Fireproof power cable with long service life

Abstract

The utility model discloses a fireproof power cable with a long service life, comprising an inner sheath and conductors, the inner sheath is internally provided with the conductors distributed in an annular array, the outer surface of each conductor is fixedly sleeved with an insulating layer, the outer surface of each insulating layer is fixedly sleeved with a protective layer, the inner sheath is internally provided with a filling body, and the inner sheath is internally provided with an outer sheath. The filling body is used for carrying out filling protection on the outer sides of the multiple protection layers, circular holes distributed in an annular array mode are formed in the front face of the inner sheath, the inner walls of the circular holes are fixedly connected with liquid cooling pipes in a sleeving mode, and elastic supporting blocks distributed in an annular array mode are fixedly connected to the outer surface of the inner sheath; the outer surface of the inner sheath is fixedly sleeved with filling blocks distributed in an annular array, through the arrangement of the high-elastic buffer sheath, the elastic supporting blocks and the supporting rings, pressure caused by the external environment to the cable is buffered and absorbed, the cable structure is prevented from being damaged, and the service life of the cable is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a fireproof power cable with a long service life. Background Art

[0002] Power cables are used to transmit and distribute electrical energy, and are widely used in multiple scenarios such as urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. Underground laying of power cables is a common cable laying method, which has the advantages of small floor area, strong anti-interference ability, high reliability, and high safety. In a complex environment, the cable may encounter various pressures, such as vehicle rolling, soil pressure, building weight, etc.

[0003] At present, the structure of power cables is relatively simple. When subjected to external pressures such as vehicle rolling, soil pressure, building weight, etc., since there is no pressure reduction and dispersion structure inside the cable, the external pressure may cause damage to the cable, resulting in a short service life of the cable. Content of the Utility Model

[0004] Aiming at the defects in the prior art, the utility model provides a fireproof power cable with a long service life. By setting a high-elastic buffer sheath, elastic support blocks and support rings, the pressure caused by the external environment to the cable is buffered and absorbed, preventing the cable structure from being damaged and extending the service life of the cable.

[0005] A fireproof power cable with a long service life proposed by the utility model includes an inner sheath and a conductor. The inner sheath is internally provided with conductors distributed in an annular array. The outer surface of the conductor is fixedly sleeved with an insulating layer. The insulating layer is made of polyvinyl chloride. The outer surface of the insulating layer is fixedly sleeved with a protective layer. The protective layer is made of rubber. A filling body is arranged inside the inner sheath, and the filling body is used for filling and protecting the outer sides of multiple protective layers;

[0006] The front surface of the inner sheath is provided with circular holes distributed in an annular array, and the inner walls of the circular holes are fixedly sleeved with liquid cooling pipes.

[0007] Preferably, the outer surface of the inner sheath is fixedly connected with elastic support blocks distributed in an annular array, and the outer surface of the inner sheath is fixedly sleeved with filling blocks distributed in an annular array.

[0008] Preferably, the two side surfaces of the filling block are respectively in contact with one side surface of two adjacent elastic support blocks, and support rings are fixedly connected to the outer surfaces of multiple filling blocks.

[0009] Preferably, the outer surfaces of multiple filling blocks are all in contact with the inner wall of the support ring, and the outer surface of the support ring is fixedly sleeved with a high-elastic buffer sheath.

[0010] Preferably, a fireproof layer is fixedly sleeved on the outer surface of the high-elastic buffer sheath, and the material of the fireproof layer is a low-smoke and halogen-free flame retardant material.

[0011] Preferably, a steel tape armor is fixedly sleeved on the outer surface of the fireproof layer.

[0012] Preferably, an outer sheath is fixedly sleeved on the outer surface of the steel tape armor.

[0013] The beneficial effects of the present utility model are embodied in:

[0014] Through the settings of the high-elastic buffer sheath, the elastic support blocks and the support rings, the pressure caused by the external environment to the cable is buffered and absorbed, preventing the cable structure from being damaged and prolonging the service life of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0016] Figure 1 The front view of a fireproof power cable with a long service life provided by the present utility model;

[0017] Figure 2 For Figure 1 The three-dimensional view of the outer sheath structure of a fireproof power cable with a long service life shown;

[0018] Figure 3 For Figure 1 The three-dimensional view of the elastic support block structure of a fireproof power cable with a long service life shown;

[0019] Figure 4 For Figure 3 The enlarged view at A of a fireproof power cable with a long service life shown

[0020] Figure 5 For Figure 1 The three-dimensional view of the conductor structure of a fireproof power cable with a long service life shown.

