Fire-resistant compact instrument cable

Abstract

The utility model belongs to the technical field of cable manufacturing, and discloses a fire-resistant compact instrument cable, which sequentially comprises a middle wire group, a first belting layer, a peripheral wire group, a second belting layer, a total shielding layer and a sheath layer from inside to outside, the middle wire group comprises three mutually twisted first wire cores, each first wire core comprises a first fire-resistant belting, and each first fire-resistant belting comprises a second fire-resistant belting. The first wrapping tape layer is wound on the periphery of the middle wire set, the peripheral wire set comprises a plurality of second wire cores which are twisted and surround the first wrapping tape layer, the second wire cores and the first wire cores are consistent in structure, each second wire core is internally provided with a second fireproof wrapping tape, the second wrapping tape layer is wound on the periphery of the peripheral wire set, the total shielding layer wraps the periphery of the second wrapping tape layer, and the total shielding layer wraps the periphery of the second wrapping tape layer. The sheath layer is sleeved on the periphery of the total shielding layer. According to the fire-resistant compact instrument cable, good fire resistance is provided among the single wires, the overall use safety is high, the structure among different wires is compact, each wire can be uniformly stressed, and the service life is long.

Description

Technical Field

[0001] The utility model relates to the technical field of cable manufacturing, in particular to a fire-resistant compact instrument cable. Background Art

[0002] Cables are a general term for items such as optical cables and electrical cables. Cables are mainly used to connect different devices so that they can communicate with each other. Instrument cables are suitable for signal transmission in instruments and other electrical equipment, so that instruments can be connected to other devices. However, the different wires in existing instrument cables are not fire-resistant. If a wire inside the instrument cable spontaneously ignites, it will burn the surrounding wires, and the safety performance is poor. At the same time, the wires inside the existing instrument cables are relatively loose. During the use of instrument cables, it is easy for a single wire to be overstressed and broken, and the service life is relatively short.

[0003] Therefore, there is an urgent need for a fire-resistant compact instrument cable to solve the above technical problems. Utility Model Content

[0004] The utility model aims to provide a fire-resistant compact instrument cable, which has good fire resistance between single conductors and high overall safety in use. At the same time, the structure between different conductors is compact, each conductor can be evenly stressed, and has a long service life.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] A fire-resistant compact instrument cable comprising:

[0007] An intermediate wire group, the intermediate wire group comprising three first wire cores twisted together, each of the first wire cores comprising a first fire-resistant tape;

[0008] A first wrapping layer, wound around the outer periphery of the intermediate wire group;

[0009] The peripheral wire group includes a plurality of second wire cores, wherein the plurality of second wire cores are twisted around the first tape layer, and the second wire core structure is consistent with the first wire core structure;

[0010] A second tape layer is wound around the outer periphery of the peripheral wire group;

[0011] A total shielding layer, covering the outer periphery of the second wrapping layer;

[0012] The sheath layer is sleeved on the outer periphery of the overall shielding layer.

[0013] As a preferred technical solution for the fire-resistant compact instrument cable, the first wire core includes, from inside to outside, two mutually twisted wires, a non-woven fabric layer, a first shielding layer and a first polyester tape layer.

[0014] As a preferred technical solution for the fire-resistant compact instrument cable, the wire comprises, from inside to outside, a conductor, a first fire-resistant tape and a first insulating layer.

[0015] As a preferred technical solution for the fire-resistant compact instrument cable, the conductor is formed by twisting a plurality of tinned copper wires.

[0016] As a preferred technical solution for fire-resistant compact instrument cables, the first insulating layer includes a cross-linked polyethylene insulating layer and a low-smoke halogen-free flame-retardant polyolefin insulating layer arranged in sequence from inside to outside, and the first insulating layer is integrally formed by co-extrusion.

[0017] As a preferred technical solution for the fire-resistant compact instrument cable, the twist pitch of the two conductors is not greater than 100 mm.

[0018] As a preferred technical solution for the fire-resistant compact instrument cable, the first shielding layer is formed by braiding hot-dip tinned copper wires, and the braiding density of the first shielding layer is not less than 80%.

