Twisted pair

Abstract

The utility model relates to the technical field of electric power, in particular to a twisted pair, which comprises a first wire body and a second wire body, the first wire body and the second wire body are mutually wound, and the structures of the first wire body and the second wire body are the same; the first wire body comprises a conductor layer, an insulating layer arranged on the outer side of the conductor layer and a protective layer arranged on the outer side of the insulating layer, and the insulating layer comprises an insulating fireproof layer and an insulating oxygen barrier layer arranged on the outer side of the insulating fireproof layer. The beneficial effects of the utility model are that the concave and convex surfaces of the insulating fireproof layer and the insulating oxygen barrier layer are tightly attached, so that the cable structure is more stable while the wire performance and the fireproof performance are ensured, and the conductor layer is uniformly coated by the insulating layer through the insulating fireproof layer and the insulating oxygen barrier layer, so that the service life of the cable is prolonged. And the situation that the fireproof performance is reduced due to package leakage is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric power, especially a twisted pair wire. BACKGROUND

[0002] The twisted pair wire is widely used outdoors in rural areas and is mainly used for lighting due to its convenience. It is most commonly used in banquets, and the environment is very complex. It often needs to be dragged and exposed to sunlight, which has great safety hazards. Moreover, it is in a densely populated area. Once the circuit catches fire due to insulation cracking, it is easy to cause a fire accident.

[0003] Chinese patent application publication No. CN210378585U, published on September 26, 2019, entitled "750V halogen-free low-smoke fire-resistant high-temperature-resistant fixed wiring twisted pair wire", discloses a 750V halogen-free low-smoke fire-resistant high-temperature-resistant fixed wiring twisted pair wire, which comprises a mica tape and an irradiation cross-linked polyolefin insulation layer successively extruded and wrapped outside seven groups of cylindrical twisted copper conductors; single-core cables are used in groups, and each two groups of single-core cables are arranged in parallel to form a double-twisted cable after being twisted and twisted. Chinese patent application publication No. CN215731020U, published on May 25, 2021, entitled "Ceramic low-smoke halogen-free high-flame-retardant fire-resistant wear-resistant twisted pair wire", discloses a 750V halogen-free low-smoke fire-resistant high-temperature-resistant fixed wiring twisted pair wire, characterized in that it comprises two twisted cores, the core comprises a conductor, an insulation layer and a nylon braided layer, the insulation layer is arranged outside the conductor, and the material of the insulation layer is ceramic low-smoke halogen-free polyolefin fire-resistant material. The nylon braided layer is arranged outside the insulation layer. However, in the prior art, the mica tape wrapping process is complex and can easily cause wrapping to be missed, resulting in a decrease in the fireproof performance of the cable. The outer protective layer adopts a braided method, which can easily have gaps, resulting in a decrease in the protection performance of the insulation layer, poor waterproof performance and poor anti-aging performance. SUMMARY

[0004] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above or the problems existing in the prior art, the utility model is proposed.

[0006] Therefore, the purpose of the utility model is to provide a twisted pair wire, which has faster production efficiency, more uniform coating and will not cause fireproof performance to decrease due to missed wrapping.

[0007] To solve the above technical problems, the utility model provides the following technical scheme: a twisted pair, characterized in that: including first line body and second line body, first line body and second line body are mutually around setting, and the first line body and second line body structure are same;

[0008] The first line body includes a conductor layer, an insulating layer disposed outside the conductor layer, and a protective layer disposed outside the insulating layer.

[0009] As a preferred scheme of the twisted pair of the utility model, the insulating layer includes an insulating fireproof layer and an insulating oxygen barrier layer disposed outside the insulating fireproof layer.

[0010] As a preferred scheme of the twisted pair of the utility model, the insulating fireproof layer and the insulating oxygen barrier layer have a concave-convex shape at one end edge section, the convex surface of the insulating fireproof layer is tightly attached to the concave surface of the insulating oxygen barrier layer, and the concave surface of the insulating fireproof layer is tightly attached to the convex surface of the insulating oxygen barrier layer.

[0011] As a preferred scheme of the twisted pair of the utility model, the insulating fireproof layer is made of a ceramicized polyolefin material, and the insulating oxygen barrier layer is made of an irradiation cross-linked polyolefin material.

[0012] As a preferred scheme of the twisted pair of the utility model, the thickness of the insulating fireproof layer is controlled to be 0.4-0.6 mm, and the thickness of the insulating oxygen barrier layer is controlled to be 0.4-0.6 mm.

[0013] As a preferred scheme of the twisted pair of the utility model, the conductor layer includes two or more copper filaments, and the two or more copper filaments are twistedly connected.