[0021] In the drawings, 1, inner sheath; 2, conductor; 3, insulating layer; 4, protective layer; 5, filler; 6, round hole; 7, liquid cooling pipe; 8, elastic support block; 9, filling block; 10, support ring; 11, high-elastic buffer sheath; 12, fireproof layer; 13, outer sheath; 14, steel tape armor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The embodiments of the technical solution of the present utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present utility model, so they are only examples and cannot be used to limit the protection scope of the present utility model.

[0023] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meanings understood by those skilled in the art to which the present utility model belongs.

[0024] Refer to Figure 1-5 , a fireproof power cable with a long service life, including an inner sheath 1 and a conductor 2. The conductor 2 is arranged in an annular array inside the inner sheath 1. The inner sheath 1 prevents the cable from being affected by adverse factors such as mechanical damage, moisture intrusion, and chemical corrosion during laying and operation. An insulating layer 3 is fixedly sleeved on the outer surface of the conductor 2. The material of the insulating layer 3 is polyvinyl chloride (PVC). The insulating layer 3 protects the conductor inside the cable, prevents current leakage and external interference, thereby ensuring the normal operation and safe use of the cable. A protective layer 4 is fixedly sleeved on the outer surface of the insulating layer 3. The material of the protective layer 4 is rubber. The protective layer 4 protects the conductor 2. A filler 5 is arranged inside the inner sheath 1. The main function of the filler 5 is to fill the voids inside the cable, improve the overall structural stability of the cable, prevent the displacement of the cable core during use, and the filler 5 can also play roles such as flame retardancy and fire resistance, improving the safety performance of the cable. The filler 5 is used to fill and protect the outer sides of multiple protective layers 4;

[0025] Circular holes 6 are formed in the front surface of the inner sheath 1 in an annular array. A liquid cooling pipe 7 is fixedly sleeved on the inner wall of the circular hole 6. The liquid cooling pipe 7 is provided with a coolant. The selection of the coolant includes fluorinated liquid, hydrocarbon compounds, esters, and water / ethylene glycol mixture, etc.

[0026] Furthermore, elastic support blocks 8 are fixedly connected to the outer surface of the inner sheath 1 in an annular array. The arrangement of the elastic support blocks 8 enables the cable to be squeezed and contracted when subjected to external pressure, thereby buffering and absorbing the pressure transmitted from the outside to the inside of the cable and protecting the internal structure of the cable from damage. Filling blocks 9 are fixedly sleeved on the outer surface of the inner sheath 1 in an annular array. The filling blocks 9 fill the voids existing between the elastic support blocks 8, improving the overall structural stability of the cable.

[0027] Furthermore, the two side surfaces of the filling block 9 are respectively in contact with one side surface of two adjacent elastic support blocks 8. Support rings 10 are fixedly connected to the outer surfaces of multiple filling blocks 9. The support rings 10 can evenly disperse the pressure received onto multiple elastic support blocks 8 arranged in an annular array, so that the pressure received by each elastic support block 8 is small, preventing the elastic support blocks 8 from being damaged.

[0028] Furthermore, the outer surfaces of multiple filling blocks 9 are all in contact with the inner wall of the support ring 10. A highly elastic buffer sheath 11 is fixedly sleeved on the outer surface of the support ring 10. The main function of the highly elastic buffer sheath 11 is to protect the internal structure of the cable from physical damage and environmental factors, and it can resist mechanical pressure, abrasion, bending, twisting, etc. The materials include polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polyolefin (PO), fluoroplastics, nylon, etc.

[0029] Furthermore, a fireproof layer 12 is fixedly sleeved on the outer surface of the highly elastic buffer sheath 11. The material of the fireproof layer 12 is a low-smoke and halogen-free flame retardant material, which reduces the impact of fire on the cable and the surrounding environment. A shielding layer can be arranged outside the fireproof layer, and its materials mainly include metal materials and conductive polymer materials. The shielding layer can protect the flow of the internal current of the cable and reduce the influence of electromagnetic interference, ensuring the normal operation of the cable.

[0030] Furthermore, a steel tape armor 14 is fixedly sleeved on the outer surface of the fireproof layer 12. The steel tape armor 14 enables the cable to operate safely in a harsh environment, resist physical damage and chemical corrosion, and can withstand greater mechanical pressure. It is suitable for direct burial or laying in environments such as underground, tunnels, and pipelines.

[0031] Furthermore, an outer sheath 13 is fixedly sleeved on the outer surface of the steel tape armor 14, protecting the internal structure of the cable from external factors. The materials can be selected from inorganic materials such as mineral insulation materials such as magnesium oxide and ceramized silicone rubber, or organic materials such as flame-retardant polyvinyl chloride (FR PVC) and low-smoke and halogen-free materials (LSZH), etc., which have good flame-retardant performance and low smoke release.

