Anti-static pressure optical cable

Abstract

The invention belongs to the field of optical cables, and particularly relates to an anti-static-pressure optical cable. The cable comprises a sheath layer, a compression-resistant hardened layer and a core wire which are sequentially arranged from outside to inside, the core wire is arranged in the sheath layer and the compression-resistant structure layer and at the axis of the optical cable; the compression-resistant hardened layer is composed of a plurality of strip-shaped matching single bodies in the axial direction of the optical cable, the matching single bodies are evenly and circumferentially arranged on the outer side of the core wire around the core wire, and the matching single bodies are in a shape similar to a Chinese character'tu 'on the radial section of the optical cable. The matching single body is provided with an end protrusion and a bottom matching groove which are matched with each other. According to the optical cable, through an internal compressible structure, after the optical cable is subjected to static pressure, cooperative structure circumferential hardening can be formed, a built-in shell layer structure is formed through circumferential hardening to resist the external static pressure, the static pressure resisting effect is achieved, meanwhile, a large internal space is reserved, and it can be ensured that the optical cable can keep the high core number.

Description

Technical Field

[0001] The invention belongs to the field of optical cables, and in particular relates to an anti-static pressure optical cable. Background Art

[0002] Optical cable is a common and frequently used communication cable, which is used to transmit optical signals to realize its communication function.

[0003] With the popularization of optical cables, the laying methods of optical cables are becoming more and more diverse. At present, underwater laying and underground burying of optical cables are becoming more and more common, becoming one of the conventional laying methods of optical cables. However, optical cables do not have the same good pressure resistance as electrical cables, and they are very prone to pressure loss when subjected to strong circumferential static pressure.

[0004] To this end, the common method is to install a rigid pipe outside the optical cable to protect it. However, the installation of the pipe will greatly prolong the cable laying period and increase the cable laying cost. The pipe also limits the cable diameter. Some protective structures also make the internal structure of the cable more compact, reducing the number of cores that can be accommodated. Summary of the invention

[0005] In order to solve the problems that existing optical cables generally do not have good resistance to circumferential static pressure, are easily damaged when laid underwater or buried underground, and the existing armored reinforcement structure limits the internal space and causes a decrease in the number of optical cable cores, the present invention provides a static pressure resistant optical cable.

[0006] The main purpose of the present invention is: 1. It can effectively improve the anti-static pressure capability of optical cables; 2. Ensure that there is enough space inside the optical cable to accommodate the core wires.

[0007] To achieve the above objectives, the present invention adopts the following technical solutions.

[0008] An anti-static pressure optical cable, comprising: The sheath layer, the compression hardening layer and the core wire are arranged in sequence from the outside to the inside; The core wire is arranged inside the sheath layer and the compression-resistant structural layer and at the axis of the optical cable; The compression hardening layer is composed of a plurality of strip-shaped matching monomers along the axial direction of the optical cable, the matching monomers are evenly arranged circumferentially around the core wire on the outside of the core wire, and the matching monomers are in a convex shape on the radial cross section of the optical cable; The matching monomer is provided with an end protrusion and a bottom matching groove which match each other.

[0009] As a preference, All the matching monomers of the compression hardening layer are provided with end protrusions in the same circumferential direction, and bottom matching grooves are provided on the opposite circumferential sides.

[0010] As a preference, The end protrusion of the matching monomer extends into the matching groove at the bottom of the adjacent matching monomer.

[0011] As a preference, An elastic rubber strip is also inserted into the bottom matching groove of the matching monomer.

[0012] As a preference, The combined unit is also provided with an inner groove arranged along the axial direction of the optical cable.

[0013] As a preference, The inner wall on the radial inner side of the inner groove is a straight wall or its curvature is greater than the inner wall on the radial outer side of the inner groove, and an elastic strip is provided in the inner groove to fit the inner wall on the radial outer side of the inner groove.

