CN210156166U

CN210156166U - Low inductance track traffic signal cable

Info

Publication number: CN210156166U
Application number: CN201920963451.3U
Authority: CN
Inventors: 王子纯; 姚勰; 崔淦泉; 邵秀琴; 缪旭伦; 韩桂萍
Original assignee: Jiangsu Dongqiang Co Ltd
Current assignee: Jiangsu Dongqiang Co Ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-03-17
Anticipated expiration: 2029-06-25

Abstract

The utility model discloses a low inductance track traffic signal cable, including the cable core to and constitute a plurality of star quad slit of cable core, star quad slit is twisted by four low inductance insulation heart yearns and forms, and this low inductance insulation heart yearn includes the heart yearn fiber bundle that is located central point, from inside to outside cladding has inner conductor, foam insulation layer, outer conductor, heart yearn insulation band and heart yearn shielding layer in proper order on heart yearn fiber bundle, has laid the drainage line along length direction between heart yearn insulation band and heart yearn shielding layer; the cable core is coated with a cable core insulating wrapping tape, and the cable core insulating wrapping tape is sequentially coated with an inner protection layer, a cable core shield and an outer sheath outwards. The core wire fiber bundle is formed by twisting chemical fiber filaments. The inner conductor and the outer conductor are formed by weaving a plurality of strands of soft round copper wires. The cable not only has lower inductance and capacitance, but also has strong anti-interference capability and safe and reliable signal transmission.

Description

Low inductance track traffic signal cable

Technical Field

The utility model relates to a cable technical field for the track traffic especially relates to a signal control cable for track traffic signal control system.

Background

The rail transit signal cable is a key component for connecting rail transit signals, related equipment and control devices in a communication system, and is used for transmitting the rail transit signals, audio signals, analog signals, digital signals, system control information and electric energy. Therefore, the rail transit signal cable not only has safe and reliable signal transmission performance, but also has electrical performance such as information transmission and energy transmission.

The basic structure of the prior track traffic signal cable comprises an outer protective layer and a cable core positioned in the outer protective layer, wherein the cable core is composed of a plurality of shielding control line groups. However, when the control line becomes longer and the control power supply is ac, the distributed capacitance and inductance between the core wires inside the cable and between the core wires and the shielding layer reach a certain value, which causes malfunction of the control loop and transmission of error information, which affects normal operation of the high-speed railway and may seriously cause safety problems. Therefore, a novel cable is needed to be designed, the distributed capacitance and inductance between the core wires and the shielding layer are smaller, when the length of the cable is increased to 3km, the effective signal can still be received by the signal receiving end, and the long-distance transmission capability and the anti-interference capability of the signal cable under the complex operation condition of the rail transit are solved.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a low inductance track traffic signal cable is provided, lower inductance and capacitance value not only have, and the interference killing feature is strong moreover, signal transmission safe and reliable.

In order to solve the technical problem, the utility model discloses a low inductance track traffic signal cable, including the cable core to and constitute a plurality of star quad slit of cable core, star quad slit is twisted by four low inductance insulation heart yearns and forms, and this low inductance insulation heart yearn includes the heart yearn fibre bundle that is located central point, from inside to outside cladding in proper order on heart yearn fibre bundle has inner conductor, foam insulation layer, outer conductor, heart yearn insulation band and heart yearn shielding layer, has laid the drain wire along length direction between heart yearn insulation band and heart yearn shielding layer; the cable core is coated with a cable core insulating wrapping tape, and the cable core insulating wrapping tape is sequentially coated with an inner protection layer, a cable core shield and an outer protection layer outwards.