[0019] As a preferred technical solution of the fire-resistant compact instrument cable, the fire-resistant compact instrument cable further includes a filler, which is filled in the gaps between the middle wire group, the first tape layer, the outer wire group and the second tape layer.

[0020] As a preferred technical solution for the fire-resistant compact instrument cable, the cable pitch diameter ratio of the intermediate wire group and the peripheral wire group is no more than 16.

[0021] As an optimal technical solution for fire-resistant compact instrument cables, the sheath layer includes an inner sheath, a flame retardant tape and an outer sheath from the inside to the outside, and both the inner sheath and the outer sheath are made of low-smoke halogen-free flame retardant thermosetting material.

[0022] The beneficial effects of the utility model are:

[0023] The fire-resistant compact instrument cable provided by the utility model is provided with a first fire-resistant tape in each first core of the middle wire group, and the second core has the same structure as the first core, so a second fire-resistant tape is provided in each second core of the outer wire group, so that the middle wire group and the outer wire group both have fire-resistant performance, even if any first core or second core burns, it will not affect the surrounding first core or second core, so that the fire-resistant compact instrument cable as a whole has good fire-resistant performance and high safety in use; three first cores twisted with each other are used to form the middle wire group, and the three first cores are in an inverted triangle, which can ensure the stability of the center of the fire-resistant compact instrument cable, the setting of the first tape makes the middle wire group more compact, and it is also more convenient to twist the outer wire group, ensuring the stability of the twisting of the middle wire group and the outer wire group, the setting of the second tape makes the outer wire group and the middle wire group more compact, so that the overall structure of the fire-resistant compact instrument cable is stable and more compact, avoiding the situation where a single first core or a single second core is subjected to excessive force, and improving the service life of the fire-resistant compact instrument cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the fire-resistant compact instrument cable provided by the utility model;

[0025] Figure 2 This is a schematic diagram of the first wire core structure of the fire-resistant compact instrument cable provided by the utility model.

[0026] In the figure:

[0027] 11. first wire core; 111. wire; 1111. conductor; 1112. first fire-resistant tape; 1113. first insulating layer;

[0028] 112, non-woven fabric layer; 113, first shielding layer; 114, first polyester tape layer;

[0029] 2. The first tape layer;

[0030] 31. Second core;

[0031] 4. Second tape layer; 5. Overall shielding layer; 6. Sheath layer; 61. Inner protective layer; 62. Flame retardant tape; 63. Outer protective layer. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0033] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0036] like Figure 1 and Figure 2As shown in , this embodiment provides a fire-resistant compact instrument cable, which includes, from the inside to the outside, a middle wire group, a first tape layer 2, an outer wire group, a second tape layer 4, a total shielding layer 5 and a sheath layer 6. The middle wire group includes three first wire cores 11 twisted together. The three first wire cores 11 after twisting are in an inverted triangle shape, which can improve the overall stability of the middle wire group. Each first wire core 11 contains a first fire-resistant tape 1112. The first tape layer 2 is wrapped around the periphery of the middle wire group to prevent the middle wire group from scattering, thereby ensuring the compactness of the fire-resistant compact instrument cable. The outer wire group includes a plurality of second wire cores 31, which are twisted and arranged around the first tape layer 2. Since the three first wire cores 11 in the middle wire group are inverted triangles, the outer wire group is twisted on the basis of the middle wire group being wrapped around the first tape layer 2, which is not only convenient for twisting the outer wire group, but also ensures the stability of the outer wire group and the middle wire group after twisting. The outer wire group and the middle wire group are not easy to loosen, thereby improving the overall stability of the compact fire-resistant instrument cable. The second tape layer 4 is wrapped around the outer periphery of the outer wire group, which can further prevent the outer wire group from loosening, and at the same time can make the outer wire group and the middle wire group more compact, so as to improve the overall compactness of the fire-resistant compact instrument cable and make the conductive performance more stable. The total shielding layer 5 is coated on the outer periphery of the second tape layer 4 to improve the anti-interference ability of the fire-resistant compact instrument cable, and the sheath layer 6 is sleeved on the outer periphery of the total shielding layer 5 to ensure the wear resistance and extrusion resistance of the fire-resistant compact instrument cable.

