Halogen-free polyolefin low-voltage insulated cable with good shielding effect

Abstract

The utility model discloses a halogen-free polyolefin low-voltage insulated cable with a good shielding effect, which comprises wires, each wire comprises a wire core and a first insulating layer arranged on the outer side of the wire core, the wires are stranded, supports used for supporting and isolating the wires are arranged among the wires, and the first insulating layer is arranged on the outer side of the wire core. The support is twisted along the twisting track of the wires, the outer sides of the wires and the support are filled with the filling layer, the outermost layer of the filling layer is provided with the outer sheath, the outer sheath is arranged in two layers, the connecting layer is integrally arranged between the two outer sheath layers, and through the first shielding layer and the second shielding layer, the cable can be shielded by the first shielding layer and the second shielding layer. The shielding effect of the halogen-free polyolefin low-voltage insulated cable is improved, the thickness of the outer sheath is reduced under the action of the two outer sheaths connected through the connecting layer, and meanwhile the overall hardness of the outer sheath can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage insulated cables, in particular to a halogen-free polyolefin low-voltage insulated cable with good shielding effect. Background Art

[0002] Low-voltage cables are made of one or more mutually insulated conductors wrapped with insulation and protective layers. They are wires that transmit electricity or information from one place to another. Among them, halogen-free polyolefins are mostly used as materials for low-voltage cables. Halogen-free polyolefins can avoid the phenomenon of insulation shrinkage and copper leakage after the wires are cut due to customers using automatic wire cutting machines. Therefore, halogen-free polyolefins are widely used in low-voltage insulated cables.

[0003] Most existing low-voltage cables have a shielding layer on the outermost side of the cable, resulting in a large amount of shielding layers such as copper foil shielding tape being used. At the same time, when one shielding layer is used, the misalignment of the copper foil shielding tape winding will reduce the shielding effect. At the same time, a thick halogen-free polyolefin outer sheath is provided on the outside of the cable, which increases the amount of halogen-free polyolefin used and causes the hardness of the outer sheath to be greater. Utility Model Content

[0004] The utility model aims to provide a halogen-free polyolefin low-voltage insulated cable with good shielding effect, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a halogen-free polyolefin low-voltage insulated cable with good shielding effect, comprising a conductor, the conductor comprising a core and a first insulating layer arranged on the outside of the core, the conductors are twisted, and a bracket for supporting and isolating the conductors is installed between a plurality of the conductors, the bracket is twisted along the twisting trajectory of the conductor, the conductor and the outside of the bracket are filled with a filling layer, the outermost layer of the filling layer is provided with an outer sheath, the outer sheath is arranged in two layers, and a connecting layer is integrally arranged between the two layers of the outer sheath.

[0006] As a further preferred embodiment of the present technical solution, an inner sheath is provided on the outer side of the filling layer, a first shielding layer is provided on the outer side of the inner sheath, an armor layer is provided on the outer side of the first shielding layer, a second shielding layer is provided on the outer side of the armor layer, a second insulating layer is provided on the outer side of the second shielding layer, a waterproof buffer layer is provided on the outer side of the second insulating layer, and both the first insulating layer and the second insulating layer are made of halogen-free polyolefin material.

[0007] As a further preferred embodiment of the present technical solution, the wire is arranged close to the middle part of the bracket.

[0008] As a further preferred embodiment of the present technical solution, the connecting layer is arranged obliquely.

[0009] As a further preferred embodiment of the present technical solution, a steel wire is provided in the middle of the inner sheath.

[0010] As a further preferred embodiment of the present technical solution, a groove is provided on the outer side of the filling layer along the transverse trajectory of the filling layer, and a raised strip is integrally provided on the inner side of the inner sheath along the transverse trajectory of the inner sheath, and the raised strip is integrated with the filling layer when the filling layer is cast.

[0011] As a further preferred embodiment of the present technical solution, the first shielding layer and the second shielding layer are both formed by winding copper foil shielding tape.

