CN103676016B - A kind of butterfly optical cable and joint thereof - Google Patents

Abstract

The invention discloses a joint, which comprises a ferrule positioning part installed in a docking part with one end thereof, a cavity is opened in the axial direction of the ferrule positioning part, and a fixing part is inserted in the cavity. The bare optical fiber at the front end of the butterfly cable penetrates the fixing part in the axial direction and is inserted into the ferrule of the ferrule positioning part. The fixing part is a transparent shell; since the fixing part is a transparent shell, so , when the bare optical fiber at the front end of the butterfly cable penetrates into the fixed part, the staff can observe the insertion of the optical fiber in the fixed part from the outside, so as to ensure the straightness of the optical fiber and avoid damage to the optical fiber; the structure of the connector makes the optical fiber pass through The process of inserting the joint is visible, thereby ensuring the controllability of the assembly process, and the installation is more reliable, reducing the failure rate of the joint. The invention also discloses a butterfly optical cable comprising the joint.

Description

A butterfly optical cable and its connector

technical field

The invention relates to the technical field of optical cable connection accessories, in particular to a joint for a butterfly optical cable. The present invention also relates to a butterfly optical cable comprising the above joint.

Background technique

With the rapid development of my country's communication industry, the construction of long-distance core network optical cables between cities and towns has basically taken shape, and the optical cables of local loop networks, user loop networks, and cable television networks have also received increasing attention. After the distance transmission, the home must be realized. At present, the butterfly optical cable is mostly used as the main carrier of the fiber-optic home.

Butterfly optical cable, also known as leather cable, is named for its cross-sectional shape similar to a butterfly. The two sides of the butterfly cable are reinforcements for stress dispersion and stress bearing, and the middle is an optical fiber. It is a large-scale application. It is used for the fiber optic cable of the user drop-in section in the fiber-to-the-home (FTTH) network, and is also suitable for the fiber-optic cable of the user drop-in section of other fiber-optic access fiber-to-the-office (FTTO) and fiber-to-the-building (FTTB) networks.

The joints at both ends of the traditional butterfly cable include a fixed part with a convex point and a ferrule positioning part with a concave point. Before the butterfly cable is docked with the docking part, the fixed part of the joint is snapped into the ferrule positioning part Inside, the convex point is snapped into the concave point to realize positioning assembly. During the installation process, the staff rely on experience to pass the optical fiber into the fixed part, and then insert the combined connector into the docking part.

However, during the installation process of the above-mentioned bow-shaped optical fiber connector, the fixing part needs to be pushed into the ferrule positioning part. When the applied force is too large, the fixing part may be pushed into the bottom of the inner hole of the ferrule positioning part, resulting in The core positioning part is damaged; and when the optical fiber penetrates into the fixed part, because it cannot be observed, the penetration length of the optical fiber in the fixed part is not easy to control, the installation process of the joint is time-consuming and laborious, and the installation reliability is low, and the joint is unqualified The rate is higher.

Therefore, how to simplify the assembly process of the butterfly cable joint, make the assembly process controllable, improve the installation reliability, and reduce the failure rate of the joint has become an urgent problem to be solved by those skilled in the art.

Contents of the invention

The object of the present invention is to provide a joint for butterfly optical cable, the structure of which makes the process of optical fiber threading into the joint visible, thereby ensuring the controllability of the assembly process, and the installation is more reliable, reducing the joint's inconsistencies. Pass rate. Another object of the present invention is to provide a butterfly optical cable comprising the above connector.

The joint for the butterfly optical cable provided by the present invention includes a ferrule positioning part installed in the docking part with one end thereof, and a cavity is opened in the axial direction of the ferrule positioning part, and a cavity is inserted in the cavity. The fixing part is inserted into the ferrule of the ferrule positioning part, the optical fiber exposed at the front end of the butterfly cable penetrates into the fixing part along the axial direction, and the fixing part is a transparent shell.

Preferably, the outer wall of the fixing component is in contact with the inner wall of the cavity.

Preferably, the optical fiber outer fixing sleeve is provided with a protective tube.

Preferably, the inner wall of the protective tube is bonded to the optical fiber.

Preferably, the joint between the protective tube and the optical fiber is frosted.