[0037] The fire-resistant compact instrument cable provided in the present embodiment provides a first fire-resistant tape 1112 in each first core 11 of the middle wire group, makes the second core 31 consistent with the structure of the first core 11, and provides a second fire-resistant tape in each second core 31 of the outer wire group, so that both the middle wire group and the outer wire group have fire-resistant properties. Even if any first core 11 or second core 31 burns, it will not affect the surrounding first cores 11 or second cores 31, thereby making the fire-resistant compact instrument cable have good fire-resistant properties as a whole. Three first wire cores 11 twisted together are used to form an intermediate wire group. The three first wire cores 11 are inverted triangles, which can ensure the stability of the center of the fire-resistant compact instrument cable. The setting of the first wrapping layer 2 makes the intermediate wire group more compact and is also more convenient for twisting the outer wire group, ensuring the stability of the twisting of the intermediate wire group and the outer wire group, avoiding the situation where a single first wire core 11 or a single second wire core 31 is subjected to excessive force. The setting of the second wrapping layer 4 makes the outer wire group and the intermediate wire group more compact, thereby ensuring that the overall structure of the fire-resistant compact instrument cable is stable and more compact.

[0038] Exemplarily, the first core 11 includes two mutually twisted wires 111, a non-woven fabric layer 112, a first shielding layer 113 and a first polyester tape layer 114 from the inside to the outside, which can effectively reduce the electromagnetic interference between the three first cores 11 after twisting, and ensure the stability of the electrical signal transmission of the middle wire group. The non-woven fabric layer 112 is used to make the two mutually twisted wires 111 more compact, thereby ensuring the roundness of the first core 11. The first shielding layer 113 is used to further improve the anti-electromagnetic interference capability of the first core 11. Since polyester material has good mechanical properties, insulation, high temperature resistance and low temperature resistance, the first polyester tape layer 114 is set to ensure that the first core 11 has insulation, and at the same time can further ensure the service life of the first core 11, thereby ensuring the service life of the fire-resistant compact instrument cable as a whole.

[0039] Furthermore, the wire 111 includes a conductor 1111, a first fire-resistant tape 1112 and a first insulating layer 1113 from the inside to the outside. Since each wire 111 in the first core 11 includes the first fire-resistant tape 1112, the fire resistance of the first core 11 can be further improved, thereby improving the overall fire resistance of the fire-resistant compact instrument cable. In this embodiment, the conductor 1111 is formed by twisting a plurality of tinned copper wires, which can improve the flexibility of the conductor 1111 and further improve the flexibility of the fire-resistant compact instrument cable. The diameter of the tinned copper wire can be 0.175mm-0.2mm. In this embodiment, the first insulating layer 1113 includes a cross-linked polyethylene hydrocarbon insulation layer and a low-smoke halogen-free flame-retardant polyolefin insulation layer arranged in sequence from the inside to the outside. The low-smoke halogen-free flame-retardant polyolefin insulation layer includes a flame retardant and a polymer material, so that during the combustion process, the flame retardant can promote the dehydration and carbonization of other materials, thereby forming a carbon layer in the low-smoke halogen-free flame-retardant polyolefin insulation layer. The carbon layer can block the flame from burning the internal structure of the low-smoke halogen-free flame-retardant polyolefin insulation layer, and can also prevent the first insulating layer 1113 from dripping flames when burning, so that the first insulating layer 1113 meets the use requirements while also having flame retardancy, further improving the use safety of the conductor 111, and thereby improving the use safety of the fire-resistant compact instrument cable.

[0040] Furthermore, the twisting pitch of the two conductors 111 is not greater than 100 mm, which can ensure the compactness of the two conductors 111 twisted together, further ensure the compactness of the conductor 1111, and thus improve the compactness of the fire-resistant compact instrument cable. The first shielding layer 113 is formed by braiding hot-dip tinned copper wire, which can improve the flexibility of the first shielding layer 113, thereby improving the flexibility of the first core 11, and further improving the flexibility of the fire-resistant compact instrument cable.

