Triple insulator for a bearing cable and process for manufacturing

Abstract

The invention relates to a triple insulating bearing cable insulator, which comprises an insulator core rod (1) and a single-ear connecting hardware (3), characterized in that two positioning sleeves (2) are arranged at intervals in the two ends of the insulator core rod (1), a first synthetic silicon rubber umbrella skirt combination (4) is arranged between the two positioning sleeves (2), and a second synthetic silicon rubber umbrella skirt combination (5) and a third synthetic silicon rubber umbrella skirt combination (6) are arranged between the two positioning sleeves (2) and the single-ear connecting hardware (3) at the two ends. The technical design of the invention is mainly formed in the same insulator, so that the installation position of the pendant device on both sides of the insulator is insulated again. After installation, the upper end of the pendant device is in an insulating state, the pendant device can be ensured not to conduct electricity and carry current, and the occurrence of the fault of electric corrosion and electric shock of the pendant device caused by the contact of the pendant device in the past under the current-carrying state and the shaking can be avoided.

Description

Technical Field

[0001] This invention relates to catenary insulators for the insulated connection of overhead contact lines in electrified railways, and more particularly to a triple-insulated catenary insulator specifically designed for sectional insulators. Background Technology

[0002] Currently, in domestic and international electrified railway catenary power supply systems, the insulators used on the catenary cables above all sectionalizers lack the advanced technology and electrical insulation advantages of the dedicated 'triple-insulation catenary cable insulators' for sectionalizers. In current catenary power supply systems, the dropper devices of sectionalizers are generally connected at one end to the catenary conductor and at the other end to the sectionalizer insulator, or connected to the contact line away from the sectionalizer to suspend and control the sectionalizer. This connection structure causes the dropper device of the sectionalizer insulator to be constantly in a current-conducting state. When an electric locomotive draws current through the catenary sectionalizer section, the dropper device becomes a current conductor. At this time, due to excessive current and vibration causing poor contact, electric arcs are generated in the dropper device, frequently resulting in electrolytic corrosion or electric shock damage to the wire rope in the dropper device. Summary of the Invention

[0003] The purpose of this invention is to design a device that ensures the dropper string is non-conductive and non-current-carrying, thus preventing electro-corrosion and electric shock damage to the dropper string caused by current-carrying conditions and inconsistent contact due to vibration. The technical solution adopted to achieve this invention is: a triple-insulated load-bearing cable insulator, comprising an insulator core rod and single-ear connecting hardware, characterized in that: two positioning sleeves are spaced apart at both ends of the insulator core rod; a first synthetic silicone rubber shed assembly is fixed between the two positioning sleeves; and a second and third synthetic silicone rubber shed assembly are fixed between the two positioning sleeves and the single-ear connecting hardware at both ends, respectively. The first synthetic silicone rubber shed assembly is composed of several first synthetic silicone rubber small sheds; the second and third synthetic silicone rubber shed assemblies are both composed of synthetic silicone rubber large and small sheds formed by several second synthetic silicone rubber small sheds arranged between two large synthetic silicone rubber sheds, with at least one second synthetic silicone rubber small shed. The first synthetic silicone rubber umbrella skirt assembly can also be composed of several second synthetic silicone rubber small umbrella skirts placed between several two large synthetic silicone rubber umbrella skirts. The first, second, and third synthetic silicone rubber umbrella skirt assemblies are injection molded in one step using a silicone rubber mold.

[0004] The manufacturing process of this invention is as follows;

[0005] First, the positioning sleeves are fitted onto the inner sides of both ends of the insulator core rod and pressed firmly to secure them. Then, the single-ear connecting fittings are installed on the heads of both ends of the insulator core rod and pressed firmly. Next, the core rod is placed into a silicone rubber mold and injection molded in one step to form the first, second, and third synthetic silicone rubber skirt assemblies. The resulting triple-insulated catenary insulator is complete. This design provides reasonable and safe electrical insulation, improves creepage distance and insulation strength, and is simple to manufacture and easy to install.

[0006] This invention relates to a triple-insulated catenary insulator, characterized by enlarged awnings on both sides of the insulator's interior for re-insulating the dropper positioning sleeves. These positioning sleeves are used to clamp the dropper device and suspend the segmented insulators. The overall structure of the triple-insulated catenary insulator is designed and formed within a single insulator. First, a long-distance insulator insulates the dropper positioning sleeves on both sides. Then, enlarged awnings insulate the connecting hardware. The enlarged awnings on both sides not only insulate the dropper positioning but also significantly increase the creepage distance of the entire insulator. After the entire catenary is connected, the segmented insulator is specifically connected and suspended at the dropper positioning points within its insulated area. This innovative technology truly improves the insulator's insulation strength and ensures that the dropper device does not conduct current.

