Arc Chute Shield Apparatus for Circuit Breaker Support Protection
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Solution Overview
Problem
Existing arc chutes in circuit interrupters are vulnerable to damage from electrical arcs due to the susceptibility of nonconductive support structures and the high cost and difficult placement of arc quenching materials.
Innovation Solution
An improved arc chute with a shield apparatus featuring plate-like shield members and a support apparatus that generates gases to extinguish arcs, where the shield members are retained between arc plates and the support structure without adhesives or separate fastening systems, protecting the support structure from arc damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If arc quenching materials are placed in the vicinity of the support structure, then arc extinguishment is facilitated and support structure protection is improved, but manufacturing cost increases and placement difficulty increases
Solution Approach 1:
The patent employs shield members made from relatively inexpensive materials positioned between the arc plates and support structure. These shield members serve as a sacrificial protective layer that can be replaced or are designed for single-use during arc events, eliminating the need for expensive arc quenching materials while maintaining protection effectiveness.
Solution Approach 2:
The shield members act as an intermediary component between the arc plates and the support structure. This intermediate layer absorbs and dissipates arc energy, protecting the support structure without requiring direct placement of expensive arc quenching materials in critical positions.
2Reliability
If adhesives or separate fastening systems are used to hold shield members in place, then retention reliability is improved, but manufacturing cost increases and assembly complexity increases
Solution Approach 1:
The shield members are designed to be self-retaining through their geometric configuration. The shield members fit into recesses or between components in a way that automatically secures them without requiring external fastening systems, adhesives, or additional retention mechanisms.
Solution Approach 2:
The retention function is merged into the structural design of the shield members and arc chute components. The geometric interlocking between shield members and arc plates/support structure combines the shielding function and retention function into a single integrated solution, eliminating separate fastening systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively extinguishes arcs, protects the support structure from damage, reduces costs by eliminating the need for adhesives or fasteners, and enhances assembly efficiency and reliability.
Implementation Method 1
shield members that are structured to generate gases in the presence of an arc
Data Source
AI summary
An improved circuit breaker and arc chute has a shield apparatus that includes a number of plate-like shield members (56) that have elongated openings (60) formed therein to receive portions of arc plates (14) therethrough. The portions of the arc plates that pass through the shield member are received in receptacles of a support apparatus that supports the arc plates. The arc plates are themselves configured to retain the shield members against the support apparatus to protect the support apparatus from damage in the event of an electrical arc. Advantageously, the retention of the shield members between portions of the arc plates and portions of the support apparatus enables the shield members to be held in place without the use of adhesives or separate fastening systems. The shield members (56) are structured to generate gases in the presence of an electric arc.