Air-blown microcable

Abstract

The present invention belongs to the field of optical cables, and discloses an air-blown microcable, which has an outer sheath and a loose sleeve. The present invention is characterized in that the outer sheath is composed of an outer sheath body, and a plurality of grooves and protrusions are formed at intervals along the circumference of the cable on the outer side of the outer sheath body, and a through hole is formed axially inside the outer sheath body corresponding to each groove, and a plurality of vents are also formed on the outer sheath body corresponding to each groove, and a ventilating component is also provided above each vent. The ventilating component is in the shape of a "cat's ear", and the bottom edges are all connected to the outer wall of the outer sheath body, the opening direction of the ventilating component is along the groove, and the opening directions of all the ventilating components are the same. The present invention has the beneficial effects of simple structure, small optical cable friction coefficient, high air blowing efficiency, low cost, light weight, good softness, good impact resistance, and the like.

Description

Technical Field

[0001] The invention belongs to the field of optical cables, and in particular relates to an air-blown microcable. Background Art

[0002] With the large-scale promotion of domestic 5G construction, the demand for optical cables is increasing, and operators have increasingly stringent requirements on the water permeability performance of optical cables.

[0003] In the prior art, CN207867086U discloses a fully dry air-blown micro optical cable, which belongs to the field of optical cable communication technology. The fully dry air-blown micro optical cable comprises a sheath, a loose tube, an optical fiber and a water-blocking yarn. Among them, the inner circumferential wall of the sheath is surrounded by an inner cavity extending along the axial direction, and the outer circumferential wall of the sheath is provided with a plurality of grooves extending along the axial direction; the loose tube is arranged in the inner cavity of the sheath; the optical fiber is arranged in the loose tube; and the water-blocking yarn is arranged in the loose tube. The optical cable of the present invention does not use jelly optical cable, which is light in weight and more convenient and quick to connect. During the air blowing process, the optical cable is more easily suspended in the center of the pipeline used for laying the optical cable, thereby improving the air blowing performance of the optical cable. The outer surface of the optical cable is provided with grooves, which can increase the air blowing distance and improve the air blowing performance.

[0004] Another example in the prior art, such as CN103513377A discloses an ultra-micro air-blown optical cable, including at least one loose tube, a plurality of optical fibers are wrapped in the loose tube, and the loose tube is filled with fiber paste; an outer sheath is provided outside the loose tube, and the outer side wall of the outer sheath is annularly provided with a plurality of serrated teeth, and the cross section of the teeth is trapezoidal. When using the present invention, a small-diameter optical fiber and a special plastic are used as the loose tube, the outer diameter of the optical cable is reduced, and the smooth circular outer sheath is improved to a surface tooth type outer sheath, which significantly improves the air-blowing performance of the micro cable, increases the optical fiber density in the communication pipeline, provides a low-cost solution for the expansion of the existing communication network and the construction of a large-capacity network, and the additional attenuation of the optical fiber after laying is also significantly reduced. The present invention has the advantages of simple structure, reasonable arrangement, and low manufacturing cost.

[0005] The applicant believes that the outer sheath structure of the above-mentioned prior art still has room for further improvement, so that the optical cable can obtain a better air blowing effect, and at the same time, by improving the outer sheath structure, other properties of the optical cable can be improved. Summary of the invention

[0006] To solve the above problems, the purpose of the present invention is to disclose an air-blown microcable, which is implemented by adopting the following technical solutions.

[0007] An air-blown microcable comprises an outer sheath and at least one loose tube. When the number of the loose tubes is one or two, the outer sheath is extruded on the outer side of a cable core formed by one or two loose tubes. When the number of the loose tubes is greater than or equal to three, a central reinforcement is further arranged between the cable cores formed by the three loose tubes. The loose tubes are located around the central reinforcement. At least one optical unit is arranged in the loose tube. The outer sheath is characterized in that the outer sheath is composed of an outer sheath body, a plurality of grooves and protrusions are formed at intervals along the circumference of the cable on the outer side of the outer sheath body, a through hole is formed inside the outer sheath body corresponding to each groove along the axial direction, and a through hole is formed on the outer sheath body corresponding to each groove. A plurality of vents are also formed, and a vent component is provided above each vent. The vent component is in the shape of a "cat's ear", and the bottom edge is completely connected to the outer wall of the outer sheath body. The opening direction of the vent component is along the groove, and the opening direction of all vent components is the same. The material of the vent component is a flexible film. When the vent component is closed, the vent component covers the vent. When the vent component is opened, the height of the vent component is lower than the height of the plane formed by the tops of the two corresponding adjacent protrusions and the plane of the groove where the vent component is located, so that when the optical cable is laid in the pipeline by air blowing, the vent component will not touch the pipeline wall, thereby reducing the friction between the vent component and the pipeline wall.

