CN203773122U - Microtubule used for blown fiber, and optical cable - Google Patents

Abstract

Disclosed is a microtubule used for a blown fiber, and an optical cable. The microtubule used for the blown fiber comprises a pipeline which defines pipeline space for passage of the optical cable; and an elongated traction component which extends over the whole pipeline space and is used for traction of the optical cable into the microtubule. The utility model also relates to the optical cable comprising an optical fiber; an optical cable external sheath which is arranged in a way of surrounding the optical fiber so that an optical fiber accommodating space is formed; and a reinforcing rib which is arranged in the accommodating space and suitable for being connected with the tail end of the elongated traction component in the aforementioned microtubule so that traction by the elongated traction component is realized. The technical scheme is utilized so that passage of the optical fiber through the whole microtubule can be ensured even the microtubule is over-length or bends.

Description

Microtubes and cables for blowing optical fibers

technical field

The utility model relates to the field of blown optical fiber, in particular to a microtube for blowing optical fiber and an optical cable suitable for matching with the microtube for blowing optical fiber.

Background technique

Blowing fiber optic system can be used when carrying out fiber optic wiring in buildings or between buildings. Specifically, the micropipe can be pre-laid in the building, and when the optical fiber is actually needed, the optical fiber is blown into the micropipe by compressed air and terminated.

The micropipe used in the prior art has a simple structure, often only providing a channel for the optical cable without any additional function.

In the case of microtubes that are too long or have curved arrangements, there are likely to be situations where the cable cannot be blown through the entire microtube with compressed air.

Utility model content

The purpose of the utility model is to provide a micropipe for blowing optical fiber, which can ensure that the optical cable passes through the entire micropipe even when the micropipe is too long or bent.

For this reason, the utility model proposes a micropipe for blowing optical fiber, comprising: a pipe, the pipe defines a pipe space for the optical cable to pass through; into microtubules.

The pipe may include an outer jacket tube layer and a Kevlar tube layer engaged with an inner wall surface of the outer jacket layer. The pipe may also include a lubricating tube layer, which provides lubricating properties for the optical cable to pass through, and is bonded to the inner wall of the Kevlar tube layer. The inner wall surface of the lubricating tube layer in contact with the optical cable may be provided with a silicon core layer.

The utility model also relates to an optical cable, comprising: an optical fiber; an outer sheath of the optical cable arranged around the optical fiber to form an optical fiber accommodation space; The distal end of the traction member is connected for traction by the elongated traction member. Optionally, the optical cable further includes at least one Kevlar strand disposed in the accommodation space.

Utilizing the technical scheme of the utility model, it can ensure that the optical cable passes through the entire micropipe even when the micropipe is too long or bent.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a microtube according to an exemplary embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of an optical cable according to an exemplary embodiment of the present invention.

Detailed ways

Although the utility model will be fully described with reference to the accompanying drawings that contain preferred embodiments of the utility model, it should be understood that those of ordinary skill in the art can modify the utility model described herein while obtaining the advantages of the utility model. technical effect. Therefore, it should be understood that the above description is a broad disclosure for those skilled in the art, and its content is not intended to limit the exemplary embodiments described in the present invention.

As shown in Figure 1, the utility model relates to a micropipe 100 for blowing optical fiber, comprising: a duct 110, which defines a duct space S1 for the optical cable to pass through; and an elongated traction member 120, which extends through the entire duct The space S1 is used for pulling the optical cable 200 ( FIG. 2 ) into the microduct 100 . The elongated pulling member 120 can be a pulling rope or a pulling rod, and its end can be connected with the reinforcing rib 230 in the optical cable 200 so as to pull the optical cable into the microduct 100 .

Optionally, the pipeline 110 includes an outer sheath layer 111 and a Kevlar layer 112 , and the Kevlar layer 112 is bonded to the inner wall of the outer sheath 111 . The Kevlar tube layer 112 is several strands of Kevlar twisted together, which can provide excellent tensile and deformation resistance properties for the microtubes.

Further optionally, the duct 110 further includes a lubricating tube layer 113 , the lubricating tube layer 113 provides lubricating performance for the optical cable 200 to pass through, and is bonded to the inner wall of the Kevlar tube layer 112 . The inner wall surface of the lubricating tube layer 113 in contact with the optical cable may be provided with a silicon core layer. In this way, good lubricity can be provided for the optical cable to facilitate the passage of the optical cable during air blowing or pulling.

The outer sheath tube layer is generally made of flame-retardant, low-smoke, and halogen-free materials, which will not produce toxic gases when burned. The outer sheath can be made of high density polyethylene plastic or, where high temperature resistance is required, cross-linked polyethylene plastic.

When manufacturing the above-mentioned microtube, the elongated traction member can be prefabricated in the pipe when manufacturing the pipe. Any method of prefabricating the elongated traction member within the duct may be used. For example, an elongated traction member may be provided first, and then a duct around said elongated traction member is progressively formed along said elongated traction member substantially with said elongated traction member as a longitudinal axis. It is also possible to introduce the elongated traction element into the pipe after the pipe has been manufactured.

