Rotating Gate Exhaust Channel for Circuit Breaker Debris Clearance

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Solution Overview

Problem

Existing single-pole switching units with rotating gates suffer from obstruction of the gas discharge channel due to solid debris buildup, preventing repeated operation after arc occurrence.

Innovation Solution

A rotating gate design with an edge positioned across from the inner wall of the exhaust channel, maintaining a constant distance until a threshold angle, then increasing linearly to fully open the channel, ensuring clear gas passage and preventing obstruction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If a rotating gate is used to trigger the circuit breaker, then quick triggering is achieved, but solid debris builds up in the gas discharge channel causing obstruction

Engineering Contradiction:

Improvetriggering speedVSAvoidchannel operability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The gate is designed to rotate dynamically from a closed position to an open position during the triggering sequence. This dynamic movement allows the gate to clear debris from the channel while maintaining the quick triggering function. The rotation mechanism ensures that the gate edge sweeps through the channel, preventing debris accumulation that would otherwise block repeated operations.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The harmful effect of solid debris in the channel is converted into a beneficial cleaning action. The rotating gate, driven by the high-pressure gas discharge, uses the same gas flow that causes debris generation to rotate the gate and sweep debris from the channel. This transforms the harmful debris-laden gas flow into a useful cleaning mechanism that prevents channel obstruction.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If the rotating gate remains in obstruction position, then triggering is prevented, but channel clearing is achieved

Engineering Contradiction:

Improvechannel clarityVSAvoidtriggering capability

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The gate operates periodically, alternating between closed and open positions. During normal operation, the gate remains closed to prevent triggering. Upon arc detection, the gate rotates open to allow gas discharge and triggering. After triggering, the gate returns to closed position, ready for the next operation. This periodic action ensures both channel clarity and triggering capability are maintained at appropriate times.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The gate is positioned in the closed obstruction position as a preliminary protective measure before triggering occurs. This preliminary positioning prevents accidental or premature triggering while maintaining the ability to trigger quickly when needed. The system is pre-configured with the gate closed, ensuring reliability before the triggering event occurs.

Inventive Principle:

Principle #10Preliminary action

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 allows for quick and repeated triggering of the switching unit by maintaining channel openness, enabling effective discharge of switching gases and preventing debris-induced blockages.

Implementation Method 1

switching gases pass through the exhaust channels and cause triggering of the opening contacts

Methodology Applied

Scientific EffectGas flow:

Implementation Method 2

the distance between said edge and said inner wall remains constant and equal to said first distance up to a first threshold value of the angle of rotation of the rotating gate, then increases linearly up to a second rotation angle threshold value

Methodology Applied

Scientific EffectLinear motion:

Implementation Method 3

solid debris builds up in the gas discharge channel, causing obstruction of the channel and preventing the operation of the device multiple times

Methodology Applied

Scientific EffectDebris prevention:

Data Source

PatentUS9508511B2Single-pole switching unit and switching unit comprising one such unit

Publication Date: 2016.11.29 SCHNEIDER ELECTRIC IND SAS

AI summary

The invention relates to a single-pole switching unit having a housing comprising a moving contact bridge and a pair of fixed contacts cooperating with said moving contact bridge and respectively connected to a current intake conductor, two electric arc cutoff chambers respectively opening onto an open volume of the moving contact bridge, each cutoff chamber being connected to at least one exhaust channel (42). The exhaust channel (42) comprises a rotating gate (48) designed to be rotated around an axis substantially perpendicular to the exhaust channel (42) by the passage of switching gases. The rotating gate (48) comprises an edge (54) positioned across from an inner wall (56) of the exhaust channel, in the first obstruction position. The arrangement of the rotating gate (48) and the inner wall (56) is such that the distance between said edge (54) and said inner wall (56) remains constant and equal to said first distance up to a first threshold value of the angle of rotation of the rotating gate (48), then increases linearly up to a second rotation angle threshold value corresponding to complete opening of the discharge channel. The invention also relates to a switching unit comprising at least one single-pole switching unit.