Dual throw knife switch

By introducing a support spring and an insulating oil arc-extinguishing cover into the double-throw knife switch, the problems of enlarged knife clamp opening and poor arc extinguishing effect are solved, ensuring circuit stability and safety and extending the service life of the equipment.

CN224417685UActive Publication Date: 2026-06-26FUZHOU HUI YIDA ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
FUZHOU HUI YIDA ELECTRIC CO LTD
Filing Date
2025-07-21
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing double-throw knife switches are prone to poor contact due to the widening of the knife clip opening during long-term use, and the arc extinguishing effect is also poor, posing a safety hazard.

Method used

The tool holder uses a spring to tightly fit the insulating column against the two sides of the tool holder. The tool holder is equipped with a spring that stores insulating oil. An arc-extinguishing hood 9 is fixed in the fixed seat and stores insulating oil. The arc-extinguishing grid plate works together to quickly extinguish the arc. The tool holder is supported by the spring to ensure good contact.

Benefits of technology

It effectively avoids the problem of the blade holder opening becoming larger due to long-term use, ensures good contact between the blade and the blade holder, reduces the generation of electric sparks, and achieves rapid extinguishing of electric arcs through the cooperation of insulating oil and arc-extinguishing grid plates, thus extending the service life of the equipment and improving safety.

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    Figure CN224417685U_ABST
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Abstract

The utility model discloses a kind of double-throw knife switch, belong to the technical field of knife switch, including insulating base and two protective covers movably connected to the surface of insulating base, the surface of the insulating base is installed with multiple knife holders, the surface of the insulating base is installed with knife seat, and two blades are rotatably connected in knife seat, the top of the blade is installed with insulating handle, the both sides of the knife holder are evenly provided with the fixed seat of fixed connection with insulating base, the side of fixed seat towards knife holder is provided with moving hole, and support spring is placed in moving hole, the side of support spring is provided with the insulating column for supporting knife holder, the surface of fixed seat is fixed with arc extinguishing cover, and arc extinguishing cover stores insulating oil, the side outer wall of arc extinguishing cover is installed with arc extinguishing louver. The double-throw knife switch, compact structure, safe and reliable, applicable to power supply switching scene in power system.
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