Composite insulator and optical fiber embedding method

Abstract

The invention discloses a composite insulator and an optical fiber embedding method, and relates to the field of optical fiber preparation, the composite insulator comprises a core rod and a coating layer, the cross section of the core rod is provided with at least one groove used for laying an optical fiber core, the coating layer adopts an extrusion mold to extrude a silicone rubber coating layer located at the bottom layer in the groove, and the composite insulator further comprises an outer coating layer, the cross section of a core rod is designed to be in a gear shape with a plurality of grooves in the periphery, glass fibers are soaked in epoxy resin glue and then are subjected to pultrusion through a gear-shaped mold, the outer surface of the core rod is coated with a coupling agent, an extrusion mold is adopted to extrude a silicone rubber coating layer on the bottom layer in the gear grooves, and optical fiber core single layers are laid on the silicone rubber coating layer in the grooves side by side. The method comprises the following steps of: extruding an outer coating layer, performing high-temperature vulcanization to prepare a composite core rod embedded with an optical fiber after the extrusion is completed, then installing an umbrella cover on the composite core rod in a bonding coupling mode, and finally cutting off a section of outer coating layer at two ends of the insulator and installing a flange in a crimping or cementing mode.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber preparation, in particular to a composite insulator and an optical fiber embedding method. Background Art

[0002] With the continuous development of optical communication technology, many high-voltage primary equipment in the power system currently use optical fiber insulators to solve the insulation and signal communication problems between high and low voltage components. At present, there are two main mainstream technical solutions for optical fiber insulators. One is to use a hollow core rod, through which the optical fiber passes, and the insulating medium is filled inside. In this solution, it is difficult to solve the problems of filling gaps, bubble control during the filling process, and thermal expansion and contraction of the medium. The other is to machine a spiral groove on the outer surface of the core rod, lay the optical fiber in the groove, and then bury the optical fiber in the outer surface of the core rod by injection molding. The main defects of this solution are that the secondary machining destroys the continuity of part of the glass fiber in the rod core rod, reduces the mechanical strength of the core rod, and the spiral machining groove is very difficult to process, with low production efficiency. High temperature and high pressure during injection molding can easily cause damage to the optical fiber.

[0003] Therefore, there is a need for a composite insulator that can effectively protect optical fibers and improve production efficiency. Summary of the invention

[0004] In view of the above problems existing in the composite insulator, the present invention is proposed.

[0005] Therefore, the problem to be solved by the present invention is how to prepare optical fiber with high efficiency.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a composite insulator, comprising a core rod, the cross section of which is configured to have at least one groove, the groove being used to lay the optical fiber core; a coating layer comprising a silicone rubber coating layer and an outer coating layer; and an extrusion die is used to extrude the silicone rubber coating layer in the groove.

[0007] As a preferred solution of the composite insulator of the present invention, the glass fibers are impregnated with epoxy resin glue and then pultruded through a gear-shaped die, so that the glass fibers in the core rod are intact.

[0008] As a preferred solution of the composite insulator of the present invention, the thickness of the silicone rubber coating layer is lower than the depth of the groove of the core rod.

[0009] As a preferred solution of the composite insulator of the present invention, the groove is annularly arranged on the core rod.

[0010] As a preferred solution of the composite insulator of the present invention, the number of optical fiber cores to be laid is required to be at least one.

[0011] As a preferred solution of the composite insulator of the present invention, the optical fiber core is provided with a tight sheath so that the optical performance will not change when the extrusion stress and temperature change.

[0012] As a preferred solution of the composite insulator described in the present invention, the optical fiber core is embedded in the silicone rubber coating layer through multiple layers of extrusion, and the optical fiber core and the silicone rubber are tightly fitted without air gaps. The optical fiber core is arranged in the groove to protect the optical fiber core.

[0013] Another object of the present invention is to provide an optical fiber embedding method, which is applied to the above-mentioned composite insulator, the method comprising: providing at least two grooves on a core rod, and the cross section is gear-shaped; impregnating the glass fiber with epoxy resin glue and then pultruding it through a gear-shaped mold adapted to the core rod, coating the outer surface of the core rod with a coupling agent, and using an extrusion mold to extrude the bottom silicone rubber coating in the gear groove; laying a single layer of optical fiber cores on the silicone rubber coating in the groove, and then extruding an outer coating; after the extrusion is completed, high-temperature vulcanization is performed to form a composite core rod with embedded optical fiber, and then an umbrella cover is installed on the composite core rod by bonding coupling; and after cutting off a section of the outer coating at both ends of the insulator, a flange is installed by crimping or gluing.

