Cold-resistant flame-retardant power cable

Abstract

The utility model belongs to the technical field of power cables, and particularly relates to a cold-resistant flame-retardant power cable, which comprises an inner support and a plurality of cable cores circumferentially distributed on the outer side of the inner support, an inner coating layer is arranged outside the cable cores, a shielding layer is formed outside the inner coating layer, an arc-shaped groove is formed in the outer side of the inner support, and the arc-shaped groove is communicated with the inner support. Buffer strips capable of forming buffer space in the cable are arranged in the arc-shaped grooves, the cable core is attached to the inner sides of the buffer strips, and thermoplastic elastomers distributed circumferentially are further arranged on the outer sides of the inner support and the cable core. It can be understood that the polyphthalamide arranged outside the cable has a flame retardant effect, the thermoplastic elastomer arranged on the inner side can achieve the flame retardant effect, can resist low temperature and ensure the performance of the cable, and the arranged buffer strips can form a buffer space in the cable to ensure the bending degree of the cable. Meanwhile, the thermoplastic elastomer is of a spliced structure, so that the cable performance can be ensured while production is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of power cables, and particularly relates to a cold-resistant and flame-retardant power cable. Background Art

[0002] Power cables are used to transmit and distribute electrical energy, and are widely used in urban underground power grids, outgoing lines of power stations, and internal power supply of industrial and mining enterprises. Power cables can be divided into low-voltage, medium-voltage, high-voltage, extra-high-voltage, and ultra-high-voltage cables according to voltage levels. Its basic structure includes a conductor, an insulating layer, and a protective layer. The conductor is mostly made of copper or aluminum and is used to conduct current; the insulating layer is wrapped outside the conductor to play an insulating role;

[0003] At present, power cables do not have reliable cold resistance and flame retardancy. When the temperature is too low, the conductor resistance of the cable will increase, resulting in power loss and reduced transmission efficiency. At the same time, the insulating material may become brittle and easily break, affecting the normal operation of the cable and even causing short circuits or failures. In addition, the accumulation of snow and wind may also cause the wire and cable to sag, break, or disconnect, further affecting its performance;

[0004] When a fire occurs, the cable structure is easily damaged, affecting power transmission and distribution lines, urban underground power grids, outgoing lines of power stations, etc.;

[0005] To solve the above problems, a cold-resistant and flame-retardant power cable is proposed in this application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a cold-resistant and flame-retardant power cable, which solves the problems mentioned in the above background art.

[0007] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0008] The utility model is a cold-resistant and flame-retardant power cable, which includes an inner support and a plurality of cable cores circumferentially distributed outside the inner support. An inner cladding layer is arranged outside the cable cores, a shielding layer is formed outside the inner cladding layer, an arc-shaped groove is arranged on the outside of the inner support, and a buffer strip capable of forming a buffer space inside the cable is arranged in the arc-shaped groove. The cable cores are attached to the inner side of the buffer strip. A thermoplastic elastomer is also arranged circumferentially outside the inner support and the cable cores. An outer cladding layer is formed outside the thermoplastic elastomer, polyphthalamide is formed outside the outer cladding layer, and a wear-resistant layer is arranged outside the polyphthalamide.

[0009] Furthermore, inclined buffer ribs are arranged on the inner side of the buffer strip, the buffer ribs are arranged at equal intervals, the outer side of the shielding layer is attached to the inner side of the buffer ribs, and a buffer space is formed between adjacent two buffer ribs.

[0010] Further, the thermoplastic elastomer is circumferentially distributed and completely wraps the inner support and the cable core. On one side where two adjacent thermoplastic elastomers are connected, a card slot is provided, and on the other side, a card strip is provided. Most of the circumferentially distributed thermoplastic elastomers are connected through the card slot and the card strip.

[0011] Further, an arc-shaped groove for the cable core to be embedded is formed on the inner side of the thermoplastic elastomer, and two adjacent thermoplastic elastomers are closely attached to each other.

[0012] Further, the cable core is located in the middle of the inner side of the thermoplastic elastomer.

[0013] Further, after a number of circumferentially distributed thermoplastic elastomers are combined, a complete circular surface matching the outer coating layer is formed on the outer side.

[0014] Further, the buffer strip is semicircularly arranged.