Preferably, a buckle is provided between the protection tube and the fixing part, and the protection tube and the fixing part are fixedly connected by the buckle.

Preferably, the opening of the buckle gradually increases from the inside to the outside along the direction in which the butterfly cable is clipped in.

Preferably, an annular spacer is provided at the joint between the optical fiber and the ferrule.

Preferably, it also includes an elastic protection sleeve axially sleeved on the ferrule, the elastic protection sleeve expands and contracts along the axial direction of the ferrule, and protrudes from the outer end surface of the ferrule in a natural state.

Preferably, the elastic protective sleeve is a spring, and the outer diameter of the outer end of the spring is smaller than the outer diameter of the inner end.

The present invention also provides a butterfly optical cable, comprising a covered wire, an optical fiber disposed in the covered wire, and a joint installed at the front end of the optical fiber; the joint is the joint as described above.

The joint provided by the present invention is used for butterfly optical cables, and the joint includes a ferrule positioning part installed in the docking part with one end thereof. A cavity is opened in the axial direction of the ferrule positioning part, and a fixed The exposed optical fiber at the front end of the butterfly cable penetrates into the fixed part in the axial direction, and the fixed part is a transparent shell; since the fixed part is a transparent shell, when the exposed optical fiber at the front end of the butterfly cable passes through When entering the fixed part, the staff can observe the insertion of the optical fiber into the fixed part from the outside, so as to ensure the straightness of the optical fiber and avoid damage to the optical fiber; the structure of the connector makes the process of the optical fiber penetrate into the connector visible, thus ensuring The assembly process is controllable, and the installation is relatively reliable, which reduces the unqualified rate of joints.

In a specific embodiment, the joint provided by the present invention includes a protective tube, which is fixedly sleeved on the outer periphery of the bare optical fiber, and is seamlessly joined with the optical fiber by bonding, and the protective tube is a silicon tube , so as to ensure the strength of the protective tube and improve the stress resistance of the protective tube.

In another specific embodiment, a buckle is provided between the protection tube of the joint provided by the present invention and the fixing part, and is fixedly connected through the buckle, and the buckle is bonded to the protection tube so as to improve At the same time, during the bonding process, the curing process of the glue does not need to occupy the normal process time, thereby improving the production efficiency of the joint assembly.

Description of drawings

Fig. 1 is a structural schematic diagram of a specific embodiment of a butterfly optical cable provided by the present invention.

detailed description

The core of the present invention is to provide a joint for butterfly optical cable. The structure of the joint makes the process of the optical fiber threading into the joint visible, thus ensuring the controllability of the assembly process, and the installation is more reliable, which reduces the inconvenience of the joint. Pass rate. Another core of the present invention is to provide a butterfly optical cable comprising the above connector.

In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 1 . FIG. 1 is a schematic structural diagram of a specific embodiment of a butterfly optical cable provided by the present invention.

In a specific embodiment, the joint provided by the present invention is used for butterfly optical cable 3, the joint includes a ferrule positioning part 1 and a fixing part 2, and the joint is installed in the installation cavity of the docking part through one end of the ferrule positioning part 1 Inside, a cavity is opened in the axial direction of the ferrule positioning part 1, and the fixing part 2 is inserted into the cavity to realize a fixed connection with the ferrule positioning part 1, and the exposed optical fiber 31 at the front end of the butterfly optical cable 3 penetrates in the axial direction The fixing part 2 is inserted into the ferrule 6 of the ferrule positioning part, and the fixing part 2 is a transparent shell.

The outer wall of the fixing part 2 can fit the inner wall of the cavity to cover the opening of the cavity and avoid water ingress in the cavity; an annular gasket can be arranged at the joint between the above-mentioned optical fiber and the ferrule 6 to also play a role. to the sealing effect.

It should be pointed out that the above connector not only includes the ferrule positioning part 1 and the fixing part 2, but also includes other parts on the existing connector, for example, there is a ferrule 6 inside the ferrule positioning part 1, and the exposed optical fiber 31 The ferrule 6 is fixed in the ferrule positioning part 1 by inserting the ferrule 6, and the ferrule 6 is covered with a spring 7, and the ferrule 6 and the spring 7 are fixed in the fixing part 2, and the free expansion and contraction range of the spring is guaranteed.

