CN113359257B - Pressure-resistant optical cable - Google Patents

Abstract

The invention belongs to the field of communication cables, in particular to a compression-resistant optical cable. It includes: an inner core wire and a sheath layer sheathed outside the inner core wire; the outer surface of the inner core wire and the inner surface of the sheath layer are not in contact with each other, and the two are separated from each other to form an annular cavity; In the jacket layer, around the axis of the optical cable, there are evenly embedded a number of separate and J-like cross-section force-guiding skeleton pieces. , the block is a semi-circular arc, which is embedded in the sheath layer, and one end extends from the inner surface of the sheath layer into the annular cavity, and the force-guiding segment fits the outer surface of the inner core wire and the sheath in the annular cavity. The inner surface of the jacket layer is provided, and one end thereof is connected with the block. The compression-resistant optical cable of the present invention has good compression-resistant performance; through structural improvement, the guide force form and direction inside the optical cable are changed, and the optical fiber inside the optical cable is effectively prevented from being subjected to strong radial force.

Description

Compression cable

technical field

The invention belongs to the field of communication cables, in particular to a compression-resistant optical cable.

Background technique

Fiber optic cables are manufactured to meet optical, mechanical, or environmental performance specifications, and are telecommunication cable assemblies that utilize one or more optical fibers in a sheathing as the transmission medium and can be used individually or in groups.

At present, for optical cables, the compressive performance is a very important performance, and it is usually regarded as the most important performance index besides the transmission performance of optical cables. However, most optical cables do not have very good compression resistance, and are easily damaged or damaged when subjected to external pressure.

At present, most of the ways to improve the compression resistance of optical cables are to coat the optical fibers with multiple layers of rigid or relatively rigid structural layers to prevent the optical fibers from being damaged by pressure. However, this structure will greatly increase the specific gravity of the optical cable, which is not conducive to the overhead installation of the optical cable. At the same time, this type of reinforcing structure is still a fully dense structure. When the optical cable is subjected to external force, the external force is still prone to radial conduction, which acts on the optical fiber line internally, causing damage to the optical cable.

SUMMARY OF THE INVENTION

In order to solve the general poor mechanical properties of the existing optical cables, the current improvement method adopts a layered structure. Although the compressive performance of the optical cable can be effectively improved, the actual optical cable is still easy to conduct force transmission along the radial direction of the optical cable after being stressed. , resulting in cable damage and other problems. The invention provides a compression-resistant optical cable.

The purpose of this invention is to:

1. Improve the compressive performance of the overall optical cable;

2. Changes in the form and direction of the guiding force are realized through structural improvement, which hinders the radial guiding force of the optical cable.

In order to achieve the above objects, the present invention adopts the following technical solutions.

A compression-resistant optical cable, comprising:

The inner core wire and the sheath layer sleeved outside the inner core wire;

The outer surface of the inner core wire and the inner surface of the sheath layer are not in contact with each other, and the two are separated from each other to form an annular cavity;

The jacket layer is evenly embedded with a number of separate and J-shaped cross-section force-guiding skeleton members around the axis of the optical cable. On the cross section, the block is a semi-circular arc, which is embedded in the sheath layer and one end extends from the inner surface of the sheath layer into the annular cavity, and the force-guiding segment fits the outer surface of the inner core wire and the inner core wire in the annular cavity. The inner surface of the sheath layer is provided with one end connected to the block.

As a preference,

The fan-shaped angle of the force-guiding skeleton on the radial section of the optical cable is α, and the number of the force-guiding skeletons is x, α=360/x±5°.

As a preference,

The outer surface of the inner core wire is provided with a rubber layer.

As a preference,

The rubber used in the rubber layer is damping rubber.

As a preference,

The sheath layer is also provided with an arc-shaped force-guiding member that protrudes outwards;

The arc-shaped force-guiding members are uniformly arranged between the blocks of the force-guiding frame members along the circumferential direction of the optical cable, and the number of the force-guiding frame members is equal to that of the force-guiding frame members.

