Fuse Lid Handle with Self-Locking Venting for Overpressure Release
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Solution Overview
Problem
Existing fuse lids in medium voltage or high-voltage switchgear pose a risk of overpressure and ejection when opened, endangering operators and polluting the surroundings due to gas and dust release.
Innovation Solution
A handle for the fuse lid that allows controlled venting of overpressure through a self-locking mechanism with a pin and slot arrangement, preventing axial movement without external force, ensuring safe and controlled opening and closing of the fuse canister.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fuse lid is opened directly to replace the fuse, then the operator can access the fuse for replacement, but overpressure causes the fuse lid to shoot out endangering the operator and polluting the surroundings
Solution Approach 1:
The opening process is segmented into multiple stages: first rotating the handle to the first position to partially open the lid for pressure equalization, then rotating to the second position to fully open the lid for fuse replacement. This staged approach allows controlled venting of overpressure before complete opening, preventing the lid from shooting out while maintaining operator safety.
Solution Approach 2:
Before fully opening the fuse lid for fuse replacement, the handle is first rotated to the first position to perform preliminary pressure equalization. This preliminary action vents overpressure from the canister through the sealing ring gap, preventing dangerous pressure release when the lid is fully opened and protecting both the operator and environment.
2Ease of operation
If the handle is designed to allow free movement of the fuse lid, then the lid can be easily opened and closed, but the lid cannot be held securely in place during pressure changes
Solution Approach 1:
The handle mechanism provides dynamic positioning with two distinct stable positions. At the first position, the lid is partially open allowing pressure equalization while still secured. At the second position, the lid is fully open for fuse replacement. The slot-pin mechanism dynamically adapts to different operational phases, providing both ease of operation and position stability under varying pressure conditions.
Solution Approach 2:
The slot in the handle acts as an intermediary mechanism between the operator's manual operation and the fuse lid positioning. The pin engaged in the slot provides controlled movement and secure positioning, mediating between the need for easy opening/closing and the requirement for stable positioning during pressure changes.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c~2d
AI summary
The present disclosure relates to a handle (20) of a fuse lid (2). The handle comprises a grip portion (21); a joint (22) via which the handle is pivotably attached to the fuse lid; and a slot (23) arranged to be in mesh with a pin (24) immovably attached to the canister (1). In a first pivot position of the handle, the pin can enter or exit the slot. In a second pivot position of the handle, the pin is self-lockingly located in the slot while allowing gas to vent from the canister. In a third pivot position of the handle, the pin is self-lockingly located in the slot while gas tightly sealing the canister.