Photoelectric hybrid cable for park wiring

Abstract

The application discloses a photoelectric hybrid cable for park wiring, which comprises a metal conductor and an optical fiber loose tube, and an optical fiber is arranged in the optical fiber loose tube. The metal conductor comprises a first metal conductor and a second metal conductor, and both are of a layered structure. The first metal conductor and the second metal conductor are insulated and oppositely arranged. In a cross section, the first metal conductor and the second metal conductor are semicircular annular. In a length direction, the first metal conductor and the second metal conductor have wave bends. The first metal conductor and the second metal conductor form a surrounding space, and the optical fiber loose tube is fixedly arranged in the surrounding space. The photoelectric hybrid cable for park wiring disclosed by the application has lower power loss, is beneficial to increasing the transmission distance of the photoelectric hybrid cable, has little influence on the structural design of the optical fiber, is easy to design, and has the functions of reducing heat generation, electrostatic protection, lightning protection and heat dissipation due to the arranged special-shaped steel plastic shielding layer.

Description

Technical Field

[0001] This invention relates to the field of cable technology, and more specifically to a hybrid optical and electrical cable suitable for cabling in industrial parks. Background Technology

[0002] The following section introduces the existing technology and analyzes the problem. In analyzing the problem, the inventor's ideas are inevitably incorporated. Therefore, not all of the following content in the background technology necessarily belongs to the existing technology.

[0003] Fiber-optic hybrid cables are cables capable of transmitting both optical signals and electrical energy. In campus cabling, they are more adaptable to the deployment environment of signal equipment and offer greater ease of cabling. Existing fiber-optic hybrid cables primarily consist of an armor layer encasing metal conductors and optical fibers, supplemented with insulation, support, moisture-proofing, and other structural elements, as exemplified by invention patents CN105830174 B-Fiber-optic Composite Cable and CN102768883B-Fiber-optic Hybrid Cable.

[0004] Signal equipment such as WLAN APs, 5G small base stations, and video surveillance cameras in the park all require low-voltage power supplies, and in some scenarios, safety power supplies are needed. Low-voltage electricity suffers relatively high energy loss during transmission, thus limiting the cabling distance of existing hybrid fiber-optic cables. Therefore, existing hybrid fiber-optic cables cannot meet the direct cabling needs of large and super-large parks. Increasing the transmission distance would require either thickening the metal conductors or adding repeater stations, both of which increase construction costs. Adding repeater stations would also increase maintenance workload. Summary of the Invention

[0005] To address the aforementioned problems and overcome at least one deficiency, this invention proposes a hybrid optoelectronic cable that improves upon existing hybrid optoelectronic cables by increasing the transmission capacity per unit cross-sectional area of ​​the metal conductor, thereby increasing the transmission distance.

[0006] The technical solution adopted in this invention is as follows:

[0007] A hybrid fiber optic cable for campus cabling includes a metal conductor and a fiber optic loose tube. The fiber optic loose tube contains an optical fiber. The metal conductor includes a first metal conductor and a second metal conductor, both of which are layered structures. The first metal conductor and the second metal conductor are insulated from each other and are arranged opposite to each other.

[0008] In cross-section, the first metal conductor and the second metal conductor are semi-circular rings; along the length direction, the first metal conductor and the second metal conductor have wavy bends.

[0009] An enclosing space is formed between the first metal conductor and the second metal conductor, and the optical fiber loose tube is fixedly installed within the enclosing space.

[0010] A further improvement is that a central reinforcing member is fixedly provided at the center position of the enclosing space;

[0011] An inner polyethylene sheath is fixedly provided at a position close to the metal conductor in the enclosing space.

[0012] In a further improvement, the central reinforcing member is wrapped with a steel wire sleeve, and a plurality of optical fiber loose tubes are circumferentially fixed between the steel wire sleeve and the inner polyethylene sheath, and filled with water-blocking cable grease.

[0013] In a further improvement, in the cross-section of the optoelectronic hybrid cable, the metal conductor is sequentially provided with a middle polyethylene sheath, a steel-plastic composite layer, and an outer polyethylene sheath.

[0014] In a further improvement, in the cross-section, the first metal conductor and the second metal conductor are enclosed and surrounded by an irregularly shaped elastic insulating layer; the irregularly shaped elastic insulating layer includes a first irregularly shaped elastic insulating half-ring and a second irregularly shaped elastic insulating half-ring, which respectively surround the first metal conductor and the second metal conductor.

[0015] In cross-section, the first irregularly shaped elastic insulating half-ring and the second irregularly shaped elastic insulating half-ring are enclosed and surrounded by an irregularly shaped steel-plastic shielding layer; the irregularly shaped steel-plastic shielding layer is annular in cross-section, and two semi-annular cavities are formed on the body of the annular layer, namely the first semi-annular cavity and the second semi-annular cavity, which respectively contain the first irregularly shaped elastic insulating half-ring and the second irregularly shaped elastic insulating half-ring.

