Electrical Feedthrough Touch Protection Against Short Circuits
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Solution Overview
Problem
Existing electrical feedthroughs for heating elements in exhaust gas guiding devices face challenges with permanent electrical connections, mechanical loads, thermal loads, corrosive influences, and exposure to dust, dirt, water, and corrosive media, which can lead to short circuits and destruction of electrical insulation.
Innovation Solution
The electrical feedthrough incorporates a touch protection and fluid protection mechanism, where the electrical conductor is encased in a ceramic insulating sleeve within a metal sleeve, and the outer region is enclosed by a touch protection, such as a collar or lid-like cover, to prevent mechanical damage and fluid exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the electrical conductor is exposed outside the housing for electrical connection, then ease of operation is improved, but reliability deteriorates due to exposure to dust, dirt, water and corrosive media
Solution Approach 1:
A touch protection element is introduced as an intermediary component between the electrical conductor and the external environment. This element provides electrical insulation and prevents direct contact with conductive media while allowing electrical connection to be made, thus resolving the contradiction between ease of operation and reliability
Solution Approach 2:
The touch protection element is pre-installed on the electrical conductor before it exits the housing, creating a preliminary protective barrier against dust, dirt, water and corrosive media. This preliminary protection prevents contamination and short circuits while maintaining electrical connectivity
2Strength
If robust materials are used for mechanical strength, then strength is improved, but reliability deteriorates due to electrochemical corrosion
Solution Approach 1:
The touch protection element is made from composite or specially selected materials that combine high mechanical strength with excellent resistance to electrochemical corrosion. This material selection allows the component to withstand both mechanical loads and corrosive environments without degrading, resolving the contradiction between strength and corrosion resistance
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
This solution effectively prevents unwanted short circuits and leakage currents, protects the electrical insulation from damage, and ensures reliable electrical connections despite exposure to harsh environmental conditions.
Implementation Method 1
The electrical conductor (4) is electrically insulated with respect to the housing (2)
Implementation Method 2
heating takes place using ohmic resistance, whereby an electric current is converted into heat in a conductive structure
Data Source
AI summary
An electrical feedthrough for electrically contacting a heat conductor in an exhaust gas guiding device for heating an exhaust gas flow. The heat conductor is located in a housing and at least one electrical conductor designed as a bolt is guided through an opening in the housing and is electrically conductively connected to the heat conductor. The electrical conductor is electrically insulated with respect to the housing and is permanently connected to the housing by a socket. The portion of the electrical conductor outside the housing is enclosed by a touch protection.