Reinforced Rotating Element for Low-Voltage Switches

Solution Overview

Problem

Existing low-voltage switches face limitations in electrodynamic strength and breaking power due to the mechanical stresses on rotating elements, which are compromised by the use of insulating materials, leading to inefficiencies and increased costs when attempting to enhance mechanical resistance.

Innovation Solution

Incorporation of strategically positioned reinforcement elements within the rotating element's seats to distribute and absorb stresses, enhancing the rigidity and performance of the switch while maintaining electrical insulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If metal reinforcement bars are introduced to increase mechanical resistance, then the mechanical strength of the rotating element is improved, but the electrical insulation between poles is compromised and manufacturing complexity increases

Engineering Contradiction:

Improvemechanical resistanceVSAvoidelectrical insulation

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent applies local quality by positioning reinforcement elements specifically in high-stress zones of the rotating element (such as contact seats and connection points) rather than throughout the entire structure. This localized reinforcement maintains electrical insulation in non-critical areas while providing mechanical strength where needed, resolving the contradiction between mechanical resistance and electrical insulation.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent employs composite construction by combining insulating material (such as molded plastic or ceramic) with strategically placed reinforcement elements (metal inserts or fibers). This composite approach allows the rotating element to simultaneously achieve both electrical insulation from the base material and mechanical strength from the reinforcement elements, directly resolving the contradiction between these two requirements.

Inventive Principle:

Principle #40Composite materials

2Strength

If the radial dimensions of the rotating element are increased to improve mechanical characteristics, then the mechanical strength is enhanced, but friction increases and overall efficiency deteriorates

Engineering Contradiction:

Improvemechanical characteristicsVSAvoidfriction

Core Design Contradiction:

StrengthVSLoss of energy

Solution Approach 1:

The patent applies local quality by concentrating reinforcement only in specific high-stress areas of the rotating element rather than increasing its overall radial dimensions. This localized strengthening maintains the element's compact size and minimal contact surface area, thereby preserving low friction characteristics while still achieving the required mechanical strength in critical zones.

Inventive Principle:

Principle #3Local quality

3Reliability

If strong contact springs are used to improve electrodynamic strength, then the electrodynamic performance is enhanced, but the mechanical stresses on the rotating element increase beyond the elastic behavior region

Engineering Contradiction:

Improveelectrodynamic strengthVSAvoidmechanical stress resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent employs composite construction by combining insulating material (such as molded plastic or ceramic) with strategically placed reinforcement elements (metal inserts or fibers). This composite approach allows the rotating element to simultaneously achieve both electrical insulation from the base material and mechanical strength from the reinforcement elements, directly resolving the contradiction between these two requirements.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent applies local quality by positioning reinforcement elements specifically in high-stress zones of the rotating element (such as contact seats and connection points) rather than throughout the entire structure. This localized reinforcement maintains electrical insulation in non-critical areas while providing mechanical strength where needed, resolving the contradiction between mechanical resistance and electrical insulation.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP1912239B1Low-voltage device with reinforced rotating element

Publication Date: 2012.08.08 ABB SPA

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AI summary

A single-pole or multi-pole device (1) for low-voltage systems, in particular a circuit breaker or a disconnector, which comprises: an outer casing (2,2') containing for each pole at least one fixed contact and at least one mobile contact (3) that can be coupled to/uncoupled from one another; a rotating element (4), defined by a shaped body (5) comprising at least one seat (6) for each pole of said switch, said seat being designed to house at least one mobile contact of a corresponding pole; a control mechanism (7) operatively connected to said rotating element for enabling movement thereof; reinforcement elements (10,20,30,40,50) positioned in said at least one seat of said mobile contact.