[0014] As a preferred scheme of the twisted pair of the utility model, the protective layer is made of a nylon material.

[0015] As a preferred scheme of the twisted pair of the utility model, the protective layer is attached to the outside of the insulating oxygen barrier layer.

[0016] As a preferred scheme of the twisted pair of the utility model, the thickness of the protective layer is controlled to be 0.1-0.15 mm.

[0017] As a preferred scheme of the twisted pair of the utility model, the first line body is two groups, the two groups of first line bodies are twistedly connected, and the twist pitch of the two groups of first line bodies is 25-35 times the wire diameter.

[0018] The utility model discloses the beneficial effect: the utility model discloses the concave-convex surface close fitting of insulating fireproof layer and insulating oxygen barrier layer can guarantee the electric wire performance, the fire resistance performance simultaneously, makes the cable structure more stable, through adopting insulating fireproof layer and insulating oxygen barrier layer, makes the uniformity of insulating layer to conductor layer covering, and the fireproof performance will not appear the condition of decline caused by leakage package. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced the drawing needed to be used in the embodiment description, obviously, the drawing in the following description is only some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings. Among them:

[0020] Figure 1 It is a whole structure schematic diagram of a twisted pair wire.

[0021] Figure 2 It is a cross section structure schematic diagram of a twisted pair wire.

[0022] Figure 3 It is a cross section schematic diagram of a twisted pair wire DETAILED DESCRIPTION

[0023] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the following will be the specific embodiment of the utility model detailed description with the drawing of the specification.

[0024] In the following description, a lot of specific details are set forth in order to fully understand the utility model, but the utility model can also be implemented by other ways different from the description, and the skilled person in the art can make similar generalization without violating the connotation of the utility model, therefore the utility model is not limited by the following disclosed specific embodiments.

[0025] Secondly, the "one embodiment" or "embodiment" referred to here means that the specific features, structures or characteristics can be included in at least one implementation of the utility model. In this specification, "in one embodiment" does not mean the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments.

[0026] Embodiment 1

[0027] Reference Figure 1For the first embodiment of the utility model, the embodiment provides a twisted pair line, which comprises a first wire body 100 and a second wire body N, the first wire body 100 and the second wire body N are wound with each other, and the first wire body 100 and the second wire body N are of the same structure.

[0028] The first wire body 100 comprises a conductor layer 101, an insulation layer 102 and a protective layer 103.

[0029] Preferably, the first wire body 100 comprises a conductor layer 101, an insulation layer 102 arranged outside the conductor layer 101 and a protective layer 103 arranged outside the insulation layer 102, the insulation layer 102 is fireproof and resistant to ultraviolet rays, the protective layer is made of nylon material, and the thickness of the protective layer is controlled to be 0.1-0.15mm.

[0030] Preferably, the first wire body 100 is two groups, the two groups of first wire bodies 100 are twistedly connected, and the twist pitch of the two groups of first wire bodies 100 is 25-35 times the wire diameter.

[0031] In summary, the utility model can ensure the performance and fire resistance of the electric wire, make the cable structure more stable, and make the insulation layer 102 uniformly cover the conductor layer 101 without causing the fire resistance to decrease due to the leakage of the insulation layer 102 by adopting the concave-convex surface close fit of the insulation fireproof layer 102a and the insulation oxygen isolation layer 102b. Controlling the thickness of the protective layer 103 to be 0.1-0.15mm can achieve the effect of fireproof insulation of the first wire body 100 in actual application and is not easy to produce waste.

[0032] Embodiment 2

[0033] Reference Figures 1 to 3 For the second embodiment of the utility model, the difference between the embodiment and the first embodiment is that the insulation layer 102 comprises an insulation fireproof layer 102a and an insulation oxygen isolation layer 102b arranged outside the insulation fireproof layer 102a.

[0034] Further, one end of the insulation fireproof layer 102a and the insulation oxygen isolation layer 102b is in the form of a concave-convex shape, the convex surface of the insulation fireproof layer 102a is attached to the concave surface of the insulation oxygen isolation layer 102b, and the concave surface of the insulation fireproof layer 102a is attached to the convex surface of the insulation oxygen isolation layer 102b.

[0035] The one end of the insulation fireproof layer 102a and the insulation oxygen isolation layer 102b can be in the form of a concave-convex shape such as a wave shape.

[0036] Further, the insulation fireproof layer 102a is made of ceramicized polyolefin material, and the insulation oxygen isolation layer 102b is made of irradiation crosslinked polyolefin material.

[0037] The thickness of the insulating fireproof layer 102a is controlled at 0.4-0.6 mm, and the thickness of the insulating oxygen barrier layer 102b is controlled at 0.4-0.6 mm.

