrying-capacity weather-proof flexible direct-current dynamic cable for shore power

Abstract

The utility model provides a large-current-carrying-capacity weather-proof flexible direct-current dynamic cable for shore power. The large-current-carrying-capacity weather-proof flexible direct-current dynamic cable sequentially comprises a cable core, a wrapping tape, an inner sheath, a reinforcing layer and an outer sheath from inside to outside, the cable core comprises a power wire core and a control wire core, the power wire core comprises a power wire conductor and a power wire insulation wrapping the power wire conductor, and the control wire core comprises a control wire conductor and a control wire insulation wrapping the control wire conductor; and the inner sheath and the outer sheath are prepared from a blend of thermoplastic polyurethane and nano titanium dioxide. According to the utility model, the sheath is prepared from the blend of thermoplastic polyurethane and nano titanium dioxide, so that the cable is ensured not to crack under sunlight irradiation and high temperature, the oxidation and aging of the cable sheath material are delayed, and the weather resistance of the cable is ensured, thereby realizing long-life operation.

Description

Technical Field

[0001] The utility model relates to a cable, in particular to a large current-carrying weather-resistant flexible direct current dynamic cable for shore power. Background Art

[0002] At present, there are initiatives at home and abroad to promote large current-carrying flexible dynamic connection cables as connection equipment, encouraging aircraft to use airport current supply facilities when they are parked at airports, avoiding aircraft operation on the apron and reducing CO2, NO X and other air pollutant emissions. For example, the International Air Transport Association (IATA) has promoted the Green Airplane initiative, which encourages the use of high-power and high-efficiency PCD cables in shore power systems provided by airports to support airlines in receiving large amounts of power quickly, safely and reliably at parking stands, and in data processing and communications in internal communication networks and mobile end-to-end applications. For China, the policy orientation of a new round of energy consumption revolution and new urbanization construction has also prompted the clean energy transformation in the field of aviation transportation. At present, some major domestic airports have or are planning to implement facilities using large-current flexible dynamic connection cables. As environmental issues including air quality, energy consumption, carbon emissions and other issues gradually receive attention, it is believed that this trend will continue to be promoted and developed in the future.

[0003] The application requirements of large current-carrying weather-resistant flexible dynamic cables are mainly reflected in the following aspects:

[0004] Large current carrying capacity: In modern aviation, various devices require a lot of electricity, especially large passenger aircraft. In order to ensure that the aircraft parked at the parking position can make full use of the shore power system, the cable needs to have a large current carrying capacity, generally reaching more than 1000A.

[0005] Flexibility and wear resistance: Due to the swinging effect of the aircraft at the landing site, the cable needs to work under severe natural conditions such as wind, sun, friction and vibration, so it needs to have good flexibility and wear resistance.

[0006] High temperature and heat resistance: The insulation material needs to have high temperature and heat resistance, be able to withstand the various challenges faced in high temperature and long-term working environments, and ensure the service life of the cable.

[0007] Quick connection and disconnection: When the aircraft enters and leaves the station, quick connection cables are required to enable the aircraft to safely, quickly and conveniently perform power supply and information exchange to meet the operational needs of the crew.

[0008] Therefore, high-current-carrying weather-resistant flexible dynamic cables need to have practical performance advantages to meet the power, data communication and other information processing needs of aircraft during their stay at the parking stand. At the same time, they must be able to maintain high reliability, stability and safety under various climatic and operating conditions.

[0009] When large current-carrying weather-resistant flexible dynamic cables are used outdoors, they are inevitably exposed to sunlight, especially in hot summer. Since the ultraviolet light in the sunlight has a short wavelength and high energy, the molecular bonds in the polymer chains of the cable sheath are easily broken by photons, thereby reducing performance and accelerating aging.

[0010] In addition, during use or storage, the surface of the sheath gradually changes due to heat, ozone oxidation, or the catalytic effect of metal ions, such as discoloration, stickiness, hardening and brittleness, cracks, etc. At the same time, the mechanical properties are reduced, the elongation rate is greatly reduced, and the air permeability is increased, causing the cable to age and lose its use value. Utility Model Content

[0011] The utility model aims to provide a large current carrying weather-resistant flexible DC dynamic cable for shore power.

[0012] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a large-current-carrying weather-resistant flexible DC dynamic cable for shore power, which comprises, from the inside to the outside, a cable core, a wrapping tape, an inner sheath, a reinforcement layer and an outer sheath; the cable core comprises a power line core and a control line core, the power line core comprises a power line conductor and a power line insulation wrapping the power line conductor, the control line core comprises a control line conductor and a control line insulation wrapping the control line conductor; the inner sheath and the outer sheath are prepared from a blend of thermoplastic polyurethane and nano-titanium dioxide.

