A highly elastic and extrusion-resistant composite cable

Abstract

The present invention discloses a high-elasticity, extrusion-resistant composite cable, which belongs to the technical field of cables. The high-elasticity central mechanism comprises a central elastic sleeve and an inner sleeve. The inner cavity of the inner sleeve is provided with a non-metallic reinforcement. The outer wall of the central elastic sleeve is provided with two injection-molded arc-shaped limiting sleeves. Three copper core conductors and three elastically separated solid tubes are provided in each arc-shaped limiting sleeve. An extruded composite pressure-resistant mechanism is provided outside the two arc-shaped limiting sleeves. Through the present invention, the extrusion resistance of the cable itself is improved from two positions, namely the central axis and the outer sheath of the cable, so that the copper core conductor in the cable can be quickly elastically reset after being squeezed, and the internal copper core conductor is not easily dislocated, which effectively avoids the situation where the copper core conductors are squeezed and damaged when subjected to external force.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of cables, in particular to a high-elasticity, extrusion-resistant composite cable. Background Art

[0002] Cables are usually made of several or several groups of wires (at least two in each group) twisted together, similar to ropes. Each group of wires is insulated from each other and often twisted around a center. The entire outside is covered with a highly insulating covering. The cable has the characteristics of internal power supply and external insulation. Cables include power cables, control cables, compensation cables, shielded cables, high-temperature cables, computer cables, signal cables, coaxial cables, fire-resistant cables, marine cables, mining cables, aluminum alloy cables, etc.

[0003] As people's requirements for cable compression resistance increase, anti-extrusion cables have been widely used and have played a significant role. In recent years, departments such as construction and transportation have required the use of higher pressure-resistant cables in subways, light rails, railways, large squares and other areas.

[0004] As for the currently existing cables, for example, the technical structure of the application document with application number 201720964708.8 includes a core body, and the outside of the core body is provided with a filling layer, a wrapping layer, a polyethylene structural layer, an insulation layer and a polyvinyl chloride structural layer from the inside to the outside. Support bars are provided between the core bodies, and the support bars are provided with a card slot corresponding to the core body, and the core body is clamped in the card slot. Although this structure improves the compressive buffering capacity of the cable by the support bar installed in the center of the cable, in areas such as subways, light rails, railways, and large squares, as the current building structures become more and more complex and diversified, this type of pressure-resistant cable can no longer meet the requirements. When subjected to strong external pressure, the compressive buffering capacity brought by the deformation of the support bar alone is weak, and the linear body in the cable is easily dislocated, causing mutual extrusion and damage. Summary of the Invention

[0005] The technical solution of the present invention addresses the technical problem that the existing technical solutions are too single, and provides a solution that is significantly different from the existing technology. Specifically, the present invention mainly provides a high-elasticity and extrusion-resistant composite cable to solve the technical problem raised in the above background technology that when subjected to strong external pressure, the internal conductors will become misaligned and cause mutual extrusion damage.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A highly elastic, extrusion-resistant composite cable comprises a central highly elastic mechanism, the central highly elastic mechanism comprising a central elastic sleeve and an inner sleeve located at the central axis of the central elastic sleeve, wherein the outer wall of the inner sleeve is surrounded by a plurality of injection-molded elastic supports at equal intervals, the inner cavity of the inner sleeve is provided with a non-metallic reinforcement, and the outer wall of the central elastic sleeve is provided with two injection-molded arc-shaped limiting sleeves, each of which is provided with three copper core conductors and three elastically separated solid tubes, and the copper core conductors and the elastically separated solid tubes in each arc-shaped limiting sleeve are arranged in an interlaced manner, and the two arc-shaped limiting sleeves are provided with an extruded composite pressure-resistant mechanism on the outside;

[0008] The composite pressure-resistant structure includes a polyester film layer, and the polyester film layer wraps two arc-shaped limiting sleeves. A wrapped fire-resistant mica tape is provided on the polyester film layer, and an extruded nitrile elastic pressure-resistant layer is provided on the fire-resistant mica tape. A steel belt armor is provided on the nitrile elastic pressure-resistant layer, and the outer wall of the steel belt armor is provided with an extruded halogen-free, low-smoke, flame-retardant protective sleeve.

