Circuit Breaker Housing Stabilization via Horned Contact Clamping
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Solution Overview
Problem
Circuit breakers with high switching capacities face issues with housing wall stability and assembly complexity due to high pressure development during short circuits, leading to potential damage and tear of the upper part.
Innovation Solution
The use of fixed contact pieces with horned contours that form a clamp in the switching chamber, reducing wall deflection by 20-25% and enhancing sealing, while maintaining assembly simplicity through integrated lug and counter-contours within the contact slide receiving device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the circuit breaker is designed for high switching capacities (up to 100 kA), then the switching capacity is improved, but the housing walls are subjected to very high pressure development causing bending and potential tearing
Solution Approach 1:
The circuit breaker housing is divided into multiple chambers (first switching chamber and second switching chamber) that are pressure-separated. The partition wall between chambers prevents pressure from affecting the entire housing simultaneously, allowing the housing to withstand high switching capacities without excessive stress on individual wall sections.
Solution Approach 2:
A pressure equalization chamber is introduced as an intermediary space between the two switching chambers. This chamber absorbs and equalizes pressure variations, protecting the housing walls from extreme pressure differentials while maintaining the high switching capacity functionality of the individual chambers.
2Strength
If adhesive connections are used to fasten parts in the housing, then thermal and mechanical stresses are reduced, but the assembly becomes complex requiring precise fitting of two parts
Solution Approach 1:
The partition wall is designed with an integrated L-shaped protrusion that directly forms the adhesive connection structure. This merging of the partition wall and connection element eliminates the need for separate adhesive application steps and precise fitting of two independent parts, while still providing the stress resistance benefits of adhesive connections.
Solution Approach 2:
The L-shaped protrusion on the partition wall automatically creates the adhesive connection interface during assembly. The geometry of the protrusion itself provides the connection function without requiring additional components or complex assembly procedures, making the system self-sufficient for its own fastening needs.
3Force
If the lower part of the circuit breaker is pressed on during short circuits, then the housing provides structural support, but the upper part may tear out
Solution Approach 1:
The housing is segmented into pressure-separated chambers that prevent force transmission from the lower part to the upper part during short circuits. The partition wall with pressure equalization capability ensures that compressive forces on the lower part do not propagate to create tensile stresses that could cause the upper part to tear.
Solution Approach 2:
The pressure equalization chamber acts as a mediator that decouples the mechanical forces between the lower and upper parts of the housing. During short circuits, this intermediary chamber absorbs and distributes pressure uniformly, preventing the concentration of forces that would lead to tearing of the upper part while maintaining structural support.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a circuit breaker with a contact slide (10) in which a movable switching element (12) is mounted on a spring (11) and is arranged opposite a fixed switching element (1). The invention is characterized in that the fixed switching element (1) has a horn-shaped contour (2, 3) which engages in counter contours (15) of the switching chamber walls of the circuit breaker.