[0013] The utility model also has the following characteristics: the power line conductor is made of flexible Class 6 tinned copper stranded, and the stranding pitch-diameter ratio is 15-20 times; the control line conductor is made of flexible Class 5 tinned copper stranded, and the stranding pitch-diameter ratio is 8-10 times.

[0014] The utility model also has the following characteristics: the power line insulation and the control line insulation are made of ethylene propylene rubber, the power line insulation and the control line insulation have a tensile strength greater than 8MPa, an elongation greater than 250%, and a hardness not exceeding 90A.

[0015] The utility model also has the following characteristics: there are at least two power line cores, which are tangentially and symmetrically arranged.

[0016] The utility model also has the following characteristics: there are four power line cores.

[0017] The utility model also has the following characteristics: there are eight control wire cores, two of which are twisted into a group, and each group of control wire cores is embedded in the gap outside the adjacent power wire cores.

[0018] The utility model also has the following characteristics: the thermoplastic polyurethane is polyether thermoplastic polyurethane or polyester thermoplastic polyurethane, the inner sheath 4 and the outer sheath 6 have a strength greater than 20MPa, an elongation greater than 500%, and a hardness not exceeding 80A.

[0019] The utility model also has the following characteristics: the wrapping tape is a non-woven fabric, the tensile strength of the non-woven fabric is greater than 250N / 25mm, the elongation at break is greater than 90%, the shrinkage is less than 7%, and the volume resistivity is greater than 1x1014Ω·m.

[0020] The utility model also has the following feature: the reinforcement layer is a fiber reinforcement layer.

[0021] The utility model also has the following characteristics: the fiber reinforcement layer is made of high modulus twisted aramid, the high modulus twisted aramid has a linear density of 3160dtex, a breaking strength greater than 500N, an elongation at break of 1.8-2.5%, and a tensile modulus of not less than 75N / tex.

[0022] By using the technical solution provided by the utility model, the sheath is prepared by a blend of thermoplastic polyurethane and nano-titanium dioxide, which ensures that the cable will not crack under sunlight and high temperature, delays oxidation and aging of the cable sheath material, ensures the weather resistance of the cable, and thus achieves long-life operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the utility model. DETAILED DESCRIPTION

[0024] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] See also Figure 1 The utility model is a large current-carrying weather-resistant flexible DC dynamic cable for shore power, which comprises a cable core, a wrapping tape 3, an inner sheath 4, a reinforcement layer 5 and an outer sheath 6 from the inside to the outside; the cable core comprises a power line core 1 and a control line core 2, the power line core 1 comprises a power line conductor 11 and a power line insulation 12 wrapping the power line conductor, the control line core 2 comprises a control line conductor 21 and a control line insulation 22 wrapping the control line conductor; the inner sheath 4 and the outer sheath 6 are prepared from a blend of thermoplastic polyurethane and nano-titanium dioxide. Thermoplastic polyurethane has excellent antioxidant properties, and nano-titanium dioxide has excellent anti-ultraviolet and anti-oxidation properties, which ensures that the cable will not crack under sunlight and high temperature, delays oxidation and aging of the cable sheath material, and ensures the weather resistance of the cable, thereby achieving long-life operation.

[0028] According to an embodiment of the utility model, the power line conductor 11 is made of flexible Class 6 tinned copper stranded, with a stranding pitch ratio of 15-20 times; the control line conductor 21 is made of flexible Class 5 tinned copper stranded, with a stranding pitch ratio of 8-10 times. The power line core 1 is made of flexible Class 6 tinned copper conductor, and the control line core 2 is made of flexible Class 5 tinned copper conductor, which can ensure the anti-oxidation ability of the conductor.

[0029] According to an embodiment of the utility model, the power line insulation 12 and the control line insulation 22 are made of ethylene propylene rubber, and the power line insulation 12 and the control line insulation 22 have a tensile strength greater than 8MPa, an elongation greater than 250%, and a hardness not exceeding 90A.

[0030] According to an embodiment of the utility model, there are at least two power cores 1, which are arranged tangentially and symmetrically. Specifically, there are four power cores 1. There are eight control cores 2, and each two are twisted into a group, and each group of control cores is embedded in the gap outside the adjacent power cores. The cable cores with different softness are symmetrically arranged to achieve matching of the overall bending radius; the control lines are twisted in pairs to eliminate crosstalk during signal transmission, and are symmetrically embedded in the gap outside the power core arrangement to ensure the roundness of the cable while achieving self-elimination of signal crosstalk.