One end of the ferrule positioning part 1 can be connected to the docking part in a variety of ways. Specifically, a card slot can be provided on the docking part, and the ferrule positioning part 1 is inserted in the installation cavity of the docking part; Internal threads are provided on the inner surface of the ferrule positioning part 1, and external threads matching the above-mentioned internal threads are provided on the external surface of the ferrule positioning part 1, and the connection between the ferrule positioning part 1 and the docking part is realized by threaded connection.

The above-mentioned fixing part 2 is a transparent casing, and the material of the transparent casing may be a transparent resin material, or other transparent materials conventionally used in this field, such as glass fiber reinforced plastics and the like.

In this way, when the bare optical fiber 31 at the front end of the butterfly cable 3 penetrates into the fixed part 2, the staff can observe the insertion of the optical fiber 31 in the fixed part 2 from the outside, thereby ensuring the straightness of the optical fiber 31 and avoiding damage to the optical fiber 31 ; The structure of this joint makes the process of the optical fiber 31 penetrate the joint visible, thereby ensuring the controllability of the assembly process, and the installation is relatively reliable, reducing the failure rate of the joint; meanwhile, it can also be seen from the following table that the use of When the shell is transparent, the time between lines is greatly shortened, which significantly improves the efficiency of quality inspection.

Table 1

A protective tube 4 can be set outside the exposed optical fiber 31 at the front end of the butterfly optical cable 3. Because the quality of the optical fiber 31 is relatively brittle, it is easy to break during installation. external stress, avoiding damage to the optical fiber 31 during installation, and improving safety performance.

The protective tube can be a transparent silicone rubber tube. Through the synergistic effect of the transparent protective tube and the transparent fixing parts, in the subsequent quality inspection, it is not necessary to repeatedly disassemble the protective tube to check whether the internal product is qualified, thereby significantly improving the quality. Inspection efficiency. As can be seen from the table below, transparent

When the casing and the transparent protective tube work together, the efficiency of quality inspection can be significantly improved.

Table 2

Preferably, the above-mentioned protective tube 4 and the optical fiber 31 can be seamlessly joined, so that the protective tube 4 can better disperse and bear external stress, thereby better protecting the optical fiber 31 inside it.

The protective tube 4 and the optical fiber 31 can be seamlessly joined by bonding, or can be realized by other methods conventionally used in this field. For example, the protective tube 4 can be made into a slightly elastic tube, and the protective tube 4 can be set on Outside the optical fiber 31, make the protective tube 4 hoop and cling to the optical fiber 31; the following table shows the comparison between the tensile performance of bonding and the tensile performance of riveting. This method can greatly improve the tensile properties of parts.

table 3

In addition, in the bonding process between connecting parts, it is preferable to use 495 glue, as can be seen from the table below, its bonding performance is much higher than other common glues.

Table 4

glue type Adhesion Viscose 30 Increase about 10N 495 glue Increase about 20N

The joint between the protective tube and the optical fiber can be frosted to increase the friction between the two contact surfaces and improve the fixing strength; The connection strength between connection parts can be significantly improved.

table 5

The above-mentioned protective tube 4 can be a silicon tube, so as to ensure the strength of the protective tube 4 and improve the stress resistance of the protective tube 4; obviously, the protective tube 4 is not limited to the silicon tube, and it can also be other conventionally used in the art. Material tubes, such as copper tubes, etc.

A buckle 5 is provided between the protection tube 4 and the fixing part 2 , and is fixedly connected by the buckle 5 to ensure the reliability of the connection between the protective cover and the fixing part 2 .

The buckle 5 above can be a rectangular block with the same width everywhere along the direction in which the butterfly cable 3 is inserted, or it can be a trapezoidal buckle, and the trapezoidal buckle opens from the inside to the outside along the direction in which the butterfly cable 3 is inserted. Gradually increase, so that during the installation process of the buckle 5 and the butterfly cable 3, the outer edge of the buckle 5 is prevented from colliding with the butterfly cable 3, and the installation of the buckle 5 is facilitated.

The buckle 5 is bonded to the protective tube 4 so as to improve the stretch resistance of the joint. At the same time, during the bonding process, the curing process of the glue does not need to occupy the normal process time, thereby improving the production efficiency of the joint assembly.

