A compression and torsion-resistant ribbon optical cable

Abstract

The present invention belongs to the field of optical cables, and in particular, relates to a compression-resistant and torsion-resistant ribbon optical cable. It comprises: a sheath layer, an outer sheath, a middle sheath, an inner sheath, an axial core wire, and an outer spring wire and an inner spring wire; the sheath layer is coated on the outer surface of the outer sheath; the inner surface of the outer sheath is provided with a first thread groove adapted to the outer spring wire, and the outer spring wire is spirally inserted in the first thread groove; the inner surface of the inner sheath is provided with a second thread groove adapted to the inner spring wire, and the inner spring wire is spirally inserted in the second thread groove; a wire cavity is provided at the center of the inner sheath, and an axial core wire is loosely inserted in the wire cavity; an optical fiber ribbon is embedded in the axial core wire. Through the coordination of a specific multi-layer structure, the torsional force on the optical cable is blocked by the outer spring wire and the inner spring wire, and the torsional resistance is formed in coordination with the outer sheath and the inner sheath, so that the anti-twisting performance of the optical cable is significantly improved, and at the same time, it is also ensured that the optical cable has good structural stability and basic compressive resistance.

Description

Technical Field

[0001] The invention belongs to the field of optical cables, and in particular relates to a compression-resistant and torsion-resistant ribbon optical cable. Background Art

[0002] Ribbon optical cable, also known as ribbon cable, is an optical cable with a special structure.

[0003] The communication lines inside it are different from the bundled optical fibers in conventional optical cables. It uses optical fiber ribbons for signal transmission. Therefore, it has advantages that conventional optical cables do not have, such as multiple cores and easy splitting, but it also has the disadvantage of poor anti-twisting performance.

[0004] The most common form of damage to ribbon optical cables is damage caused by tearing of the internal optical fiber ribbon due to torsion. Therefore, improving the torsion resistance of ribbon optical cables is the key to improving their practicality and effectiveness. Summary of the invention

[0005] In order to solve the problems of the existing ribbon optical cables, such as weak anti-twisting performance and easy tearing of the optical fiber ribbon and damage to the optical fiber after twisting and torsion, the present invention provides a ribbon optical cable.

[0006] The objects of the present invention are:

[0007] 1. Improve the anti-twisting performance of ribbon optical cables;

[0008] 2. Ensure that the ribbon optical cable has good structural stability and certain compressive resistance.

[0009] To achieve the above objectives, the present invention adopts the following technical solutions.

[0010] A compression-resistant and torsion-resistant ribbon optical cable, comprising:

[0011] A sheath layer, an outer sheath, a middle sheath, an inner sheath, an axial line arranged in sequence from outside to inside, an outer spring line arranged between the outer sheath and the middle sheath, and an inner spring line arranged between the middle sheath and the inner sheath;

[0012] The sheath layer is coated on the outer surface of the outer sheath to protect the outer sheath;

[0013] The inner surface of the outer sheath is provided with a first thread groove adapted to the outer spring wire;

[0014] The pitch of the first thread groove is equal to the pitch of the outer spring wire, and the outer spring wire is spirally inserted into the first thread groove;

[0015] The inner surface of the inner sheath is provided with a second thread groove adapted to the inner spring wire;

[0016] The pitch of the second thread groove is equal to the pitch of the inner spring wire, and the inner spring wire is spirally inserted into the second thread groove;

[0017] The center of the inner sheath is provided with a wire cavity, and an axial wire is loosely inserted into the wire cavity;

[0018] An optical fiber ribbon is embedded in the axis line.

[0019] As a preference,

[0020] The depth of the first thread groove is greater than the outer thread diameter of the outer spring wire, so that the outer spring wire and the groove bottom of the first thread groove are separated.

[0021] As a preference,

[0022] The outer surface of the middle protective layer abuts outwardly against the inner surface of the outer protective layer.

[0023] As a preference,

[0024] The groove depth of the second thread groove is greater than the outer thread diameter of the inner spring wire, so that the inner spring wire is separated from the groove bottom of the second thread groove.

[0025] As a preference,

[0026] The outer surface of the inner sheath abuts against the inner surface of the middle sheath outwardly.

