A layer-twisted ribbon optical cable with a special-shaped structure

Abstract

The invention belongs to the field of cables, and in particular relates to a layer-twisted ribbon optical cable with a special-shaped structure. The cable comprises an outer sheath, a tape layer, at least three first loose tubes and a first reinforcement member. The cable is characterized in that an hourglass-shaped second cavity is formed inside the main body of the first loose tube, a connecting component is respectively provided on the left and right sides of the main body of the first loose tube, a semicircular edge guard is respectively provided on the upper and lower sides of the main body of the first loose tube, the two edge guards are respectively connected to the connecting components on the left and right sides, the edge guards surround the main body of the first loose tube inside, and form two first cavities, and two sub-cavities of the hourglass-shaped second cavity are provided with optical fiber ribbon stacking bodies; the cable has the advantages of simple structure, strong compressive performance, strong tensile performance, high fiber core density, loose tube main body is not easy to deform, optical fiber does not shift, and the like; the cable solves the problem that the single loose tube of the layer-twisted ribbon optical cable in the prior art has weak compressive performance.

Description

Technical Field

[0001] The invention belongs to the field of cables, and in particular relates to a layer-twisted ribbon optical cable with a special-shaped structure. Background Art

[0002] The use of twisted ribbon optical cable as a connection carrier for trunk networks is increasing year by year. Due to the high density of optical fibers in the loose tube of twisted ribbon optical cable, the requirements for the loose tube's lateral pressure resistance are higher.

[0003] In the prior art, CN111175920A discloses a communication optical cable for a 5G network, which has a central reinforcement member, a loose tube, a protective layer, an outer sheath, and an optical fiber. The loose tube is characterized in that the loose tube is composed of a first and a second protective wall, one end of the first protective wall is connected to the second protective wall, and the other end of the first protective wall is connected to the second protective wall. The loose tube is in the shape of a semi-cylinder, a cavity is formed between the first and second protective walls, the optical fiber is located in the cavity, both edges of the second protective wall are tangent to the inner wall of the protective layer, the vertical bisector plane of the second protective wall of the loose tube passes through the top straight line of the first protective wall of the loose tube and the axis of the central reinforcement member, and the top straight line of the first protective wall is in contact with the outer edge of the central reinforcement member; adjacent loose tubes are tangent.

[0004] The above-mentioned prior art has the following drawbacks: the loose tube body is easily flattened when directly subjected to force, thereby affecting the use of the optical cable. Summary of the invention

[0005] To solve the above problems, the purpose of the present invention is to disclose a layer-twisted ribbon optical cable with a special-shaped structure, which is achieved by adopting the following technical solutions.

[0006] The invention discloses a layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath, a tape layer, at least three first loose tubes and a first reinforcement member, wherein the first loose tube is twisted outside the first reinforcement member, the tape layer is located outside the twisted layer formed by the loose tube, and the outer sheath is extruded outside the tape layer. The invention is characterized in that the first loose tube is composed of a first loose tube body, an hourglass-shaped second cavity is formed inside the first loose tube body, the second cavity is composed of two sub-cavities, a connecting component is respectively provided on the left and right sides of the first loose tube body, a semicircular edge guard is respectively provided on the upper and lower sides of the first loose tube body, the left end of the upper edge guard is connected to the left connecting component, and the right end of the lower edge guard is connected to the right connecting component, the edge guard surrounds the first loose tube body inside and forms two first cavities, and the two sub-cavities of the hourglass-shaped second cavity are provided with optical fiber ribbon stacking bodies.

[0007] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that the optical fiber ribbon stack is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by at least two optical fibers being connected in parallel.

[0008] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that the optical fiber model is G.652, G.653, G.654, G.655, G.656, G.657, A1a, A1b or A1c.