[0007] This invention allows the segmented insulator's dropper devices to be installed inside both sides of the insulator, protecting them from electrical shock. The main design element of this invention is that it is formed within the same insulator, further insulating the dropper device mounting positions on both sides of the insulator. This design ensures that the upper end of the dropper device is insulated after installation, guaranteeing that the dropper device is non-conductive and non-current-carrying. This avoids the electrical corrosion and electrical shock damage to the dropper device that occurred in the past when it was in a current-carrying state or due to vibration and inaccurate contact. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0009] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0010] Figure 3 This is a side view of the structure of the present invention;

[0011] Figure 4 This is a schematic diagram of the exploded structure of the present invention.

[0012] In the diagram, 1 is the insulator core rod, 2 is the positioning sleeve, 3 is the single-ear connecting hardware, 4 is the first synthetic silicone rubber umbrella skirt assembly, 5 is the second synthetic silicone rubber umbrella skirt assembly, 6 is the third synthetic silicone rubber umbrella skirt assembly, 7 is the first synthetic silicone rubber small umbrella skirt, 8 is the synthetic silicone rubber large umbrella skirt, and 9 is the second synthetic silicone rubber small umbrella skirt. Detailed Implementation

[0013] Referring to the accompanying drawings, a triple-insulated load-bearing cable insulator includes an insulator core rod 1 and single-ear connecting fittings 3. Its key feature is that two positioning sleeves 2 are spaced apart at both ends of the insulator core rod 1. A first synthetic silicone rubber skirt assembly 4 is fixed between the two positioning sleeves 2. A second synthetic silicone rubber skirt assembly 5 and a third synthetic silicone rubber skirt assembly 6 are fixed between the two positioning sleeves 2 and the single-ear connecting fittings 3 at both ends, respectively. The first synthetic silicone rubber skirt assembly 4 is composed of several first synthetic silicone rubber small skirts 7. The second synthetic silicone rubber skirt assembly 5 and the third synthetic silicone rubber skirt assembly 6 are both composed of several second synthetic silicone rubber small skirts 9 arranged between two large synthetic silicone rubber skirts 8, with at least one second synthetic silicone rubber small skirt 9. The first synthetic silicone rubber skirt assembly 4 can also be composed of several synthetic silicone rubber large and small skirts. The first synthetic silicone rubber skirt assembly 4, the second synthetic silicone rubber skirt assembly 5, and the third synthetic silicone rubber skirt assembly 6 are injection molded in one step using a silicone rubber mold.

[0014] The manufacturing process of this invention is as follows;

[0015] First, the positioning sleeve 2 is fitted onto the inner sides of both ends of the insulator core rod 1 and pressed firmly. Then, the single-ear connecting hardware 3 is installed on the heads of both ends of the insulator core rod 1 and pressed firmly. Next, the insulator is placed into a silicone rubber mold and injection molded in one step to form the first synthetic silicone rubber shed assembly 4, the second synthetic silicone rubber shed assembly 5, and the third synthetic silicone rubber shed assembly 6. The formed triple-insulated catenary insulator is then complete. This design provides reasonable and safe electrical insulation, improves creepage distance and insulation strength, and is simple to manufacture and easy to install.

Claims

1. A triple-bundled dead-end conductor insulator comprising an insulator core rod (1) and a single-ear connecting fitting (3), characterized in that: Two positioning sleeves (2) are arranged at intervals in the two ends of an insulator core rod (1), and the positioning sleeves (2) are used to clamp a suspension string device for suspending a sectional insulator, a first synthetic silicon rubber umbrella skirt combination (4) is arranged between the two positioning sleeves (2), a second synthetic silicon rubber umbrella skirt combination (5) and a third synthetic silicon rubber umbrella skirt combination (6) are arranged between the two positioning sleeves (2) and single-ear connecting fittings (3) at the two ends, the first synthetic silicon rubber umbrella skirt combination (4) is composed of a plurality of first synthetic silicon rubber small umbrella skirts (7), the second synthetic silicon rubber umbrella skirt combination (5) and the third synthetic silicon rubber umbrella skirt combination (6) are each composed of two synthetic silicon rubber large umbrella skirts (8) with a plurality of second synthetic silicon rubber small umbrella skirts (9) arranged therebetween, and the number of the second synthetic silicon rubber small umbrella skirts (9) is at least one. The first synthetic silicon rubber umbrella skirt combination (4), the second synthetic silicon rubber umbrella skirt combination (5) and the third synthetic silicon rubber umbrella skirt combination (6) are formed by one-time injection molding of a silicon rubber mold.

2. A process for making the triple insulator of claim 1, characterized by: First, the positioning sleeves (2) are sleeved and fixed at certain positions on the inner sides of the two ends of the insulator core rod (1), then the single-ear connecting fittings (3) are installed at the two end heads of the insulator core rod (1) and are pressed tightly, and then the first synthetic silicon rubber umbrella skirt combination (4), the second synthetic silicon rubber umbrella skirt combination (5) and the third synthetic silicon rubber umbrella skirt combination (6) are put into a silicon rubber mold for one-time injection molding, and the formed triple-insulated load cable insulator is completed as a whole.

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