[0012] The utility model provides a halogen-free polyolefin low-voltage insulated cable with good shielding effect, which has the following beneficial effects:

[0013] (1) The utility model shields the wire from external signal interference through the first shielding layer, and then increases the tensile and compressive strength of the cable under the action of the armor layer, thereby extending the service life of the cable. A second shielding layer is arranged on the outside of the armor layer to once again shield the wire from external signal interference, thereby improving the shielding effect of the halogen-free polyolefin low-voltage insulated cable.

[0014] (2) The utility model provides two layers of outer sheaths on the outside of the waterproof buffer layer, and uses a connecting layer to connect the two layers of outer sheaths. Under the action of pressure, the two layers of outer sheaths can slide slightly relative to each other, and the two layers of outer sheaths can be reset under the action of the connecting layer. At the same time, the thickness of the outer sheaths is reduced, and the overall hardness of the outer sheaths can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0017] In the figure: 1. conductor; 2. core; 3. first insulating layer; 4. bracket; 5. filling layer; 6. outer sheath; 7. connecting layer; 8. inner sheath; 9. first shielding layer; 10. armor layer; 11. second shielding layer; 12. second insulating layer; 13. waterproof buffer layer; 14. steel wire; 15. groove; 16. raised strip. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0019] The utility model provides a technical solution: Figure 1 to Figure 2As shown, in this embodiment, a halogen-free polyolefin low-voltage insulated cable with good shielding effect includes a conductor 1, wherein the conductor 1 includes a core 2 and a first insulating layer 3 arranged on the outside of the core 2, the conductors 1 are twisted, and a bracket 4 for supporting and isolating the conductors 1 is installed between a plurality of the conductors 1, and the bracket 4 is twisted along the twisting trajectory of the conductor 1, and a filling layer 5 is filled on the outside of the conductor 1 and the bracket 4, and an outer layer of the filling layer 5 is provided with an outer sheath 6, and the outer sheath 6 is arranged in two layers, and a connecting layer 7 is integrally arranged between the two layers of the outer sheath 6.

[0020] like Figure 1 to Figure 2 As shown, an inner sheath 8 is provided on the outside of the filling layer 5, a first shielding layer 9 is provided on the outside of the inner sheath 8, an armor layer 10 is provided on the outside of the first shielding layer 9, a second shielding layer 11 is provided on the outside of the armor layer 10, a second insulating layer 12 is provided on the outside of the second shielding layer 11, a waterproof buffer layer 13 is provided on the outside of the second insulating layer 12, and both the first insulating layer 3 and the second insulating layer 12 are made of halogen-free polyolefin material.

[0021] After the filling layer 5 and the conductor 1 and the first insulating layer 3 of the inner circle of the filling layer 5 are protected by the inner sheath 8, the conductor 1 is shielded from external signal interference by the first shielding layer 9, and then the tensile and compressive strengths of the cable are increased under the action of the armor layer 10, and the service life of the cable is extended. A second shielding layer 11 is arranged on the outside of the armor layer 10 to once again shield the conductor 1 from external signal interference, thereby improving the shielding effect of the halogen-free polyolefin low-voltage insulated cable. Then, the conductor 1 is protected by the second insulating layer 12, thereby improving the insulation effect of the halogen-free polyolefin low-voltage insulated cable, and the halogen-free polyolefin low-voltage insulated cable is waterproofed by the waterproof buffer layer 13, thereby improving the insulation effect and service life of the halogen-free polyolefin low-voltage insulated cable.

[0022] like Figure 1 to Figure 2 As shown, the wire 1 is arranged close to the middle part of the bracket 4.

[0023] It is used to stably install the wire 1 on the outside of the bracket 4.

[0024] like Figure 1 to Figure 2 As shown, the connecting layer 7 is arranged obliquely.

[0025] The tilting of the connecting layer 7 improves the resetting effect of the outer sheath 6 .

[0026] like Figure 1 to Figure 2 As shown, a steel wire 14 is provided in the middle of the inner sheath 8 .

[0027] The compressive strength of the inner sheath 8 is improved.

[0028] like Figure 1 to Figure 2As shown, a groove 15 is provided on the outer side of the filling layer 5 along the transverse track of the filling layer 5, and a raised strip 16 is integrally provided on the inner side of the inner sheath 8 along the transverse track of the inner sheath 8, and the raised strip 16 is integrated with the filling layer 5 when the filling layer 5 is poured.

