Multi-cable-core cross-linked polyethylene insulated metal shielding flame-retardant power cable

Abstract

The utility model discloses a multi-cable-core cross-linked polyethylene insulated metal shielding flame-retardant power cable which sequentially comprises an outer sheath, a shielding layer and a wrapping layer from outside to inside, a tensile unit, a plurality of cable cores and a plurality of pressure-resistant supporting units are arranged in the wrapping layer, the outer sheath is made of a polyvinyl chloride material, the shielding layer is a copper wire braided shielding layer, and the tensile unit, the cable cores and the pressure-resistant supporting units are arranged in the wrapping layer. The wrapping layer is a mica tape wrapping layer, the insulating layer is a crosslinked polyethylene insulating layer, and the inner sheath is a low-smoke halogen-free inner sheath. According to the power cable, the number of the cable cores is large, the number of devices capable of being connected is large, more power can be transmitted at the same time, and the power transmission effect is good; and gaps are formed between the arc-shaped supporting plate units and the corresponding cable cores, and the hollow pressure-resistant pipe is matched, so that enough buffer space is provided, and the pressure-resistant effect of the cable is good.

Description

Technical Field

[0001] The utility model relates to the field of cables, and more specifically to a multi-cable core cross-linked polyethylene insulated metal shielded flame-retardant power cable. Background Art

[0002] The main function of power cables is to transmit electric energy to the destination stably and safely. Power cables are widely used in various fields, including energy, transportation, information and communication, construction, railways, urban rail transit, automobiles, aviation, metallurgy, petrochemicals, etc. With the development of society, the demand for power cables in the fields of communication networks, power grid construction, transportation, etc. will continue to grow rapidly.

[0003] The existing power cables have a small number of cable cores, which limits the transmission capacity of the cables. When there are many devices that need to be connected, if the number of cable cores is insufficient, it may not be able to meet the connection requirements of all devices, and more cables need to be used for connection, which not only takes up space but also increases costs. In addition, ordinary power cables have no supporting structure and poor pressure resistance. When the cable is subjected to external pressure, its insulation layer may rupture due to inability to withstand the pressure, resulting in the exposure of the internal conductor, thereby causing short circuits, leakage and other faults. Cables without supporting structures may be deformed by their own weight and external forces during installation and operation, resulting in cable bending, flattening, etc. These deformations will change the electrical and mechanical properties of the cable and affect its ability to transmit electrical energy normally. Utility Model Content

[0004] The utility model aims to overcome the defects of the prior art and provides a multi-cable core cross-linked polyethylene insulated metal shielded flame-retardant power cable.

[0005] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a power cable, comprising an outer sheath, a shielding layer and a wrapping layer from the outside to the inside, wherein a tensile unit, a plurality of cable cores and a plurality of pressure-resistant support units are arranged in the wrapping layer, wherein the cross section of the cable core is an equilateral triangle with an arc chamfer, wherein the cable core comprises an inner sheath and a plurality of core wires located in the inner sheath, wherein the core wires comprise a conductor and an insulating layer covering the conductor, wherein the tensile unit comprises a tensile rope and a tensile rope wrapping covering the tensile rope, wherein the tensile rope wrapping has a plurality of accommodating grooves capable of accommodating the cable core, and wherein the outer sheath is made of polyvinyl chloride. The shielding layer is a copper wire braided shielding layer, the wrapping layer is a mica tape wrapping layer, the insulating layer is a cross-linked polyethylene insulating layer, and the inner protective layer is a low-smoke halogen-free inner protective layer; the number of the pressure-resistant support units is equal to and corresponds to the cable cores, and the pressure-resistant support unit includes a hollow pressure-resistant tube, an arc-shaped support plate unit, and a limit plug unit fixedly connected to the arc-shaped support plate unit, and a gap is provided between the arc-shaped support plate unit and the corresponding cable core, and the inner protective layer of the cable core has a slot, and each slot has one of the hollow pressure-resistant tubes, and the limit plug unit can be inserted into the slot and can abut against the hollow pressure-resistant tube.

[0006] Furthermore, both ends of the arc-shaped supporting plate unit have abutting planes capable of abutting against the cable core.

[0007] Therefore, the arc-shaped support plate unit provides good support for the cable core and reduces damage to the cable core.

