Flame-retardant shielding twisted-pair flat cable

Abstract

The utility model discloses a flame-retardant shielding twisted-pair flat cable, which belongs to the technical field of cables and comprises a U-shaped separation framework, separation sheets are arranged on the U-shaped separation framework and divide the U-shaped separation framework into more than two accommodating grooves, the more than two accommodating grooves are linearly arranged, twisted-pair cores are accommodated in the accommodating grooves, and the twisted-pair cores are arranged in the U-shaped separation framework. A first shielding layer is arranged outside the U-shaped separation framework, a flame-retardant layer is arranged outside the first shielding layer, and a sheath layer is arranged outside the flame-retardant layer. According to the utility model, crosstalk coupling between line pairs is effectively reduced; anti-slip raised lines are arranged on the separation sheets, so that the sliding of the twisted-pair wire cores in the cable is reduced, and the stability of the twisted-pair wire cores is improved; the flame-retardant layer adopts the mica tape and has excellent high-temperature resistance and combustion resistance, so that the operation time of the cable at high temperature is prolonged, and the normal work of a circuit is ensured; and the rectangular flat cable is not easy to rotate, so that the transmission quality and the stability of signals can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cables, and in particular relates to a flame-retardant shielded twisted-pair flat cable. Background Art

[0002] Twisted-pair cable is the most commonly used transmission medium in structured cabling projects. It consists of two insulated copper conductors twisted together at a specific density. Twisted-pair cables typically contain four pairs of twisted wires, housed within a circular sheath. To minimize slippage and ensure even distribution of the four pairs, a cross-shaped braid is typically placed in the center of the sheath. However, this circular cable is prone to rotation during installation, affecting signal transmission stability. Some twisted-pair cables also lack flame retardancy, resulting in short-term durability in high-temperature environments such as fires, failing to meet requirements. Utility Model Content

[0003] Technical problem: In view of the above problems existing in the prior art, the technical problem to be solved by the present invention is to provide a flame-retardant shielded twisted-pair flat cable to improve the overall stability of the cable during laying.

[0004] Technical solution: In order to solve the above technical problems, the technical solution adopted by this utility model is as follows:

[0005] A flame-retardant shielded twisted-pair flat cable comprises a U-shaped partition frame extending along the length of the cable, wherein the U-shaped partition frame is provided with one or more partition plates, and the partition plates divide the interior of the U-shaped partition frame into two or more accommodating slots, and the two or more accommodating slots are arranged in a straight line, and the accommodating slots accommodate twisted-pair cores, a first shielding layer is provided outside the U-shaped partition frame, a flame-retardant layer is provided outside the first shielding layer, and a sheath layer is provided outside the flame-retardant layer.

[0006] Furthermore, there are three separators, which are equidistantly arranged on the U-shaped separator frame, and the separators are integrally formed with the U-shaped separator frame.

[0007] Furthermore, the highest point of the partition sheet is flush with the highest point of the U-shaped partition frame.

[0008] Furthermore, a plurality of anti-slip ridges are provided on both side surfaces of the separator, and the anti-slip ridges extend along the length direction of the cable.

[0009] Furthermore, the twisted pair core includes two mutually twisted working wires, and the working wire includes a first conductor and a first insulating layer surrounding the first conductor.

[0010] Furthermore, the twisted pair core also includes a second insulation layer arranged outside the two working wires.

[0011] Furthermore, a second shielding layer wrapped around the two working wires is provided in the second insulating layer, and both the first shielding layer and the second shielding layer are made of aluminum foil.

[0012] Furthermore, a ground wire is provided between the first shielding layer and the flame retardant layer.

[0013] Furthermore, the flame retardant layer is a mica tape, and the sheath layer is a low-smoke halogen-free flame retardant sheath.

[0014] Furthermore, the cross-sections of the flame retardant layer and the sheath layer are both rectangular ring-shaped.

[0015] Beneficial effects: Compared with the prior art, the utility model has the following advantages:

[0016] 1. A U-shaped separation frame and separator are set to separate the twisted pair cores in the corresponding receiving slots and arrange them in a straight line, effectively reducing crosstalk coupling between wire pairs and improving the balance characteristics of the cable. Anti-slip convex strips are set on the separator to reduce the sliding of the twisted pair cores in the cable and improve the stability of the twisted pair cores, making the signal more stable and the transmission effect better.

[0017] 2. A flame retardant layer is set outside the first shielding layer. The flame retardant layer uses mica tape. On the one hand, it improves the insulation performance of the cable and increases the mechanical strength and wear resistance. On the other hand, the mica tape has excellent high temperature resistance and combustion resistance, which prolongs the operation time of the cable at high temperatures and ensures the normal operation of the circuit.

