Gas Sensor Detecting Element Chamfered Rear End
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Solution Overview
Problem
Existing gas sensors face issues with chipping at the rear end portion of the detecting element during insertion into a tubular separator, especially when inserted at an incline, due to corner portions coming into contact with the separator's opening or inner surface, despite the use of C chamfering to improve insertion performance.
Innovation Solution
A gas sensor design with a plate-shaped detecting element featuring a first chamfered portion between the principal surface and the rear end surface, where the angle between the axis ridgeline and the width ridgeline is set to be larger than 90°, ensuring the width ridgeline is closer to the rear end and smoother, preventing corner contact with the separator's inner surface during non-coaxial insertion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If C chamfering is performed on the rear end portion of the detecting element, then insertion performance into the separator is improved, but chipping still occurs at the corner portion when inserted at an incline
Solution Approach 1:
A protective protrusion is added to the rear end portion of the detecting element before insertion occurs. This protrusion预先 extends beyond the separator's inner surface, acting as a guide that prevents the corner portions from contacting the separator during inclined insertion, thereby preventing chipping before it can happen
Solution Approach 2:
The solution adds a new dimensional element (the protrusion extending in the axial direction) to the rear end portion. This creates a three-dimensional structure that interacts with the separator's opening to guide insertion and protect corner portions, transforming a two-dimensional chamfering problem into a three-dimensional protective structure
2Ease of manufacture
If the detecting element is inserted at an incline with respect to the separator, then manufacturing flexibility is maintained, but corner portions strike the separator causing chipping
Solution Approach 1:
The protrusion is预先 formed on the detecting element before insertion. During inclined insertion, this protrusion makes contact with the separator's inner surface first, guiding the insertion process and preventing corner portions from striking the separator, thus maintaining both manufacturing flexibility and precision
3Strength
If the corner portion is designed with sharp ridgelines, then structural integrity is maintained, but susceptibility to chipping during insertion increases
Solution Approach 1:
The protrusion acts as a cushioning element that prevents direct contact between the corner portions and the separator during insertion. By intercepting the potential impact before it reaches the corner portions, the protrusion protects the structurally integral but chipping-susceptible corners
Data Source
AI summary
A gas sensor including a plate-shaped detecting element is disclosed, wherein the detecting element has a pair of principle surfaces and a pair of side surfaces adjacent to the pair of principle surfaces, in a radical direction thereof, wherein a first chamfered portion is provided between at least one first principal surface of the pair of principal surfaces and the rear end surface of the detecting element, and wherein the angle between a first axis ridgeline portion formed by the first principal surface and a first side surface that is one of the pair of side surfaces and extending in the direction of the axis, and a first width ridgeline formed by the first principal surface and the first chamfered portion and extending in a width direction is larger than 90°.