Vacuum Interrupter Dampener Assembly for Contact Bounce Control

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Solution Overview

Problem

Existing vacuum interrupters experience contact bounce during closure, leading to arcing and welding between movable and fixed contacts, which complicates opening and may prevent complete separation, due to limited dampening by compliance springs in magnetic actuators.

Innovation Solution

An anti-bounce dampener assembly with a dampening spring, guide tube, and flexible strap is integrated within the vacuum interrupter, dampening the impact force by moving the fixed contact stem and vacuum interrupter components against the spring bias, maintaining electrical coupling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a compliance spring is used in the magnetic actuator to provide opening force, then the vacuum interrupter can be opened reliably, but the dampening capability against contact bounce is insufficient

Engineering Contradiction:

Improveopening reliabilityVSAvoidcontact bounce

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The dampening function is separated from the opening spring function. A dedicated dampener assembly with a dampening spring is integrated into the fixed contact stem, while the compliance spring in the actuator maintains its opening force function. This segmentation allows each component to optimize its specific function without compromise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The dampener assembly acts as an intermediary between the movable contact impact and the fixed contact stem. The dampening spring absorbs impact energy through controlled compression, mediating the force transmission and reducing contact bounce before it affects the interrupter operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Force

If the movable contact impacts the fixed contact with high speed during closure, then the closing force is sufficient, but contact bounce occurs causing arcing and welding

Engineering Contradiction:

Improveclosing forceVSAvoidarcing and welding

Core Design Contradiction:

ForceVSObject-generated harmful factors

Solution Approach 1:

The dampening spring is pre-installed in the dampener assembly, ready to cushion the impact before it occurs. When the movable contact closes and impacts the fixed contact, the spring immediately compresses to absorb the shock, preventing the harmful bounce that would otherwise cause arcing and welding.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The impact energy that would normally cause harmful bounce is converted into useful spring compression. The dampening spring transforms the kinetic energy of the closing contact into elastic potential energy, dissipating it harmlessly and preventing contact bounce while maintaining effective closing force.

Inventive Principle:

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

3Stability of the object's composition

If the fixed contact stem is rigidly fixed to prevent movement, then structural stability is maintained, but impact force cannot be dampened

Engineering Contradiction:

Improvestructural stabilityVSAvoidimpact force

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The fixed contact stem is transformed from a completely rigid structure to a dynamically responsive one. The dampener assembly allows the stem to move slightly under impact, with the dampening spring providing controlled compliance. This dynamic behavior enables impact dampening while maintaining overall structural stability through the guide tube and mounting structure.

Inventive Principle:

Principle #15Dynamics

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

Reduces contact bounce and stabilizes the vacuum interrupter, preventing arcing and ensuring reliable opening, even under high impact forces.

Implementation Method 1

A preloaded dampener spring is positioned within a bore in the contact adapter and is pressed against an end of the strap

Methodology Applied

Scientific EffectSpring: Spring

Implementation Method 2

An anti-bounce dampener assembly with a dampening spring, guide tube, and flexible strap is integrated within the vacuum interrupter, dampening the impact force

Methodology Applied

Scientific EffectDamping: Damping

Implementation Method 3

A flexible conductive strap has one end positioned between the guide tube and the shaft portion of the stem and an opposite end positioned between the housing and the contact adapter so as to provide a current path between the stem and the contact adapter

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12381052B2Vacuum interrupter anti-bounce dampener

Publication Date: 2025.08.05 S&C ELECTRIC CO

AI summary

An anti-bounce dampener assembly for dampening the closing impact force between vacuum interrupter contacts. The dampener assembly includes a dampening spring positioned within a contact adapter, a guide tube extending through the contact adapter and the spring, where the guide tube is coupled to a fixed contact stem, and a bolt extending through the guide tube and being rigidly secured to the fixed contact stem. An impact force caused when the vacuum interrupter contacts contact each other when the vacuum interrupter is closed causes the fixed contact stem, the guide tube, the bolt and the vacuum interrupter to move against the bias of the spring and dampen the impact force. A flexible strap is electrically coupled to the fixed contact stem and the contact adapter, and flexes when the stem moves so as to maintain electrical coupling between the fixed contact stem and the contact adapter.