Indoor flame-retardant air-blowing optical cable

Abstract

The utility model discloses an indoor flame-retardant air-blowing optical cable, which comprises an outer sheath, an optical unit and reinforcers, and is characterized in that the reinforcers are uniformly distributed on the outer peripheral surface of the outer sheath and are partially exposed outside; the center of the outer sheath is provided with a multi-edge cavity. An optical unit or an electric unit is embedded in the outer sheath in a range between two adjacent reinforcing members. The indoor flame-retardant air-blowing optical cable is more excellent in comprehensive performance, the unique central multi-edge cavity structure can play a good buffering role and can effectively reduce the size of the optical cable, meanwhile, the partially exposed structure of the reinforcer also effectively reduces the contact area between the optical cable and the inner wall of a pipeline, the air-blowing or pipe-penetrating efficiency can be improved, and the service life of the optical cable is prolonged. The construction time is shortened.

Description

Technical Field

[0001] The utility model relates to a communication facility, in particular to a communication cable. Background Art

[0002] With the emergence of new concepts such as cloud computing and Internet of Things, the demand for data centers and data communication has increased significantly, further promoting the development of F5G. With the continuous implementation of industry application scenarios and the continuous promotion of fixed network upgrade infrastructure construction, indoor cables and optical and electrical composite cables, as an important part of them, have also developed rapidly.

[0003] At present, the mainstream indoor optical and electrical composite cables on the market are relatively large in size. During the actual construction process, the utilization rate of pipelines is low, and the construction cost and subsequent maintenance cost are relatively expensive, which is not conducive to long-term development; at the same time, the large size is not easy to install in a narrow space. Forcible pulling and dragging are also very likely to cause damage to the optical cable; in addition, there are many corners in indoor construction, and the bending radius in some areas is small. If the optical cable is too large or too hard, the loss of the optical cable will increase during construction at the corners, which is not conducive to signal transmission. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide an indoor gas-blown optical cable with excellent comprehensive performance. Its unique central multi-edge cavity structure can not only play a good buffering role, but also effectively reduce the size of the optical cable. At the same time, the partially exposed structure of the strengthening member also effectively reduces the contact area between the optical cable and the inner wall of the pipeline, which can improve the efficiency of gas blowing or pipe threading and shorten the construction time.

[0005] The technical solution adopted by the utility model to solve the above technical problem is as follows:

[0006] An indoor gas-blocking and gas-blown optical cable includes an outer sheath, an optical unit and a strengthening member. There are three or four or five strengthening members, and a plurality of the strengthening members are arranged on the outer peripheral surface of the outer sheath in a uniformly distributed manner. Part of the strengthening member is embedded in the outer sheath and part is exposed outside; a multi-edge cavity extending axially is arranged in the center of the outer sheath, and the edges of the multi-edge cavity correspond to the positions of the strengthening members one by one, so that the thinnest wall thickness of the outer sheath is formed at each pair of edges and the strengthening member; in the cross section of the multi-edge cavity, the sides between the corners are straight edges or arc edges sunken towards the axis, and the lengths of all sides are equal;

[0007] An optical unit or an electrical unit is embedded in the outer sheath within the range between two adjacent strengthening members, and the optical cable is provided with at least one optical unit.

[0008] Further, the optical unit is a tight-buffered fiber or a multi-core micro-cluster.

[0009] Further, three strengthening members are provided.

[0010] Further, two electrical units and one optical unit are embedded in the outer sheath.

[0011] Further, an inner sheath made of a soft elastic material is filled and arranged in the multi-faceted cavity, and an inner protection cavity is arranged at the center of the inner sheath.

[0012] Further, a plurality of arc-shaped folds protruding towards the axis and extending axially are evenly distributed on the inner wall of the inner sheath.

[0013] Further, the part of the reinforcing member embedded in the outer sheath accounts for 40%-70% of the main body.

[0014] Further, the reinforcing member is a fiber-reinforced composite material reinforcing member with a diameter of 0.5-0.7 mm.

[0015] Further, the electrical unit is composed of seven strands of pure copper conductors with a nominal diameter of 0.38 mm stranded together or a single-strand conductor with a nominal wire diameter of not less than 1.0 mm.

[0016] Further, the outer sheath is an outer sheath made of flame-retardant polyvinyl chloride or low-smoke and halogen-free flame-retardant material, the outer diameter of the outer sheath is 4.2-6.0 mm, the thickness of the thinnest wall of the outer sheath is 0.4-0.6 mm, the radius of the inner protection cavity is 0.2-0.3 mm, and the thickness of the thinnest wall of the inner sheath is 0.3-0.4 mm.