[0009] In the above-mentioned twisted ribbon optical cable with a special-shaped structure, the two sub-cavities of the second cavity can be provided with optical fiber ribbons formed by combining different types of optical fibers, and different types of optical fibers can be placed; the edge guards on the upper and lower sides increase the lateral pressure resistance of the optical cable. When the optical cable is subjected to a large pressure, the edge guards are squeezed and deformed, while the internal first loose tube body is not subjected to force, so that the internal optical fiber transmission performance is not affected.

[0010] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that a second reinforcement member is provided in the first cavity, and the material of the second reinforcement member is steel wire or glass fiber rod.

[0011] In the above-mentioned twisted ribbon optical cable with a special-shaped structure, the tensile performance and compressive resistance of the first loose tube are enhanced, so that it can adapt to a more severe working environment.

[0012] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that a second supporting component is clamped between the two sub-cavities of the second cavity, and the material of the second supporting component is polypropylene.

[0013] In the above-mentioned twisted ribbon optical cable with a special-shaped structure, a second supporting component is clamped between the two sub-cavities of the second cavity, which can further enhance the pressure resistance of the first loose tube, and also prevent the first loose tube body from deforming the second cavity due to excessive pressure, thereby affecting the transmission performance of the internal optical fiber. It can also prevent the optical fiber ribbons of the two sub-cavities of the second cavity from shifting relative to each other, causing fiber compression, increasing the additional attenuation of the optical fiber, or fiber breakage.

[0014] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that a second loose tube is arranged in the first cavity, at least one optical fiber is arranged in the second loose tube, and the material of the second loose tube is polybutylene terephthalate or modified polypropylene.

[0015] The above-mentioned twisted ribbon optical cable with a special-shaped structure fully utilizes the space in the loose tube, increases the fiber core density of the optical cable, and enables the optical cable to have two connection modes, namely, optical fiber ribbon and optical cable, to meet different construction requirements.

[0016] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that each vertex on the upper and lower sides of the first loose tube body forms a first supporting component, and the first supporting component contacts the inner wall of the edge guard, further enhancing the compression resistance of the loose tube.

[0017] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that the outer sheath material is low-density polyethylene, medium-density polyethylene, high-density polyethylene, flame-retardant polyolefin or polyvinyl chloride.

[0018] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that the material of the first reinforcement member is steel wire or glass fiber rod.

[0019] The above-mentioned twisted ribbon optical cable with a special-shaped structure is characterized in that the first loose tube material is polybutylene terephthalate or modified polypropylene.

[0020] Therefore, the present invention has the beneficial effects of simple structure, strong compression resistance, strong tensile resistance, high fiber core density, loose tube body not easy to deform, optical fiber not shifting, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of Example 1 of the present invention.

[0022] Figure 2 It is a schematic diagram of the loose tube structure of Examples 1 to 4 of the present invention.

[0023] Figure 3 This is a structural diagram of Example 2 of the present invention.

[0024] Figure 4 This is a structural diagram of Example 3 of the present invention.

[0025] Figure 5 This is a structural schematic diagram of Example 4 of the present invention.

[0026] Figure 6 This is a structural diagram of Example 5 of the present invention.

[0027] In the figure: 1. outer sheath, 2. tape layer, 3. first loose tube, 31. edge protection, 32. first cavity, 33. first loose tube body, 34. second cavity, 35. connecting component, 36. first supporting component, 4. optical fiber ribbon stack body, 5. first reinforcement member, 6. second reinforcement member, 7. second supporting member, 8. second loose tube. DETAILED DESCRIPTION

