Gas Sensor Element Inclination for Flow Disruption
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Solution Overview
Problem
Gas sensors have low responsiveness in detecting gas concentrations due to laminar flow of measured gas within the protective cover, which hinders the gas from reaching the sensor element's detecting portion in a timely manner.
Innovation Solution
The sensor element is inclined at an angle of 1° or greater relative to the protective cover's axial direction, disrupting laminar flow and promoting turbulent flow, allowing the gas to reach the detecting portion more effectively, and optionally, a protective layer with uneven thickness is used to further enhance this effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the sensor element is positioned on the axial line of the protective cover, then the structure is simple and easy to manufacture, but the flow of measured gas becomes laminar and responsiveness is reduced
Solution Approach 1:
The sensor element is positioned asymmetrically by inclining it at a specific angle (θ1) relative to the axial direction of the protective cover. This asymmetric positioning disrupts the symmetric laminar flow pattern that would otherwise occur along the axial line, creating turbulent flow that enhances gas mixing and improves responsiveness while maintaining manufacturing simplicity.
Solution Approach 2:
The inclination angle θ1 of the sensor element is optimized within a specific range (10° to 45°) to achieve the desired balance between manufacturing ease and responsiveness. By carefully controlling this geometric parameter, the patent achieves turbulent flow enhancement without excessive structural complexity.
2Speed
If the sensor element is inclined at a large angle, then responsiveness is improved due to disrupted laminar flow, but pressure loss in the element chamber increases
Solution Approach 1:
The inclination angle θ1 is optimized within a specific range (10° to 45°) to achieve the desired balance between responsiveness and pressure loss. Angles smaller than 10° are insufficient to disrupt laminar flow effectively, while angles larger than 45° cause excessive pressure loss. This optimized parameter range ensures turbulent flow enhancement while maintaining acceptable pressure characteristics.
3Measurement precision
If the measured gas flows through the element chamber, then the sensor can detect gas concentration, but the laminar flow causes delayed arrival at the detecting portion
Solution Approach 1:
The asymmetric positioning of the sensor element through inclination creates asymmetric flow patterns that promote turbulent mixing. This turbulence accelerates the transport of measured gas to the detecting portion of the sensor element, reducing response time while maintaining detection accuracy through sufficient gas-sensor contact.
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 design improves the responsiveness of the gas sensor by reducing laminar flow and increasing the speed at which the gas reaches the detecting portion, while maintaining low pressure loss, thus enhancing detection efficiency.
Implementation Method 1
the flow of the measured gas in an inner space of the protective cover having the sensor element therein was laminar
Implementation Method 2
making the flow of the measured gas less likely to be laminar (i.e., more likely to be turbulent)
Data Source
AI summary
A gas sensor 10 includes a tubular protective cover 30 having an element chamber 37 therein and configured to allow a measured gas to flow from the outside into the element chamber 37; and a long sensor element 20 including a detecting portion 23 located in the element chamber 37 and configured to detect a specified gas concentration in the measured gas. An inclination angle θt of an axial direction of the sensor element 20 (i.e., a direction parallel to an element axis A1) in the element chamber 37 with respect to an axial direction of the protective cover 30 (i.e., a direction parallel to a cover axis A2) is 1° or greater.