Optical fiber insulator and manufacturing process thereof

Abstract

The invention relates to the technical field of parts of measuring devices using light modulation devices, in particular to an optical fiber insulator and a manufacturing process thereof. The optical fiber insulator is improved, especially the core rod is improved, the aramid fiber and epoxy resin composite core rod is adopted, the mass ratio of the aramid fiber to the epoxy resin is 10%-14%, the mass ratio of the epoxy resin to the aramid fiber is 86%-90%, the aramid fiber and the epoxy resin which are larger in resistivity are compounded, the overall resistivity of the core rod is increased, and the electrical insulating property of the core rod is improved; meanwhile, the aramid fibers have better structural strength, and the mechanical performance of the core rod is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of parts of a measuring device using an optical modulation device, and in particular to an optical fiber insulator and a manufacturing process thereof. Background Art

[0002] An all-fiber current transformer is a current conversion device that uses optical fiber as a sensitive medium. It is currently widely used in power equipment. As an important component of an all-fiber current transformer, the insulation and structural properties of the fiber optic insulator have a great impact on the reliability and service life of the product. The Chinese invention patent application with application publication number CN117169570A discloses an optical fiber current transformer, which mainly optimizes the design of the optical fiber insulator to improve the connection reliability and electrical insulation performance between the core rod and the end flange in the optical fiber insulator. The core rod used is a ring-shaped glass fiber composite material, but the resistivity of the glass fiber is relatively low, which affects the resistivity of the entire core rod, generally between 1.45E9 and 2.89E9Ω·cm. When used in a DC transmission system with a higher voltage level, there is still a problem of insufficient electrical insulation reliability. Summary of the invention

[0003] The purpose of the present invention is to provide a manufacturing process for optical fiber insulators to solve the problem of insufficient reliability of electrical insulation of existing optical fiber current transformers at high voltage levels. At the same time, the purpose of the present invention is also to provide an optical fiber insulator made by the above manufacturing process to solve the same problem.

[0004] The optical fiber insulator manufacturing process of the invention comprises manufacturing a core rod of the optical fiber insulator, wherein the core rod of the optical fiber insulator is compounded by aramid fiber and epoxy resin, wherein the mass percentage of the aramid fiber is 10%-14% and the mass percentage of the epoxy resin is 86%-90%.

[0005] Furthermore, after the two ends of the prepared core rod are connected with the end flanges and before the insulating shed is formed by injection molding on the outer side of the core rod, insulating glue is applied to the end surface of the end flange where the core rod is inserted.

[0006] Furthermore, the end flange includes a flange plate and an inserting pipe section extending from the middle of the flange plate, and the cross-sectional shape of the end face of the inserting pipe section is an arc shape.

[0007] Furthermore, a small diameter section is processed on the outer circumference of one end of the insertion tube section for inserting the core rod to form a stepped structure, and at least two annular grooves are arranged on the outer circumference of the small diameter section to form an annular tooth structure, and the insulating umbrella skirt injected on the outside of the core rod completely wraps the small diameter section.

[0008] Furthermore, the outer diameter of the insulating shed wrapping the small diameter section is equal to the outer diameter of the end flange, the minimum outer diameter of the insulating shed wrapping the core rod section is smaller than the outer diameter of the small diameter section, and the two parts are transitioned by a conical surface.

[0009] The present invention improves the manufacturing process of the optical fiber insulator, especially improves the manufacturing of the optical fiber insulator core rod. The original glass fiber and epoxy resin are used to composite the core rod, which is improved to aramid and epoxy resin. The mass ratio of the two is 10%-14% and 86%-90% respectively. The aramid and epoxy resin with higher resistivity are used for composite, which increases the overall resistivity of the core rod and improves the electrical insulation of the core rod. At the same time, the aramid fiber has better structural strength, and the mechanical properties of the core rod are also improved.

[0010] The optical fiber insulator of the present invention comprises a core rod, end flanges inserted at both ends of the core rod, and an insulating shed which is injection-molded on the outside of the core rod and wraps the connecting position of the core rod and the end flange. The core rod is an aramid epoxy resin composite core rod, the mass percentage of aramid is 10%-14%, and the mass percentage of epoxy resin is 86%-90%.

[0011] Furthermore, the end flange includes a flange plate and an inserting pipe section extending from the middle of the flange plate, and the cross-sectional shape of the end face of the inserting pipe section is an arc shape.

[0012] Furthermore, a small diameter section is processed on the outer circumference of one end of the insertion tube section for inserting the core rod to form a stepped structure, at least two annular grooves are arranged on the outer circumference of the small diameter section to form an annular tooth structure, and the insulating umbrella skirt injected on the outside of the core rod completely wraps the small diameter section.