[0008] Furthermore, the cable cores are provided with six, the tensile rope sheath has six accommodating grooves, and the six cable cores are respectively accommodated in the six accommodating grooves.

[0009] Thereby, the six cable cores are evenly distributed into the six receiving grooves of the tensile rope sheath, thereby enhancing the stability of the cable structure.

[0010] Furthermore, the hollow pressure-resistant tube is a rubber tube.

[0011] Therefore, the cable has good voltage resistance.

[0012] Furthermore, the end of the cross section of the limiting plug plate unit is semicircular.

[0013] This reduces the wear on the hollow pressure-resistant tube.

[0014] Furthermore, the arc-shaped supporting plate unit and the limiting plug plate unit both extend along the length direction of the cable.

[0015] Therefore, the arc-shaped support plate unit can provide continuous and uniform support for the cable core, and the limit plug plate unit can be firmly inserted into the slot of the inner sheath of the cable core and tightly abut against the hollow pressure-resistant tube.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The power cable of the present application has a large number of cable cores, can connect many devices, can transmit more power at the same time, and has a good power transmission effect.

[0018] 2. The power cable of the present application has a gap between the arc-shaped support plate unit and the corresponding cable core, and has sufficient buffer space when combined with the hollow pressure-resistant tube, so that the cable has a good pressure-resistant effect.

[0019] 3. The power cable of the present application adopts a mica tape sheath, which has good high temperature resistance, can effectively prevent the cable from burning when the cable is overloaded or short-circuited, and improve the flame retardant performance of the cable; it adopts a low-smoke halogen-free inner sheath to reduce the release of toxic gases when the cable burns, thereby improving the safety of the cable.

[0020] 4. In the power cable of the present application, the tensile unit enhances the tensile performance of the cable, and the cable core is accommodated in the accommodating groove, thereby enhancing the structural stability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the power cable from the first perspective;

[0022] Figure 2 This is an enlarged view of area A;

[0023] Figure 3 This is a schematic diagram of the power cable from the second perspective.

[0024] Explanation of the reference numerals: 1 outer sheath; 2 shielding layer; 3 winding layer; 4 tensile unit; 4.1 tensile rope; 4.2 tensile rope sheath; 5.1 conductor; 5.2 insulating layer; 5.3 inner sheath; 5.3.1 slot; 6 hollow pressure-resistant tube; 7 arc-shaped support plate unit; 8 limit plug-in unit. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0026] The utility model provides Figure 1-3A multi-cable core cross-linked polyethylene insulated metal shielded flame-retardant power cable is shown, which comprises an outer sheath 1, a shielding layer 2 and a wrapping layer 3 from the outside to the inside, wherein a tensile unit 4, a plurality of cable cores and a plurality of pressure-resistant support units are arranged in the wrapping layer 3, wherein the cross section of the cable core is an equilateral triangle with an arc chamfer, wherein the cable core comprises an inner sheath 5.3 and a plurality of core wires located in the inner sheath 5.3, wherein the core wire comprises a conductor 5.1 and an insulating layer 5.2 covering the conductor 5.1, wherein the tensile unit 4 comprises a tensile rope 4.1 and a tensile rope sheath 4.2 covering the tensile rope 4.1, wherein the tensile rope sheath 4.2 has a plurality of accommodating grooves capable of accommodating the cable core, and wherein the outer sheath 1 is made of polyvinyl chloride. The cable core is made of ethylene material, the shielding layer 2 is a copper wire braided shielding layer, the wrapping layer 3 is a mica tape wrapping layer, the insulating layer 5.2 is a cross-linked polyethylene insulating layer, and the inner protective layer 5.3 is a low-smoke halogen-free inner protective layer; the number of the pressure-resistant support units is equal to and corresponds to the cable cores, the pressure-resistant support unit includes a hollow pressure-resistant tube 6, an arc-shaped support plate unit 7 and a limiting plug-in unit 8 fixedly connected to the arc-shaped support plate unit 7, a gap is provided between the arc-shaped support plate unit 7 and the corresponding cable core, the inner protective layer 5.3 of the cable core has a slot 5.3.1, each slot has a hollow pressure-resistant tube 6, and the limiting plug-in unit 8 can be inserted into the slot and can abut the hollow pressure-resistant tube 6.

