Double-layer armored steel tape layer and cable

Abstract

The utility model provides a double-layer armored steel belt layer and a cable, belonging to the technical field of cable protection, comprising an outer layer steel belt and an inner layer steel belt, the outer layer steel belt and the inner layer steel belt are provided with a plurality of projections and recesses along respective width directions, and a first contact portion of the outer layer steel belt is contacted with a second contact portion of the inner layer steel belt. The convex and concave structures can effectively disperse stress and prevent overlarge local deformation, so that the bearing capacity and the stability of the whole armor layer are improved, and meanwhile, the mutually embedded contact structure remarkably increases the friction force and the mechanical occlusal force between the inner steel belt and the outer steel belt, so that the service life of the armor layer is prolonged. Therefore, the interlayer slippage phenomenon possibly generated under the action of bending, vibration or external force in the use process is effectively inhibited, and the reliability and the service life of the cable in a complex laying environment are improved.

Description

Technical Field

[0001] This utility model belongs to the field of cable protection technology, and relates to a double-layer armored steel tape layer and a cable. Background Technology

[0002] In the field of cable engineering, the mechanical protection and long-term stable operation capability of cables are key considerations in design and application. Double-layer armored steel tape, as an enhanced protective structure, is widely used in cable lines that need to withstand high mechanical stress and have potential external damage risks.

[0003] In summary, although some existing technical solutions have solved the problem of weak cable compressive strength, there is still considerable room for improvement because the existing double-layer armored steel tape layers are prone to slippage and misalignment, resulting in some parts of the cable not being protected by the steel tape. Summary of the Invention

[0004] The purpose of this utility model is to address the aforementioned problems existing in the prior art by proposing a double-layer armored steel strip layer, comprising:

[0005] The outer steel strip has a first contact portion, and the outer steel strip has a plurality of protrusions and recesses arranged sequentially along its width direction;

[0006] The inner steel strip has a second contact portion. The inner steel strip has a plurality of protrusions and recesses arranged sequentially along its width direction. When the outer steel strip partially overlaps with the inner steel strip, the first contact portion contacts the second contact portion.

[0007] In the aforementioned double-layer armored steel strip layer, the protrusions and concave cross sections of the outer steel strip and the inner steel strip are arc-shaped.

[0008] In the aforementioned double-layer armored steel strip layer, the cross-sections of the first contact portion and the second contact portion are arc-shaped, and the centers of the cross-sections of the first contact portion and the second contact portion are both located on the outer side of the double-layer armored steel strip layer.

[0009] In the aforementioned double-layer armored steel strip layer, the cross-sections of the first contact portion and the second contact portion are arc-shaped, and the centers of the cross-sections of the first contact portion and the second contact portion are both located inside the double-layer armored steel strip layer.

[0010] In the aforementioned double-layer armored steel strip layer, the cross-sectional shape of both the first contact portion and the second contact portion consists of two arc segments. The center of the arc segment at both ends of the outer steel strip is located inside the double-layer armored steel strip layer, and the center of the arc segment at both ends of the inner steel strip is located outside the double-layer armored steel strip layer.

[0011] The purpose of this utility model is to address the aforementioned problems existing in the prior art, and to propose a cable comprising: a conductor, insulation, an inner sheath, and an outer sheath;

[0012] The insulation wraps around the outside of the conductor, the inner sheath wraps around the outside of the insulation, the inner steel strip and the outer steel strip are wrapped around the outside of the inner sheath in sequence, and the outer sheath wraps around the outside of the inner steel strip and the outer steel strip.

[0013] The cable described above also includes a conductor shield, an insulation shield, and a metal shield. The conductor shield is disposed between the conductor and the insulation, the insulation shield is disposed on the outside of the insulation, and the metal shield is disposed on the outside of the insulation shield.