[0031] According to an embodiment of the utility model, the thermoplastic polyurethane is polyether thermoplastic polyurethane or polyester thermoplastic polyurethane, and the inner sheath 4 and the outer sheath 6 have a strength greater than 20 MPa, an elongation greater than 500%, and a hardness not exceeding 80A. The use of polyurethane for the sheath can well ensure the tensile, compressive and torsional properties of the entire cable. At the same time, polyether polyurethane has more superior hydrolysis resistance.

[0032] According to an embodiment of the utility model, the wrapping tape 3 is a non-woven fabric, the tensile strength of the non-woven fabric is greater than 250N / 25mm, the elongation at break is greater than 90%, the shrinkage is less than 7%, and the volume resistivity is greater than 1x1014Ω·m. The non-woven fabric wrapping can ensure the roundness of the overall cable structure.

[0033] According to an embodiment of the utility model, the reinforcement layer 5 is a fiber reinforcement layer, specifically, the fiber reinforcement layer is made of high modulus twisted aramid, the high modulus twisted aramid has a linear density of 3160dtex, a breaking strength greater than 500N, a breaking elongation of 1.8-2.5%, and a tensile modulus of not less than 75N / tex. The middle of the sheath is reinforced with braided fibers, which greatly increases the axial tensile and torsional strength of the cable without increasing the weight of the cable.

[0034] In summary, the power line core uses flexible Category 6 tinned copper conductors, and the control line core uses flexible Category 5 tinned copper conductors, which can ensure the conductor's antioxidant capacity; the cable cores of different softness are arranged symmetrically to achieve matching of the overall bending radius; the control lines are twisted in pairs to eliminate crosstalk during signal transmission, and are symmetrically embedded in the outer gap of the power line core arrangement to ensure the roundness of the cable while achieving self-elimination of signal crosstalk; the non-woven fabric wrapping can ensure the roundness of the overall cable structure; the middle of the sheath is reinforced with braided fibers to increase the axial tensile and torsional strength of the cable to a greater extent without increasing the weight of the cable. The sheath uses polyurethane to ensure the overall tensile, compressive and torsional properties of the cable; the sheath is prepared by a blend of thermoplastic polyurethane and nano-titanium dioxide to ensure that the cable will not crack under sunlight and high temperature, delay the oxidation and aging of the cable sheath material, and ensure the weather resistance of the cable, thereby achieving long-life operation.

[0035] It should be emphasized that the above are only preferred embodiments of the present invention and do not constitute any form of limitation to the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high current carrying capacity weather-resistant flexible DC dynamic cable for shore power, characterized in that: From the inside to the outside, the cable core, the wrapping tape (3), the inner sheath (4), the reinforcement layer (5) and the outer sheath (6) are arranged in sequence; the cable core comprises a power line core (1) and a control line core (2); the power line core (1) comprises a power line conductor (11) and a power line insulation (12) wrapping the power line conductor; the control line core (2) comprises a control line conductor (21) and a control line insulation (22) wrapping the control line conductor; the inner sheath (4) and the outer sheath (6) are prepared from a blend of thermoplastic polyurethane and nano-titanium dioxide.

2. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: The power line conductor (11) is made of flexible Category 6 tinned copper stranded with a stranding pitch-diameter ratio of 15-20 times; the control line conductor (21) is made of flexible Category 5 tinned copper stranded with a stranding pitch-diameter ratio of 8-10 times.

3. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: The power line insulation (12) and the control line insulation (22) are made of ethylene propylene rubber, and the power line insulation (12) and the control line insulation (22) have a tensile strength greater than 8 MPa, an elongation greater than 250%, and a hardness not exceeding 90A.

4. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: There are at least two power line cores (1), which are arranged tangentially and symmetrically.

5. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 3, characterized in that: There are four power line cores (1).

6. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 4, characterized in that: There are eight control wire cores (2), two of which are twisted into a group, and each group of control wire cores (2) is embedded in the gap outside the adjacent power wire cores (1).

7. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: The thermoplastic polyurethane is polyether thermoplastic polyurethane or polyester thermoplastic polyurethane. The inner sheath (4) and the outer sheath (6) have a strength greater than 20 MPa, an elongation greater than 500%, and a hardness not exceeding 80A.

8. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: The wrapping tape (3) is a non-woven fabric, the tensile strength of the non-woven fabric is greater than 250N / 25mm, the elongation at break is greater than 90%, the shrinkage is less than 7%, and the volume resistivity is greater than 1x10 14 Ω·m.

9. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 1, characterized in that: The reinforcement layer (5) is a fiber reinforcement layer.

10. The high current carrying capacity weather-resistant flexible DC dynamic cable for shore power according to claim 9, characterized in that: The fiber reinforcement layer is made of high modulus twisted aramid, the high modulus twisted aramid has a linear density of 3160 dtex, a breaking strength greater than 500N, a breaking elongation of 1.8-2.5%, and a tensile modulus of not less than 75N / tex.

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