[0009] Preferably, the polyester film layer and the fire-resistant mica tape have the same thickness, and the thickness of the polyester film layer and the fire-resistant mica tape is 1 cm-1.3 cm.

[0010] Preferably, the nitrile elastic pressure-resistant layer and the steel belt armor have the same thickness, and the thickness of the nitrile elastic pressure-resistant layer and the steel belt armor is 0.9 cm-1.2 cm.

[0011] Preferably, the thickness of the halogen-free low-smoke flame-retardant protective sleeve is equal to the sum of the thicknesses of the polyester film layer, the fire-resistant mica tape, the nitrile elastic pressure-resistant layer and the steel tape armor.

[0012] Preferably, an elastic filling rope is provided at the gap position in the inner cavity of each arc-shaped limiting sleeve.

[0013] Preferably, each of the copper core conductors is formed by twisting copper wire bundles.

[0014] Preferably, each of the copper core conductors is provided with a cross-linked polyethylene protective sheath, and each of the cross-linked polyethylene protective sheaths is provided with an extruded polyimide layer.

[0015] Preferably, an elastic reset strip is provided between every two adjacent elastic brackets.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention improves the anti-extrusion ability of the cable at the central axis position of the cable by arranging a central elastic sleeve, an inner sleeve, an elastic bracket, a non-metallic reinforcement and an elastic reset strip. The mutual cooperation between the nitrile elastic anti-pressure layer and the halogen-free low-smoke flame-retardant protective sleeve in the composite anti-pressure mechanism further improves the anti-extrusion ability of the cable itself from the position of the outer sheath of the cable. Under the limitation of the arc-shaped limiting sleeve, the elastic filling rope and the elastic separating solid tube, the copper core conductor in the cable can be quickly elastically reset after being squeezed, and the internal copper core conductor is not easy to be dislocated, which effectively avoids the direct contact and extrusion between the copper core conductors when subjected to external force, thereby causing damage.

[0018] (2) The present invention achieves conductor protection by providing a cross-linked polyethylene protective sheath and a polyimide layer outside the copper core conductor. The polyimide material is one of the organic polymer materials with the best comprehensive performance. It is resistant to high temperatures of more than 400°C and has a long-term operating temperature range of -200~300°C. Some of the materials have no obvious melting point and have high insulation performance. The dielectric constant is 4.0 at 10 Hz and the dielectric loss is only 0.004~0.007, which belongs to F to H grade insulation. The polyester film layer is mainly used for bundling to wrap the arc limit tube, and has a certain insulation effect, and also improves the heat resistance, making the cable structure compact and not loose, and heat-insulating during extrusion.

[0019] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 is a schematic diagram of a cross-section of a cable according to the present invention;

[0022] Figure 3 This is a schematic cross-sectional view of the central high elastic mechanism of the present invention;

[0023] Figure 4 It is a schematic cross-sectional view of the composite compression-resistant structure of the present invention.

[0024] Description of the drawings: 1. Central high-elastic mechanism; 11. Central elastic sleeve; 12. Inner sleeve; 121. Elastic bracket; 13. Non-metallic reinforcement; 14. Elastic reset strip; 15. Arc-shaped limit sleeve; 16. Copper core conductor; 161. Cross-linked polyethylene protective sleeve; 162. Polyimide layer; 17. Elastic separator solid tube; 18. Elastic filling rope; 2. Composite pressure-resistant mechanism; 21. Polyester film layer; 22. Fire-resistant mica tape; 23. Nitrile elastic pressure-resistant layer; 24. Steel belt armor; 25. Halogen-free and low-smoke flame-retardant protective sleeve. DETAILED DESCRIPTION

[0025] To facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the content disclosed in the present invention more thorough and comprehensive.