[0028] Example 1

[0029] Please see Figure 1 and Figure 2 A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath 1, a tape layer 2, at least three first loose tubes 3 and a first reinforcement member 5, wherein the first loose tube 3 is twisted outside the first reinforcement member 5, the tape layer 2 is located outside the twisted layer formed by the loose tube 3, and the outer sheath 1 is extruded outside the tape layer 2, characterized in that the first loose tube 3 is composed of a first loose tube body 33, an hourglass-shaped second cavity 34 is formed inside the first loose tube body 33, and the second cavity 34 is composed of two sub-cavities, and the first loose tube body 33 is about A connecting component 35 is provided on each side, and a semicircular edge guard 31 is provided on each upper and lower sides of the first loose tube body 33. The left end of the upper edge guard 31 is connected to the left connecting component 35, and the right end of the lower edge guard 31 is connected to the right connecting component 35. The edge guard 31 surrounds the first loose tube body 33 inside and forms two first cavities 32. The two sub-cavities of the hourglass-shaped second cavity 34 are provided with an optical fiber ribbon stacking body 4, and the optical fiber ribbon stacking body 4 is composed of at least two optical fiber ribbons, and the optical fiber ribbon is composed of at least two optical fibers.

[0030] In this embodiment, the two sub-cavities of the second cavity 34 can be provided with optical fiber ribbons formed by different types of optical fibers, and different types of optical fibers can be placed in the optical cable; the edge guards 31 on the upper and lower sides increase the lateral pressure resistance of the optical cable. When the optical cable is subjected to a large pressure, the edge guards 31 are squeezed and deformed, while the internal first loose tube body 33 is not subjected to force, so that the internal optical fiber transmission performance is not affected.

[0031] Example 2

[0032] Please see Figure 2 and Figure 3 A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath 1, a tape layer 2, at least three first loose tubes 3 and a first reinforcement member 5, wherein the first loose tube 3 is twisted outside the first reinforcement member 5, the tape layer 2 is located outside the twisted layer formed by the loose tube 3, and the outer sheath 1 is extruded outside the tape layer 2, characterized in that the first loose tube 3 is composed of a first loose tube body 33, an hourglass-shaped second cavity 34 is formed inside the first loose tube body 33, the second cavity 34 is composed of two sub-cavities, and the left and right sides of the first loose tube body 33 are each provided with a connecting Component 35, a semicircular edge guard 31 is respectively provided on the upper and lower sides of the first loose tube body 33, the left end of the upper edge guard 31 is connected to the left connecting component 35, and the right end of the lower edge guard 31 is connected to the right connecting component 35, the edge guard 31 surrounds the first loose tube body 33 inside, and forms two first cavities 32, the two sub-cavities of the hourglass-shaped second cavity 34 are provided with an optical fiber ribbon stacking body 4, the optical fiber ribbon stacking body 4 is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by at least two optical fibers and a second reinforcement member 6 is provided in the first cavity 32.

[0033] The twisted ribbon optical cable with a special-shaped structure described in the above embodiment is characterized in that the material of the second reinforcement member 6 is steel wire or glass fiber rod.

[0034] This embodiment enhances the tensile strength and compressive strength of the first loose tube 3 , so that it can adapt to a more severe working environment.

[0035] Example 3

[0036] Please see Figure 2 and Figure 4 A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath 1, a tape layer 2, at least three first loose tubes 3 and a first reinforcement member 5, wherein the first loose tube 3 is twisted outside the first reinforcement member 5, the tape layer 2 is located outside the twisted layer formed by the loose tube 3, and the outer sheath 1 is extruded outside the tape layer 2, characterized in that the first loose tube 3 is composed of a first loose tube body 33, an hourglass-shaped second cavity 34 is formed inside the first loose tube body 33, the second cavity 34 is composed of two sub-cavities, a connecting component 35 is provided on each side of the first loose tube body 33, and the first loose tube body 3 is provided with a connecting component 35. A semicircular edge guard 31 is provided on each of the upper and lower sides, the left end of the upper edge guard 31 is connected to the left connecting component 35, and the right end of the lower edge guard 31 is connected to the right connecting component 35. The edge guard 31 surrounds the first loose tube body 33 inside and forms two first cavities 32. The two sub-cavities of the hourglass-shaped second cavity 34 are provided with an optical fiber ribbon stacking body 4, the optical fiber ribbon stacking body 4 is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by at least two optical fibers being connected in parallel. A second reinforcing member 6 is provided in the first cavity 32, and a second supporting member 7 is clamped between the two sub-cavities of the second cavity 34.