[0014] In one type of cable described above, the number of conductors is at least two, the number of conductors and the number of insulation are at least two, and the cable ties are also included, which are sleeved on the outside of all the conductors and the insulation.

[0015] In one of the aforementioned cable components, a filler is further included, which is disposed between the insulation and the cable tie.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. The raised and recessed structure can effectively disperse stress and prevent excessive local deformation, thereby improving the load-bearing capacity and stability of the entire armor layer. At the same time, this interlocking contact structure significantly increases the friction and mechanical interlocking force between the inner and outer steel strips, thereby effectively suppressing interlayer slippage that may occur during use due to bending, vibration or external force, and improving the reliability and service life of the cable in complex laying environments.

[0018] 2. The arc-shaped mating surface can effectively reduce the risk of frictional damage between the inner and outer steel strips when the cable is subjected to bending or dynamic external forces, and avoid local wear or crack initiation caused by sharp edges, thereby extending the service life of the armored cable.

[0019] 3. The edges of the steel strips are relatively sharp. This structure, by having the edge of the outer steel strip facing the inner steel strip and the edge of the inner steel strip facing the outer steel strip, not only ensures a tight fit between the outer steel strips, but also allows the edge of the outer steel strip to contact the outer sheath with a smooth arc transition, and the edge of the inner steel strip to contact the inner sheath with a smooth arc transition, thus providing good cushioning and protection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of Embodiment 1 of the present invention.

[0021] Figure 2 This is a schematic diagram of Embodiment 2 of the present invention.

[0022] Figure 3 This is a schematic diagram of Embodiment 3 of the present invention.

[0023] Figure 4 This is a schematic diagram of Embodiment 4 of the present invention.

[0024] Figure 5 This is a cross-sectional view of the cable of this utility model.

[0025] In the picture:

[0026] 1. Outer steel strip; 11. First contact part; 2. Inner steel strip; 21. Second contact part; 3. Conductor; 4. Insulation; 5. Inner sheath; 6. Outer sheath; 71. Conductor shield; 72. Insulation shield; 73. Metal shield; 8. Cable tie; 9. Filler. Detailed Implementation

[0027] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly and specifically defined.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "connection" and "fixation" should be interpreted broadly. For example, "fixation" can be a fixed connection, a detachable connection, or an integral part; 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 components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] The specific embodiments described herein are merely illustrative examples of this utility model patent. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the patent of this utility model or exceeding the scope defined by the appended claims.

[0033] like Figures 1-4 As shown, a double-layer armored steel strip layer includes: an outer steel strip and an inner steel strip 2.

[0034] The outer steel strip is provided with a first contact portion 11, and the outer steel strip is provided with a plurality of protrusions and depressions in sequence along its width direction.

[0035] The inner steel strip 2 is provided with a second contact portion 21. The inner steel strip 2 has a plurality of protrusions and depressions arranged sequentially along its width direction. When the outer steel strip partially overlaps with the inner steel strip 2, the first contact portion 11 contacts the second contact portion 21.

[0036] Specifically, the outer steel strip and the inner steel strip 2 are provided with a plurality of protrusions and depressions in the width direction. This design allows the protrusions and depressions to effectively disperse stress and prevent excessive local deformation when the outer steel strip and the inner steel strip 2 are superimposed and wrapped around the cable core and subjected to external pressure. At the same time, the protrusions and depressions allow the first contact part 11 and the second contact part 21 to contact in an interlocking manner.

[0037] In this embodiment, the protruding and recessed structure can effectively disperse stress and prevent excessive local deformation, thereby improving the load-bearing capacity and stability of the entire armor layer. At the same time, this interlocking contact structure significantly increases the friction and mechanical interlocking force between the inner and outer steel strips, thereby effectively suppressing interlayer slippage that may occur during use due to bending, vibration or external force, and improving the reliability and service life of the cable in complex laying environments.

[0038] like Figures 1-4 As shown, based on the above embodiment, the protrusions and concave cross sections of the outer steel strip and the inner steel strip 2 are arc-shaped.

