Copper conductor, flame retardant, class A, PVC insulated, B2, wire

Abstract

The utility model relates to the technical field of electric wire and cable, and concretely relates to copper core flame -retardant A type polyvinyl chloride insulation B2 grade electric wire, including conductor and the insulating layer of conductor outside, still including first low friction coefficient interface layer and second low friction coefficient interface layer, wherein, first low friction coefficient interface layer is covered in the outer wall of conductor, and by conductor and first low friction coefficient interface layer constitute core unit, second low friction coefficient interface layer sets up in the inner layer of insulating layer, the utility model discloses the electric wire is set to by the core unit of conductor and first low friction coefficient interface layer and by second low friction coefficient interface layer and insulating layer constitute sheath unit, when the conductor of single electric wire fails, can be under the premise of not disturbing the same beam other electric wire completely, individually draws and changes the fault core unit, improves maintenance efficiency, reduces system maintenance risk and downtime.

Description

Technical Field

[0001] This utility model relates to the field of wire and cable technology, and more specifically to copper core flame-retardant Class A polyvinyl chloride insulated Class B2 wire. Background Technology

[0002] In modern data center server racks, communication core computer rooms, or large industrial control cabinets, in order to maximize space utilization and signal transmission efficiency, a large number of identical wires are tightly bundled together and laid in enclosed cable trays or conduits. These wires are typically B2 grade power cables consisting of a copper core and a copper core with an extruded polyvinyl chloride insulation layer.

[0003] When multiple wires are tightly bundled together, the outer PVC insulation layer undergoes slight plastic deformation under continuous pressure and room temperature creep, causing the insulation layers of adjacent cables to interlock or even slightly stick together. Under long-term overload, thermal cycling, and other environments, the wires may recrystallize and increase lattice defects, resulting in a slow increase in overall resistivity. When such problems occur, it is necessary to repair, replace, or add a line. However, maintenance personnel cannot pull out individual wires; usually, the entire bundle must be pulled out for replacement, leading to high maintenance and upgrade costs. Utility Model Content

[0004] In view of the technical problems existing in the polyvinyl chloride wires in the prior art, the first aspect of this utility model proposes a copper core flame-retardant Class A polyvinyl chloride insulated Class B2 wire, including a conductor and an insulation layer located outside the conductor, and also including a first low friction coefficient interface layer and a second low friction coefficient interface layer.

[0005] Wherein, the first low-friction coefficient interface layer covers the outer wall of the conductor, and the conductor and the first low-friction coefficient interface layer constitute a core unit; the second low-friction coefficient interface layer is disposed in the inner layer of the insulating layer, and the second low-friction coefficient interface layer and the insulating layer constitute a sheath unit.

[0006] The core unit and the sheath unit are configured to slide relative to each other under a certain axial pressure.

[0007] Preferably, the first low-friction coefficient interface layer is a solid lubricating layer that can be peeled off from the surface of the conductor.

[0008] Preferably, both the first low-friction coefficient interface layer and the second low-friction coefficient interface layer comprise a polytetrafluoroethylene (PTFE) structural layer.

[0009] Preferably, the frictional force between the conductor and the first low-friction coefficient interface layer is greater than the frictional force between the first low-friction coefficient interface layer and the second low-friction coefficient interface layer.

[0010] Preferably, the conductor includes a core layer and an outer layer, the core layer being a circular copper wire of a first diameter, and the outer layer including a plurality of circular copper wires of a second diameter loosely wound around the core layer, wherein the first diameter is larger than the second diameter.

[0011] Preferably, the second diameter is 10-20% of the first diameter.

[0012] Preferably, the cross-section of the second low-friction coefficient interface layer and the insulating layer is configured with a plurality of periodic protrusions and depressions.

[0013] Preferably, the outer wall of the second low-friction coefficient interface layer is provided with a spirally wound first rib, and the inner wall of the insulating layer is also provided with a corresponding second rib. The interlocking of the first rib and the second rib forms a periodic protrusion and depression structure of the interface.