[0037] The twisted ribbon optical cable with a special-shaped structure described in the above embodiment is characterized in that the material of the second supporting component 7 is polypropylene.

[0038] In this embodiment, a second supporting member 7 is provided between the two sub-cavities of the second cavity 34, which can further enhance the pressure resistance of the first loose tube 3, and also prevent the first loose tube body 33 from deforming the second cavity 34 due to excessive pressure, thereby affecting the transmission performance of the internal optical fiber. It can also prevent the optical fiber ribbons of the two sub-cavities of the second cavity 34 from shifting relative to each other, thereby causing fiber compression, increased additional attenuation of the optical fiber, or fiber breakage.

[0039] Example 4

[0040] Please see Figure 2 and Figure 5A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath 1, a tape layer 2, at least three first loose tubes 3 and a first reinforcement member 5, wherein the first loose tube 3 is twisted outside the first reinforcement member 5, the tape layer 2 is located outside the twisted layer formed by the loose tube 3, and the outer sheath 1 is extruded outside the tape layer 2, characterized in that the first loose tube 3 is composed of a first loose tube body 33, an hourglass-shaped second cavity 34 is formed inside the first loose tube body 33, the second cavity 34 is composed of two sub-cavities, a connecting component 35 is respectively provided on the left and right sides of the first loose tube body 33, and the first loose tube body 33 is provided with a connecting component 35. A semicircular edge guard 31 is provided on the upper and lower sides of the sleeve body 33, the left end of the upper edge guard 31 is connected to the left connecting component 35, and the right end of the lower edge guard 31 is connected to the right connecting component 35. The edge guard 31 surrounds the first loose sleeve body 33 inside and forms two first cavities 32. The two sub-cavities of the hourglass-shaped second cavity 34 are provided with an optical fiber ribbon stacking body 4, and the optical fiber ribbon stacking body 4 is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by at least two optical fibers. A second loose sleeve 8 is provided in the first cavity 32, and at least one optical fiber is provided in the second loose sleeve 8.

[0041] The twisted ribbon optical cable with a special-shaped structure described in the above embodiment is characterized in that the material of the second loose tube 8 is polybutylene terephthalate or modified polypropylene.

[0042] In this embodiment, the space in the loose tube is fully utilized to increase the fiber core density of the optical cable. At the same time, the optical cable can have two connection modes, namely, optical fiber ribbon and optical cable, to meet different construction requirements.

[0043] Example 5

[0044] Please see Figure 2 and Figure 6A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath 1, a tape layer 2, at least three first loose tubes 3 and a first reinforcement member 5, wherein the first loose tube 3 is twisted outside the first reinforcement member 5, the tape layer 2 is located outside the twisted layer formed by the loose tube 3, and the outer sheath 1 is extruded outside the tape layer 2, characterized in that the first loose tube 3 is composed of a first loose tube body 33, each vertex on the upper and lower sides of the first loose tube body 33 forms a first supporting member 36, an hourglass-shaped second cavity 34 is formed inside the first loose tube body 33, the second cavity 34 is composed of two sub-cavities, and the left and right sides of the first loose tube body 33 are respectively provided with a connecting portion Part 35, a semicircular edge guard 31 is respectively provided on the upper and lower sides of the first loose tube body 33, the left end of the upper edge guard 31 is connected to the left connecting component 35, and the right end of the lower edge guard 31 is connected to the right connecting component 35, the edge guard 31 surrounds the first loose tube body 33 inside, and forms two first cavities 32, the first supporting member 36 contacts the inner wall of the edge guard 31, the two sub-cavities of the hourglass-shaped second cavity 34 are provided with an optical fiber ribbon stacking body 4, the optical fiber ribbon stacking body 4 is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by at least two optical fibers and belts, a second loose tube 8 is provided in the first cavity 32, and at least one optical fiber is provided in the second loose tube 8.