[0014] As a preferred solution of the optical fiber embedding method of the present invention, the glass fiber is impregnated with epoxy resin glue and then pultruded through a gear-shaped mold.

[0015] As a preferred solution of the optical fiber embedding method of the present invention, the silicone rubber coating layer and the outer coating layer are both formed by coating a coupling agent and then extruding.

[0016] The beneficial effects of the present invention are as follows: through the improvement of various components and preparation processes, the optical fiber core can be effectively protected. At the same time, due to the filling of the insulating medium in the prior art, bubbles are easily generated during the filling process, resulting in a decrease in the performance of the insulator;

[0017] At the same time, compared with the existing spiral grooves, our grooves can avoid the destruction of the continuity of the glass fiber in the core rod due to secondary processing, and can ensure the mechanical strength of the core rod;

[0018] In addition, the improved embedded optical fiber method reduces the overall processing difficulty and improves the overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0020] Figure 1 This is the scene diagram of the composite insulator.

[0021] Figure 2 This is a structural diagram of a composite insulator. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it an embodiment that is mutually exclusive with other embodiments, either individually or selectively.

[0025] Example 1

[0026] Reference Figure 1 and Figure 2 , which is the first embodiment of the present invention, provides a composite insulator. The composite insulator includes a core rod 100 and a coating layer 200. The core rod 100 has been prepared according to a mold before leaving the factory and is then used in the preparation process of the composite insulator.

[0027] Specifically, the core rod 100 has a cross section configured to have at least one groove 101 , and the groove 101 is used to lay the optical fiber core 102 .

[0028] Preferably, the coating layer 200 includes a silicone rubber coating layer 201 and an outer coating layer 202;

[0029] An extrusion die is used to extrude the silicone rubber coating layer 201 into the groove 101 .

[0030] Preferably, the glass fibers are impregnated with epoxy resin and then pultruded through a gear-shaped die, so that the glass fibers in the core rod 100 are intact.

[0031] Preferably, the thickness of the silicone rubber coating layer 201 is less than the depth of the groove 101 of the core rod 100 .

[0032] Preferably, the groove 101 is annularly arranged on the core rod 100 .

[0033] Preferably, the number of optical fiber cores 102 laid can be adjusted according to demand, and the number of laid requires at least one to be laid;

[0034] The number of optical fiber cores 102 laid is customized according to engineering requirements. One optical fiber core 102 is one signal channel. If there is one optical fiber core in each groove 101, there can be at least 4 signal channels. In engineering, 32 signal channels can be achieved, that is, 8 optical fiber cores 102 in each groove 101, but it can also be adjusted according to requirements.

[0035] Preferably, the optical fiber core 102 has a tight sheath to prevent changes in optical performance due to extrusion stress and temperature changes.

[0036] Preferably, the optical fiber core 102 is embedded in the silicone rubber coating 201 through multiple layers of extrusion. The silicone rubber has a certain elasticity, which can prevent the optical fiber core 102 from being damaged during the embedding process. The optical fiber core 102 and the silicone rubber fit tightly without any air gap. The optical fiber core 102 is arranged in the groove 101 to protect the optical fiber core 102.

[0037] When in use, the cross section of the core rod 100 is designed to be a gear shape with several grooves 101 on the outer periphery. The glass fiber is impregnated with epoxy resin glue and then pultruded through a gear-shaped mold. A coupling agent is coated on the outer surface of the core rod 100. An extrusion mold is used to extrude the bottom silicone rubber coating 201 in the gear groove. The optical fiber core 102 is laid side by side in a single layer on the silicone rubber coating 201 in the groove 101, and then the outer coating 202 is extruded. After the extrusion is completed, high-temperature vulcanization is performed to form a composite core rod with embedded optical fiber. Then, the umbrella cover 300 is installed on the composite core rod by adhesive coupling. Finally, a section of the outer coating 202 at both ends of the insulator is cut off and the flange 301 is installed by crimping or gluing.