[0027] As a preference,

[0028] The spiral direction of the first thread groove and the outer spring wire is the same, but opposite to the spiral direction of the second thread groove and the inner spring wire.

[0029] As a preference,

[0030] The outer diameter of the axis is smaller than the inner diameter of the line cavity.

[0031] As a preference,

[0032] The difference between the outer diameter of the axis line and the inner diameter of the wire cavity is smaller than the difference between the outer diameter of the bottom of the first thread groove and the outer diameter of the outer spring wire, and is smaller than the difference between the outer diameter of the bottom of the second thread groove and the outer diameter of the inner spring wire.

[0033] As a preference,

[0034] The outer surface of the outer protective layer is provided with a first protective layer, and the outer surface of the middle protective layer is provided with a second protective layer.

[0035] As a preference,

[0036] The first protective layer and the second protective layer are both stainless steel braided wire protective layers.

[0037] The beneficial effects of the present invention are:

[0038] The present invention forms an effect of replacing torsional force with spring wires through the coordination of a specific multi-layer structure. The torsional force on the optical cable is effectively blocked by the outer spring wire and the inner spring wire, and cooperates with the outer sheath and the inner sheath to form a strong torsional resistance, so that the anti-twisting performance of the optical cable is significantly improved, and at the same time, it also ensures that the optical cable has good structural stability and basic compressive resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of the present invention;

[0040] Figure 2 It is a schematic diagram of the shaft side structure of the present invention;

[0041] Figure 3 It is a schematic diagram of a half-section structure of the structure between the outer sheath and the inner spring wire of the present invention;

[0042] Figure 4 It is a schematic diagram of the dynamic change trend of the structure between the outer sheath and the inner spring wire of the present invention under a condition of rotational torsion;

[0043] In the figure: 100 sheath layer, 200 outer protective layer, 201 first thread groove, 300 middle protective layer, 301 second thread groove, 400 inner protective layer, 401 line cavity, 500 axis core wire, 501 optical fiber ribbon, 600 outer spring wire, 700 inner spring wire, 800 first protective layer, 900 second protective layer. DETAILED DESCRIPTION

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Example

[0049] A kind of Figure 1 and Figure 2 The compression-resistant and torsion-resistant ribbon optical cable shown in the figure specifically comprises:

[0050] A sheath layer 100, an outer sheath layer 200, a middle sheath layer 300, an inner sheath layer 400, an axial core wire 500, an outer spring wire 600 disposed between the outer sheath layer 200 and the middle sheath layer 300, and an inner spring wire 700 disposed between the middle sheath layer 300 and the inner sheath layer 400;

[0051] The sheath layer 100 is coated on the outer surface of the outer sheath layer 200 to protect the outer sheath layer 200;

[0052] The inner surface of the outer sheath 200 is provided with a first thread groove 201 adapted to the outer spring wire 600;

[0053] The pitch of the first thread groove 201 is equal to the pitch of the outer spring wire 600. The outer spring wire 600 is spirally inserted into the first thread groove 201. The depth of the first thread groove 201 is greater than the outer thread diameter of the outer spring wire 600, so that the outer spring wire 600 is separated from the bottom of the first thread groove 201.

[0054] The inner surface of the middle sheath 300 is provided with a second thread groove 301 adapted to the inner spring wire 700, and the outer surface abuts against the inner surface of the outer sheath 200 outwardly. The outer surface of the middle sheath 300 abuts against the inner surface of the outer sheath 200 in such a manner that the outer spring wire 600 is effectively confined in the first thread groove 201;

[0055] The thread pitch of the second thread groove 301 is equal to the thread pitch of the inner spring wire 700, the inner spring wire 700 is spirally inserted into the second thread groove 301, and the groove depth of the second thread groove 301 is greater than the outer thread diameter of the inner spring wire 700, so that the inner spring wire 700 is separated from the groove bottom of the second thread groove 301;

[0056] The outer surface of the inner protective layer 400 abuts against the inner surface of the middle protective layer 300 outwardly, so that the inner spring wire 700 is confined in the second thread groove 301;

[0057] The first thread groove 201 and the outer spring wire 600 have the same thread direction, but are opposite to the thread direction of the second thread groove 301 and the inner spring wire 700;

