Directly-buried fireproof cable

Abstract

The utility model relates to a directly-buried fireproof cable comprising an outer sheath, the inner layer of the outer sheath is provided with a first metal reinforcing layer, the inner layer of the first metal reinforcing layer is provided with a second metal reinforcing layer, and the inner layer of the second metal reinforcing layer is provided with a first insulating layer. According to the fireproof cable capable of being directly buried, the first metal reinforcing layer and the second metal reinforcing layer are arranged, and when the fireproof cable is used, two metal reinforcing layers are synchronously arranged outside the main wire bodies, so that the hardness of the cable can be further improved, mice are difficult to bite through the metal reinforcing layers, and the purpose of protecting the cable core is achieved; the metal shielding layer is made of a copper-clad iron composite metal wire braided structure, the inner layer is made of iron alloy, and the outer layer is a copper layer, so that the main wire bodies and the wire core bodies can be separated, an interference electromagnetic field is weakened, mutual interference and external interference between the main wire bodies and the wire core bodies are effectively reduced, and the service life of the main wire bodies and the wire core bodies is prolonged. Therefore, the signal transmission performance of the cable is not affected at all.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a directly buried fireproof cable. Background Art

[0002] The use of direct buried cables during cable installation will definitely play a positive role in promoting the telecommunications industry, because it is safe, reliable, does not occupy land, and has good economic effects; however, since direct buried cables are directly buried in the soil, their compression and shear resistance requirements are relatively high. Because the scope of use involved does not allow interruptions, if interruptions occur, it will cause serious economic losses and have an impact on major industries.

[0003] According to a waterproof direct-buried photovoltaic cable mentioned in the utility model patent with Chinese patent application number 201921104612.X, the waterproof direct-buried photovoltaic cable has excellent water-blocking, fire-proof and corrosion-resistant properties when in use. However, the waterproof direct-buried photovoltaic cable will affect the effect of cable signal transmission after being buried in the ground, resulting in instability in signal transmission when the cable is directly buried and installed. Therefore, it is necessary to propose a direct-buried fireproof cable to solve the above-mentioned problems. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a fireproof cable that can be directly buried and does not affect the transmission of cable signals when directly buried.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a directly buried fireproof cable, comprising an outer sheath, the inner layer of the outer sheath is provided with a first metal reinforcement layer, the inner layer of the first metal reinforcement layer is provided with a second metal reinforcement layer, the inner layer of the second metal reinforcement layer is provided with a first insulating layer, the inner layer of the first insulating layer is provided with a fireproof layer, the interior of the fireproof layer is provided with a main line body, the interior of the main line body is provided with a wire core body, the wire core body is provided with an epoxy resin layer, a metal shielding layer and a second insulating layer in sequence from the inside to the outside, and the inner layer of the outer sheath is provided with a heat insulation layer.

[0006] Furthermore, a first filling layer is filled between the main line body and the fireproof layer, and the first filling layer is made of mineral material.

[0007] Furthermore, the first metal reinforcement layer and the second metal reinforcement layer are both steel strips, and the outer sheath is made of black high-density polyethylene material.

[0008] Furthermore, there are four groups of main line bodies, the four groups of main line bodies are parallel to each other, and a reinforcing core is arranged in the middle of the four groups of main line bodies, and the reinforcing core is made of steel wire rope.

[0009] Furthermore, the thermal insulation layer is made of silicone rubber.

[0010] Furthermore, the first insulating layer and the second insulating layer are both made of plastic PVC.