The joint provided by the present invention also includes an elastic protective sleeve 8 axially sleeved on the ferrule. The elastic protective sleeve 8 expands and contracts along the axial direction of the ferrule and protrudes beyond the ferrule in a natural state. The outer end face of the core; when the ferrule is inserted into the docking part, the elastic protective sleeve 8 is compressed to the bottom of the ferrule positioning part by the inward pressure of the docking part, which will not affect the normal use of other parts; when the ferrule is removed from the docking part When being pulled out, the elastic protective sleeve 8 returns to the state of natural elongation. At this time, since the elastic protective sleeve 8 protrudes from the outer end surface of the ferrule on the outside, it can protect the outer end surface of the ferrule from being damaged by impact, causing damage. To the role of the protective ferrule.

The above-mentioned elastic protective sleeve 8 is a spring, and the outer diameter of the outer end of the spring is smaller than the outer diameter of the inner end; such a tapered design enables the elastic protective sleeve 8 to be compressed into a flat state, thereby avoiding the insertion of the ferrule and the docking part The length is affected, which ensures the normal use of the ferrule.

In order to protect the ferrule, it is not limited to the use of the above-mentioned elastic protective sleeve 8, and the following structure can also be adopted: a raised point is provided at the corresponding position where the inner surface of the docking part cooperates with the ferrule, and a protection that can be ejected is provided in the ferrule positioning part. The protective ring protrudes axially from the outer end face of the ferrule in the natural state, so as to protect the plastic head from collision and friction. When the ferrule is inserted into the docking part, the protective ring is stuck by the bump to define The position of the protection ring does not affect the normal insertion of the ferrule.

In addition to the above connector, the present invention also provides a butterfly cable 3 comprising the above connector, the butterfly cable 3 includes a covered wire, an optical fiber 31 disposed in the covered wire and a connector installed at the front end of the optical fiber 31, the butterfly cable 3 For the structures of other parts, please refer to the prior art, and details will not be repeated here.

The butterfly optical cable and its joint provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. A joint for butterfly optical cable, characterized in that it includes a ferrule positioning part (1) installed in the docking part with its one end, and the axial direction of the ferrule positioning part (1) is provided with a cavity , a fixing part (2) is inserted in the cavity, and the optical fiber (31) exposed at the front end of the butterfly cable (3) penetrates the fixing part (2) in the axial direction and is inserted into the ferrule In the ferrule (6) of the positioning part (1), the fixing part (2) is a transparent shell; It also includes an elastic protective sleeve (8) axially sleeved on the ferrule. The elastic protective sleeve (8) expands and contracts along the axial direction of the ferrule and protrudes beyond the center of the ferrule in a natural state. outer end face. 2. The joint for the butterfly optical cable according to claim 1, characterized in that, the outer wall of the fixing part (2) is attached to the inner wall of the cavity. 3. The joint for butterfly optical cable according to claim 1, characterized in that, the outer fixing sleeve of the optical fiber (31) is provided with a silicone rubber transparent protective tube (4). 4. The joint for butterfly optical cable according to claim 3, characterized in that, the inner wall of the protection tube (4) is bonded to the optical fiber (31). 5. The joint for butterfly optical cable according to claim 3, characterized in that, the joint between the protective tube and the optical fiber is frosted. 6. The joint for butterfly optical cable according to claim 3, characterized in that, a clasp (5) is provided between the protection tube (4) and the fixing part (2), and the protection The pipe (4) is fixedly connected with the fixing part (2) through the buckle (5). 7. The joint for the butterfly optical cable according to claim 6, characterized in that, the opening of the buckle (5) gradually increases from the inside to the outside in the direction along which the butterfly optical cable (3) is inserted. . 8. The joint for butterfly optical cable according to any one of claims 1 to 6, characterized in that, a ring gasket is provided at the joint between the optical fiber and the ferrule (6). 9. The joint for butterfly optical cable according to claim 1, characterized in that, the elastic protective sleeve (8) is a spring, and the outer diameter of the outer end of the spring is smaller than the outer diameter of the inner end. 10. A butterfly optical cable, comprising a covered wire, an optical fiber (31) arranged in the covered wire and a joint installed at the front end of the optical fiber (31); it is characterized in that the joint is as claimed in claim 1 to 9. The joint described in any one of the above.