[0045] The twisted ribbon optical cable with a special-shaped structure described in the above embodiment is characterized in that the material of the second loose tube 8 is polybutylene terephthalate or modified polypropylene.

[0046] This embodiment further enhances the compressive resistance of the loose tube 3 .

[0047] The layer-twisted ribbon optical cable with a special-shaped structure described in any of the above embodiments is characterized in that the material of the outer sheath 1 is low-density polyethylene, medium-density polyethylene, high-density polyethylene, flame-retardant polyolefin, or polyvinyl chloride.

[0048] A twisted ribbon optical cable with a special-shaped structure as described in any of the above embodiments is characterized in that the optical fiber model is G.652, G.653, G.654, G.655, G.656, G.657, A1a, A1b or A1c.

[0049] The twisted ribbon optical cable with a special-shaped structure described in any of the above embodiments is characterized in that the material of the first reinforcement member 5 is steel wire or glass fiber rod.

[0050] The layer-twisted ribbon optical cable with a special-shaped structure described in any of the above embodiments is characterized in that the material of the first loose tube 3 is polybutylene terephthalate or modified polypropylene.

[0051] The loose tube 3 in the present invention has a shape different from that in the prior art, is easy to strip, does not require professional tools, and greatly improves the operating efficiency.

[0052] The invention solves the problem that the single loose tube of the middle-layer twisted ribbon optical cable in the prior art has poor compression resistance.

[0053] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A layer-twisted ribbon optical cable with a special-shaped structure, comprising an outer sheath (1), a tape layer (2), at least three first loose tubes (3) and a first reinforcement member (5), wherein the first loose tube (3) is twisted outside the first reinforcement member (5), the tape layer (2) is located outside the twisted layer formed by the first loose tube (3), and the outer sheath (1) is extruded outside the tape layer (2), characterized in that: The first loose tube (3) is composed of a first loose tube body (33), an hourglass-shaped second cavity (34) is formed inside the first loose tube body (33), the second cavity (34) is composed of two sub-cavities, a connecting component (35) is respectively provided on the left and right sides of the first loose tube body (33), a semicircular edge guard (31) is respectively provided on the upper and lower sides of the first loose tube body (33), the left end of the upper edge guard (31) is connected to the left connecting component (35), and the right end of the lower edge guard (31) is connected to the right connecting component (35), the edge guard (31) surrounds the first loose tube body (33) inside and forms two first cavities (32), and the two sub-cavities of the hourglass-shaped second cavity (34) are provided with optical fiber ribbon stacking bodies (4); A second reinforcing member (6) is provided in the first cavity (32), and the material of the second reinforcing member (6) is steel wire or glass fiber rod; a second supporting member (7) is clamped between the two sub-cavities of the second cavity (34), and the material of the second supporting member (7) is polypropylene.

2. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: A second loose tube (8) is arranged in the first cavity (32), at least one optical fiber is arranged in the second loose tube (8), and the material of the second loose tube (8) is polybutylene terephthalate or modified polypropylene.

3. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: Each vertex angle on the upper and lower sides of the outside of the first loose tube body (33) forms a first supporting component (36), and the first supporting component (36) is in contact with the inner wall of the edge protector (31).

4. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: The material of the outer protective layer (1) is low-density polyethylene, medium-density polyethylene, high-density polyethylene, flame-retardant polyolefin or polyvinyl chloride.

5. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: The material of the first reinforcement member (5) is steel wire or glass fiber rod.

6. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: The material of the first loose tube (3) is polybutylene terephthalate or modified polypropylene.

7. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 1, characterized in that: The optical fiber ribbon stack (4) is composed of at least two optical fiber ribbons, and the optical fiber ribbon is formed by combining at least two optical fibers.

8. The layer-twisted ribbon optical cable with a special-shaped structure according to claim 7, characterized in that: The model of the optical fiber is G.652, G.653, G.654, G.655, G.656, G.657, A1a, A1b or A1c.

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