[0016] In a further improvement, the irregularly shaped elastic insulating layer is made of polyethylene.

[0017] A further improvement is that a central reinforcing member is fixedly provided at the center of the enclosing space; and a plurality of optical fiber loose tubes are fixedly provided in a ring between the central reinforcing member and the irregular elastic insulating layer.

[0018] A further improvement is that an outer polyethylene sheath is fixedly provided on the outward side of the irregularly shaped elastic insulating layer.

[0019] A further improvement is that the wave bend is a micro-wave bend, which means that the metal conductor undulates along its length, and the ratio of the wave crest to the wavelength is less than 0.05.

[0020] In a further improvement, the metal conductor employs a superimposed metal foil layer.

[0021] The beneficial effects of this invention are:

[0022] (1) Using the hybrid optical and electrical cable for campus cabling in this embodiment, with the same cross-sectional area of ​​the metal conductor, the power loss of this invention is lower, which is beneficial for increasing the transmission distance of the hybrid optical and electrical cable. The copper foil is thinner than the cylindrical guide and is distributed in a ring shape in the cross-section. On the one hand, this has little impact on the structural design of the optical fiber, requires minimal modification, and is easy to design; on the other hand, it helps to reduce the cross-sectional area of ​​the hybrid optical and electrical cable. 。

[0023] (2) The irregularly shaped steel-plastic shielding layer, for the first and second metal conductors, is equivalent to the charge inside the equipotential conductor. Although there is an electric field outside the equipotential body, changes in the external electric field have no effect on it. For the optical fiber, the optical fiber is equivalent to being inside the cavity of the equipotential body, and changes in the external electric field have no effect on it. Thus, it achieves the functions of reducing heat generation, electrostatic protection, lightning protection, and heat dissipation. Attached Figure Description

[0024] Figure 1 This is a three-dimensional schematic diagram of the fiber optic hybrid cable for campus cabling in Embodiment 1 of the present invention;

[0025] Figure 2 yes Figure 1 Side view;

[0026] Figure 3 These are schematic diagrams of the metal conductors in Embodiments 1 and 2 of the present invention;

[0027] Figure 4 This is a three-dimensional schematic diagram of the fiber optic hybrid cable for campus cabling in Embodiment 2 of the present invention;

[0028] Figure 5 yes Figure 3 Side view.

[0029] The labels for the attached figures are as follows:

[0030] 1. Steel wire reinforcement; 2. Steel wire sheath; 3. Optical fiber loose tube; 4. Colored optical fiber; 5. Inner polyethylene sheath; 6. Water-blocking cable paste; 71. First metal conductor; 72. Second metal conductor; 8. Polyethylene filler tape; 9. Middle polyethylene sheath; 10. Steel-plastic composite layer; 11. Outer polyethylene sheath; 12. Heat insulation layer; 13. First irregularly shaped elastic insulating half ring; 14. Second irregularly shaped elastic insulating half ring; 15. Irregularly shaped steel-plastic shielding layer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0032] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0034] The present invention will now be described in detail with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1-3 As shown, the hybrid optical and electrical cable for campus cabling provided in the first embodiment of the present invention is suitable for low-voltage DC power supply and communication in campuses.

[0037] The fiber optic hybrid cable used for cabling in the park has a steel wire reinforcement 1 at its center, which mainly serves as a support and provides tensile strength. The steel wire reinforcement 1 is wrapped with a steel wire sheath 2, which works in conjunction with the steel wire reinforcement 1 to improve its bending strength.

[0038] The outer layer of the steel wire sleeve 2 has twelve loose fiber tubes 3 arranged in a circumferential direction. Each loose fiber tube 3 has a colored optical fiber 4 fixed inside to realize signal transmission.

[0039] An inner polyethylene sheath 5 is fixed to the outer layer of the ring containing the fiber optic loose tube 3. The inner polyethylene sheath 5 and the fiber optic loose tube 3 are filled with water-blocking cable grease 6. The water-blocking cable grease 6 fills the gaps between the twelve fiber optic loose tubes 3. When water comes into contact with the break, it will expand rapidly to prevent water from entering the interior of the cable.

[0040] The outer layer of the inner polyethylene sheath 5 is tightly fitted with a first metal conductor and a second metal conductor, both of which are layered structures; the first metal conductor 71 and the second metal conductor 72 are insulated from each other and arranged opposite each other; in cross-section, the first metal conductor and the second metal conductor are semi-circular rings; along the length direction, the first metal conductor and the second metal conductor have wavy bends; an enclosing space is formed between the first metal conductor and the second metal conductor, and the optical fiber loose tube is fixedly arranged in the enclosing space.

