Gas Sensor Outer Cover Guide for Water Discharge
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Solution Overview
Problem
Conventional gas sensors face issues with water resistance, where water entering through side openings can lead to the gas sensing element getting wet, causing cracks, while attempts to improve water resistance may compromise the sensor's responsiveness.
Innovation Solution
The gas sensor design features side openings with guides that direct water towards the axial tip end side, preventing it from entering the circumferential direction and inner charge ports, ensuring water is discharged without compromising the introduction of measurement gas, thus maintaining responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If side openings are formed with circumferential direction components, then gas flow is improved, but water enters the inner cover causing cracks in the gas sensing element
Solution Approach 1:
The side opening is divided into two functional parts: a gas flow path and a water discharge path. The guide structure segments the opening such that gas can flow through while water is directed away from the inner cover, preventing cracks in the gas sensing element.
Solution Approach 2:
A guide structure acts as an intermediary element within the side opening. This guide directs water flow away from the inner cover while allowing gas to pass through, serving as a mediator between the harmful water flow and the vulnerable gas sensing element.
2Object-affected harmful factors
If inner charge ports are repositioned to prevent water entry, then water resistance is improved, but responsiveness of the gas sensor deteriorates
Solution Approach 1:
The harmful water flow path is extracted and separated from the gas flow path through the guide structure. Water is taken out of the path that would lead to the inner cover, while gas flow remains uninterrupted, thus maintaining responsiveness without compromising water resistance.
Solution Approach 2:
Different parts of the side opening have different functional qualities: the upper part directs water away while the lower part allows gas flow. This local differentiation of function within the same opening structure enables both water resistance and responsiveness to be maintained simultaneously.
3Object-affected harmful factors
If side openings are designed to prevent water flow, then water resistance is improved, but gas introduction is compromised reducing responsiveness
Solution Approach 1:
The guide structure within the side opening is designed to dynamically respond to the flow characteristics of different substances. It allows gas to flow through while directing water away, adapting the flow paths based on the properties of the flowing material to maintain both water resistance and gas introduction efficiency.
Data Source
AI summary
A gas sensor comprises a gas sensing element, a housing for the gas sensing element, and an element cover secured to an axial end of the housing and composed of an inner cover covering part of the gas sensing element and an outer cover disposed outside the inner cover. The outer cover comprise an approximately cylindrical side wall body, a bottom body integral with the side wall body, and a guide having first and second ends, the first end being secured to the side wall body and the second end being separated from the side wall body and located to provide a side opening between the second end and the side wall body. The side opening introduces a gas thereinto. A discharge opening is formed through the bottom body. The second end is recessed inward in the outer cover and is closer to the bottom body than the first end.