Anti-pulling and anti-bending monitoring optical fiber

Abstract

The utility model discloses an anti-pulling and anti-bending monitoring optical fiber, which is characterized by comprising a bare optical fiber, a consolidation layer, an anti-pulling layer and a waterproof high-temperature-resistant jacket, the consolidation layer comprises a mechanical supporting layer, an anti-stretching structure, an insulating layer and a waterproof layer, and the anti-pulling layer comprises an anti-pulling layer, an anti-shock and anti-corrosion filling layer and an anti-compression layer; by adopting the monitoring optical fiber disclosed by the utility model, the pulling resistance, bending resistance and wear resistance of the optical fiber core can be improved, the refractive index of the bare optical fiber can be reduced, the interference can be reduced, and the transmission stability of optical signals can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of optical fibers, in particular to a monitoring optical fiber which is resistant to pulling and bending. Background Art

[0002] With the continuous development of optical fiber technology, optical fiber has been widely used in fields other than the telecommunications industry, such as military, electric power, engineering monitoring (sensing), petrochemical and medical fields. In particular, in some special fields, optical fiber has been increasingly valued and favored for its advantages such as large information transmission volume and strong anti-electromagnetic interference ability. In today's modern and information-based world, optical fiber has been needed by all walks of life. Generally, optical fiber is sheathed with PE plastic. These materials are conventional engineering materials with abundant sources, can meet large-scale production, and have relatively low costs. However, for some special industries such as tunnels, underground mines, reservoirs, and other industries that generate large pulling forces, optical fibers that can withstand high pulling forces are required, and ordinary optical fibers obviously cannot be used.

[0003] Distributed optical fiber is easily pulled during the laying process, which may cause the fiber core to break, resulting in the inability to transmit monitoring information, and the inability to enhance the monitoring positioning accuracy according to the laying method. Traditional optical fiber is not suitable for the laying technology and sensing technology based on distributed optical fiber sensing technology with optical fiber as the main body of the monitoring sensor. Therefore, although it can be monitored in the monitoring site, the monitoring information of the optical fiber will be affected by the pulling of the optical fiber core, and the outer skin of the optical fiber is relatively fragile and easily damaged by external physical damage, such as bending, squeezing, etc., resulting in signal transmission interruption or quality degradation. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art and to provide a monitoring optical fiber that is resistant to pulling and bending, thereby solving the problem that the distributed optical fiber is easily broken due to pulling during the laying process.

[0005] The purpose of the utility model is achieved through the following technical solutions:

[0006] A tear-resistant and bending-resistant monitoring optical fiber, comprising a bare optical fiber, a consolidation layer, an anti-tear layer and a waterproof and high-temperature resistant outer jacket, wherein the consolidation layer comprises a mechanical support layer, an anti-tensile structure, an insulating layer and a waterproof layer, and the anti-tear layer comprises an anti-tensile layer, an anti-seismic and anti-corrosion filling layer and an anti-compression layer;

[0007] The waterproof layer wraps the mechanical support layer, the mechanical support layer wraps the bare optical fiber, the insulating layer is arranged between the waterproof layer and the mechanical support layer, the anti-tensile structure is evenly distributed inside the insulating layer, the waterproof layer is wrapped in the anti-tensile layer, the waterproof and high-temperature resistant outer jacket wraps the anti-tensile layer, the anti-compression layer is arranged between the anti-tensile layer and the waterproof and high-temperature resistant outer jacket, there is an annular gap between the anti-tensile layer and the anti-compression layer, and the anti-seismic and anti-corrosion filling layer fills the annular gap.

[0008] The mechanical support layer is a cross inner wrapped frame, and the cross inner wrapped frame is made of nylon.

[0009] Preferably, the anti-stretching structure comprises a plurality of seamless tubes, and the plurality of seamless tubes are evenly distributed inside the insulating layer, and the pressure resistance of the anti-stretching structure is greater than 1.6 Mpa.

[0010] Preferably, the insulating layer is made of polyimide.

[0011] Preferably, the dielectric loss range of the insulating layer is 0.004-0.007 F / m.

[0012] Preferably, the waterproof layer is made of polyethylene.

[0013] Preferably, the tensile layer is a cylindrical carbon fiber woven mesh.

[0014] Preferably, the anti-seismic and anti-corrosion filling layer is low-VOC cable paste.

[0015] Preferably, the relative dielectric constant of the anti-seismic and anti-corrosion filling layer is ≤2.3§r.

[0016] Preferably, the pressure-resistant layer is a nylon woven mesh.

[0017] Preferably, the waterproof and high temperature resistant outer jacket is made of polyfluoride.