[0008] The above-mentioned air-blown microcable is characterized in that the central reinforcement member is phosphated steel wire or stainless steel wire or glass fiber rod.

[0009] The air-blown microcable described above is characterized in that a first magnet is provided on the inner side of the top of the ventilation component, and a second magnet corresponding to the first magnet is provided on the groove, so that the ventilation component can be automatically closed.

[0010] The above-mentioned air-blown microcable is characterized in that the protrusions form multiple peaks and troughs along the axial direction of the optical cable, further reducing the friction between the outer sheath and the pipe wall.

[0011] The above-mentioned air-blown microcable is characterized in that the height difference between the crest and the trough is in the range of [0.1mm, 0.3mm].

[0012] The above-mentioned air-blown microcable is characterized in that the main materials of the outer sheath are, by weight: polyethylene 100, graphite powder 0.1, ceramic powder 1.2, iron powder 1.0, talcum powder 0.08, polytetrafluoroethylene powder 0.8, polyvinyl chloride rubber 0.2, acrylonitrile-butadiene-styrene 0.06, antioxidant 0.9, glass fiber 0.8, asbestos 0.2, quartz 0.1, and silicate 0.4.

[0013] The above-mentioned air-blown micro-cable is characterized in that the suction force of the first magnet and the second magnet is smaller than the thrust of the airflow passing through the vent on the wind-shaking component.

[0014] The above-mentioned air-blown microcable is characterized in that the optical unit material is optical fiber.

[0015] In the above-mentioned air-blown microcable, the optical fiber model is G.652, G.653, G.654, G.655 or G.656.

[0016] The above-mentioned air-blown microcable is characterized in that the loose tube material is polybutylene terephthalate or modified polypropylene.

[0017] The above-mentioned air-blown microcable is characterized in that a dry water-blocking method is adopted in the optical cable core.

[0018] When in use, glue is used to seal one end of all the through holes in the outer sheath of the optical cable, and this end is passed through the air blowing device into the air blowing pipeline. When the air blowing device is turned on, the gas generated by the air blowing device not only flows along the surface of the outer sheath of the optical cable, but also enters the through holes, pushing the optical cable to be laid in the air blowing pipeline in the sheath. At the same time, the strong air pressure causes the gas to pass through the vent. When the vent component above the vent is blown up, the thrust of the gas on the optical cable is increased, thereby improving the laying efficiency.

[0019] In the present invention, the through holes increase the contact surface between the airflow and the optical cable, and improve the traction of the airflow on the optical cable. The more through holes there are, the greater the traction of the airflow on the optical cable. At the same time, the weight of the optical cable is reduced, the efficiency of the air-blowing laying of the optical cable is improved, the weight is also reduced, the transportation is convenient, and the cost is saved. The through holes can also improve the softness of the optical cable, making it easier for the optical cable to pass through the air-blowing pipeline with a smaller bending radius, and can also increase the elasticity of the optical cable, so that the optical cable has better impact resistance. At a later stage, a reinforcement piece can be placed in the through hole to improve the tensile resistance of the optical cable. The friction coefficient between the outer sheath and the wall of the air-blowing pipeline in the present invention is smaller, so that the air-blowing optical cable can be laid faster.

[0020] Therefore, the present invention has the beneficial effects of simple structure, small optical cable friction coefficient, high air blowing efficiency, low cost, light weight, good softness, good impact resistance and the like. 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 This is a schematic diagram of the three-dimensional structure of the outer protective layer of Example 1 of the present invention.

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of Example 2 of the present invention.

[0024] Figure 4 This is a schematic diagram of the three-dimensional structure of Example 3 of the present invention.

[0025] Figure 5It is a schematic diagram of the three-dimensional structure of the outer protective layer of Example 2 or Example 3 of the present invention.

[0026] Figure 6 This is a cross-sectional view of the outer protective layer of Example 1 of the present invention.