[0018] 3. The flat cable is rectangular as a whole, and the twisted pair cores are arranged in a line inside the flat cable, which makes it easier to lay close to the installation surface. The rectangular flat cable is not easy to rotate, which is beneficial to improving the transmission quality and stability of the signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the cross-sectional structure of the flat cable in Example 1 of the present utility model;

[0020] Figure 2 is a schematic diagram of the cross-sectional structure of the U-shaped partition frame of Example 1;

[0021] Figure 3 1 is a schematic diagram of the cross-sectional structure of the twisted pair core of Example 1;

[0022] Figure 4 2 is a schematic diagram of the cross-sectional structure of the twisted pair core of Example 2; DETAILED DESCRIPTION

[0023] The present invention will be further illustrated below with reference to specific examples. The examples are implemented based on the technical solutions of the present invention. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0024] like Figure 1 and Figure 2 As shown, a flame-retardant shielded twisted-pair flat cable includes a U-shaped separator frame 1, a separator 2, a twisted-pair core 3, a first shielding layer 4, a flame-retardant layer 5, a sheath layer 6 and a ground wire 7. The cross-section of the flat cable is rectangular, which makes it easier to lay the flat cable close to the installation surface. The rectangular flat cable is not easy to rotate, which is beneficial to improving the stability of signal transmission. The U-shaped partition skeleton 1 is made of polyethylene polymer material. The U-shaped partition skeleton 1 extends along the length direction of the cable. The cross-section of the U-shaped partition skeleton 1 is U-shaped. Three partitions 2 are provided on the U-shaped partition skeleton 1. The partitions 2 are integrally formed with the U-shaped partition skeleton 1 during manufacturing. The partitions 2 extend along the length direction of the U-shaped partition skeleton 1. The three partitions 2 are equidistantly arranged on the U-shaped partition skeleton 1, thereby dividing the U-shaped partition skeleton 1 into four receiving slots. The four receiving slots are arranged in a straight line, and the twisted pair cores 3 are accommodated in the receiving slots. The presence of the U-shaped partition skeleton 1 can increase the overall strength and stability of the cable, prevent the cable from being damaged or broken, and ensure a reasonable construction bending radius to prevent excessive bending from damaging the cable, thereby ensuring the stability and security of data transmission.

[0025] like Figure 1 and Figure 3 As shown, four twisted pair cores 3 are provided. The twisted pair cores include two mutually twisted working wires and a second insulating layer 34 surrounding the two working wires. The working wires include a first conductor 31 and a first insulating layer 32 surrounding the first conductor 31. The first conductor 31 has a circular cross-section, and the first insulating layer 32 and the second insulating layer 34 both have an annular cross-section. The first conductor 31 is made of pure copper wire, and the first insulating layer 32 and the second insulating layer 34 are both made of polyethylene. The twisted pair design effectively reduces electromagnetic interference and radio frequency interference, ensuring the stability and efficiency of data transmission. In this embodiment, the conductor diameter is 0.57-0.58 mm, and the average thickness of the first insulating layer 32 is 0.22 mm. It complies with ISO / IEC11801 and ANSI / TIA / EIA-568B, with an operating frequency of up to 250 MHz, a transmission rate exceeding 600 Mbps, a time delay (ns / 100 m) ≤ 45, and a 20% conductor DC resistance (ohms / km) ≤ 74.8.

[0026] like Figure 1 and Figure 2As shown, the two side cross-sections of the U-shaped partition frame 1 are rectangular, the cross-section of the partition plate 2 is also rectangular, the highest point of the partition plate 2 is flush with the highest point of the U-shaped partition frame 1, and the three partition plates 2 are arranged at equal distances, so that the four accommodating grooves in the U-shaped partition frame 1 are equal rectangular accommodating grooves, and each twisted pair core 3 is arranged in a accommodating groove. A plurality of anti-slip ridges 101 are provided on both side surfaces of the partition plate 2, and a plurality of anti-slip ridges 101 are also provided on the inner sides of the two side edges of the U-shaped partition frame 1. The anti-slip ridges 101 extend along the length direction of the cable, and the cross-section of the anti-slip ridges 101 is semicircular. When the twisted pair core 3 is located in the accommodating groove, the U-shaped partition frame 1 and the partition plate 2 are set to separate the four twisted pair cores 3, maintaining the relative positions of the four twisted pair cores 3. The separated structure can effectively reduce the crosstalk coupling between the wire pairs and improve the balance characteristics of the cable; the two sides of the twisted pair core 3 are in contact with the anti-slip ridges 101 in the corresponding accommodating groove. When the anti-slip ridges 101 are in contact with the twisted pair core 3, since the anti-slip ridges 101 are made of soft material, the contact with the twisted pair core 3 can prevent the second insulation layer 34 of the twisted pair core 3 from moving, reducing the sliding of the twisted pair core 3, further improving the balance characteristics of the cable and reducing signal crosstalk, making the signal more stable and the transmission effect better.