[0014] Preferably, the insulation layer comprises a flame-retardant Class A polyvinyl chloride insulation layer.

[0015] Preferably, the core unit is configured to have conductor cross-sectional dimensions with different specifications for the same outer diameter.

[0016] Compared with the prior art, the advantages of this utility model are:

[0017] This invention sets the wire as a core unit consisting of a conductor and a first low-friction coefficient interface layer, and a sheath unit consisting of a second low-friction coefficient interface layer and an insulation layer. When the conductor of a single wire fails, the faulty core unit can be replaced separately without disturbing other wires in the same bundle, thereby improving maintenance efficiency and reducing system maintenance risks and downtime.

[0018] By combining the peelable interface layer with bare conductor threading, even if the conductor breaks completely deep within the wire harness, it can be replaced through a standardized process, solving the problem of not being able to replace individual conductors when the conductor breaks in the middle. In addition, with the outer diameter of the sheath unit unchanged, a conductor core unit with a larger cross-sectional area or higher performance can be replaced, realizing flexible upgrades to the line's current carrying capacity or transmission capacity. Attached Figure Description

[0019] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of the structure of the copper core flame-retardant Class A polyvinyl chloride insulated Class B2 wire shown in this utility model;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of the copper core flame-retardant Class A polyvinyl chloride insulated Class B2 wire shown in this utility model.

[0022] Figure 3 This is a schematic diagram of one of the wire core units in the wire harness shown in this utility model being pulled out of the sheath unit;

[0023] Figure 4 This is a schematic diagram of the core unit and sheath unit of the present invention in the axial cross section of the cable;

[0024] Figure 5 This is a schematic diagram showing the sheath unit at one end of the wire as shown in this utility model after it has been removed.

[0025] Figure 6 This is a schematic diagram of the core unit exposed after one end of the clamping wire has been removed, as shown in this utility model.

[0026] Figure 7 This is a schematic diagram of the clamping core unit shown in this utility model being pulled outwards;

[0027] Figure 8 This is a schematic diagram of the conductor-insertion sheath unit shown in this utility model;

[0028] Figure 9 This is a schematic diagram of the new core unit inserted into the sheath unit as shown in this utility model. Detailed Implementation

[0029] To better understand the technical content of this utility model, specific embodiments are provided below in conjunction with the accompanying drawings.

[0030] Combination Figure 1 and Figure 2 As shown, this utility model proposes a copper core flame-retardant Class A polyvinyl chloride insulated Class B2 wire, including a conductor 1 and an insulation layer 4 located outside the conductor 1, and also includes a first low friction coefficient interface layer 2 and a second low friction coefficient interface layer 3.

[0031] Combination Figure 3 As shown, the first low-friction coefficient interface layer 2 covers the outer wall of the conductor 1, and the conductor 1 and the first low-friction coefficient interface layer 2 constitute the core unit 10. The second low-friction coefficient interface layer 3 is disposed in the inner layer of the insulating layer 4, and the second low-friction coefficient interface layer 3 and the insulating layer 4 constitute the sheath unit 20.

[0032] The core unit 10 and the sheath unit 20 are configured to slide relative to each other under a certain axial pressure.

[0033] It should be understood that when multiple wires are bundled together and placed in a wire harness tube, if one of the conductors 1 needs to be replaced, the core unit 10 can be directly pulled out while the original sheath unit 20 is retained.

[0034] In this way, the operation only targets the faulty line itself and will not affect or wear down adjacent healthy lines; the replacement operation is simplified to one pull and one send, which can be completed by a single person in a few minutes, minimizing the downtime of critical facilities such as computer rooms and production lines; and the insulation and flame-retardant layers can be retained and reused.

[0035] In an optional embodiment, the first low-friction coefficient interface layer 2 is a solid lubricating layer that can be peeled off from the surface of the conductor 1.