The present invention also relates to an optical cable 200 suitable for cooperating with the elongated pulling member 120 in the microtube 100 . Referring to Fig. 2, the optical cable 200 includes: an optical fiber 210; an outer sheath 220 of the optical cable, arranged around the optical fiber 210 to form an optical fiber accommodation space S2; The end of the elongated traction member 120 in is connected to be pulled by the elongated traction member 120 .

The reinforcing rib 230 can not only provide excellent mechanical strength for the whole optical cable, but also cooperate with the elongated pulling part in the microtube as a pulling joint.

The optical fiber 210 may be a multi-core optical fiber, such as a 12-core optical fiber and a 24-core optical fiber.

When high temperature resistance is required, the outer sheath 220 of the optical cable can also be made of cross-linked polyethylene plastic.

As shown in FIG. 2 , the optical cable 200 may further include at least one Kevlar strand 240 disposed in the accommodating space S2. Kevlar strands 240 may be twisted to connect the ribs 230 and the ends of the elongated traction members 120 together. In addition, the Kevlar strands 240 can also enhance the overall strength of the optical cable.

When the fiber optic cable 200 needs to be blown into the micropipe 100, the end of the elongated pulling part 120 in the micropipe 100 can be connected with one end of the reinforcing rib 230 of the fiber optic cable 200 (for example, by binding), and then Use compressed air to blow the optical cable 200, specifically, use compressed air to blow the optical cable 200 from one end of the micropipe 100 and cooperate with the pulling effect of the external force on the elongated pulling member 120 to make the optical cable 200 from one end of the micropipe 100 through to the other end of the microtubules. As the fiber optic cable 200 moves within the microtube 100, the elongated pulling member 120 gradually moves out of the microtube 100. In other words, after the optical cable 200 is placed in the microtube 100, the elongated pulling member 120 also completely withdraws from the microtube, at this time, the elongated pulling member exposed from the microtube 100 and connected to the reinforcing rib 120 removed.

When fixing the end of the elongated pulling member 120 and one end of the reinforcing rib 230, if there is a Kevlar strand 240 in the optical cable 200, the Kevlar strand 240 can be used to wrap the end of the elongated pulling member 120 and the end of the rib 230. One end of the rib 230 .

In addition, when the optical cable 200 that has been blown into the microduct needs to be replaced, the reinforcing rib 230 in the other optical cable can be connected with the reinforcing rib 230 in the optical cable in the microduct (for example, by binding), that is, the One end of the reinforcing rib of the optical cable in the micropipe is connected with one end of the reinforcing rib of the optical cable to be blown in. In the case where the Kevlar strand 240 is present in the optical cable 200 , the ends of the two ribs may be wrapped with the Kevlar strand 240 . In this way, the fiber optic cable located within the microduct functions as the elongated pulling member described above. Afterwards, use compressed gas to blow the first optical cable from one end of the micropipe and cooperate with the traction of the second optical cable by an external force to make the first optical cable penetrate from one end of the micropipe to the other end of the micropipe one end. Thereafter, the second optical cable exposed from the micropipe and connected to the rib of the first optical cable is removed.

In the utility model, when there is no optical cable in the micropipe, due to the existence of the slender traction part, even if the distance of the laid micropipe is very long or there are bends, the traction effect of the slender traction part can be used when blowing into the optical cable And ensure that the optical cable passes through the micropipe smoothly. In addition, when the above-mentioned optical cable has been blown into the micropipe, when the optical cable needs to be replaced, since the optical cable is provided with a reinforcing rib, the connection between the reinforcing ribs of the two optical cables can be used to make the existing optical cable in the micropipe act as a The traction part of the additional optical cable to be blown into the micropipe, so that even if the laid micropipe is very long or there are bends, the traction effect of the already existing optical cable in the micropipe can be used to ensure the blown optical cable when blowing into the optical cable. smoothly through the microtubules.

Although exemplary embodiments incorporating the principles of the invention have been disclosed above, the invention is not limited to the disclosed embodiments. On the contrary, this application is intended to cover any variations, uses or adaptations of the invention using the general principles of the invention. Moreover, it is intended that the invention cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.

Claims (7)

1. blow an optical fiber microtubule, for optical cable is installed, comprising:

Pipeline, described pipeline limits the pipeline space passing through for optical cable; And

Elongated traction element, the whole described pipeline space of extend through, for drawing optical cable into microtubule.

2. microtubule according to claim 1, wherein:

Described pipeline comprises oversheath pipe layer and Kev trombone slide layer, and described Kev trombone slide layer engages with the internal face of external sheath layer.

3. microtubule according to claim 2, wherein:

Described pipeline also comprises lubrication management layer, and described lubrication management layer is for optical cable is by greasy property is provided, and engages with the internal face of Kev trombone slide layer.

4. microtubule according to claim 3, wherein:

The internal face contacting with described optical cable of described lubrication management layer is provided with silicon core layer.

5. microtubule according to claim 1, wherein:

Elongated traction element is traction rope or drawing bar.

6. an optical cable, comprising:

Optical fiber;

Cable outer sheath, forms optical fiber spatial accommodation around optical fiber setting; And

Reinforcement, is arranged in described spatial accommodation, is suitable for being connected to be drawn by described elongated traction element with the end of elongated traction element in microtubule described in any one in claim 1-5.

7. optical cable according to claim 6, also comprises:

At least one Kev draws strand, is arranged in described spatial accommodation.