[0039] Specifically, the arc-shaped structure not only has good load-bearing capacity in terms of mechanical properties, but is also easier to realize in the processing and forming process. The arc-shaped protrusions and concaves can achieve a tighter and more uniform fit. This fit not only enhances the contact area between the two steel strips, but also makes the pressure distribution between them more uniform.

[0040] In this embodiment, the arc-shaped mating surface can effectively reduce the risk of frictional damage between the inner and outer steel strips when the cable is subjected to bending or dynamic external force, and avoid local wear or crack initiation caused by sharp edges, thereby extending the service life of the armored cable. Example 1:

[0041] like Figures 1-4 As shown, based on the above embodiment, the cross-section of the first contact portion 11 and the second contact portion 21 is an arc shape, and the center of the cross-section of the first contact portion 11 and the second contact portion 21 is located on the outside of the double-layer armored steel strip layer.

[0042] Specifically, since the center of the arc of the cross-section of the first contact portion 11 and the second contact portion 21 is located outside the double-layer armored steel strip, the arcs at both ends of the outer steel strip and the inner steel strip 2 face upward, i.e. towards the outside of the cable, thereby preventing the double-layer armored steel strip from scratching the inner sheath 5 of the cable after wrapping the cable.

[0043] In this embodiment, the edge of the steel strip is relatively sharp, which can easily cause local stress concentration or even scratches on the inner sheath 5 material, thereby affecting the overall sealing performance and long-term operational stability of the cable. This structure sets the contact part as an arc shape with the outer side as the center, which not only achieves good fit and tight interlocking between the inner and outer steel strips, but more importantly, it allows the edge of the inner steel strip 2 to contact the inner sheath 5 in a smooth arc transition manner, which plays a good role in buffering and protection. Example 2:

[0044] like Figures 1-4 As shown, based on the above embodiment, the cross-section of the first contact portion 11 and the second contact portion 21 is an arc shape, and the center of the cross-section of the first contact portion 11 and the second contact portion 21 is located inside the double-layer armored steel strip layer.

[0045] Specifically, since the center of the arc of the cross-section of the first contact portion 11 and the second contact portion 21 is located inside the double-layer armored steel strip, the arcs at both ends of the outer steel strip and the inner steel strip 2 face downwards, i.e. towards the inside of the cable, thereby preventing the double-layer armored steel strip from scratching the outer sheath 6 of the cable after wrapping it around the cable.

[0046] In this embodiment, the edge of the steel strip is relatively sharp, which can easily cause local stress concentration or even scratches on the outer sheath 6 material, thereby affecting the overall sealing performance and long-term operational stability of the cable. This structure sets the contact part as an arc shape with the inner side as the center, which not only achieves good fit and tight interlocking between the inner and outer steel strips, but more importantly, it allows the edge of the outer steel strip to contact the outer sheath 6 in a smooth arc transition manner, which plays a good role in buffering and protection. Example 3:

[0047] like Figures 1-4 As shown, based on the above embodiment, the cross-sectional shape of the first contact portion 11 and the second contact portion 21 are both two arc segments, and the center of the arc of the cross-section at both ends of the outer steel strip is located inside the double-layer armored steel strip layer, while the center of the arc of the cross-section at both ends of the inner steel strip 2 is located outside the double-layer armored steel strip layer.

[0048] Specifically, the cross-sectional shape of the first contact portion 11 and the second contact portion 21 is an arc at both ends, with the arc at both ends of the outer steel strip facing downwards, i.e. towards the inner steel strip 2, and the arc of the inner steel strip 2 facing upwards, i.e. towards the outer steel strip, thereby preventing the double-layer armored steel strip from scratching the outer sheath 6 and the outer sheath 6 of the cable after wrapping the cable.