[0038] Example 2

[0039] Reference Figure 1-2 , which is the third embodiment of the present invention, and is based on the first two embodiments.

[0040] Specifically, at least two grooves 101 are formed on the mandrel 100, and the cross section is gear-shaped;

[0041] After impregnating the glass fiber with epoxy resin, the fiber is pultruded through a gear-shaped die that matches the core rod 100, a coupling agent is coated on the outer surface of the core rod 100, and an extrusion die is used to extrude the bottom silicone rubber coating layer 201 in the gear groove;

[0042] The optical fiber core 102 is laid in a single layer on the silicone rubber coating layer 201 in the groove 101, and then an outer coating layer 202 is extruded;

[0043] After the extrusion is completed, high temperature vulcanization is performed to form a composite core rod with embedded optical fiber, and then the umbrella cover 300 is installed on the composite core rod by bonding coupling;

[0044] After a section of the outer coating 202 at both ends of the insulator is cut off, the flange 300 is installed by crimping or gluing.

[0045] Preferably, the glass fiber is impregnated with epoxy resin and then pultruded through a gear-shaped die.

[0046] Preferably, the silicone rubber coating layer 201 and the outer coating layer 202 are both formed by coating a coupling agent and then extruding.

[0047] When in use, there is no need for secondary processing of the core rod 100 , and the core rod 100 can be kept in its inherent shape at the factory for optical fiber preparation, which protects the continuity of the glass fiber inside the core rod 100 and ensures the mechanical strength of the core rod 100 .

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A composite insulator, characterized in that: include, A core rod (100) having a cross section configured to have at least one groove (101), wherein the groove (101) is used to lay an optical fiber core (102); A coating layer (200), comprising a silicone rubber coating layer (201) and an outer coating layer (202); An extrusion die is used to extrude the silicone rubber coating layer (201) in the groove (101).

2. The composite insulator according to claim 1, characterized in that: The glass fibers are impregnated with epoxy resin and then pultruded through a gear-shaped die, so that the glass fibers in the core rod (100) are intact.

3. The composite insulator according to claim 2, characterized in that: The thickness of the silicone rubber coating layer (201) is lower than the depth of the groove (101) of the core rod (100).

4. The composite insulator according to claim 3, characterized in that: The groove (101) is annularly arranged on the core rod (100).

5. The composite insulator according to claim 4, characterized in that: The number of optical fiber cores (102) to be laid is required to be at least one.

6. The composite insulator according to claim 5, characterized in that: The optical fiber core (102) is provided with a tight sheath so that the optical performance will not change when the extrusion stress and temperature change.

7. The composite insulator according to claim 6, characterized in that: The optical fiber core (102) is embedded in the silicone rubber coating layer (201) through multiple layers of extrusion, and the optical fiber core (102) and the silicone rubber are tightly fitted without air gaps. The optical fiber core (102) is arranged in the groove (101) to protect the optical fiber core (102).

8. A method for embedding an optical fiber, characterized in that: Applied to the composite insulator according to claims 1 to 7, the embedding method comprises: The mandrel (100) is provided with at least two grooves (101), and the cross section is gear-shaped; After impregnating the glass fiber with epoxy resin glue, the glass fiber is pultruded through a gear-shaped die matched with the core rod (100), a coupling agent is coated on the outer surface of the core rod (100), and a silicone rubber coating layer (201) of the bottom layer is extruded into the gear groove using an extrusion die; Laying the optical fiber cores (102) in a single layer on the silicone rubber coating layer (201) in the groove (101), and then extruding an outer coating layer (202); After the extrusion is completed, high temperature vulcanization is performed to form a composite core rod with embedded optical fiber, and then an umbrella cover (300) is installed on the composite core rod by bonding coupling; After a section of the outer coating layer (202) at both ends of the insulator is cut off, the flange (300) is installed by crimping or gluing.

9. The method for embedding an optical fiber according to claim 8, wherein: The glass fiber is impregnated with epoxy resin and then pultruded through a gear-shaped die.

10. The method for embedding an optical fiber according to claim 9, wherein: The silicone rubber coating layer (201) and the outer coating layer (202) are both formed by coating a coupling agent and then extruding.

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