[0014] As a preference, The core line is composed of a single optical fiber line or optical fiber bundle wrapped by a bundle tube, which serves as the main functional line for transmitting optical signals. The beneficial effects of the present invention are: The optical cable of the present invention realizes the formation of a matching structural circumferential hardening after being subjected to static pressure through an internal compressible structure. The circumferential hardening forms a built-in "shell" structure to resist the external static pressure, thereby achieving an anti-static pressure effect. At the same time, a large internal space is retained to ensure that the optical cable can maintain a high core number. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the optical cable of the present invention; Figure 2 It is a schematic diagram of the optical cable of the present invention after being compressed; Figure 3 for Figure 2 A partial enlarged schematic diagram of part A; In the figure: 100 sheath layer, 200 compression hardening layer, 201 matching monomer, 2011 end protrusion, 2012 bottom matching groove, 2013 inner groove, 2014 elastic strip, 202 elastic rubber strip, 300 core wire. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with specific embodiments and the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. In addition, the embodiments of the present invention involved in the following description are generally only embodiments of a part of the present invention, rather than all embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without making creative work should fall within the scope of protection of the present invention.

[0017] In the description of the present invention, it should be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined, and "several" means one or more.

[0018] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0019] Unless otherwise specified, the raw materials used in the examples of the present invention are all commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the examples of the present invention are all methods known to those skilled in the art.

[0020] Example A kind of Figure 1 The anti-static pressure optical cable shown in the figure specifically comprises: The sheath layer 100, the compression hardening layer 200 and the core wire 300 are arranged in sequence from the outside to the inside; The core wire 300 is arranged inside the sheath layer 100 and the compression-resistant structural layer and at the axis of the optical cable, and is composed of a bundle tube covering a single optical fiber or an optical fiber bundle, and serves as the main functional line for transmitting optical signals; The compression hardening layer 200 is composed of a plurality of strip-shaped matching monomers 201 along the axial direction of the optical cable. The matching monomers 201 are made of elastic material and are evenly arranged circumferentially around the core wire 300 on the outside of the core wire 300. The matching monomers 201 are shaped like a convex letter on the radial cross section of the optical cable. All matching monomers 201 are provided with end protrusions 2011 on the same circumferential side, and correspondingly, are provided with bottom matching grooves 2012 matching with the end protrusions on the opposite circumferential side. When the matching monomers 201 are arranged, the end protrusions 2011 of the matching monomers 201 only partially extend into the bottom matching grooves 2012 of the adjacent matching monomers 201, and the end protrusions 2011 of the matching monomers 201 should be prevented from abutting against the bottom of the bottom matching grooves 2012 of the adjacent matching monomers 201; Through the above-mentioned structural coordination, the present invention can keep the internal space of the optical cable large enough to accommodate a large number of cores 300, and at the same time can make the optical cable have a certain ability to resist circumferential static pressure. Of course, the ability of the anti-static optical cable of the present invention to resist circumferential static pressure depends on the thickness of the anti-compression hardening layer 200; When the optical cable of the present invention is subjected to circumferential static pressure, Figure 2 and Figure 3 The outer side of the sheath layer 100 shown in the figure is uniformly subjected to radial inward force, so that the sheath layer 100 is compressed and the outer diameter is reduced, and at the same time, the compression hardening layer 200 is driven to shrink and the thickness is reduced. Due to the structural characteristics of the matching monomer 201, when it is subjected to radial compression, the circumferential length of the end protrusion 2011 of the matching monomer 201 and the circumferential depth of the bottom matching groove 2012 of the matching monomer 201 will increase, so that the end protrusion 2011 of the matching monomer 201 and the bottom matching groove 2012 of the matching monomer 201 will form abutment, forming a complete and dense annular structure; After the structure is formed, when the anti-static pressure optical cable is still subjected to the external circumferential static pressure, if the external circumferential static pressure is large enough, the matching monomer 201 will continue to be radially compressed, so that the matching monomer 201 generates a greater extrusion force through the dense annular structure formed by the mutually matched end protrusions 2011 and the bottom matching grooves 2012, thereby forming internal stress hardening, so that the optical cable of the present invention has a good ability to resist circumferential static pressure; In the above process, the matching monomer 201 forms radial compression and circumferential expansion, and the material itself forms elastic deformation and accumulates internal stress. As the deformation amplitude gradually increases, the internal stress also gradually increases to form the compression hardening of the material itself, and then it can be regarded as a hardened strip riveted structure to form a hardened splicing structure, thereby maintaining the flexibility of the original optical cable while enabling it to have the ability to quickly shrink and harden after being subjected to circumferential static pressure, so that the optical cable has good resistance to circumferential static pressure.