[0029] First, the inner sheath 8 is placed on the outside of the bracket 4, and then the filling layer 5 is poured. The filling layer 5 completely wraps the raised strip 16 to improve the stability of the installation of the filling layer 5 and the inner sheath 8.

[0030] like Figure 1 to Figure 2 As shown, the first shielding layer 9 and the second shielding layer 11 are both formed by winding copper foil shielding tape.

[0031] The utility model provides a halogen-free polyolefin low-voltage insulated cable with good shielding effect. The specific working principle is as follows:

[0032] When the device is in use, the inner sheath 8 protects the filling layer 5 and the wire 1 and the first insulating layer 3 of the inner circle of the filling layer 5, and then the first shielding layer 9 shields the wire 1 from external signal interference. Then, under the action of the armor layer 10, the tensile and compressive strengths of the cable are increased to extend the service life of the cable. A second shielding layer 11 is arranged on the outside of the armor layer 10 to shield the wire 1 from external signal interference again, thereby improving the shielding effect of the halogen-free polyolefin low-voltage insulated cable. Finally, the second insulating layer 12 provides a second layer of protection for the wire 1 to improve the halogen-free polyolefin low-voltage insulated cable. The insulation effect of the halogen-free polyolefin low-voltage insulated cable is improved, and the halogen-free polyolefin low-voltage insulated cable is waterproofed by a waterproof buffer layer 13, thereby increasing the service life of the insulation effect of the halogen-free polyolefin low-voltage insulated cable. Two layers of outer sheaths 6 are arranged on the outside of the waterproof buffer layer 13, and a connecting layer 7 is used to connect the two layers of outer sheaths 6. Under the action of pressure, the two layers of outer sheaths 6 can slide relatively to each other in a small range, and the two layers of outer sheaths 6 can be reset under the action of the connecting layer 7. At the same time, the thickness of the outer sheath 6 is reduced, and the overall hardness of the outer sheath 6 can be reduced.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A halogen-free polyolefin low-voltage insulated cable with good shielding effect, comprising a conductor (1), wherein the conductor (1) comprises a core (2) and a first insulating layer (3) arranged outside the core (2), wherein the conductors (1) are twisted together, and characterized in that: A bracket (4) for supporting and isolating the wires (1) is installed between the plurality of wires (1); the bracket (4) is twisted along the twisting trajectory of the wires (1); a filling layer (5) is filled on the outside of the wires (1) and the bracket (4); an outer sheath (6) is provided on the outermost layer of the filling layer (5); the outer sheath (6) is provided in two layers; a connecting layer (7) is provided in an integral manner between the two layers of the outer sheath (6).

2. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 1, characterized in that: An inner sheath (8) is arranged on the outer side of the filling layer (5), a first shielding layer (9) is arranged on the outer side of the inner sheath (8), an armor layer (10) is arranged on the outer side of the first shielding layer (9), a second shielding layer (11) is arranged on the outer side of the armor layer (10), a second insulating layer (12) is arranged on the outer side of the second shielding layer (11), a waterproof buffer layer (13) is arranged on the outer side of the second insulating layer (12), and both the first insulating layer (3) and the second insulating layer (12) are made of halogen-free polyolefin material.

3. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 1, characterized in that: The wire (1) is arranged close to the middle part of the bracket (4).

4. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 1, characterized in that: The connecting layer (7) is arranged in an inclined manner.

5. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 2, characterized in that: A steel wire (14) is arranged in the middle of the inner sheath (8).

6. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 2, characterized in that: The outer side of the filling layer (5) is provided with a groove (15) along the transverse track of the filling layer (5), and the inner side of the inner jacket (8) is provided with a raised strip (16) along the transverse track of the inner jacket (8), and the raised strip (16) is integrated with the filling layer (5) when the filling layer (5) is poured.

7. A halogen-free polyolefin low-voltage insulated cable with good shielding effect according to claim 2, characterized in that: The first shielding layer (9) and the second shielding layer (11) are both formed by winding copper foil shielding tape.

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