Flame-Arrested Gas Sensor Housing for Hydrogen Leak Detection
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Solution Overview
Problem
The challenge in the field of electromobility is the safe and reliable detection of hydrogen gas leaks from hydrogen storage tanks and fuel cell systems, as hydrogen reacts exothermally with oxygen, posing a risk of explosion, and existing gas sensors may generate heat that could spread and exacerbate the risk.
Innovation Solution
A gas sensor design incorporating a sensor element, encapsulation, and a flame arrester, which includes features like through-holes in substrates or covers, leadframes, and flame-retardant layers to prevent the spread of flames and ensure safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas sensors are used for hydrogen detection, then detection capability is improved, but heat generated by the sensor may spread and exacerbate explosion risk
Solution Approach 1:
A flame arrester is introduced as an intermediary component between the sensor element and the external environment. This flame arrester contains a flame-retardant layer that acts as a mediator to block the transmission of flames and heat waves while allowing gas molecules to pass through for detection, thus protecting the sensor element from thermal damage without compromising detection capability
Solution Approach 2:
The encapsulation structure is designed with spatially differentiated properties: the flame-retardant layer is specifically positioned at the opening facing potential ignition sources, while other regions maintain thermal insulation properties. This localized flame retardant treatment provides targeted protection exactly where heat spread is most dangerous, without affecting the sensor's detection function
2Reliability
If encapsulation with opening is provided for gas detection, then gas access to sensor element is improved, but flame propagation path is created
Solution Approach 1:
The flame-retardant layer in the flame arrester is designed with a porous or mesh-like structure that allows gas molecules to diffuse through for sensor detection while the interconnected pores create tortuous paths that quench flames. The porous structure enables selective permeability: small gas molecules pass freely while larger flame fronts are blocked by the complex pore geometry and heat absorption in the pore walls
Solution Approach 2:
The flame-retardant layer serves as an intermediary barrier in the gas pathway. It is positioned between the external environment and the sensor element, allowing hydrogen gas to reach the sensor for detection while simultaneously acting as a flame propagation blocker that prevents external flames from reaching the sensor through the same pathway
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 design effectively prevents the propagation of explosion waves, ensuring safe operation and compliance with safety standards by preventing further damage or injury.
Implementation Method 1
a flame arrester, which is arranged in the opening of the encapsulation... effectively prevents the propagation of explosion waves
Implementation Method 2
sensor element for the detection of a gas... can for example determine the partial pressure of the hydrogen in a water/hydrogen mixture
Data Source
AI summary
A gas sensor comprises a sensor element for the detection of a gas, an encapsulation, which surrounds the sensor element and has an opening for a gas to be detected to pass through to the sensor element, and a flame arrester, which is arranged in the opening of the encapsulation.