[0027] like Figure 1 As shown, the first shielding layer 4 is surrounded by the U-shaped partition frame 1 and the four twisted pair cores 3. The first shielding layer 4 uses aluminum foil to further reduce signal interference. A ground wire 7 is also provided outside the first shielding layer 4 to directly guide the interference current to the ground. External electromagnetic interference may generate a certain amount of charge. The ground wire 7 can release the charge to protect the internal twisted pair from external electromagnetic interference.

[0028] like Figure 1 As shown, the flame-retardant layer 5 is disposed outside the first shielding layer 4. Made of existing mica tape, this layer not only provides excellent insulation properties and mechanical strength and abrasion resistance, but also boasts excellent high-temperature and flame-resistance properties. When exposed to open flames, it emits virtually no harmful smoke, extending the cable's operating life at high temperatures and ensuring proper circuit operation. The sheath layer 6, disposed outside the flame-retardant layer 5, is a low-smoke, halogen-free flame-retardant sheath with excellent fire resistance, effectively reducing toxic gases produced in the event of a fire. Both the flame-retardant layer 5 and the sheath layer 6 have rectangular ring-shaped cross-sections.

[0029] Example 2

[0030] like Figure 4 As shown, the difference from Example 1 is that the twisted pair core 3 also includes a second shielding layer 33, which is wrapped around the two working lines and arranged in the second insulating layer 34. The second shielding layer 33 is also made of aluminum foil. The second shielding layer 33 and the first shielding layer 4 form an inner and outer double-layer shielding, which has a better shielding effect.

[0031] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A flame retardant shielded twisted pair flat cable, characterized in that: The invention comprises a U-shaped partition frame (1) extending along the length direction of the cable, wherein the U-shaped partition frame (1) is provided with one or more partition plates (2), and the partition plates (2) divide the interior of the U-shaped partition frame (1) into two or more receiving slots, wherein the two or more receiving slots are arranged in a straight line, wherein twisted pair cores (3) are received in the receiving slots, and a first shielding layer (4) is provided outside the U-shaped partition frame (1), a flame retardant layer (5) is provided outside the first shielding layer (4), and a sheath layer (6) is provided outside the flame retardant layer (5).

2. The flame-retardant shielded twisted-pair flat cable according to claim 1, characterized in that: Three separators (2) are provided, and the three separators (2) are arranged at equal distances on the U-shaped separator frame (1). The separators (2) and the U-shaped separator frame (1) are integrally formed.

3. The flame-retardant shielded twisted-pair flat cable according to claim 2, characterized in that: The highest point of the separation sheet (2) is flush with the highest point of the U-shaped separation frame (1).

4. The flame-retardant shielded twisted-pair flat cable according to claim 2, characterized in that: A plurality of anti-slip convex strips (101) are provided on both side surfaces of the separator (2), and the anti-slip convex strips (101) extend along the length direction of the cable.

5. The flame-retardant shielded twisted-pair flat cable according to claim 1, characterized in that: The twisted pair core (3) comprises two mutually twisted working wires, wherein the working wire comprises a first conductor (31) and a first insulating layer (32) surrounding the first conductor (31).

6. The flame-retardant shielded twisted-pair flat cable according to claim 5, characterized in that: The twisted pair core further comprises a second insulating layer (34) arranged outside the two working wires.

7. The flame-retardant shielded twisted-pair flat cable according to claim 6, characterized in that: A second shielding layer (33) wrapped around the two working wires is further provided in the second insulating layer (34), and both the first shielding layer (4) and the second shielding layer (33) are made of aluminum foil.

8. The flame-retardant shielded twisted-pair flat cable according to claim 1, characterized in that: A ground wire (7) is provided between the first shielding layer (4) and the flame retardant layer (5).

9. The flame-retardant shielded twisted-pair flat cable according to claim 1, characterized in that: The flame retardant layer (5) is a mica tape, and the sheath layer (6) is a low-smoke, halogen-free flame retardant sheath.

10. The flame-retardant shielded twisted-pair flat cable according to claim 1, characterized in that: The cross sections of the flame retardant layer (5) and the sheath layer (6) are both rectangular ring-shaped.

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