[0015] The utility model has the following beneficial effects:

[0016] Through the arranged thermoplastic elastomer and polyphthalamide in the utility model, the polyphthalamide forms a flame-retardant first protective layer on the outside of the cable, while the thermoplastic elastomer forms a flame-retardant and low-temperature-resistant second protective layer on the inside of the cable. Through the double protection, the cold resistance and flame retardancy of the cable can be effectively improved, and thus it can be used more reliably in extreme environments;

[0017] The buffer strip arranged at the connection between the inner support and the cable core in the utility model can play a buffering role. At the same time, the gap between the buffer ribs can leave a bending space for the cable, ensuring the bending degree of the cable at low temperature. The spliced thermoplastic elastomer can not only form a relatively thick protective layer but also facilitate the production of the cable;

[0018] Of course, it is not necessary for any product implementing the utility model to achieve all the above-mentioned advantages simultaneously. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the cross-section of the utility model;

[0021] Figure 2 It is a schematic structural diagram of the top view of the utility model;

[0022] Figure 3 For Figure 1Schematic structural diagram of the thermoplastic elastomer;

[0023] Figure 4 is Figure 1 Schematic structural diagram of the buffer strip in;

[0024] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0025] In the figure: 1, inner support; 2, cable core; 3, inner coating layer; 4, shielding layer; 5, buffer strip; 51, buffer rib; 6, thermoplastic elastomer; 61, card slot; 62, card strip; 7, outer coating layer; 8, polyphthalamide; 9, wear-resistant layer. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "open hole", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0028] Please refer to Figures 1-4 As shown, the present invention is a cold-resistant and flame-retardant power cable, including an inner support 1 and a plurality of cable cores 2 circumferentially distributed outside the inner support 1. An inner coating layer 3 is arranged outside the cable core 2, a shielding layer 4 is formed outside the inner coating layer 3, an arc-shaped groove is opened on the outside of the inner support 1, and a buffer strip 5 capable of forming a buffer space inside the cable is arranged in the arc-shaped groove. The cable core 2 is attached to the inner side of the buffer strip 5. A circumferentially distributed thermoplastic elastomer 6 is also arranged outside the inner support 1 and the cable core 2. An outer coating layer 7 is formed outside the thermoplastic elastomer 6, a polyphthalamide 8 is formed outside the outer coating layer 7, and a wear-resistant layer 9 is arranged outside the polyphthalamide 8. The shielding layer 4 in this embodiment increases the shielding effect between adjacent cable cores 2 and reduces the mutual interference therebetween.

[0029] Among them, buffer ribs 51 are arranged inside the buffer strip 5 in an inclined manner, and the buffer ribs 51 are arranged at equal intervals. The outer side of the shielding layer 4 is attached to the inner side of the buffer ribs 51, and a buffer space is formed between two adjacent buffer ribs 51. In this embodiment, both the buffer strip 5 and the buffer ribs 51 are made of low-temperature-resistant rubber soft materials, forming a buffer space inside the cable core 2, thereby providing more bending deformation space for the cable core 2 and playing a protective role for the cable core 2.

[0030] Among them, the thermoplastic elastomer 6 is circumferentially distributed and completely wraps the inner support 1 and the cable core 2. A card slot 61 is arranged on one side where two adjacent thermoplastic elastomers 6 are connected, and a card strip 62 is arranged on the other side. Most of the circumferentially distributed thermoplastic elastomers 6 are connected through the card slot 61 and the card strip 62. In this embodiment, the matching structure of the card slot 61 and the card strip 62 is adopted. After multiple thermoplastic elastomers 6 are combined, they can be directly formed without using auxiliary devices to limit multiple thermoplastic elastomers 6 and then perform the coating work, and at the same time, the structural strength is also increased.

[0031] Among them, an arc-shaped groove for the cable core 2 to be embedded is also formed inside the thermoplastic elastomer 6, and two adjacent thermoplastic elastomers 6 are closely attached to each other. In this embodiment, the arc-shaped groove inside the thermoplastic elastomer 6 mainly fits with the cable core 2, forming a supporting and protective role for the cable core 2.

[0032] Among them, the cable core 2 is located in the middle of the inner side of the thermoplastic elastomer 6. In this embodiment, the cable core 2 is located in the middle of the inner side of the thermoplastic elastomer 6. At this time, the thermoplastic elastomer 6 can fully protect the cable core 2.