[0027] Figure 7 It is a schematic diagram of the protrusion structure of Example 2 or Example 3 of the present invention.

[0028] In the figure: 1. outer sheath, 11. groove, 12. protrusion, 121. crest, 122. trough, 13. wind-shaking component, 14. vent, 15. through hole, 16. outer sheath body, 17. first magnet, 18. second magnet, 2. loose tube, 3. optical unit, 4. central reinforcement. DETAILED DESCRIPTION

[0029] Example 1

[0030] Please see Figure 1 , Figure 2 ,and Figure 6 , an air-blown microcable, comprising an outer sheath 1, at least three loose tubes 2 and a central reinforcement member 4, wherein the loose tube 2 is located around the central reinforcement member 4, the outer sheath 1 is extruded on the outer side of the loose tube 2, and at least one optical unit 3 is arranged in the loose tube 2, characterized in that the outer sheath is composed of an outer sheath body 16, a plurality of grooves 11 and protrusions 12 are formed at intervals along the circumference of the cable on the outer side of the outer sheath body 16, a through hole 15 is formed axially inside the outer sheath body 16 corresponding to each groove 11, a plurality of vents 14 are also formed on the outer sheath body 16 corresponding to each groove 11, and a ventilating component 13 is also arranged above each vent 14, The ventilating component 13 is in the shape of a "cat's ear", and the bottom edge is completely connected to the outer wall of the outer sheath body 16. The opening direction of the ventilating component 13 is along the groove 11, and the opening direction of all the ventilating components 13 is the same. The material of the ventilating component 13 is a flexible film. When the ventilating component 13 is closed, the ventilating component 13 covers the vent 14. When the ventilating component 13 is opened, the height of the ventilating component 13 is lower than the height of the plane formed by the tops of the two corresponding adjacent protrusions 12 and the plane of the groove 11 where the ventilating component 13 is located, so that when the optical cable is laid in the pipeline by air blowing, the ventilating component 13 will not touch the pipeline wall, thereby reducing the friction between the ventilating component 13 and the pipeline wall.

[0031] The air-blown microcable described above is characterized in that the central reinforcement member 4 is a phosphating steel wire or a stainless steel wire or a glass fiber rod.

[0032] Example 2

[0033] Please see Figure 3 , Figure 5 ,and Figure 7, an air-blown microcable, comprising an outer sheath 1, at least three loose tubes 2 and a central reinforcement member 4, wherein the loose tubes 2 are located around the central reinforcement member 4, the outer sheath 1 is extruded on the outer side of the loose tube 2, at least one optical unit 3 is arranged in the loose tube 2, and the outer sheath is composed of an outer sheath body 16, a plurality of grooves 11 and protrusions 12 are formed at intervals along the circumference of the cable on the outer side of the outer sheath body 16, a through hole 15 is formed axially inside the outer sheath body 16 corresponding to each groove 11, a plurality of vents 14 are also formed on the outer sheath body 16 corresponding to each groove 11, and a ventilation component 13 is also arranged above each vent 14, the ventilation component 13 is in a "cat ear shape", the bottom edge is all connected to the outer wall of the outer sheath body 16, the opening direction of the ventilation component 13 is along the groove 11, and the opening directions of all the ventilation components 13 are the same, the The material of the ventilating component 13 is a flexible film. When the ventilating component 13 is closed, the ventilating component 13 covers the vent 14. When the ventilating component 13 is opened, the height of the ventilating component 13 is lower than the height of the plane formed by the tops of the two corresponding adjacent protrusions 12 and the plane of the groove 11 where the ventilating component 13 is located, so that when the optical cable is laid in the pipeline by air blowing, the ventilating component 13 will not touch the pipeline wall, reducing the friction between the ventilating component 13 and the pipeline wall. A first magnet 17 is provided on the inner side of the top of the ventilating component 13, and a second magnet 18 corresponding to the first magnet 17 is provided on the groove 11, which can make the ventilating component 13 automatically close. The protrusion 12 forms a plurality of crests 121 and troughs 122 along the axial direction of the optical cable, and the height difference range of the crests 121 and the troughs 122 is [0.1mm, 0.3mm], further reducing the friction between the outer sheath 1 and the pipeline wall.

[0034] The air-blown microcable described above is characterized in that the central reinforcement member 4 is a phosphating steel wire or a stainless steel wire or a glass fiber rod.