[0018] The utility model has the following advantages and beneficial effects compared with the prior art:

[0019] (1) The anti-pulling and anti-bending monitoring optical fiber disclosed in the utility model can improve the anti-pulling, anti-bending and wear resistance of the optical fiber core, and at the same time reduce the refractive index of the bare optical fiber, reduce interference, and improve the stability of optical signal transmission;

[0020] (2) The utility model wraps the bare optical fiber with a cross-wrapped skeleton (i.e., mechanical support layer) to provide mechanical support for the bare optical fiber. The external tensile strength structure of the cross-wrapped skeleton increases the tensile strength of the consolidation layer, allowing it to withstand greater tensile force. The use of polyimide to prepare the insulating layer prolongs the service life of the optical fiber in harsh environments. The use of polyethylene film as a waterproof layer can effectively prevent the optical fiber from being eroded by external environmental factors such as moisture and humidity, and is suitable for various complex working environments. The cylindrical carbon fiber braided mesh is used as the tensile layer to enhance the tensile strength and durability of the optical fiber and reduce external damage to the optical fiber. The low-VOC cable paste is filled between the tensile layer and the compressive layer to prevent the optical fiber from being eroded by moisture, The erosion of external environment such as moisture can extend the service life of the optical fiber. The pressure-resistant layer provides an additional protective layer, which increases the pressure resistance of the optical fiber and effectively prevents the optical fiber from being affected by external pressure. The combination of the three can keep the bare optical fiber intact under the huge tension caused by laying optical fiber in distributed optical fiber monitoring, and give it good mechanical protection and environmental protection effects, which can increase the service life and stability of the optical fiber; finally, polyfluoride is used as a waterproof and high-temperature resistant material. With its good properties of waterproof, moisture-proof, corrosion-resistant, high-temperature resistant and low friction coefficient, it can provide good protection and protection for the optical fiber, extend the service life of the optical fiber, improve its performance stability, and is suitable for optical fiber transmission applications in various harsh environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of a monitoring optical fiber that is resistant to pulling and bending according to the utility model;

[0022] Figure 2 It is a side view of a monitoring optical fiber that is resistant to pulling and bending according to the utility model;

[0023] Figure 3 It is a top view cross-sectional view of a monitoring optical fiber that is resistant to pulling and bending according to the utility model;

[0024] Figure 4 It is a schematic diagram of a monitoring optical fiber that is resistant to pulling and bending according to the utility model;

[0025] The markings of the components in the accompanying drawings:

[0026] 1-bare optical fiber, 2-consolidation layer, 21-mechanical support layer, 22-tensile structure, 23-insulation layer, 24-waterproof layer, 3-tear-resistant layer, 31-tensile layer, 32-seismic and anti-corrosion filling layer, 33-compression layer, 4-waterproof and high temperature resistant outer jacket; DETAILED DESCRIPTION

[0027] The purpose of the invention of the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments cannot be described one by one here, but the implementation methods of the utility model are not therefore limited to the following embodiments.

[0028] Embodiment 1

[0029] A tear-resistant and bending-resistant monitoring optical fiber, comprising a bare optical fiber 1, a consolidation layer 2, an anti-tear layer 3 and a waterproof and high-temperature resistant outer jacket 4, wherein the consolidation layer 2 comprises a mechanical support layer 21, an anti-tensile structure 22, an insulating layer 23 and a waterproof layer 24, and the anti-tear layer 3 comprises an anti-tensile layer 31, an anti-seismic and anti-corrosion filling layer 32 and an anti-compression layer 33;

[0030] The bare optical fiber 1 is wrapped inside the mechanical support layer 21. The mechanical support layer 21 is cross-shaped and is a cross-wrapped skeleton made of nylon material. The cross-wrapped skeleton provides mechanical support for the bare optical fiber 1. The mechanical support layer 21 is inside the center of the insulating layer 23.

[0031] The tensile-resistant structure 22 is four seamless tubes, which are respectively located at the upper left, upper right, lower left and lower right of the cross inner wrapped frame. The external tensile-resistant structure 22 of the cross inner wrapped frame (i.e., the mechanical support layer 21) improves the tensile strength of the consolidation layer 2, so that it can withstand greater tensile force;

[0032] The insulating layer 23 contains the tensile-resistant structure 22 and the mechanical support layer 21. The insulating layer 23 is made of polyimide, and its dielectric loss range includes 0.004-0.007F / m. Polyimide has high insulation performance, a dielectric constant of 4.0 at 103 Hz, and a dielectric loss of only 0.004-0.007, which belongs to F to H grade insulation, and can further protect the optical fiber and reduce the optical fiber loss. The tensile strength of polyimide is above 100MPa, which can improve the strength of the optical fiber. Polyimide has good dielectric properties, and the dielectric constant is about 3.4. The good chemical stability makes the service life of the optical fiber longer in harsh environments.

[0033] The outside of the insulating layer 23 is provided with a waterproof layer 24, a tensile layer 31, a shock-resistant and anti-corrosion filling layer 32, a compression layer 33 and a waterproof and high temperature resistant outer jacket 4 in sequence;

[0034] Using polyethylene film as the waterproof layer 24 can effectively prevent the optical fiber from being corroded by external environmental factors such as moisture and humidity, and is suitable for various complex working environments.