[0013] Furthermore, the outer diameter of the insulating shed wrapping the small diameter section is equal to the outer diameter of the end flange, the minimum outer diameter of the insulating shed wrapping the core rod section is smaller than the outer diameter of the small diameter section, and the two parts are transitioned by a conical surface.

[0014] The present invention improves the optical fiber insulator, especially improves the core rod thereof, adopts aramid and epoxy resin composite core rod, the mass ratio of the two is 10%-14% and 86%-90% respectively, and adopts aramid and epoxy resin with higher resistivity for compounding, thereby increasing the overall resistivity of the core rod and improving the electrical insulation of the core rod. Meanwhile, the aramid fiber has better structural strength, and the mechanical properties of the core rod are also improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the optical fiber insulator of the present invention; Figure 2 for Figure 1 A magnified view of the structure at center.

[0016] In the figure: 1, end flange; 10, plug-in pipe section; 11, small diameter section; 12, annular tooth structure; 2, core rod; 3, optical fiber adhesive; 4, optical fiber; 5, insulating umbrella skirt; 50, cone surface; 6, insulating adhesive. DETAILED DESCRIPTION

[0017] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0018] The present invention changes the material of the optical fiber insulator core rod in the optical fiber current transformer and adopts epoxy resin and aramid fiber with higher resistivity than glass fiber to composite the core rod, thereby improving the mechanical strength and electrical insulation performance of the core rod as a whole and improving the reliability of the current transformer.

[0019] It should be noted that the overall structure of the optical fiber insulator is consistent with the prior art, and includes a hollow core rod 2, with end flanges 1 inserted at both ends of the core rod 2, an insulating shed 5 is formed by injection molding on the outer side of the core rod 2 between the two end flanges 1, a perforation corresponding to the inner hole of the hollow core rod 2 is provided in the middle of the end flange 1, and the optical fiber 4 passes through the two end flanges 1 and the core rod 2, and an optical fiber adhesive 3 is provided in the core rod 2 to wrap the optical fiber 4. Based on the above-mentioned inventive concept, the manufacturing process and structure of the optical fiber insulator of the present invention are described in detail below.

[0020] An embodiment of a manufacturing process for optical fiber insulators, wherein the main difference between the manufacturing process for optical fiber insulators and the existing manufacturing process lies in the manufacturing of the core rod 2. When manufacturing the core rod 2 of the optical fiber insulator, the core rod 2 is made by compounding aramid fiber and epoxy resin, wherein the mass percentage of aramid fiber is 10%-14%, and the mass percentage of epoxy resin is 86%-90%. After experimental comparison, when the mass percentage of aramid fiber and epoxy resin is within this range, the resistivity of the aramid epoxy core rod is between 1.11E10 and 2.22E9Ω·cm, and the mechanical properties and insulation properties of the original core rod 2 are significantly improved.

[0021] After the core rod 2 is obtained, the end flanges 1 are respectively inserted at both ends of the core rod 2, and then the insulating umbrella skirt 5 is formed by injection molding on the outside of the core rod 2. Like the prior art, the end flange 1 includes a flange plate and an insertion tube section extending from the middle of the flange plate, and the core rod 2 is inserted into the insertion tube section. Because the joint position between the core rod 2 and the end flange 1 is the joint position between the metal and the insulating composite material, this place is often a weak point in insulation performance. In the existing process, when the insulating umbrella skirt 5 is injection molded, the end face of the end flange 1 where the core rod 2 is inserted is often not completely poured, which results in bubbles wrapped in the insulating umbrella skirt 5 at this position, which in turn causes weak insulation performance at this location. In order to avoid the occurrence of this problem, such as Figure 1-2As shown, on the basis of the above-mentioned embodiment, in one embodiment of the manufacturing process of the present invention, before the insulating shed 5 is formed by injection molding on the outer side of the core rod 2, an insulating glue 6 is applied to the end face of the end flange 1 at one end where the core rod 2 is inserted. By applying the insulating glue 6, it can be ensured that the insulating glue 6 is fully applied manually and the end face is completely wrapped, so that when the insulating shed 5 is injection molded, the injected glue and the applied insulating glue 6 can be fully contacted and combined, thereby avoiding the generation of bubbles and improving the insulation performance here.

[0022] On the basis of the above-mentioned embodiment, the end face of the end flange 1 for inserting the core rod 2, that is, the end face of the insertion tube section is an annular plane perpendicular to the axis of the core rod 2. In order to avoid the edge of the annular plane from forming a tip structure, in a preferred embodiment, the cross-sectional shape of the end face of the end flange 1 of the optical fiber insulator for inserting the core rod 2 is an arc shape. The arc-shaped end face can make the electric field uniform and play a role in shielding the electric field with the shielding cover. Of course, in other embodiments, the outer peripheral surface of the end of the insertion tube section can be provided with a conical surface 50 section whose diameter gradually decreases in the direction away from the flange.