[0058] The inner protective layer 400 has a wire cavity 401 at its center, and an axial line 500 is loosely installed in the wire cavity 401, and the outer diameter of the axial line 500 is smaller than the inner diameter of the wire cavity 401;

[0059] The difference between the outer diameter of the shaft center line 500 and the inner diameter of the wire cavity 401 is smaller than the difference between the outer diameter of the bottom of the first thread groove 201 and the outer diameter of the outer spring wire 600, and smaller than the difference between the outer diameter of the bottom of the second thread groove 301 and the outer diameter of the inner spring wire 700, so as to ensure that when the optical cable is compressed to the point where the bottom of the first thread groove 201 is in contact with the outer spring wire 600 and / or the bottom of the second thread groove 301 is in contact with the inner spring wire 700, the inner sheath 400 will not produce an extrusion effect on the shaft center line 500;

[0060] The axial line 500 has an optical fiber ribbon 501 embedded therein.

[0061] In such Figure 3 With the cooperation of the structure shown in the figure, the compression-resistant and torsion-resistant ribbon optical cable of the present invention first has a very excellent compression-resistant buffering effect. Due to the cooperation of the first thread groove 201 and the outer spring wire 600, the second thread groove 301 and the inner spring wire 700, and the depth control of the first thread groove 201 and the second thread groove 301, when the optical cable of the present invention is subjected to radial force, the sheath layer 100 drives the outer sheath to shrink and extrude on the outer spring wire 600 and the middle sheath 300, and the middle sheath 300 drives the inner sheath 400 to shrink and extrude inwards until the first thread groove 201 When the groove bottom contacts the outer spring wire 600 and / or the groove bottom of the second thread groove 301 contacts the inner spring wire 700, the outer spring wire 600 and / or the inner spring wire 700 form an effective anti-compression effect. The spring wire is made of elastic metal, and due to its thread structure, it has a strong ability to resist radial extrusion, and can form a great buffering and offsetting effect on external forces. At the same time, the inner wall of the wire cavity 401 of the inner sheath 400 has not yet exerted an extrusion effect on the shaft core wire 500, and the shaft core wire 500 and the optical fiber ribbon 501 inside it will not be directly subjected to force, forming excellent anti-compression protection;

[0062] On the other hand, the optical cable of the present invention has a more excellent buffering and offsetting effect on the twisting effect that easily causes damage to the optical fiber ribbon 501 in the ribbon optical cable;

[0063] Specifically,

[0064] When the sheath layer 100 is subjected to the torsion effect and drives the outer sheath 200 and the middle sheath 300 to twist, if the torsion direction is opposite to the spiral direction of the outer spring wire 600, due to the close contact between the outer wall of the middle sheath 300 and the outer spring wire 600, the outer diameter of the outer spring wire 600 will also be increased, and the expansion process will cause the spiral pitch of the spring wire to change, thereby making the friction between the outer spring wire 600 and the groove wall of the first thread groove 201 stronger, and the first thread groove 201 drives the outer spring wire 600 to twist, and the increase in the spiral diameter of the outer spring wire 600 will also slightly drive the expansion of the outer sheath 200, so that the torsion effect will be significantly weakened when it is transmitted to the middle sheath 300, until the outer spiral diameter of the outer spring wire 600 expands and abuts against the bottom of the first thread groove 201. At this time, since the outer spring wire 600 can no longer be stretched out and is restricted by the outer sheath 200 and the first thread groove 201, it will generate huge torsional resistance, forming a nearly rigid anti-torsion effect;

[0065] like Figure 4 As shown, if the twisting direction is the same as the spiral direction of the outer spring wire 600, the inner sheath 400 will be twisted by the middle sheath 300. Due to the close contact between the outer wall of the inner sheath 400 and the inner spring wire 700, the spiral diameter of the inner spring wire 700 is increased. As the above principle, during the expansion process, the inner thread wire is twisted by the groove wall of the second thread groove 301 through static friction. The expansion process will also cause the middle sheath 300 and the inner sheath 400 to separate slightly, so that the torsion conduction is weakened, until the inner spring wire 700 abuts against the groove bottom of the second thread groove 301 outwardly. Since the inner spring wire 700 can no longer expand outward, it generates huge torsional resistance, forming a rigid anti-torsion effect.