In the structure, the star-shaped four-wire group forming the cable core is formed by twisting four low-inductance insulation core wires, the low-inductance insulation core wires adopt an inner layer conductor structure and an outer layer conductor structure, a foam insulation layer is arranged between the inner conductor and the outer conductor, the two layers of conductors which are oppositely arranged can transmit electric signals, a corresponding inductance surface is formed between the two layers of conductors, and the inductance value of the cable core wires is effectively reduced. And because the foam insulating layer is adopted between the inner conductor and the outer conductor, the dielectric constant is reduced through a foaming layer structure, the unbalance value of the line pair conductor capacitance and the capacitance to the ground is reduced, and the performance requirements of low capacitance, low inductance, low attenuation and long-distance signal transmission are met. And because the core wire fiber bundle is arranged at the center of the core wire of the low-inductance insulated wire, the structure increases the diameter of the inner conductor on one hand and enhances the tensile strength and the core wire flexibility of the core wire on the other hand. Drainage wires are arranged between the core wire insulating wrapping tape and the core wire shield, and the drainage wires in each star-shaped four-wire group have the function of dispatching induced lightning current. The utility model discloses a cladding has cable core insulation band, interior sheath, cable core shielding layer and outer jacket on the cable core in proper order, and this kind of comprehensive sheath structure makes the cable have fine insulating properties, shielding property and protection security for the cable has comprehensive properties such as good electricity and machinery, and inductance, electric capacity that had both effectively reduced the cable guarantees the safe and reliable transmission of signal again.

In a preferred embodiment of the present invention, the core fiber bundle is formed by twisting chemical fiber filaments. Has the advantages of high tensile strength and high flexibility.

The utility model discloses a preferred embodiment, inner conductor and outer conductor are woven by the soft round copper wire of stranded and are formed. The weaving density of the soft round copper wires of the inner conductor and the outer conductor is 92% -96%. The adoption of the braided structure is beneficial to reducing the inductance and improving the conductivity.

In the preferred embodiment of the utility model, the core wire shielding layer is formed by longitudinally wrapping an aluminum-plastic composite shielding belt; the foaming degree of the foam insulation layer is 70% -80%. The insulating layer adopts high foaming degree, so that the coaxial capacitance of the core wire is effectively reduced, the blocking effect of the capacitance and the inductance on an effective variable electric field in a circuit is weakened, and the transmission quality is improved.

The utility model discloses a preferred embodiment, the group shielding layer is formed by the compound shielding area package of plastic-aluminum. The cable core shielding layer is a net-shaped braided shielding layer. The overlapping amount of the wrapping tapes of the cable core insulating wrapping tape is 10% -15% of the tape width, and the outer protective layer is a polyurethane mixture extrusion coating layer. Has excellent shielding performance and stable mechanical and physical performance.

Drawings

The low inductance track traffic signal cable of the present invention will be described in further detail with reference to the accompanying drawings and the following detailed description.

Fig. 1 is a schematic cross-sectional structure diagram of an embodiment of the low inductance rail transit signal cable of the present invention;

fig. 2 is a schematic cross-sectional view of the low inductance insulated core of the embodiment shown in fig. 1.

In the figure, 1-star quad, 2-low inductance insulation core, 21-core fiber bundle, 22-inner conductor, 23-foam insulation layer, 24-outer conductor, 25-core insulation tape, 26-core shielding layer, 3-low dielectric constant insulation tape, 4-wire group shielding layer, 5-polyester binding yarn, 6-cable core insulation tape, 7-inner protection layer, 8-cable core shielding layer, 9-outer protection layer and 10-drainage wire.

Detailed Description

As shown in fig. 1, the cable core of the low-inductance track traffic signal cable is composed of four star-shaped four-wire groups, each star-shaped four-wire group 1 is formed by twisting four low-inductance insulation core wires 2, and the four low-inductance insulation core wires 2 are sequentially coated with a low-dielectric-constant insulation tape 3, a wire group shielding layer 4 and polyester binder yarns 5; the wire group shielding layer 4 is formed by lapping an aluminum-plastic composite shielding tape. The cable core of the cable is coated with a cable core insulating tape 6, and the overlapping amount of the tape of the cable core insulating tape 6 is controlled to be 10-15%. The cable core insulation belting 6 is a foamed PP belt coated outside the cable core, the thickness of the foamed PP belt is 0.2mm, the foamed PP belt has good insulation performance, and the foamed PP belt also has good elasticity and flexibility, so that the impact damage effect of external force on the cable core can be effectively reduced. The cable core insulating belting 6 is coated with the inner protection layer 7, the inner protection layer 7 is formed by continuously extruding black linear low-density polyethylene sheath materials, and the linear low-density polyethylene sheath materials have good mechanical and physical properties and good flexibility. The inner sheath 7 is provided with a cable core shielding layer 8, the cable core shielding layer 8 is formed by weaving soft round copper wires or tinned soft copper wires, and the weaving density is controlled to be 70% -80%. An outer protective layer 9 formed by extruding and wrapping a polyester mixture is extruded and wrapped on the cable core shielding layer 8, and the thickness of the outer protective layer 9 is 1.2mm, so that the cable core shielding layer has the characteristics of wear resistance and corrosion resistance.