As a preference,

Both the arc-shaped force-guiding member and the force-guiding frame member are prepared from elastic materials reinforced by glass microbeads.

As a preference,

The raw materials for the preparation of the elastic material include glass microbeads, polyurethane and vermiculite powder.

As a preference,

The vermiculite powder accounts for 5-15wt% of the total mass of the polyurethane and the vermiculite powder.

As a preference,

The glass microbeads are hollow borosilicate glass microbeads, the particle diameter of the hollow borosilicate glass microbeads is 220-350 μm, and the wall thickness is 5-20 μm.

As a preference,

The elastic material is prepared by the following method:

The vermiculite powder is added to the polyurethane, and after kneading and granulation, the obtained granules are loosely mixed with glass microbeads, and the secondary mixing is performed to obtain an elastic material reinforced by the glass microbeads.

The beneficial effects of the present invention are:

1) It can ensure that the optical cable has good compression performance;

2) Through the structural improvement, the form and direction of the guiding force inside the optical cable are changed, which effectively avoids the strong radial force on the optical fiber inside the optical cable;

3) The anti-twist performance of the optical cable can be improved to a certain extent.

Description of drawings:

Fig. 1 is the structural representation of the present invention;

Fig. 2 is a kind of force analysis diagram of the present invention;

Fig. 3 is another kind of force analysis diagram of the present invention;

In the picture: 100 inner core wire, 101 optical fiber cable, 102 bundled tube, 103 heat insulation layer, 104 rubber layer, 200 sheath layer, 201 anti-aging layer, 300 force-conducting skeleton, 301 block, 302 force-conducting section, 400 arc force guide, 500 annular cavity.

Detailed ways:

The present invention will be further described and described in detail below with reference to specific embodiments and accompanying drawings. Those 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 referred to in the following description are generally only some embodiments of the present invention, not all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "thickness", "upper", "lower", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined, the meaning of "several" means one or more.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between the two components, unless otherwise expressly qualified. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Unless otherwise specified, the raw materials used in the embodiments of the present invention are commercially available or available to those skilled in the art; unless otherwise specified, the methods used in the embodiments of the present invention are all methods mastered by those skilled in the art.

Example

A compression-resistant optical cable as shown in Figure 1, which specifically includes:

The inner core wire 100 arranged from the inside to the outside and the sheath layer 200 sleeved outside the inner core wire 100;

The outer surface of the sheath layer 200 is provided with an anti-aging layer 201;

The inner core wire 100 is provided with an optical fiber wire 101 along the axial direction of the optical cable, and the optical fiber wire 101 is a single-mode optical fiber or a multi-mode optical fiber or an optical fiber bundle;

The optical fiber cable 101 is provided with a bundle tube 102, the bundle tube 102 is covered with a thermal insulation layer 103, and the thermal insulation layer 103 is covered with a rubber layer 104;

The outer surface of the inner core wire 100 and the inner surface of the sheath layer 200 are not in contact with each other, and the two are separated from each other to form an annular cavity 500;

The jacket layer 200 is evenly embedded with a number of separate force-guiding frame members 300 with a J-shaped cross-section around the axis of the optical cable. On the radial section of the optical cable, the block 301 is a semi-circular arc, which is embedded in the sheath layer 200 and one end extends from the inner surface of the sheath layer 200 into the annular cavity 500. The cavity 500 is disposed in contact with the outer surface of the inner core wire 100 and the inner surface of the sheath layer 200, and one end of the cavity 500 is connected to the block 301;

The force-guiding frame member 300 is made of elastic material, and its sector angle on the radial cross-section of the optical cable is α, and the number of the force-guiding frame members 300 is x, α=360/x±5°;

After setting the sector angle of the force-guiding frame member 300 on the radial section of the optical cable,

In this embodiment, the number of the force-guiding frame members 300 is 3, and the fan-shaped angle of the force-guiding frame members 300 on the radial section of the optical cable is 115°.