[0038] Furthermore, the conductor layer 101 includes two or more copper monofilaments, and the two or more copper monofilaments are twisted together.

[0039] The protective layer 103 is attached to the outside of the insulating and oxygen-barrier layer 102b.

[0040] Preferably, the insulating and fireproof layer 102a forms a ceramic hard shell structure at a temperature above 600°C, ensuring that the circuit is uninterrupted.

[0041] Preferably, the protective layer 103 is made of nylon 6 material.

[0042] Preferably, in use, the insulating fireproof layer 102a and the insulating oxygen barrier layer 102b are formed into an insulating layer 102 by high-temperature extrusion. The insulating fireproof layer 102a and the insulating oxygen barrier layer 102b are sequentially extruded over the conductor layer 101 to form a double-layer co-extruded insulating layer 102. A nylon material with a thickness of 0.1-0.15mm is then extruded over the double-layer co-extruded insulating layer 102 to form a protective layer 103.

[0043] Furthermore, the extrusion temperature of the double-layer co-extrusion process is 170-190℃, and the extrusion speed is 10-15m / min; the extrusion temperature of the nylon material extrusion process is 230-250℃, and the extrusion speed is 15-20m / min.

[0044] Furthermore, co-extrusion is an advanced materials processing technology that involves simultaneously extruding two different plastic or composite materials using two extruders, and then bonding these two layers together tightly through a special die. This process not only achieves the bonding between different materials but also leverages the advantages of each material to improve the performance of the final product.

[0045] Furthermore, extrusion refers to the process of melting materials using an extruder, mixing them evenly with a screw, and then uniformly coating the material onto the surface of the next layer using an extruder head.

[0046] In summary, this invention, through the tight bonding of the concave and convex surfaces of the insulating fireproof layer 102a and the insulating oxygen barrier layer 102b, can ensure the performance and fire resistance of the wire while making the cable structure more stable. By using the insulating fireproof layer 102a and the insulating oxygen barrier layer 102b, the insulation layer 102 uniformly covers the conductor layer 101 without any gaps that would reduce the fire resistance. By controlling the thickness of the protective layer 103 to 0.1-0.15mm, the first wire 100 achieves fireproof and insulating effects in practical applications without generating much waste.

[0047] Example 3

[0048] Reference Figures 1 to 3 This is the third embodiment of the present invention, which provides a twisted pair cable. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0049] To verify the performance of a twisted-pair cable in high-temperature environments, we conducted a systematic experiment. The purpose of the experiment was to test the electrical and mechanical properties of the twisted-pair cable under different temperature and aging conditions, in order to evaluate its fire resistance and anti-aging capabilities.

[0050] First, we selected three sets of test samples: Sample A (using a traditional PVC insulation layer and a common nylon protective layer), Sample B (using a common polyolefin insulation layer and a common nylon protective layer), and Sample C (the ceramicized polyolefin insulating fireproof layer and the irradiated cross-linked polyolefin insulating oxygen barrier layer of this invention, covered with a nylon 6 protective layer). For each of these three sets of samples, six 1-meter-long twisted-pair cables were prepared to ensure the reliability of the data.

[0051] During the experiment, we conducted the following tests on the three groups of samples:

[0052] High-temperature aging test: The sample was placed in a high-temperature environment of 150℃ for 7 days to simulate the effect of long-term high temperature on the material. The resistance change of the sample was recorded every 24 hours to evaluate the stability of its conductivity.

[0053] Fire resistance performance test: Each group of samples underwent a combustion test according to the UL94 V-0 standard. The combustion test was conducted in an environment of 450℃, and it was observed whether a ceramic hard shell structure was formed during the combustion process. The combustion time and remaining length were recorded.

[0054] Tensile strength test: Tensile strength tests were performed on the samples before and after aging, and the changes in tensile strength of the insulation layer, protective layer and twisted pair were recorded to evaluate the mechanical properties of the materials before and after aging.

[0055]

[0056] Combustion performance test: The afterflame time after the first flame application and the afterflame time after the second flame application were measured to evaluate the stability of the sample at high temperature.

[0057] Test subject name First application of flame - flame retardant rating Second application of flame - flame retardant rating Sample A V-1 HB Sample B V-1 V-2 Sample C V-0 V-0

[0058] The data in the table clearly shows that the twisted pair cable of this invention (sample C) demonstrates significantly better performance than the prior art (samples A and B) in various performance tests.

[0059] The effect of high-temperature aging on resistance changes:

[0060] The resistance of sample A changed by 2.5% before aging, and increased significantly to 12.8% after aging, indicating that the high temperature environment has a significant impact on the conductivity of sample A.