[0049] In this embodiment, the edges of the steel strips are relatively sharp. By having the edge of the outer steel strip facing the inner steel strip 2 and the edge of the inner steel strip 2 facing the outer steel strip, this structure not only ensures the tight interlocking between the outer steel strips, but also allows the edge of the outer steel strip to contact the outer sheath 6 in a smooth arc transition manner, and the edge of the inner steel strip 2 to contact the inner sheath 5 in a smooth arc transition manner, thus playing a good buffering and protection role. Example 4:

[0050] like Figures 1-4 As shown, based on the above embodiment, the cross-sections of the protrusions and depressions of the outer steel strip and the inner steel strip 2 are V-shaped.

[0051] In this embodiment, because the "V" shaped structure has obvious ridges and inclined sides, it can effectively disperse and transmit force when subjected to external pressure, thereby greatly improving the overall compressive strength and structural rigidity of the double-layer armored steel strip layer. Compared with arc-shaped or other complex contour structures, the "V" shaped protrusions and depressions are easier to achieve through forming processes such as rolling or stamping during the manufacturing process. Its processing parameters are easier to control, and the mold design is also relatively simple, which is conducive to improving production efficiency and reducing manufacturing costs.

[0052] Secondly, a cable is proposed, comprising: conductor 3, insulation 4, inner sheath 5, and outer sheath 6.

[0053] The insulation 4 wraps around the outside of the conductor 3, the inner sheath 5 wraps around the outside of the insulation 4, the inner steel strip 2 and the outer steel strip are wrapped around the outside of the inner sheath 5 in sequence, and the outer sheath 6 wraps around the outside of the inner steel strip 2 and the outer steel strip.

[0054] Specifically, the insulation layer 4 tightly wraps around the conductor 3, playing a crucial role in isolating the live conductor from the outside environment. This effectively prevents leakage, short circuits, and electric shock accidents, and is a core component ensuring the safe operation of the cable. To further enhance the cable's mechanical protection performance and structural stability, an inner sheath 5 structure is also provided between the inner steel strip 2 and the insulation layer 4. The inner sheath 5 not only has good flexibility and a certain mechanical strength, but also plays a dual role of buffering and isolation in the structural design. The inner sheath 5 and the outer sheath 6 work together to wrap and fix the double-layer armored steel strip layer, ensuring that it maintains a stable position in the entire cable structure and preventing the armor layer from loosening or shifting due to external forces or vibrations and bending during the laying process.

[0055] In this embodiment, the inner sheath 5 not only plays a crucial role in protecting the insulation layer 4 from mechanical damage, but also, through its synergistic effect with the outer sheath 6, effectively positions and fixes the double-layer armored steel tape layer, thereby improving the overall safety, reliability and service life of the cable. It is especially suitable for complex applications that require the cable to withstand large mechanical stress or frequent movement.

[0056] like Figures 1-5 As shown, based on the above embodiment, it also includes conductor 3 shielding, insulation 4 shielding and metal shielding 73. The conductor 3 shielding is disposed between the conductor 3 and the insulation 4, the insulation 4 shielding is disposed on the outside of the insulation 4, and the metal shielding 73 is disposed on the outside of the insulation 4 shielding.

[0057] In this embodiment, the synergistic cooperation of the three-layer shielding structure of conductor 3 shielding, insulation 4 shielding and metal shielding 73 not only effectively improves the electric field distribution inside the cable, enhances the insulation performance and anti-interference ability, but also enhances the cable's stable operation capability in complex electromagnetic environments. It is widely applicable to application scenarios with high electrical performance requirements, such as medium and high voltage power cables, rail transit cables and special industrial cables.

[0058] like Figures 1-5 As shown, based on the above embodiment, the number of conductors 3 and insulation 4 is at least two, and it also includes cable ties 8, which are sleeved on the outside of all conductors 3 and insulation 4.