[0026] It should be noted that when an element is referred to as being "fixed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this article are for illustrative purposes only.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly used by those skilled in the art to which the present invention pertains. The terminology used in the specification of the present invention is for the purpose of describing specific embodiments and is not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0028] Example 1, please refer to the attached Figure 1-4 As shown, a high elasticity and anti-extrusion composite cable includes a central high elastic mechanism 1, the central high elastic mechanism 1 includes a central elastic sleeve 11 and an inner sleeve 12 located at the central axis of the central elastic sleeve 11, and the outer wall of the inner sleeve 12 is surrounded by a plurality of injection-molded elastic brackets 121 at equal intervals, the inner cavity of the inner sleeve 12 is provided with a non-metallic reinforcement 13, the outer wall of the central elastic sleeve 11 is provided with two injection-molded arc-shaped limiting sleeves 15, each of the arc-shaped limiting sleeves 15 is provided with three copper core conductors 16 and three elastically separated solid tubes 17, and each of the arc-shaped limiting sleeves 1 5, the copper core conductor 16 and the elastic separating solid tube 17 are arranged alternately with each other, and the two arc-shaped limiting sleeves 15 are jointly provided with an extruded composite pressure-resistant mechanism 2; the composite pressure-resistant mechanism 2 includes a polyester film layer 21, and the polyester film layer 21 wraps the two arc-shaped limiting sleeves 15, and a wrapped fire-resistant mica tape 22 is provided on the polyester film layer 21, and an extruded nitrile elastic pressure-resistant layer 23 is provided on the fire-resistant mica tape 22, and a steel belt armor 24 is provided on the nitrile elastic pressure-resistant layer 23, and the outer wall of the steel belt armor 24 is provided with an extruded halogen-free low-smoke flame-retardant protective sleeve 25.

[0029] The above structure improves the cable's own anti-extrusion ability from two positions, the central axis of the cable and the outer sheath, through the mutual cooperation between the central high-elasticity mechanism 1 and the composite anti-compression mechanism 2. This allows the copper core conductor 16 in the cable to quickly and elastically return to its original position after being squeezed, and the internal copper core conductor 16 is not easily dislocated, effectively avoiding the situation where the copper core conductors 16 are squeezed and damaged when subjected to external forces. In addition, the material cost is low, the extrusion molding process is simple, and the production is easy.

[0030] Example 2, please refer to the attached Figure 2 and 3 As shown, an elastic filling rope 18 is provided in the gap position of the inner cavity of each arc-shaped limiting sleeve 15. The elastic filling rope 18 is used to fill the gap position and prevent the copper core conductor 16 from shifting. Each copper core conductor 16 is twisted by a bundle of copper wires. A cross-linked polyethylene protective sleeve 161 is provided on the outside of each copper core conductor 16. An extruded polyimide layer 162 is provided on each cross-linked polyethylene protective sleeve 161. The polyimide layer 162 improves the stability, insulation and high temperature resistance of the copper core conductor 16. An elastic reset strip 14 is provided between each adjacent elastic bracket 121. The elastic reset strip 14 strengthens the elastic compressive strength of the cable center axis position.