[0011] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0012] The direct-buried fireproof cable is provided with a first metal reinforcement layer and a second metal reinforcement layer. When in use, two metal reinforcement layers are simultaneously provided on the outside of a plurality of main line bodies, so that the hardness of the cable can be further increased, making it difficult for rodents to bite through the metal reinforcement layer, thereby achieving the purpose of protecting the cable core; and a heat insulation layer is provided, and the heat insulation layer is made of silicone rubber. Silicone rubber is a material with high thermal stability and good flame retardancy, which can withstand high temperatures (the operating temperature at room temperature is -60°C to +200°C), has excellent anti-aging performance, and can maintain good flexibility, thereby protecting the stability of the operation of the main line body and the line core body; by A metal shielding layer is provided. The material of the metal shielding layer is a copper-clad iron composite metal wire braided structure. The inner layer is an iron alloy and the outer layer is a copper layer. When in use, it can separate each main line body and the wire core body, so that the interference electromagnetic field is weakened, and the mutual interference and external interference between each main line body and the wire core body are effectively reduced. It can also absorb and reflect electromagnetic waves from the outside, thereby preventing them from interfering with the cable transmission signal, so that the signal transmission performance of the cable is not affected in any way, which solves the problem that the cable will affect the cable signal transmission after being buried in the ground, resulting in unstable signal transmission when the cable is directly buried and installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a three-dimensional diagram of the fireproof cable structure of the utility model;

[0014] Figure 2 For this utility model Figure 1 A magnified view of the structure at center;

[0015] Figure 3 This is a cross-sectional view of the main body structure of the utility model.

[0016] In the figure: 1. outer sheath; 2. first metal reinforcement layer; 3. second metal reinforcement layer; 4. first insulation layer; 5. fireproof layer; 6. first filling layer; 7. main line body; 701. wire core body; 703. epoxy resin layer; 704. metal shielding layer; 705. second insulation layer; 8. reinforcement core; 9. thermal insulation layer. DETAILED DESCRIPTION

[0017] 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.

[0018] See also Figure 1-3 The direct-buried fireproof cable in this embodiment includes an outer sheath 1, the inner layer of the outer sheath 1 is provided with a first metal reinforcement layer 2, the inner layer of the first metal reinforcement layer 2 is provided with a second metal reinforcement layer 3, the inner layer of the second metal reinforcement layer 3 is provided with a first insulating layer 4, the inner layer of the first insulating layer 4 is provided with a fireproof layer 5, the interior of the fireproof layer 5 is provided with a main line body 7, the interior of the main line body 7 is provided with a wire core body 701, the wire core body 701 is provided with an epoxy resin layer 703, a metal shielding layer 704 and a second insulating layer 705 from the inside to the outside, and the inner layer of the outer sheath 1 is provided with a heat insulation layer 9.

[0019] In specific implementation, the first filling layer 6 and the second filling layer 702 are filled inside the cable. The first filling layer 6 and the second filling layer 702 are both made of mineral materials. The mineral materials are used in the cable to fill the defects inside the cable, making the internal structure of the cable more complete, avoiding corrosion, thermal expansion and contraction inside the cable, and avoiding gaps between the main line bodies 7 that affect the stability of the main line body 7 during use.

[0020] By setting the first metal reinforcement layer 2 and the second metal reinforcement layer 3, when in use, by synchronously setting two layers of metal reinforcement layers on the outside of multiple main line bodies 7, the hardness of the cable can be further increased, making it difficult for rodents to bite through the metal reinforcement layers, thereby achieving the purpose of protecting the cable core.

[0021] A heat insulation layer 9 is also provided, and the heat insulation layer 9 is made of silicone rubber. Silicone rubber is a material with high thermal stability and good flame retardancy. It can withstand high temperatures (the operating temperature at room temperature is -60°C to +200°C), and has excellent anti-aging properties. At the same time, it can maintain good flexibility and protect the stability of the main line body 7 and the line core body 701.

[0022] By setting a metal shielding layer 704, the material of the metal shielding layer 704 is a copper-clad iron composite metal wire braided structure, the inner layer is an iron alloy, and the outer layer is a copper layer. When in use, it can separate each main line body 7 and the wire core body 701, so that the interference electromagnetic field is weakened, and the mutual interference and external interference between each main line body 7 and the wire core body 701 are effectively reduced. It can also absorb and reflect electromagnetic waves from the outside, thereby preventing them from interfering with the cable transmission signal, so that the signal transmission performance of the cable is not affected in any way, which solves the problem that the cable will affect the cable signal transmission after being buried in the ground, resulting in unstable signal transmission when the cable is directly buried and installed.

