Transparent insulating shield (with arc extinguishing function) of charged drop-out fuse

Abstract

The invention discloses a transparent insulating protective cover (with an arc extinguishing function) for a live-line drop-out fuse, and relates to the technical field of insulation protection of electrical equipment, the transparent insulating protective cover comprises a cover body fitted with the shape of the drop-out fuse with the arc extinguishing function, the cover body is provided with a wire outlet corresponding to a wiring terminal at the upper part of the fuse, and the outlet is provided with a special silica gel piece; an adaptive arc extinguishing cover mounting part is arranged at the position corresponding to the arc extinguishing cover, the cover body is provided with a mounting port, the cover body is of an elastic structure, and the mounting port can be automatically closed and rebounded; the silica gel piece is in interference fit with the wire outlet and has anti-skid lines on the inner wall; the edge of the arc extinguishing cover installation portion is in fillet transition, the gap between the arc extinguishing cover installation portion and the arc extinguishing cover is 0.5-2mm, the cover body is made of polycarbonate materials, the insulativity is larger than or equal to 38KV, the flame retardant grade is V0, the cover body is machined through an injection molding technology, a mold is made of 3Cr13 stainless steel materials, and the protective cover can prevent external interference, facilitates electrified installation and routing inspection and guarantees safe and stable operation of an electric power system.

Description

Technical Field

[0001] This invention relates to the field of electrical equipment insulation protection technology, specifically a transparent insulating cover (with arc extinguishing function) for a live-line drop-out fuse. Background Technology

[0002] Bird damage and floating debris have always been significant threats to the safe and stable operation of power systems during the operation of power lines and equipment. Bird nests, droppings, and floating objects such as plastic bags and packaging bags can easily cause phase-to-phase short circuits in power equipment, leading to accidents such as fires and power outages. This not only seriously affects the safety and reliability of power transmission but can also cause huge losses to economic development and even endanger personal safety.

[0003] Currently, most 10kV equipment insulation sleeves on the market are made of silicone rubber, formed by high-temperature extrusion using a vulcanizing machine mold. During installation, these products require installers to wear safety harnesses and foot straps to climb poles for close-range operation, or to use live-line working vehicles or other live-line equipment for assistance. This is not only costly but also poses a safety risk due to the close-range installation. Furthermore, once installed, the silicone rubber insulation covers completely obscure the equipment, lacking transparency and making it impossible to observe the internal connections, thus hindering equipment inspection and maintenance.

[0004] To address these issues, the present invention provides a transparent insulating cover (with arc extinguishing function) for a live-type drop-out fuse. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a transparent insulating cover (with arc extinguishing function) for a live-type drop-out fuse, thus solving the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a transparent insulating cover (with arc extinguishing function) for a drop-out fuse, comprising a cover that conforms to the external shape of the drop-out fuse with arc extinguishing function, wherein the cover has a wire outlet corresponding to the upper terminal of the fuse, and a special silicone component is installed at the wire outlet; the cover has a matching arc extinguishing cover mounting part corresponding to the position of the fuse arc extinguishing cover, the cover is made of polycarbonate material, with an insulation degree ≥ KV and a flame retardant rating of V, and the cover has an installation port.

[0007] Furthermore, the cover is an elastic structure, and the mounting opening can automatically close and rebound.

[0008] Furthermore, the silicone component is interference-fitted with the wire outlet, and the inner wall of the silicone component is provided with anti-slip texture.

[0009] Furthermore, the edge of the arc-extinguishing cover mounting part is provided with a rounded corner transition structure, and the gap between the arc-extinguishing cover mounting part and the arc-extinguishing cover is 0.5-2mm.

[0010] Furthermore, the processing technology for the transparent insulating cover (with arc extinguishing function) of the drop-out fuse:

[0011] Step 1: Mold closing, close the mold that matches the shape of the shield;

[0012] Step 2: Filling. Molten polycarbonate material (with flame retardant added) is injected into the mold cavity under high pressure, filling the cavity to 95% of its volume.

[0013] Step 3: Hold pressure, continue applying pressure until the mold gate solidifies and seals, ensuring that the material fully fills the cavity;

[0014] Step 4: Cooling, allowing the material inside the mold to cool and solidify. The cooling time is set to 70%-80% of the molding cycle, depending on the thickness of the protective cover.

[0015] Step 5: Open the mold;

[0016] Step 6: Demold and remove the molded protective cover to complete the processing.

[0017] Furthermore, the melting temperature of the polycarbonate material in step 2 is 230-300℃, and the injection pressure is 80-150MPa.

[0018] Furthermore, in step 4, water cooling is used for cooling, and the cooling water temperature is controlled at 20-30℃.

[0019] Furthermore, the mold is made of 3Cr13 stainless steel and the surface is polished with a roughness ≤Ra0.8μm.