[0032] Through the setting of the highly elastic buffer sheath, elastic support blocks and support ring, the pressure caused by the external environment to the cable is buffered and absorbed, preventing the cable structure from being damaged and extending the service life of the cable.

[0033] Working principle: When using a fireproof power cable with a long service life, an outer sheath 13 is provided on the outermost layer of this cable. The material can be selected from magnesium oxide, ceramized silicone rubber, low-smoke and halogen-free material LSZH, etc. It has good performance and can prevent mechanical damage, chemical corrosion, moisture intrusion, and biological invasion, etc., ensuring the safe operation of the cable and extending its service life. Inside the outer sheath 13, a steel tape armor 14 is provided. The steel tape armor 14 can be selected from galvanized steel tape or aluminum tape. The steel tape armor 14 enables the cable to operate safely in a harsh environment, resist physical damage and chemical corrosion, and can withstand greater mechanical pressure. The steel tape armor 14 is provided with a fireproof layer 12, the material of which is a low-smoke and halogen-free flame-retardant material, reducing the impact of fire on the cable and the surrounding environment. Inside the fireproof layer 12, a high-elastic buffer sheath 11 is provided. The material of it can be selected from polyethylene PE, polyvinyl chloride PVC, etc. The high-elastic buffer sheath 11 absorbs part of the pressure and reduces the damage of the pressure to the cable structure. Inside the high-elastic buffer sheath 11, a support ring 10, elastic support blocks 8 and filling blocks 9 are provided. The three cooperate with each other to absorb the remaining part of the pressure, prevent the cable structure from being damaged, and extend the service life of the cable. Inside, an inner sheath 1 is also provided to protect its conductor 2. Among them, a liquid cooling pipe 7 is provided on the inner wall of the inner sheath 1. There is a coolant in the liquid cooling pipe 7. The selection of the coolant includes fluorinated liquid, hydrocarbon compounds, esters, and water / ethylene glycol mixture, etc. The coolant absorbs and takes away the heat generated by the cable during the transmission of current, thereby maintaining the cable at a suitable working temperature, ensuring the safety of the cable and extending its service life. Finally, inside the inner sheath, a conductor 2, an insulating layer 3, a protective layer 4 and a filling body 5 are provided to protect the conductor inside the cable, prevent current leakage and external interference, thereby ensuring the normal operation and safe use of the cable and extending the service life of the cable.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A fireproof power cable with a long service life, comprising an inner sheath (1) and a conductor (2), characterized in that: Inside the inner sheath (1), conductors (2) are arranged in an annular array. An insulating layer (3) is fixedly sleeved on the outer surface of the conductor (2). The material of the insulating layer (3) is polyvinyl chloride (PVC). A protective layer (4) is fixedly sleeved on the outer surface of the insulating layer (3). The material of the protective layer (4) is rubber. A filling body (5) is arranged inside the inner sheath (1), and the filling body (5) is used for filling and protecting the outside of multiple protective layers (4); On the front surface of the inner sheath (1), circular holes (6) are arranged in an annular array. A liquid cooling pipe (7) is fixedly sleeved on the inner wall of the circular hole (6).

2. The long-service-life fireproof power cable according to claim 1, characterized in that: Elastic support blocks (8) are fixedly connected to the outer surface of the inner sheath (1) in an annular array. Filling blocks (9) are fixedly sleeved on the outer surface of the inner sheath (1) in an annular array.

3. The long service life fireproof power cable according to claim 2, characterized in that: Two side surfaces of the filling block (9) are respectively in contact with one side surface of two adjacent elastic support blocks (8). Support rings (10) are fixedly connected to the outer surfaces of multiple filling blocks (9).

4. A fireproof power cable with a long service life according to claim 3, characterized in that: The outer surfaces of multiple filling blocks (9) are all in contact with the inner wall of the support ring (10). A highly elastic buffer sheath (11) is fixedly sleeved on the outer surface of the support ring (10).

5. A fireproof power cable with a long service life according to claim 4, characterized in that: A fireproof layer (12) is fixedly sleeved on the outer surface of the highly elastic buffer sheath (11). The material of the fireproof layer (12) is a low-smoke and halogen-free flame retardant material.

6. The long service life fireproof power cable according to claim 5, characterized in that: A steel tape armor (14) is fixedly sleeved on the outer surface of the fireproof layer (12).

7. A fireproof power cable with a long service life according to claim 6, characterized in that: An outer sheath (13) is fixedly sleeved on the outer surface of the steel tape armor (14).

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