[0023] When implementing, follow these steps:

[0024] 1) The first metal reinforcement layer 2 and the second metal reinforcement layer 3 are provided to increase the hardness of the cable, making it difficult for rodents to bite through the metal reinforcement layer, thereby achieving the purpose of protecting the cable core;

[0025] 2) Then, by providing a heat insulation layer 9, the cable has better anti-aging ability;

[0026] 3) The metal shielding layer 704 is provided to prevent the main lines 7 from interfering with each other and thus not affecting the signal transmission effect of the cable;

[0027] 4) Finally, by providing the first filling layer 6 and the second filling layer 702, corrosion and thermal expansion and contraction inside the cable can be avoided.

[0028] In summary, the direct-buried fireproof cable, by providing a first metal reinforcement layer 2 and a second metal reinforcement layer 3, when in use, by synchronously providing two layers of metal reinforcement layers on the outside of multiple main line bodies 7, can further increase the hardness of the cable, making it difficult for rodents to bite through the metal reinforcement layer, thereby achieving the purpose of protecting the cable core; and a heat insulation layer 9 is provided, and the heat insulation layer 9 is made of silicone rubber. Silicone rubber is a material with high thermal stability and good flame retardant properties. It can withstand high temperatures (the operating temperature at room temperature is -60°C to +200°C), has excellent anti-aging properties, and can maintain good flexibility to protect the stability of the main line body 7 and the core body 701; by A metal shielding layer 704 is provided. The material of the metal shielding layer 704 is a copper-clad iron composite metal wire braided structure, the inner layer is an iron alloy, and the outer layer is a copper layer. When in use, it can separate each main line body 7 and the wire core body 701, so that the interference electromagnetic field is weakened, and the mutual interference and external interference between each main line body 7 and the wire core body 701 are effectively reduced. It can also absorb and reflect electromagnetic waves from the outside, thereby preventing them from interfering with the cable transmission signal, so that the signal transmission performance of the cable is not affected in any way, which solves the problem that the cable will affect the cable signal transmission after being buried in the ground, resulting in unstable signal transmission when the cable is directly buried and installed.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] 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 direct-buried fireproof cable, comprising an outer sheath (1), characterized in that: The inner layer of the outer sheath (1) is provided with a first metal reinforcement layer (2), the inner layer of the first metal reinforcement layer (2) is provided with a second metal reinforcement layer (3), the inner layer of the second metal reinforcement layer (3) is provided with a first insulation layer (4), the inner layer of the first insulation layer (4) is provided with a fireproof layer (5), a main line body (7) is provided inside the fireproof layer (5), a wire core body (701) is provided inside the main line body (7), the wire core body (701) is provided with an epoxy resin layer (703), a metal shielding layer (704) and a second insulation layer (705) in sequence from the inside to the outside, and the inner layer of the outer sheath (1) is provided with a heat insulation layer (9).

2. The direct-buried fireproof cable according to claim 1, characterized in that: A first filling layer (6) is filled between the main line body (7) and the fireproof layer (5), and the first filling layer (6) is made of mineral material.

3. The direct-buried fireproof cable according to claim 1, characterized in that: The first metal reinforcement layer (2) and the second metal reinforcement layer (3) are both steel strips, and the outer sheath (1) is made of black high-density polyethylene material.

4. The direct-buried fireproof cable according to claim 1, characterized in that: The number of the main line bodies (7) is four groups, the four groups of the main line bodies (7) are parallel to each other, and a reinforcing core (8) is arranged in the middle of the four groups of the main line bodies (7), and the reinforcing core (8) is made of steel wire rope.

5. The direct-buried fireproof cable according to claim 1, characterized in that: The heat insulation layer (9) is made of silicone rubber.

6. The direct-buried fireproof cable according to claim 1, characterized in that: The first insulating layer (4) and the second insulating layer (705) are both made of plastic PVC.

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