[0020] Beneficial effects

[0021] This invention provides a transparent insulating cover (with arc extinguishing function) for a live-type drop-out fuse. Compared with the prior art, it has the following advantages:

[0022] 1. This transparent insulating cover (with arc extinguishing function) for the live-line drop-out fuse is made of polycarbonate material. This material has excellent mechanical, thermal and electrical properties, especially impact resistance, good toughness, low creep, and stable product dimensions. It is also transparent, has good electrical insulation, corona resistance, and ozone stability, which can meet the insulation protection requirements of drop-out fuses. The insulation degree is ≥38KV, the flame retardant rating reaches V0, and the safety is high.

[0023] 2. This live-line drop-out fuse features a transparent insulating cover (with arc extinguishing function). The cover fits snugly to the external shape of the drop-out fuse with arc extinguishing function, effectively protecting the fuse and reducing the impact of external factors such as bird damage and airborne debris. A wire outlet is provided at the upper terminal of the fuse, and a special silicone insert is installed to protect the connection between the wire and the terminal. The silicone insert has an interference fit with the wire outlet and anti-slip texture on the inner wall, ensuring a secure installation and preventing wire loosening.

[0024] 3. The transparent insulating cover (with arc extinguishing function) of the live-line drop-out fuse has a matching arc extinguishing cover mounting part corresponding to the position of the arc extinguishing cover of the fuse, which provides a suitable installation space for the arc extinguishing cover. The edge of the arc extinguishing cover mounting part has a rounded transition structure to avoid damage to the arc extinguishing cover during installation. The gap between the arc extinguishing cover mounting part and the arc extinguishing cover is 0.5-2mm, which does not affect the normal operation of the arc extinguishing cover and can effectively protect it. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a perspective view of the external structure of the present invention;

[0027] Figure 2 This is the main structural view of the present invention;

[0028] Figure 3 This is a side view of the structure of the present invention;

[0029] Figure 4 This is a top view of the structure of the present invention;

[0030] In the diagram: 1. Enclosure; 2. Fire extinguisher enclosure mounting section; 3. Wire outlet; 4. Installation port. Detailed Implementation

[0031] It should be noted that in the description of the embodiments of this application, the terms "front," "rear," "left," "right," "up," "down," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0032] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] Reference Figures 1 to 4 This application provides a transparent insulating cover (with arc extinguishing function) for a drop-out fuse, including a cover 1 that conforms to the external shape of the drop-out fuse with arc extinguishing function. The cover 1 has a wire outlet 3 corresponding to the upper terminal of the fuse, and a special silicone component is installed at the wire outlet 3. The cover 1 has a matching arc extinguishing cover mounting part 2 corresponding to the position of the fuse's arc extinguishing cover. The cover 1 is made of polycarbonate material with an insulation level ≥38KV and a flame retardant rating of V0. The cover 1 has a mounting opening 4. The cover 1 is an elastic structure, and the mounting opening 4 can automatically close and rebound. The silicone component is interference-fitted with the wire outlet 3, and the inner wall of the silicone component has anti-slip texture. The edge of the arc extinguishing cover mounting part 2 has a rounded transition structure, and the gap between the arc extinguishing cover mounting part 2 and the arc extinguishing cover is 0.5-2mm.

[0034] In this embodiment, the protective cover is manufactured using injection molding, which includes the following steps:

[0035] Step 1: Mold closing. Close the mold that matches the shape of the shield. The mold is made of 3Cr13 stainless steel and the surface is polished with a roughness of Ra0.6μm.

[0036] Step 2: Filling. Molten polycarbonate material (with flame retardant added) is injected into the mold cavity under an injection pressure of 100 MPa. The melting temperature of the polycarbonate material is 250°C. The filling is done to 95% of the cavity volume.

[0037] Step 3: Hold pressure, continue applying pressure until the mold gate solidifies and seals, ensuring that the material fully fills the cavity.

[0038] Step 4: Cooling. Use water cooling to cool the material inside the mold. The cooling water temperature is controlled at 25℃. The cooling time is set to 75% of the molding cycle according to the thickness of the protective cover, so that the material cools and solidifies.

[0039] Step 5: Open the mold.

[0040] Step 6: Demold and remove the molded protective cover to complete the processing.

[0041] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0042] Working Principle: From a structural design perspective, the enclosure 1 conforms closely to the external shape of the drop-out fuse with arc extinguishing function, completely enclosing the fuse and forming a physical barrier. This effectively blocks interference from external factors such as bird damage and airborne objects, reducing the occurrence of phase-to-phase short circuits. The enclosure 1 has a wire outlet 3 corresponding to the upper terminal of the fuse, and a dedicated silicone insert is installed. The silicone insert and wire outlet 3 are interference-fitted, and the anti-slip texture on the inner wall ensures a secure installation of the silicone insert, providing excellent protection for the connection between the wire and the terminal, preventing wire loosening, and ensuring the stability of the power connection.