[0027] Both ends of the arc-shaped support plate unit 7 have abutment planes that can abut the cable core; there are 6 cable cores, and the anti-tensile rope sheath 4.2 has 6 accommodating grooves, and the 6 cable cores are respectively accommodated in the 6 accommodating grooves; the hollow pressure-resistant tube 6 is a rubber tube; the end of the cross-section of the limiting plug plate unit 8 is semicircular; the arc-shaped support plate unit 7 and the limiting plug plate unit 8 both extend along the length direction of the cable.

[0028] Working principle: The power cable of the present application has a large number of cable cores, can connect many devices, can transmit more electricity at the same time, and has a good power transmission effect. Each cable core has a pressure-resistant support unit. There is a gap between the arc-shaped support plate unit and the corresponding cable core. In conjunction with the hollow pressure-resistant tube, there is sufficient buffer space, so that the cable has a good pressure-resistant effect. The mica tape sheath has good high-temperature resistance, can effectively prevent the cable from burning when the cable is overloaded or short-circuited, and improves the flame retardant performance of the cable; the low-smoke halogen-free inner sheath is used to reduce the release of toxic gases when the cable burns, thereby improving the safety of the cable. The tensile unit enhances the tensile performance of the cable, and the cable core is accommodated in the accommodating groove, which enhances the structural stability of the cable.

[0029] During the specific assembly, first match the 6 cable cores with the tensile unit so that each cable core is accommodated in the corresponding accommodating groove, then insert the hollow pressure-resistant tube into the corresponding slot, then insert the limit plug plate unit into the slot and abut the hollow pressure-resistant tube, and make the two ends of the arc support plate unit abut the cable core, then use mica tape to wrap the pressure-resistant support unit and the cable core to form a wrapping layer, and then make a copper wire braided shielding layer outside the mica tape wrapping layer, so as to enhance the shielding performance of the cable and reduce the influence of external electromagnetic interference on the cable signal, and finally, make an outer sheath to protect the entire cable structure.

[0030] Although the present invention has been illustrated and described with respect to preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made to the present invention without departing from the scope of the present invention as defined by the claims.

Claims

1. A multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable, characterized in that: From the outside to the inside, it includes an outer sheath, a shielding layer and a wrapping layer, wherein a tensile unit, a plurality of cable cores and a plurality of pressure-resistant support units are arranged in the wrapping layer, and the cross section of the cable core is an equilateral triangle with an arc chamfer, and the cable core includes an inner sheath and a plurality of core wires located in the inner sheath, and the core wires include a conductor and an insulating layer covering the conductor, and the tensile unit includes a tensile rope and a tensile rope wrapping layer covering the tensile rope, and the tensile rope wrapping layer has a plurality of accommodating grooves capable of accommodating the cable core, and the outer sheath is made of polyvinyl chloride, and the shielding layer is a copper wire braided shielding layer, the wrapping layer is a mica tape wrapping layer, the insulating layer is a cross-linked polyethylene insulating layer, and the inner protective layer is a low-smoke halogen-free inner protective layer; the number of the pressure-resistant support units is equal to and corresponds to the cable cores, the pressure-resistant support unit comprises a hollow pressure-resistant tube, an arc-shaped support plate unit and a limiting plug-in unit fixedly connected to the arc-shaped support plate unit, a gap is provided between the arc-shaped support plate unit and the corresponding cable core, the inner protective layer of the cable core has a slot, each slot has one of the hollow pressure-resistant tubes, and the limiting plug-in unit can be inserted into the slot and can abut against the hollow pressure-resistant tube.

2. The multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable according to claim 1, characterized in that: Both ends of the arc-shaped supporting plate unit have abutting planes capable of abutting against the cable core.

3. The multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable according to claim 1, characterized in that: The cable cores are six in number, the tensile rope sheath is provided with six accommodating grooves, and the six cable cores are respectively accommodated in the six accommodating grooves.

4. The multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable according to claim 1, characterized in that: The hollow pressure-resistant tube is a rubber tube.

5. The multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable according to claim 1, characterized in that: The end of the cross section of the limiting plug plate unit is semicircular.

6. The multi-core cross-linked polyethylene insulated metal shielded flame-retardant power cable according to claim 1, characterized in that: The arc-shaped supporting plate unit and the limiting plug plate unit both extend along the length direction of the cable.

Images