[0035] The tensile layer 31 is a cylindrical carbon fiber woven mesh. The carbon fiber woven mesh has high strength, which is 5 times stronger than steel, excellent heat resistance and can withstand high temperatures above 2000°C, excellent thermal shock resistance and small heat capacity, low thermal expansion coefficient and small deformation, and excellent corrosion resistance and radiation resistance. This makes the device have high mechanical strength and can adapt to different harsh environments. It enhances the tensile strength and durability of the optical fiber and reduces external damage to the optical fiber.

[0036] There is an annular gap between the tensile layer 31 and the compressive layer 33, and the anti-seismic and anti-corrosion filling layer 32 is filled in the annular gap. The anti-seismic and anti-corrosion filling layer 32 is a low-VOC cable paste, and the specific model is LTXL-low-VOC cable paste, which is a plastic paste, and its relative dielectric constant is ≤2.3§r. LTXL-low-VOC cable paste is a low-odor surface filling paste for cold-applied communication optical fiber and cable steel belt, aluminum belt, alloy belt and non-woven fabric. It can effectively and fully fill the gap to prevent water or other liquids from flowing into the cable or optical fiber to achieve the purpose of anti-seismic, anti-corrosion, insulation and moisture-proof. Corrosion and copper, aluminum, steel 80℃×336h and other performance indicators. This technical standard is non-corrosive, hydrogen evolution value ≤0.1v1 / g, relative dielectric constant ≤2.3§r, dielectric loss factor ≤1.0±0.001tg, which can further ensure the transmission stability of optical fiber. It not only prevents the optical fiber from being corroded by external environment such as water and moisture, but also prolongs the service life of the optical fiber.

[0037] The low VOC cable paste can not only fill the pores of the nylon braided mesh wrapped in the tubular carbon fiber braided mesh, but the combination of the polyimide insulation layer 23 and the low VOC cable paste can also improve the stability of the optical fiber in the ambient temperature range of -200 to 300°C.

[0038] The pressure-resistant layer 33 is a nylon woven mesh, which provides an additional protective layer, increases the pressure resistance of the optical fiber, and effectively prevents the optical fiber from being affected by external pressure. The combination of the three can keep the bare optical fiber 1 intact under the huge tension caused when laying the optical fiber in distributed optical fiber monitoring, and give it good mechanical protection and environmental protection effects, which can improve the service life and stability of the optical fiber.

[0039] Finally, the waterproof and high temperature resistant jacket 4 is used as the outermost layer, which has good properties of waterproof and moisture-proof, corrosion resistance, high temperature resistance, and low friction coefficient. It can provide good protection and protection for the optical fiber, extend the service life of the optical fiber, and improve its performance stability. It is suitable for optical fiber transmission applications in various harsh environments.

[0040] The above-mentioned specific implementation modes are preferred embodiments of the present invention and cannot be used to limit the present invention. Any other changes or other equivalent replacement methods that do not deviate from the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A monitoring optical fiber that is resistant to pulling and bending, characterized in that: The invention comprises a bare optical fiber (1), a consolidation layer (2), a tensile resistance layer (3) and a waterproof and high temperature resistant outer jacket (4), wherein the consolidation layer (2) comprises a mechanical support layer (21), an anti-tensile structure (22), an insulating layer (23) and a waterproof layer (24), and the tensile resistance layer (3) comprises an anti-tensile layer (31), an anti-vibration and anti-corrosion filling layer (32) and a pressure resistance layer (33); The waterproof layer (24) wraps the mechanical support layer (21), the mechanical support layer (21) wraps the bare optical fiber (1), the insulating layer (23) is arranged between the waterproof layer (24) and the mechanical support layer (21), the anti-tensile structure (22) is evenly distributed inside the insulating layer (23), the waterproof layer (24) is wrapped in the anti-tensile layer (31), the waterproof and high-temperature resistant outer jacket (4) wraps the anti-tensile layer (31), the anti-compression layer (33) is arranged between the anti-tensile layer (31) and the waterproof and high-temperature resistant outer jacket (4), an annular gap exists between the anti-tensile layer (31) and the anti-compression layer (33), and the anti-seismic and anti-corrosion filling layer (32) fills the annular gap; The mechanical support layer (21) is a cross-shaped inner-wrapped frame, and the cross-shaped inner-wrapped frame is made of nylon.

2. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The anti-stretching structure (22) comprises a plurality of seamless pipes, and the plurality of seamless pipes are evenly distributed inside the insulating layer (23). The anti-stretching structure (22) has a pressure resistance greater than 1.6 Mpa.

3. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The insulating layer (23) is made of polyimide.

4. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The dielectric loss of the insulating layer (23) is in the range of 0.004-0.007 F / m.

5. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The waterproof layer (24) is made of polyethylene.

6. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The tensile layer (31) is a cylindrical carbon fiber woven mesh.

7. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The anti-seismic and anti-corrosion filling layer (32) is low-VOC cable paste.

8. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The pressure-resistant layer (33) is a nylon woven mesh.

9. The tear-resistant and bending-resistant monitoring optical fiber according to claim 1, characterized in that: The waterproof and high temperature resistant outer jacket (4) is made of polyfluoride.

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