[0023] On the basis of the above-mentioned embodiment, in a more optimized embodiment, a small diameter section 11 is processed on the outer peripheral surface of the end of the plug-in pipe section away from the flange to form a stepped structure including a large diameter section and a small diameter section 11, a fillet structure is provided at the stepped surface between the large diameter section and the small diameter section 11, at least two annular grooves are provided on the outer peripheral surface of the small diameter section 11 to form an annular tooth structure 12, and the insulating shed 5 injected on the outside of the core rod 2 completely wraps the small diameter section 11. The annular tooth structure 12 formed between the annular grooves can increase the bonding strength between the insulating shed 5 and the end flange 1 when the insulating shed 5 is injection molded. Moreover, the stepped structure, the annular tooth structure 12 and the arc-shaped end surface of the plug-in pipe section cooperate with each other, and are injection-molded and wrapped in the insulating shed 5 and combined and connected with the insulating shed 5, so that the insulation performance is better at this place.

[0024] On the basis of the above embodiments, in one embodiment, the diameter of the hollow rod body of the insulating shed 5 can be consistent with the diameter of the inserted tube section. In another embodiment, under the premise of ensuring the electrical insulation performance of the optical fiber insulator, in order to save materials and reduce weight, the outer diameter of the insulating shed 5 that wraps the small diameter section 11 is equal to the outer diameter of the inserted tube section (large diameter section), and the minimum outer diameter of the insulating shed 5 that wraps the core rod 2 is smaller than the outer diameter of the small diameter section 11, and the two parts are transitioned through a tapered surface 50.

[0025] Embodiments of the optical fiber insulator of the present invention: The structure of the optical fiber insulator has been introduced in the above optical fiber insulator manufacturing process, and will not be further described herein.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A process for manufacturing optical fiber insulators, characterized in that: The invention comprises a core rod for manufacturing an optical fiber insulator. The core rod is compounded by aramid fiber and epoxy resin, wherein the mass percentage of the aramid fiber is 10%-14% and the mass percentage of the epoxy resin is 86%-90%.

2. The optical fiber insulator manufacturing process according to claim 1, characterized in that: After the two ends of the prepared core rod are plugged with end flanges and before the insulating shed is formed by injection molding on the outer side of the core rod, insulating glue is applied to the end surface of the end flange at one end where the core rod is inserted.

3. The optical fiber insulator manufacturing process according to claim 1 or 2, characterized in that: The end flange comprises a flange plate and an inserting pipe section extending from the middle of the plate body of the flange plate, and the cross-sectional shape of the end face of the inserting pipe section is an arc shape.

4. The optical fiber insulator manufacturing process according to claim 3, characterized in that A small diameter section is processed on the outer circumference of one end of the insertion tube section for inserting the core rod to form a stepped structure. At least two annular grooves are arranged on the outer circumference of the small diameter section to form an annular tooth structure. The insulating umbrella skirt injected on the outer side of the core rod completely wraps the small diameter section.

5. The optical fiber insulator manufacturing process according to claim 4, characterized in that: The outer diameter of the insulating shed wrapped around the small diameter section is equal to the outer diameter of the end flange, the minimum outer diameter of the insulating shed wrapped around the core rod is smaller than the outer diameter of the small diameter section, and the two parts are transitioned by a conical surface.

6. An optical fiber insulator, comprising a core rod, end flanges inserted at both ends of the core rod, and an insulating shed molded on the outside of the core rod and wrapping the joint between the core rod and the end flange, characterized in that: The core rod is an aramid-epoxy resin composite core rod, the mass percentage of the aramid is 10%-14%, and the mass percentage of the epoxy resin is 86%-90%.

7. The optical fiber insulator according to claim 6, characterized in that: The end flange comprises a flange plate and an inserting pipe section extending from the middle of the plate body of the flange plate, and the cross-sectional shape of the end face of the inserting pipe section is an arc shape.

8. The optical fiber insulator according to claim 7, characterized in that: A small diameter section is processed on the outer circumference of one end of the insertion tube section for inserting the core rod to form a stepped structure. At least two annular grooves are arranged on the outer circumference of the small diameter section to form an annular tooth structure. The insulating umbrella skirt injected on the outer side of the core rod completely wraps the small diameter section.

9. The optical fiber insulator according to claim 8, characterized in that: The outer diameter of the insulating shed wrapping the small diameter section is equal to the outer diameter of the inserted tube section, the minimum outer diameter of the insulating shed wrapping the core rod section is smaller than the outer diameter of the small diameter section, and the two parts are transitioned by a conical surface.

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