[0041] Preferably, in this embodiment, the first metal conductor and the second metal conductor are made of copper foil.

[0042] Due to the "skin effect," copper foil has a stronger conductivity for the same conductor cross-sectional area, which helps reduce losses and increase transmission distance. However, because the fiber optic hybrid cable involves bending during installation, the tensile stress present in the copper foil at large bending angles can cause it to crack. Therefore, the copper foil is prefabricated with a continuous, slightly uneven surface. When bent, this uneven surface stretches, absorbing the tensile stress and preventing cracking.

[0043] To further improve transmission stability and conductivity, the conductor is designed as a multi-layer copper foil stacked and extruded structure, forming an overlay of metal foil layers. The copper foil surfaces should be oxidized to ensure insulation between the foils, allowing for individual conductivity and avoiding disruption of the skin effect.

[0044] In addition to surface oxidation treatment, copper foil can also be made by using single-sided conductive copper foil, which can also avoid the conduction between copper foils and thus prevent the "skin effect" from being destroyed.

[0045] Copper foil can be replaced by other low-cost, high-quality conductors such as aluminum foil.

[0046] It should be noted that in this embodiment, the cross-sections of the first metal conductor 71 and the second metal conductor 72 are described as semi-circular rings, which does not refer to a 180-degree semi-circle, but rather slightly less than 180 degrees. Therefore, when they are positioned relative to each other, a distance is left between the upper and lower edges of the first metal conductor 71 and the second metal conductor 72. This space is filled with an insulating medium. In this embodiment, a polyethylene filling tape 8 is used, with a thickness approximately equal to that of the first metal conductor 71 and the second metal conductor 72.

[0047] A middle polyethylene sheath 9 is provided on the outer layer of the first metal conductor 71 and the second metal conductor 72. The middle polyethylene sheath 9 and the inner polyethylene sheath 5 serve to fix and insulate the first metal conductor 71 and the second metal conductor 72.

[0048] The inner polyethylene sheath 5, the middle polyethylene sheath 9, and the copper foil are all elastic, so the inner polyethylene sheath 5 can be well bonded together with the first metal conductor 71 and the second metal conductor 72.

[0049] A further improvement is that the copper foil can be corrugated into a micro-wave. The micro-wave means that the first metal conductor 71 and the second metal conductor 72 undulate along their length, with the ratio of wave crest to wavelength less than 0.05. The micro-wave is used to maximize the adhesion between the inner polyethylene sheath 5, the middle polyethylene sheath 9, and the metal conductors without affecting the buffer tension.

[0050] A steel-plastic composite layer 10 and an outer polyethylene sheath 11 are sequentially fixed on the outer layer of the middle polyethylene sheath 9 to prevent damage caused by impact and protect the internal structure.

[0051] The fiber optic hybrid cable for campus cabling in this embodiment has lower power loss for the same cross-sectional area of ​​the metal conductor, which is beneficial for increasing the transmission distance of the fiber optic hybrid cable.

[0052] Compared to cylindrical guides, copper foil is thinner and has a ring-shaped distribution in the cross-section. On the one hand, it has little impact on the structural design of optical fibers, requires little modification, and is easy to design. On the other hand, it helps to reduce the cross-sectional area of ​​the optoelectronic hybrid cable.

[0053] Example 2

[0054] like Figure 4-5 As shown, the second embodiment of the present invention is an improvement on the first embodiment, used to adapt to the low-voltage AC power supply in the park and to conduct communication.

[0055] A heat insulation layer 12 is added between the metal conductor and the loose tube 3 of the optical fiber to prevent the heating of the first metal conductor 71 and the second metal conductor 72 from affecting the mechanical properties of the loose tube 3 of the optical fiber and the internal optical fiber, thereby affecting the signal propagation loss of the optical fiber.

[0056] In cross-section, the first metal conductor 71 and the second metal conductor 72 are enclosed and surrounded by an irregularly shaped elastic insulating layer; the irregularly shaped elastic insulating layer includes a first irregularly shaped elastic insulating half-ring 13 and a second irregularly shaped elastic insulating half-ring 14, which respectively surround the first metal conductor 71 and the second metal conductor 72.

[0057] In cross-section, the first irregularly shaped elastic insulating semi-ring 13 and the second irregularly shaped elastic insulating semi-ring 14 are enclosed and surrounded by an irregularly shaped steel-plastic shielding layer 15. The irregularly shaped steel-plastic shielding layer 15 is annular in cross-section, and forms two semi-annular cavities on the body of the annular structure, namely the first semi-annular cavity and the second semi-annular cavity. The first semi-annular cavity and the second semi-annular cavity respectively accommodate the first irregularly shaped elastic insulating semi-ring 13 and the second irregularly shaped elastic insulating semi-ring 14.

