Gas Sensor Filter Seal Design for Moisture Ingress Prevention
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Solution Overview
Problem
Conventional gas sensors face challenges in preventing foreign substances, such as moisture, from entering the gas sensing space, particularly at the coupling portion between the filter and the housing, which can lead to inaccurate hydrogen gas leakage detection.
Innovation Solution
A gas sensor design that includes a housing with a circuit board, a holder, and a filter, where the holder is securely coupled to the housing and the filter is positioned to cover the open portion, using methods like ultrasonic waves, lasers, or heat to ensure an airtight seal and prevent foreign substances from entering the gas sensing space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a filter is coupled to the housing at the open portion, then foreign substances can be filtered, but foreign substances such as moisture can still enter through the coupling portion between the filter and housing
Solution Approach 1:
The filter is divided into a filter body and a separate sealing member (filter seal). The sealing member is specifically designed to contact the inner circumferential surface of the housing at the coupling portion, creating a dedicated sealing structure that prevents moisture and foreign substances from entering through the coupling interface between the filter and housing.
2Stability of the object's composition
If the holder is secured to the housing, then structural stability is improved, but foreign substances can still penetrate into the gas sensing space through gaps
Solution Approach 1:
A holder is introduced as an intermediary component between the filter and the gas sensing space. The holder includes a holder seal that contacts the outer circumferential surface of the filter, creating an additional sealing barrier. This intermediary structure prevents foreign substances from penetrating into the gas sensing space through gaps between the filter and housing while maintaining structural stability.
3Productivity
If the filter covers the through hole, then gas flow is controlled, but foreign substances can enter through the open portion of the housing
Solution Approach 1:
A membrane structure is used as the filter element, which acts as a flexible thin film that covers the through hole in the holder. This membrane allows controlled gas flow through its porous structure while blocking foreign substances and moisture from entering the gas sensing space through the open portion of the housing.
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 foreign substances from penetrating into the gas sensing space, maintaining the integrity of the hydrogen gas detection and reducing the risk of false readings due to moisture or other contaminants.
Implementation Method 1
The holder may be integrally coupled to the support by being fused thereto by ultrasonic waves, lasers, vibration, or heat.
Implementation Method 2
The holder may be integrally coupled to the support by being fused thereto by ultrasonic waves, lasers, vibration, or heat.
Implementation Method 3
An adhesive may be applied on a portion between the holder and the bottom surface in the housing that may be spaced apart from each other, and the holder may be integrally coupled to the housing by the adhesive.
Data Source
AI summary
A gas sensor includes a housing having an open portion at one side of the housing, a circuit board securely provided inside the housing, the circuit board defining a gas sensing space in the housing that communicates with the open portion of the housing, the circuit board having a sensing element located in the gas sensing space and configured to sense a specific gas, a holder provided inside the gas sensing space, and fixed to the housing, the holder having a through hole communicating with the open portion of the housing, and a filter provided inside the gas sensing space, and coupled to the holder or the housing so as to cover the through hole or the open portion.