Under the cooperation of the above structure, as shown in Figure 2:

When the optical cable is subjected to the external force F1 in the direction of the block 301 of the force-conducting framework 300, the block 301 of the force-conducting framework 300 will be compressed and compressed in the radial direction of the optical cable. In the annular cavity 500, the force-guiding frame members 300 are separated from each other, and the actual annular cavity 500 has a movable gap, so that the force-guiding segment 302 can move along the circumferential direction of the optical cable under the constraint of the annular cavity 500. Therefore, when the block 301 is deformed, it will Pushing the movement of the force-conducting section 302 makes the external force F1 actually conduct in the direction a of the block 301 and in the direction b in the force-conducting section 302, which directly reduces the force transmission in the radial direction of the optical cable, and buffers the external force by means of displacement. F1, thereby producing a good compression protection effect on the inner core wire 100 of the optical cable;

At the same time, the optical cable of this structure is not provided with a rigid reinforcement structure, which can greatly improve the flexibility of the optical cable, and can effectively solve the problems of high specific gravity, difficult bending and high density of the conventional compression-resistant optical cable such as GYTA and GYTS layered stranded optical cables. Inconvenient transportation and other issues.

further,

The rubber used in the outermost rubber layer 104 of the inner core wire 100 is damping rubber;

Since the structure of the force-conducting frame member 300 of the present invention realizes compression resistance and buffering by means of displacement, the rubber layer 104 has good wear resistance and is not easy to wear. The force-conducting section 302 of 300 will be damped by the rubber layer 104 during the displacement process, which increases the friction between the force-conducting section 302 and the rubber layer 104, and can further buffer and offset the external force through friction, so it can be better To achieve the effect of compression and cushioning.

further,

The sheath layer 200 is further provided with an arc-shaped force-guiding member 400 that protrudes outwards;

The arc-shaped force-guiding members 400 are evenly arranged between the blocks 301 of the force-guiding frame members 300 along the circumference of the optical cable, and the number of the arc-shaped force-guiding members 400 is equal to that of the force-guiding frame members 300;

The arc-shaped force-guiding member 400 is made of the same elastic material as the force-guiding frame member 300;

The elastic material is a glass microbead reinforced elastic material, and its preparation raw materials include glass microbeads, polyurethane and vermiculite powder;

The vermiculite powder accounts for 5-15wt% of the total mass of the polyurethane and the vermiculite powder. In this embodiment, the vermiculite powder accounts for 10wt% of the total mass of the polyurethane and the vermiculite powder. The particle size obtained by mixing and granulating at 95°C with the existing technology is: After the particles are 1 to 3 mm in size, the particles obtained by kneading are loosely mixed with glass microbeads. The loose volume ratio of glass microbeads and particles is 5 to 8:100. The mixing temperature is 68°C, and the fluidity of the polyurethane needs to be controlled during the secondary mixing. Therefore, the mixing temperature should be strictly controlled to be 67-70°C. After mixing, an elastic material containing glass beads reinforced particles is obtained;

The glass microbeads selected above are hollow borosilicate glass microbeads, the particle size of the hollow borosilicate glass microbeads is 220-350 μm, and the wall thickness is 5-20 μm. The particle size of the glass microbeads selected in this embodiment is It is 280μm and the wall thickness is 15μm.

Compared with the existing polyurethane elastic material, the elastic material reinforced by glass microbeads made by the above method has more excellent elastic modulus and compression resistance and buffering performance. Compared with the existing polyurethane elastic material, the resistance of the optical cable The compressive capacity can be increased by about 14-18%, and at the same time, with the structure of the optical cable of the present invention, the roundness of the optical cable can still be effectively maintained after multi-directional deformation occurs.

In addition, in the above-mentioned process, the hollow borosilicate glass microspheres must be mixed and added after the vermiculite powder and polyurethane are mixed and granulated, and added directly during the first mixing and granulation process to form the preparation of elastic materials at one time. It will lead to poor uniformity of the three components. Compared with the existing polyurethane elastic material, the compression resistance of the optical cable is not significantly improved, and even a certain reduction in hardening occurs. Tests have shown that when the elastic material obtained by one-time mixing is used in an optical cable, the compression resistance of the optical cable can be increased by about -3 to 7%.