[0017] In the utility model, through the unique structure of the central multi-faceted cavity, several optical units and electrical units of the optical cable are completely isolated and embedded in different units of the outer sheath. The central multi-faceted cavity not only plays a role in isolating the optical and electrical units, but also can play a good role in energy absorption and buffering when the optical cable is longitudinally impacted or laterally pressed, thereby prolonging the service life of the optical cable.

[0018] By embedding the optical and electrical units in the outer sheath, the distance between each unit is maximally increased. At the same time, the multi-faceted cavity (especially after filling the inner sheath) has a good insulation effect. In this way, the electrical unit part can adopt the way of bare copper, which can effectively reduce the size of the optical cable by at least more than 20%. This can not only reduce the manufacturing cost of the optical cable, but also further improve the utilization rate of the pipeline during construction.

[0019] In the utility model, the reinforcing member is arranged on the outer peripheral surface of the outer sheath and partially exposed. The advantages of this unique structure are as follows:

[0020] 1. It not only improves the stiffness of the optical cable, but also effectively reduces the contact area between the optical cable and the inner wall of the pipeline, can improve the efficiency of air blowing or pipe threading, and shorten the construction time.

[0021] 2. After the optical cable reaches the designated area, the strength member can be quickly separated from the optical cable. After separation, the stiffness of the optical cable decreases, thereby obtaining good flexibility (as Figure 2 shown), and it can be coiled and stored in a narrow space without affecting the transmission performance of the optical cable.

[0022] 3. After the strength member is separated from the optical cable, a tear opening is naturally formed by matching the strength member area with the edge of the multi-faceted cavity. Without using special tools, the optical unit and the electrical unit can be quickly separated.

[0023] The multi-faceted cavity (the inner protection cavity after setting the inner sheath) of the optical cable of the present utility model can be used as a reserved space, which is convenient for fiber threading during subsequent maintenance. When the inner protection cavity after setting the inner sheath is used with a guiding head during air blowing or pipe threading construction, it can be used as a structure to stabilize the guiding head. Without using glue for fixation, the guiding head can be reused, which is more economical and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the indoor flame-retardant air-blown optical cable of the present utility model.

[0025] Figure 2 is a schematic diagram of the indoor flame-retardant air-blown optical cable of the present utility model after separating the strength member from the optical cable.

[0026] In the figure:

[0027] 1. Inner protection cavity 2. Inner layer sheath

[0028] 3. Optical unit 41. Electrical unit A

[0029] 42. Electrical unit B 5. Strength member

[0030] 6. Outer sheath 601. Triangular cavity DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present utility model will be further described below with reference to the drawings and embodiments.

[0032] Figure 1An indoor flame-retardant gas-blown optical cable is shown, which includes an outer sheath 6, an optical unit 3 and a strengthening member 5. The outer sheath is a flame-retardant polyvinyl chloride or low-smoke halogen-free flame-retardant material outer sheath, with a minimum elongation at break of 150%, a minimum breaking strength of 12.5 MPa, and a maximum coefficient of friction of 0.2. The outer diameter of the outer sheath is 4.2 - 6.0 mm. There are three strengthening members 5, which are arranged on the outer peripheral surface of the outer sheath 6 in a uniformly distributed manner. The strengthening member 5 is a fiber-reinforced composite material strengthening member with a diameter of 0.5 - 0.7 mm. Part of the strengthening member 5 is embedded in the outer sheath 6 and part is exposed outside. The part of the strengthening member 5 embedded in the outer sheath 6 accounts for 40% - 70% of the main body. Because the outer sheath 6 is finally extruded and formed, the outer sheath 6 and the strengthening member 5 can be adhesively fixed during the forming process. Therefore, when the part of the strengthening member 5 embedded in the outer sheath 6 is less than 50%, a stable optical cable structure can still be formed.

[0033] A triangular prism cavity 601 extending axially is provided in the center of the outer sheath 6. The edges of the triangular prism cavity 601 correspond to the positions of the strengthening members 5 one by one, so that the thinnest part of the outer sheath wall thickness is formed at each pair of edges and the strengthening members 5, and its thickness is at least 0.4 mm, generally 0.4 - 0.6 mm. In the cross-section of the triangular prism cavity 601, the sides between the corners are straight edges (or can be arc edges sunken towards the axis), and the lengths of all sides are equal.