[0035] Example 3

[0036] Please see Figure 4 , Figure 5 ,and Figure 7, an air-blown microcable, comprising an outer sheath 1 and a loose tube 2, the outer sheath 1 being extruded on the outside of the loose tube 2, at least one optical unit 3 being arranged in the loose tube 2, characterized in that the outer sheath is composed of an outer sheath body 16, a plurality of grooves 11 and protrusions 12 are formed at intervals along the circumference of the cable on the outside of the outer sheath body 16, a through hole 15 is formed axially inside the outer sheath body 16 corresponding to each groove 11, a plurality of vents 14 are also formed on the outer sheath body 16 corresponding to each groove 11, a ventilating component 13 is also arranged above each ventilating component 14, the ventilating component 13 is in a "cat ear shape", the bottom edges are all connected to the outer wall of the outer sheath body 16, the opening direction of the ventilating component 13 is along the groove 11, and the opening directions of all the ventilating components 13 are the same, the ventilating component 13 is made of a flexible film, When the ventilator component 13 is closed, the ventilator component 13 covers the vent 14. When the ventilator component 13 is opened, the height of the ventilator component 13 is lower than the height of the plane formed by the tops of the two corresponding adjacent protrusions 12 and the plane of the groove 11 where the ventilator component 13 is located, so that when the optical cable is laid in the pipeline by air blowing, the ventilator component 13 will not touch the pipeline wall, reducing the friction between the ventilator component 13 and the pipeline wall. A first magnet 17 is provided on the inner side of the top of the ventilator component 13, and a second magnet 18 corresponding to the first magnet 17 is provided on the groove 11, which can make the ventilator component 13 close automatically. The protrusion 12 forms a plurality of crests 121 and troughs 122 along the axial direction of the optical cable, and the height difference range of the crests 121 and troughs 122 is [0.1mm, 0.3mm], further reducing the friction between the outer sheath 1 and the pipeline wall.

[0037] An air-blown microcable as described in any of the above embodiments is characterized in that the suction force of the first magnet 17 and the second magnet 18 is smaller than the thrust of the airflow passing through the vent 14 on the air-shaking component 13 .

[0038] An air-blown microcable as described in any of the above embodiments is characterized in that the material of the optical unit 3 is optical fiber, and the type of the optical fiber is G.652, G.653, G.654, G.655 or G.656.

[0039] An air-blown microcable as described in any of the above embodiments is characterized in that the loose tube 2 is made of polybutylene terephthalate or modified polypropylene.

[0040] An air-blown microcable as described in any of the above embodiments is characterized in that a dry water-blocking method is adopted in the optical cable core.

[0041] In order to improve the efficiency of air-blown laying of optical cables, the experimenters obtained a new outer sheath material through experiments, which is measured by weight: polyethylene 100, graphite powder 0.1, ceramic powder 1.2, iron powder 1.0, talcum powder 0.08, polytetrafluoroethylene powder 0.8, polyvinyl chloride rubber 0.2, acrylonitrile-butadiene-styrene 0.06, antioxidant 0.9, glass fiber 0.8, asbestos 0.2, quartz 0.1, and silicate 0.4.

[0042] The testers customized 10 test samples, tested their friction coefficient relative to the silicone core tube material, and compared it with the friction coefficient of ordinary HDPE material relative to the silicone core tube material. The results are as follows:

[0043]

[0044] The friction coefficient of the above materials is more than 52% lower than that of ordinary plastics. When laid in ordinary air-blown pipes, the laying speed is faster than that of air-blown optical cables with ordinary polyethylene outer sheaths.

[0045] When in use, glue is used to seal one end of all the through holes 15 in the outer sheath 1 of the optical cable, and the end is passed through an air blowing device into the air blowing pipeline. The air blowing device is turned on, and the gas generated by the air blowing device not only flows along the surface of the outer sheath of the optical cable, but also enters the through hole 15, pushing the optical cable to be laid in the air blowing pipeline in the sheath. At the same time, the strong air pressure causes the gas to pass through the vent 14. When the vent component 13 above the vent 14 is blown up, the thrust of the gas on the optical cable is increased, thereby improving the laying efficiency.

[0046] The testers customized 5 samples of the structure of the present invention and compared them with ordinary samples:

[0047] Test conditions: room temperature, air compressor flow rate 10m³ / min, air blowing pipe inner diameter 33mm, 1MPa compressed air.