After the arc-shaped force guide 400 is installed, the compression resistance of the optical cable can be further improved;

Specifically, as shown in FIG. 3 , when the optical cable is acted on by the external force F2 in the direction of the force-conducting section 302 of the force-conducting frame member 300, it will actually directly act on the arc-shaped force-conducting member 400 to form a force F3. Affected by the force F3, the two ends of the 400 will be tilted outward along the c direction along the circumferential direction of the optical cable. The arc-shaped force guide member 400 is close to one end of the block 301 of the force guide frame member 300 , and will drive the end of the block 301 embedded in the sheath layer 200 to be overturned and deformed along the d direction, and pass the block 301 of the force guide frame member 300 and the guide force. The segment 302 forms the guiding force in the e-direction and the f-direction, realizes the buffering and offset of the external force, reduces the actual radial force of the inner core wire 100, and has a good compression resistance effect.

In the technical solution of the present invention, if the force-guiding frame members 300 abut against each other, the compressive effect will be significantly reduced, the compressive ability will not be good, and the flexibility of the optical cable will be significantly affected.

In addition, the optical cable of the present invention is also excellent in torsion resistance. The optical cable with the structure shown in FIG. 1 can drive the inner core wire 100 to twist after rotating 22.6° clockwise, and can drive the inner core wire 100 to twist after rotating 17.2° counterclockwise. Therefore, the optical cable of the present invention has good anti-twisting performance in addition to flexible properties and good compression resistance.

Claims (10)

1. A crush-resistant optical cable, comprising:

the inner core wire and the sheath layer are sleeved outside the inner core wire;

the outer surface of the inner core wire and the inner surface of the sheath layer are not contacted with each other and are separated from each other to form an annular cavity;

the optical cable is characterized in that a plurality of separated force guiding framework pieces with J-shaped cross sections are evenly embedded in the sheath layer in the circumferential direction around the axis of the optical cable, each force guiding framework piece is composed of a block and a force guiding section, each block is in a semi-arc shape and embedded in the sheath layer, one end of each force guiding section extends into the annular cavity from the inner surface of the sheath layer, the force guiding section is attached to the outer surface of the inner core wire in the annular cavity and the inner surface of the sheath layer, and one end of each force guiding section is connected with the corresponding block.

2. The crush-resistant optical cable according to claim 1,

the fan-shaped angle of the force guiding framework pieces on the radial section of the optical cable is alpha, the number of the force guiding framework pieces is x, and the alpha is 360/x +/-5 degrees.

3. The crush-resistant optical cable according to claim 1,

and a rubber layer is arranged on the outer surface of the inner core wire.

4. The crush-resistant optical cable according to claim 3,

the rubber used by the rubber layer is damping rubber.

5. The crush-resistant optical cable according to claim 1,

the sheath layer is also internally provided with an arc-shaped force guide piece which protrudes outwards;

the arc-shaped force guide pieces are uniformly arranged between the blocks of the force guide framework pieces along the circumferential direction of the optical cable, and the number of the arc-shaped force guide pieces is equal to that of the force guide framework pieces.

6. The crush-resistant optical cable according to claim 5,

the arc-shaped force guide piece and the force guide framework piece are both made of elastic materials strengthened by glass beads.

7. The crush-resistant optical cable according to claim 6,

the elastic material is prepared from the raw materials of glass beads, polyurethane and vermiculite powder.

8. The crush-resistant optical cable according to claim 7,

the vermiculite powder accounts for 5-15 wt% of the total mass of the polyurethane and the vermiculite powder.

9. The crush-resistant optical cable according to claim 7,

the glass beads are hollow borosilicate glass beads, the particle size of the hollow borosilicate glass beads is 220-350 mu m, and the wall thickness is 5-20 mu m.

10. The crush-resistant optical cable according to claim 7,

the elastic material is prepared by the following method:

Adding vermiculite powder into polyurethane, mixing and granulating, then loosely mixing the obtained granules and glass beads, and carrying out secondary mixing to obtain the glass bead reinforced elastic material.

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