[0058] When transmitting alternating current, the steel wire reinforcement 1 typically generates inductive current and heat. However, due to the presence of the irregularly shaped steel-plastic shielding layer 15, its internal electric field is zero, and transmitting alternating current will not generate an electromagnetic effect at the steel wire reinforcement 1, causing it to heat up.

[0059] In the case of heat generation of the irregularly shaped steel-plastic shielding layer under electromagnetic influence, the outer ring of the irregularly shaped steel-plastic shielding layer is close to the outer layer of the cable, which helps to conduct the heat from the inner ring to the outer ring and dissipate it.

[0060] Because the irregularly shaped steel-plastic shielding layer is an equipotential body, it can also resist the damage of lightning strikes to the medium between the optical fiber and the conductive copper foil.

[0061] For the first metal conductor 71 and the second metal conductor 72, they are equivalent to charges located inside an equipotential conductor. Although an equipotential body has an external electric field, changes in the external electric field have no effect on them. For the optical fiber, the optical fiber is equivalent to being located inside the cavity of an equipotential body, and changes in the external electric field also have no effect on it. This achieves the functions of reducing heat generation, electrostatic protection, lightning strike protection, and heat dissipation.

[0062] The above description is merely a preferred embodiment of the present invention and does not limit the scope of patent protection of the present invention. Any equivalent structural transformations made based on the description and drawings of the present invention, whether directly or indirectly applied to other related technical fields, are similarly included within the scope of protection of the present invention.

Claims

1. A hybrid fiber optic cable for campus cabling, comprising a metal conductor and a fiber optic loose tube, wherein the fiber optic loose tube contains an optical fiber, characterized in that, The metal conductor includes a first metal conductor and a second metal conductor, both of which are layered structures; the first metal conductor and the second metal conductor are insulated from each other and are arranged opposite to each other; In cross-section, the first metal conductor and the second metal conductor are semi-circular rings; along the length direction, the first metal conductor and the second metal conductor have wavy bends. An enclosing space is formed between the first metal conductor and the second metal conductor, and the optical fiber loose tube is fixedly disposed within the enclosing space; The wave bend is a micro-wave bend, which means that the metal conductor undulates along its length, with the ratio of wave crest to wavelength being less than 0.

05.

2. The hybrid fiber optic cable for campus cabling as described in claim 1, characterized in that, A central reinforcing member is fixedly provided at the center position of the enclosed space; An inner polyethylene sheath is fixedly provided at a position close to the metal conductor in the enclosing space.

3. The hybrid fiber optic cable for campus cabling as described in claim 2, characterized in that, The central reinforcing member is wrapped with a steel wire sleeve, and a plurality of optical fiber loose tubes are circumferentially fixed between the steel wire sleeve and the inner polyethylene sheath, and filled with water-blocking cable grease.

4. The hybrid fiber optic cable for campus cabling as described in claim 3, characterized in that, In the cross-section of the optoelectronic hybrid cable, the metal conductor is sequentially provided with a middle polyethylene sheath, a steel-plastic composite layer, and an outer polyethylene sheath.

5. The hybrid fiber optic cable for campus cabling as described in claim 1, characterized in that, In cross-section, the first metal conductor and the second metal conductor are enclosed and surrounded by an irregularly shaped elastic insulating layer; the irregularly shaped elastic insulating layer includes a first irregularly shaped elastic insulating half-ring and a second irregularly shaped elastic insulating half-ring, which respectively surround the first metal conductor and the second metal conductor. In cross-section, the first irregularly shaped elastic insulating half-ring and the second irregularly shaped elastic insulating half-ring are enclosed and surrounded by an irregularly shaped steel-plastic shielding layer; the irregularly shaped steel-plastic shielding layer is annular in cross-section, and two semi-annular cavities are formed on the body of the annular layer, namely the first semi-annular cavity and the second semi-annular cavity, which respectively contain the first irregularly shaped elastic insulating half-ring and the second irregularly shaped elastic insulating half-ring.

6. The hybrid fiber optic cable for campus cabling as described in claim 5, characterized in that, The irregularly shaped elastic insulation layer is made of polyethylene.

7. The hybrid fiber optic cable for campus cabling as described in claim 5, characterized in that, A central reinforcing member is fixedly provided at the center of the enclosing space; a plurality of optical fiber loose tubes are fixedly provided in a ring between the central reinforcing member and the irregular elastic insulating layer.

8. The hybrid fiber optic cable for campus cabling as described in claim 7, characterized in that, An outer polyethylene sheath is fixedly provided on the outward side of the irregularly shaped elastic insulating layer.

9. The hybrid fiber optic cable for campus cabling as described in claim 1, characterized in that, The metal conductor is made of stacked metal foil layers.

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