15kV single-core medium-voltage fire-resistant cable

Abstract

The utility model discloses a 15kV single-core medium-voltage fire-resistant cable, belongs to the field of cables, and solves the problem that when a cable is subjected to external pressure in the prior art, fireproof mud is flattened, and the use is greatly limited. According to the application, the cable core wire is wrapped by the cable outer wrapping layer, and the cable outer wrapping layer comprises the oxygen isolation layer and the fire blocking layer; the fire blocking layer comprises an oxygen isolating layer, and the fire blocking layer is formed by wrapping the surface of the oxygen isolating layer with fireproof mud; a plurality of strip-shaped check blocks are arranged in the fire blocking layer and annularly distributed around the oxygen isolation layer. The fireproof layer is wrapped by a second wrapping layer. And the strip-shaped baffle block and the wrapping layer II are arranged at an interval, or the strip-shaped baffle block is in contact with the wrapping layer II. According to the 15kV single-core medium-voltage fire-resistant cable, the phenomenon that the roundness of the cable is not uniform due to the fact that the fireproof mud in the fireproof layer is flattened can be prevented, in addition, an original polyolefin structure can be replaced by the current fireproof mud structure, and the cost of the cable can be reduced by about 20%.

Description

Technical Field

[0001] The utility model relates to a 15kV single-core medium-voltage fire-resistant cable, belonging to the field of cables. Background Art

[0002] In recent years, fireproof sealing materials have attracted extensive attention worldwide. As a typical organic elastic fireproof putty, fireproof mud has the advantages of long-term non-curing, good plasticity, high fire resistance limit, and low smoke emission. It is used in the fire barrier layer of cables to improve the fire resistance limit and flame retardancy of cables. However, since fireproof mud is a soft and plastic filling material, after it is filled in the oxygen isolation layer of the cable, when the cable is subjected to external pressure, the fireproof mud cannot provide good support force, and it may be flattened, which greatly limits the use of fireproof mud in cables. Content of the Utility Model

[0003] The utility model provides a 15kV single-core medium-voltage fire-resistant cable, which improves the compressive resistance of the cable while using fireproof mud.

[0004] The technical solution adopted by the utility model is a 15kV single-core medium-voltage fire-resistant cable, which includes a cable core wire, and the outside of the cable core wire is wrapped with a cable outer layer. The cable outer layer includes an oxygen isolation layer and a fire barrier layer;

[0005] The fire barrier layer includes an oxygen isolation layer, and the fire barrier layer is formed by wrapping fireproof mud on the surface of the oxygen isolation layer;

[0006] There are several strip-shaped blocks in the fire barrier layer, and the strip-shaped blocks are arranged in a ring around the oxygen isolation layer;

[0007] The outside of the fire barrier layer is wrapped with a second wrapping layer;

[0008] The strip-shaped blocks and the second wrapping layer are arranged at intervals, or the strip-shaped blocks are in contact with the second wrapping layer.

[0009] Optimally, for the above 15kV single-core medium-voltage fire-resistant cable, the length extension direction of the strip-shaped blocks is parallel to the length extension direction of the cable core wire.

[0010] Optimally, for the above 15kV single-core medium-voltage fire-resistant cable, the radial cross-sectional shape of the strip-shaped blocks is T-shaped, fan-shaped, trapezoidal or rectangular.

[0011] Optimally, for the above 15kV single-core medium-voltage fire-resistant cable, the number of the strip-shaped blocks is 10 to 15, and all the strip-shaped blocks are evenly arranged at intervals in the fire barrier layer.

[0012] Optimally, for the above 15kV single-core medium-voltage fire-resistant cable, the cable core wire includes a conductor, a conductor shield, an insulating layer, and an insulating shield; the conductor shield, the insulating layer, and the insulating shield are sequentially wrapped on the surface of the conductor from the inside out.

[0013] Optimized, for the above-mentioned 15 kV single-core medium-voltage fire-resistant cable, a buffer layer, a copper tape shield, and a wrapping layer are provided between the cable core and the oxygen barrier layer;

[0014] The buffer layer, the copper tape shield, and the wrapping layer are sequentially wrapped on the surface of the cable core from the inside out.

[0015] Optimized, the above-mentioned 15 kV single-core medium-voltage fire-resistant cable further includes a steel tape armor and an outer sheath; the steel tape armor and the outer sheath are sequentially wrapped on the outside of the second wrapping layer from the inside out.

[0016] The advantages of this application are as follows:

[0017] In the technical solution of this application, by using fireproof mud as a fire barrier layer on the basis of the original fire-resistant cable, the fire resistance limit and flame retardancy of the cable are improved. In order to prevent the fireproof mud from deforming after being compressed, strip-shaped blocks are added outside the oxygen barrier layer, which can prevent the fireproof mud in the fire barrier layer from being flattened, resulting in uneven roundness of the cable. In addition, through the current structure of the fireproof mud, the original polyolefin structure can be replaced, and the cable cost can be reduced by about 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The technical features of the present utility model will be further described below in conjunction with the drawings and specific embodiments.