[0066] Therefore, the optical cable of the present invention has a very excellent anti-torsion effect for bidirectional torsion, can avoid the torsion effect on the axis 500, and produce an excellent anti-torsion protection effect for the optical fiber ribbon 501 in the axis 500.

[0067] Furthermore,

[0068] The outer surface of the outer protective layer 200 is provided with a first protective layer 800, and the outer surface of the middle protective layer 300 is provided with a second protective layer 900;

[0069] The first protective layer 800 and the second protective layer 900 are both stainless steel braided wire protective layers;

[0070] The first protective layer 800 and the second protective layer 900 are provided to improve the structural strength of the outer protective layer 200 and the middle protective layer 300. Since both the outer spring wire 600 and the inner spring wire 700 are likely to expand, the outer protective layer 200 and / or the inner protective layer 400 are prone to bursting when simply prepared using conventional materials such as PE. After the first protective layer 800 and the second protective layer 900 composed of stainless steel braided wires respectively cover the outer protective layer 200 and the inner protective layer 400 for protection, the problem of bursting of the outer protective layer 200 and / or the inner protective layer 400 can be avoided, and the anti-twisting effect of the overall cable is further strengthened and improved.

Claims

1. A compression and torsion resistant ribbon optical cable, characterized in that: include: A sheath layer, an outer sheath, a middle sheath, an inner sheath, an axial line arranged in sequence from outside to inside, an outer spring line arranged between the outer sheath and the middle sheath, and an inner spring line arranged between the middle sheath and the inner sheath; The sheath layer is coated on the outer surface of the outer sheath; The inner surface of the outer sheath is provided with a first thread groove adapted to the outer spring wire; The pitch of the first thread groove is equal to the pitch of the outer spring wire, and the outer spring wire is spirally inserted into the first thread groove; The inner surface of the inner sheath is provided with a second thread groove adapted to the inner spring wire; The pitch of the second thread groove is equal to the pitch of the inner spring wire, and the inner spring wire is spirally inserted into the second thread groove; The center of the inner sheath is provided with a wire cavity, and an axial wire is loosely inserted into the wire cavity; An optical fiber ribbon is embedded in the axis line; The outer diameter of the axis is smaller than the inner diameter of the line cavity; The difference between the outer diameter of the axis line and the inner diameter of the wire cavity is smaller than the difference between the outer diameter of the bottom of the first thread groove and the outer diameter of the outer spring wire, and is smaller than the difference between the outer diameter of the bottom of the second thread groove and the outer diameter of the inner spring wire.

2. The compression-resistant and torsion-resistant ribbon optical cable according to claim 1, characterized in that: The depth of the first thread groove is greater than the outer thread diameter of the outer spring wire, so that the outer spring wire and the groove bottom of the first thread groove are separated.

3. A compression-resistant and torsion-resistant ribbon optical cable according to claim 1 or 2, characterized in that: The outer surface of the middle protective layer abuts outwardly against the inner surface of the outer protective layer.

4. The compression-resistant and torsion-resistant ribbon optical cable according to claim 1, characterized in that: The groove depth of the second thread groove is greater than the outer thread diameter of the inner spring wire, so that the inner spring wire is separated from the groove bottom of the second thread groove.

5. A compression-resistant and torsion-resistant ribbon optical cable according to claim 1 or 4, characterized in that: The outer surface of the inner sheath abuts against the inner surface of the middle sheath outwardly.

6. The compression-resistant and torsion-resistant ribbon optical cable according to claim 1, characterized in that: The spiral direction of the first thread groove and the outer spring wire is the same, but opposite to the spiral direction of the second thread groove and the inner spring wire.

7. The compression-resistant and torsion-resistant ribbon optical cable according to claim 1, characterized in that: The outer surface of the outer protective layer is provided with a first protective layer, and the outer surface of the middle protective layer is provided with a second protective layer.

8. The compression-resistant and torsion-resistant ribbon optical cable according to claim 7, characterized in that: The first protective layer and the second protective layer are both stainless steel braided wire protective layers.

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