[0036] It should be understood that a solid lubricating layer needs to have low friction, suitable bonding strength, flame retardancy, and durability. Low friction is the key to ensuring smooth pulling, suitable bonding strength can be achieved by forming a mechanical interlock through the loose winding of fine copper wires, and flame retardancy and durability can ensure long-term stable operation.

[0037] Specifically, both the first low-friction coefficient interface layer 2 and the second low-friction coefficient interface layer 3 include a polytetrafluoroethylene structural layer.

[0038] Polytetrafluoroethylene (PTFE) itself has a low coefficient of friction, enabling low-resistance sliding between the core unit 10 and the sheath unit 20. PTFE is also flame-retardant, meeting the requirements for Class A flame retardancy, and has stable chemical properties, is resistant to high and low temperatures and is not prone to aging, ensuring stability throughout the entire lifespan of the wire. In addition, PTFE can be processed onto the surface of conductor 1 by spraying, sintering, or other methods to form a thin film.

[0039] Furthermore, the frictional force between conductor 1 and the first low-friction coefficient interface layer 2 is greater than the frictional force between the first low-friction coefficient interface layer 2 and the second low-friction coefficient interface layer 3.

[0040] This makes it easier to pull the core unit 10 out from inside the sheath unit 20.

[0041] In a specific embodiment, combined with Figure 2 As shown, conductor 1 includes a core layer 11 and an outer layer 12. The core layer 11 is a circular copper wire with a first diameter, and the outer layer 12 includes a plurality of circular copper wires with a second diameter that are loosely wound around the core layer 11. The first diameter is larger than the second diameter.

[0042] Preferably, the second diameter is 10-20% of the first diameter.

[0043] Thus, by using the thin copper wires loosely wound on the outer layer, the contact area between the first low coefficient of friction interface layer 2 and the thin copper wires can be increased when the first low coefficient of friction interface layer 2 is extruded, thereby increasing the bonding force between the conductor 1 and the first low coefficient of friction interface layer 2. Especially when pulling the core unit 10 and clamping the core unit 10, pressure is applied to the first low coefficient of friction interface layer 2 and the conductor 1 at the same time, which helps to ensure that the first low coefficient of friction interface layer 2 and the conductor 1 do not delaminate.

[0044] Furthermore, the cross-section of the second low-friction coefficient interface layer 3 and the insulating layer 4 is constructed as a structure with multiple periodic protrusions and depressions.

[0045] Thus, the contact area between the second low-friction coefficient interface layer 3 and the insulating layer 4 is increased, which increases the interfacial bonding force between the second low-friction coefficient interface layer 3 and the insulating layer 4, and prevents the second low-friction coefficient interface layer 3 and the insulating layer 4 from delaminating when the core unit 10 is extracted.

[0046] In a specific embodiment, the outer wall of the second low friction coefficient interface layer 3 is provided with a spirally wound first rib 31, and the inner wall of the insulating layer 4 is also provided with a corresponding second rib 41. The interlocking of the first rib 31 and the second rib 41 forms a periodic protrusion and depression structure of the bonding interface.

[0047] Specifically, during wire production, a second low-friction coefficient interface layer 3 with a spiral or axial first rib 31 is first extruded. After it cools and sets, polyvinyl chloride insulation material is then extruded onto its surface to form an insulation layer 4.

[0048] During the extrusion of the insulation layer, the molten polyvinyl chloride material fills the depressions between the ribs and wraps around the ribs. After cooling, it forms a second rib 41 structure that is mechanically interlocked with it, thereby firmly combining the two layers into a whole sheath unit.

[0049] In the above embodiments, the insulation layer 4 includes a flame-retardant Class A polyvinyl chloride insulation layer.

[0050] In the above embodiments, the core unit 10 is configured to have conductor 1 cross-sectional dimensions with different specifications under the same outer diameter.