[0059] Specifically, there are at least two conductors 3 and two layers of insulation 4, forming the basic structure of a multi-core cable. This design is suitable for three-phase power transmission, multi-channel signal transmission, or other applications that require multiple independent power channels. Multiple conductors 3 are arranged in parallel and each is wrapped with an independent layer of insulation 4 to ensure that each conductor 3 is electrically isolated from each other and to avoid short circuits or cross interference.

[0060] In this embodiment, in order to ensure the stability and compactness of multiple conductors 3 and insulation 4 in the overall cable structure, cable ties 8 are also used to wrap the cable structure. The cable ties 8 are sleeved on the outside of all conductors 3 and insulation 4 layers, tightly binding multiple conductor 3 units together to form an integral structure. The cable ties 8 not only play a role in fixing and positioning, but also effectively prevent relative displacement or loosening between conductors 3 during subsequent processing or laying.

[0061] like Figures 1-5 As shown, it also includes a filler 9, which is disposed between the insulation 4 and the cable tie 8.

[0062] In this embodiment, the filler 9 is disposed between the insulation 4 and the cable tie 8 to fill the gaps between multiple conductors 3, making the overall cable structure more compact and round, and greatly facilitating the wrapping of the inner sheath 5, outer sheath 6 and double-layer armored steel tape layer in subsequent processing.

Claims

1. A double layer of armoured steel strips characterised in that, include: The outer steel strip has a first contact portion, and the outer steel strip has a plurality of protrusions and recesses arranged sequentially along its width direction; The inner steel strip has a second contact portion. The inner steel strip has a plurality of protrusions and recesses arranged sequentially along its width direction. When the outer steel strip partially overlaps with the inner steel strip, the first contact portion contacts the second contact portion.

2. A double wall of steel strip armour layers as claimed in claim 1 characterised in that: The outer steel strip and the inner steel strip have convex and concave cross-sections that are arc-shaped.

3. A double wall of steel strip armour layers as claimed in claim 2 characterised in that: The cross-sections of the first contact portion and the second contact portion are arc-shaped, and the centers of the cross-sections of the first contact portion and the second contact portion are both located on the outside of the double-layer armored steel strip layer.

4. The double-layer armored steel strip layer as described in claim 2, characterized in that: The cross-sections of the first contact portion and the second contact portion are arc-shaped, and the centers of the cross-sections of the first contact portion and the second contact portion are both located inside the double-layer armored steel strip layer.

5. The double-layer armored steel strip layer as described in claim 2, characterized in that: The cross-sectional shape of both the first contact portion and the second contact portion is two arc segments, and the center of the arc of the cross-section at both ends of the outer steel strip is located inside the double-layer armored steel strip layer, while the center of the arc of the cross-section at both ends of the inner steel strip is located outside the double-layer armored steel strip layer.

6. The double-layer armored steel strip layer as described in claim 1, characterized in that: The cross-sections of the protrusions and depressions of the outer steel strip and the inner steel strip are V-shaped.

7. A cable, characterized in that, The double-layer armored steel strip layer as described in any one of claims 1-6 further includes: a conductor, insulation, an inner sheath, and an outer sheath; The insulation wraps around the outside of the conductor, the inner sheath wraps around the outside of the insulation, the inner steel strip and the outer steel strip are wrapped around the outside of the inner sheath in sequence, and the outer sheath wraps around the outside of the inner steel strip and the outer steel strip.

8. The cable as described in claim 7, characterized in that: It also includes conductor shielding, insulation shielding and metal shielding, wherein the conductor shielding is disposed between the conductor and the insulation, the insulation shielding is disposed on the outside of the insulation, and the metal shielding is disposed on the outside of the insulation shielding.

9. A cable as described in claim 8, characterized in that: The number of conductors and insulation is at least two, and the system also includes cable ties that are sleeved on the outside of all the conductors and insulation.

10. A cable as described in claim 9, characterized in that: It also includes a filler disposed between the insulation and the cable tie.

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