[0031] Example 3, please refer to the attached Figure 1 and 3 As shown, the polyester film layer 21 and the fire-resistant mica tape 22 have the same thickness, and the thickness of the polyester film layer 21 and the fire-resistant mica tape 22 is 1cm-1.3cm. The fire-resistant mica tape 22 is a high-performance mica insulation product with excellent high temperature resistance and combustion resistance. The powder mica tape has good softness in normal state and is suitable for the main fire-resistant insulation layer in various cables. When encountering open flames, there is basically no volatilization of harmful smoke. The polyester film layer 21 is used to bundle the arc-shaped limit sleeve 15. The nitrile elastic The pressure-resistant layer 23 and the steel belt armor 24 have the same thickness, and the thickness of the nitrile elastic pressure-resistant layer 23 and the steel belt armor 24 is 0.9cm-1.2cm. The steel belt armor 24 is bolt-shaped and can be naturally bent. It has the advantages of high pressure resistance and strong tensile resistance. The thickness of the halogen-free low-smoke flame-retardant protective sleeve 25 is equal to the sum of the thickness of the polyester film layer 21, the fire-resistant mica tape 22, the nitrile elastic pressure-resistant layer 23 and the steel belt armor 24. Through the halogen-free low-smoke flame-retardant protective sleeve 25, it is achieved that when the cable is burning, no halogen-containing gas is released and the smoke concentration is low.

[0032] The above description of the present invention is exemplified in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as such non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A high elasticity, anti-extrusion composite cable, comprising a central high elasticity mechanism (1), characterized in that The central high elastic mechanism (1) includes a central elastic sleeve (11) and an inner sleeve (12) located at the central axis of the central elastic sleeve (11), and a plurality of injection-molded elastic brackets (121) are arranged around the outer wall of the inner sleeve (12) at equal intervals, and the inner cavity of the inner sleeve (12) is provided with a non-metallic reinforcement (13), and the outer wall of the central elastic sleeve (11) is provided with two injection-molded arc-shaped limiting sleeves (15), and each of the arc-shaped limiting sleeves (15) is provided with three copper core conductors (16) and three elastic separation solid tubes (17), and the copper core conductors (16) and the elastic separation solid tubes (17) in each of the arc-shaped limiting sleeves (15) are arranged in an interlaced manner, and the two arc-shaped limiting sleeves (15) are provided with an extruded composite pressure-resistant mechanism (2) on the outside; The composite pressure-resistant structure (2) includes a polyester film layer (21), and the polyester film layer (21) wraps two arc-shaped limiting sleeves (15), a fire-resistant mica tape (22) is provided on the polyester film layer (21), an extruded nitrile elastic pressure-resistant layer (23) is provided on the fire-resistant mica tape (22), and a steel belt armor (24) is provided on the nitrile elastic pressure-resistant layer (23), and the outer wall of the steel belt armor (24) is provided with an extruded halogen-free low-smoke flame-retardant protective sleeve (25); The thickness of the halogen-free low-smoke flame-retardant protective sleeve (25) is equal to the sum of the thicknesses of the polyester film layer (21), the fire-resistant mica tape (22), the nitrile elastic pressure-resistant layer (23), and the steel tape armor (24); The polyester film layer (21) and the fire-resistant mica tape (22) have the same thickness, and the thickness of the polyester film layer (21) and the fire-resistant mica tape (22) is 1 cm-1.3 cm; The nitrile elastic pressure-resistant layer (23) and the steel belt armor (24) have the same thickness, and the thickness of the nitrile elastic pressure-resistant layer (23) and the steel belt armor (24) is 0.9 cm-1.2 cm.

2. A highly elastic and extrusion-resistant composite cable according to claim 1, characterized in that: An elastic filling rope (18) is provided at the gap position of the inner cavity of each arc-shaped limiting sleeve (15).

3. The high elasticity and extrusion resistant composite cable according to claim 1, characterized in that: Each of the copper core conductors (16) is formed by twisting copper wire bundles.

4. A highly elastic and extrusion-resistant composite cable according to claim 3, characterized in that: A cross-linked polyethylene protective sleeve (161) is provided outside each of the copper core conductors (16), and an extruded polyimide layer (162) is provided on each of the cross-linked polyethylene protective sleeves (161).

5. The high elasticity and extrusion resistant composite cable according to claim 1, characterized in that: An elastic reset strip (14) is provided between every two adjacent elastic brackets (121).

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