[0041] In this embodiment, the fire-resistant compact instrument cable also includes a filler, which is filled in the gaps between the middle wire group, the first tape layer 2, the outer wire group, and the second tape layer 4, so that the inside of the fire-resistant compact instrument cable is more compact, the whole is more round and not easy to loosen, and has higher compression resistance. The filler can be made of elastic yarn or other materials, which are not specifically limited here.

[0042] In this embodiment, the ratio of the cabled pitch diameters of the middle wire group and the outer wire group is no more than 16, which can ensure the compactness of the twisting of the middle wire group and the outer wire group, thereby reducing the outer diameter of the fire-resistant compact instrument cable, making it more compact as a whole.

[0043] In this embodiment, the sheath layer 6 includes an inner sheath layer 61, a flame retardant tape 62 and an outer sheath layer 63 from the inside to the outside, which can improve the overall mechanical properties of the sheath layer 6, thereby improving the compressive strength of the fire-resistant compact instrument cable. The inner sheath layer 61 and the outer sheath layer 63 are both made of low-smoke halogen-free flame-retardant thermosetting materials to ensure that the sheath layer 6 has the ability to self-extinguish when burning, and will not release a large amount of dense smoke when burning, further improving the safety performance of the fire-resistant compact instrument cable.

[0044] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. A fire-resistant compact instrument cable, characterized in that: include: An intermediate wire group, the intermediate wire group comprising three first wire cores (11) twisted together, each of the first wire cores (11) comprising a first fire-resistant tape (1112); A first wrapping layer (2) is wound around the outer periphery of the intermediate wire group; An outer wire group, comprising a plurality of second wire cores (31), wherein the plurality of second wire cores (31) are twisted around the first wrapping layer (2), and the structure of the second wire cores (31) is consistent with that of the first wire cores (11); A second tape layer (4) is wound around the outer periphery of the peripheral wire group; A total shielding layer (5) covering the outer periphery of the second wrapping layer (4); The sheath layer (6) is sleeved on the outer periphery of the overall shielding layer (5).

2. The fire-resistant compact instrument cable according to claim 1, characterized in that: The first wire core (11) comprises, from the inside to the outside, two mutually twisted wires (111), a non-woven fabric layer (112), a first shielding layer (113) and a first polyester tape layer (114).

3. The fire-resistant compact instrument cable according to claim 2, characterized in that: The wire (111) comprises, from the inside to the outside, a conductor (1111), a first fire-resistant wrapping tape (1112) and a first insulating layer (1113).

4. The fire-resistant compact instrument cable according to claim 3, characterized in that: The conductor (1111) is formed by twisting a plurality of tinned copper wires.

5. The fire-resistant compact instrument cable according to claim 3, characterized in that: The first insulating layer (1113) comprises a cross-linked polyethylene insulating layer and a low-smoke halogen-free flame-retardant polyolefin insulating layer which are arranged in sequence from the inside to the outside. The first insulating layer (1113) is integrally formed by co-extrusion.

6. The fire-resistant compact instrument cable according to claim 2, characterized in that: The twist pitch of the two conductors (111) is no greater than 100 mm.

7. The fire-resistant compact instrument cable according to claim 2, characterized in that: The first shielding layer (113) is formed by braiding hot-dip tinned copper wires, and the braiding density of the first shielding layer (113) is not less than 80%.

8. The fire-resistant compact instrument cable according to any one of claims 1 to 7, characterized in that: The fire-resistant compact instrument cable further comprises a filler, which is filled in the gaps between the middle wire group, the first tape layer (2), the outer wire group and the second tape layer (4).

9. The fire-resistant compact instrument cable according to any one of claims 1 to 7, characterized in that: The cabled pitch diameter ratio of the intermediate wire group and the outer wire group is not greater than 16.

10. The fire-resistant compact instrument cable according to any one of claims 1 to 7, characterized in that: The sheath layer (6) comprises, from the inside to the outside, an inner protective layer (61), a flame retardant wrapping tape (62) and an outer protective layer (63), wherein both the inner protective layer (61) and the outer protective layer (63) are made of low-smoke halogen-free flame retardant thermosetting material.

Images