[0021] Furthermore, The bottom matching groove 2012 of the matching monomer 201 of the present invention is also provided with an elastic rubber strip 202; The elastic rubber strip 202 will further improve the circumferential hardening effect formed by the cooperation between the matching monomers 201 when the optical cable is subjected to uniform circumferential static pressure, because the structural gap between the bottom matching groove 2012 and the end protrusion 2011 between the matching monomers 201 is reduced, and when the matching monomers 201 are circumferentially expanded, the response efficiency of the circumferential hardening will be improved, and a greater circumferential extrusion force will be generated, forming a greater internal stress, resulting in a better hardening effect.

[0022] Furthermore, The matching monomer 201 of the present invention is also provided with an inner groove 2013 arranged along the axial direction of the optical cable; The inner wall of the inner groove 2013 on the radial inner side is a straight wall or its curvature is greater than the inner wall of the inner groove 2013 on the radial outer side. Meanwhile, an elastic strip 2014 is provided in the inner groove 2013 to fit the inner wall of the inner groove 2013 on the radial outer side. The cooperation between the inner groove 2013 and the elastic strip 2014 will cause the bottom matching groove 2012 and the end protrusion 2011 of the matching monomer 201 to cooperate to form circumferential internal stress when the optical cable is subjected to circumferential static pressure and the matching monomer 201 is subjected to radial compression. Since the matching monomer 201 is also subjected to radial compression, the elastic strip 2014 arranged in the inner groove 2013 will actually also be subjected to force to make it tend to fit the inner wall of the radial inner side of the inner groove 2013, forming a quasi-circumferential expansion effect, thereby further increasing the circumferential extrusion force and producing a more significant internal stress hardening effect.

Claims

1. A static pressure resistant optical cable, characterized in that: include: The sheath layer, the compression hardening layer and the core wire are arranged in sequence from the outside to the inside; The core wire is arranged inside the sheath layer and the compression-resistant structural layer and at the axis of the optical cable; The compression hardening layer is composed of a plurality of strip-shaped matching monomers along the axial direction of the optical cable, the matching monomers are evenly arranged circumferentially around the core wire on the outside of the core wire, and the matching monomers are in a convex shape on the radial cross section of the optical cable; The matching monomer is provided with an end protrusion and a bottom matching groove which match each other.

2. The static pressure resistant optical cable according to claim 1, characterized in that: All the matching monomers of the compression hardening layer are provided with end protrusions in the same circumferential direction, and bottom matching grooves are provided on the opposite circumferential sides.

3. The static pressure resistant optical cable according to claim 1 or 2, characterized in that: The end protrusion of the matching monomer extends into the matching groove at the bottom of the adjacent matching monomer.

4. The static pressure resistant optical cable according to claim 1, characterized in that: An elastic rubber strip is also inserted into the bottom matching groove of the matching monomer.

5. The static pressure resistant optical cable according to claim 1, characterized in that: The combined unit is also provided with an inner groove arranged along the axial direction of the optical cable.

6. The static pressure resistant optical cable according to claim 5, characterized in that: The inner wall on the radial inner side of the inner groove is a straight wall or its curvature is greater than the inner wall on the radial outer side of the inner groove, and an elastic strip is provided in the inner groove to fit the inner wall on the radial outer side of the inner groove.

7. The static pressure resistant optical cable according to claim 1, characterized in that: The core line is composed of a single optical fiber line or an optical fiber bundle wrapped by a bundle tube, and serves as a main functional line for transmitting optical signals.

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