[0051] Therefore, 2.5mm can be used in the initial deployment of the data center. 2 For conductor core unit 10, when the power density of a single cabinet increases in the future, there is no need to rewire; simply replace the original core unit with one of the same outer diameter but with a conductor of 4.0mm. 2 The new core unit enables in-situ upgrades of the line, greatly improving the flexibility, forward-looking nature, and return on investment of the infrastructure.

[0052] In a specific embodiment, combined with Figure 4As shown, when the conductor malfunctions and needs to be replaced, one end of the wire is stripped (the second low-friction coefficient interface layer 3 and the insulation layer 4 are stripped) to expose the core unit 10 (e.g., Figure 5 (as shown), then combine Figure 6 As shown, use a tool to clamp the exposed core unit 10 and pull it outwards, as... Figure 7 As shown, until the core unit 10 is completely removed; then take a new core unit 10, and simultaneously peel off the outer thin copper wire (outer layer 12) and the first low friction coefficient interface layer 2, exposing a length of thick-diameter copper wire. The copper wire extends into the inner wall of the sheath unit 20 until the steel wire extends out from the other end, as shown. Figures 8 to 9 As shown, by pulling the copper wire, the core unit 10 with the first low-friction coefficient interface layer 2 is re-entered into the inner wall of the sheath unit 20 until it extends into the pulled end. The above method can be used to maintain the conductor or upgrade the cross-sectional size.

[0053] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A copper-core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire, characterized in that, It includes a conductor (1) and an insulating layer (4) located outside the conductor (1), and also includes a first low friction coefficient interface layer (2) and a second low friction coefficient interface layer (3). The first low friction coefficient interface layer (2) covers the outer wall of the conductor (1), and the conductor (1) and the first low friction coefficient interface layer (2) constitute the core unit (10). The second low friction coefficient interface layer (3) is disposed in the inner layer of the insulating layer (4), and the second low friction coefficient interface layer (3) and the insulating layer (4) constitute the sheath unit (20). The core unit (10) and the sheath unit (20) are configured to slide relative to each other under axial pressure.

2. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, The first low-friction coefficient interface layer (2) is a solid lubricating layer that can be peeled off from the surface of the conductor (1).

3. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, Both the first low-friction coefficient interface layer (2) and the second low-friction coefficient interface layer (3) include a polytetrafluoroethylene structural layer.

4. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, The frictional force between the conductor (1) and the first low-friction coefficient interface layer (2) is greater than the frictional force between the first low-friction coefficient interface layer (2) and the second low-friction coefficient interface layer (3).

5. The copper-core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, The conductor (1) includes a core layer (11) and an outer layer (12). The core layer (11) is a circular copper wire with a first diameter, and the outer layer (12) includes a plurality of circular copper wires with a second diameter loosely wound around the core layer (11). The first diameter is larger than the second diameter.

6. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 5, characterized in that, The second diameter is 10 to 20% of the first diameter.

7. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, The interface section between the second low friction coefficient interface layer (3) and the insulating layer (4) is constructed as a structure with multiple periodic protrusions and depressions.

8. The copper core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 7, characterized in that, The outer wall of the second low friction coefficient interface layer (3) is provided with a spirally wound first rib (31), and the inner wall of the insulating layer (4) is also provided with a corresponding second rib (41). The interlocking of the first rib (31) and the second rib (41) forms a periodic protrusion and depression structure of the interface.

9. The copper-core flame-retardant Class A polyvinyl chloride insulated Class B2 grade wire according to claim 1, characterized in that, The insulation layer (4) includes a flame-retardant Class A polyvinyl chloride insulation layer.

10. The copper-core flame-retardant Class A polyvinyl chloride insulated Class B2 wire according to any one of claims 1-9, characterized in that, The core unit (10) is configured to have conductor (1) cross-sectional dimensions with different specifications under the same outer diameter.

Images