[0034] An optical unit 3 or an electrical unit is embedded in the outer sheath 6 within the range between two adjacent strengthening members 5. This optical cable is provided with one optical and electrical unit 3, two electrical units (electrical unit A 41 and electrical unit B 42). The optical unit 3 can select a 0.9 mm tight-buffered fiber or a multi-core microcluster, and its fiber type preferably has a G.657 fiber with bending resistance. The cross-sections of the electrical units are all circular or equivalent to circular, and are composed of seven-strand nominal 0.38 mm pure copper conductors stranded together or a single-strand conductor with a nominal wire diameter not less than 1.0 mm.

[0035] A color ring can be coated on the surface of the strengthening member 5 on the side opposite to the electrical unit A 41 or a different color can be used as a mark to distinguish the electrical unit A 41 and the electrical unit B 42, which is more convenient for laying construction.

[0036] In order to obtain better performance, an inner sheath 2 filled with a soft elastic material is provided in the multi-prism cavity 601. An inner protection cavity 1 is provided in the center of the inner sheath 2. The radius of the inner protection cavity 1 is 0.2 - 0.3 mm, and the thickness of the thinnest part of the inner sheath 2 is 0.3 - 0.4 mm, so that better insulation protection for the electrical unit can be obtained.

[0037] Preferably, the inner wall of the inner sheath 1 may be evenly distributed with a plurality of arc-shaped folds protruding axially towards the axis. In this way, the inner protection cavity 1 has more elasticity. On the one hand, it can be used as a reserved space for fiber threading during subsequent maintenance; on the other hand, when using a guiding head during air blowing or pipe threading construction, the guiding head can be stabilized without using glue, enabling the repeated use of the guiding head, which is more economical and environmentally friendly.

[0038] In the structure of the three reinforcing members 5 in the above embodiment, four or five reinforcing members are also used in special cases. Correspondingly, the triangular cavity 601 is matched to a quadrangular or pentagonal cavity. Similarly, the edges of the multi-sided cavity correspond to the positions of the reinforcing members 5 one by one. A light unit 3 or an electrical unit is embedded in the outer sheath 6 within the range between two adjacent reinforcing members 5. The optical cable is provided with at least one light unit 3.

[0039] Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications and improvements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model shall be defined by the claims.

Claims

1. An indoor flame-retardant gas-blown optical cable, comprising an outer sheath, an optical unit and a reinforcement member, characterized in that: There are three, four or five reinforcing members, and several of the reinforcing members are evenly distributed on the outer peripheral surface of the outer sheath, and the reinforcing members are partially embedded in the outer sheath and partially exposed outside; an axially extending multi-faceted cavity is provided in the center of the outer sheath, and the edges of the multi-faceted cavity correspond to the positions of the reinforcing members one by one, so that each pair of edges and the reinforcing members form the thinnest part of the outer sheath wall thickness; the edges between the corners in the cross section of the multi-faceted cavity are straight edges or arc-shaped edges concave toward the axis, and the lengths of the edges are equal; An optical unit or an electrical unit is embedded in the outer sheath between two adjacent strength members, and the optical cable is provided with at least one optical unit.

2. The optical cable according to claim 1, characterized in that: The optical unit is a tight-buffered fiber or a multi-core micro-cluster.

3. The optical cable according to claim 1, characterized in that: Three reinforcement members are provided.

4. The optical cable according to claim 3, characterized in that: Two electrical units and one optical unit are embedded in the outer sheath.

5. The optical cable according to any one of claims 1 to 4, characterized in that: The multi-faceted cavity is filled with an inner sheath made of soft elastic material, and an inner protective cavity is arranged at the center of the inner sheath.

6. The optical cable according to claim 5, characterized in that: The inner wall of the inner layer sheath is uniformly distributed with a plurality of arc-shaped folds extending along the axial direction and protruding toward the axis center.

7. The optical cable according to claim 6, characterized in that: The portion of the reinforcement member embedded in the outer jacket accounts for 40%-70% of the main body.

8. The optical cable according to claim 6, characterized in that: The reinforcement is a fiber reinforced composite reinforcement, and its diameter is 0.5-0.7 mm.

9. The optical cable according to claim 6, characterized in that: The electrical unit is a conductor formed by twisting seven strands of nominal 0.38 mm pure copper conductors or a conductor with a single strand nominal wire diameter of not less than 1.0 mm.

10. The optical cable according to claim 5, characterized in that: The outer sheath is a flame retardant polyvinyl chloride or low smoke halogen free flame retardant material outer sheath, the outer diameter of the outer sheath is 4.2-6.0mm, the thickness of the outer sheath at the minimum wall thickness is 0.4-0.6mm, the radius of the inner protective cavity is 0.2-0.3mm, and the thickness of the inner sheath at the minimum wall thickness is 0.3-0.4mm.

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