[0043] The enclosure 1 is equipped with a suitable arc-extinguishing cover mounting part 2 corresponding to the position of the fuse arc-extinguishing cover, providing adequate installation space for the arc-extinguishing cover. The rounded corner transition structure of its edges can prevent damage to the arc-extinguishing cover during installation. The gap between the arc-extinguishing cover mounting part 2 and the arc-extinguishing cover is 0.5-2mm, which does not affect the normal arc-extinguishing operation of the arc-extinguishing cover, but also effectively protects it, ensuring the stable performance of the arc-extinguishing function.

[0044] The enclosure 1 is made of polycarbonate material, which has an insulation value of ≥38KV and a flame retardant rating of V0. It possesses excellent electrical insulation and flame retardancy, effectively blocking current and preventing electric shock and fire, thus ensuring the safety of equipment and personnel. Simultaneously, the enclosure 1 has a flexible structure, and the mounting opening 4 can automatically close and rebound, facilitating installation operations by personnel under energized conditions without close contact with the equipment, reducing installation risks. Furthermore, the automatic closure of the mounting opening 4 after installation further enhances the protective effect.

[0045] In terms of processing technology, injection molding is adopted. By rationally controlling steps such as mold closing, filling, holding pressure, cooling, mold opening, and demolding, the shape accuracy and performance stability of the cover body 1 are ensured. The mold is made of 3Cr13 stainless steel with a polished surface and a roughness of ≤Ra0.8μm, ensuring the smoothness and dimensional accuracy of the cover body 1 surface. The polycarbonate material is molded under specific melting temperature, injection pressure, and cooling conditions, giving the cover body 1 excellent mechanical, thermal, and electrical properties, meeting the long-term service requirements of drop-out fuses.

[0046] In addition, the transparency of polycarbonate material allows installers and inspectors to clearly observe the connection status and operating condition of the internal equipment of the fuse without removing the protective cover, which facilitates daily inspection and maintenance, improves work efficiency, and reduces power outage time caused by maintenance.

[0047] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A transparent insulating cover (with arc quenching) for a drop-out fuse, characterized in that: Including with the outside shape of the drop-out fuse with arc extinguishing is in line with the cover (1), the cover (1) is provided with wire outlet (3) at the upper terminal of the fuse, the wire outlet (3) is provided with special silica gel piece, the cover (1) is provided with the arc extinguishing cover mounting portion (2) corresponding the position of the fuse arc extinguishing cover, the cover (1) is made of polycarbonate material, insulation ≥38KV, the combustion flame retardant level reaches V0 level, the cover (1) is provided with mounting port (4).

2. The transparent insulating cover (with arc quenching) for a drop-out fuse according to claim 1, characterized in that: The cover (1) is a resilient structure, the mounting port (4) can be automatically closed rebound.

3. The transparent insulating cover (with arc quenching) for a drop-out fuse according to claim 1, characterized in that: The silica gel piece and wire outlet (3) are interference fit, and the inner wall of the silica gel piece is provided with anti-skid lines.

4. The transparent insulating cover (with arc quenching) for a drop-out fuse according to claim 1, characterized in that: The edge of the arc extinguishing cover mounting portion (2) is provided with a round corner transition structure, and the gap between the arc extinguishing cover mounting portion (2) and the arc extinguishing cover is 0.5-2mm.

5. A process for manufacturing the transparent insulating cover (with arc quenching) of the drop-out fuse according to any one of claims 1-4, characterized in that: Using injection molding process, including the following steps: Step 1: close the mold, close the mold matched with the shape of the cover; Step 2: filling, polycarbonate material (adding flame retardant) in molten state is injected into the mold cavity under high pressure, filling to 95% of the cavity volume; Step 3: pressure maintaining, continuously apply pressure until the mold gate solidification sealing, ensure that the material is fully filled in the cavity; Step 4: cooling, the material in the mold is cooled and solidified, the cooling time is set according to the thickness of the cover, which is 70%-80% of the molding cycle; Step 5: open the mold; Step 6: demolding, take out the molded cover, complete the processing.

6. The process of claim 5, wherein: The melting temperature of the polycarbonate material in step 2 is 230-300℃, and the injection pressure is 80-150MPa.

7. The process of claim 5, wherein: In step 4, water cooling is used for cooling, and the cooling water temperature is controlled at 20-30℃.

8. The process of claim 5, wherein: The mold is made of 3Cr13 stainless steel material, and the surface is polished, with roughness ≤Ra0.8μm.

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