[0020] As shown in the figure, the present utility model is a 15 kV single-core medium-voltage fire-resistant cable, including a conductor 1, a conductor shield 2, an insulating layer 3, an insulation shield 4, a buffer layer 5, a copper tape shield 6, a wrapping layer 7, an oxygen barrier layer 8, a fire barrier layer 9, a second wrapping layer 10, a steel tape armor 11, and an outer sheath 12.

[0021] Among them, on the surface of the conductor 1 from the inside of the cable to the surface of the cable are sequentially a conductor shield 2, an insulating layer 3, an insulation shield 4, a buffer layer 5, a copper tape shield 6, a wrapping layer 7, an oxygen barrier layer 8, a fire barrier layer 9, a second wrapping layer 10, a steel tape armor 11, and an outer sheath 12.

[0022] In this application, the fire barrier layer 9 is formed by wrapping fireproof mud on the surface of the oxygen barrier layer 8 to improve the fire and flame retardancy of the cable. In order to improve the compressive resistance of the fire barrier layer 9, a number of strip-shaped blocks 13 are provided in the fire barrier layer 9.

[0023] The strip-shaped blocks 13 are epoxy resin strips and are arranged in a ring around the oxygen barrier layer 8. In this embodiment, the strip-shaped blocks 13 are arranged at intervals from the second wrapping layer 10, or the strip-shaped blocks 13 can also be in contact with the second wrapping layer 10, and the actual arrangement form can be set according to needs.

[0024] The length extension direction of the strip-shaped block 13 is arranged parallel to the length extension direction of the cable core wire. The number of strip-shaped blocks 13 is 10 to 15, and all the strip-shaped blocks 13 are evenly spaced in the fireproof layer 9.

[0025] The radial cross-sectional shape of the strip-shaped block 13 is one of the shapes such as T-shaped, fan-shaped, trapezoidal or rectangular.

[0026] In this embodiment, the conductor shield 2 is formed by extrusion molding with a 10 kV non-peelable semi-conductive shielding material.

[0027] The insulating layer 3 is formed by extrusion molding with a 10 kV XLPE insulating material.

[0028] The insulation shield 4 is formed by extrusion molding with a 10 kV peelable semi-conductive shielding material.

[0029] The buffer layer 5 is formed by winding a semi-conductive water-blocking tape on the surface of the insulation shield 4.

[0030] The copper tape shield 6 is formed by winding a copper tape on the surface of the buffer layer 5.

[0031] The wrapping layer 7 is formed by winding a high-temperature resistant non-alkali glass fiber tape on the surface of the copper tape shield 6.

[0032] The oxygen barrier layer 8 is formed by extrusion molding with a halogen-free low-smoke flame-retardant polyolefin oxygen barrier material.

[0033] The second wrapping layer 10 is formed by winding a polyester tape + a high-temperature resistant non-alkali glass fiber tape on the surface of the oxygen barrier layer 8.

[0034] The steel tape armor 11 is formed by winding a galvanized steel tape on the surface of the second wrapping layer 10.

[0035] The outer sheath 12 is formed by extrusion molding with a halogen-free low-smoke Class A flame-retardant polyolefin sheath material.

[0036] Certainly, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above examples. Any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A 15kV single-core medium-voltage fire-resistant cable, comprising a cable core wire, the cable core wire is wrapped with a cable outer sheath, and the cable outer sheath comprises an oxygen-isolating layer (8) and a fire-blocking layer (9); characterized in that: The fire barrier layer (9) comprises an oxygen barrier layer (8), and the fire barrier layer (9) is formed by wrapping fireproof mud on the surface of the oxygen barrier layer (8); The fire barrier layer (9) has a plurality of strip-shaped blocks (13) therein, and the strip-shaped blocks (13) are arranged in a ring shape around the oxygen barrier layer (8); The fire barrier layer (9) is wrapped with a second wrapping layer (10); The strip-shaped stopper (13) is spaced apart from the second wrapping layer (10), or the strip-shaped stopper (13) is in contact with the second wrapping layer (10).

2. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: The length extension direction of the strip-shaped stopper (13) is arranged parallel to the length extension direction of the cable core wire.

3. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: The radial cross-section of the strip-shaped stopper (13) is T-shaped, fan-shaped, trapezoidal or rectangular.

4. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: The number of the strip-shaped blocks (13) is 10 to 15, and all the strip-shaped blocks (13) are evenly spaced and arranged in the fire barrier layer (9).

5. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: The cable core wire comprises a conductor (1), a conductor shield (2), an insulating layer (3), and an insulating shield (4); the conductor shield (2), the insulating layer (3), and the insulating shield (4) are sequentially wrapped around the surface of the conductor (1) from the inside to the outside.

6. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: A buffer layer (5), a copper tape shield (6), and a wrapping layer (7) are provided between the cable core wire and the oxygen isolation layer (8); The buffer layer (5), the copper tape shield (6) and the wrapping layer (7) are wrapped around the surface of the cable core wire in sequence from the inside to the outside.

7. The 15kV single-core medium voltage fire-resistant cable according to claim 1, characterized in that: It also includes a steel belt armor (11) and an outer sheath (12); the steel belt armor (11) and the outer sheath (12) are sequentially wrapped around the outside of the second wrapping layer (10) from the inside to the outside.

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