[0048] The sample parameters of the present invention are as follows: outer diameter 15 mm, number of samples 5, inner diameter of the vent 14 and the through hole 15 is 1 / 2 of the thickness of the outer sheath of the optical cable, and the area of ​​the vent component 13 is twice the area of ​​the through hole 15.

[0049] Comparison sample parameters: outer diameter 15mm, number of samples 5, number of comparison samples 5 (model GYFTY).

[0050] The test results are as follows:

[0051]

[0052] The average traction force applied to the optical cable is 1154N, and the average traction force applied to the optical cable is 692N. By comparison, under the same conditions, the traction force of the airflow on this product is 1.67 times that of the ordinary optical cable.

[0053] In the present invention, the through hole 15 increases the contact surface between the airflow and the optical cable, and improves the traction of the airflow on the optical cable. The more through holes there are, the greater the traction of the airflow on the optical cable. At the same time, the weight of the optical cable is reduced, the efficiency of the air-blowing laying of the optical cable is improved, the weight is also reduced, the transportation is convenient, and the cost is saved. The through hole 15 can also improve the softness of the optical cable, making it easier for the optical cable to pass through the air-blowing pipeline with a smaller bending radius, and can also increase the elasticity of the optical cable, so that the optical cable has better impact resistance. At a later stage, a reinforcement member can be placed in the through hole 15 to improve the tensile resistance of the optical cable.

[0054] The invention solves the problem of poor air blowing effect in the prior art.

[0055] 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 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. An air-blown microcable, comprising an outer sheath (1) and at least one loose tube (2). When the number of the loose tubes is one or two, the outer sheath (1) is extruded on the outer side of a cable core formed by one or two loose tubes (2). When the number of the loose tubes is greater than or equal to three, a central reinforcement member (4) is further provided between the cable cores formed by the three loose tubes (2), the loose tubes (2) are located around the central reinforcement member (4), and at least one optical unit (3) is provided in the loose tube (2), characterized in that: The outer sheath is composed of an outer sheath body (16), and a plurality of grooves (11) and protrusions (12) are formed at intervals along the circumference of the cable on the outer side of the outer sheath body (16), and a through hole (15) is formed axially inside the outer sheath body (16) corresponding to each groove (11), and a plurality of vents (14) are formed on the outer sheath body (16) corresponding to each groove (11), and a ventilation component (13) is provided above each vent (14), and the ventilation component (13) is in the shape of a cat's ear, and the bottom edge is completely connected to the cable. The outer wall of the outer protective layer body (16) is connected, the opening direction of the ventilating component (13) is along the groove (11), and the opening direction of all the ventilating components (13) is the same, the material of the ventilating component (13) is a flexible film, when the ventilating component (13) is closed, the ventilating component (13) covers the vent (14), when the ventilating component (13) is opened, the height of the ventilating component (13) is lower than the height of the plane formed by the tops of the two adjacent protrusions (12) and the plane of the groove (11) where the ventilating component (13) is located; The central reinforcement member (4) is a phosphated steel wire or a glass fiber rod; a first magnet (17) is provided on the inner side of the top of the ventilating component (13), and a second magnet (18) corresponding to the first magnet (17) is provided on the groove (11); the suction force of the first magnet (17) and the second magnet (18) is smaller than the thrust of the airflow passing through the vent (14) on the ventilating component (13); the protrusion (12) forms a plurality of wave crests (121) and wave troughs (122) along the axial direction of the optical cable; the height difference range of the wave crests (121) and the wave troughs (122) is [0.1 mm, 0.3 mm]; the material of the optical unit (3) is optical fiber.

2. An air-blown microcable according to claim 1, characterized in that: The model of the optical fiber is G.652, G.653, G.654, G.655 or G.

656.

3. An air-blown microcable according to claim 2, characterized in that: The material of the loose tube (2) is polybutylene terephthalate or modified polypropylene.

4. The air-blown microcable according to claim 3, characterized in that: The material of the outer protective layer body (16) has the following weight parts: polyethylene 100, graphite powder 0.1, ceramic powder 1.2, iron powder 1.0, talcum powder 0.08, polytetrafluoroethylene powder 0.8, polyvinyl chloride rubber 0.2, acrylonitrile-butadiene-styrene 0.06, antioxidant 0.9, glass fiber 0.8, asbestos 0.2, quartz 0.1, silicate 0.4.

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