[0061] The resistance of sample B changed by 1.8% before aging and increased to 8.5% after aging, showing better stability than sample A.

[0062] The resistance change of sample C was only 0.5% before aging, and increased to 1.2% after aging, showing excellent resistance stability even under high temperature aging conditions.

[0063] Changes in the tensile strength of the insulation layer:

[0064] The tensile strength of the insulation layer of sample A decreased from 14.2 MPa before aging to 11.2 MPa after aging, indicating that aging has a significant impact on its mechanical properties.

[0065] The tensile strength of the insulation layer of sample B decreased from 13.5 MPa to 10.5 MPa, and aging also had a significant impact on it.

[0066] The tensile strength of the insulation layer of sample C decreased slightly from 10.5 MPa to 9.5 MPa, with aging having the least impact on it.

[0067] Changes in the tensile strength of the protective layer:

[0068] The tensile strength of the protective layer in sample A decreased from 39 MPa to 33 MPa, indicating that aging affects the mechanical properties of the protective layer.

[0069] The tensile strength of the protective layer of sample B decreased from 40 MPa to 32 MPa, and aging also had a significant impact on it.

[0070] The tensile strength of the protective layer of sample C decreased from 48 MPa to 44 MPa. Aging had a relatively small impact on it, and it maintained a high tensile strength.

[0071] Combustion performance test:

[0072] Sample A achieved flame retardant ratings of V-1 and HB after the first and second application of flame, respectively, failing to reach the highest fire resistance rating.

[0073] Sample B achieved a flame retardancy rating of V-1 after the first application of flame and V-2 after the second, demonstrating better fire resistance than Sample A, but still below the highest standard.

[0074] Sample C achieved the highest V-0 flame retardant rating after both the first and second flame applications, demonstrating excellent fire resistance.

[0075] Based on the above data analysis, the twisted pair cable of this invention exhibits excellent performance in terms of resistance stability, tensile strength retention, and fire resistance. These performance improvements, especially the performance of the ceramicized polyolefin material at high temperatures, overcome the problems of decreased resistance stability, tensile strength retention, and fire resistance caused by high temperatures in existing technologies, demonstrating the superiority of this invention in practical applications.

[0076] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0077] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0078] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A twisted pair cable, characterized in that: It includes a first wire body (100) and a second wire body (N), the first wire body (100) and the second wire body (N) are wound around each other, and the first wire body (100) and the second wire body (N) have the same structure; The first line body (100) includes a conductor layer (101), an insulating layer (102) disposed outside the conductor layer (101), and a protective layer (103) disposed outside the insulating layer (102).

2. The twisted pair cable as described in claim 1, characterized in that: The insulating layer (102) includes an insulating fireproof layer (102a) and an insulating oxygen barrier layer (102b) disposed outside the insulating fireproof layer (102a).

3. The twisted pair cable as described in claim 2, characterized in that: The insulating fireproof layer (102a) and the insulating oxygen barrier layer (102b) have concave and convex cross-sections at one end. The convex surface of the insulating fireproof layer (102a) is in contact with the concave surface of the insulating oxygen barrier layer (102b), and the concave surface of the insulating fireproof layer (102a) is in close contact with the convex surface of the insulating oxygen barrier layer (102b).

4. The twisted pair cable as described in claim 3, characterized in that: The insulating and fireproof layer (102a) is made of ceramicized polyolefin material, and the insulating and oxygen-barrier layer (102b) is made of irradiated cross-linked polyolefin material.

5. The twisted pair cable as described in claim 4, characterized in that: The thickness of the insulating fireproof layer (102a) is controlled to be 0.4-0.6 mm, and the thickness of the insulating oxygen barrier layer (102b) is controlled to be 0.4-0.6 mm.

6. The twisted pair cable as described in claim 5, characterized in that: The conductor layer (101) includes two or more copper monofilaments, and the two or more copper monofilaments are twisted together.

7. The twisted pair cable as described in claim 6, characterized in that: The protective layer (103) is made of nylon material.

8. The twisted pair cable as described in claim 7, characterized in that: The protective layer (103) is attached to the outside of the insulating and oxygen-barrier layer (102b).

9. The twisted pair cable as described in claim 8, characterized in that: The thickness of the protective layer (103) is controlled to be 0.1-0.15 mm.

10. The twisted pair cable as described in any one of claims 1 to 9, characterized in that: The first wire body (100) consists of two sets of first wire bodies (100) twisted together, and the twist pitch of the two sets of first wire bodies (100) is 25-35 times the wire diameter.

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