[0033] Among them, a complete circular surface matching with the outer coating layer 7 is formed on the outer side after several circumferentially distributed thermoplastic elastomers 6 are combined. In this embodiment, the circular shape on the outer side after the thermoplastic elastomers 6 are combined facilitates the formation of the outer coating layer 7, and at the same time, a closed protective layer can be formed outside the cable core 2.

[0034] Among them, the buffer strip 5 is semicircularly arranged. In this embodiment, the buffer strip 5 just fits into the arc-shaped groove on the outer side of the inner support 1, and at the same time, an arc-shaped structure for the cable core 2 to fit is formed inside, forming a buffer space between the inner support 1 and the cable core 2.

[0035] It can be understood that first, polyphthalamide located outside the cable is set to achieve a flame-retardant effect. By setting the inner thermoplastic elastomer, it can not only achieve a flame-retardant effect but also be low-temperature-resistant, ensuring the performance of the cable. Secondly, the buffer strip set can form a buffer space inside the cable, ensuring the bendability of the cable. At the same time, the thermoplastic elastomer is a splicing structure, which is convenient for production and can ensure the performance of the cable.

[0036] A specific application of this embodiment is as follows: An inner cladding layer 3 and a shielding layer 4 are formed outside the cable core 2. The inner bracket 1 is extrusion-molded and the buffer strip 5 is pressed into the external annular groove. The cable core 2 is pressed inside the buffer strip 5. The thermoplastic elastomer 6 is distributed circumferentially and butt-jointed. When butt-jointing, the card slot 61 and the card strip 62 are engaged. Then, an outer cladding layer 7 is formed outside the thermoplastic elastomer 6, a polyphthalamide 8 is formed outside the outer cladding layer 7, and finally, a wear-resistant layer 9 is formed outside the polyphthalamide 8.

[0037] In the description of this specification, the description with reference to terms such as "an embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0038] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A cold-resistant flame-retardant power cable, comprising an inner support (1) and a plurality of cable cores (2) circumferentially distributed outside the inner support (1), wherein an inner coating layer (3) is arranged outside the cable core (2), characterized in that: The inner coating layer (3) is externally molded with a shielding layer (4); the inner support (1) is externally provided with an arc-shaped groove, in which a buffer strip (5) is arranged to form a buffer space inside the cable; the cable core (2) is attached to the inner side of the buffer strip (5); the inner support (1) and the cable core (2) are externally provided with a circumferentially distributed thermoplastic elastomer (6); the thermoplastic elastomer (6) is externally molded with an outer coating layer (7); the outer coating layer (7) is externally molded with polyphthalamide (8); and the polyphthalamide (8) is externally provided with a wear-resistant layer (9).

2. A cold-resistant flame-retardant power cable according to claim 1, characterized in that: The inner side of the buffer strip (5) is provided with obliquely arranged buffer ribs (51), the buffer ribs (51) are arranged at equal intervals, the outer side of the shielding layer (4) is in contact with the inner side of the buffer ribs (51), and a buffer space is formed between two adjacent buffer ribs (51).

3. The cold-resistant flame-retardant power cable according to claim 1, characterized in that: The thermoplastic elastomer (6) is distributed circumferentially and completely wraps the inner support (1) and the cable core (2); a clamping groove (61) is provided on one side where two adjacent thermoplastic elastomers (6) are connected, and a clamping strip (62) is provided on the other side; and the majority of the circumferentially distributed thermoplastic elastomers (6) are connected via the clamping groove (61) and the clamping strip (62).

4. The cold-resistant flame-retardant power cable according to claim 1, characterized in that: An arc-shaped groove for embedding the cable core (2) is also formed on the inner side of the thermoplastic elastomer (6), and two adjacent thermoplastic elastomers (6) are tightly fitted.

5. The cold-resistant flame-retardant power cable according to claim 1, characterized in that: The cable core (2) is located in the middle of the inner side of the thermoplastic elastomer (6).

6. The cold-resistant flame-retardant power cable according to claim 1, characterized in that: A plurality of thermoplastic elastomers (6) distributed circumferentially are combined to form a complete circular surface on the outside that matches the outer covering layer (7).

7. The cold-resistant flame-retardant power cable according to claim 1, characterized in that: The buffer strip (5) is arranged in a semicircular shape.

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