As shown in fig. 2, the low inductance insulation core wire 2 has a core fiber bundle 21 at the center, the core fiber bundle 21 is made of chemical fibers such as polyester filament, an inner conductor 22 is wrapped around the core fiber bundle 21, the inner conductor 22 is woven from soft round copper wire, a foam insulation layer 23 is extruded from the inner conductor 22, the foam insulation layer 23 is made by physical foaming or chemical foaming, the foaming degree is controlled at 75%, an outer conductor 24 is wrapped on the foam insulation layer 23, and the outer conductor 24 is also woven from soft round copper wire. The braid density of the inner and

outer conductors

22, 24 is 95%. The outer conductor 24 is wrapped with a core wire insulating wrapping tape 25, the core wire insulating wrapping tape 25 is wrapped with a core wire shielding layer 26, and the core wire shielding layer 26 is formed by wrapping an aluminum-plastic composite shielding foil tape. The drainage wire 10 of the round copper wire structure is arranged between the core wire insulating tape 25 and the core wire shielding layer 26 of each low-inductance insulating core wire 2.

The foregoing has outlined some of the preferred embodiments of the present invention but the invention is not limited thereto and various modifications and changes may be made without departing from the general principles of the invention. If the star-shaped four-wire groups in the cable core are not limited to four groups, the star-shaped four-wire groups can be selected into a plurality of groups according to actual conditions; the braid density of the inner and outer conductors is also not limited to 95%, but should preferably be between 92% and 96%; the degree of foaming of the insulating layer of the foamed insulating layer is preferably 70% to 80%. And the like, all falling within the scope of the present invention.

Claims

1. A low-inductance track traffic signal cable comprises a cable core and a plurality of star-shaped four-wire groups (1) forming the cable core, and is characterized in that the star-shaped four-wire groups (1) are formed by twisting four low-inductance insulation core wires (2), the low-inductance insulation core wires (2) comprise core wire fiber bundles (21) positioned at the center, inner conductors (22), foam insulation layers (23), outer conductors (24), core wire insulation belting (25) and core wire shielding layers (26) are sequentially coated on the core wire fiber bundles (21) from inside to outside, and drainage wires (10) are arranged between the core wire insulation belting (25) and the core wire shielding layers (26) along the length direction; the cable core is coated with a cable core insulating wrapping tape (6), and the cable core insulating wrapping tape (6) is sequentially coated with an inner protection layer (7), a cable core shielding layer (8) and an outer protection layer (9) outwards.

2. The low inductance rail transit signal cable of claim 1, wherein: the core wire fiber bundle (21) is formed by stranding chemical fiber filaments.

3. The low inductance rail transit signal cable of claim 1, wherein: the inner conductor (22) and the outer conductor (24) are formed by weaving a plurality of strands of soft round copper wires.

4. The low inductance rail transit signal cable of claim 3, wherein: the weaving density of the soft round copper wires of the inner conductor (22) and the outer conductor (24) is 92% -96%.

5. The low inductance rail transit signal cable of claim 1, wherein: the core wire shielding layer (26) is formed by longitudinally wrapping an aluminum-plastic composite shielding tape; the foaming degree of the foam insulation layer (23) is 70% -80%.

6. The low inductance rail transit signal cable of claim 1, wherein: the cable core shielding layer (8) is a net-shaped braided shielding layer.

7. The low inductance rail transit signal cable of claim 1, wherein: the overlapping amount of the cable core insulating wrapping tape (6) is 10% -15% of the tape width, and the outer protective layer (9) is a polyurethane mixture extrusion coating layer.